FD.io VPP  v19.08.3-2-gbabecb413
Vector Packet Processing
node.c
Go to the documentation of this file.
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 /*
16  * ppp_node.c: ppp packet processing
17  *
18  * Copyright (c) 2010 Eliot Dresselhaus
19  *
20  * Permission is hereby granted, free of charge, to any person obtaining
21  * a copy of this software and associated documentation files (the
22  * "Software"), to deal in the Software without restriction, including
23  * without limitation the rights to use, copy, modify, merge, publish,
24  * distribute, sublicense, and/or sell copies of the Software, and to
25  * permit persons to whom the Software is furnished to do so, subject to
26  * the following conditions:
27  *
28  * The above copyright notice and this permission notice shall be
29  * included in all copies or substantial portions of the Software.
30  *
31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38  */
39 
40 #include <vlib/vlib.h>
41 #include <vnet/pg/pg.h>
42 #include <vnet/ppp/ppp.h>
43 #include <vppinfra/sparse_vec.h>
44 
45 #define foreach_ppp_input_next \
46  _ (PUNT, "error-punt") \
47  _ (DROP, "error-drop")
48 
49 typedef enum
50 {
51 #define _(s,n) PPP_INPUT_NEXT_##s,
53 #undef _
56 
57 typedef struct
58 {
59  u8 packet_data[32];
61 
62 static u8 *
63 format_ppp_input_trace (u8 * s, va_list * va)
64 {
65  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
66  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
67  ppp_input_trace_t *t = va_arg (*va, ppp_input_trace_t *);
68 
69  s = format (s, "%U", format_ppp_header, t->packet_data);
70 
71  return s;
72 }
73 
74 typedef struct
75 {
76  /* Sparse vector mapping ppp protocol in network byte order
77  to next index. */
79 
82 
83 static uword
85  vlib_node_runtime_t * node, vlib_frame_t * from_frame)
86 {
87  ppp_input_runtime_t *rt = (void *) node->runtime_data;
88  u32 n_left_from, next_index, i_next, *from, *to_next;
89 
90  from = vlib_frame_vector_args (from_frame);
91  n_left_from = from_frame->n_vectors;
92 
93  if (node->flags & VLIB_NODE_FLAG_TRACE)
95  from,
96  n_left_from,
97  sizeof (from[0]),
98  sizeof (ppp_input_trace_t));
99 
100  next_index = node->cached_next_index;
101  i_next = vec_elt (rt->sparse_index_by_next_index, next_index);
102 
103  while (n_left_from > 0)
104  {
105  u32 n_left_to_next;
106 
107  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
108 
109  while (n_left_from >= 4 && n_left_to_next >= 2)
110  {
111  u32 bi0, bi1;
112  vlib_buffer_t *b0, *b1;
113  ppp_header_t *h0, *h1;
114  u32 i0, i1, protocol0, protocol1, enqueue_code;
115 
116  /* Prefetch next iteration. */
117  {
118  vlib_buffer_t *p2, *p3;
119 
120  p2 = vlib_get_buffer (vm, from[2]);
121  p3 = vlib_get_buffer (vm, from[3]);
122 
123  vlib_prefetch_buffer_header (p2, LOAD);
124  vlib_prefetch_buffer_header (p3, LOAD);
125 
126  CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
127  CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
128  }
129 
130  bi0 = from[0];
131  bi1 = from[1];
132  to_next[0] = bi0;
133  to_next[1] = bi1;
134  from += 2;
135  to_next += 2;
136  n_left_to_next -= 2;
137  n_left_from -= 2;
138 
139  b0 = vlib_get_buffer (vm, bi0);
140  b1 = vlib_get_buffer (vm, bi1);
141 
142  h0 = vlib_buffer_get_current (b0);
143  h1 = vlib_buffer_get_current (b1);
144 
145  vlib_buffer_advance (b0, sizeof (ppp_header_t));
146  vlib_buffer_advance (b1, sizeof (ppp_header_t));
147 
148  /* Index sparse array with network byte order. */
149  protocol0 = h0->protocol;
150  protocol1 = h1->protocol;
151  sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1, &i0,
152  &i1);
153 
154  b0->error =
155  node->errors[i0 ==
156  SPARSE_VEC_INVALID_INDEX ? PPP_ERROR_UNKNOWN_PROTOCOL
157  : PPP_ERROR_NONE];
158  b1->error =
159  node->errors[i1 ==
160  SPARSE_VEC_INVALID_INDEX ? PPP_ERROR_UNKNOWN_PROTOCOL
161  : PPP_ERROR_NONE];
162 
163  enqueue_code = (i0 != i_next) + 2 * (i1 != i_next);
164 
165  if (PREDICT_FALSE (enqueue_code != 0))
166  {
167  switch (enqueue_code)
168  {
169  case 1:
170  /* A B A */
171  to_next[-2] = bi1;
172  to_next -= 1;
173  n_left_to_next += 1;
174  vlib_set_next_frame_buffer (vm, node,
176  i0), bi0);
177  break;
178 
179  case 2:
180  /* A A B */
181  to_next -= 1;
