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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 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 (p->flags & VLIB_BUFFER_NEXT_PRESENT)
89  {
90  *error = IP_FRAG_ERROR_MALFORMED;
91  return;
92  }
93 
94  if (ip4_is_fragment (ip4))
95  {
96  ip_frag_id = ip4->fragment_id;
97  ip_frag_offset = ip4_get_fragment_offset (ip4);
98  more =
99  !(!(ip4->flags_and_fragment_offset &
100  clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS)));
101  }
102  else
103  {
104  ip_frag_id = (++running_fragment_id);
105  ip_frag_offset = 0;
106  more = 0;
107  }
108 
109  //Do the actual fragmentation
110  while (rem)
111  {
112  u32 bi;
113  vlib_buffer_t *b;
114  ip4_header_t *fip4;
115 
116  len =
117  (rem >
118  (mtu - sizeof (*ip4) -
119  vnet_buffer (p)->ip_frag.header_offset)) ? max : rem;
120 
121  if (ptr == 0)
122  {
123  bi = pi;
124  b = p;
125  fip4 = (ip4_header_t *) (vlib_buffer_get_current (b) + offset);
126  }
127  else
128  {
129  if (!vlib_buffer_alloc (vm, &bi, 1))
130  {
131  *error = IP_FRAG_ERROR_MEMORY;
132  return;
133  }
134  vec_add1 (*buffer, bi);
135  b = vlib_get_buffer (vm, bi);
136  vnet_buffer (b)->sw_if_index[VLIB_RX] =
137  vnet_buffer (p)->sw_if_index[VLIB_RX];
138  vnet_buffer (b)->sw_if_index[VLIB_TX] =
139  vnet_buffer (p)->sw_if_index[VLIB_TX];
140  /* Copy Adj_index in case DPO based node is sending for the fragmentation,
141  the packet would be sent back to the proper DPO next node and Index */
142  vnet_buffer (b)->ip.adj_index[VLIB_RX] =
143  vnet_buffer (p)->ip.adj_index[VLIB_RX];
144  vnet_buffer (b)->ip.adj_index[VLIB_TX] =
145  vnet_buffer (p)->ip.adj_index[VLIB_TX];
146  fip4 = (ip4_header_t *) (vlib_buffer_get_current (b) + offset);
147 
148  //Copy offset and ip4 header
149  clib_memcpy (b->data, packet, offset + sizeof (*ip4));
150  //Copy data
151  clib_memcpy (((u8 *) (fip4)) + sizeof (*fip4),
152  packet + offset + sizeof (*fip4) + ptr, len);
153  }
154  b->current_length = offset + len + sizeof (*fip4);
155 
156  fip4->fragment_id = ip_frag_id;
158  clib_host_to_net_u16 ((ptr >> 3) + ip_frag_offset);
160  clib_host_to_net_u16 (((len != rem) || more) << 13);
161  // ((len0 != rem0) || more0) << 13 is optimization for
162  // ((len0 != rem0) || more0) ? IP4_HEADER_FLAG_MORE_FRAGMENTS : 0
163  fip4->length = clib_host_to_net_u16 (len + sizeof (*fip4));
164  fip4->checksum = ip4_header_checksum (fip4);
165 
166  if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP4_HEADER)
167  {
168  //Encapsulating ipv4 header
169  ip4_header_t *encap_header4 =
171  encap_header4->length = clib_host_to_net_u16 (b->current_length);
172  encap_header4->checksum = ip4_header_checksum (encap_header4);
173  }
174  else if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP6_HEADER)
175  {
176  //Encapsulating ipv6 header
177  ip6_header_t *encap_header6 =
179  encap_header6->payload_length =
180  clib_host_to_net_u16 (b->current_length -
181  sizeof (*encap_header6));
182  }
183 
184  rem -= len;
185  ptr += len;
186  }
187 }
188 
189 void
191  u8 next_index, u8 flags)
192 {
193  vnet_buffer (b)->ip_frag.header_offset = offset;
194  vnet_buffer (b)->ip_frag.mtu = mtu;
195  vnet_buffer (b)->ip_frag.next_index = next_index;
196  vnet_buffer (b)->ip_frag.flags = flags;
197 }
198 
199 static uword
201 {
202  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
203  vlib_node_runtime_t *error_node =
205  from = vlib_frame_vector_args (frame);
206  n_left_from = frame->n_vectors;
207  next_index = node->cached_next_index;
208  u32 frag_sent = 0, small_packets = 0;
209  u32 *buffer = 0;
210 
211  while (n_left_from > 0)
212  {
213  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
214 
215  while (n_left_from > 0 && n_left_to_next > 0)
216  {
217  u32 pi0, *frag_from, frag_left;
218  vlib_buffer_t *p0;
219  ip_frag_error_t error0;
220  ip4_frag_next_t next0;
221 
222  //Note: The packet is not enqueued now.
