FD.io VPP  v19.04.2-12-g66b1689
Vector Packet Processing
l2_patch.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 <vnet/pg/pg.h>
18 #include <vnet/ethernet/ethernet.h>
19 #include <vnet/feature/feature.h>
20 #include <vppinfra/error.h>
21 
22 typedef struct
23 {
24  /* vector of dispositions, indexed by rx_sw_if_index */
27 
28  /* convenience variables */
32 
33 typedef struct
34 {
38 
39 /* packet trace format function */
40 static u8 *
41 format_l2_patch_trace (u8 * s, va_list * args)
42 {
43  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
44  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
45  l2_patch_trace_t *t = va_arg (*args, l2_patch_trace_t *);
46 
47  s = format (s, "L2_PATCH: rx %d tx %d", t->rx_sw_if_index,
48  t->tx_sw_if_index);
49  return s;
50 }
51 
53 
55 
56 #define foreach_l2_patch_error \
57 _(PATCHED, "L2 patch packets") \
58 _(DROPPED, "L2 patch misconfigured drops")
59 
60 typedef enum
61 {
62 #define _(sym,str) L2_PATCH_ERROR_##sym,
64 #undef _
67 
68 static char *l2_patch_error_strings[] = {
69 #define _(sym,string) string,
71 #undef _
72 };
73 
74 typedef enum
75 {
79 
83 {
85 
86  if ((b->flags & VLIB_BUFFER_IS_TRACED) == 0)
87  return;
88 
89  t = vlib_add_trace (vm, node, b, sizeof (*t));
92 }
93 
96  l2_patch_main_t * l2pm, vlib_buffer_t ** b, u16 * next,
97  u32 n_left, int do_trace)
98 {
99  u32 sw_if_index[4];
100 
101  while (n_left >= 4)
102  {
103  /* Prefetch next iteration. */
104  if (n_left >= 8)
105  {
106  vlib_buffer_t **p = b + 4;
107  vlib_prefetch_buffer_header (p[0], LOAD);
108  vlib_prefetch_buffer_header (p[1], LOAD);
109  vlib_prefetch_buffer_header (p[2], LOAD);
110  vlib_prefetch_buffer_header (p[3], LOAD);
111  }
112 
113  sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
114  sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
115  sw_if_index[2] = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
116  sw_if_index[3] = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
117 
118  ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index[0]] != ~0);
119  ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[0]] != ~0);
120  ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index[1]] != ~0);
121  ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[1]] != ~0);
122  ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index[2]] != ~0);
123  ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[2]] != ~0);
124  ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index[3]] != ~0);
125  ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[3]] != ~0);
126 
127  next[0] = l2pm->tx_next_by_rx_sw_if_index[sw_if_index[0]];
128  next[1] = l2pm->tx_next_by_rx_sw_if_index[sw_if_index[1]];
129  next[2] = l2pm->tx_next_by_rx_sw_if_index[sw_if_index[2]];
130  next[3] = l2pm->tx_next_by_rx_sw_if_index[sw_if_index[3]];
131 
132  vnet_buffer (b[0])->sw_if_index[VLIB_TX] =
133  l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[0]];
134  vnet_buffer (b[1])->sw_if_index[VLIB_TX] =
135  l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[1]];
136  vnet_buffer (b[2])->sw_if_index[VLIB_TX] =
137  l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[2]];
138  vnet_buffer (b[3])->sw_if_index[VLIB_TX] =
139  l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[3]];
140 
141  if (do_trace)
142  {
143  l2_patch_trace (vm, node, l2pm, b[0], sw_if_index[0]);
144  l2_patch_trace (vm, node, l2pm, b[1], sw_if_index[1]);
145  l2_patch_trace (vm, node, l2pm, b[2], sw_if_index[2]);
146  l2_patch_trace (vm, node, l2pm, b[3], sw_if_index[3]);
147  }
148 
149  /* next */
150  next += 4;
151  b += 4;
152  n_left -= 4;
153  }
154 
155  while (n_left)
156  {
157  sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
158 
159  ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index[0]] != ~0);
160  ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[0]] != ~0);
161 
162  next[0] = l2pm->tx_next_by_rx_sw_if_index[sw_if_index[0]];
163 
164  vnet_buffer (b[0])->sw_if_index[VLIB_TX] =
165  l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index[0]];
166 
167  if (do_trace)
168  l2_patch_trace (vm, node, l2pm, b[0], sw_if_index[0]);
169 
170  /* next */
171  next += 1;
172  b += 1;
173  n_left -= 1;
174  }
175 }
176 
178  vlib_node_runtime_t * node,
179  vlib_frame_t * frame)
180 {
181  u32 *from;
183  vlib_node_t *n = vlib_get_node (vm, l2_patch_node.index);
184  u32 node_counter_base_index = n->error_heap_index;
185  vlib_error_main_t *em = &vm->error_main;
