FD.io VPP  v18.10-34-gcce845e
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,
28  foreach_gtpu_encap_error
29 #undef _
30 };
31 
32 typedef enum {
33 #define _(sym,str) GTPU_ENCAP_ERROR_##sym,
34  foreach_gtpu_encap_error
35 #undef _
36  GTPU_ENCAP_N_ERROR,
37 } gtpu_encap_error_t;
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 {
45  GTPU_ENCAP_NEXT_DROP,
46  GTPU_ENCAP_NEXT_IP4_LOOKUP,
47  GTPU_ENCAP_NEXT_IP6_LOOKUP,
48  GTPU_ENCAP_N_NEXT,
49 } gtpu_encap_next_t;
50 
51 typedef struct {
52  u32 tunnel_index;
53  u32 teid;
54 } gtpu_encap_trace_t;
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 *);
60  gtpu_encap_trace_t * 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 
75 always_inline uword
76 gtpu_encap_inline (vlib_main_t * vm,
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;
84  vnet_interface_main_t * im = &vnm->interface_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 
143  CLIB_PREFETCH (p4->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
144  CLIB_PREFETCH (p5->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
145  CLIB_PREFETCH (p6->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
146  CLIB_PREFETCH (p7->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
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];
221  foreach_fixed_header4_offset;
222 #undef _
223 #define _(offs) copy_dst1[offs] = copy_src1[offs];
224  foreach_fixed_header4_offset;
225 #undef _
226 #define _(offs) copy_dst2[offs] = copy_src2[offs];
227  foreach_fixed_header4_offset;
228 #undef _
229 #define _(offs) copy_dst3[offs] = copy_src3[offs];
230  foreach_fixed_header4_offset;
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  - GTPU_V1_HDR_LEN);
303  gtpu0->length = new_l0;
304  gtpu1 = (gtpu_header_t *)(udp1+1);
305  new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
306  - sizeof (*ip4_1) - sizeof(*udp1)
307  - GTPU_V1_HDR_LEN);
308  gtpu1->length = new_l1;
309  gtpu2 = (gtpu_header_t *)(udp2+1);
310  new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
311  - sizeof (*ip4_2) - sizeof(*udp2)
312  - GTPU_V1_HDR_LEN);
313  gtpu2->length = new_l2;
314  gtpu3 = (gtpu_header_t *)(udp3+1);
315  new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
316  - sizeof (*ip4_3) - sizeof(*udp3)
317  - GTPU_V1_HDR_LEN);
318  gtpu3->length = new_l3;
319  }
320  else /* ipv6 */
321  {
322  int bogus = 0;
323 
324  ip6_0 = vlib_buffer_get_current(b0);
325  ip6_1 = vlib_buffer_get_current(b1);
326  ip6_2 = vlib_buffer_get_current(b2);
327  ip6_3 = vlib_buffer_get_current(b3);
328 
329  /* Copy the fixed header */
330  copy_dst0 = (u64 *) ip6_0;
331  copy_src0 = (u64 *) t0->rewrite;
332  copy_dst1 = (u64 *) ip6_1;
333  copy_src1 = (u64 *) t1->rewrite;
334  copy_dst2 = (u64 *) ip6_2;
335  copy_src2 = (u64 *) t2->rewrite;
336  copy_dst3 = (u64 *) ip6_3;
337  copy_src3 = (u64 *) t3->rewrite;
338  /* Copy first 56 (ip6) octets 8-bytes at a time */
339 #define _(offs) copy_dst0[offs] = copy_src0[offs];
340  foreach_fixed_header6_offset;
341 #undef _
342 #define _(offs) copy_dst1[offs] = copy_src1[offs];
343  foreach_fixed_header6_offset;
344 #undef _
345 #define _(offs) copy_dst2[offs] = copy_src2[offs];
346  foreach_fixed_header6_offset;
347 #undef _
348 #define _(offs) copy_dst3[offs] = copy_src3[offs];
349  foreach_fixed_header6_offset;
350 #undef _
351  /* Fix IP6 payload length */
352  new_l0 =
353  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
354  - sizeof(*ip6_0));
355  ip6_0->payload_length = new_l0;
356  new_l1 =
357  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
358  - sizeof(*ip6_1));
359  ip6_1->payload_length = new_l1;
360  new_l2 =
