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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
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  {
243  /* *INDENT-OFF* */
244  next0 = (error0 == IP_FRAG_ERROR_NONE) ? vnet_buffer (p0)->
245  ip_frag.next_index : IP4_FRAG_NEXT_DROP;
246  /* *INDENT-ON* */
247  }
248 
249  if (error0 == IP_FRAG_ERROR_NONE)
250  {
251  frag_sent += vec_len (buffer);
252  small_packets += (vec_len (buffer) == 1);
253  }
254  else
255  vlib_error_count (vm, ip4_frag_node.index, error0, 1);
256 
257  //Send fragments that were added in the frame
258  frag_from = buffer;
259  frag_left = vec_len (buffer);
260 
261  while (frag_left > 0)
262  {
263  while (frag_left > 0 && n_left_to_next > 0)
264  {
265  u32 i;
266  i = to_next[0] = frag_from[0];
267  frag_from += 1;
268  frag_left -= 1;
269  to_next += 1;
270  n_left_to_next -= 1;
271 
272  vlib_get_buffer (vm, i)->error = error_node->errors[error0];
273  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
274  to_next, n_left_to_next, i,
275  next0);
276  }
277  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
278  vlib_get_next_frame (vm, node, next_index, to_next,
279  n_left_to_next);
280  }
281  vec_reset_length (buffer);
282  }
283  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
284  }
285  vec_free (buffer);
286 
288  IP_FRAG_ERROR_FRAGMENT_SENT, frag_sent);
290  IP_FRAG_ERROR_SMALL_PACKET, small_packets);
291 
292  return frame->n_vectors;
293 }
294 
295 
296 static void
298  ip_frag_error_t * error)
299 {
300  vlib_buffer_t *p;
301  ip6_header_t *ip6_hdr;
302  ip6_frag_hdr_t *frag_hdr;
303  u8 *payload, *next_header;
304 
305  p = vlib_get_buffer (vm, pi);
306 
307  //Parsing the IPv6 headers
308  ip6_hdr =
309  vlib_buffer_get_current (p) + vnet_buffer (p)->ip_frag.header_offset;
310  payload = (u8 *) (ip6_hdr + 1);
311  next_header = &ip6_hdr->protocol;
312  if (*next_header == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
313  {
314  next_header = payload;
315  payload += payload[1] * 8;
316  }
317 
318  if (*next_header == IP_PROTOCOL_IP6_DESTINATION_OPTIONS)
319  {
320  next_header = payload;
321  payload += payload[1] * 8;
322  }
323 
324  if (*next_header == IP_PROTOCOL_IPV6_ROUTE)
325  {
326  next_header = payload;
327  payload += payload[1] * 8;
328  }
329 
330  if (PREDICT_FALSE
331  (payload >= (u8 *) vlib_buffer_get_current (p) + p->current_length))
332  {
333  //A malicious packet could set an extension header with a too big size
334  //and make us modify another vlib_buffer
335  *error = IP_FRAG_ERROR_MALFORMED;
336  return;
337  }
338 
339  u8 has_more;
340  u16 initial_offset;
341  if (*next_header == IP_PROTOCOL_IPV6_FRAGMENTATION)
342  {
343  //The fragmentation header is already there
344  frag_hdr = (ip6_frag_hdr_t *) payload;
345  has_more = ip6_frag_hdr_more (frag_hdr);
346  initial_offset = ip6_frag_hdr_offset (frag_hdr);
347  }
348  else
349  {
350  //Insert a fragmentation header in the packet
351  u8 nh = *next_header;
352  *next_header = IP_PROTOCOL_IPV6_FRAGMENTATION;
353  vlib_buffer_advance (p, -sizeof (*frag_hdr));
354  u8 *start = vlib_buffer_get_current (p);
355  memmove (start, start + sizeof (*frag_hdr),
356  payload - (start + sizeof (*frag_hdr)));
357  frag_hdr = (ip6_frag_hdr_t *) (payload - sizeof (*frag_hdr));
358  frag_hdr->identification = ++running_fragment_id;
359  frag_hdr->next_hdr = nh;
360  frag_hdr->rsv = 0;
361  has_more = 0;
362  initial_offset = 0;
363  }
364  payload = (u8 *) (frag_hdr + 1);
365 
366  u16 headers_len = payload - (u8 *) vlib_buffer_get_current (p);
367  u16 max_payload = vnet_buffer (p)->ip_frag.mtu - headers_len;
368  u16 rem = p->current_length - headers_len;
369  u16 ptr = 0;
370 
371  if (max_payload < 8)
372  {
373  *error = IP_FRAG_ERROR_CANT_FRAGMENT_HEADER;
374  return;
375  }
376 
377  while (rem)
378  {
379  u32 bi;
380  vlib_buffer_t *b;
381  u16 len = (rem > max_payload) ? (max_payload & ~0x7) : rem;
382  rem -= len;
383 
384  if (ptr != 0)
385  {
386  if (!vlib_buffer_alloc (vm, &bi, 1))
387  {
388  *error = IP_FRAG_ERROR_MEMORY;
389  return;
390  }
391  b = vlib_get_buffer (vm, bi);
392  vnet_buffer (b)->sw_if_index[VLIB_RX] =
