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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
16 * osi_node.c: osi packet processing
18 * Copyright (c) 2010 Eliot Dresselhaus
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:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
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.
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>
47 #define foreach_osi_input_next \
48 _ (PUNT, "error-punt") \
49 _ (DROP, "error-drop")
53 #define _(s,n) OSI_INPUT_NEXT_##s,
54 foreach_osi_input_next
65 format_osi_input_trace (u8 * s, va_list * va)
67 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
68 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
69 osi_input_trace_t *t = va_arg (*va, osi_input_trace_t *);
71 s = format (s, "%U", format_osi_header, t->packet_data);
77 osi_input (vlib_main_t * vm,
78 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
80 osi_main_t *lm = &osi_main;
81 u32 n_left_from, next_index, *from, *to_next;
83 from = vlib_frame_vector_args (from_frame);
84 n_left_from = from_frame->n_vectors;
86 if (node->flags & VLIB_NODE_FLAG_TRACE)
87 vlib_trace_frame_buffers_only (vm, node,
91 sizeof (osi_input_trace_t));
93 next_index = node->cached_next_index;
95 while (n_left_from > 0)
99 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
101 while (n_left_from >= 4 && n_left_to_next >= 2)
104 vlib_buffer_t *b0, *b1;
105 osi_header_t *h0, *h1;
106 u8 next0, next1, enqueue_code;
108 /* Prefetch next iteration. */
110 vlib_buffer_t *b2, *b3;
112 b2 = vlib_get_buffer (vm, from[2]);
113 b3 = vlib_get_buffer (vm, from[3]);
115 vlib_prefetch_buffer_header (b2, LOAD);
116 vlib_prefetch_buffer_header (b3, LOAD);
118 CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
119 CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
131 b0 = vlib_get_buffer (vm, bi0);
132 b1 = vlib_get_buffer (vm, bi1);
134 h0 = (void *) (b0->data + b0->current_data);
135 h1 = (void *) (b1->data + b1->current_data);
137 next0 = lm->input_next_by_protocol[h0->protocol];
138 next1 = lm->input_next_by_protocol[h1->protocol];
141 node->errors[next0 ==
142 OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL :
145 node->errors[next1 ==
146 OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL :
149 enqueue_code = (next0 != next_index) + 2 * (next1 != next_index);
151 if (PREDICT_FALSE (enqueue_code != 0))
153 switch (enqueue_code)
160 vlib_set_next_frame_buffer (vm, node, next0, bi0);
167 vlib_set_next_frame_buffer (vm, node, next1, bi1);
174 vlib_set_next_frame_buffer (vm, node, next0, bi0);
175 vlib_set_next_frame_buffer (vm, node, next1, bi1);
178 vlib_put_next_frame (vm, node, next_index,
181 vlib_get_next_frame (vm, node, next_index, to_next,
188 while (n_left_from > 0 && n_left_to_next > 0)
202 b0 = vlib_get_buffer (vm, bi0);
204 h0 = (void *) (b0->data + b0->current_data);
206 next0 = lm->input_next_by_protocol[h0->protocol];
209 node->errors[next0 ==
210 OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL :
213 /* Sent packet to wrong next? */
214 if (PREDICT_FALSE (next0 != next_index))
216 /* Return old frame; remove incorrectly enqueued packet. */
217 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
219 /* Send to correct next. */
221 vlib_get_next_frame (vm, node, next_index, to_next,
230 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
233 return from_frame->n_vectors;
236 static char *osi_error_strings[] = {
243 VLIB_REGISTER_NODE (osi_input_node) = {
244 .function = osi_input,
246 /* Takes a vector of packets. */
247 .vector_size = sizeof (u32),
249 .n_errors = OSI_N_ERROR,
250 .error_strings = osi_error_strings,
252 .n_next_nodes = OSI_INPUT_N_NEXT,
254 #define _(s,n) [OSI_INPUT_NEXT_##s] = n,
255 foreach_osi_input_next
259 .format_buffer = format_osi_header_with_length,
260 .format_trace = format_osi_input_trace,
261 .unformat_buffer = unformat_osi_header,
265 static clib_error_t *
266 osi_input_init (vlib_main_t * vm)
268 clib_error_t *error = 0;
269 osi_main_t *lm = &osi_main;
271 if ((error = vlib_call_init_function (vm, osi_init)))
274 osi_setup_node (vm, osi_input_node.index);
278 for (i = 0; i < ARRAY_LEN (lm->input_next_by_protocol); i++)
279 lm->input_next_by_protocol[i] = OSI_INPUT_NEXT_DROP;
282 ppp_register_input_protocol (vm, PPP_PROTOCOL_osi, osi_input_node.index);
283 hdlc_register_input_protocol (vm, HDLC_PROTOCOL_osi, osi_input_node.index);
284 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer1,
285 osi_input_node.index);
286 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer2,
287 osi_input_node.index);
288 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer3,
289 osi_input_node.index);
290 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer4,
291 osi_input_node.index);
292 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer5,
293 osi_input_node.index);
298 VLIB_INIT_FUNCTION (osi_input_init);
301 osi_register_input_protocol (osi_protocol_t protocol, u32 node_index)
303 osi_main_t *lm = &osi_main;
304 vlib_main_t *vm = lm->vlib_main;
305 osi_protocol_info_t *pi;
308 clib_error_t *error = vlib_call_init_function (vm, osi_input_init);
310 clib_error_report (error);
313 pi = osi_get_protocol_info (lm, protocol);
314 pi->node_index = node_index;
315 pi->next_index = vlib_node_add_next (vm, osi_input_node.index, node_index);
317 lm->input_next_by_protocol[protocol] = pi->next_index;
321 * fd.io coding-style-patch-verification: ON
324 * eval: (c-set-style "gnu")