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Vector Packet Processing
gre.c
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1 /*
2  * gre.c: gre
3  *
4  * Copyright (c) 2012 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/gre/gre.h>
20 #include <vnet/adj/adj_midchain.h>
21 
23 
24 typedef struct
25 {
26  union
27  {
28  ip4_and_gre_header_t ip4_and_gre;
29  u64 as_u64[3];
30  };
32 
33 typedef struct
34 {
35  union
36  {
37  ip6_and_gre_header_t ip6_and_gre;
38  u64 as_u64[3];
39  };
41 
42 
43 /* Packet trace structure */
44 typedef struct
45 {
46  /* Tunnel-id / index in tunnel vector */
48 
49  /* pkt length */
51 
52  /* tunnel ip addresses */
53  ip46_address_t src;
54  ip46_address_t dst;
56 
57 u8 *
58 format_gre_tx_trace (u8 * s, va_list * args)
59 {
60  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
61  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
62  gre_tx_trace_t *t = va_arg (*args, gre_tx_trace_t *);
63 
64  s = format (s, "GRE: tunnel %d len %d src %U dst %U",
65  t->tunnel_id, t->length,
68  return s;
69 }
70 
71 u8 *
72 format_gre_protocol (u8 * s, va_list * args)
73 {
74  gre_protocol_t p = va_arg (*args, u32);
77 
78  if (pi)
79  s = format (s, "%s", pi->name);
80  else
81  s = format (s, "0x%04x", p);
82 
83  return s;
84 }
85 
86 u8 *
87 format_gre_header_with_length (u8 * s, va_list * args)
88 {
90  gre_header_t *h = va_arg (*args, gre_header_t *);
91  u32 max_header_bytes = va_arg (*args, u32);
92  gre_protocol_t p = clib_net_to_host_u16 (h->protocol);
93  u32 indent, header_bytes;
94 
95  header_bytes = sizeof (h[0]);
96  if (max_header_bytes != 0 && header_bytes > max_header_bytes)
97  return format (s, "gre header truncated");
98 
99  indent = format_get_indent (s);
100 
101  s = format (s, "GRE %U", format_gre_protocol, p);
102 
103  if (max_header_bytes != 0 && header_bytes < max_header_bytes)
104  {
106  vlib_node_t *node = vlib_get_node (gm->vlib_main, pi->node_index);
107  if (node->format_buffer)
108  s = format (s, "\n%U%U",
109  format_white_space, indent,
110  node->format_buffer, (void *) (h + 1),
111  max_header_bytes - header_bytes);
112  }
113 
114  return s;
115 }
116 
117 u8 *
118 format_gre_header (u8 * s, va_list * args)
119 {
120  gre_header_t *h = va_arg (*args, gre_header_t *);
121  return format (s, "%U", format_gre_header_with_length, h, 0);
122 }
123 
124 /* Returns gre protocol as an int in host byte order. */
125 uword
127  va_list * args)
128 {
129  u16 *result = va_arg (*args, u16 *);
130  gre_main_t *gm = &gre_main;
131  int i;
132 
133  /* Named type. */
135  gm->protocol_info_by_name, &i))
136  {
138  *result = pi->protocol;
139  return 1;
140  }
141 
142  return 0;
143 }
144 
145 uword
147  va_list * args)
148 {
149  u16 *result = va_arg (*args, u16 *);
151  return 0;
152  *result = clib_host_to_net_u16 ((u16) * result);
153  return 1;
154 }
155 
156 uword
157 unformat_gre_header (unformat_input_t * input, va_list * args)
158 {
159  u8 **result = va_arg (*args, u8 **);
160  gre_header_t _h, *h = &_h;
161  u16 p;
162 
163  if (!unformat (input, "%U", unformat_gre_protocol_host_byte_order, &p))
164  return 0;
