nsh_pop.c revision 65e71d32
1/*
2 * nsh_pop.c - nsh POP only processing
3 *
4 * Copyright (c) 2017 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#include <vnet/gre/gre.h>
22#include <vnet/vxlan/vxlan.h>
23#include <vnet/vxlan-gpe/vxlan_gpe.h>
24#include <vnet/l2/l2_classify.h>
25
26#include <vlibapi/api.h>
27#include <vlibmemory/api.h>
28
29extern nsh_option_map_t * nsh_md2_lookup_option (u16 class, u8 type);
30
31extern u8 * format_nsh_header (u8 * s, va_list * args);
32extern u8 * format_nsh_node_map_trace (u8 * s, va_list * args);
33
34/* format from network order */
35u8 * format_nsh_pop_header (u8 * s, va_list * args)
36{
37  return format_nsh_header(s, args);
38}
39
40
41
42u8 * format_nsh_pop_node_map_trace (u8 * s, va_list * args)
43{
44  return format_nsh_node_map_trace(s, args);
45}
46
47
48static uword
49nsh_pop_inline (vlib_main_t * vm,
50               vlib_node_runtime_t * node,
51               vlib_frame_t * from_frame)
52{
53  u32 n_left_from, next_index, *from, *to_next;
54  nsh_main_t * nm = &nsh_main;
55
56  from = vlib_frame_vector_args(from_frame);
57  n_left_from = from_frame->n_vectors;
58
59  next_index = node->cached_next_index;
60
61  while (n_left_from > 0)
62    {
63      u32 n_left_to_next;
64
65      vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
66
67      while (n_left_from >= 4 && n_left_to_next >= 2)
68	{
69	  u32 bi0, bi1;
70	  vlib_buffer_t * b0, *b1;
71	  u32 next0 = NSH_NODE_NEXT_DROP, next1 = NSH_NODE_NEXT_DROP;
72	  uword * entry0, *entry1;
73	  nsh_base_header_t * hdr0 = 0, *hdr1 = 0;
74	  u32 header_len0 = 0, header_len1 = 0;
75	  u32 nsp_nsi0, nsp_nsi1;
76	  u32 error0, error1;
77	  nsh_map_t * map0 = 0, *map1 = 0;
78
79	  /* Prefetch next iteration. */
80	  {
81	    vlib_buffer_t * p2, *p3;
82
83	    p2 = vlib_get_buffer(vm, from[2]);
84	    p3 = vlib_get_buffer(vm, from[3]);
85
86	    vlib_prefetch_buffer_header(p2, LOAD);
87	    vlib_prefetch_buffer_header(p3, LOAD);
88
89	    CLIB_PREFETCH(p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
90	    CLIB_PREFETCH(p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
91	  }
92
93	  bi0 = from[0];
94	  bi1 = from[1];
95	  to_next[0] = bi0;
96	  to_next[1] = bi1;
97	  from += 2;
98	  to_next += 2;
99	  n_left_from -= 2;
100	  n_left_to_next -= 2;
101
102	  error0 = 0;
103	  error1 = 0;
104
105	  b0 = vlib_get_buffer(vm, bi0);
106	  b1 = vlib_get_buffer(vm, bi1);
107	  hdr0 = vlib_buffer_get_current(b0);
108          nsp_nsi0 = hdr0->nsp_nsi;
109          header_len0 = hdr0->length * 4;
110
111          hdr1 = vlib_buffer_get_current(b1);
112	  nsp_nsi1 = hdr1->nsp_nsi;
113	  header_len1 = hdr1->length * 4;
114
115	  /* Process packet 0 */
116	  entry0 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi0);
117	  if (PREDICT_FALSE(entry0 == 0))
118	    {
119	      error0 = NSH_NODE_ERROR_NO_MAPPING;
120	      goto trace0;
121	    }
122
123	  /* Entry should point to a mapping ...*/
124	  map0 = pool_elt_at_index(nm->nsh_mappings, entry0[0]);
125	  if (PREDICT_FALSE(map0 == 0))
126	    {
127	      error0 = NSH_NODE_ERROR_NO_MAPPING;
128	      goto trace0;
129	    }
130
131	  /* set up things for next node to transmit ie which node to handle it and where */
132	  next0 = map0->next_node;
133	  //vnet_buffer(b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
134
135	  if(PREDICT_FALSE(map0->nsh_action == NSH_ACTION_POP))