361  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b2)
362  - sizeof(*ip6_2));
363  ip6_2->payload_length = new_l2;
364  new_l3 =
365  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b3)
366  - sizeof(*ip6_3));
367  ip6_3->payload_length = new_l3;
368 
369  /* Fix UDP length and set source port */
370  udp0 = (udp_header_t *)(ip6_0+1);
371  udp0->length = new_l0;
372  udp0->src_port = flow_hash0;
373  udp1 = (udp_header_t *)(ip6_1+1);
374  udp1->length = new_l1;
375  udp1->src_port = flow_hash1;
376  udp2 = (udp_header_t *)(ip6_2+1);
377  udp2->length = new_l2;
378  udp2->src_port = flow_hash2;
379  udp3 = (udp_header_t *)(ip6_3+1);
380  udp3->length = new_l3;
381  udp3->src_port = flow_hash3;
382 
383  /* Fix GTPU length */
384  gtpu0 = (gtpu_header_t *)(udp0+1);
385  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
386  - sizeof (*ip6_0) - sizeof(*udp0)
387  - GTPU_V1_HDR_LEN);
388  gtpu0->length = new_l0;
389  gtpu1 = (gtpu_header_t *)(udp1+1);
390  new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
391  - sizeof (*ip6_1) - sizeof(*udp1)
392  - GTPU_V1_HDR_LEN);
393  gtpu1->length = new_l1;
394  gtpu2 = (gtpu_header_t *)(udp2+1);
395  new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
396  - sizeof (*ip6_2) - sizeof(*udp2)
397  - GTPU_V1_HDR_LEN);
398  gtpu2->length = new_l2;
399  gtpu3 = (gtpu_header_t *)(udp3+1);
400  new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
401  - sizeof (*ip6_3) - sizeof(*udp3)
402  - GTPU_V1_HDR_LEN);
403  gtpu3->length = new_l3;
404 
405  /* IPv6 UDP checksum is mandatory */
406  udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0,
407  ip6_0, &bogus);
408  if (udp0->checksum == 0)
409  udp0->checksum = 0xffff;
410  udp1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b1,
411  ip6_1, &bogus);
412  if (udp1->checksum == 0)
413  udp1->checksum = 0xffff;
414  udp2->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b2,
415  ip6_2, &bogus);
416  if (udp2->checksum == 0)
417  udp2->checksum = 0xffff;
418  udp3->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b3,
419  ip6_3, &bogus);
420  if (udp3->checksum == 0)
421  udp3->checksum = 0xffff;
422 
423  }
424 
425  pkts_encapsulated += 4;
426  len0 = vlib_buffer_length_in_chain (vm, b0);
427  len1 = vlib_buffer_length_in_chain (vm, b1);
428  len2 = vlib_buffer_length_in_chain (vm, b2);
429  len3 = vlib_buffer_length_in_chain (vm, b3);
430  stats_n_packets += 4;
431  stats_n_bytes += len0 + len1 + len2 + len3;
432 
433  /* Batch stats increment on the same gtpu tunnel so counter is not
434  incremented per packet. Note stats are still incremented for deleted
435  and admin-down tunnel where packets are dropped. It is not worthwhile
436  to check for this rare case and affect normal path performance. */
437  if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
438  (sw_if_index1 != stats_sw_if_index) ||
439  (sw_if_index2 != stats_sw_if_index) ||
440  (sw_if_index3 != stats_sw_if_index) ))
441  {
442  stats_n_packets -= 4;
443  stats_n_bytes -= len0 + len1 + len2 + len3;
444  if ( (sw_if_index0 == sw_if_index1 ) &&
445  (sw_if_index1 == sw_if_index2 ) &&
446  (sw_if_index2 == sw_if_index3 ) )
447  {
448  if (stats_n_packets)
449  vlib_increment_combined_counter
450  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
451  thread_index, stats_sw_if_index,
452  stats_n_packets, stats_n_bytes);
453  stats_sw_if_index = sw_if_index0;
454  stats_n_packets = 4;
455  stats_n_bytes = len0 + len1 + len2 + len3;
456  }
457  else
458  {
459  vlib_increment_combined_counter
460  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
461  thread_index, sw_if_index0, 1, len0);
462  vlib_increment_combined_counter
