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Vector Packet Processing
nsh_pop.c
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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>
24 #include <vnet/l2/l2_classify.h>
25 
26 #include <vlibapi/api.h>
27 #include <vlibmemory/api.h>
28 
29 extern nsh_option_map_t * nsh_md2_lookup_option (u16 class, u8 type);
30 
31 extern u8 * format_nsh_header (u8 * s, va_list * args);
32 extern u8 * format_nsh_node_map_trace (u8 * s, va_list * args);
33 extern u8 * format_nsh_pop_header (u8 * s, va_list * args);
34 extern u8 * format_nsh_pop_node_map_trace (u8 * s, va_list * args);
35 
36 static uword
38  vlib_node_runtime_t * node,
39  vlib_frame_t * from_frame)
40 {
41  u32 n_left_from, next_index, *from, *to_next;
42  nsh_main_t * nm = &nsh_main;
43 
44  from = vlib_frame_vector_args(from_frame);
45  n_left_from = from_frame->n_vectors;
46 
47  next_index = node->cached_next_index;
48 
49  while (n_left_from > 0)
50  {
51  u32 n_left_to_next;
52 
53  vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
54 
55  while (n_left_from >= 4 && n_left_to_next >= 2)
56  {
57  u32 bi0, bi1;
58  vlib_buffer_t * b0, *b1;
59  u32 next0 = NSH_NODE_NEXT_DROP, next1 = NSH_NODE_NEXT_DROP;
60  uword * entry0, *entry1;
61  nsh_base_header_t * hdr0 = 0, *hdr1 = 0;
62  u32 header_len0 = 0, header_len1 = 0;
63  u32 nsp_nsi0, nsp_nsi1;
64  u32 error0, error1;
65  nsh_map_t * map0 = 0, *map1 = 0;
66 
67  /* Prefetch next iteration. */
68  {
69  vlib_buffer_t * p2, *p3;
70 
71  p2 = vlib_get_buffer(vm, from[2]);
72  p3 = vlib_get_buffer(vm, from[3]);
73 
76 
79  }
80 
81  bi0 = from[0];
82  bi1 = from[1];
83  to_next[0] = bi0;
84  to_next[1] = bi1;
85  from += 2;
86  to_next += 2;
87  n_left_from -= 2;
88  n_left_to_next -= 2;
89 
90  error0 = 0;
91  error1 = 0;
92 
93  b0 = vlib_get_buffer(vm, bi0);
94  b1 = vlib_get_buffer(vm, bi1);
95  hdr0 = vlib_buffer_get_current(b0);
96  nsp_nsi0 = hdr0->nsp_nsi;
97  header_len0 = hdr0->length * 4;
98 
99  hdr1 = vlib_buffer_get_current(b1);
100  nsp_nsi1 = hdr1->nsp_nsi;
101  header_len1 = hdr1->length * 4;
102 
103  /* Process packet 0 */
104  entry0 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi0);
105  if (PREDICT_FALSE(entry0 == 0))
106  {
107  error0 = NSH_NODE_ERROR_NO_MAPPING;
108  goto trace0;
109  }
110 
111  /* Entry should point to a mapping ...*/
112  map0 = pool_elt_at_index(nm->nsh_mappings, entry0[0]);
113  if (PREDICT_FALSE(map0 == 0))
114  {
115  error0 = NSH_NODE_ERROR_NO_MAPPING;
116  goto trace0;
117  }
118 
119  /* set up things for next node to transmit ie which node to handle it and where */
120  next0 = map0->next_node;
121  //vnet_buffer(b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
122 
124  {
125  /* Manipulate MD2 */
126  if(PREDICT_FALSE(hdr0->md_type == 2))
127  {
128  if (PREDICT_FALSE(next0 == NSH_NODE_NEXT_DROP))
129  {
130  error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
131  goto trace0;
132  }
133  //vnet_buffer(b0)->sw_if_index[VLIB_RX] = map0->sw_if_index;
134  }
135 
136  /* Pop NSH header */
137  vlib_buffer_advance(b0, (word)header_len0);
138  goto trace0;
139  }
140 
141  entry0 = hash_get_mem(nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
142  if (PREDICT_FALSE(entry0 == 0))
143  {
144  error0 = NSH_NODE_ERROR_NO_ENTRY;
145  goto trace0;
146  }
147 
148  trace0: b0->error = error0 ? node->errors[error0] : 0;
149 
150  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
151  {
152  nsh_input_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
153  clib_memcpy_fast ( &(tr->trace_data), hdr0, (hdr0->length*4) );
154  }
155 
