FD.io VPP  v18.01.2-1-g9b554f3
Vector Packet Processing
gtpu_encap.c
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1 /*
2  * Copyright (c) 2017 Intel 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 #include <vppinfra/error.h>
16 #include <vppinfra/hash.h>
17 #include <vnet/vnet.h>
18 #include <vnet/ip/ip.h>
19 #include <vnet/ethernet/ethernet.h>
20 #include <gtpu/gtpu.h>
21 
22 /* Statistics (not all errors) */
23 #define foreach_gtpu_encap_error \
24 _(ENCAPSULATED, "good packets encapsulated")
25 
26 static char * gtpu_encap_error_strings[] = {
27 #define _(sym,string) string,
29 #undef _
30 };
31 
32 typedef enum {
33 #define _(sym,str) GTPU_ENCAP_ERROR_##sym,
35 #undef _
38 
39 #define foreach_gtpu_encap_next \
40 _(DROP, "error-drop") \
41 _(IP4_LOOKUP, "ip4-lookup") \
42 _(IP6_LOOKUP, "ip6-lookup")
43 
44 typedef enum {
50 
51 typedef struct {
55 
56 u8 * format_gtpu_encap_trace (u8 * s, va_list * args)
57 {
58  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
59  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
61  = va_arg (*args, gtpu_encap_trace_t *);
62 
63  s = format (s, "GTPU encap to gtpu_tunnel%d teid %d",
64  t->tunnel_index, t->teid);
65  return s;
66 }
67 
68 
69 #define foreach_fixed_header4_offset \
70  _(0) _(1) _(2) _(3)
71 
72 #define foreach_fixed_header6_offset \
73  _(0) _(1) _(2) _(3) _(4) _(5) _(6)
74 
77  vlib_node_runtime_t * node,
78  vlib_frame_t * from_frame,
79  u32 is_ip4)
80 {
81  u32 n_left_from, next_index, * from, * to_next;
82  gtpu_main_t * gtm = &gtpu_main;
83  vnet_main_t * vnm = gtm->vnet_main;
85  u32 pkts_encapsulated = 0;
86  u16 old_l0 = 0, old_l1 = 0, old_l2 = 0, old_l3 = 0;
87  u32 thread_index = vlib_get_thread_index();
88  u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
89  u32 sw_if_index0 = 0, sw_if_index1 = 0, sw_if_index2 = 0, sw_if_index3 = 0;
90  u32 next0 = 0, next1 = 0, next2 = 0, next3 = 0;
91  vnet_hw_interface_t * hi0, * hi1, * hi2, * hi3;
92  gtpu_tunnel_t * t0 = NULL, * t1 = NULL, * t2 = NULL, * t3 = NULL;
93 
94  from = vlib_frame_vector_args (from_frame);
95  n_left_from = from_frame->n_vectors;
96 
97  next_index = node->cached_next_index;
98  stats_sw_if_index = node->runtime_data[0];
99  stats_n_packets = stats_n_bytes = 0;
100 
101  while (n_left_from > 0)
102  {
103  u32 n_left_to_next;
104 
105  vlib_get_next_frame (vm, node, next_index,
106  to_next, n_left_to_next);
107 
108  while (n_left_from >= 8 && n_left_to_next >= 4)
109  {
110  u32 bi0, bi1, bi2, bi3;
111  vlib_buffer_t * b0, * b1, * b2, * b3;
112  u32 flow_hash0, flow_hash1, flow_hash2, flow_hash3;
113  u32 len0, len1, len2, len3;
114  ip4_header_t * ip4_0, * ip4_1, * ip4_2, * ip4_3;
115  ip6_header_t * ip6_0, * ip6_1, * ip6_2, * ip6_3;
116  udp_header_t * udp0, * udp1, * udp2, * udp3;
117  gtpu_header_t * gtpu0, * gtpu1, * gtpu2, * gtpu3;
118  u64 * copy_src0, * copy_dst0;
119  u64 * copy_src1, * copy_dst1;
120  u64 * copy_src2, * copy_dst2;
121  u64 * copy_src3, * copy_dst3;
122  u32 * copy_src_last0, * copy_dst_last0;
123  u32 * copy_src_last1, * copy_dst_last1;
124  u32 * copy_src_last2, * copy_dst_last2;
125  u32 * copy_src_last3, * copy_dst_last3;
126  u16 new_l0, new_l1, new_l2, new_l3;
127  ip_csum_t sum0, sum1, sum2, sum3;
128 
129  /* Prefetch next iteration. */
130  {
131  vlib_buffer_t * p4, * p5, * p6, * p7;
132 
133  p4 = vlib_get_buffer (vm, from[4]);
134  p5 = vlib_get_buffer (vm, from[5]);
135  p6 = vlib_get_buffer (vm, from[6]);
136  p7 = vlib_get_buffer (vm, from[7]);
137 
138  vlib_prefetch_buffer_header (p4, LOAD);
139  vlib_prefetch_buffer_header (p5, LOAD);