463  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
464  thread_index, sw_if_index1, 1, len1);
465  vlib_increment_combined_counter
466  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
467  thread_index, sw_if_index2, 1, len2);
468  vlib_increment_combined_counter
469  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
470  thread_index, sw_if_index3, 1, len3);
471  }
472  }
473 
474  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
475  {
476  gtpu_encap_trace_t *tr =
477  vlib_add_trace (vm, node, b0, sizeof (*tr));
478  tr->tunnel_index = t0 - gtm->tunnels;
479  tr->teid = t0->teid;
480  }
481 
482  if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
483  {
484  gtpu_encap_trace_t *tr =
485  vlib_add_trace (vm, node, b1, sizeof (*tr));
486  tr->tunnel_index = t1 - gtm->tunnels;
487  tr->teid = t1->teid;
488  }
489 
490  vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
491  to_next, n_left_to_next,
492  bi0, bi1, bi2, bi3,
493  next0, next1, next2, next3);
494  }
495 
496  while (n_left_from > 0 && n_left_to_next > 0)
497  {
498  u32 bi0;
499  vlib_buffer_t * b0;
500  u32 flow_hash0;
501  u32 len0;
502  ip4_header_t * ip4_0;
503  ip6_header_t * ip6_0;
504  udp_header_t * udp0;
505  gtpu_header_t * gtpu0;
506  u64 * copy_src0, * copy_dst0;
507  u32 * copy_src_last0, * copy_dst_last0;
508  u16 new_l0;
509  ip_csum_t sum0;
510 
511  bi0 = from[0];
512  to_next[0] = bi0;
513  from += 1;
514  to_next += 1;
515  n_left_from -= 1;
516  n_left_to_next -= 1;
517 
518  b0 = vlib_get_buffer (vm, bi0);
519 
520  flow_hash0 = vnet_l2_compute_flow_hash(b0);
521 
522  /* Get next node index and adj index from tunnel next_dpo */
523  sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
524  hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
525  t0 = &gtm->tunnels[hi0->dev_instance];
526  /* Note: change to always set next0 if it may be set to drop */
527  next0 = t0->next_dpo.dpoi_next_node;
528  vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
529 
530  /* Apply the rewrite string. $$$$ vnet_rewrite? */
531  vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
532 
533  if (is_ip4)
534  {
535  ip4_0 = vlib_buffer_get_current(b0);
536 
537  /* Copy the fixed header */
538  copy_dst0 = (u64 *) ip4_0;
539  copy_src0 = (u64 *) t0->rewrite;
540  /* Copy first 32 octets 8-bytes at a time */
541 #define _(offs) copy_dst0[offs] = copy_src0[offs];
542  foreach_fixed_header4_offset;
543 #undef _
544  /* Last 4 octets. Hopefully gcc will be our friend */
545  copy_dst_last0 = (u32 *)(&copy_dst0[4]);
546  copy_src_last0 = (u32 *)(&copy_src0[4]);
547  copy_dst_last0[0] = copy_src_last0[0];
548 
549  /* Fix the IP4 checksum and length */
550  sum0 = ip4_0->checksum;
551  new_l0 = /* old_l0 always 0, see the rewrite setup */
552  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
553  sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
554  length /* changed member */);
555  ip4_0->checksum = ip_csum_fold (sum0);
556  ip4_0->length = new_l0;
557 
558  /* Fix UDP length and set source port */
559  udp0 = (udp_header_t *)(ip4_0+1);
560  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
561  - sizeof (*ip4_0));
562  udp0->length = new_l0;
563  udp0->src_port = flow_hash0;
564 
565  /* Fix GTPU length */
566  gtpu0 = (gtpu_header_t *)(udp0+1);
567  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
568  - sizeof (*ip4_0) - sizeof(*udp0)
569  - GTPU_V1_HDR_LEN);
570  gtpu0->length = new_l0;
571  }
572 
573  else /* ip6 path */
574  {
575  int bogus = 0;
576 
577  ip6_0 = vlib_buffer_get_current(b0);
578  /* Copy the fixed header */
579  copy_dst0 = (u64 *) ip6_0;
580  copy_src0 = (u64 *) t0->rewrite;
