FD.io VPP  v18.04-17-g3a0d853
Vector Packet Processing
node.c
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #include <vlib/vlib.h>
16 #include <vnet/vnet.h>
17 #include <vppinfra/error.h>
18 #include <srv6-as/as.h>
19 
20 
21 /******************************* Packet tracing *******************************/
22 
23 typedef struct
24 {
27 
28 typedef struct
29 {
33 
34 static u8 *
35 format_srv6_as_localsid_trace (u8 * s, va_list * args)
36 {
37  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
38  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
40 
41  return format (s, "SRv6-AS-localsid: localsid_index %d", t->localsid_index);
42 }
43 
44 static u8 *
45 format_srv6_as_rewrite_trace (u8 * s, va_list * args)
46 {
47  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
48  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
49  srv6_as_rewrite_trace_t *t = va_arg (*args, srv6_as_rewrite_trace_t *);
50 
51  if (PREDICT_FALSE (t->error != 0))
52  {
53  return format (s, "SRv6-AS-rewrite: cache is empty");
54  }
55 
56  return format (s, "SRv6-AS-rewrite: src %U dst %U",
58 }
59 
60 
61 /***************************** Nodes registration *****************************/
62 
65 
66 
67 /****************************** Packet counters *******************************/
68 
69 #define foreach_srv6_as_rewrite_counter \
70 _(PROCESSED, "srv6-as rewritten packets") \
71 _(NO_RW, "(Error) No header for rewriting.")
72 
73 typedef enum
74 {
75 #define _(sym,str) SRV6_AS_REWRITE_COUNTER_##sym,
77 #undef _
80 
82 #define _(sym,string) string,
84 #undef _
85 };
86 
87 
88 /********************************* Next nodes *********************************/
89 
90 typedef enum
91 {
97 
98 typedef enum
99 {
104 
105 
106 /******************************* Local SID node *******************************/
107 
108 /**
109  * @brief Function doing SRH processing for AS behavior
110  */
113  ip6_header_t * ip0,
114  srv6_as_localsid_t * ls0_mem, u32 * next0)
115 {
116  u16 encap_len;
117  ip6_ext_header_t *ext_hdr;
118  u8 hdr_type;
119 
120  /* Compute encapsulation headers length */
121  encap_len = sizeof (ip6_header_t);
122  ext_hdr = (ip6_ext_header_t *) (ip0 + 1);
123  hdr_type = ip0->protocol;
124 
125  while (ip6_ext_hdr (hdr_type))
126  {
127  encap_len += ip6_ext_header_len (ext_hdr);
128  hdr_type = ext_hdr->next_hdr;
129  ext_hdr = ip6_ext_next_header (ext_hdr);
130  }
131 
132  /* Make sure next header is IP */
133  if (PREDICT_FALSE (hdr_type != IP_PROTOCOL_IPV6 &&
134  hdr_type != IP_PROTOCOL_IP_IN_IP))
135  {
136  return;
137  }
138 
139  /* Remove IP header and extensions */
140  vlib_buffer_advance (b0, encap_len);
141 
142  /* Set Xconnect adjacency to VNF */
143  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ls0_mem->nh_adj;
144 
145  if (ls0_mem->ip_version == DA_IP4)
147  else if (ls0_mem->ip_version == DA_IP6)
149 }
150 
151 /**
152  * @brief SRv6 AS Localsid graph node
153  */
154 static uword
156  vlib_node_runtime_t * node, vlib_frame_t * frame)
157 {
158  ip6_sr_main_t *sm = &sr_main;
159  u32 n_left_from, next_index, *from, *to_next;
160  u32 cnt_packets = 0;
161 
162  from = vlib_frame_vector_args (frame);
163  n_left_from = frame->n_vectors;
164  next_index = node->cached_next_index;
165 
166  u32 thread_index = vlib_get_thread_index ();
167 
168  while (n_left_from > 0)
169  {
170  u32 n_left_to_next;
171 
172  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
173 
174  /* TODO: Dual/quad loop */
175 
176  while (n_left_from > 0 && n_left_to_next > 0)
177  {
178  u32 bi0;
179  vlib_buffer_t *b0;
180  ip6_header_t *ip0 = 0;
181  ip6_sr_localsid_t *ls0;
183 
184  bi0 = from[0];
185  to_next[0] = bi0;
186  from += 1;
187  to_next += 1;
188  n_left_from -= 1;
189  n_left_to_next -= 1;
190 
191  b0 = vlib_get_buffer (vm, bi0);
192  ip0 = vlib_buffer_get_current (b0);
193 
194  /* Lookup the SR End behavior based on IP DA (adj) */
195  ls0 = pool_elt_at_index (sm->localsids,
196  vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
197 
198  /* SRH processing */