165 
166  h->protocol = clib_host_to_net_u16 (p);
167 
168  /* Add header to result. */
169  {
170  void *p;
171  u32 n_bytes = sizeof (h[0]);
172 
173  vec_add2 (*result, p, n_bytes);
174  clib_memcpy (p, h, n_bytes);
175  }
176 
177  return 1;
178 }
179 
180 static int
182 {
183  switch (link)
184  {
185  case VNET_LINK_IP4:
186  return (GRE_PROTOCOL_ip4);
187  case VNET_LINK_IP6:
188  return (GRE_PROTOCOL_ip6);
189  case VNET_LINK_MPLS:
190  return (GRE_PROTOCOL_mpls_unicast);
191  case VNET_LINK_ETHERNET:
192  return (GRE_PROTOCOL_teb);
193  case VNET_LINK_ARP:
194  return (GRE_PROTOCOL_arp);
195  case VNET_LINK_NSH:
196  ASSERT (0);
197  break;
198  }
199  ASSERT (0);
200  return (GRE_PROTOCOL_ip4);
201 }
202 
203 static u8 *
206  vnet_link_t link_type, const void *dst_address)
207 {
208  gre_main_t *gm = &gre_main;
209  ip4_and_gre_header_t *h4;
210  ip6_and_gre_header_t *h6;
211  gre_header_t *gre;
212  u8 *rewrite = NULL;
213  gre_tunnel_t *t;
214  u32 ti;
215  u8 is_ipv6;
216 
218 
219  if (~0 == ti)
220  /* not one of ours */
221  return (0);
222 
223  t = pool_elt_at_index (gm->tunnels, ti);
224 
225  is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0;
226 
227  if (!is_ipv6)
228  {
229  vec_validate (rewrite, sizeof (*h4) - 1);
230  h4 = (ip4_and_gre_header_t *) rewrite;
231  gre = &h4->gre;
232  h4->ip4.ip_version_and_header_length = 0x45;
233  h4->ip4.ttl = 254;
234  h4->ip4.protocol = IP_PROTOCOL_GRE;
235  /* fixup ip4 header length and checksum after-the-fact */
236  h4->ip4.src_address.as_u32 = t->tunnel_src.ip4.as_u32;
237  h4->ip4.dst_address.as_u32 = t->tunnel_dst.fp_addr.ip4.as_u32;
238  h4->ip4.checksum = ip4_header_checksum (&h4->ip4);
239  }
240  else
241  {
242  vec_validate (rewrite, sizeof (*h6) - 1);
243  h6 = (ip6_and_gre_header_t *) rewrite;
244  gre = &h6->gre;
245  h6->ip6.ip_version_traffic_class_and_flow_label =
246  clib_host_to_net_u32 (6 << 28);
247  h6->ip6.hop_limit = 255;
248  h6->ip6.protocol = IP_PROTOCOL_GRE;
249  /* fixup ip6 header length and checksum after-the-fact */
250  h6->ip6.src_address.as_u64[0] = t->tunnel_src.ip6.as_u64[0];
251  h6->ip6.src_address.as_u64[1] = t->tunnel_src.ip6.as_u64[1];
252  h6->ip6.dst_address.as_u64[0] = t->tunnel_dst.fp_addr.ip6.as_u64[0];
253  h6->ip6.dst_address.as_u64[1] = t->tunnel_dst.fp_addr.ip6.as_u64[1];
254  }
255 
257  {
258  gre->protocol = clib_host_to_net_u16 (GRE_PROTOCOL_erspan);
259  gre->flags_and_version = clib_host_to_net_u16 (GRE_FLAGS_SEQUENCE);
260  }
261  else
262  gre->protocol =
263  clib_host_to_net_u16 (gre_proto_from_vnet_link (link_type));
264 
265  return (rewrite);
266 }
267 
268 #define is_v4_packet(_h) ((*(u8*) _h) & 0xF0) == 0x40
269 
270 static void
272  ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
273 {
274  ip4_header_t *ip0;
275 
276  ip0 = vlib_buffer_get_current (b0);
277 
278  /* Fixup the checksum and len fields in the GRE tunnel encap
279  * that was applied at the midchain node */
280  ip0->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
281  ip0->checksum = ip4_header_checksum (ip0);
282 }
283 
284 static void
286  ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