581  /* Copy first 56 (ip6) octets 8-bytes at a time */
582 #define _(offs) copy_dst0[offs] = copy_src0[offs];
583  foreach_fixed_header6_offset;
584 #undef _
585  /* Fix IP6 payload length */
586  new_l0 =
587  clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
588  - sizeof(*ip6_0));
589  ip6_0->payload_length = new_l0;
590 
591  /* Fix UDP length and set source port */
592  udp0 = (udp_header_t *)(ip6_0+1);
593  udp0->length = new_l0;
594  udp0->src_port = flow_hash0;
595 
596  /* Fix GTPU length */
597  gtpu0 = (gtpu_header_t *)(udp0+1);
598  new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
599  - sizeof (*ip4_0) - sizeof(*udp0)
600  - GTPU_V1_HDR_LEN);
601  gtpu0->length = new_l0;
602 
603  /* IPv6 UDP checksum is mandatory */
604  udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0,
605  ip6_0, &bogus);
606  if (udp0->checksum == 0)
607  udp0->checksum = 0xffff;
608  }
609 
610  pkts_encapsulated ++;
611  len0 = vlib_buffer_length_in_chain (vm, b0);
612  stats_n_packets += 1;
613  stats_n_bytes += len0;
614 
615  /* Batch stats increment on the same gtpu tunnel so counter is not
616  incremented per packet. Note stats are still incremented for deleted
617  and admin-down tunnel where packets are dropped. It is not worthwhile
618  to check for this rare case and affect normal path performance. */
619  if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
620  {
621  stats_n_packets -= 1;
622  stats_n_bytes -= len0;
623  if (stats_n_packets)
624  vlib_increment_combined_counter
625  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
626  thread_index, stats_sw_if_index,
627  stats_n_packets, stats_n_bytes);
628  stats_n_packets = 1;
629  stats_n_bytes = len0;
630  stats_sw_if_index = sw_if_index0;
631  }
632 
633  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
634  {
635  gtpu_encap_trace_t *tr =
636  vlib_add_trace (vm, node, b0, sizeof (*tr));
637  tr->tunnel_index = t0 - gtm->tunnels;
638  tr->teid = t0->teid;
639  }
640  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
641  to_next, n_left_to_next,
642  bi0, next0);
643  }
644 
645  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
646  }
647 
648  /* Do we still need this now that tunnel tx stats is kept? */
649  vlib_node_increment_counter (vm, node->node_index,
650  GTPU_ENCAP_ERROR_ENCAPSULATED,
651  pkts_encapsulated);
652 
653  /* Increment any remaining batch stats */
654  if (stats_n_packets)
655  {
656  vlib_increment_combined_counter
657  (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
658  thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
659  node->runtime_data[0] = stats_sw_if_index;
660  }
661 
662  return from_frame->n_vectors;
663 }
664 
665 static uword
666 gtpu4_encap (vlib_main_t * vm,
667  vlib_node_runtime_t * node,
668  vlib_frame_t * from_frame)
669 {
670  return gtpu_encap_inline (vm, node, from_frame, /* is_ip4 */ 1);
671 }
672 
673 static uword
674 gtpu6_encap (vlib_main_t * vm,
675  vlib_node_runtime_t * node,
676  vlib_frame_t * from_frame)
677 {
678  return gtpu_encap_inline (vm, node, from_frame, /* is_ip4 */ 0);
679 }
680 
681 VLIB_REGISTER_NODE (gtpu4_encap_node) = {
682  .function = gtpu4_encap,
683  .name = "gtpu4-encap",
684  .vector_size = sizeof (u32),
685  .format_trace = format_gtpu_encap_trace,
686  .type = VLIB_NODE_TYPE_INTERNAL,
687  .n_errors = ARRAY_LEN(gtpu_encap_error_strings),
688  .error_strings = gtpu_encap_error_strings,
689  .n_next_nodes = GTPU_ENCAP_N_NEXT,
690  .next_nodes = {
691 #define _(s,n) [GTPU_ENCAP_NEXT_##s] = n,
692  foreach_gtpu_encap_next
693 #undef _
694  },
695 };
696 
697 VLIB_NODE_FUNCTION_MULTIARCH (gtpu4_encap_node, gtpu4_encap)
698 