393  vnet_buffer (p)->sw_if_index[VLIB_RX];
394  vnet_buffer (b)->sw_if_index[VLIB_TX] =
395  vnet_buffer (p)->sw_if_index[VLIB_TX];
397  vlib_buffer_get_current (p), headers_len);
398  clib_memcpy (vlib_buffer_get_current (b) + headers_len,
399  payload + ptr, len);
400  frag_hdr =
401  vlib_buffer_get_current (b) + headers_len - sizeof (*frag_hdr);
402  }
403  else
404  {
405  bi = pi;
406  b = vlib_get_buffer (vm, bi);
407  //frag_hdr already set here
408  }
409 
410  ip6_hdr =
411  vlib_buffer_get_current (b) + vnet_buffer (p)->ip_frag.header_offset;
412  frag_hdr->fragment_offset_and_more =
413  ip6_frag_hdr_offset_and_more (initial_offset + (ptr >> 3),
414  (rem || has_more));
415  b->current_length = headers_len + len;
416  ip6_hdr->payload_length =
417  clib_host_to_net_u16 (b->current_length -
418  vnet_buffer (p)->ip_frag.header_offset -
419  sizeof (*ip6_hdr));
420 
421  if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP4_HEADER)
422  {
423  //Encapsulating ipv4 header
424  ip4_header_t *encap_header4 =
426  encap_header4->length = clib_host_to_net_u16 (b->current_length);
427  encap_header4->checksum = ip4_header_checksum (encap_header4);
428  }
429  else if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP6_HEADER)
430  {
431  //Encapsulating ipv6 header
432  ip6_header_t *encap_header6 =
434  encap_header6->payload_length =
435  clib_host_to_net_u16 (b->current_length -
436  sizeof (*encap_header6));
437  }
438 
439  vec_add1 (*buffer, bi);
440 
441  ptr += len;
442  }
443 }
444 
445 static uword
447 {
448  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
449  vlib_node_runtime_t *error_node =
451  from = vlib_frame_vector_args (frame);
452  n_left_from = frame->n_vectors;
453  next_index = node->cached_next_index;
454  u32 frag_sent = 0, small_packets = 0;
455  u32 *buffer = 0;
456 
457  while (n_left_from > 0)
458  {
459  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
460 
461  while (n_left_from > 0 && n_left_to_next > 0)
462  {
463  u32 pi0, *frag_from, frag_left;
464  vlib_buffer_t *p0;
465  ip_frag_error_t error0;
466  ip6_frag_next_t next0;
467 
468  pi0 = from[0];
469  from += 1;
470  n_left_from -= 1;
471  error0 = IP_FRAG_ERROR_NONE;
472 
473  p0 = vlib_get_buffer (vm, pi0);
474  ip6_frag_do_fragment (vm, pi0, &buffer, &error0);
475 
477  {
478  ip_frag_trace_t *tr =
479  vlib_add_trace (vm, node, p0, sizeof (*tr));
480  tr->header_offset = vnet_buffer (p0)->ip_frag.header_offset;
481  tr->mtu = vnet_buffer (p0)->ip_frag.mtu;
482  tr->ipv6 = 1;
483  tr->n_fragments = vec_len (buffer);
484  tr->next = vnet_buffer (p0)->ip_frag.next_index;
485  }
486 
487  /* *INDENT-OFF* */
488  next0 = (error0 == IP_FRAG_ERROR_NONE) ? vnet_buffer (p0)->
489  ip_frag.next_index : IP6_FRAG_NEXT_DROP;
490  /* *INDENT-ON* */
491 
492  frag_sent += vec_len (buffer);
493  small_packets += (vec_len (buffer) == 1);
494 
495  //Send fragments that were added in the frame
496  frag_from = buffer;
497  frag_left = vec_len (buffer);
498  while (frag_left > 0)
499  {
500  while (frag_left > 0 && n_left_to_next > 0)
501  {
502  u32 i;
503  i = to_next[0] = frag_from[0];
504  frag_from += 1;
505  frag_left -= 1;
506  to_next += 1;
507  n_left_to_next -= 1;
508 
509  vlib_get_buffer (vm, i)->error = error_node->errors[error0];
510  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
511  to_next, n_left_to_next, i,
512  next0);
513  }
514  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
515  vlib_get_next_frame (vm, node, next_index, to_next,
516  n_left_to_next);
517  }
518  vec_reset_length (buffer);
519  }
520  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
521  }
522  vec_free (buffer);
524  IP_FRAG_ERROR_FRAGMENT_SENT, frag_sent);
526  IP_FRAG_ERROR_SMALL_PACKET, small_packets);
527 
528  return frame->n_vectors;
529 }
530 
531 static char *ip4_frag_error_strings[] = {
532 #define _(sym,string) string,
534 #undef _
535 };
536 
537 /* *INDENT-OFF* */
539  .function = ip4_frag,
540  .name = IP4_FRAG_NODE_NAME,
541  .vector_size = sizeof (u32),
542  .format_trace = format_ip_frag_trace,
543  .type = VLIB_NODE_TYPE_INTERNAL,
544 
545  .n_errors = IP_FRAG_N_ERROR,
546  .error_strings = ip4_frag_error_strings,
547 