187  u16 nexts[VLIB_FRAME_SIZE];
188 
189  from = vlib_frame_vector_args (frame);
190 
191  vlib_get_buffers (vm, from, bufs, frame->n_vectors);
192 
193  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
194  l2_patch_inline (vm, node, l2pm, bufs, nexts, frame->n_vectors, 1);
195  else
196  l2_patch_inline (vm, node, l2pm, bufs, nexts, frame->n_vectors, 0);
197 
198  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
199 
200  em->counters[node_counter_base_index + L2_PATCH_ERROR_PATCHED] +=
201  frame->n_vectors;
202 
203  return frame->n_vectors;
204 }
205 
206 /* *INDENT-OFF* */
207 VLIB_REGISTER_NODE (l2_patch_node, static) = {
208  .name = "l2-patch",
209  .vector_size = sizeof (u32),
210  .format_trace = format_l2_patch_trace,
211  .type = VLIB_NODE_TYPE_INTERNAL,
212 
213  .n_errors = ARRAY_LEN(l2_patch_error_strings),
214  .error_strings = l2_patch_error_strings,
215 
216  .n_next_nodes = L2_PATCH_N_NEXT,
217 
218  /* edit / add dispositions here */
219  .next_nodes = {
220  [L2_PATCH_NEXT_DROP] = "error-drop",
221  },
222 };
223 /* *INDENT-ON* */
224 
225 extern int
226 vnet_l2_patch_add_del (u32 rx_sw_if_index, u32 tx_sw_if_index, int is_add);
227 #ifndef CLIB_MARCH_VARIANT
228 int
229 vnet_l2_patch_add_del (u32 rx_sw_if_index, u32 tx_sw_if_index, int is_add)
230 {
232  vnet_hw_interface_t *rxhi, *txhi;
233  u32 tx_next_index;
234 
235  /*
236  * We assume that the API msg handler has used 2x VALIDATE_SW_IF_INDEX
237  * macros...
238  */
239 
240  rxhi = vnet_get_sup_hw_interface (l2pm->vnet_main, rx_sw_if_index);
241 
242  /* Make sure caller didn't pass a vlan subif, etc. */
243  if (rxhi->sw_if_index != rx_sw_if_index)
244  return VNET_API_ERROR_INVALID_SW_IF_INDEX;
245 
246  txhi = vnet_get_sup_hw_interface (l2pm->vnet_main, tx_sw_if_index);
247  if (txhi->sw_if_index != tx_sw_if_index)
248  return VNET_API_ERROR_INVALID_SW_IF_INDEX_2;
249 
250  if (is_add)
251  {
252  tx_next_index = vlib_node_add_next (l2pm->vlib_main,
253  l2_patch_node.index,
254  txhi->output_node_index);
255 
257  rx_sw_if_index, ~0);
258 
259  l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = tx_next_index;
261  rx_sw_if_index, ~0);
262  l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index]
263  = txhi->sw_if_index;
264 
267 
268  vnet_feature_enable_disable ("device-input", "l2-patch",
269  rxhi->hw_if_index, 1, 0, 0);
270  }
271  else
272  {
274  0 /* disable promiscuous mode */ );
275 
276  vnet_feature_enable_disable ("device-input", "l2-patch",
277  rxhi->hw_if_index, 0, 0, 0);
278  if (vec_len (l2pm->tx_next_by_rx_sw_if_index) > rx_sw_if_index)
279  {
280  l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = ~0;
281  l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index] = ~0;
282  }
283  }
284 
285  return 0;
286 }
287 #endif
288 
289 static clib_error_t *
291  unformat_input_t * input, vlib_cli_command_t * cmd)
292 {
294  unformat_input_t _line_input, *line_input = &_line_input;
295  u32 rx_sw_if_index, tx_sw_if_index;
296  int rv;
297  int rx_set = 0;
298  int tx_set = 0;
299  int is_add = 1;
300  clib_error_t *error = NULL;
301 
302  /* Get a line of input. */
303  if (!unformat_user (input, unformat_line_input, line_input))
304  return 0;
305 
306  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
307  {
308  if (unformat (line_input, "rx %U", unformat_vnet_sw_interface,
309  l2pm->vnet_main, &rx_sw_if_index))
310  rx_set = 1;
311  else if (unformat (line_input, "tx %U", unformat_vnet_sw_interface,
312  l2pm->vnet_main, &tx_sw_if_index))
313  tx_set = 1;
314  else if (unformat (line_input, "del"))
315  is_add = 0;
316  else
317  break;
318  }
319 
320  if (rx_set == 0)
321  {
322  error = clib_error_return (0, "rx interface not set");
323  goto done;
324  }
325 
326  if (tx_set == 0)
327  {
328  error = clib_error_return (0, "tx interface not set");
329  goto done;
330  }
331 
332  rv = vnet_l2_patch_add_del (rx_sw_if_index, tx_sw_if_index, is_add);
333 
334  switch (rv)
335  {
336  case 0:
337  break;
338 
339  case VNET_API_ERROR_INVALID_SW_IF_INDEX:
340  error = clib_error_return (0, "rx interface not a physical port");
341  goto done;
342 
343  case VNET_API_ERROR_INVALID_SW_IF_INDEX_2:
344  error = clib_error_return (0, "tx interface not a physical port");
345  goto done;
346 
347  default:
348  error = clib_error_return
349  (0, "WARNING: vnet_l2_patch_add_del returned %d", rv);
350  goto done;
351  }
352 
353 
354 done:
355  unformat_free (line_input);
356 
357  return error;
358 }
359 
360 /*?