699 VLIB_REGISTER_NODE (gtpu6_encap_node) = {
700  .function = gtpu6_encap,
701  .name = "gtpu6-encap",
702  .vector_size = sizeof (u32),
703  .format_trace = format_gtpu_encap_trace,
704  .type = VLIB_NODE_TYPE_INTERNAL,
705  .n_errors = ARRAY_LEN(gtpu_encap_error_strings),
706  .error_strings = gtpu_encap_error_strings,
707  .n_next_nodes = GTPU_ENCAP_N_NEXT,
708  .next_nodes = {
709 #define _(s,n) [GTPU_ENCAP_NEXT_##s] = n,
710  foreach_gtpu_encap_next
711 #undef _
712  },
713 };
714 
715 VLIB_NODE_FUNCTION_MULTIARCH (gtpu6_encap_node, gtpu6_encap)
716 
gtpu_encap_inline
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
vnet_interface_main_t
Definition: interface.h:829
CLIB_UNUSED
#define CLIB_UNUSED(x)
Definition: clib.h:81
gtpu_main_t::vnet_main
vnet_main_t * vnet_main
Definition: gtpu.h:233
foreach_gtpu_encap_next
#define foreach_gtpu_encap_next
Definition: gtpu_encap.c:39
GTPU_V1_HDR_LEN
#define GTPU_V1_HDR_LEN
Definition: gtpu.h:65
vlib_increment_combined_counter
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:204
vlib_node_runtime_t::runtime_data
u8 runtime_data[0]
Function dependent node-runtime data.
Definition: node.h:521
vnet_get_sup_hw_interface
static vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
Definition: interface_funcs.h:92
GTPU_ENCAP_N_NEXT
Definition: gtpu_encap.c:48
gtpu_tunnel_t::teid
u32 teid
Definition: gtpu.h:138
vnet_main_t::interface_main
vnet_interface_main_t interface_main
Definition: vnet.h:56
GTPU_ENCAP_NEXT_DROP
Definition: gtpu_encap.c:45
u64
unsigned long u64
Definition: types.h:89
NULL
#define NULL
Definition: clib.h:57
vlib_validate_buffer_enqueue_x4
#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
gtpu4_encap
static uword gtpu4_encap(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: gtpu_encap.c:666
ip_csum_t
uword ip_csum_t
Definition: ip_packet.h:181
GTPU_ENCAP_NEXT_IP6_LOOKUP
Definition: gtpu_encap.c:47
format
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
gtpu_header_t::length
u16 length
Definition: gtpu.h:58
vlib_buffer_length_in_chain
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:263
udp_header_t
Definition: udp_packet.h:43
u8
unsigned char u8
Definition: types.h:56
vlib_frame_t
Definition: node.h:386
foreach_fixed_header6_offset
#define foreach_fixed_header6_offset
Definition: gtpu_encap.c:72
vlib_node_runtime_t
Definition: node.h:466
udp_header_t::src_port
u16 src_port
Definition: udp_packet.h:46
gtpu_tunnel_t::next_dpo
dpo_id_t next_dpo
Definition: gtpu.h:135
word
i64 word
Definition: types.h:111
always_inline
#define always_inline
Definition: clib.h:94
gtpu_encap_error_t
gtpu_encap_error_t
Definition: gtpu_encap.c:32
vnet_interface_main_t::combined_sw_if_counters
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:855
gtpu_encap_next_t
gtpu_encap_next_t
Definition: gtpu_encap.c:44
vnet_hw_interface_t::dev_instance
u32 dev_instance
Definition: interface.h:547
vlib_prefetch_buffer_header
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:187
u32
unsigned int u32
Definition: types.h:88
gtpu_main
gtpu_main_t gtpu_main
Definition: gtpu.c:35
GTPU_ENCAP_N_ERROR
Definition: gtpu_encap.c:36
format_gtpu_encap_trace
u8 * format_gtpu_encap_trace(u8 *s, va_list *args)
Definition: gtpu_encap.c:56
VLIB_NODE_FUNCTION_MULTIARCH
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:209
u16
unsigned short u16
Definition: types.h:57
vnet_l2_compute_flow_hash
static u32 vnet_l2_compute_flow_hash(vlib_buffer_t *b)
Definition: l2_input.h:261
vlib_buffer_get_current
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:205
PREDICT_FALSE
#define PREDICT_FALSE(x)
Definition: clib.h:107
vlib_node_runtime_t::node_index
u32 node_index
Node index.
