FD.io VPP  v21.01.1
Vector Packet Processing
nsh_node.c
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1 /*
2  * nsh_node.c - nsh nodes
3  *
4  * Copyright (c) 2013 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/plugin/plugin.h>
20 #include <nsh/nsh.h>
21 
22 always_inline void
23 nsh_md2_encap (vlib_buffer_t * b, nsh_base_header_t * hdr,
24  nsh_entry_t * nsh_entry)
25 {
26  nsh_main_t *nm = &nsh_main;
27  nsh_base_header_t *nsh_base;
28  nsh_tlv_header_t *opt0;
29  nsh_tlv_header_t *limit0;
30  nsh_tlv_header_t *nsh_md2;
31  nsh_option_map_t *nsh_option;
32  u8 old_option_size = 0;
33  u8 new_option_size = 0;
34 
35  /* Populate the NSH Header */
36  opt0 = (nsh_tlv_header_t *) (nsh_entry->tlvs_data);
37  limit0 = (nsh_tlv_header_t *) (nsh_entry->tlvs_data + nsh_entry->tlvs_len);
38 
39  nsh_md2 = (nsh_tlv_header_t *) ((u8 *) hdr /*nsh_entry->rewrite */ +
40  sizeof (nsh_base_header_t));
41  nsh_entry->rewrite_size = sizeof (nsh_base_header_t);
42 
43  /* Scan the set of variable metadata, process ones that we understand */
44  while (opt0 < limit0)
45  {
46  old_option_size = sizeof (nsh_tlv_header_t) + opt0->length;
47  /* round to 4-byte */
48  old_option_size = ((old_option_size + 3) >> 2) << 2;
49 
50  nsh_option = nsh_md2_lookup_option (opt0->class, opt0->type);
51  if (nsh_option == NULL)
52  {
53  goto next_tlv_md2;
54  }
55 
56  if (nm->options[nsh_option->option_id])
57  {
58  if ((*nm->options[nsh_option->option_id]) (b, nsh_md2))
59  {
60  goto next_tlv_md2;
61  }
62 
63  /* option length may be varied */
64  new_option_size = sizeof (nsh_tlv_header_t) + nsh_md2->length;
65  /* round to 4-byte */
66  new_option_size = ((new_option_size + 3) >> 2) << 2;
67  nsh_entry->rewrite_size += new_option_size;
68 
69  nsh_md2 = (nsh_tlv_header_t *) (((u8 *) nsh_md2) + new_option_size);
70  opt0 = (nsh_tlv_header_t *) (((u8 *) opt0) + old_option_size);
71 
72  }
73  else
74  {
75  next_tlv_md2:
76  opt0 = (nsh_tlv_header_t *) (((u8 *) opt0) + old_option_size);
77  }
78  }
79 
80  /* update nsh header's length */
81  nsh_base = (nsh_base_header_t *) nsh_entry->rewrite;
82  nsh_base->length = (nsh_base->length & NSH_TTL_L2_MASK) |
83  ((nsh_entry->rewrite_size >> 2) & NSH_LEN_MASK);
84  return;
85 }
86 
87 always_inline void
89  nsh_base_header_t * hdr,
90  u32 header_len,
91  nsh_entry_t * nsh_entry, u32 * next, u32 drop_node_val)
92 {
93  nsh_main_t *nm = &nsh_main;
94  nsh_base_header_t *nsh_base;
95  nsh_tlv_header_t *opt0;
96  nsh_tlv_header_t *limit0;
97  nsh_tlv_header_t *nsh_md2;
98  nsh_option_map_t *nsh_option;
99  u8 old_option_size = 0;
100  u8 new_option_size = 0;
101 
102  /* Populate the NSH Header */
103  opt0 = (nsh_md2_data_t *) (hdr + 1);
104  limit0 = (nsh_md2_data_t *) ((u8 *) hdr + header_len);
105 
106  nsh_md2 =
107  (nsh_tlv_header_t *) (nsh_entry->rewrite + sizeof (nsh_base_header_t));
108  nsh_entry->rewrite_size = sizeof (nsh_base_header_t);
109 
110  /* Scan the set of variable metadata, process ones that we understand */
111  while (opt0 < limit0)
112  {
113  old_option_size = sizeof (nsh_tlv_header_t) + opt0->length;
114  /* round to 4-byte */
115  old_option_size = ((old_option_size + 3) >> 2) << 2;
116 
117  nsh_option = nsh_md2_lookup_option (opt0->class, opt0->type);
118  if (nsh_option == NULL)
119  {
120  goto next_tlv_md2;
121  }
122 
123  if (nm->swap_options[nsh_option->option_id])
124  {
125  if ((*nm->swap_options[nsh_option->option_id]) (b, opt0, nsh_md2))
126  {
127  goto next_tlv_md2;
128  }
129 
130  /* option length may be varied */
131  new_option_size = sizeof (nsh_tlv_header_t) + nsh_md2->length;
132  /* round to 4-byte */
133  new_option_size = ((new_option_size + 3) >> 2) << 2;
134  nsh_entry->rewrite_size += new_option_size;
135  nsh_md2 = (nsh_tlv_header_t *) (((u8 *) nsh_md2) + new_option_size);
136 
137  opt0 = (nsh_tlv_header_t *) (((u8 *) opt0) + old_option_size);
138 
139  }
140  else
141  {
142  next_tlv_md2:
143  opt0 = (nsh_tlv_header_t *) (((u8 *) opt0) + old_option_size);
144  }
145  }
146 
147  /* update nsh header's length */
