Line data Source code
1 : /*
2 : * l2_input_vtr.c : layer 2 input vlan tag rewrite 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/ethernet/ethernet.h>
21 : #include <vnet/ethernet/packet.h>
22 : #include <vnet/l2/l2_input.h>
23 : #include <vnet/l2/feat_bitmap.h>
24 : #include <vnet/l2/l2_vtr.h>
25 : #include <vnet/l2/l2_input_vtr.h>
26 : #include <vnet/l2/l2_output.h>
27 :
28 : #include <vppinfra/error.h>
29 : #include <vppinfra/cache.h>
30 :
31 :
32 : typedef struct
33 : {
34 : /* per-pkt trace data */
35 : u8 src[6];
36 : u8 dst[6];
37 : u8 raw[12]; /* raw data (vlans) */
38 : u32 sw_if_index;
39 : } l2_invtr_trace_t;
40 :
41 : /* packet trace format function */
42 : static u8 *
43 784 : format_l2_invtr_trace (u8 * s, va_list * args)
44 : {
45 784 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
46 784 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
47 784 : l2_invtr_trace_t *t = va_arg (*args, l2_invtr_trace_t *);
48 :
49 784 : s = format (s, "l2-input-vtr: sw_if_index %d dst %U src %U data "
50 : "%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
51 : t->sw_if_index,
52 784 : format_ethernet_address, t->dst,
53 784 : format_ethernet_address, t->src,
54 784 : t->raw[0], t->raw[1], t->raw[2], t->raw[3], t->raw[4],
55 784 : t->raw[5], t->raw[6], t->raw[7], t->raw[8], t->raw[9],
56 784 : t->raw[10], t->raw[11]);
57 784 : return s;
58 : }
59 :
60 : #ifndef CLIB_MARCH_VARIANT
61 : l2_invtr_main_t l2_invtr_main;
62 : #endif /* CLIB_MARCH_VARIANT */
63 :
64 : #define foreach_l2_invtr_error \
65 : _(L2_INVTR, "L2 inverter packets") \
66 : _(DROP, "L2 input tag rewrite drops")
67 :
68 : typedef enum
69 : {
70 : #define _(sym,str) L2_INVTR_ERROR_##sym,
71 : foreach_l2_invtr_error
72 : #undef _
73 : L2_INVTR_N_ERROR,
74 : } l2_invtr_error_t;
75 :
76 : static char *l2_invtr_error_strings[] = {
77 : #define _(sym,string) string,
78 : foreach_l2_invtr_error
79 : #undef _
80 : };
81 :
82 : typedef enum
83 : {
84 : L2_INVTR_NEXT_DROP,
85 : L2_INVTR_N_NEXT,
86 : } l2_invtr_next_t;
87 :
88 :
89 2348 : VLIB_NODE_FN (l2_invtr_node) (vlib_main_t * vm,
90 : vlib_node_runtime_t * node,
91 : vlib_frame_t * frame)
92 : {
93 : u32 n_left_from, *from, *to_next;
94 : l2_invtr_next_t next_index;
95 48 : l2_invtr_main_t *msm = &l2_invtr_main;
96 :
97 48 : from = vlib_frame_vector_args (frame);
98 48 : n_left_from = frame->n_vectors; /* number of packets to process */
99 48 : next_index = node->cached_next_index;
100 :
101 96 : while (n_left_from > 0)
102 : {
103 : u32 n_left_to_next;
104 :
105 : /* get space to enqueue frame to graph node "next_index" */
106 48 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
107 :
108 454 : while (n_left_from >= 6 && n_left_to_next >= 2)
109 : {
110 : u32 bi0, bi1;
111 : vlib_buffer_t *b0, *b1;
112 : u32 next0, next1;
113 : u32 sw_if_index0, sw_if_index1;
114 :
115 : /* Prefetch next iteration. */
116 : {
117 : vlib_buffer_t *p2, *p3, *p4, *p5;
118 : u32 sw_if_index2, sw_if_index3;
119 :
120 406 : p2 = vlib_get_buffer (vm, from[2]);
121 406 : p3 = vlib_get_buffer (vm, from[3]);
122 406 : p4 = vlib_get_buffer (vm, from[4]);
123 406 : p5 = vlib_get_buffer (vm, from[5]);
124 :
125 : /* Prefetch the buffer header and packet for the N+2 loop iteration */
126 406 : vlib_prefetch_buffer_header (p4, LOAD);
127 406 : vlib_prefetch_buffer_header (p5, LOAD);
128 :
129 406 : clib_prefetch_store (p4->data);
130 406 : clib_prefetch_store (p5->data);
131 :
132 : /*
133 : * Prefetch the input config for the N+1 loop iteration
134 : * This depends on the buffer header above
135 : */
136 406 : sw_if_index2 = vnet_buffer (p2)->sw_if_index[VLIB_RX];
137 406 : sw_if_index3 = vnet_buffer (p3)->sw_if_index[VLIB_RX];