361  * Create or delete a Layer 2 patch.
362  *
363  * @cliexpar
364  * @cliexstart{test l2patch rx <intfc> tx <intfc> [del]}
365  * @cliexend
366  * @todo This is incomplete. This needs a detailed description and a
367  * practical example.
368 ?*/
369 /* *INDENT-OFF* */
370 VLIB_CLI_COMMAND (test_patch_command, static) = {
371  .path = "test l2patch",
372  .short_help = "test l2patch rx <intfc> tx <intfc> [del]",
373  .function = test_patch_command_fn,
374 };
375 /* *INDENT-ON* */
376 
377 /** Display the contents of the l2patch table. */
378 static clib_error_t *
380  unformat_input_t * input, vlib_cli_command_t * cmd)
381 {
383  u32 rx_sw_if_index;
384  u32 no_entries = 1;
385 
388 
389  for (rx_sw_if_index = 0;
390  rx_sw_if_index < vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index);
391  rx_sw_if_index++)
392  {
393  u32 tx_sw_if_index =
394  l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index];
395  if (tx_sw_if_index != ~0)
396  {
397  no_entries = 0;
398  vlib_cli_output (vm, "%26U -> %U",
400  l2pm->vnet_main, rx_sw_if_index,
402  l2pm->vnet_main, tx_sw_if_index);
403  }
404  }
405 
406  if (no_entries)
407  vlib_cli_output (vm, "no l2patch entries");
408 
409  return 0;
410 }
411 
412 /*?
413  * Show Layer 2 patch entries.
414  *
415  * @cliexpar
416  * @cliexstart{show l2patch}
417  * @cliexend
418  * @todo This is incomplete. This needs a detailed description and a
419  * practical example.
420 ?*/
421 /* *INDENT-OFF* */
422 VLIB_CLI_COMMAND (show_l2patch_cli, static) = {
423  .path = "show l2patch",
424  .short_help = "Show l2 interface cross-connect entries",
425  .function = show_l2patch,
426 };
427 /* *INDENT-ON* */
428 
429 static clib_error_t *
431 {
433 
434  mp->vlib_main = vm;
435  mp->vnet_main = vnet_get_main ();
436 
437  return 0;
438 }
439 
441 
442 /*
443  * fd.io coding-style-patch-verification: ON
444  *
445  * Local Variables:
446  * eval: (c-set-style "gnu")
447  * End:
448  */
u32 sw_if_index
Definition: ipsec_gre.api:37
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
vnet_main_t * vnet_main
Definition: l2_patch.c:30
static clib_error_t * l2_patch_init(vlib_main_t *vm)
Definition: l2_patch.c:430
static clib_error_t * show_l2patch(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Display the contents of the l2patch table.
Definition: l2_patch.c:379
u32 error_heap_index
Definition: node.h:323
#define CLIB_UNUSED(x)
Definition: clib.h:82
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
static vnet_hw_interface_t * vnet_get_sup_hw_interface(vnet_main_t *vnm, u32 sw_if_index)
static_always_inline void l2_patch_inline(vlib_main_t *vm, vlib_node_runtime_t *node, l2_patch_main_t *l2pm, vlib_buffer_t **b, u16 *next, u32 n_left, int do_trace)
Definition: l2_patch.c:95
#define NULL
Definition: clib.h:58
uword unformat_user(unformat_input_t *input, unformat_function_t *func,...)