223  //It is instead put in a vector where other fragments
224  //will be put as well.
225  pi0 = from[0];
226  from += 1;
227  n_left_from -= 1;
228  error0 = IP_FRAG_ERROR_NONE;
229 
230  p0 = vlib_get_buffer (vm, pi0);
231  ip4_frag_do_fragment (vm, pi0, &buffer, &error0);
232 
233  if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
234  {
235  ip_frag_trace_t *tr =
236  vlib_add_trace (vm, node, p0, sizeof (*tr));
237  tr->header_offset = vnet_buffer (p0)->ip_frag.header_offset;
238  tr->mtu = vnet_buffer (p0)->ip_frag.mtu;
239  tr->ipv6 = 0;
240  tr->n_fragments = vec_len (buffer);
241  tr->next = vnet_buffer (p0)->ip_frag.next_index;
242  }
243 
244  if (error0 == IP_FRAG_ERROR_DONT_FRAGMENT_SET)
245  {
246  icmp4_error_set_vnet_buffer (p0, ICMP4_destination_unreachable,
247  ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
248  vnet_buffer (p0)->ip_frag.mtu);
250  vnet_buffer (p0)->ip_frag.header_offset);
251  next0 = IP4_FRAG_NEXT_ICMP_ERROR;
252  }
253  else
254  {
255  /* *INDENT-OFF* */
256  next0 = (error0 == IP_FRAG_ERROR_NONE) ? vnet_buffer (p0)->
257  ip_frag.next_index : IP4_FRAG_NEXT_DROP;
258  /* *INDENT-ON* */
259  }
260 
261  if (error0 == IP_FRAG_ERROR_NONE)
262  {
263  frag_sent += vec_len (buffer);
264  small_packets += (vec_len (buffer) == 1);
265  }
266  else
267  vlib_error_count (vm, ip4_frag_node.index, error0, 1);
268 
269  //Send fragments that were added in the frame
270  frag_from = buffer;
271  frag_left = vec_len (buffer);
272 
273  while (frag_left > 0)
274  {
275  while (frag_left > 0 && n_left_to_next > 0)
276  {
277  u32 i;
278  i = to_next[0] = frag_from[0];
279  frag_from += 1;
280  frag_left -= 1;
281  to_next += 1;
282  n_left_to_next -= 1;
283 
284  vlib_get_buffer (vm, i)->error = error_node->errors[error0];
285  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
286  to_next, n_left_to_next, i,
287  next0);
288  }
289  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
290  vlib_get_next_frame (vm, node, next_index, to_next,
291  n_left_to_next);
292  }
293  vec_reset_length (buffer);
294  }
295  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
296  }
297  vec_free (buffer);
298 
300  IP_FRAG_ERROR_FRAGMENT_SENT, frag_sent);
302  IP_FRAG_ERROR_SMALL_PACKET, small_packets);
303 
304  return frame->n_vectors;
305 }
306 
307 
308 void
310  ip_frag_error_t * error)
311 {
312  vlib_buffer_t *p;
313  ip6_header_t *ip6_hdr;
314  ip6_frag_hdr_t *frag_hdr;
315  u8 *payload, *next_header;
316 
317  p = vlib_get_buffer (vm, pi);
318 
319  //Parsing the IPv6 headers
320  ip6_hdr =
321  vlib_buffer_get_current (p) + vnet_buffer (p)->ip_frag.header_offset;
322  payload = (u8 *) (ip6_hdr + 1);
323  next_header = &ip6_hdr->protocol;
324  if (*next_header == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
325  {
326  next_header = payload;
327  payload += payload[1] * 8;
328  }
329 
330  if (*next_header == IP_PROTOCOL_IP6_DESTINATION_OPTIONS)
331  {
332  next_header = payload;
333  payload += payload[1] * 8;
334  }
335 
336  if (*next_header == IP_PROTOCOL_IPV6_ROUTE)
337  {
338  next_header = payload;
339  payload += payload[1] * 8;
340  }
341 
342  if (PREDICT_FALSE
343  (payload >= (u8 *) vlib_buffer_get_current (p) + p->current_length))
344  {
345  //A malicious packet could set an extension header with a too big size
346  //and make us modify another vlib_buffer
347  *error = IP_FRAG_ERROR_MALFORMED;
348  return;
349  }
350 
351  if (p->flags & VLIB_BUFFER_NEXT_PRESENT)
352  {
353  *error = IP_FRAG_ERROR_MALFORMED;