140  vlib_prefetch_buffer_header (p6, LOAD);
141  vlib_prefetch_buffer_header (p7, LOAD);
142 
147  }
148 
149  bi0 = from[0];
150  bi1 = from[1];
151  bi2 = from[2];
152  bi3 = from[3];
153  to_next[0] = bi0;
154  to_next[1] = bi1;
155  to_next[2] = bi2;
156  to_next[3] = bi3;
157  from += 4;
158  to_next += 4;
159  n_left_to_next -= 4;
160  n_left_from -= 4;
161 
162  b0 = vlib_get_buffer (vm, bi0);
163  b1 = vlib_get_buffer (vm, bi1);
164  b2 = vlib_get_buffer (vm, bi2);
165  b3 = vlib_get_buffer (vm, bi3);
166 
167  flow_hash0 = vnet_l2_compute_flow_hash (b0);
168  flow_hash1 = vnet_l2_compute_flow_hash (b1);
169  flow_hash2 = vnet_l2_compute_flow_hash (b2);
170  flow_hash3 = vnet_l2_compute_flow_hash (b3);
171 
172  /* Get next node index and adj index from tunnel next_dpo */
173  sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
174  sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
175  sw_if_index2 = vnet_buffer(b2)->sw_if_index[VLIB_TX];
176  sw_if_index3 = vnet_buffer(b3)->sw_if_index[VLIB_TX];
177  hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
178  hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
179  hi2 = vnet_get_sup_hw_interface (vnm, sw_if_index2);
180  hi3 = vnet_get_sup_hw_interface (vnm, sw_if_index3);
181  t0 = &gtm->tunnels[hi0->dev_instance];
182  t1 = &gtm->tunnels[hi1->dev_instance];
183  t2 = &gtm->tunnels[hi2->dev_instance];
184  t3 = &gtm->tunnels[hi3->dev_instance];
185 
186  /* Note: change to always set next0 if it may be set to drop */
187  next0 = t0->next_dpo.dpoi_next_node;
188  vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
189  next1 = t1->next_dpo.dpoi_next_node;
190  vnet_buffer(b1)->ip.adj_index[VLIB_TX] = t1->next_dpo.dpoi_index;
191  next2 = t2->next_dpo.dpoi_next_node;
192  vnet_buffer(b2)->ip.adj_index[VLIB_TX] = t2->next_dpo.dpoi_index;
193  next3 = t3->next_dpo.dpoi_next_node;
194  vnet_buffer(b3)->ip.adj_index[VLIB_TX] = t3->next_dpo.dpoi_index;
195 
196  /* Apply the rewrite string. $$$$ vnet_rewrite? */
197  vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
198  vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite));
199  vlib_buffer_advance (b2, -(word)_vec_len(t2->rewrite));
200  vlib_buffer_advance (b3, -(word)_vec_len(t3->rewrite));
201 
202  if (is_ip4)
203  {
204  ip4_0 = vlib_buffer_get_current(b0);
205  ip4_1 = vlib_buffer_get_current(b1);
206  ip4_2 = vlib_buffer_get_current(b2);
207  ip4_3 = vlib_buffer_get_current(b3);
208 
209  /* Copy the fixed header */
210  copy_dst0 = (u64 *) ip4_0;
211  copy_src0 = (u64 *) t0->rewrite;
212  copy_dst1 = (u64 *) ip4_1;
213  copy_src1 = (u64 *) t1->rewrite;
214  copy_dst2 = (u64 *) ip4_2;
215  copy_src2 = (u64 *) t2->rewrite;
216  copy_dst3 = (u64 *) ip4_3;
217  copy_src3 = (u64 *) t3->rewrite;
218 
219  /* Copy first 32 octets 8-bytes at a time */
220 #define _(offs) copy_dst0[offs] = copy_src0[offs];
222 #undef _
223 #define _(offs) copy_dst1[offs] = copy_src1[offs];
225 #undef _
226 #define _(offs) copy_dst2[offs] = copy_src2[offs];
228 #undef _
229 #define _(offs) copy_dst3[offs] = copy_src3[offs];
231 #undef _
232  /* Last 4 octets. Hopefully gcc will be our friend */
233  copy_dst_last0 = (u32 *)(&copy_dst0[4]);
234  copy_src_last0 = (u32 *)(&copy_src0[4]);
235  copy_dst_last0[0] = copy_src_last0[0];
236  copy_dst_last1 = (u32 *)(&copy_dst1[4]);
237  copy_src_last1 = (u32 *)(&copy_src1[4]);
238  copy_dst_last1[0] = copy_src_last1[0];
239  copy_dst_last2 = (u32 *)(&copy_dst2[4]);
240  copy_src_last2 = (u32 *)(&copy_src2[4]);
241  copy_dst_last2[0] = copy_src_last2[0];
242  copy_dst_last3 = (u32 *)(&copy_dst3[4]);