148  nsh_base = (nsh_base_header_t *) nsh_entry->rewrite;
149  nsh_base->length = (nsh_base->length & NSH_TTL_L2_MASK) |
150  ((nsh_entry->rewrite_size >> 2) & NSH_LEN_MASK);
151  return;
152 }
153 
154 always_inline void
156  nsh_base_header_t * hdr,
157  u32 * header_len, u32 * next, u32 drop_node_val)
158 {
159  nsh_main_t *nm = &nsh_main;
160  nsh_md2_data_t *opt0;
161  nsh_md2_data_t *limit0;
162  nsh_option_map_t *nsh_option;
163  u8 option_len = 0;
164 
165  /* Populate the NSH Header */
166  opt0 = (nsh_md2_data_t *) (hdr + 1);
167  limit0 = (nsh_md2_data_t *) ((u8 *) hdr + *header_len);
168 
169  /* Scan the set of variable metadata, process ones that we understand */
170  while (opt0 < limit0)
171  {
172  nsh_option = nsh_md2_lookup_option (opt0->class, opt0->type);
173  if (nsh_option == NULL)
174  {
175  *next = drop_node_val;
176  return;
177  }
178 
179  if (nm->pop_options[nsh_option->option_id])
180  {
181  if ((*nm->pop_options[nsh_option->option_id]) (b, opt0))
182  {
183  *next = drop_node_val;
184  return;
185  }
186  }
187  /* round to 4-byte */
188  option_len = ((opt0->length + 3) >> 2) << 2;
189  opt0 =
190  (nsh_md2_data_t *) (((u8 *) opt0) + sizeof (nsh_md2_data_t) +
191  option_len);
192  *next =
193  (nm->decap_v4_next_override) ? (nm->decap_v4_next_override) : (*next);
194  *header_len = (nm->decap_v4_next_override) ? 0 : (*header_len);
195  }
196 
197  return;
198 }
199 
200 static uword
203  vlib_frame_t * from_frame, u32 node_type)
204 {
205  u32 n_left_from, next_index, *from, *to_next;
206  nsh_main_t *nm = &nsh_main;
207 
208  from = vlib_frame_vector_args (from_frame);
209  n_left_from = from_frame->n_vectors;
210 
211  next_index = node->cached_next_index;
212 
213  while (n_left_from > 0)
214  {
215  u32 n_left_to_next;
216 
217  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
218 
219  while (n_left_from >= 4 && n_left_to_next >= 2)
220  {
221  u32 bi0, bi1;
222  vlib_buffer_t *b0, *b1;
223  u32 next0 = NSH_NODE_NEXT_DROP, next1 = NSH_NODE_NEXT_DROP;
224  uword *entry0, *entry1;
225  nsh_base_header_t *hdr0 = 0, *hdr1 = 0;
226  u32 header_len0 = 0, header_len1 = 0;
227  u32 nsp_nsi0, nsp_nsi1;
228  u32 ttl0, ttl1;
229  u32 error0, error1;
230  nsh_map_t *map0 = 0, *map1 = 0;
231  nsh_entry_t *nsh_entry0 = 0, *nsh_entry1 = 0;
232  nsh_base_header_t *encap_hdr0 = 0, *encap_hdr1 = 0;
233  u32 encap_hdr_len0 = 0, encap_hdr_len1 = 0;
234  nsh_proxy_session_by_key_t key0, key1;
235  uword *p0, *p1;
236  nsh_proxy_session_t *proxy0, *proxy1;
237  u32 sw_if_index0 = 0, sw_if_index1 = 0;
238  ethernet_header_t placeholder_eth0, placeholder_eth1;
239 
240  /* Prefetch next iteration. */
241  {
242  vlib_buffer_t *p2, *p3;
243 
244  p2 = vlib_get_buffer (vm, from[2]);
245  p3 = vlib_get_buffer (vm, from[3]);
246 
247  vlib_prefetch_buffer_header (p2, LOAD);
248  vlib_prefetch_buffer_header (p3, LOAD);
249 
250  CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
251  CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
252  }
253 
254  bi0 = from[0];
255  bi1 = from[1];
256  to_next[0] = bi0;
257  to_next[1] = bi1;
258  from += 2;
259  to_next += 2;
260  n_left_from -= 2;
261  n_left_to_next -= 2;
262 
263  error0 = 0;
264  error1 = 0;
265 
266  b0 = vlib_get_buffer (vm, bi0);
267  b1 = vlib_get_buffer (vm, bi1);
268  hdr0 = vlib_buffer_get_current (b0);
269  hdr1 = vlib_buffer_get_current (b1);
270 
271  /* Process packet 0 */
272  if (node_type == NSH_INPUT_TYPE)
273  {
274  nsp_nsi0 = hdr0->nsp_nsi;
275  header_len0 = (hdr0->length & NSH_LEN_MASK) * 4;
276  ttl0 = (hdr0->ver_o_c & NSH_TTL_H4_MASK) << 2 |
277  (hdr0->length & NSH_TTL_L2_MASK) >> 6;
278  ttl0 = ttl0 - 1;
279  if (PREDICT_FALSE (ttl0 == 0))
280  {
281  error0 = NSH_NODE_ERROR_INVALID_TTL;
282  goto trace0;
283  }
284  }
285  else if (node_type == NSH_CLASSIFIER_TYPE)
286  {
287  nsp_nsi0 =
288  clib_host_to_net_u32 (vnet_buffer (b0)->
289  l2_classify.opaque_index);
290  }
291  else if (node_type == NSH_AWARE_VNF_PROXY_TYPE)
292  {
293  /* Push placeholder Eth header */