287 {
288  ip6_header_t *ip0;
289 
290  ip0 = vlib_buffer_get_current (b0);
291 
292  /* Fixup the payload length field in the GRE tunnel encap that was applied
293  * at the midchain node */
294  ip0->payload_length =
295  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
296  sizeof (*ip0));
297 }
298 
299 void
301 {
302  gre_main_t *gm = &gre_main;
303  gre_tunnel_t *t;
304  adj_flags_t af;
305  u8 is_ipv6;
306  u32 ti;
307 
309  t = pool_elt_at_index (gm->tunnels, ti);
310  is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0;
312 
315 
317  (ai, !is_ipv6 ? gre4_fixup : gre6_fixup, NULL, af,
318  gre_build_rewrite (vnm, sw_if_index, adj_get_link_type (ai), NULL));
319 
320  gre_tunnel_stack (ai);
321 }
322 
323 
324 typedef enum
325 {
329 
330 /**
331  * @brief TX function. Only called for L2 payload including TEB or ERSPAN.
332  * L3 traffic uses the adj-midchains.
333  */
334 static uword
336  vlib_node_runtime_t * node, vlib_frame_t * frame)
337 {
338  gre_main_t *gm = &gre_main;
339  vnet_main_t *vnm = gm->vnet_main;
340  u32 next_index;
341  u32 *from, *to_next, n_left_from, n_left_to_next;
342  u32 sw_if_index0 = 0;
343  u32 sw_if_index1 = 0;
344  adj_index_t adj_index0 = ADJ_INDEX_INVALID;
345  adj_index_t adj_index1 = ADJ_INDEX_INVALID;
346  gre_tunnel_t *gt0 = NULL;
347  gre_tunnel_t *gt1 = NULL;
348 
349  /* Vector of buffer / pkt indices we're supposed to process */
350  from = vlib_frame_vector_args (frame);
351 
352  /* Number of buffers / pkts */
353  n_left_from = frame->n_vectors;
354 
355  /* Speculatively send the first buffer to the last disposition we used */
356  next_index = GRE_ENCAP_NEXT_L2_MIDCHAIN;
357 
358  while (n_left_from > 0)
359  {
360  /* set up to enqueue to our disposition with index = next_index */
361  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
362 
363  while (n_left_from >= 4 && n_left_to_next >= 2)
364  {
365  u32 bi0 = from[0];
366  u32 bi1 = from[1];
367  vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
368  vlib_buffer_t *b1 = vlib_get_buffer (vm, bi1);
369 
370  to_next[0] = bi0;
371  to_next[1] = bi1;
372  from += 2;
373  to_next += 2;
374  n_left_to_next -= 2;
375  n_left_from -= 2;
376 
377  if (sw_if_index0 != vnet_buffer (b0)->sw_if_index[VLIB_TX])
378  {
379  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
380  vnet_hw_interface_t *hi0 =
381  vnet_get_sup_hw_interface (vnm, sw_if_index0);
382  gt0 = &gm->tunnels[hi0->dev_instance];
383  adj_index0 = gt0->l2_adj_index;
384  }
385 
386  if (sw_if_index1 != vnet_buffer (b1)->sw_if_index[VLIB_TX])
387  {
388  if (sw_if_index0 == vnet_buffer (b1)->sw_if_index[VLIB_TX])
389  {
390  sw_if_index1 = sw_if_index0;
391  gt1 = gt0;
392  adj_index1 = adj_index0;
393  }
394  else
395  {
396  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];
397  vnet_hw_interface_t *hi1 =
398  vnet_get_sup_hw_interface (vnm, sw_if_index1);
399  gt1 = &gm->tunnels[hi1->dev_instance];
400  adj_index1 = gt1->l2_adj_index;
401  }
402  }
403 
404  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = adj_index0;
405  vnet_buffer (b1)->ip.adj_index[VLIB_TX] = adj_index1;