199  end_as_processing (b0, ip0, ls0->plugin_mem, &next0);
200 
201  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
202  {
204  vlib_add_trace (vm, node, b0, sizeof *tr);
205  tr->localsid_index = ls0 - sm->localsids;
206  }
207 
208  /* This increments the SRv6 per LocalSID counters. */
211  &(sm->sr_ls_invalid_counters) :
212  &(sm->sr_ls_valid_counters)),
213  thread_index, ls0 - sm->localsids,
215  b0));
216 
217  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
218  n_left_to_next, bi0, next0);
219 
220  cnt_packets++;
221  }
222 
223  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
224  }
225 
226  return frame->n_vectors;
227 }
228 
229 /* *INDENT-OFF* */
231  .function = srv6_as_localsid_fn,
232  .name = "srv6-as-localsid",
233  .vector_size = sizeof (u32),
234  .format_trace = format_srv6_as_localsid_trace,
235  .type = VLIB_NODE_TYPE_INTERNAL,
236  .n_next_nodes = SRV6_AS_LOCALSID_N_NEXT,
237  .next_nodes = {
238  [SRV6_AS_LOCALSID_NEXT_REWRITE4] = "ip4-rewrite",
239  [SRV6_AS_LOCALSID_NEXT_REWRITE6] = "ip6-rewrite",
240  [SRV6_AS_LOCALSID_NEXT_ERROR] = "error-drop",
241  },
242 };
243 /* *INDENT-ON* */
244 
245 
246 /******************************* Rewriting node *******************************/
247 
248 /**
249  * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
250  */
251 static uword
253  vlib_node_runtime_t * node, vlib_frame_t * frame)
254 {
255  ip6_sr_main_t *srm = &sr_main;
257  u32 n_left_from, next_index, *from, *to_next;
258  u32 cnt_packets = 0;
259 
260  from = vlib_frame_vector_args (frame);
261  n_left_from = frame->n_vectors;
262  next_index = node->cached_next_index;
263 
264  while (n_left_from > 0)
265  {
266  u32 n_left_to_next;
267 
268  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
269 
270  /* TODO: Dual/quad loop */
271 
272  while (n_left_from > 0 && n_left_to_next > 0)
273  {
274  u32 bi0;
275  vlib_buffer_t *b0;
276  ip4_header_t *ip0_encap = 0;
277  ip6_header_t *ip0 = 0;
278  ip6_sr_localsid_t *ls0;
279  srv6_as_localsid_t *ls0_mem;
281  u16 new_l0 = 0;
282 
283  bi0 = from[0];
284  to_next[0] = bi0;
285  from += 1;
286  to_next += 1;
287  n_left_from -= 1;
288  n_left_to_next -= 1;
289 
290  b0 = vlib_get_buffer (vm, bi0);
291  ip0_encap = vlib_buffer_get_current (b0);
292  ls0 = pool_elt_at_index (srm->localsids,
294  (b0)->sw_if_index
295  [VLIB_RX]]);
296  ls0_mem = ls0->plugin_mem;
297 
298  if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
299  {
301  b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
302  }
303  else
304  {
306  (vec_len (ls0_mem->rewrite) + b0->current_data));
307 
308  clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
309  ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
310  vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
311 
312  ip0 = vlib_buffer_get_current (b0);
313 
314  /* Update inner IPv4 TTL and checksum */
315  u32 checksum0;
316  ip0_encap->ttl -= 1;
317  checksum0 = ip0_encap->checksum + clib_host_to_net_u16 (0x0100);
318  checksum0 += checksum0 >= 0xffff;
319  ip0_encap->checksum = checksum0;
320 
321  /* Update outer IPv6 length (in case it has changed) */
322  new_l0 = vec_len (ls0_mem->rewrite) - sizeof (ip6_header_t) +
323  clib_net_to_host_u16 (ip0_encap->length);
324  ip0->payload_length = clib_host_to_net_u16 (new_l0);
325  }
326 
327  if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
328  PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
329  {
331  vlib_add_trace (vm, node, b0, sizeof *tr);
332  tr->error = 0;
333 
334  if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
335  {
336  tr->error = 1;
337  }
338  else
339  {
341  sizeof tr->src.as_u8);
343  sizeof tr->dst.as_u8);
344  }
345  }
346 
347  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
348  n_left_to_next, bi0, next0);
349 
350  cnt_packets++;
351  }
352 
353  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
354  }
355 
356  /* Update counters */
358  SRV6_AS_REWRITE_COUNTER_PROCESSED,
359  cnt_packets);
360 
361  return frame->n_vectors;
362 }
363 
364 /* *INDENT-OFF* */
366  .function = srv6_as4_rewrite_fn,