294  char placeholder_dst_address[6] =
295  { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66 };
296  char placeholder_src_address[6] =
297  { 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc };
298  clib_memcpy_fast (placeholder_eth0.dst_address,
299  placeholder_dst_address, 6);
300  clib_memcpy_fast (placeholder_eth0.src_address,
301  placeholder_src_address, 6);
302  placeholder_eth0.type = 0x0800;
303  vlib_buffer_advance (b0, -(word) sizeof (ethernet_header_t));
304  hdr0 = vlib_buffer_get_current (b0);
305  clib_memcpy_fast (hdr0, &placeholder_eth0,
306  (word) sizeof (ethernet_header_t));
307 
308  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
309  nsp_nsi0 = nm->tunnel_index_by_sw_if_index[sw_if_index0];
310  }
311  else
312  {
313  clib_memset (&key0, 0, sizeof (key0));
314  key0.transport_type = NSH_NODE_NEXT_ENCAP_VXLAN4;
315  key0.transport_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
316 
317  p0 = hash_get_mem (nm->nsh_proxy_session_by_key, &key0);
318  if (PREDICT_FALSE (p0 == 0))
319  {
320  error0 = NSH_NODE_ERROR_NO_PROXY;
321  goto trace0;
322  }
323 
324  proxy0 = pool_elt_at_index (nm->nsh_proxy_sessions, p0[0]);
325  if (PREDICT_FALSE (proxy0 == 0))
326  {
327  error0 = NSH_NODE_ERROR_NO_PROXY;
328  goto trace0;
329  }
330  nsp_nsi0 = proxy0->nsp_nsi;
331  }
332 
333  entry0 = hash_get_mem (nm->nsh_mapping_by_key, &nsp_nsi0);
334  if (PREDICT_FALSE (entry0 == 0))
335  {
336  error0 = NSH_NODE_ERROR_NO_MAPPING;
337  goto trace0;
338  }
339 
340  /* Entry should point to a mapping ... */
341  map0 = pool_elt_at_index (nm->nsh_mappings, entry0[0]);
342  if (PREDICT_FALSE (map0 == 0))
343  {
344  error0 = NSH_NODE_ERROR_NO_MAPPING;
345  goto trace0;
346  }
347 
348  /* set up things for next node to transmit ie which node to handle it and where */
349  next0 = map0->next_node;
350  vnet_buffer (b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
351  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = map0->adj_index;
352 
353  if (PREDICT_FALSE (map0->nsh_action == NSH_ACTION_POP))
354  {
355  /* Manipulate MD2 */
356  if (PREDICT_FALSE (hdr0->md_type == 2))
357  {
358  nsh_md2_decap (b0, hdr0, &header_len0, &next0,
359  NSH_NODE_NEXT_DROP);
360  if (PREDICT_FALSE (next0 == NSH_NODE_NEXT_DROP))
361  {
362  error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
363  goto trace0;
364  }
365  vnet_buffer (b0)->sw_if_index[VLIB_RX] =
366  map0->rx_sw_if_index;
367  }
368 
369  /* Pop NSH header */
370  vlib_buffer_advance (b0, (word) header_len0);
371  goto trace0;
372  }
373 
374  entry0 = hash_get_mem (nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
375  if (PREDICT_FALSE (entry0 == 0))
376  {
377  error0 = NSH_NODE_ERROR_NO_ENTRY;
378  goto trace0;
379  }
380 
381  nsh_entry0 =
382  (nsh_entry_t *) pool_elt_at_index (nm->nsh_entries, entry0[0]);
383  encap_hdr0 = (nsh_base_header_t *) (nsh_entry0->rewrite);
384  /* rewrite_size should equal to (encap_hdr0->length * 4) */
385  encap_hdr_len0 = nsh_entry0->rewrite_size;
386 
387  if (PREDICT_TRUE (map0->nsh_action == NSH_ACTION_SWAP))
388  {
389  /* Manipulate MD2 */
390  if (PREDICT_FALSE (hdr0->md_type == 2))
391  {
392  nsh_md2_swap (b0, hdr0, header_len0, nsh_entry0,
393  &next0, NSH_NODE_NEXT_DROP);
394  if (PREDICT_FALSE (next0 == NSH_NODE_NEXT_DROP))
395  {
396  error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
397  goto trace0;
398  }
399  }
400 
401  /* Pop old NSH header */
402  vlib_buffer_advance (b0, (word) header_len0);
403 
404  /* After processing, md2's length may be varied */
405  encap_hdr_len0 = nsh_entry0->rewrite_size;
406  /* Push new NSH header */
407  vlib_buffer_advance (b0, -(word) encap_hdr_len0);
408  hdr0 = vlib_buffer_get_current (b0);
409  clib_memcpy_fast (hdr0, encap_hdr0, (word) encap_hdr_len0);
410 
411  goto trace0;
412  }
413 
414  if (PREDICT_TRUE (map0->nsh_action == NSH_ACTION_PUSH))
415  {
416  /* After processing, md2's length may be varied */
417  encap_hdr_len0 = nsh_entry0->rewrite_size;
418  /* Push new NSH header */