243  copy_src_last3 = (u32 *)(&copy_src3[4]);
244  copy_dst_last3[0] = copy_src_last3[0];
245 
246  /* Fix the IP4 checksum and length */
247  sum0 = ip4_0->checksum;
248  new_l0 = /* old_l0 always 0, see the rewrite setup */
249  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
250  sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
251  length /* changed member */);
252  ip4_0->checksum = ip_csum_fold (sum0);
253  ip4_0->length = new_l0;
254  sum1 = ip4_1->checksum;
255  new_l1 = /* old_l1 always 0, see the rewrite setup */
256  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
257  sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
258  length /* changed member */);
259  ip4_1->checksum = ip_csum_fold (sum1);
260  ip4_1->length = new_l1;
261  sum2 = ip4_2->checksum;
262  new_l2 = /* old_l0 always 0, see the rewrite setup */
263  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b2));
264  sum2 = ip_csum_update (sum2, old_l2, new_l2, ip4_header_t,
265  length /* changed member */);
266  ip4_2->checksum = ip_csum_fold (sum2);
267  ip4_2->length = new_l2;
268  sum3 = ip4_3->checksum;
269  new_l3 = /* old_l1 always 0, see the rewrite setup */
270  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b3));
271  sum3 = ip_csum_update (sum3, old_l3, new_l3, ip4_header_t,
272  length /* changed member */);
273  ip4_3->checksum = ip_csum_fold (sum3);
274  ip4_3->length = new_l3;
275 
276  /* Fix UDP length and set source port */
277  udp0 = (udp_header_t *)(ip4_0+1);
278  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
279  - sizeof (*ip4_0));
280  udp0->length = new_l0;
281  udp0->src_port = flow_hash0;
282  udp1 = (udp_header_t *)(ip4_1+1);
283  new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
284  - sizeof (*ip4_1));
285  udp1->length = new_l1;
286  udp1->src_port = flow_hash1;
287  udp2 = (udp_header_t *)(ip4_2+1);
288  new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
289  - sizeof (*ip4_2));
290  udp2->length = new_l2;
291  udp2->src_port = flow_hash2;
292  udp3 = (udp_header_t *)(ip4_3+1);
293  new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
294  - sizeof (*ip4_3));
295  udp3->length = new_l3;
296  udp3->src_port = flow_hash3;
297 
298  /* Fix GTPU length */
299  gtpu0 = (gtpu_header_t *)(udp0+1);
300  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
301  - sizeof (*ip4_0) - sizeof(*udp0));
302  gtpu0->length = new_l0;
303  gtpu1 = (gtpu_header_t *)(udp1+1);
304  new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
305  - sizeof (*ip4_1) - sizeof(*udp1));
306  gtpu1->length = new_l1;
307  gtpu2 = (gtpu_header_t *)(udp2+1);
308  new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
309  - sizeof (*ip4_2) - sizeof(*udp2));
310  gtpu2->length = new_l2;
311  gtpu3 = (gtpu_header_t *)(udp1+3);
312  new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
313  - sizeof (*ip4_3) - sizeof(*udp3));
314  gtpu3->length = new_l3;
315  }
316  else /* ipv6 */
317  {
318  int bogus = 0;
319 
320  ip6_0 = vlib_buffer_get_current(b0);
321  ip6_1 = vlib_buffer_get_current(b1);
322  ip6_2 = vlib_buffer_get_current(b2);
323  ip6_3 = vlib_buffer_get_current(b3);
324 
325  /* Copy the fixed header */
326  copy_dst0 = (u64 *) ip6_0;
327  copy_src0 = (u64 *) t0->rewrite;
328  copy_dst1 = (u64 *) ip6_1;
329  copy_src1 = (u64 *) t1->rewrite;
330  copy_dst2 = (u64 *) ip6_2;
331  copy_src2 = (u64 *) t2->rewrite;
332  copy_dst3 = (u64 *) ip6_3;
333  copy_src3 = (u64 *) t3->rewrite;
334  /* Copy first 56 (ip6) octets 8-bytes at a time */
335 #define _(offs) copy_dst0[offs] = copy_src0[offs];