548  .n_next_nodes = IP4_FRAG_N_NEXT,
549  .next_nodes = {
550  [IP4_FRAG_NEXT_IP4_LOOKUP] = "ip4-lookup",
551  [IP4_FRAG_NEXT_IP6_LOOKUP] = "ip6-lookup",
552  [IP4_FRAG_NEXT_ICMP_ERROR] = "ip4-icmp-error",
553  [IP4_FRAG_NEXT_DROP] = "ip4-drop"
554  },
555 };
556 /* *INDENT-ON* */
557 
558 /* *INDENT-OFF* */
560  .function = ip6_frag,
561  .name = IP6_FRAG_NODE_NAME,
562  .vector_size = sizeof (u32),
563  .format_trace = format_ip_frag_trace,
564  .type = VLIB_NODE_TYPE_INTERNAL,
565 
566  .n_errors = IP_FRAG_N_ERROR,
567  .error_strings = ip4_frag_error_strings,
568 
569  .n_next_nodes = IP6_FRAG_N_NEXT,
570  .next_nodes = {
571  [IP6_FRAG_NEXT_IP4_LOOKUP] = "ip4-lookup",
572  [IP6_FRAG_NEXT_IP6_LOOKUP] = "ip6-lookup",
573  [IP6_FRAG_NEXT_DROP] = "ip6-drop"
574  },
575 };
576 /* *INDENT-ON* */
577 
578 /*
579  * fd.io coding-style-patch-verification: ON
580  *
581  * Local Variables:
582  * eval: (c-set-style "gnu")
583  * End:
584  */
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:337
#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
#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:57
#define vec_add1(V, E)
Add 1 element to end of vector (unspecified alignment).
Definition: vec.h:518
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
u16 flags_and_fragment_offset
Definition: ip4_packet.h:145
u16 n_fragments
Definition: ip_frag.c:33
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:415
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:297
static int ip4_get_fragment_offset(ip4_header_t *i)
Definition: ip4_packet.h:192
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:205
#define ip6_frag_hdr_more(hdr)
Definition: ip6_packet.h:522
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:72
#define IP4_FRAG_NODE_NAME
Definition: ip_frag.h:43
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
#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
vlib_node_registration_t ip6_frag_node
(constructor) VLIB_REGISTER_NODE (ip6_frag_node)
Definition: ip_frag.c:559
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:113
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1158
#define IP4_HEADER_FLAG_MORE_FRAGMENTS
Definition: ip4_packet.h:146
u16 n_vectors
Definition: node.h:344
vlib_main_t * vm
Definition: buffer.c:283
ip_frag_error_t
Definition: ip_frag.h:77
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:336
void icmp4_error_set_vnet_buffer(vlib_buffer_t *b, u8 type, u8 code, u32 data)
Definition: icmp4.c:431
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:93
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:89
#define clib_memcpy(a, b, c)
Definition: string.h:75
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
#define ip6_frag_hdr_offset(hdr)
Definition: ip6_packet.h:519
#define IP_FRAG_FLAG_IP6_HEADER
Definition: ip_frag.h:41
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:456
unsigned int u32
Definition: types.h:88
#define IP_FRAG_FLAG_IP4_HEADER
Definition: ip_frag.h:40
u16 header_offset
Definition: ip_frag.c:30
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:208
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:332
vlib_node_registration_t ip4_frag_node
(constructor) VLIB_REGISTER_NODE (ip4_frag_node)
Definition: ip_frag.c:538
#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:531
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
struct clib_bihash_value offset
template key/value backing page structure
#define vnet_buffer(b)
Definition: buffer.h:326
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
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:159
static uword ip6_frag(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip_frag.c:446
ip6_frag_next_t
Definition: ip_frag.h:58
#define IP4_HEADER_FLAG_DONT_FRAGMENT
Definition: ip4_packet.h:147
#define ip6_frag_hdr_offset_and_more(offset, more)
Definition: ip6_packet.h:525
u32 flags
Definition: vhost-user.h:77
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
static u32 vlib_buffer_alloc(vlib_main_t *vm, u32 *buffers, u32 n_buffers)
Allocate buffers into supplied array.
Definition: buffer_funcs.h:341
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:239
ip4_frag_next_t
Definition: ip_frag.h:49
Definition: defs.h:46