354  return;
355  }
356 
357  u8 has_more;
358  u16 initial_offset;
359  if (*next_header == IP_PROTOCOL_IPV6_FRAGMENTATION)
360  {
361  //The fragmentation header is already there
362  frag_hdr = (ip6_frag_hdr_t *) payload;
363  has_more = ip6_frag_hdr_more (frag_hdr);
364  initial_offset = ip6_frag_hdr_offset (frag_hdr);
365  }
366  else
367  {
368  //Insert a fragmentation header in the packet
369  u8 nh = *next_header;
370  *next_header = IP_PROTOCOL_IPV6_FRAGMENTATION;
371  vlib_buffer_advance (p, -sizeof (*frag_hdr));
372  u8 *start = vlib_buffer_get_current (p);
373  memmove (start, start + sizeof (*frag_hdr),
374  payload - (start + sizeof (*frag_hdr)));
375  frag_hdr = (ip6_frag_hdr_t *) (payload - sizeof (*frag_hdr));
376  frag_hdr->identification = ++running_fragment_id;
377  frag_hdr->next_hdr = nh;
378  frag_hdr->rsv = 0;
379  has_more = 0;
380  initial_offset = 0;
381  }
382  payload = (u8 *) (frag_hdr + 1);
383 
384  u16 headers_len = payload - (u8 *) vlib_buffer_get_current (p);
385  u16 max_payload = vnet_buffer (p)->ip_frag.mtu - headers_len;
386  u16 rem = p->current_length - headers_len;
387  u16 ptr = 0;
388 
389  if (max_payload < 8)
390  {
391  *error = IP_FRAG_ERROR_CANT_FRAGMENT_HEADER;
392  return;
393  }
394 
395  while (rem)
396  {
397  u32 bi;
398  vlib_buffer_t *b;
399  u16 len = (rem > max_payload) ? (max_payload & ~0x7) : rem;
400  rem -= len;
401 
402  if (ptr != 0)
403  {
404  if (!vlib_buffer_alloc (vm, &bi, 1))
405  {
406  *error = IP_FRAG_ERROR_MEMORY;
407  return;
408  }
409  b = vlib_get_buffer (vm, bi);
410  vnet_buffer (b)->sw_if_index[VLIB_RX] =
411  vnet_buffer (p)->sw_if_index[VLIB_RX];
412  vnet_buffer (b)->sw_if_index[VLIB_TX] =
413  vnet_buffer (p)->sw_if_index[VLIB_TX];
414 
415  /* Copy Adj_index in case DPO based node is sending for the fragmentation,
416  the packet would be sent back to the proper DPO next node and Index */
417  vnet_buffer (b)->ip.adj_index[VLIB_RX] =
418  vnet_buffer (p)->ip.adj_index[VLIB_RX];
419  vnet_buffer (b)->ip.adj_index[VLIB_TX] =
420  vnet_buffer (p)->ip.adj_index[VLIB_TX];
421 
423  vlib_buffer_get_current (p), headers_len);
424  clib_memcpy (vlib_buffer_get_current (b) + headers_len,
425  payload + ptr, len);
426  frag_hdr =
427  vlib_buffer_get_current (b) + headers_len - sizeof (*frag_hdr);
428  }
429  else
430  {
431  bi = pi;
432  b = vlib_get_buffer (vm, bi);
433  //frag_hdr already set here
434  }
435 
436  ip6_hdr =
437  vlib_buffer_get_current (b) + vnet_buffer (p)->ip_frag.header_offset;
438  frag_hdr->fragment_offset_and_more =
439  ip6_frag_hdr_offset_and_more (initial_offset + (ptr >> 3),
440  (rem || has_more));
441  b->current_length = headers_len + len;
442  ip6_hdr->payload_length =
443  clib_host_to_net_u16 (b->current_length -
444  vnet_buffer (p)->ip_frag.header_offset -
445  sizeof (*ip6_hdr));
446 
447  if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP4_HEADER)
448  {
449  //Encapsulating ipv4 header
450  ip4_header_t *encap_header4 =
452  encap_header4->length = clib_host_to_net_u16 (b->current_length);
453  encap_header4->checksum = ip4_header_checksum (encap_header4);
454  }
455  else if (vnet_buffer (p)->ip_frag.flags & IP_FRAG_FLAG_IP6_HEADER)
456  {
457  //Encapsulating ipv6 header
458  ip6_header_t *encap_header6 =
460  encap_header6->payload_length =
461  clib_host_to_net_u16 (b->current_length -
462  sizeof (*encap_header6));
463  }
464 
465  vec_add1 (*buffer, bi);
466 
467  ptr += len;
468  }
469 }
470 
471 static uword
473 {