182  n_left_to_next += 1;
183  vlib_set_next_frame_buffer (vm, node,
185  i1), bi1);
186  break;
187 
188  case 3:
189  /* A B B or A B C */
190  to_next -= 2;
191  n_left_to_next += 2;
192  vlib_set_next_frame_buffer (vm, node,
194  i0), bi0);
195  vlib_set_next_frame_buffer (vm, node,
197  i1), bi1);
198  if (i0 == i1)
199  {
200  vlib_put_next_frame (vm, node, next_index,
201  n_left_to_next);
202  i_next = i1;
203  next_index = vec_elt (rt->next_by_protocol, i_next);
204  vlib_get_next_frame (vm, node, next_index, to_next,
205  n_left_to_next);
206  }
207  }
208  }
209  }
210 
211  while (n_left_from > 0 && n_left_to_next > 0)
212  {
213  u32 bi0;
214  vlib_buffer_t *b0;
215  ppp_header_t *h0;
216  u32 i0, protocol0;
217 
218  bi0 = from[0];
219  to_next[0] = bi0;
220  from += 1;
221  to_next += 1;
222  n_left_from -= 1;
223  n_left_to_next -= 1;
224 
225  b0 = vlib_get_buffer (vm, bi0);
226 
227  h0 = vlib_buffer_get_current (b0);
228 
229  vlib_buffer_advance (b0, sizeof (ppp_header_t));
230 
231  protocol0 = h0->protocol;
232  i0 = sparse_vec_index (rt->next_by_protocol, protocol0);
233 
234  b0->error =
235  node->errors[i0 ==
236  SPARSE_VEC_INVALID_INDEX ? PPP_ERROR_UNKNOWN_PROTOCOL
237  : PPP_ERROR_NONE];
238 
239  /* Sent packet to wrong next? */
240  if (PREDICT_FALSE (i0 != i_next))
241  {
242  /* Return old frame; remove incorrectly enqueued packet. */
243  vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
244 
245  /* Send to correct next. */
246  i_next = i0;
247  next_index = vec_elt (rt->next_by_protocol, i_next);
248  vlib_get_next_frame (vm, node, next_index,
249  to_next, n_left_to_next);
250  to_next[0] = bi0;
251  to_next += 1;
252  n_left_to_next -= 1;
253  }
254  }
255 
256  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
257  }
258 
259  return from_frame->n_vectors;
260 }
261 
262 static char *ppp_error_strings[] = {
263 #define ppp_error(n,s) s,
264 #include "error.def"
265 #undef ppp_error
266 };
267 
268 /* *INDENT-OFF* */
270  .function = ppp_input,
271  .name = "ppp-input",
272  /* Takes a vector of packets. */
273  .vector_size = sizeof (u32),
274 
275  .runtime_data_bytes = sizeof (ppp_input_runtime_t),
276 
277  .n_errors = PPP_N_ERROR,
278  .error_strings = ppp_error_strings,
279 
280  .n_next_nodes = PPP_INPUT_N_NEXT,
281  .next_nodes = {
282 #define _(s,n) [PPP_INPUT_NEXT_##s] = n,
284 #undef _
285  },
286 
287  .format_buffer = format_ppp_header_with_length,
288  .format_trace = format_ppp_input_trace,
289  .unformat_buffer = unformat_ppp_header,
290 };
291 /* *INDENT-ON* */
292 
293 static clib_error_t *
295 {
297 
299 
301  ( /* elt bytes */ sizeof (rt->next_by_protocol[0]),
302  /* bits in index */ BITS (((ppp_header_t *) 0)->protocol));
303 
304  vec_validate (rt->sparse_index_by_next_index, PPP_INPUT_NEXT_DROP);
305  vec_validate (rt->sparse_index_by_next_index, PPP_INPUT_NEXT_PUNT);
306  rt->sparse_index_by_next_index[PPP_INPUT_NEXT_DROP]
308  rt->sparse_index_by_next_index[PPP_INPUT_NEXT_PUNT]
310 
311  return 0;
312 }
313 
314 static clib_error_t *
316 {
317 
318  {
320  if (error)
321  clib_error_report (error);
322  }
323 
324  ppp_setup_node (vm, ppp_input_node.index);
326 
327  return 0;
328 }
329 
332 
333 void
335  ppp_protocol_t protocol, u32 node_index)
336 {
337  ppp_main_t *em = &ppp_main;
340  u16 *n;
341  u32 i;
342 
343  {
345  if (error)
346  clib_error_report (error);
347  }
348 
349  pi = ppp_get_protocol_info (em, protocol);
350  pi->node_index = node_index;
351  pi->next_index = vlib_node_add_next (vm, ppp_input_node.index, node_index);
352 
353  /* Setup ppp protocol -> next index sparse vector mapping. */
355  n =
357  clib_host_to_net_u16 (protocol));
358  n[0] = pi->next_index;
359 
360  /* Rebuild next index -> sparse index inverse mapping when sparse vector
361  is updated. */
363  for (i = 1; i < vec_len (rt->next_by_protocol); i++)
365 }
366 
367 /*
368  * fd.io coding-style-patch-verification: ON
369  *
370  * Local Variables:
371  * eval: (c-set-style "gnu")
372  * End:
373  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:439
static clib_error_t * ppp_input_init(vlib_main_t *vm)
Definition: node.c:315
#define CLIB_UNUSED(x)
Definition: clib.h:83
u8 runtime_data[0]
Function dependent node-runtime data.