406 
408  {
409  /* Encap GRE seq# and ERSPAN type II header */
410  vlib_buffer_advance (b0, -sizeof (erspan_t2_t));
411  erspan_t2_t *h0 = vlib_buffer_get_current (b0);
412  u32 seq_num = clib_atomic_fetch_add (&gt0->gre_sn->seq_num, 1);
413  u64 hdr = clib_host_to_net_u64 (ERSPAN_HDR2);
414  h0->seq_num = clib_host_to_net_u32 (seq_num);
415  h0->t2_u64 = hdr;
416  h0->t2.cos_en_t_session |=
417  clib_host_to_net_u16 (gt0->session_id);
418  }
420  {
421  /* Encap GRE seq# and ERSPAN type II header */
422  vlib_buffer_advance (b1, -sizeof (erspan_t2_t));
423  erspan_t2_t *h1 = vlib_buffer_get_current (b1);
424  u32 seq_num = clib_atomic_fetch_add (&gt1->gre_sn->seq_num, 1);
425  u64 hdr = clib_host_to_net_u64 (ERSPAN_HDR2);
426  h1->seq_num = clib_host_to_net_u32 (seq_num);
427  h1->t2_u64 = hdr;
428  h1->t2.cos_en_t_session |=
429  clib_host_to_net_u16 (gt1->session_id);
430  }
431 
432  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
433  {
434  gre_tx_trace_t *tr0 = vlib_add_trace (vm, node,
435  b0, sizeof (*tr0));
436  tr0->tunnel_id = gt0 - gm->tunnels;
437  tr0->src = gt0->tunnel_src;
438  tr0->dst = gt0->tunnel_dst.fp_addr;
439  tr0->length = vlib_buffer_length_in_chain (vm, b0);
440  }
441  if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
442  {
443  gre_tx_trace_t *tr1 = vlib_add_trace (vm, node,
444  b1, sizeof (*tr1));
445  tr1->tunnel_id = gt1 - gm->tunnels;
446  tr1->src = gt1->tunnel_src;
447  tr1->dst = gt1->tunnel_dst.fp_addr;
448  tr1->length = vlib_buffer_length_in_chain (vm, b1);
449  }
450  }
451 
452  while (n_left_from > 0 && n_left_to_next > 0)
453  {
454  u32 bi0 = from[0];
455  vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
456 
457  to_next[0] = bi0;
458  from += 1;
459  to_next += 1;
460  n_left_from -= 1;
461  n_left_to_next -= 1;
462 
463  if (sw_if_index0 != vnet_buffer (b0)->sw_if_index[VLIB_TX])
464  {
465  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
466  vnet_hw_interface_t *hi0 =
467  vnet_get_sup_hw_interface (vnm, sw_if_index0);
468  gt0 = &gm->tunnels[hi0->dev_instance];
469  adj_index0 = gt0->l2_adj_index;
470  }
471 
472  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = adj_index0;
473 
475  {
476  /* Encap GRE seq# and ERSPAN type II header */
477  vlib_buffer_advance (b0, -sizeof (erspan_t2_t));
478  erspan_t2_t *h0 = vlib_buffer_get_current (b0);
479  u32 seq_num = clib_atomic_fetch_add (&gt0->gre_sn->seq_num, 1);
480  u64 hdr = clib_host_to_net_u64 (ERSPAN_HDR2);
481  h0->seq_num = clib_host_to_net_u32 (seq_num);
482  h0->t2_u64 = hdr;
483  h0->t2.cos_en_t_session |=
484  clib_host_to_net_u16 (gt0->session_id);
485  }
486 
487  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
488  {
489  gre_tx_trace_t *tr = vlib_add_trace (vm, node,
490  b0, sizeof (*tr));
491  tr->tunnel_id = gt0 - gm->tunnels;
492  tr->src = gt0->tunnel_src;
493  tr->dst = gt0->tunnel_dst.fp_addr;
494  tr->length = vlib_buffer_length_in_chain (vm, b0);
495  }
496  }
497 
498  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
499  }
500 
502  GRE_ERROR_PKTS_ENCAP, frame->n_vectors);
503 
504  return frame->n_vectors;
505 }
506 