474  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
475  vlib_node_runtime_t *error_node =
477  from = vlib_frame_vector_args (frame);
478  n_left_from = frame->n_vectors;
479  next_index = node->cached_next_index;
480  u32 frag_sent = 0, small_packets = 0;
481  u32 *buffer = 0;
482 
483  while (n_left_from > 0)
484  {
485  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
486 
487  while (n_left_from > 0 && n_left_to_next > 0)
488  {
489  u32 pi0, *frag_from, frag_left;
490  vlib_buffer_t *p0;
491  ip_frag_error_t error0;
492  ip6_frag_next_t next0;
493 
494  pi0 = from[0];
495  from += 1;
496  n_left_from -= 1;
497  error0 = IP_FRAG_ERROR_NONE;
498 
499  p0 = vlib_get_buffer (vm, pi0);
500  ip6_frag_do_fragment (vm, pi0, &buffer, &error0);
501 
502  if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
503  {
504  ip_frag_trace_t *tr =
505  vlib_add_trace (vm, node, p0, sizeof (*tr));
506  tr->header_offset = vnet_buffer (p0)->ip_frag.header_offset;
507  tr->mtu = vnet_buffer (p0)->ip_frag.mtu;
508  tr->ipv6 = 1;
509  tr->n_fragments = vec_len (buffer);
510  tr->next = vnet_buffer (p0)->ip_frag.next_index;
511  }
512 
513  /* *INDENT-OFF* */
514  next0 = (error0 == IP_FRAG_ERROR_NONE) ? vnet_buffer (p0)->
515  ip_frag.next_index : IP6_FRAG_NEXT_DROP;
516  /* *INDENT-ON* */
517 
518  frag_sent += vec_len (buffer);
519  small_packets += (vec_len (buffer) == 1);
520 
521  //Send fragments that were added in the frame
522  frag_from = buffer;
523  frag_left = vec_len (buffer);
524  while (frag_left > 0)
525  {
526  while (frag_left > 0 && n_left_to_next > 0)
527  {
528  u32 i;
529  i = to_next[0] = frag_from[0];
530  frag_from += 1;
531  frag_left -= 1;
532  to_next += 1;
533  n_left_to_next -= 1;
534 
535  vlib_get_buffer (vm, i)->error = error_node->errors[error0];
536  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
537  to_next, n_left_to_next, i,
538  next0);
539  }
540  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
541  vlib_get_next_frame (vm, node, next_index, to_next,
542  n_left_to_next);
543  }
544  vec_reset_length (buffer);
545  }
546  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
547  }
548  vec_free (buffer);
550  IP_FRAG_ERROR_FRAGMENT_SENT, frag_sent);
552  IP_FRAG_ERROR_SMALL_PACKET, small_packets);
553 
554  return frame->n_vectors;
555 }
556 
557 static char *ip4_frag_error_strings[] = {
558 #define _(sym,string) string,
560 #undef _
561 };
562 
563 /* *INDENT-OFF* */
565  .function = ip4_frag,
566  .name = IP4_FRAG_NODE_NAME,
567  .vector_size = sizeof (u32),
568  .format_trace = format_ip_frag_trace,
569  .type = VLIB_NODE_TYPE_INTERNAL,
570 
571  .n_errors = IP_FRAG_N_ERROR,
572  .error_strings = ip4_frag_error_strings,
573 
574  .n_next_nodes = IP4_FRAG_N_NEXT,
575  .next_nodes = {
576  [IP4_FRAG_NEXT_IP4_REWRITE] = "ip4-rewrite",
577  [IP4_FRAG_NEXT_IP4_LOOKUP] = "ip4-lookup",
578  [IP4_FRAG_NEXT_IP6_LOOKUP] = "ip6-lookup",
579  [IP4_FRAG_NEXT_ICMP_ERROR] = "ip4-icmp-error",
580  [IP4_FRAG_NEXT_DROP] = "ip4-drop"
581  },
582 };
583 /* *INDENT-ON* */
584 
585 /* *INDENT-OFF* */
587  .function = ip6_frag,
588  .name = IP6_FRAG_NODE_NAME,
589  .vector_size = sizeof (u32),
590  .format_trace = format_ip_frag_trace,
591  .type = VLIB_NODE_TYPE_INTERNAL,
592 
593  .n_errors = IP_FRAG_N_ERROR,
594  .error_strings = ip4_frag_error_strings,
595 
596  .n_next_nodes = IP6_FRAG_N_NEXT,
597  .next_nodes = {
598  [IP6_FRAG_NEXT_IP6_REWRITE] = "ip6-rewrite",
599  [IP6_FRAG_NEXT_IP4_LOOKUP] = "ip4-lookup",
600  [IP6_FRAG_NEXT_IP6_LOOKUP] = "ip6-lookup",