419  vlib_buffer_advance (b0, -(word) encap_hdr_len0);
420  hdr0 = vlib_buffer_get_current (b0);
421  clib_memcpy_fast (hdr0, encap_hdr0, (word) encap_hdr_len0);
422 
423  /* Manipulate MD2 */
424  if (PREDICT_FALSE (nsh_entry0->nsh_base.md_type == 2))
425  {
426  nsh_md2_encap (b0, hdr0, nsh_entry0);
427  }
428 
429  }
430 
431  trace0:
432  b0->error = error0 ? node->errors[error0] : 0;
433 
434  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
435  {
436  nsh_input_trace_t *tr =
437  vlib_add_trace (vm, node, b0, sizeof (*tr));
438  clib_memcpy_fast (&(tr->trace_data), hdr0,
439  ((hdr0->length & NSH_LEN_MASK) * 4));
440  }
441 
442  /* Process packet 1 */
443  if (node_type == NSH_INPUT_TYPE)
444  {
445  nsp_nsi1 = hdr1->nsp_nsi;
446  header_len1 = (hdr1->length & NSH_LEN_MASK) * 4;
447  ttl1 = (hdr1->ver_o_c & NSH_TTL_H4_MASK) << 2 |
448  (hdr1->length & NSH_TTL_L2_MASK) >> 6;
449  ttl1 = ttl1 - 1;
450  if (PREDICT_FALSE (ttl1 == 0))
451  {
452  error1 = NSH_NODE_ERROR_INVALID_TTL;
453  goto trace1;
454  }
455  }
456  else if (node_type == NSH_CLASSIFIER_TYPE)
457  {
458  nsp_nsi1 =
459  clib_host_to_net_u32 (vnet_buffer (b1)->
460  l2_classify.opaque_index);
461  }
462  else if (node_type == NSH_AWARE_VNF_PROXY_TYPE)
463  {
464  /* Push placeholder Eth header */
465  char placeholder_dst_address[6] =
466  { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66 };
467  char placeholder_src_address[6] =
468  { 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc };
469  clib_memcpy_fast (placeholder_eth1.dst_address,
470  placeholder_dst_address, 6);
471  clib_memcpy_fast (placeholder_eth1.src_address,
472  placeholder_src_address, 6);
473  placeholder_eth1.type = 0x0800;
474  vlib_buffer_advance (b1, -(word) sizeof (ethernet_header_t));
475  hdr1 = vlib_buffer_get_current (b1);
476  clib_memcpy_fast (hdr1, &placeholder_eth1,
477  (word) sizeof (ethernet_header_t));
478 
479  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];
480  nsp_nsi1 = nm->tunnel_index_by_sw_if_index[sw_if_index1];
481  }
482  else
483  {
484  clib_memset (&key1, 0, sizeof (key1));
485  key1.transport_type = NSH_NODE_NEXT_ENCAP_VXLAN4;
486  key1.transport_index = vnet_buffer (b1)->sw_if_index[VLIB_RX];
487 
488  p1 = hash_get_mem (nm->nsh_proxy_session_by_key, &key1);
489  if (PREDICT_FALSE (p1 == 0))
490  {
491  error1 = NSH_NODE_ERROR_NO_PROXY;
492  goto trace1;
493  }
494 
495  proxy1 = pool_elt_at_index (nm->nsh_proxy_sessions, p1[0]);
496  if (PREDICT_FALSE (proxy1 == 0))
497  {
498  error1 = NSH_NODE_ERROR_NO_PROXY;
499  goto trace1;
500  }
501  nsp_nsi1 = proxy1->nsp_nsi;
502  }
503 
504  entry1 = hash_get_mem (nm->nsh_mapping_by_key, &nsp_nsi1);
505  if (PREDICT_FALSE (entry1 == 0))
506  {
507  error1 = NSH_NODE_ERROR_NO_MAPPING;
508  goto trace1;
509  }
510 
511  /* Entry should point to a mapping ... */
512  map1 = pool_elt_at_index (nm->nsh_mappings, entry1[0]);
513  if (PREDICT_FALSE (map1 == 0))
514  {
515  error1 = NSH_NODE_ERROR_NO_MAPPING;
516  goto trace1;
517  }
518 
519  /* set up things for next node to transmit ie which node to handle it and where */
520  next1 = map1->next_node;
521  vnet_buffer (b1)->sw_if_index[VLIB_TX] = map1->sw_if_index;
522  vnet_buffer (b1)->ip.adj_index[VLIB_TX] = map1->adj_index;
523 
524  if (PREDICT_FALSE (map1->nsh_action == NSH_ACTION_POP))
525  {
526  /* Manipulate MD2 */
527  if (PREDICT_FALSE (hdr1->md_type == 2))
528  {
529  nsh_md2_decap (b1, hdr1, &header_len1, &next1,
530  NSH_NODE_NEXT_DROP);
531  if (PREDICT_FALSE (next1 == NSH_NODE_NEXT_DROP))
532  {
533  error1 = NSH_NODE_ERROR_INVALID_OPTIONS;
534  goto trace1;
535  }
536  vnet_buffer (b1)->sw_if_index[VLIB_RX] =
537  map1->rx_sw_if_index;
538  }
539 
540  /* Pop NSH header */
541  vlib_buffer_advance (b1, (word) header_len1);
542  goto trace1;
543  }
544 
545  entry1 = hash_get_mem (nm->nsh_entry_by_key, &map1->mapped_nsp_nsi);
546  if (PREDICT_FALSE (entry1 == 0))
547  {
548  error1 = NSH_NODE_ERROR_NO_ENTRY;
549  goto trace1;
550  }
551 
552  nsh_entry1 =
553  (nsh_entry_t *) pool_elt_at_index (nm->nsh_entries, entry1[0]);