156  /* Process packet 1 */
157  entry1 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi1);
158  if (PREDICT_FALSE(entry1 == 0))
159  {
160  error1 = NSH_NODE_ERROR_NO_MAPPING;
161  goto trace1;
162  }
163 
164  /* Entry should point to a mapping ...*/
165  map1 = pool_elt_at_index(nm->nsh_mappings, entry1[0]);
166  if (PREDICT_FALSE(map1 == 0))
167  {
168  error1 = NSH_NODE_ERROR_NO_MAPPING;
169  goto trace1;
170  }
171 
172  /* set up things for next node to transmit ie which node to handle it and where */
173  next1 = map1->next_node;
174  //vnet_buffer(b1)->sw_if_index[VLIB_TX] = map1->sw_if_index;
175 
176  if(PREDICT_FALSE(map1->nsh_action == NSH_ACTION_POP))
177  {
178  /* Manipulate MD2 */
179  if(PREDICT_FALSE(hdr1->md_type == 2))
180  {
181  if (PREDICT_FALSE(next1 == NSH_NODE_NEXT_DROP))
182  {
183  error1 = NSH_NODE_ERROR_INVALID_OPTIONS;
184  goto trace1;
185  }
186  //vnet_buffer(b1)->sw_if_index[VLIB_RX] = map1->sw_if_index;
187  }
188 
189  /* Pop NSH header */
190  vlib_buffer_advance(b1, (word)header_len1);
191  goto trace1;
192  }
193 
194  entry1 = hash_get_mem(nm->nsh_entry_by_key, &map1->mapped_nsp_nsi);
195  if (PREDICT_FALSE(entry1 == 0))
196  {
197  error1 = NSH_NODE_ERROR_NO_ENTRY;
198  goto trace1;
199  }
200 
201 
202  trace1: b1->error = error1 ? node->errors[error1] : 0;
203 
204  if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
205  {
206  nsh_input_trace_t *tr = vlib_add_trace(vm, node, b1, sizeof(*tr));
207  clib_memcpy_fast ( &(tr->trace_data), hdr1, (hdr1->length*4) );
208  }
209 
210  vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
211  n_left_to_next, bi0, bi1, next0, next1);
212 
213  }
214 
215  while (n_left_from > 0 && n_left_to_next > 0)
216  {
217  u32 bi0 = 0;
218  vlib_buffer_t * b0 = NULL;
219  u32 next0 = NSH_NODE_NEXT_DROP;
220  uword * entry0;
221  nsh_base_header_t * hdr0 = 0;
222  u32 header_len0 = 0;
223  u32 nsp_nsi0;
224  u32 error0;
225  nsh_map_t * map0 = 0;
226 
227  bi0 = from[0];
228  to_next[0] = bi0;
229  from += 1;
230  to_next += 1;
231  n_left_from -= 1;
232  n_left_to_next -= 1;
233  error0 = 0;
234 
235  b0 = vlib_get_buffer(vm, bi0);
236  hdr0 = vlib_buffer_get_current(b0);
237 
238  nsp_nsi0 = hdr0->nsp_nsi;
239  header_len0 = hdr0->length * 4;
240 
241  entry0 = hash_get_mem(nm->nsh_mapping_by_key, &nsp_nsi0);
242 
243  if (PREDICT_FALSE(entry0 == 0))
244  {
245  error0 = NSH_NODE_ERROR_NO_MAPPING;
246  goto trace00;
247  }
248 
249  /* Entry should point to a mapping ...*/
250  map0 = pool_elt_at_index(nm->nsh_mappings, entry0[0]);
251 
252  if (PREDICT_FALSE(map0 == 0))
253  {
254  error0 = NSH_NODE_ERROR_NO_MAPPING;
255  goto trace00;
256  }
257 
258  /* set up things for next node to transmit ie which node to handle it and where */
259  next0 = map0->next_node;
260  //vnet_buffer(b0)->sw_if_index[VLIB_TX] = map0->sw_if_index;
261 
263  {
264  /* Manipulate MD2 */
265  if(PREDICT_FALSE(hdr0->md_type == 2))
266  {
267  if (PREDICT_FALSE(next0 == NSH_NODE_NEXT_DROP))
268  {
269  error0 = NSH_NODE_ERROR_INVALID_OPTIONS;
270  goto trace00;
271  }
272  //vnet_buffer(b0)->sw_if_index[VLIB_RX] = map0->sw_if_index;
273  }
274 
275  /* Pop NSH header */
276  vlib_buffer_advance(b0, (word)header_len0);
277  goto trace00;
278  }
279 
280  entry0 = hash_get_mem(nm->nsh_entry_by_key, &map0->mapped_nsp_nsi);
281  if (PREDICT_FALSE(entry0 == 0))
282  {
283  error0 = NSH_NODE_ERROR_NO_ENTRY;
284  goto trace00;
285  }
286 
287  trace00: b0->error = error0 ? node->errors[error0] : 0;
288 
289  if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
290  {
291  nsh_input_trace_t *tr = vlib_add_trace(vm, node, b0, sizeof(*tr));