136	    {
137	      /* Manipulate MD2 */
138              if(PREDICT_FALSE(hdr0->md_type == 2))
139        	{
140        	  if (PREDICT_FALSE(next0 == NSH_NODE_NEXT_DROP))
141        	    {
142        	      error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
143        	      goto trace0;
144        	    }
145	          //vnet_buffer(b0)->sw_if_index[VLIB_RX] = map0->sw_if_index;
146        	}
147
148              /* Pop NSH header */
149	      vlib_buffer_advance(b0, (word)header_len0);
150	      goto trace0;
151	    }
152
153	  entry0 = hash_get_mem(nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
154	  if (PREDICT_FALSE(entry0 == 0))
155	    {
156	      error0 = NSH_NODE_ERROR_NO_ENTRY;
157	      goto trace0;
158	    }
159
160        trace0: b0->error = error0 ? node->errors[error0] : 0;
161
162          if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
163            {
164              nsh_input_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
165              clib_memcpy ( &(tr->trace_data), hdr0, (hdr0->length*4) );
166            }
167
168	  /* Process packet 1 */
169	  entry1 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi1);
170	  if (PREDICT_FALSE(entry1 == 0))
171	    {
172	      error1 = NSH_NODE_ERROR_NO_MAPPING;
173	      goto trace1;
174	    }
175
176	  /* Entry should point to a mapping ...*/
177	  map1 = pool_elt_at_index(nm->nsh_mappings, entry1[0]);
178	  if (PREDICT_FALSE(map1 == 0))
179	    {
180	      error1 = NSH_NODE_ERROR_NO_MAPPING;
181	      goto trace1;
182	    }
183
184	  /* set up things for next node to transmit ie which node to handle it and where */
185	  next1 = map1->next_node;
186	  //vnet_buffer(b1)->sw_if_index[VLIB_TX] = map1->sw_if_index;
187
188	  if(PREDICT_FALSE(map1->nsh_action == NSH_ACTION_POP))
189	    {
190	      /* Manipulate MD2 */
191              if(PREDICT_FALSE(hdr1->md_type == 2))
192        	{
193        	  if (PREDICT_FALSE(next1 == NSH_NODE_NEXT_DROP))
194        	    {
195        	      error1 = NSH_NODE_ERROR_INVALID_OPTIONS;
196        	      goto trace1;
197        	    }
198	          //vnet_buffer(b1)->sw_if_index[VLIB_RX] = map1->sw_if_index;
199        	}
200
201              /* Pop NSH header */
202	      vlib_buffer_advance(b1, (word)header_len1);
203	      goto trace1;
204	    }
205
206	  entry1 = hash_get_mem(nm->nsh_entry_by_key, &map1->mapped_nsp_nsi);
207	  if (PREDICT_FALSE(entry1 == 0))
208	    {
209	      error1 = NSH_NODE_ERROR_NO_ENTRY;
210	      goto trace1;
211	    }
212
213
214	trace1: b1->error = error1 ? node->errors[error1] : 0;
215
216	  if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
217	    {
218	      nsh_input_trace_t *tr = vlib_add_trace(vm, node, b1, sizeof(*tr));
219	      clib_memcpy ( &(tr->trace_data), hdr1, (hdr1->length*4) );
220	    }
221
222	  vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
223					  n_left_to_next, bi0, bi1, next0, next1);
224
225	}
226
227      while (n_left_from > 0 && n_left_to_next > 0)
228	{
229	  u32 bi0 = 0;
230	  vlib_buffer_t * b0 = NULL;
231	  u32 next0 = NSH_NODE_NEXT_DROP;
232	  uword * entry0;
233	  nsh_base_header_t * hdr0 = 0;
234	  u32 header_len0 = 0;
235	  u32 nsp_nsi0;
236	  u32 error0;
237	  nsh_map_t * map0 = 0;
238
239	  bi0 = from[0];
240	  to_next[0] = bi0;
241	  from += 1;
242	  to_next += 1;
243	  n_left_from -= 1;