554  encap_hdr1 = (nsh_base_header_t *) (nsh_entry1->rewrite);
555  /* rewrite_size should equal to (encap_hdr0->length * 4) */
556  encap_hdr_len1 = nsh_entry1->rewrite_size;
557 
558  if (PREDICT_TRUE (map1->nsh_action == NSH_ACTION_SWAP))
559  {
560  /* Manipulate MD2 */
561  if (PREDICT_FALSE (hdr1->md_type == 2))
562  {
563  nsh_md2_swap (b1, hdr1, header_len1, nsh_entry1,
564  &next1, NSH_NODE_NEXT_DROP);
565  if (PREDICT_FALSE (next1 == NSH_NODE_NEXT_DROP))
566  {
567  error1 = NSH_NODE_ERROR_INVALID_OPTIONS;
568  goto trace1;
569  }
570  }
571 
572  /* Pop old NSH header */
573  vlib_buffer_advance (b1, (word) header_len1);
574 
575  /* After processing, md2's length may be varied */
576  encap_hdr_len1 = nsh_entry1->rewrite_size;
577  /* Push new NSH header */
578  vlib_buffer_advance (b1, -(word) encap_hdr_len1);
579  hdr1 = vlib_buffer_get_current (b1);
580  clib_memcpy_fast (hdr1, encap_hdr1, (word) encap_hdr_len1);
581 
582  goto trace1;
583  }
584 
585  if (PREDICT_FALSE (map1->nsh_action == NSH_ACTION_PUSH))
586  {
587  /* After processing, md2's length may be varied */
588  encap_hdr_len1 = nsh_entry1->rewrite_size;
589  /* Push new NSH header */
590  vlib_buffer_advance (b1, -(word) encap_hdr_len1);
591  hdr1 = vlib_buffer_get_current (b1);
592  clib_memcpy_fast (hdr1, encap_hdr1, (word) encap_hdr_len1);
593 
594  /* Manipulate MD2 */
595  if (PREDICT_FALSE (nsh_entry1->nsh_base.md_type == 2))
596  {
597  nsh_md2_encap (b1, hdr1, nsh_entry1);
598  }
599 
600  }
601 
602  trace1:
603  b1->error = error1 ? node->errors[error1] : 0;
604 
605  if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
606  {
607  nsh_input_trace_t *tr =
608  vlib_add_trace (vm, node, b1, sizeof (*tr));
609  clib_memcpy_fast (&(tr->trace_data), hdr1,
610  ((hdr1->length & NSH_LEN_MASK) * 4));
611  }
612 
613  vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
614  n_left_to_next, bi0, bi1, next0,
615  next1);
616 
617  }
618 
619  while (n_left_from > 0 && n_left_to_next > 0)
620  {
621  u32 bi0 = 0;
622  vlib_buffer_t *b0 = NULL;
623  u32 next0 = NSH_NODE_NEXT_DROP;
624  uword *entry0;
625  nsh_base_header_t *hdr0 = 0;
626  u32 header_len0 = 0;
627  u32 nsp_nsi0;
628  u32 ttl0;
629  u32 error0;
630  nsh_map_t *map0 = 0;
631  nsh_entry_t *nsh_entry0 = 0;
632  nsh_base_header_t *encap_hdr0 = 0;
633  u32 encap_hdr_len0 = 0;
635  uword *p0;
636  nsh_proxy_session_t *proxy0 = 0;
637  u32 sw_if_index0 = 0;
638  ethernet_header_t placeholder_eth0;
639 
640  bi0 = from[0];
641  to_next[0] = bi0;
642  from += 1;
643  to_next += 1;
644  n_left_from -= 1;
645  n_left_to_next -= 1;
646  error0 = 0;
647 
648  b0 = vlib_get_buffer (vm, bi0);
649  hdr0 = vlib_buffer_get_current (b0);
650 
651  if (node_type == NSH_INPUT_TYPE)
652  {
653  nsp_nsi0 = hdr0->nsp_nsi;
654  header_len0 = (hdr0->length & NSH_LEN_MASK) * 4;
655  ttl0 = (hdr0->ver_o_c & NSH_TTL_H4_MASK) << 2 |
656  (hdr0->length & NSH_TTL_L2_MASK) >> 6;
657  ttl0 = ttl0 - 1;
658  if (PREDICT_FALSE (ttl0 == 0))
659  {
660  error0 = NSH_NODE_ERROR_INVALID_TTL;
661  goto trace00;
662  }
663  }
664  else if (node_type == NSH_CLASSIFIER_TYPE)
665  {
666  nsp_nsi0 =
667  clib_host_to_net_u32 (vnet_buffer (b0)->
668  l2_classify.opaque_index);
669  }
670  else if (node_type == NSH_AWARE_VNF_PROXY_TYPE)
671  {
672  /* Push placeholder Eth header */
673  char placeholder_dst_address[6] =
674  { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66 };
675  char placeholder_src_address[6] =
676  { 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc };
677  clib_memcpy_fast (placeholder_eth0.dst_address,
678  placeholder_dst_address, 6);
679  clib_memcpy_fast (placeholder_eth0.src_address,
680  placeholder_src_address, 6);
681  placeholder_eth0.type = 0x0800;
682  vlib_buffer_advance (b0, -(word) sizeof (ethernet_header_t));
683  hdr0 = vlib_buffer_get_current (b0);
684  clib_memcpy_fast (hdr0, &placeholder_eth0,
685  (word) sizeof (ethernet_header_t));
686 
687  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
