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")
52 #define _(s,n) OSI_INPUT_NEXT_##s,
53 foreach_osi_input_next
62 static u8 * format_osi_input_trace (u8 * s, va_list * va)
64 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
65 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
66 osi_input_trace_t * t = va_arg (*va, osi_input_trace_t *);
68 s = format (s, "%U", format_osi_header, t->packet_data);
74 osi_input (vlib_main_t * vm,
75 vlib_node_runtime_t * node,
76 vlib_frame_t * from_frame)
78 osi_main_t * lm = &osi_main;
79 u32 n_left_from, next_index, * from, * to_next;
81 from = vlib_frame_vector_args (from_frame);
82 n_left_from = from_frame->n_vectors;
84 if (node->flags & VLIB_NODE_FLAG_TRACE)
85 vlib_trace_frame_buffers_only (vm, node,
89 sizeof (osi_input_trace_t));
91 next_index = node->cached_next_index;
93 while (n_left_from > 0)
97 vlib_get_next_frame (vm, node, next_index,
98 to_next, n_left_to_next);
100 while (n_left_from >= 4 && n_left_to_next >= 2)
103 vlib_buffer_t * b0, * b1;
104 osi_header_t * h0, * h1;
105 u8 next0, next1, enqueue_code;
107 /* Prefetch next iteration. */
109 vlib_buffer_t * b2, * b3;
111 b2 = vlib_get_buffer (vm, from[2]);
112 b3 = vlib_get_buffer (vm, from[3]);
114 vlib_prefetch_buffer_header (b2, LOAD);
115 vlib_prefetch_buffer_header (b3, LOAD);
117 CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
118 CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
130 b0 = vlib_get_buffer (vm, bi0);
131 b1 = vlib_get_buffer (vm, bi1);
133 h0 = (void *) (b0->data + b0->current_data);
134 h1 = (void *) (b1->data + b1->current_data);
136 next0 = lm->input_next_by_protocol[h0->protocol];
137 next1 = lm->input_next_by_protocol[h1->protocol];
139 b0->error = node->errors[next0 == OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL : OSI_ERROR_NONE];
140 b1->error = node->errors[next1 == OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL : OSI_ERROR_NONE];
142 enqueue_code = (next0 != next_index) + 2*(next1 != next_index);
144 if (PREDICT_FALSE (enqueue_code != 0))
146 switch (enqueue_code)
153 vlib_set_next_frame_buffer (vm, node, next0, bi0);
160 vlib_set_next_frame_buffer (vm, node, next1, bi1);
167 vlib_set_next_frame_buffer (vm, node, next0, bi0);
168 vlib_set_next_frame_buffer (vm, node, next1, bi1);
171 vlib_put_next_frame (vm, node, next_index,
174 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
180 while (n_left_from > 0 && n_left_to_next > 0)
194 b0 = vlib_get_buffer (vm, bi0);
196 h0 = (void *) (b0->data + b0->current_data);
198 next0 = lm->input_next_by_protocol[h0->protocol];
200 b0->error = node->errors[next0 == OSI_INPUT_NEXT_DROP ? OSI_ERROR_UNKNOWN_PROTOCOL : OSI_ERROR_NONE];
202 /* Sent packet to wrong next? */
203 if (PREDICT_FALSE (next0 != next_index))
205 /* Return old frame; remove incorrectly enqueued packet. */
206 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
208 /* Send to correct next. */
210 vlib_get_next_frame (vm, node, next_index,
211 to_next, n_left_to_next);
219 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
222 return from_frame->n_vectors;
225 static char * osi_error_strings[] = {
231 VLIB_REGISTER_NODE (osi_input_node) = {
232 .function = osi_input,
234 /* Takes a vector of packets. */
235 .vector_size = sizeof (u32),
237 .n_errors = OSI_N_ERROR,
238 .error_strings = osi_error_strings,
240 .n_next_nodes = OSI_INPUT_N_NEXT,
242 #define _(s,n) [OSI_INPUT_NEXT_##s] = n,
243 foreach_osi_input_next
247 .format_buffer = format_osi_header_with_length,
248 .format_trace = format_osi_input_trace,
249 .unformat_buffer = unformat_osi_header,
252 static clib_error_t * osi_input_init (vlib_main_t * vm)
254 clib_error_t * error = 0;
255 osi_main_t * lm = &osi_main;
257 if ((error = vlib_call_init_function (vm, osi_init)))
260 osi_setup_node (vm, osi_input_node.index);
264 for (i = 0; i < ARRAY_LEN (lm->input_next_by_protocol); i++)
265 lm->input_next_by_protocol[i] = OSI_INPUT_NEXT_DROP;
268 ppp_register_input_protocol (vm, PPP_PROTOCOL_osi, osi_input_node.index);
269 hdlc_register_input_protocol (vm, HDLC_PROTOCOL_osi, osi_input_node.index);
270 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer1, osi_input_node.index);
271 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer2, osi_input_node.index);
272 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer3, osi_input_node.index);
273 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer4, osi_input_node.index);
274 llc_register_input_protocol (vm, LLC_PROTOCOL_osi_layer5, osi_input_node.index);
279 VLIB_INIT_FUNCTION (osi_input_init);
282 osi_register_input_protocol (osi_protocol_t protocol,
285 osi_main_t * lm = &osi_main;
286 vlib_main_t * vm = lm->vlib_main;
287 osi_protocol_info_t * pi;
290 clib_error_t * error = vlib_call_init_function (vm, osi_input_init);
292 clib_error_report (error);
295 pi = osi_get_protocol_info (lm, protocol);
296 pi->node_index = node_index;
297 pi->next_index = vlib_node_add_next (vm,
298 osi_input_node.index,
301 lm->input_next_by_protocol[protocol] = pi->next_index;