337 #undef _
338 #define _(offs) copy_dst1[offs] = copy_src1[offs];
340 #undef _
341 #define _(offs) copy_dst2[offs] = copy_src2[offs];
343 #undef _
344 #define _(offs) copy_dst3[offs] = copy_src3[offs];
346 #undef _
347  /* Fix IP6 payload length */
348  new_l0 =
349  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
350  - sizeof(*ip6_0));
351  ip6_0->payload_length = new_l0;
352  new_l1 =
353  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
354  - sizeof(*ip6_1));
355  ip6_1->payload_length = new_l1;
356  new_l2 =
357  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b2)
358  - sizeof(*ip6_2));
359  ip6_2->payload_length = new_l2;
360  new_l3 =
361  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b3)
362  - sizeof(*ip6_3));
363  ip6_3->payload_length = new_l3;
364 
365  /* Fix UDP length and set source port */
366  udp0 = (udp_header_t *)(ip6_0+1);
367  udp0->length = new_l0;
368  udp0->src_port = flow_hash0;
369  udp1 = (udp_header_t *)(ip6_1+1);
370  udp1->length = new_l1;
371  udp1->src_port = flow_hash1;
372  udp2 = (udp_header_t *)(ip6_2+1);
373  udp2->length = new_l2;
374  udp2->src_port = flow_hash2;
375  udp3 = (udp_header_t *)(ip6_3+1);
376  udp3->length = new_l3;
377  udp3->src_port = flow_hash3;
378 
379  /* IPv6 UDP checksum is mandatory */
381  ip6_0, &bogus);
382  if (udp0->checksum == 0)
383  udp0->checksum = 0xffff;
385  ip6_1, &bogus);
386  if (udp1->checksum == 0)
387  udp1->checksum = 0xffff;
389  ip6_2, &bogus);
390  if (udp2->checksum == 0)
391  udp2->checksum = 0xffff;
393  ip6_3, &bogus);
394  if (udp3->checksum == 0)
395  udp3->checksum = 0xffff;
396 
397  /* Fix GTPU length */
398  gtpu0 = (gtpu_header_t *)(udp0+1);
399  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
400  - sizeof (*ip4_0) - sizeof(*udp0));
401  gtpu0->length = new_l0;
402  gtpu1 = (gtpu_header_t *)(udp1+1);
403  new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
404  - sizeof (*ip4_1) - sizeof(*udp1));
405  gtpu1->length = new_l1;
406  gtpu2 = (gtpu_header_t *)(udp2+1);
407  new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
408  - sizeof (*ip4_2) - sizeof(*udp2));
409  gtpu2->length = new_l2;
410  gtpu3 = (gtpu_header_t *)(udp3+1);
411  new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
412  - sizeof (*ip4_3) - sizeof(*udp3));
413  gtpu3->length = new_l3;
414  }
415 
416  pkts_encapsulated += 4;
417  len0 = vlib_buffer_length_in_chain (vm, b0);
418  len1 = vlib_buffer_length_in_chain (vm, b1);
419  len2 = vlib_buffer_length_in_chain (vm, b2);
420  len3 = vlib_buffer_length_in_chain (vm, b3);
421  stats_n_packets += 4;
422  stats_n_bytes += len0 + len1 + len2 + len3;
423 
424  /* Batch stats increment on the same gtpu tunnel so counter is not
425  incremented per packet. Note stats are still incremented for deleted
426  and admin-down tunnel where packets are dropped. It is not worthwhile
427  to check for this rare case and affect normal path performance. */
428  if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
429  (sw_if_index1 != stats_sw_if_index) ||
430  (sw_if_index2 != stats_sw_if_index) ||
431  (sw_if_index3 != stats_sw_if_index) ))
432  {
433  stats_n_packets -= 4;
434  stats_n_bytes -= len0 + len1 + len2 + len3;
435  if ( (sw_if_index0 == sw_if_index1 ) &&
436  (sw_if_index1 == sw_if_index2 ) &&
437  (sw_if_index2 == sw_if_index3 ) )
438  {
439  if (stats_n_packets)
442  thread_index, stats_sw_if_index,
443  stats_n_packets, stats_n_bytes);
444  stats_sw_if_index = sw_if_index0;
445  stats_n_packets = 4;
446  stats_n_bytes = len0 + len1 + len2 + len3;
447  }
448  else
449  {