507 static char *gre_error_strings[] = {
508 #define gre_error(n,s) s,
509 #include "error.def"
510 #undef gre_error
511 };
512 
513 /* *INDENT-OFF* */
515 {
516  .function = gre_interface_tx,
517  .name = "gre-encap",
518  .vector_size = sizeof (u32),
519  .format_trace = format_gre_tx_trace,
520  .type = VLIB_NODE_TYPE_INTERNAL,
521  .n_errors = GRE_N_ERROR,
522  .error_strings = gre_error_strings,
523  .n_next_nodes = GRE_ENCAP_N_NEXT,
524  .next_nodes = {
525  [GRE_ENCAP_NEXT_L2_MIDCHAIN] = "adj-l2-midchain",
526  },
527 };
528 
530 /* *INDENT-ON* */
531 
532 static u8 *
533 format_gre_tunnel_name (u8 * s, va_list * args)
534 {
535  u32 dev_instance = va_arg (*args, u32);
536  gre_main_t *gm = &gre_main;
537  gre_tunnel_t *t;
538 
539  if (dev_instance >= vec_len (gm->tunnels))
540  return format (s, "<improperly-referenced>");
541 
542  t = pool_elt_at_index (gm->tunnels, dev_instance);
543  return format (s, "gre%d", t->user_instance);
544 }
545 
546 static u8 *
547 format_gre_device (u8 * s, va_list * args)
548 {
549  u32 dev_instance = va_arg (*args, u32);
550  CLIB_UNUSED (int verbose) = va_arg (*args, int);
551 
552  s = format (s, "GRE tunnel: id %d\n", dev_instance);
553  return s;
554 }
555 
556 /* *INDENT-OFF* */
558  .name = "GRE tunnel device",
559  .format_device_name = format_gre_tunnel_name,
560  .format_device = format_gre_device,
561  .format_tx_trace = format_gre_tx_trace,
562  .admin_up_down_function = gre_interface_admin_up_down,
563 #ifdef SOON
564  .clear counter = 0;
565 #endif
566 };
567 
569  .name = "GRE",
570  .format_header = format_gre_header_with_length,
571  .unformat_header = unformat_gre_header,
572  .build_rewrite = gre_build_rewrite,
573  .update_adjacency = gre_update_adj,
575 };
576 /* *INDENT-ON* */
577 
578 static void
579 add_protocol (gre_main_t * gm, gre_protocol_t protocol, char *protocol_name)
580 {
582  u32 i;
583 
584  vec_add2 (gm->protocol_infos, pi, 1);
585  i = pi - gm->protocol_infos;
586 
587  pi->name = protocol_name;
588  pi->protocol = protocol;
589  pi->next_index = pi->node_index = ~0;
590 
591  hash_set (gm->protocol_info_by_protocol, protocol, i);
593 }
594 
595 static clib_error_t *
597 {
598  gre_main_t *gm = &gre_main;
599  clib_error_t *error;
600  ip_main_t *im = &ip_main;
601  ip_protocol_info_t *pi;
602 
603  clib_memset (gm, 0, sizeof (gm[0]));
604  gm->vlib_main = vm;
605  gm->vnet_main = vnet_get_main ();
606 
607  if ((error = vlib_call_init_function (vm, ip_main_init)))
608  return error;
609 
610  if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
611  return error;
612 
613  if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
614  return error;
615 
616  /* Set up the ip packet generator */
617  pi = ip_get_protocol_info (im, IP_PROTOCOL_GRE);
620 
621  gm->protocol_info_by_name = hash_create_string (0, sizeof (uword));
622  gm->protocol_info_by_protocol = hash_create (0, sizeof (uword));
623  gm->tunnel_by_key4 =
624  hash_create_mem (0, sizeof (gre_tunnel_key4_t), sizeof (uword));
625  gm->tunnel_by_key6 =
626  hash_create_mem (0, sizeof (gre_tunnel_key6_t), sizeof (uword));
627  gm->seq_num_by_key =
