FD.io VPP  v17.04-9-g99c0734
Vector Packet Processing
l2_input_acl.c
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1 /*
2  * l2_input_acl.c : layer 2 input acl processing
3  *
4  * Copyright (c) 2013 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 <vlib/vlib.h>
19 #include <vnet/vnet.h>
20 #include <vnet/pg/pg.h>
21 #include <vnet/ethernet/ethernet.h>
22 #include <vnet/ethernet/packet.h>
23 #include <vnet/ip/ip_packet.h>
24 #include <vnet/ip/ip4_packet.h>
25 #include <vnet/ip/ip6_packet.h>
26 #include <vlib/cli.h>
27 #include <vnet/l2/l2_input.h>
28 #include <vnet/l2/feat_bitmap.h>
29 
30 #include <vppinfra/error.h>
31 #include <vppinfra/hash.h>
32 #include <vppinfra/cache.h>
33 
36 
37 typedef struct
38 {
39 
40  /* Next nodes for each feature */
41  u32 feat_next_node_index[32];
42 
43  /* convenience variables */
47 
48 typedef struct
49 {
55 
56 /* packet trace format function */
57 static u8 *
58 format_l2_inacl_trace (u8 * s, va_list * args)
59 {
60  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
61  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
62  l2_inacl_trace_t *t = va_arg (*args, l2_inacl_trace_t *);
63 
64  s = format (s, "INACL: sw_if_index %d, next_index %d, table %d, offset %d",
65  t->sw_if_index, t->next_index, t->table_index, t->offset);
66  return s;
67 }
68 
70 
72 
73 #define foreach_l2_inacl_error \
74 _(NONE, "valid input ACL packets") \
75 _(MISS, "input ACL misses") \
76 _(HIT, "input ACL hits") \
77 _(CHAIN_HIT, "input ACL hits after chain walk") \
78 _(TABLE_MISS, "input ACL table-miss drops") \
79 _(SESSION_DENY, "input ACL session deny drops")
80 
81 
82 typedef enum
83 {
84 #define _(sym,str) L2_INACL_ERROR_##sym,
86 #undef _
89 
90 static char *l2_inacl_error_strings[] = {
91 #define _(sym,string) string,
93 #undef _
94 };
95 
96 static uword
98  vlib_node_runtime_t * node, vlib_frame_t * frame)
99 {
100  u32 n_left_from, *from, *to_next;
101  acl_next_index_t next_index;
106  f64 now = vlib_time_now (vm);
107  u32 hits = 0;
108  u32 misses = 0;
109  u32 chain_hits = 0;
110 
111  from = vlib_frame_vector_args (frame);
112  n_left_from = frame->n_vectors; /* number of packets to process */
113  next_index = node->cached_next_index;
114 
115  /* First pass: compute hashes */
116  while (n_left_from > 2)
117  {
118  vlib_buffer_t *b0, *b1;
119  u32 bi0, bi1;
120  u8 *h0, *h1;
121  u32 sw_if_index0, sw_if_index1;
122  u32 table_index0, table_index1;
123  vnet_classify_table_t *t0, *t1;
124 
125  /* prefetch next iteration */
126  {
127  vlib_buffer_t *p1, *p2;
128 
129  p1 = vlib_get_buffer (vm, from[1]);
130  p2 = vlib_get_buffer (vm, from[2]);
131 
132  vlib_prefetch_buffer_header (p1, STORE);
134  vlib_prefetch_buffer_header (p2, STORE);
136  }
137 
138  bi0 = from[0];
139  b0 = vlib_get_buffer (vm, bi0);
140 
141  bi1 = from[1];
142  b1 = vlib_get_buffer (vm, bi1);
143 
144  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
145  table_index0 =
146  am->classify_table_index_by_sw_if_index[tid][sw_if_index0];
147 
148  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
149  table_index1 =
150  am->classify_table_index_by_sw_if_index[tid][sw_if_index1];
151 
152  t0 = pool_elt_at_index (vcm->tables, table_index0);
153 
154  t1 = pool_elt_at_index (vcm->tables, table_index1);
155 
157  h0 = (void *) vlib_buffer_get_current (b0) + t0->current_data_offset;
158  else
159  h0 = b0->data;
160 
161  vnet_buffer (b0)->l2_classify.hash =