688  nsp_nsi0 = nm->tunnel_index_by_sw_if_index[sw_if_index0];
689  }
690  else
691  {
692  clib_memset (&key0, 0, sizeof (key0));
693  key0.transport_type = NSH_NODE_NEXT_ENCAP_VXLAN4;
694  key0.transport_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
695 
696  p0 = hash_get_mem (nm->nsh_proxy_session_by_key, &key0);
697  if (PREDICT_FALSE (p0 == 0))
698  {
699  error0 = NSH_NODE_ERROR_NO_PROXY;
700  goto trace00;
701  }
702 
703  proxy0 = pool_elt_at_index (nm->nsh_proxy_sessions, p0[0]);
704  if (PREDICT_FALSE (proxy0 == 0))
705  {
706  error0 = NSH_NODE_ERROR_NO_PROXY;
707  goto trace00;
708  }
709  nsp_nsi0 = proxy0->nsp_nsi;
710  }
711 
712  entry0 = hash_get_mem (nm->nsh_mapping_by_key, &nsp_nsi0);
713 
714  if (PREDICT_FALSE (entry0 == 0))
715  {
716  error0 = NSH_NODE_ERROR_NO_MAPPING;
717  goto trace00;
718  }
719 
720  /* Entry should point to a mapping ... */
721  map0 = pool_elt_at_index (nm->nsh_mappings, entry0[0]);
722 
723  if (PREDICT_FALSE (map0 == 0))
724  {
725  error0 = NSH_NODE_ERROR_NO_MAPPING;
726  goto trace00;
727  }
728 
729  /* set up things for next node to transmit ie which node to handle it and where */
730  next0 = map0->next_node;
731  vnet_buffer (b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
732  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = map0->adj_index;
733  vnet_buffer (b0)->sw_if_index[VLIB_RX] = map0->nsh_sw_if;
734 
735  if (PREDICT_FALSE (map0->nsh_action == NSH_ACTION_POP))
736  {
737  /* Manipulate MD2 */
738  if (PREDICT_FALSE (hdr0->md_type == 2))
739  {
740  nsh_md2_decap (b0, hdr0, &header_len0, &next0,
741  NSH_NODE_NEXT_DROP);
742  if (PREDICT_FALSE (next0 == NSH_NODE_NEXT_DROP))
743  {
744  error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
745  goto trace00;
746  }
747  vnet_buffer (b0)->sw_if_index[VLIB_RX] =
748  map0->rx_sw_if_index;
749  }
750 
751  /* Pop NSH header */
752  vlib_buffer_advance (b0, (word) header_len0);
753  goto trace00;
754  }
755 
756  entry0 = hash_get_mem (nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
757  if (PREDICT_FALSE (entry0 == 0))
758  {
759  error0 = NSH_NODE_ERROR_NO_ENTRY;
760  goto trace00;
761  }
762 
763  nsh_entry0 =
764  (nsh_entry_t *) pool_elt_at_index (nm->nsh_entries, entry0[0]);
765  encap_hdr0 = (nsh_base_header_t *) (nsh_entry0->rewrite);
766  /* rewrite_size should equal to (encap_hdr0->length * 4) */
767  encap_hdr_len0 = nsh_entry0->rewrite_size;
768 
769  if (PREDICT_TRUE (map0->nsh_action == NSH_ACTION_SWAP))
770  {
771  /* Manipulate MD2 */
772  if (PREDICT_FALSE (hdr0->md_type == 2))
773  {
774  nsh_md2_swap (b0, hdr0, header_len0, nsh_entry0,
775  &next0, NSH_NODE_NEXT_DROP);
776  if (PREDICT_FALSE (next0 == NSH_NODE_NEXT_DROP))
777  {
778  error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
779  goto trace00;
780  }
781  }
782 
783  /* Pop old NSH header */
784  vlib_buffer_advance (b0, (word) header_len0);
785 
786  /* After processing, md2's length may be varied */
787  encap_hdr_len0 = nsh_entry0->rewrite_size;
788  /* Push new NSH header */
789  vlib_buffer_advance (b0, -(word) encap_hdr_len0);
790  hdr0 = vlib_buffer_get_current (b0);
791  clib_memcpy_fast (hdr0, encap_hdr0, (word) encap_hdr_len0);
792 
793  goto trace00;
794  }
795 
796  if (PREDICT_TRUE (map0->nsh_action == NSH_ACTION_PUSH))
797  {
798  /* After processing, md2's length may be varied */
799  encap_hdr_len0 = nsh_entry0->rewrite_size;
800  /* Push new NSH header */
801  vlib_buffer_advance (b0, -(word) encap_hdr_len0);
802  hdr0 = vlib_buffer_get_current (b0);
803  clib_memcpy_fast (hdr0, encap_hdr0, (word) encap_hdr_len0);
804  /* Manipulate MD2 */
805  if (PREDICT_FALSE (nsh_entry0->nsh_base.md_type == 2))
806  {
807  nsh_md2_encap (b0, hdr0, nsh_entry0);
808  }
809 
810  }
811 
812  trace00:b0->error = error0 ? node->errors[error0] : 0;
813 
814  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
815  {
816  nsh_input_trace_t *tr =
817  vlib_add_trace (vm, node, b0, sizeof (*tr));
818  clib_memcpy_fast (&(tr->trace_data[0]), hdr0,
819  ((hdr0->length & NSH_LEN_MASK) * 4));