292  clib_memcpy_fast ( &(tr->trace_data[0]), hdr0, (hdr0->length*4) );
293  }
294 
295  vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
296  n_left_to_next, bi0, next0);
297  }
298 
299  vlib_put_next_frame(vm, node, next_index, n_left_to_next);
300 
301  }
302 
303  return from_frame->n_vectors;
304 }
305 
306 /**
307  * @brief Graph processing dispatch function for NSH Input
308  *
309  * @node nsh_input
310  * @param *vm
311  * @param *node
312  * @param *from_frame
313  *
314  * @return from_frame->n_vectors
315  *
316  */
318  vlib_frame_t * from_frame)
319 {
320  return nsh_pop_inline (vm, node, from_frame);
321 }
322 
323 static char * nsh_pop_node_error_strings[] = {
324 #define _(sym,string) string,
326 #undef _
327 };
328 
329 /* register nsh-input node */
331  .name = "nsh-pop",
332  .vector_size = sizeof (u32),
333  .format_trace = format_nsh_pop_node_map_trace,
334  .format_buffer = format_nsh_pop_header,
335  .type = VLIB_NODE_TYPE_INTERNAL,
336 
338  .error_strings = nsh_pop_node_error_strings,
339 
340  .n_next_nodes = NSH_NODE_N_NEXT,
341 
342  .next_nodes = {
343 #define _(s,n) [NSH_NODE_NEXT_##s] = n,
345 #undef _
346  },
347 };
348 
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 nsh_action
Definition: nsh.h:74
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
#define NULL
Definition: clib.h:58
u32 next_node
Definition: nsh.h:84
#define foreach_nsh_node_next
Definition: nsh.h:208
VXLAN GPE definitions.
u8 data[0]
Packet data.
Definition: buffer.h:181
static char * nsh_pop_node_error_strings[]
Definition: nsh_pop.c:323
#define VLIB_NODE_FN(node)
Definition: node.h:201
u8 * format_nsh_pop_node_map_trace(u8 *s, va_list *args)
Definition: nsh_cli.c:31
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:469
unsigned char u8
Definition: types.h:56
i64 word
Definition: types.h:111
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
unsigned int u32
Definition: types.h:88
vlib_node_registration_t nsh_pop_node
(constructor) VLIB_REGISTER_NODE (nsh_pop_node)
Definition: nsh_pop.c:330
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:514
Definition: nsh.h:59
nsh_map_t * nsh_mappings
Definition: nsh.h:116
uword * nsh_entry_by_key
Definition: nsh.h:113
unsigned short u16
Definition: types.h:57
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
#define PREDICT_FALSE(x)
Definition: clib.h:111
#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: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:368
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:395
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_main_t * vm
Definition: buffer.c:312
u8 * format_nsh_header(u8 *s, va_list *args)
Definition: nsh_cli.c:512
u8 * format_nsh_pop_header(u8 *s, va_list *args)
Definition: nsh_cli.c:25
nsh_main_t nsh_main
Definition: nsh.c:28
#define ARRAY_LEN(x)
Definition: clib.h:62
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:465
#define foreach_nsh_node_error
Definition: nsh.h:191
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:514
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
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
u8 * format_nsh_node_map_trace(u8 *s, va_list *args)
Definition: nsh_cli.c:597
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
u8 trace_data[256]
Definition: nsh.h:176
static uword nsh_pop_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: nsh_pop.c:37
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:274
nsh_option_map_t * nsh_md2_lookup_option(u16 class, u8 type)
Definition: nsh.c:88
#define hash_get_mem(h, key)
Definition: hash.h:269
#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