Line data Source code
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 : * osi_node.c: osi 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/osi/osi.h>
43 : #include <vnet/ppp/ppp.h>
44 : #include <vnet/hdlc/hdlc.h>
45 : #include <vnet/llc/llc.h>
46 :
47 : #define foreach_osi_input_next \
48 : _ (PUNT, "error-punt") \
49 : _ (DROP, "error-drop")
50 :
51 : typedef enum
52 : {
53 : #define _(s,n) OSI_INPUT_NEXT_##s,
54 : foreach_osi_input_next
55 : #undef _
56 : OSI_INPUT_N_NEXT,
57 : } osi_input_next_t;
58 :
59 : typedef struct
60 : {
61 : u8 packet_data[32];
62 : } osi_input_trace_t;
63 :
64 : static u8 *
65 0 : format_osi_input_trace (u8 * s, va_list * va)
66 : {
67 0 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
68 0 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
69 0 : osi_input_trace_t *t = va_arg (*va, osi_input_trace_t *);
70 :
71 0 : s = format (s, "%U", format_osi_header, t->packet_data);
72 :
73 0 : return s;
74 : }
75 :
76 : static uword
77 0 : osi_input (vlib_main_t * vm,
78 : vlib_node_runtime_t * node, vlib_frame_t * from_frame)
79 : {
80 0 : osi_main_t *lm = &osi_main;
81 : u32 n_left_from, next_index, *from, *to_next;
82 :
83 0 : from = vlib_frame_vector_args (from_frame);
84 0 : n_left_from = from_frame->n_vectors;
85 :
86 0 : if (node->flags & VLIB_NODE_FLAG_TRACE)
87 0 : vlib_trace_frame_buffers_only (vm, node,
88 : from,
89 : n_left_from,
90 : sizeof (from[0]),
91 : sizeof (osi_input_trace_t));
92 :
93 0 : next_index = node->cached_next_index;
94 :
95 0 : while (n_left_from > 0)
96 : {
97 : u32 n_left_to_next;
98 :
99 0 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
100 :
101 0 : while (n_left_from >= 4 && n_left_to_next >= 2)
102 : {
103 : u32 bi0, bi1;
104 : vlib_buffer_t *b0, *b1;
105 : osi_header_t *h0, *h1;
106 : u8 next0, next1, enqueue_code;
107 :
108 : /* Prefetch next iteration. */
109 : {
110 : vlib_buffer_t *b2, *b3;
111 :
112 0 : b2 = vlib_get_buffer (vm, from[2]);
113 0 : b3 = vlib_get_buffer (vm, from[3]);
114 :
115 0 : vlib_prefetch_buffer_header (b2, LOAD);
116 0 : vlib_prefetch_buffer_header (b3, LOAD);
117 :
118 0 : CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
119 0 : CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
120 : }
121 :
122 0 : bi0 = from[0];
123 0 : bi1 = from[1];
124 0 : to_next[0] = bi0;
125 0 : to_next[1] = bi1;
126 0 : from += 2;
127 0 : to_next += 2;
128 0 : n_left_to_next -= 2;
129 0 : n_left_from -= 2;
130 :
131 0 : b0 = vlib_get_buffer (vm, bi0);
132 0 : b1 = vlib_get_buffer (vm, bi1);
133 :
134 0 : h0 = vlib_buffer_get_current (b0);
135 0 : h1 = vlib_buffer_get_current (b1);
136 :
137 0 : next0 = lm->input_next_by_protocol[h0->protocol];
138 0 : next1 = lm->input_next_by_protocol[h1->protocol];
139 :
140 0 : b0->error =
141 0 : node->errors[next0 ==
142 : OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL :
143 : OSI_ERROR_NONE];
144 0 : b1->error =
145 0 : node->errors[next1 ==
146 : OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL :
147 : OSI_ERROR_NONE];
148 :
149 0 : enqueue_code = (next0 != next_index) + 2 * (next1 != next_index);
150 :
151 0 : if (PREDICT_FALSE (enqueue_code != 0))
152 : {
153 0 : switch (enqueue_code)
154 : {
155 0 : case 1:
156 : /* A B A */
157 0 : to_next[-2] = bi1;
158 0 : to_next -= 1;
159 0 : n_left_to_next += 1;
160 0 : vlib_set_next_frame_buffer (vm, node, next0, bi0);
161 0 : break;
162 :
163 0 : case 2:
164 : /* A A B */
165 0 : to_next -= 1;
166 0 : n_left_to_next += 1;
167 0 : vlib_set_next_frame_buffer (vm, node, next1, bi1);
168 0 : break;
169 :
170 0 : case 3:
171 : /* A B B or A B C */
172 0 : to_next -= 2;
173 0 : n_left_to_next += 2;
174 0 : vlib_set_next_frame_buffer (vm, node, next0, bi0);
175 0 : vlib_set_next_frame_buffer (vm, node, next1, bi1);
176 0 : if (next0 == next1)
177 : {
178 0 : vlib_put_next_frame (vm, node, next_index,
179 : n_left_to_next);
180 0 : next_index = next1;
181 0 : vlib_get_next_frame (vm, node, next_index, to_next,
182 : n_left_to_next);
183 : }
184 : }
185 : }
186 : }
187 :
188 0 : while (n_left_from > 0 && n_left_to_next > 0)
189 : {
190 : u32 bi0;
191 : vlib_buffer_t *b0;
192 : osi_header_t *h0;
193 : u8 next0;
194 :
195 0 : bi0 = from[0];
196 0 : to_next[0] = bi0;