820  }
821 
822  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
823  n_left_to_next, bi0, next0);
824  }
825 
826  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
827 
828  }
829 
830  return from_frame->n_vectors;
831 }
832 
833 /**
834  * @brief Graph processing dispatch function for NSH Input
835  *
836  * @node nsh_input
837  * @param *vm
838  * @param *node
839  * @param *from_frame
840  *
841  * @return from_frame->n_vectors
842  *
843  */
845  vlib_frame_t * from_frame)
846 {
847  return nsh_input_map (vm, node, from_frame, NSH_INPUT_TYPE);
848 }
849 
850 /**
851  * @brief Graph processing dispatch function for NSH-Proxy
852  *
853  * @node nsh_proxy
854  * @param *vm
855  * @param *node
856  * @param *from_frame
857  *
858  * @return from_frame->n_vectors
859  *
860  */
862  vlib_frame_t * from_frame)
863 {
864  return nsh_input_map (vm, node, from_frame, NSH_PROXY_TYPE);
865 }
866 
867 /**
868  * @brief Graph processing dispatch function for NSH Classifier
869  *
870  * @node nsh_classifier
871  * @param *vm
872  * @param *node
873  * @param *from_frame
874  *
875  * @return from_frame->n_vectors
876  *
877  */
880  vlib_frame_t * from_frame)
881 {
882  return nsh_input_map (vm, node, from_frame, NSH_CLASSIFIER_TYPE);
883 }
884 
885 /**
886  * @brief Graph processing dispatch function for NSH-AWARE-VNF-PROXY
887  *
888  * @node nsh_aware_vnf_proxy
889  * @param *vm
890  * @param *node
891  * @param *from_frame
892  *
893  * @return from_frame->n_vectors
894  *
895  */
898  vlib_frame_t * from_frame)
899 {
900  return nsh_input_map (vm, node, from_frame, NSH_AWARE_VNF_PROXY_TYPE);
901 }
902 
903 static char *nsh_node_error_strings[] = {
904 #define _(sym,string) string,
906 #undef _
907 };
908 
909 /* *INDENT-OFF* */
910 
911 /* register nsh-input node */
913  .name = "nsh-input",
914  .vector_size = sizeof (u32),
915  .format_trace = format_nsh_node_map_trace,
916  .format_buffer = format_nsh_header,
918  .n_errors = ARRAY_LEN (nsh_node_error_strings),
919  .error_strings = nsh_node_error_strings,
920  .n_next_nodes = NSH_NODE_N_NEXT,
921  .next_nodes = {
922 #define _(s,n) [NSH_NODE_NEXT_##s] = n,
924 #undef _
925  },
926 };
927 
928 /* register nsh-proxy node */
930 {
931  .name = "nsh-proxy",
932  .vector_size = sizeof (u32),
933  .format_trace = format_nsh_node_map_trace,
934  .format_buffer = format_nsh_header,
936  .n_errors = ARRAY_LEN (nsh_node_error_strings),
937  .error_strings = nsh_node_error_strings,
938  .n_next_nodes = NSH_NODE_N_NEXT,
939  .next_nodes = {
940 #define _(s,n) [NSH_NODE_NEXT_##s] = n,
942 #undef _
943  },
944 };
945 
946 /* register nsh-classifier node */
948 {
949  .name = "nsh-classifier",
950  .vector_size = sizeof (u32),
951  .format_trace = format_nsh_node_map_trace,
952  .format_buffer = format_nsh_header,
954  .n_errors = ARRAY_LEN (nsh_node_error_strings),
955  .error_strings = nsh_node_error_strings,
956  .n_next_nodes = NSH_NODE_N_NEXT,
957  .next_nodes = {
958 #define _(s,n) [NSH_NODE_NEXT_##s] = n,
960 #undef _
961  },
962 };
963 
964 /* register nsh-aware-vnf-proxy node */
966 {
967  .name = "nsh-aware-vnf-proxy",
968  .vector_size = sizeof (u32),
969  .format_trace = format_nsh_node_map_trace,
970  .format_buffer = format_nsh_header,
972  .n_errors = ARRAY_LEN (nsh_node_error_strings),
973  .error_strings = nsh_node_error_strings,
974  .n_next_nodes = NSH_NODE_N_NEXT,
975  .next_nodes = {
976 #define _(s,n) [NSH_NODE_NEXT_##s] = n,
978 #undef _
979  },
980 };
981 /* *INDENT-ON* */
982 
983 /*
984  * fd.io coding-style-patch-verification: ON
985  *
986  * Local Variables:
987  * eval: (c-set-style "gnu")
988  * End:
989  */
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:124
u32 sw_if_index
Definition: nsh.h:82
u32 nsh_action
Definition: nsh.h:74
u8 * format_nsh_node_map_trace(u8 *s, va_list *args)
Definition: nsh_cli.c:594
static uword nsh_input_map(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame, u32 node_type)
Definition: nsh_node.c:201
u32 * tunnel_index_by_sw_if_index
Mapping from sw_if_index to tunnel index.