628  hash_create_mem (0, sizeof (gre_sn_key_t), sizeof (uword));
629 
630 #define _(n,s) add_protocol (gm, GRE_PROTOCOL_##s, #s);
632 #undef _
634 }
635 
637 
638 /*
639  * fd.io coding-style-patch-verification: ON
640  *
641  * Local Variables:
642  * eval: (c-set-style "gnu")
643  * End:
644  */
vnet_main_t * vnet_main
Definition: gre.h:298
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:439
fib_protocol_t fp_proto
protocol type
Definition: fib_types.h:212
uword * seq_num_by_key
Hash mapping tunnel src/dst addr and fib-idx to sequence number.
Definition: gre.h:285
VNET_HW_INTERFACE_CLASS(gre_hw_interface_class)
ip46_address_t src
Definition: gre.c:53
static uword gre_interface_tx(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
TX function.
Definition: gre.c:335
#define hash_set(h, key, value)
Definition: hash.h:255
uword * tunnel_by_key6
Hash mapping to tunnels with ipv6 src/dst addr.
Definition: gre.h:280
GRE related global data.
Definition: gre.h:255
#define CLIB_UNUSED(x)
Definition: clib.h:82
Key for a IPv6 GRE Tunnel We use a different type so that the V4 key hash is as small as possible...
Definition: gre.h:120
uword * protocol_info_by_protocol
Definition: gre.h:270
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
static vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
static clib_error_t * ip4_lookup_init(vlib_main_t *vm)
Definition: ip4_forward.c:906
u64 as_u64
Definition: bihash_doc.h:63
u32 tunnel_id
Definition: gre.c:47
unsigned long u64
Definition: types.h:89
vnet_link_t adj_get_link_type(adj_index_t ai)
Return the link type of the adjacency.
Definition: adj.c:468
#define NULL
Definition: clib.h:58
gre_protocol_t protocol
GRE protocol type in host byte order.
Definition: gre.h:77
char * name
Name (a c string).
Definition: gre.h:74
IP unicast adjacency.
Definition: adj.h:221
A GRE payload protocol registration.
Definition: gre.h:71
#define vec_add2(V, P, N)
Add N elements to end of vector V, return pointer to new elements in P.
Definition: vec.h:564
int i
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:983
format_function_t format_ip46_address
Definition: format.h:61
static u32 format_get_indent(u8 *s)
Definition: format.h:72
#define hash_set_mem(h, key, value)
Definition: hash.h:275
clib_memset(h->entries, 0, sizeof(h->entries[0])*entries)
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
Definition: ip.h:109
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:267
unsigned char u8
Definition: types.h:56
u32 * tunnel_index_by_sw_if_index
Mapping from sw_if_index to tunnel index.
Definition: gre.h:290
VNET_DEVICE_CLASS(gre_device_class)
#define clib_memcpy(d, s, n)
Definition: string.h:180
u32 seq_num
Definition: gre.h:159
Hash key for GRE header seq number generation for ERSPAN encap.
Definition: gre.h:166
unformat_function_t * unformat_pg_edit
Definition: ip.h:90
ip4_and_gre_header_t ip4_and_gre
Definition: gre.c:28
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:163
u32 sw_if_index
Definition: vxlan_gbp.api:37
static void gre4_fixup(vlib_main_t *vm, ip_adjacency_t *adj, vlib_buffer_t *b0, const void *data)
Definition: gre.c:271
IPv4 and GRE header union.