197 0 : from += 1;
198 0 : to_next += 1;
199 0 : n_left_from -= 1;
200 0 : n_left_to_next -= 1;
201 :
202 0 : b0 = vlib_get_buffer (vm, bi0);
203 :
204 0 : h0 = vlib_buffer_get_current (b0);
205 :
206 0 : next0 = lm->input_next_by_protocol[h0->protocol];
207 :
208 0 : b0->error =
209 0 : node->errors[next0 ==
210 : OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL :
211 : OSI_ERROR_NONE];
212 :
213 : /* Sent packet to wrong next? */
214 0 : if (PREDICT_FALSE (next0 != next_index))
215 : {
216 : /* Return old frame; remove incorrectly enqueued packet. */
217 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
218 :
219 : /* Send to correct next. */
220 0 : next_index = next0;
221 0 : vlib_get_next_frame (vm, node, next_index, to_next,
222 : n_left_to_next);
223 :
224 0 : to_next[0] = bi0;
225 0 : to_next += 1;
226 0 : n_left_to_next -= 1;
227 : }
228 : }
229 :
230 0 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
231 : }
232 :
233 0 : return from_frame->n_vectors;
234 : }
235 :
236 : static char *osi_error_strings[] = {
237 : #define _(f,s) s,
238 : foreach_osi_error
239 : #undef _
240 : };
241 :
242 : /* *INDENT-OFF* */
243 178120 : VLIB_REGISTER_NODE (osi_input_node) = {
244 : .function = osi_input,
245 : .name = "osi-input",
246 : /* Takes a vector of packets. */
247 : .vector_size = sizeof (u32),
248 :
249 : .n_errors = OSI_N_ERROR,
250 : .error_strings = osi_error_strings,
251 :
252 : .n_next_nodes = OSI_INPUT_N_NEXT,
253 : .next_nodes = {
254 : #define _(s,n) [OSI_INPUT_NEXT_##s] = n,
255 : foreach_osi_input_next
256 : #undef _
257 : },
258 :
259 : .format_buffer = format_osi_header_with_length,
260 : .format_trace = format_osi_input_trace,
261 : .unformat_buffer = unformat_osi_header,
262 : };
263 : /* *INDENT-ON* */
264 :
265 : static void
266 559 : osi_setup_node (vlib_main_t *vm, u32 node_index)
267 : {
268 559 : vlib_node_t *n = vlib_get_node (vm, node_index);
269 559 : pg_node_t *pn = pg_get_node (node_index);
270 :
271 559 : n->format_buffer = format_osi_header_with_length;
272 559 : n->unformat_buffer = unformat_osi_header;
273 559 : pn->unformat_edit = unformat_pg_osi_header;
274 559 : }
275 :
276 : static clib_error_t *
277 559 : osi_input_init (vlib_main_t * vm)
278 : {
279 559 : clib_error_t *error = 0;
280 559 : osi_main_t *lm = &osi_main;
281 :
282 559 : if ((error = vlib_call_init_function (vm, osi_init)))
283 0 : return error;
284 :
285 559 : osi_setup_node (vm, osi_input_node.index);
286 :
287 : {
288 : int i;
289 143663 : for (i = 0; i < ARRAY_LEN (lm->input_next_by_protocol); i++)
290 143104 : lm->input_next_by_protocol[i] = OSI_INPUT_NEXT_DROP;
291 : }
292 :
293 559 : ppp_register_input_protocol (vm, PPP_PROTOCOL_osi, osi_input_node.index);
294 559 : hdlc_register_input_protocol (vm, HDLC_PROTOCOL_osi, osi_input_node.index);
295 559 : llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer1,
296 : osi_input_node.index);
297 559 : llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer2,
298 : osi_input_node.index);
299 559 : llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer3,
300 : osi_input_node.index);
301 559 : llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer4,
302 : osi_input_node.index);
303 559 : llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer5,
304 : osi_input_node.index);
305 :
306 559 : return 0;
307 : }
308 :
309 55999 : VLIB_INIT_FUNCTION (osi_input_init);
310 :
311 : void
312 0 : osi_register_input_protocol (osi_protocol_t protocol, u32 node_index)
313 : {
314 0 : osi_main_t *lm = &osi_main;
315 0 : vlib_main_t *vm = lm->vlib_main;
316 : osi_protocol_info_t *pi;
317 :
318 : {
319 0 : clib_error_t *error = vlib_call_init_function (vm, osi_input_init);
320 0 : if (error)
321 0 : clib_error_report (error);
322 : }
323 :
324 0 : pi = osi_get_protocol_info (lm, protocol);
325 0 : pi->node_index = node_index;
326 0 : pi->next_index = vlib_node_add_next (vm, osi_input_node.index, node_index);
327 :
328 0 : lm->input_next_by_protocol[protocol] = pi->next_index;
329 0 : }
330 :
331 : /*
332 : * fd.io coding-style-patch-verification: ON
333 : *
334 : * Local Variables:
335 : * eval: (c-set-style "gnu")
336 : * End:
337 : */
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