Definition: nsh.h:131
#define PREDICT_TRUE(x)
Definition: clib.h:122
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
clib_memset(h->entries, 0, sizeof(h->entries[0]) *entries)
u32 next_node
Definition: nsh.h:84
#define foreach_nsh_node_next
Definition: nsh.h:208
u8 src_address[6]
Definition: packet.h:56
u32 nsh_sw_if
Definition: nsh.h:79
#define NSH_LEN_MASK
Definition: nsh_packet.h:109
static char * nsh_node_error_strings[]
Definition: nsh_node.c:903
vlib_main_t * vm
Definition: in2out_ed.c:1580
#define VLIB_NODE_FN(node)
Definition: node.h:203
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:470
vlib_node_registration_t nsh_proxy_node
(constructor) VLIB_REGISTER_NODE (nsh_proxy_node)
Definition: nsh_node.c:929
unsigned char u8
Definition: types.h:56
nsh_base_header_t nsh_base
Definition: nsh.h:40
nsh_proxy_session_t * nsh_proxy_sessions
Definition: nsh.h:123
i64 word
Definition: types.h:111
vlib_node_registration_t nsh_aware_vnf_proxy_node
(constructor) VLIB_REGISTER_NODE (nsh_aware_vnf_proxy_node)
Definition: nsh_node.c:965
u8 dst_address[6]
Definition: packet.h:55
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:207
nsh_entry_t * nsh_entries
Definition: nsh.h:110
const cJSON *const b
Definition: cJSON.h:255
u32 adj_index
Definition: nsh.h:85
unsigned int u32
Definition: types.h:88
vlib_node_registration_t nsh_classifier_node
(constructor) VLIB_REGISTER_NODE (nsh_classifier_node)
Definition: nsh_node.c:947
nsh_option_map_t * nsh_md2_lookup_option(u16 class, u8 type)
Definition: nsh.c:88
vl_api_fib_path_type_t type
Definition: fib_types.api:123
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:546
Definition: nsh.h:59
nsh_map_t * nsh_mappings
Definition: nsh.h:116
uword * nsh_entry_by_key
Definition: nsh.h:113
u8 * rewrite
Rewrite string.
Definition: nsh.h:50
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:233
#define PREDICT_FALSE(x)
Definition: clib.h:121
#define always_inline
Definition: ipsec.h:28
#define vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1)
Finish enqueueing two buffers forward in the graph.
Definition: buffer_node.h:70
#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:224
#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:391
uword decap_v4_next_override
Definition: nsh.h:156
int(* pop_options[MAX_MD2_OPTIONS])(vlib_buffer_t *b, nsh_tlv_header_t *opt)
Definition: nsh.h:153
int(* swap_options[MAX_MD2_OPTIONS])(vlib_buffer_t *b, nsh_tlv_header_t *old_opt, nsh_tlv_header_t *new_opt)
Definition: nsh.h:150
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:170
u16 n_vectors
Definition: node.h:397
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
u8 data[]
Packet data.
Definition: buffer.h:181
uword * nsh_proxy_session_by_key
Definition: nsh.h:126
nsh_main_t nsh_main
Definition: nsh.c:28
u8 tlvs_len
Definition: nsh.h:45
#define ARRAY_LEN(x)
Definition: clib.h:67
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:483
#define foreach_nsh_node_error
Definition: nsh.h:191
vlib_main_t vlib_node_runtime_t * node
Definition: in2out_ed.c:1580
nsh_tlv_header_t nsh_md2_data_t
Definition: nsh_packet.h:93
u32 mapped_nsp_nsi
Key for nsh_header_t entry to map to.
Definition: nsh.h:72
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:511
u32 rx_sw_if_index
Definition: nsh.h:83
u32 option_id
Definition: nsh.h:29
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:252
static void nsh_md2_encap(vlib_buffer_t *b, nsh_base_header_t *hdr, nsh_entry_t *nsh_entry)
Definition: nsh_node.c:23
u8 rewrite_size
Definition: nsh.h:51
int(* options[MAX_MD2_OPTIONS])(vlib_buffer_t *b, nsh_tlv_header_t *opt)
Definition: nsh.h:148
Definition: defs.h:47
u8 * tlvs_data
Definition: nsh.h:46
static void nsh_md2_swap(vlib_buffer_t *b, nsh_base_header_t *hdr, u32 header_len, nsh_entry_t *nsh_entry, u32 *next, u32 drop_node_val)
Definition: nsh_node.c:88
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
u8 trace_data[256]
Definition: nsh.h:176
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:297
#define NSH_TTL_L2_MASK
Definition: nsh_packet.h:108
#define hash_get_mem(h, key)
Definition: hash.h:269
#define vnet_buffer(b)
Definition: buffer.h:417
static void nsh_md2_decap(vlib_buffer_t *b, nsh_base_header_t *hdr, u32 *header_len, u32 *next, u32 drop_node_val)
Definition: nsh_node.c:155
Note: rewrite and rewrite_size used to support varied nsh header.
Definition: nsh.h:36
void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace.c:634
#define NSH_TTL_H4_MASK
Definition: nsh_packet.h:107
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:59
uword * nsh_mapping_by_key
Definition: nsh.h:119
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
Definition: defs.h:46
vlib_node_registration_t nsh_input_node
(constructor) VLIB_REGISTER_NODE (nsh_input_node)
Definition: nsh_node.c:912
u8 * format_nsh_header(u8 *s, va_list *args)
Definition: nsh_cli.c:509