Definition: gre.c:24
u8 * format_white_space(u8 *s, va_list *va)
Definition: std-formats.c:113
void gre_tunnel_stack(adj_index_t ai)
gre_tunnel_stack
Definition: interface.c:129
gre_encap_next_t
Definition: gre.c:324
#define vec_elt_at_index(v, i)
Get vector value at index i checking that i is in bounds.
ip6_and_gre_header_t ip6_and_gre
Definition: gre.c:37
unsigned int u32
Definition: types.h:88
adj_index_t l2_adj_index
an L2 tunnel always rquires an L2 midchain.
Definition: gre.h:226
#define vlib_call_init_function(vm, x)
Definition: init.h:260
ip46_address_t tunnel_src
The tunnel&#39;s source/local address.
Definition: gre.h:197
uword unformat_gre_header(unformat_input_t *input, va_list *args)
Definition: gre.c:157
#define hash_create_string(elts, value_bytes)
Definition: hash.h:690
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:223
#define hash_create_mem(elts, key_bytes, value_bytes)
Definition: hash.h:661
uword * tunnel_by_key4
Hash mapping to tunnels with ipv4 src/dst addr.
Definition: gre.h:275
#define ADJ_INDEX_INVALID
Invalid ADJ index - used when no adj is known likewise blazoned capitals INVALID speak volumes where ...
Definition: adj_types.h:36
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
A representation of a GRE tunnel.
Definition: gre.h:176
vlib_node_registration_t gre_encap_node
(constructor) VLIB_REGISTER_NODE (gre_encap_node)
Definition: gre.c:514
static ip_protocol_info_t * ip_get_protocol_info(ip_main_t *im, u32 protocol)
Definition: ip.h:136
ip46_address_t fp_addr
The address type is not deriveable from the fp_addr member.
Definition: fib_types.h:226
#define gm
Definition: dlmalloc.c:1217
format_function_t * format_header
Definition: ip.h:81
struct _unformat_input_t unformat_input_t
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:214
u32 node_index
Node which handles this type.
Definition: gre.h:83
void gre_update_adj(vnet_main_t *vnm, u32 sw_if_index, adj_index_t ai)
Definition: gre.c:300
#define PREDICT_FALSE(x)
Definition: clib.h:111
format_function_t * format_buffer
Definition: node.h:381
u32 node_index
Node index.
Definition: node.h:519
#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:368
u16 flags_and_version
Definition: packet.h:40
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1180
uword * protocol_info_by_name
Hash tables mapping name/protocol to protocol info index.
Definition: gre.h:270
static u8 * format_gre_tunnel_name(u8 *s, va_list *args)
Definition: gre.c:533
static clib_error_t * gre_input_init(vlib_main_t *vm)
Definition: node.c:665
static clib_error_t * gre_init(vlib_main_t *vm)
Definition: gre.c:596
Key for a IPv4 GRE Tunnel.
Definition: gre.h:92
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
clib_error_t * ip_main_init(vlib_main_t *vm)
Definition: ip_init.c:45
gre_tunnel_type_t type
Definition: gre.h:208
u16 n_vectors
Definition: node.h:420
vlib_main_t * vm
Definition: buffer.c:301
static u8 * format_gre_device(u8 *s, va_list *args)
Definition: gre.c:547
ip_main_t ip_main
Definition: ip_init.c:42
gre_sn_t * gre_sn
GRE header sequence number (SN) used for ERSPAN type 2 header, must be bumped automically to be threa...
Definition: gre.h:239
u16 protocol
Definition: packet.h:55
void adj_nbr_midchain_update_rewrite(adj_index_t adj_index, adj_midchain_fixup_t fixup, const void *fixup_data, adj_flags_t flags, u8 *rewrite)
adj_nbr_midchain_update_rewrite
Definition: adj_midchain.c:509
gre_protocol_t
Definition: packet.h:30
u32 adj_index_t
An index for adjacencies.