452  thread_index, sw_if_index0, 1, len0);
455  thread_index, sw_if_index1, 1, len1);
458  thread_index, sw_if_index2, 1, len2);
461  thread_index, sw_if_index3, 1, len3);
462  }
463  }
464 
466  {
467  gtpu_encap_trace_t *tr =
468  vlib_add_trace (vm, node, b0, sizeof (*tr));
469  tr->tunnel_index = t0 - gtm->tunnels;
470  tr->teid = t0->teid;
471  }
472 
474  {
475  gtpu_encap_trace_t *tr =
476  vlib_add_trace (vm, node, b1, sizeof (*tr));
477  tr->tunnel_index = t1 - gtm->tunnels;
478  tr->teid = t1->teid;
479  }
480 
481  vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
482  to_next, n_left_to_next,
483  bi0, bi1, bi2, bi3,
484  next0, next1, next2, next3);
485  }
486 
487  while (n_left_from > 0 && n_left_to_next > 0)
488  {
489  u32 bi0;
490  vlib_buffer_t * b0;
491  u32 flow_hash0;
492  u32 len0;
493  ip4_header_t * ip4_0;
494  ip6_header_t * ip6_0;
495  udp_header_t * udp0;
496  gtpu_header_t * gtpu0;
497  u64 * copy_src0, * copy_dst0;
498  u32 * copy_src_last0, * copy_dst_last0;
499  u16 new_l0;
500  ip_csum_t sum0;
501 
502  bi0 = from[0];
503  to_next[0] = bi0;
504  from += 1;
505  to_next += 1;
506  n_left_from -= 1;
507  n_left_to_next -= 1;
508 
509  b0 = vlib_get_buffer (vm, bi0);
510 
511  flow_hash0 = vnet_l2_compute_flow_hash(b0);
512 
513  /* Get next node index and adj index from tunnel next_dpo */
514  sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
515  hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
516  t0 = &gtm->tunnels[hi0->dev_instance];
517  /* Note: change to always set next0 if it may be set to drop */
518  next0 = t0->next_dpo.dpoi_next_node;
519  vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
520 
521  /* Apply the rewrite string. $$$$ vnet_rewrite? */
522  vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
523 
524  if (is_ip4)
525  {
526  ip4_0 = vlib_buffer_get_current(b0);
527 
528  /* Copy the fixed header */
529  copy_dst0 = (u64 *) ip4_0;
530  copy_src0 = (u64 *) t0->rewrite;
531  /* Copy first 32 octets 8-bytes at a time */
532 #define _(offs) copy_dst0[offs] = copy_src0[offs];
534 #undef _
535  /* Last 4 octets. Hopefully gcc will be our friend */
536  copy_dst_last0 = (u32 *)(&copy_dst0[4]);
537  copy_src_last0 = (u32 *)(&copy_src0[4]);
538  copy_dst_last0[0] = copy_src_last0[0];
539 
540  /* Fix the IP4 checksum and length */
541  sum0 = ip4_0->checksum;
542  new_l0 = /* old_l0 always 0, see the rewrite setup */
543  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
544  sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
545  length /* changed member */);
546  ip4_0->checksum = ip_csum_fold (sum0);
547  ip4_0->length = new_l0;
548 
549  /* Fix UDP length and set source port */
550  udp0 = (udp_header_t *)(ip4_0+1);
551  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
552  - sizeof (*ip4_0));
553  udp0->length = new_l0;
554  udp0->src_port = flow_hash0;
555 
556  /* Fix GTPU length */
557  gtpu0 = (gtpu_header_t *)(udp0+1);
558  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
559  - sizeof (*ip4_0) - sizeof(*udp0));
560  gtpu0->length = new_l0;
561  }
562 
563  else /* ip6 path */
564  {
565  int bogus = 0;
566 
567  ip6_0 = vlib_buffer_get_current(b0);
568  /* Copy the fixed header */
569  copy_dst0 = (u64 *) ip6_0;
570  copy_src0 = (u64 *) t0->rewrite;
571  /* Copy first 56 (ip6) octets 8-bytes at a time */
572 #define _(offs) copy_dst0[offs] = copy_src0[offs];
574 #undef _
575  /* Fix IP6 payload length */
576  new_l0 =
577  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
578  - sizeof(*ip6_0));
579  ip6_0->payload_length = new_l0;
580 