367  .name = "srv6-as4-rewrite",
368  .vector_size = sizeof (u32),
369  .format_trace = format_srv6_as_rewrite_trace,
370  .type = VLIB_NODE_TYPE_INTERNAL,
371  .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
372  .error_strings = srv6_as_rewrite_counter_strings,
373  .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
374  .next_nodes = {
375  [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
376  [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
377  },
378 };
379 /* *INDENT-ON* */
380 
381 
382 /**
383  * @brief Graph node for applying a SR policy into an IPv6 packet. Encapsulation
384  */
385 static uword
387  vlib_node_runtime_t * node, vlib_frame_t * frame)
388 {
389  ip6_sr_main_t *srm = &sr_main;
391  u32 n_left_from, next_index, *from, *to_next;
392  u32 cnt_packets = 0;
393 
394  from = vlib_frame_vector_args (frame);
395  n_left_from = frame->n_vectors;
396  next_index = node->cached_next_index;
397 
398  while (n_left_from > 0)
399  {
400  u32 n_left_to_next;
401 
402  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
403 
404  /* TODO: Dual/quad loop */
405 
406  while (n_left_from > 0 && n_left_to_next > 0)
407  {
408  u32 bi0;
409  vlib_buffer_t *b0;
410  ip6_header_t *ip0 = 0, *ip0_encap = 0;
411  ip6_sr_localsid_t *ls0;
412  srv6_as_localsid_t *ls0_mem;
414  u16 new_l0 = 0;
415 
416  bi0 = from[0];
417  to_next[0] = bi0;
418  from += 1;
419  to_next += 1;
420  n_left_from -= 1;
421  n_left_to_next -= 1;
422 
423  b0 = vlib_get_buffer (vm, bi0);
424  ip0_encap = vlib_buffer_get_current (b0);
425  ls0 = pool_elt_at_index (srm->localsids,
427  (b0)->sw_if_index
428  [VLIB_RX]]);
429  ls0_mem = ls0->plugin_mem;
430 
431  if (PREDICT_FALSE (ls0_mem == NULL || ls0_mem->rewrite == NULL))
432  {
434  b0->error = node->errors[SRV6_AS_REWRITE_COUNTER_NO_RW];
435  }
436  else
437  {
439  (vec_len (ls0_mem->rewrite) + b0->current_data));
440 
441  clib_memcpy (((u8 *) ip0_encap) - vec_len (ls0_mem->rewrite),
442  ls0_mem->rewrite, vec_len (ls0_mem->rewrite));
443  vlib_buffer_advance (b0, -(word) vec_len (ls0_mem->rewrite));
444 
445  ip0 = vlib_buffer_get_current (b0);
446 
447  /* Update inner IPv6 hop limit */
448  ip0_encap->hop_limit -= 1;
449 
450  /* Update outer IPv6 length (in case it has changed) */
451  new_l0 = vec_len (ls0_mem->rewrite) +
452  clib_net_to_host_u16 (ip0_encap->payload_length);
453  ip0->payload_length = clib_host_to_net_u16 (new_l0);
454  }
455 
456  if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
457  PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
458  {
460  vlib_add_trace (vm, node, b0, sizeof *tr);
461  tr->error = 0;
462 
463  if (next0 == SRV6_AS_REWRITE_NEXT_ERROR)
464  {
465  tr->error = 1;
466  }
467  else
468  {
470  sizeof tr->src.as_u8);
472  sizeof tr->dst.as_u8);
473  }
474  }
475 
476  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
477  n_left_to_next, bi0, next0);
478 
479  cnt_packets++;
480  }
481 
482  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
483  }
484 
485  /* Update counters */
487  SRV6_AS_REWRITE_COUNTER_PROCESSED,
488  cnt_packets);
489 
490  return frame->n_vectors;
491 }
492 
493 /* *INDENT-OFF* */
495  .function = srv6_as6_rewrite_fn,
496  .name = "srv6-as6-rewrite",
497  .vector_size = sizeof (u32),
498  .format_trace = format_srv6_as_rewrite_trace,
499  .type = VLIB_NODE_TYPE_INTERNAL,
500  .n_errors = SRV6_AS_REWRITE_N_COUNTERS,
501  .error_strings = srv6_as_rewrite_counter_strings,
502  .n_next_nodes = SRV6_AS_REWRITE_N_NEXT,
503  .next_nodes = {
504  [SRV6_AS_REWRITE_NEXT_LOOKUP] = "ip6-lookup",
505  [SRV6_AS_REWRITE_NEXT_ERROR] = "error-drop",
506  },
507 };
508 /* *INDENT-ON* */
509 
510 /*
511 * fd.io coding-style-patch-verification: ON
512 *
513 * Local Variables:
514 * eval: (c-set-style "gnu")
515 * End:
516 */
ip6_sr_main_t sr_main
Definition: sr.c:31
#define CLIB_UNUSED(x)
Definition: clib.h:79
static_always_inline void end_as_processing(vlib_buffer_t *b0, ip6_header_t *ip0, srv6_as_localsid_t *ls0_mem, u32 *next0)
Function doing SRH processing for AS behavior.