138 406 : CLIB_PREFETCH (vec_elt_at_index
139 : (l2output_main.configs, sw_if_index2),
140 : CLIB_CACHE_LINE_BYTES, LOAD);
141 406 : CLIB_PREFETCH (vec_elt_at_index
142 : (l2output_main.configs, sw_if_index3),
143 : CLIB_CACHE_LINE_BYTES, LOAD);
144 : }
145 :
146 : /* speculatively enqueue b0 and b1 to the current next frame */
147 : /* bi is "buffer index", b is pointer to the buffer */
148 406 : to_next[0] = bi0 = from[0];
149 406 : to_next[1] = bi1 = from[1];
150 406 : from += 2;
151 406 : to_next += 2;
152 406 : n_left_from -= 2;
153 406 : n_left_to_next -= 2;
154 :
155 406 : b0 = vlib_get_buffer (vm, bi0);
156 406 : b1 = vlib_get_buffer (vm, bi1);
157 :
158 : /* RX interface handles */
159 406 : sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
160 406 : sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
161 :
162 : /* Determine the next node */
163 406 : next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
164 : L2INPUT_FEAT_VTR);
165 406 : next1 = vnet_l2_feature_next (b1, msm->feat_next_node_index,
166 : L2INPUT_FEAT_VTR);
167 :
168 : l2_output_config_t *config0;
169 : l2_output_config_t *config1;
170 406 : config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
171 406 : config1 = vec_elt_at_index (l2output_main.configs, sw_if_index1);
172 :
173 406 : if (PREDICT_FALSE (config0->out_vtr_flag))
174 : {
175 406 : if (config0->output_vtr.push_and_pop_bytes)
176 : {
177 : /* perform the tag rewrite on two packets */
178 406 : if (l2_vtr_process (b0, &config0->input_vtr))
179 : {
180 : /* Drop packet */
181 0 : next0 = L2_INVTR_NEXT_DROP;
182 0 : b0->error = node->errors[L2_INVTR_ERROR_DROP];
183 : }
184 : }
185 0 : else if (config0->output_pbb_vtr.push_and_pop_bytes)
186 : {
187 0 : if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
188 : {
189 : /* Drop packet */
190 0 : next0 = L2_INVTR_NEXT_DROP;
191 0 : b0->error = node->errors[L2_INVTR_ERROR_DROP];
192 : }
193 : }
194 : }
195 406 : if (PREDICT_FALSE (config1->out_vtr_flag))
196 : {
197 406 : if (config1->output_vtr.push_and_pop_bytes)
198 : {
199 406 : if (l2_vtr_process (b1, &config1->input_vtr))
200 : {
201 : /* Drop packet */
202 0 : next1 = L2_INVTR_NEXT_DROP;
203 0 : b1->error = node->errors[L2_INVTR_ERROR_DROP];
204 : }
205 : }
206 0 : else if (config1->output_pbb_vtr.push_and_pop_bytes)
207 : {
208 0 : if (l2_pbb_process (b1, &(config1->input_pbb_vtr)))
209 : {
210 : /* Drop packet */
211 0 : next1 = L2_INVTR_NEXT_DROP;
212 0 : b1->error = node->errors[L2_INVTR_ERROR_DROP];
213 : }
214 : }
215 : }
216 :
217 406 : if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
218 : {
219 406 : if (b0->flags & VLIB_BUFFER_IS_TRACED)
220 : {
221 : l2_invtr_trace_t *t =
222 406 : vlib_add_trace (vm, node, b0, sizeof (*t));
223 406 : ethernet_header_t *h0 = vlib_buffer_get_current (b0);
224 406 : t->sw_if_index = sw_if_index0;
225 406 : clib_memcpy_fast (t->src, h0->src_address, 6);
226 406 : clib_memcpy_fast (t->dst, h0->dst_address, 6);
227 406 : clib_memcpy_fast (t->raw, &h0->type, sizeof (t->raw));
228 : }
229 406 : if (b1->flags & VLIB_BUFFER_IS_TRACED)
230 : {
231 : l2_invtr_trace_t *t =
232 406 : vlib_add_trace (vm, node, b1, sizeof (*t));
233 406 : ethernet_header_t *h1 = vlib_buffer_get_current (b1);
234 406 : t->sw_if_index = sw_if_index0;
235 406 : clib_memcpy_fast (t->src, h1->src_address, 6);
236 406 : clib_memcpy_fast (t->dst, h1->dst_address, 6);
237 406 : clib_memcpy_fast (t->raw, &h1->type, sizeof (t->raw));
238 : }
239 : }
240 :
241 : /* verify speculative enqueues, maybe switch current next frame */
242 : /* if next0==next1==next_index then nothing special needs to be done */