162  vnet_classify_hash_packet (t0, (u8 *) h0);
163 
164  vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
165 
167  h1 = (void *) vlib_buffer_get_current (b1) + t1->current_data_offset;
168  else
169  h1 = b1->data;
170 
171  vnet_buffer (b1)->l2_classify.hash =
172  vnet_classify_hash_packet (t1, (u8 *) h1);
173 
174  vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);
175 
176  vnet_buffer (b0)->l2_classify.table_index = table_index0;
177 
178  vnet_buffer (b1)->l2_classify.table_index = table_index1;
179 
180  from += 2;
181  n_left_from -= 2;
182  }
183 
184  while (n_left_from > 0)
185  {
186  vlib_buffer_t *b0;
187  u32 bi0;
188  u8 *h0;
189  u32 sw_if_index0;
190  u32 table_index0;
192 
193  bi0 = from[0];
194  b0 = vlib_get_buffer (vm, bi0);
195 
196  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
197  table_index0 =
198  am->classify_table_index_by_sw_if_index[tid][sw_if_index0];
199 
200  t0 = pool_elt_at_index (vcm->tables, table_index0);
201 
203  h0 = (void *) vlib_buffer_get_current (b0) + t0->current_data_offset;
204  else
205  h0 = b0->data;
206 
207  vnet_buffer (b0)->l2_classify.hash =
208  vnet_classify_hash_packet (t0, (u8 *) h0);
209 
210  vnet_buffer (b0)->l2_classify.table_index = table_index0;
211  vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
212 
213  from++;
214  n_left_from--;
215  }
216 
217  next_index = node->cached_next_index;
218  from = vlib_frame_vector_args (frame);
219  n_left_from = frame->n_vectors;
220 
221  while (n_left_from > 0)
222  {
223  u32 n_left_to_next;
224 
225  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
226 
227  /* Not enough load/store slots to dual loop... */
228  while (n_left_from > 0 && n_left_to_next > 0)
229  {
230  u32 bi0;
231  vlib_buffer_t *b0;
232  u32 next0 = ACL_NEXT_INDEX_DENY;
233  u32 table_index0;
235  vnet_classify_entry_t *e0;
236  u64 hash0;
237  u8 *h0;
238  u8 error0;
239 
240  /* Stride 3 seems to work best */
241  if (PREDICT_TRUE (n_left_from > 3))
242  {
243  vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
245  u32 table_index1;
246  u64 phash1;
247 
248  table_index1 = vnet_buffer (p1)->l2_classify.table_index;
249 
250  if (PREDICT_TRUE (table_index1 != ~0))
251  {
252  tp1 = pool_elt_at_index (vcm->tables, table_index1);
253  phash1 = vnet_buffer (p1)->l2_classify.hash;
254  vnet_classify_prefetch_entry (tp1, phash1);
255  }
256  }
257 
258  /* speculatively enqueue b0 to the current next frame */
259  bi0 = from[0];
260  to_next[0] = bi0;
261  from += 1;
262  to_next += 1;
263  n_left_from -= 1;
264  n_left_to_next -= 1;
265 
266  b0 = vlib_get_buffer (vm, bi0);
267 
268  table_index0 = vnet_buffer (b0)->l2_classify.table_index;
269  e0 = 0;
270  t0 = 0;
271 
272  /* Feature bitmap update */
273  vnet_buffer (b0)->l2.feature_bitmap &= ~L2INPUT_FEAT_ACL;
274 
275  vnet_buffer (b0)->l2_classify.opaque_index = ~0;
276  /* Determine the next node */
278  vnet_buffer (b0)->
279  l2.feature_bitmap);
280 
281  if (PREDICT_TRUE (table_index0 != ~0))
282  {
283  hash0 = vnet_buffer (b0)->l2_classify.hash;
284  t0 = pool_elt_at_index (vcm->tables, table_index0);
285 
287  h0 =
288  (void *) vlib_buffer_get_current (b0) +
290  else
291  h0 = b0->data;
292 
293  e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
294  if (e0)
295  {
296  vnet_buffer (b0)->l2_classify.opaque_index
297  = e0->opaque_index;
298  vlib_buffer_advance (b0, e0->advance);
299 
300  next0 = (e0->next_index < ACL_NEXT_INDEX_N_NEXT) ?