Definition: node.c:112
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
SR LocalSID.
Definition: sr.h:102
u32 * sw_iface_localsid4
Retrieve local SID from iface.
Definition: as.h:40
vlib_node_registration_t srv6_as_localsid_node
(constructor) VLIB_REGISTER_NODE (srv6_as_localsid_node)
Definition: node.c:230
u8 as_u8[16]
Definition: ip6_packet.h:48
srv6_as_main_t srv6_as_main
Definition: as.h:62
#define NULL
Definition: clib.h:55
srv6_as_rewrite_counters
Definition: node.c:73
#define VLIB_BUFFER_PRE_DATA_SIZE
Definition: buffer.h:52
static uword srv6_as6_rewrite_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Graph node for applying a SR policy into an IPv6 packet.
Definition: node.c:386
u8 ip_version
Definition: as.h:53
static void * ip6_ext_next_header(ip6_ext_header_t *ext_hdr)
Definition: ip6_packet.h:489
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:415
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
vlib_combined_counter_main_t sr_ls_invalid_counters
Definition: sr.h:229
vlib_combined_counter_main_t sr_ls_valid_counters
Definition: sr.h:228
ip6_address_t src_address
Definition: ip6_packet.h:342
#define DA_IP4
Definition: ad.h:26
static uword srv6_as_localsid_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
SRv6 AS Localsid graph node.
Definition: node.c:155
i16 current_data
signed offset in data[], pre_data[] that we are currently processing.
Definition: buffer.h:104
#define static_always_inline
Definition: clib.h:93
#define DA_IP6
Definition: ad.h:27
vlib_node_registration_t srv6_as6_rewrite_node
(constructor) VLIB_REGISTER_NODE (srv6_as6_rewrite_node)
Definition: node.c:64
srv6_as_localsid_next_t
Definition: node.c:90
u32 nh_adj
Adjacency index for out.
Definition: as.h:52
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:461
#define foreach_srv6_as_rewrite_counter
Definition: node.c:69
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:209
#define PREDICT_FALSE(x)
Definition: clib.h:105
static u8 * format_srv6_as_rewrite_trace(u8 *s, va_list *args)
Definition: node.c:45
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:218
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:364
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:130
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1166
#define ip6_ext_header_len(p)
Definition: ip6_packet.h:485
ip6_sr_localsid_t * localsids
Definition: sr.h:204
vlib_node_registration_t srv6_as4_rewrite_node
(constructor) VLIB_REGISTER_NODE (srv6_as4_rewrite_node)
Definition: node.c:63
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u16 n_vectors
Definition: node.h:344
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:221
u8 * rewrite
Headers to be rewritten.
Definition: as.h:56
format_function_t format_ip6_address
Definition: format.h:95
vlib_main_t * vm
Definition: buffer.c:294
#define clib_memcpy(a, b, c)
Definition: string.h:75
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:454
static u8 ip6_ext_hdr(u8 nexthdr)
Definition: ip6_packet.h:473
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:456
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
void * plugin_mem
Memory to be used by the plugin callback functions.
Definition: sr.h:124
static u8 * format_srv6_as_localsid_trace(u8 *s, va_list *args)
Definition: node.c:35
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:222
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
struct _vlib_node_registration vlib_node_registration_t
Definition: defs.h:47
unsigned short u16
Definition: types.h:57
u16 payload_length
Definition: ip6_packet.h:333
i64 word
Definition: types.h:111
static char * srv6_as_rewrite_counter_strings[]
Definition: node.c:81
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
srv6_as_rewrite_next_t
Definition: node.c:98
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:267
u32 * sw_iface_localsid6
Retrieve local SID from iface.
Definition: as.h:41
#define vnet_buffer(b)
Definition: buffer.h:372
ip6_address_t src
Definition: node.c:31
Segment Routing main datastructure.
Definition: sr.h:189
u16 flags
Copy of main node flags.
Definition: node.h:450
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:259
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:111
static uword srv6_as4_rewrite_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Graph node for applying a SR policy into an IPv6 packet.
Definition: node.c:252
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
ip6_address_t dst
Definition: node.c:31
Definition: defs.h:46
ip6_address_t dst_address
Definition: ip6_packet.h:342