244	  n_left_to_next -= 1;
245	  error0 = 0;
246
247	  b0 = vlib_get_buffer(vm, bi0);
248	  hdr0 = vlib_buffer_get_current(b0);
249
250          nsp_nsi0 = hdr0->nsp_nsi;
251          header_len0 = hdr0->length * 4;
252
253	  entry0 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi0);
254
255	  if (PREDICT_FALSE(entry0 == 0))
256	    {
257	      error0 = NSH_NODE_ERROR_NO_MAPPING;
258	      goto trace00;
259	    }
260
261	  /* Entry should point to a mapping ...*/
262	  map0 = pool_elt_at_index(nm->nsh_mappings, entry0[0]);
263
264	  if (PREDICT_FALSE(map0 == 0))
265	    {
266	      error0 = NSH_NODE_ERROR_NO_MAPPING;
267	      goto trace00;
268	    }
269
270	  /* set up things for next node to transmit ie which node to handle it and where */
271	  next0 = map0->next_node;
272	  //vnet_buffer(b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
273
274	  if(PREDICT_FALSE(map0->nsh_action == NSH_ACTION_POP))
275	    {
276	      /* Manipulate MD2 */
277              if(PREDICT_FALSE(hdr0->md_type == 2))
278        	{
279        	  if (PREDICT_FALSE(next0 == NSH_NODE_NEXT_DROP))
280        	    {
281        	      error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
282        	      goto trace00;
283        	    }
284	          //vnet_buffer(b0)->sw_if_index[VLIB_RX] = map0->sw_if_index;
285        	}
286
287              /* Pop NSH header */
288	      vlib_buffer_advance(b0, (word)header_len0);
289	      goto trace00;
290	    }
291
292	  entry0 = hash_get_mem(nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
293	  if (PREDICT_FALSE(entry0 == 0))
294	    {
295	      error0 = NSH_NODE_ERROR_NO_ENTRY;
296	      goto trace00;
297	    }
298
299	  trace00: b0->error = error0 ? node->errors[error0] : 0;
300
301	  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
302	    {
303	      nsh_input_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
304	      clib_memcpy ( &(tr->trace_data[0]), hdr0, (hdr0->length*4) );
305	    }
306
307	  vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
308					  n_left_to_next, bi0, next0);
309	}
310
311      vlib_put_next_frame(vm, node, next_index, n_left_to_next);
312
313    }
314
315  return from_frame->n_vectors;
316}
317
318/**
319 * @brief Graph processing dispatch function for NSH Input
320 *
321 * @node nsh_input
322 * @param *vm
323 * @param *node
324 * @param *from_frame
325 *
326 * @return from_frame->n_vectors
327 *
328 */
329static uword
330nsh_pop (vlib_main_t * vm, vlib_node_runtime_t * node,
331                  vlib_frame_t * from_frame)
332{
333  return nsh_pop_inline (vm, node, from_frame);
334}
335
336static char * nsh_pop_node_error_strings[] = {
337#define _(sym,string) string,
338  foreach_nsh_node_error
339#undef _
340};
341
342/* register nsh-input node */
343VLIB_REGISTER_NODE (nsh_pop_node) = {
344  .function = nsh_pop,
345  .name = "nsh-pop",
346  .vector_size = sizeof (u32),
347  .format_trace = format_nsh_pop_node_map_trace,
348  .format_buffer = format_nsh_pop_header,
349  .type = VLIB_NODE_TYPE_INTERNAL,
350
351  .n_errors = ARRAY_LEN(nsh_pop_node_error_strings),
352  .error_strings = nsh_pop_node_error_strings,
353
354  .n_next_nodes = NSH_NODE_N_NEXT,
355
356  .next_nodes = {
357#define _(s,n) [NSH_NODE_NEXT_##s] = n,
358    foreach_nsh_node_next
359#undef _
360  },
361};
362
363VLIB_NODE_FUNCTION_MULTIARCH (nsh_pop_node, nsh_pop);
364
365
366