Definition: unformat.c:983
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
unformat_function_t unformat_vnet_sw_interface
#define VLIB_NODE_FN(node)
Definition: node.h:201
format_function_t format_vnet_sw_if_index_name
static uword vlib_node_add_next(vlib_main_t *vm, uword node, uword next_node)
Definition: node_funcs.h:1122
unsigned char u8
Definition: types.h:56
#define static_always_inline
Definition: clib.h:99
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:163
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
#define clib_error_return(e, args...)
Definition: error.h:99
unsigned int u32
Definition: types.h:88
#define VLIB_FRAME_SIZE
Definition: node.h:376
unformat_function_t unformat_line_input
Definition: format.h:282
vlib_error_main_t error_main
Definition: main.h:158
static u8 * format_l2_patch_trace(u8 *s, va_list *args)
Definition: l2_patch.c:41
struct _unformat_input_t unformat_input_t
unsigned short u16
Definition: types.h:57
static char * l2_patch_error_strings[]
Definition: l2_patch.c:68
#define PREDICT_FALSE(x)
Definition: clib.h:111
u64 * counters
Definition: error.h:78
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
#define UNFORMAT_END_OF_INPUT
Definition: format.h:144
vlib_main_t * vm
Definition: buffer.c:312
static_always_inline void vlib_buffer_enqueue_to_next(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, u16 *nexts, uword count)
Definition: buffer_node.h:332
static l2_patch_main_t l2_patch_main
Definition: l2_patch.c:52
u32 tx_sw_if_index
Definition: l2_patch.c:36
u32 * tx_next_by_rx_sw_if_index
Definition: l2_patch.c:25
#define ETHERNET_INTERFACE_FLAG_ACCEPT_ALL
Definition: ethernet.h:141
#define ARRAY_LEN(x)
Definition: clib.h:62
l2_patch_error_t
Definition: l2_patch.c:60
#define foreach_l2_patch_error
Definition: l2_patch.c:56
#define VLIB_CLI_COMMAND(x,...)
Definition: cli.h:155
#define ASSERT(truth)
static_always_inline void l2_patch_trace(vlib_main_t *vm, vlib_node_runtime_t *node, l2_patch_main_t *l2pm, vlib_buffer_t *b, u32 sw_if_index)
Definition: l2_patch.c:81
vlib_main_t * vlib_main
Definition: l2_patch.c:29
u8 is_add
Definition: ipsec_gre.api:36
static vlib_node_registration_t l2_patch_node
(constructor) VLIB_REGISTER_NODE (l2_patch_node)
Definition: l2_patch.c:54
u32 * tx_sw_if_index_by_rx_sw_if_index
Definition: l2_patch.c:26
static clib_error_t * test_patch_command_fn(vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd)
Definition: l2_patch.c:290
l2_patch_next_t
Definition: l2_patch.c:74
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
struct _vlib_node_registration vlib_node_registration_t
Definition: defs.h:47
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
VLIB buffer representation.
Definition: buffer.h:102
static void unformat_free(unformat_input_t *i)
Definition: format.h:162
int vnet_l2_patch_add_del(u32 rx_sw_if_index, u32 tx_sw_if_index, int is_add)
Definition: l2_patch.c:229
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:274
#define vnet_buffer(b)
Definition: buffer.h:369
u32 rx_sw_if_index
Definition: l2_patch.c:35
static vlib_node_t * vlib_get_node(vlib_main_t *vm, u32 i)
Get vlib node by index.
Definition: node_funcs.h:59
static_always_inline void vlib_get_buffers(vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, int count)
Translate array of buffer indices into buffer pointers.
Definition: buffer_funcs.h:244
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:301
#define vec_validate_init_empty(V, I, INIT)
Make sure vector is long enough for given index and initialize empty space (no header, unspecified alignment)
Definition: vec.h:486
void vlib_cli_output(vlib_main_t *vm, char *fmt,...)
Definition: cli.c:762
uword unformat(unformat_input_t *i, const char *fmt,...)
Definition: unformat.c:972
Definition: defs.h:46
int vnet_feature_enable_disable(const char *arc_name, const char *node_name, u32 sw_if_index, int enable_disable, void *feature_config, u32 n_feature_config_bytes)
Definition: feature.c:274
static uword unformat_check_input(unformat_input_t *i)
Definition: format.h:170
u32 ethernet_set_flags(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Definition: interface.c:372