Definition: node.h:494
vlib_validate_buffer_enqueue_x1
#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
vlib_get_next_frame
#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_increment_counter
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1176
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u16 length
Definition: ip4_packet.h:143
gtpu_encap_trace_t
Definition: gtpu_encap.c:51
ip4_header_t::checksum
u16 checksum
Definition: ip4_packet.h:162
VLIB_REGISTER_NODE
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:155
vlib_frame_t::n_vectors
u16 n_vectors
Definition: node.h:401
vlib_get_thread_index
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:211
CLIB_PREFETCH
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:79
vm
vlib_main_t * vm
Definition: buffer.c:294
vnet_hw_interface_t
Definition: interface.h:487
vlib_buffer_t
Definition: buffer.h:103
ARRAY_LEN
#define ARRAY_LEN(x)
Definition: clib.h:61
vlib_put_next_frame
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:455
gtpu_tunnel_t
Definition: gtpu.h:126
gtpu_main_t
Definition: gtpu.h:200
vnet_main_t
Definition: vnet.h:51
ip6_tcp_udp_icmp_compute_checksum
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:910
vlib_node_runtime_t::cached_next_index
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:513
ip6_header_t
Definition: ip6_packet.h:362
vlib_buffer_advance
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:218
vlib_add_trace
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
gtpu_encap_trace_t::tunnel_index
u32 tunnel_index
Definition: gtpu_encap.c:52
udp_header_t::checksum
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Definition: udp_packet.h:53
VLIB_TX
Definition: defs.h:47
foreach_fixed_header4_offset
#define foreach_fixed_header4_offset
Definition: gtpu_encap.c:69
ip6_header_t::payload_length
u16 payload_length
Definition: ip6_packet.h:369
dpo_id_t_::dpoi_index
index_t dpoi_index
the index of objects of that type
Definition: dpo.h:184
vlib_main_t
Definition: main.h:59
uword
u64 uword
Definition: types.h:112
vlib_node_t
Definition: node.h:266
vlib_frame_vector_args
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
ip_csum_update
#define ip_csum_update(sum, old, new, type, field)
Definition: ip_packet.h:231
gtpu_header_t
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
vnet_buffer
#define vnet_buffer(b)
Definition: buffer.h:344
gtpu_main_t::tunnels
gtpu_tunnel_t * tunnels
Definition: gtpu.h:203
vlib_buffer_t::data
u8 data[0]
Packet data.
Definition: buffer.h:175
gtpu4_encap_node
vlib_node_registration_t gtpu4_encap_node
(constructor) VLIB_REGISTER_NODE (gtpu4_encap_node)
Definition: gtpu_encap.c:681
gtpu_tunnel_t::rewrite
u8 * rewrite
Definition: gtpu.h:132
udp_header_t::length
u16 length
Definition: udp_packet.h:49
gtpu6_encap
static uword gtpu6_encap(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: gtpu_encap.c:674
dpo_id_t_::dpoi_next_node
u16 dpoi_next_node
The next VLIB node to follow.
Definition: dpo.h:180
CLIB_CACHE_LINE_BYTES
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:59
gtpu_encap_error_strings
static char * gtpu_encap_error_strings[]
Definition: gtpu_encap.c:26
vlib_buffer_t::flags
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:116
ip4_header_t
Definition: ip4_packet.h:131
gtpu_encap_trace_t::teid
u32 teid
Definition: gtpu_encap.c:53
vlib_get_buffer
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:58
ip_csum_fold
static u16 ip_csum_fold(ip_csum_t c)
Definition: ip_packet.h:237
gtpu6_encap_node
vlib_node_registration_t gtpu6_encap_node
(constructor) VLIB_REGISTER_NODE (gtpu6_encap_node)
Definition: gtpu_encap.c:699
GTPU_ENCAP_NEXT_IP4_LOOKUP
Definition: gtpu_encap.c:46
foreach_gtpu_encap_error
#define foreach_gtpu_encap_error
Definition: gtpu_encap.c:23