581  /* Fix UDP length and set source port */
582  udp0 = (udp_header_t *)(ip6_0+1);
583  udp0->length = new_l0;
584  udp0->src_port = flow_hash0;
585 
586  /* IPv6 UDP checksum is mandatory */
588  ip6_0, &bogus);
589  if (udp0->checksum == 0)
590  udp0->checksum = 0xffff;
591 
592  /* Fix GTPU length */
593  gtpu0 = (gtpu_header_t *)(udp0+1);
594  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
595  - sizeof (*ip4_0) - sizeof(*udp0));
596  gtpu0->length = new_l0;
597  }
598 
599  pkts_encapsulated ++;
600  len0 = vlib_buffer_length_in_chain (vm, b0);
601  stats_n_packets += 1;
602  stats_n_bytes += len0;
603 
604  /* Batch stats increment on the same gtpu tunnel so counter is not
605  incremented per packet. Note stats are still incremented for deleted
606  and admin-down tunnel where packets are dropped. It is not worthwhile
607  to check for this rare case and affect normal path performance. */
608  if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
609  {
610  stats_n_packets -= 1;
611  stats_n_bytes -= len0;
612  if (stats_n_packets)
615  thread_index, stats_sw_if_index,
616  stats_n_packets, stats_n_bytes);
617  stats_n_packets = 1;
618  stats_n_bytes = len0;
619  stats_sw_if_index = sw_if_index0;
620  }
621 
623  {
624  gtpu_encap_trace_t *tr =
625  vlib_add_trace (vm, node, b0, sizeof (*tr));
626  tr->tunnel_index = t0 - gtm->tunnels;
627  tr->teid = t0->teid;
628  }
629  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
630  to_next, n_left_to_next,
631  bi0, next0);
632  }
633 
634  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
635  }
636 
637  /* Do we still need this now that tunnel tx stats is kept? */
639  GTPU_ENCAP_ERROR_ENCAPSULATED,
640  pkts_encapsulated);
641 
642  /* Increment any remaining batch stats */
643  if (stats_n_packets)
644  {
647  thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
648  node->runtime_data[0] = stats_sw_if_index;
649  }
650 
651  return from_frame->n_vectors;
652 }
653 
654 static uword
656  vlib_node_runtime_t * node,
657  vlib_frame_t * from_frame)
658 {
659  return gtpu_encap_inline (vm, node, from_frame, /* is_ip4 */ 1);
660 }
661 
662 static uword
664  vlib_node_runtime_t * node,
665  vlib_frame_t * from_frame)
666 {
667  return gtpu_encap_inline (vm, node, from_frame, /* is_ip4 */ 0);
668 }
669 
671  .function = gtpu4_encap,
672  .name = "gtpu4-encap",
673  .vector_size = sizeof (u32),
674  .format_trace = format_gtpu_encap_trace,
675  .type = VLIB_NODE_TYPE_INTERNAL,
676  .n_errors = ARRAY_LEN(gtpu_encap_error_strings),
677  .error_strings = gtpu_encap_error_strings,
678  .n_next_nodes = GTPU_ENCAP_N_NEXT,
679  .next_nodes = {
680 #define _(s,n) [GTPU_ENCAP_NEXT_##s] = n,
682 #undef _
683  },
684 };
685 
687 
689  .function = gtpu6_encap,
690  .name = "gtpu6-encap",
691  .vector_size = sizeof (u32),
692  .format_trace = format_gtpu_encap_trace,
693  .type = VLIB_NODE_TYPE_INTERNAL,
694  .n_errors = ARRAY_LEN(gtpu_encap_error_strings),
695  .error_strings = gtpu_encap_error_strings,
696  .n_next_nodes = GTPU_ENCAP_N_NEXT,
697  .next_nodes = {
698 #define _(s,n) [GTPU_ENCAP_NEXT_##s] = n,
700 #undef _
701  },
702 };
703 
705 
static uword gtpu_encap_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame, u32 is_ip4)
Definition: gtpu_encap.c:76
#define CLIB_UNUSED(x)
Definition: clib.h:79
vnet_main_t * vnet_main
Definition: gtpu.h:228
#define foreach_gtpu_encap_next
Definition: gtpu_encap.c:39
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 thread_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:211
u8 runtime_data[0]
Function dependent node-runtime data.