601  [IP6_FRAG_NEXT_DROP] = "ip6-drop"
602  },
603 };
604 /* *INDENT-ON* */
605 
606 /*
607  * fd.io coding-style-patch-verification: ON
608  *
609  * Local Variables:
610  * eval: (c-set-style "gnu")
611  * End:
612  */
#define CLIB_UNUSED(x)
Definition: clib.h:79
#define foreach_ip_frag_error
Definition: ip_frag.h:68
void ip_frag_set_vnet_buffer(vlib_buffer_t *b, u16 offset, u16 mtu, u8 next_index, u8 flags)
Definition: ip_frag.c:190
#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:523
int i
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
u16 flags_and_fragment_offset
Definition: ip4_packet.h:150
u16 n_fragments
Definition: ip_frag.c:33
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:451
unsigned char u8
Definition: types.h:56
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 int ip4_get_fragment_offset(ip4_header_t *i)
Definition: ip4_packet.h:199
static uword ip4_frag(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip_frag.c:200
unsigned int u32
Definition: types.h:88
static int ip4_is_fragment(ip4_header_t *i)
Definition: ip4_packet.h:212
#define ip6_frag_hdr_more(hdr)
Definition: ip6_packet.h:548
u16 current_length
Nbytes between current data and the end of this buffer.
Definition: buffer.h:108
#define IP4_FRAG_NODE_NAME
Definition: ip_frag.h:43
unsigned short u16
Definition: types.h:57
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:202
#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:586
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:135
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1168
u32 flags
Definition: vhost_user.h:110
#define IP4_HEADER_FLAG_MORE_FRAGMENTS
Definition: ip4_packet.h:151
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:153
u16 n_vectors
Definition: node.h:380
vlib_main_t * vm
Definition: buffer.c:294
ip_frag_error_t
Definition: ip_frag.h:79
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:339
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: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:542
#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:492
#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:215
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
void ip6_frag_do_fragment(vlib_main_t *vm, u32 pi, u32 **buffer, ip_frag_error_t *error)
Definition: ip_frag.c:309
u16 payload_length
Definition: ip6_packet.h:338
vlib_node_registration_t ip4_frag_node
(constructor) VLIB_REGISTER_NODE (ip4_frag_node)
Definition: ip_frag.c:564
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
u64 uword
Definition: types.h:112
static char * ip4_frag_error_strings[]
Definition: ip_frag.c:557
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:360
u8 data[0]
Packet data.
Definition: buffer.h:172
static uword ip6_frag(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: ip_frag.c:472
ip6_frag_next_t
Definition: ip_frag.h:59
#define IP4_HEADER_FLAG_DONT_FRAGMENT
Definition: ip4_packet.h:152
#define ip6_frag_hdr_offset_and_more(offset, more)
Definition: ip6_packet.h:551
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:111
static u32 vlib_buffer_alloc(vlib_main_t *vm, u32 *buffers, u32 n_buffers)
Allocate buffers into supplied array.
Definition: buffer_funcs.h:490
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
void ip4_frag_do_fragment(vlib_main_t *vm, u32 pi, u32 **buffer, ip_frag_error_t *error)
Definition: ip_frag.c:50
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:246
ip4_frag_next_t
Definition: ip_frag.h:49
Definition: defs.h:46