243 406 : vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
244 : to_next, n_left_to_next,
245 : bi0, bi1, next0, next1);
246 : }
247 :
248 126 : while (n_left_from > 0 && n_left_to_next > 0)
249 : {
250 : u32 bi0;
251 : vlib_buffer_t *b0;
252 : u32 next0;
253 : u32 sw_if_index0;
254 :
255 : /* speculatively enqueue b0 to the current next frame */
256 78 : bi0 = from[0];
257 78 : to_next[0] = bi0;
258 78 : from += 1;
259 78 : to_next += 1;
260 78 : n_left_from -= 1;
261 78 : n_left_to_next -= 1;
262 :
263 78 : b0 = vlib_get_buffer (vm, bi0);
264 :
265 78 : sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
266 :
267 : /* Determine the next node */
268 78 : next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
269 : L2INPUT_FEAT_VTR);
270 :
271 : l2_output_config_t *config0;
272 78 : config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
273 :
274 78 : if (PREDICT_FALSE (config0->out_vtr_flag))
275 : {
276 78 : if (config0->output_vtr.push_and_pop_bytes)
277 : {
278 : /* perform the tag rewrite on one packet */
279 78 : if (l2_vtr_process (b0, &config0->input_vtr))
280 : {
281 : /* Drop packet */
282 0 : next0 = L2_INVTR_NEXT_DROP;
283 0 : b0->error = node->errors[L2_INVTR_ERROR_DROP];
284 : }
285 : }
286 0 : else if (config0->output_pbb_vtr.push_and_pop_bytes)
287 : {
288 0 : if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
289 : {
290 : /* Drop packet */
291 0 : next0 = L2_INVTR_NEXT_DROP;
292 0 : b0->error = node->errors[L2_INVTR_ERROR_DROP];
293 : }
294 : }
295 : }
296 :
297 78 : if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
298 : && (b0->flags & VLIB_BUFFER_IS_TRACED)))
299 : {
300 : l2_invtr_trace_t *t =
301 78 : vlib_add_trace (vm, node, b0, sizeof (*t));
302 78 : ethernet_header_t *h0 = vlib_buffer_get_current (b0);
303 78 : t->sw_if_index = sw_if_index0;
304 78 : clib_memcpy_fast (t->src, h0->src_address, 6);
305 78 : clib_memcpy_fast (t->dst, h0->dst_address, 6);
306 78 : clib_memcpy_fast (t->raw, &h0->type, sizeof (t->raw));
307 : }
308 :
309 : /* verify speculative enqueue, maybe switch current next frame */
310 78 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
311 : to_next, n_left_to_next,
312 : bi0, next0);
313 : }
314 :
315 48 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
316 : }
317 :
318 48 : return frame->n_vectors;
319 : }
320 :
321 :
322 : /* *INDENT-OFF* */
323 183788 : VLIB_REGISTER_NODE (l2_invtr_node) = {
324 : .name = "l2-input-vtr",
325 : .vector_size = sizeof (u32),
326 : .format_trace = format_l2_invtr_trace,
327 : .type = VLIB_NODE_TYPE_INTERNAL,
328 :
329 : .n_errors = ARRAY_LEN(l2_invtr_error_strings),
330 : .error_strings = l2_invtr_error_strings,
331 :
332 : .n_next_nodes = L2_INVTR_N_NEXT,
333 :
334 : /* edit / add dispositions here */
335 : .next_nodes = {
336 : [L2_INVTR_NEXT_DROP] = "error-drop",
337 : },
338 : };
339 : /* *INDENT-ON* */
340 :
341 : #ifndef CLIB_MARCH_VARIANT
342 : clib_error_t *
343 575 : l2_invtr_init (vlib_main_t * vm)
344 : {
345 575 : l2_invtr_main_t *mp = &l2_invtr_main;
346 :
347 575 : mp->vlib_main = vm;
348 575 : mp->vnet_main = vnet_get_main ();
349 :
350 : /* Initialize the feature next-node indexes */
351 575 : feat_bitmap_init_next_nodes (vm,
352 : l2_invtr_node.index,
353 : L2INPUT_N_FEAT,
354 : l2input_get_feat_names (),
355 575 : mp->feat_next_node_index);
356 :
357 575 : return 0;
358 : }
359 :
360 20735 : VLIB_INIT_FUNCTION (l2_invtr_init);
361 : #endif /* CLIB_MARCH_VARIANT */
362 :
363 :
364 : /*
365 : * fd.io coding-style-patch-verification: ON
366 : *
367 : * Local Variables:
368 : * eval: (c-set-style "gnu")
369 : * End:
370 : */
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