Definition: node.h:464
static vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
u32 teid
Definition: gtpu.h:133
vnet_interface_main_t interface_main
Definition: vnet.h:56
#define NULL
Definition: clib.h:55
#define vlib_validate_buffer_enqueue_x4(vm, node, next_index, to_next, n_left_to_next, bi0, bi1, bi2, bi3, next0, next1, next2, next3)
Finish enqueueing four buffers forward in the graph.
Definition: buffer_node.h:138
static uword gtpu4_encap(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: gtpu_encap.c:655
uword ip_csum_t
Definition: ip_packet.h:90
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
u16 length
Definition: gtpu.h:58
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:107
#define foreach_fixed_header6_offset
Definition: gtpu_encap.c:72
dpo_id_t next_dpo
Definition: gtpu.h:130
#define always_inline
Definition: clib.h:92
gtpu_encap_error_t
Definition: gtpu_encap.c:32
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:672
gtpu_encap_next_t
Definition: gtpu_encap.c:44
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:171
unsigned long u64
Definition: types.h:89
u8 * format_gtpu_encap_trace(u8 *s, va_list *args)
Definition: gtpu_encap.c:56
static u32 vnet_l2_compute_flow_hash(vlib_buffer_t *b)
Definition: l2_input.h:257
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
u32 node_index
Node index.
Definition: node.h:437
#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
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1158
u16 n_vectors
Definition: node.h:344
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:221
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:82
vlib_main_t * vm
Definition: buffer.c:283
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:93
#define ARRAY_LEN(x)
Definition: clib.h:59
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
u16 ip6_tcp_udp_icmp_compute_checksum(vlib_main_t *vm, vlib_buffer_t *p0, ip6_header_t *ip0, int *bogus_lengthp)
Definition: ip6_forward.c:1133
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
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
Definition: defs.h:47
unsigned short u16
Definition: types.h:57
#define foreach_fixed_header4_offset
Definition: gtpu_encap.c:69
u16 payload_length
Definition: ip6_packet.h:332
i64 word
Definition: types.h:111
index_t dpoi_index
the index of objects of that type
Definition: dpo.h:182
unsigned char u8
Definition: types.h:56
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
#define ip_csum_update(sum, old, new, type, field)
Definition: ip_packet.h:139
Bits Octets 8 7 6 5 4 3 2 1 1 Version PT (*) E S PN 2 Message Type 3 Length (1st Octet) 4 Length...
Definition: gtpu.h:54
#define vnet_buffer(b)
Definition: buffer.h:326
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:158
gtpu_main_t gtpu_main
Definition: jvpp_gtpu.h:39
gtpu_tunnel_t * tunnels
Definition: gtpu.h:198
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 data[0]
Packet data.
Definition: buffer.h:159
vlib_node_registration_t gtpu4_encap_node
(constructor) VLIB_REGISTER_NODE (gtpu4_encap_node)
Definition: gtpu_encap.c:670
u8 * rewrite
Definition: gtpu.h:127
static uword gtpu6_encap(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: gtpu_encap.c:663
u16 dpoi_next_node
The next VLIB node to follow.
Definition: dpo.h:178
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:67
static char * gtpu_encap_error_strings[]
Definition: gtpu_encap.c:26
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 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 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:145
vlib_node_registration_t gtpu6_encap_node
(constructor) VLIB_REGISTER_NODE (gtpu6_encap_node)
Definition: gtpu_encap.c:688
#define foreach_gtpu_encap_error
Definition: gtpu_encap.c:23