Definition: node.h:523
unformat_function_t unformat_ppp_header
Definition: ppp.h:106
static void vlib_set_next_frame_buffer(vlib_main_t *vm, vlib_node_runtime_t *node, u32 next_index, u32 buffer_index)
Definition: node_funcs.h:371
u16 protocol
Definition: packet.h:188
int i
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
static void ppp_setup_node(vlib_main_t *vm, u32 node_index)
Definition: ppp.h:110
u32 next_index
Definition: ppp.h:69
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:470
ppp_protocol_t
Definition: packet.h:150
static uword vlib_node_add_next(vlib_main_t *vm, uword node, uword next_node)
Definition: node_funcs.h:1092
unsigned char u8
Definition: types.h:56
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:173
#define sparse_vec_validate(v, i)
Definition: sparse_vec.h:231
format_function_t format_ppp_header
Definition: ppp.h:97
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
static u8 * format_ppp_input_trace(u8 *s, va_list *va)
Definition: node.c:63
unsigned int u32
Definition: types.h:88
static void sparse_vec_index2(void *v, u32 si0, u32 si1, u32 *i0_return, u32 *i1_return)
Definition: sparse_vec.h:169
#define vlib_call_init_function(vm, x)
Definition: init.h:270
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
u8 packet_data[32]
Definition: node.c:59
static char * ppp_error_strings[]
Definition: node.c:262
vl_api_ip_proto_t protocol
Definition: punt.api:39
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
ppp_main_t ppp_main
Definition: ppp.c:44
static void * vlib_node_get_runtime_data(vlib_main_t *vm, u32 node_index)
Get node runtime private data by node index.
Definition: node_funcs.h:110
#define PREDICT_FALSE(x)
Definition: clib.h:112
#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:338
u32 node_index
Definition: ppp.h:66
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:397
static ppp_protocol_info_t * ppp_get_protocol_info(ppp_main_t *em, ppp_protocol_t protocol)
Definition: ppp.h:83
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_main_t * vm
Definition: buffer.c:323
u8 data[]
Packet data.
Definition: buffer.h:181
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:456
Definition: ppp.h:72
static uword ppp_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: node.c:84
format_function_t format_ppp_header_with_length
Definition: ppp.h:98
static uword sparse_vec_index(void *v, uword sparse_index)
Definition: sparse_vec.h:161
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:515
static clib_error_t * ppp_input_runtime_init(vlib_main_t *vm)
Definition: node.c:294
ppp_input_next_t
Definition: node.c:49
#define clib_error_report(e)
Definition: error.h:113
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
u16 * next_by_protocol
Definition: node.c:78
#define vec_elt(v, i)
Get vector value at index i.
void vlib_trace_frame_buffers_only(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, uword n_buffers, uword next_buffer_stride, uword n_buffer_data_bytes_in_trace)
Definition: trace.c:47
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
static clib_error_t * ppp_init(vlib_main_t *vm)
Definition: ppp.c:228
void ppp_register_input_protocol(vlib_main_t *vm, ppp_protocol_t protocol, u32 node_index)
Definition: node.c:334
vlib_node_registration_t ppp_input_node
(constructor) VLIB_REGISTER_NODE (ppp_input_node)
Definition: node.c:269
u16 flags
Copy of main node flags.
Definition: node.h:509
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:302
static void * sparse_vec_new(uword elt_bytes, uword sparse_index_bits)
Definition: sparse_vec.h:71
#define BITS(x)
Definition: clib.h:62
VLIB_WORKER_INIT_FUNCTION(hdlc_input_runtime_init)
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
#define foreach_ppp_input_next
Definition: node.c:45
u32 * sparse_index_by_next_index
Definition: node.c:80
#define SPARSE_VEC_INVALID_INDEX
Definition: sparse_vec.h:68