301  e0->next_index : next0;
302 
303  hits++;
304 
305  error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
306  L2_INACL_ERROR_SESSION_DENY : L2_INACL_ERROR_NONE;
307  b0->error = node->errors[error0];
308  }
309  else
310  {
311  while (1)
312  {
313  if (PREDICT_TRUE (t0->next_table_index != ~0))
314  t0 = pool_elt_at_index (vcm->tables,
315  t0->next_table_index);
316  else
317  {
318  next0 =
319  (t0->miss_next_index <
321  next0;
322 
323  misses++;
324 
325  error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
326  L2_INACL_ERROR_TABLE_MISS : L2_INACL_ERROR_NONE;
327  b0->error = node->errors[error0];
328  break;
329  }
330 
331  if (t0->current_data_flag ==
333  h0 =
334  (void *) vlib_buffer_get_current (b0) +
336  else
337  h0 = b0->data;
338 
339  hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
341  (t0, (u8 *) h0, hash0, now);
342  if (e0)
343  {
344  vlib_buffer_advance (b0, e0->advance);
345  next0 = (e0->next_index < ACL_NEXT_INDEX_N_NEXT) ?
346  e0->next_index : next0;
347  hits++;
348  chain_hits++;
349 
350  error0 = (next0 == ACL_NEXT_INDEX_DENY) ?
351  L2_INACL_ERROR_SESSION_DENY : L2_INACL_ERROR_NONE;
352  b0->error = node->errors[error0];
353  break;
354  }
355  }
356  }
357  }
358 
360  && (b0->flags & VLIB_BUFFER_IS_TRACED)))
361  {
362  l2_inacl_trace_t *t =
363  vlib_add_trace (vm, node, b0, sizeof (*t));
364  t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
365  t->next_index = next0;
366  t->table_index = t0 ? t0 - vcm->tables : ~0;
367  t->offset = (t0 && e0) ? vnet_classify_get_offset (t0, e0) : ~0;
368  }
369 
370  /* verify speculative enqueue, maybe switch current next frame */
371  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
372  to_next, n_left_to_next,
373  bi0, next0);
374  }
375 
376  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
377  }
378 
380  L2_INACL_ERROR_MISS, misses);
382  L2_INACL_ERROR_HIT, hits);
384  L2_INACL_ERROR_CHAIN_HIT, chain_hits);
385  return frame->n_vectors;
386 }
387 
388 /* *INDENT-OFF* */
390  .function = l2_inacl_node_fn,
391  .name = "l2-input-acl",
392  .vector_size = sizeof (u32),
393  .format_trace = format_l2_inacl_trace,
394  .type = VLIB_NODE_TYPE_INTERNAL,
395 
396  .n_errors = ARRAY_LEN(l2_inacl_error_strings),
397  .error_strings = l2_inacl_error_strings,
398 
399  .n_next_nodes = ACL_NEXT_INDEX_N_NEXT,
400 
401  /* edit / add dispositions here */
402  .next_nodes = {
403  [ACL_NEXT_INDEX_DENY] = "error-drop",
404  },
405 };
406 /* *INDENT-ON* */
407 
410 {
412 
413  mp->vlib_main = vm;
414  mp->vnet_main = vnet_get_main ();
415 
416  /* Initialize the feature next-node indexes */
418  l2_inacl_node.index,
422 
423  return 0;
424 }
425 
427 
428 /*
429  * fd.io coding-style-patch-verification: ON
430  *
431  * Local Variables:
432  * eval: (c-set-style "gnu")
433  * End:
434  */
u64 vnet_classify_hash_packet(vnet_classify_table_t *t, u8 *h)
acl_next_index_t
Definition: input_acl.h:30
#define CLIB_UNUSED(x)
Definition: clib.h:79
vnet_main_t * vnet_get_main(void)
Definition: misc.c:46
u32 * classify_table_index_by_sw_if_index[INPUT_ACL_N_TABLES]
Definition: input_acl.h:38
#define PREDICT_TRUE(x)
Definition: clib.h:98
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:185
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:459
struct _vlib_node_registration vlib_node_registration_t
static u8 * format_l2_inacl_trace(u8 *s, va_list *args)
Definition: l2_input_acl.c:58
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:418
vlib_main_t * vlib_main
Definition: l2_input_acl.c:44
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:418