Definition: adj_types.h:30
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
u8 * format_gre_header_with_length(u8 *s, va_list *args)
Definition: gre.c:87
u8 * format_gre_tx_trace(u8 *s, va_list *args)
Definition: gre.c:58
#define hash_create(elts, value_bytes)
Definition: hash.h:696
#define ASSERT(truth)
static u8 * gre_build_rewrite(vnet_main_t *vnm, u32 sw_if_index, vnet_link_t link_type, const void *dst_address)
Definition: gre.c:204
u32 next_index
Next index for this type.
Definition: gre.h:86
static void gre6_fixup(vlib_main_t *vm, ip_adjacency_t *adj, vlib_buffer_t *b0, const void *data)
Definition: gre.c:285
#define ERSPAN_HDR2
Definition: packet.h:164
enum vnet_link_t_ vnet_link_t
Link Type: A description of the protocol of packets on the link.
static int gre_proto_from_vnet_link(vnet_link_t link)
Definition: gre.c:181
gre_tunnel_t * tunnels
pool of tunnel instances
Definition: gre.h:260
uword unformat_vlib_number_by_name(unformat_input_t *input, va_list *args)
Definition: format.c:157
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:233
vnet_hw_interface_class_t gre_hw_interface_class
u32 user_instance
Definition: gre.h:243
#define clib_atomic_fetch_add(a, b)
Definition: atomics.h:23
enum adj_flags_t_ adj_flags_t
Flags on an IP adjacency.
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:57
Definition: defs.h:47
vnet_device_class_t gre_device_class
clib_error_t * gre_interface_admin_up_down(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: interface.c:455
ip46_address_t dst
Definition: gre.c:54
u16 payload_length
Definition: ip6_packet.h:369
ERSPAN type 2 - the tunnel is for port mirror SPAN output.
Definition: gre.h:57
static void add_protocol(gre_main_t *gm, gre_protocol_t protocol, char *protocol_name)
Definition: gre.c:579
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
uword unformat_gre_protocol_host_byte_order(unformat_input_t *input, va_list *args)
Definition: gre.c:126
#define GRE_FLAGS_SEQUENCE
Definition: packet.h:47
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:274
a point 2 point interface
Definition: interface.h:382
u8 * format_gre_header(u8 *s, va_list *args)
Definition: gre.c:118
unformat_function_t unformat_pg_gre_header
Definition: gre.h:356
u8 * format_gre_protocol(u8 *s, va_list *args)
Definition: gre.c:72
#define vnet_buffer(b)
Definition: buffer.h:368
fib_prefix_t tunnel_dst
The tunnel&#39;s destination/remote address.
Definition: gre.h:201
static vlib_node_t * vlib_get_node(vlib_main_t *vm, u32 i)
Get vlib node by index.
Definition: node_funcs.h:59
static gre_protocol_info_t * gre_get_protocol_info(gre_main_t *em, gre_protocol_t protocol)
Definition: gre.h:325
gre_protocol_info_t * protocol_infos
GRE payload protocol registrations.
Definition: gre.h:265
u32 length
Definition: gre.c:50
vlib_main_t * vlib_main
Definition: gre.h:297
static clib_error_t * ip6_lookup_init(vlib_main_t *vm)
Definition: ip6_forward.c:2627
uword unformat_gre_protocol_net_byte_order(unformat_input_t *input, va_list *args)
Definition: gre.c:146
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:117
static char * gre_error_strings[]
Definition: gre.c:507
gre_main_t gre_main
Definition: gre.c:22
u16 session_id
ERSPAN type 2 session ID, least significant 10 bits of u16.
Definition: gre.h:231
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:62
static u16 ip4_header_checksum(ip4_header_t *i)
Definition: ip4_packet.h:247
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972