vnet_classify_main_t * vnet_classify_main
Definition: input_acl.h:43
#define CLASSIFY_FLAG_USE_CURR_DATA
Definition: vnet_classify.h:54
l2_inacl_main_t l2_inacl_main
Definition: l2_input_acl.c:69
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:111
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:164
static char * l2_inacl_error_strings[]
Definition: l2_input_acl.c:90
unsigned long u64
Definition: types.h:89
static void vnet_classify_prefetch_bucket(vnet_classify_table_t *t, u64 hash)
clib_error_t * l2_inacl_init(vlib_main_t *vm)
Definition: l2_input_acl.c:409
static void vnet_classify_prefetch_entry(vnet_classify_table_t *t, u64 hash)
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:397
#define foreach_l2_inacl_error
Definition: l2_input_acl.c:73
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:188
#define PREDICT_FALSE(x)
Definition: clib.h:97
l2_inacl_error_t
Definition: l2_input_acl.c:82
u32 node_index
Node index.
Definition: node.h:436
static u32 feat_bitmap_get_next_node_index(u32 *next_nodes, u32 bitmap)
Return the graph node index for the feature corresponding to the first set bit in the bitmap...
Definition: feat_bitmap.h:79
#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:216
#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:350
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:113
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1112
static uword vnet_classify_get_offset(vnet_classify_table_t *t, vnet_classify_entry_t *v)
u32 feat_next_node_index[32]
Definition: l2_input_acl.c:41
u16 n_vectors
Definition: node.h:344
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:82
vlib_main_t * vm
Definition: buffer.c:276
static void feat_bitmap_init_next_nodes(vlib_main_t *vm, u32 node_index, u32 num_features, char **feat_names, u32 *next_nodes)
Initialize the feature next-node indexes of a graph node.
Definition: feat_bitmap.h:43
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:85
#define ARRAY_LEN(x)
Definition: clib.h:59
char ** l2input_get_feat_names(void)
Return an array of strings containing graph node names of each feature.
Definition: l2_input.c:58
struct _vnet_classify_main vnet_classify_main_t
Definition: vnet_classify.h:69
input_acl_main_t input_acl_main
Definition: input_acl.c:19
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:455
input_acl_table_id_t
Definition: input_acl.h:23
unsigned int u32
Definition: types.h:88
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:201
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:259
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
double f64
Definition: types.h:142
unsigned char u8
Definition: types.h:56
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:253
vnet_main_t * vnet_main
Definition: l2_input_acl.c:45
static uword l2_inacl_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: l2_input_acl.c:97
static vlib_node_registration_t l2_inacl_node
(constructor) VLIB_REGISTER_NODE (l2_inacl_node)
Definition: l2_input_acl.c:71
#define vnet_buffer(b)
Definition: buffer.h:294
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:158
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u8 data[0]
Packet data.
Definition: buffer.h:152
u16 flags
Copy of main node flags.
Definition: node.h:449
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:67
u32 flags
buffer flags: VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:74
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
vnet_classify_entry_t * vnet_classify_find_entry(vnet_classify_table_t *t, u8 *h, u64 hash, f64 now)
Definition: defs.h:46