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 * llc_node.c: llc 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/llc/llc.h>
44 #define foreach_llc_input_next \
45 _ (PUNT, "error-punt") \
46 _ (DROP, "error-drop")
49 #define _(s,n) LLC_INPUT_NEXT_##s,
50 foreach_llc_input_next
59 static u8 * format_llc_input_trace (u8 * s, va_list * va)
61 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
62 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
63 llc_input_trace_t * t = va_arg (*va, llc_input_trace_t *);
65 s = format (s, "%U", format_llc_header, t->packet_data);
71 llc_input (vlib_main_t * vm,
72 vlib_node_runtime_t * node,
73 vlib_frame_t * from_frame)
75 llc_main_t * lm = &llc_main;
76 u32 n_left_from, next_index, * from, * to_next;
78 from = vlib_frame_vector_args (from_frame);
79 n_left_from = from_frame->n_vectors;
81 if (node->flags & VLIB_NODE_FLAG_TRACE)
82 vlib_trace_frame_buffers_only (vm, node,
86 sizeof (llc_input_trace_t));
88 next_index = node->cached_next_index;
90 while (n_left_from > 0)
94 vlib_get_next_frame (vm, node, next_index,
95 to_next, n_left_to_next);
97 while (n_left_from >= 4 && n_left_to_next >= 2)
100 vlib_buffer_t * b0, * b1;
101 llc_header_t * h0, * h1;
102 u8 next0, next1, len0, len1, enqueue_code;
104 /* Prefetch next iteration. */
106 vlib_buffer_t * b2, * b3;
108 b2 = vlib_get_buffer (vm, from[2]);
109 b3 = vlib_get_buffer (vm, from[3]);
111 vlib_prefetch_buffer_header (b2, LOAD);
112 vlib_prefetch_buffer_header (b3, LOAD);
114 CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
115 CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
127 b0 = vlib_get_buffer (vm, bi0);
128 b1 = vlib_get_buffer (vm, bi1);
130 h0 = (void *) (b0->data + b0->current_data);
131 h1 = (void *) (b1->data + b1->current_data);
133 len0 = llc_header_length (h0);
134 len1 = llc_header_length (h1);
136 b0->current_data += len0;
137 b1->current_data += len1;
139 b0->current_length -= len0;
140 b1->current_length -= len1;
142 next0 = lm->input_next_by_protocol[h0->dst_sap];
143 next1 = lm->input_next_by_protocol[h1->dst_sap];
145 b0->error = node->errors[next0 == LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL : LLC_ERROR_NONE];
146 b1->error = node->errors[next1 == LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL : LLC_ERROR_NONE];
148 enqueue_code = (next0 != next_index) + 2*(next1 != next_index);
150 if (PREDICT_FALSE (enqueue_code != 0))
152 switch (enqueue_code)
159 vlib_set_next_frame_buffer (vm, node, next0, bi0);
166 vlib_set_next_frame_buffer (vm, node, next1, bi1);
173 vlib_set_next_frame_buffer (vm, node, next0, bi0);
174 vlib_set_next_frame_buffer (vm, node, next1, bi1);
177 vlib_put_next_frame (vm, node, next_index,
180 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
186 while (n_left_from > 0 && n_left_to_next > 0)
200 b0 = vlib_get_buffer (vm, bi0);
202 h0 = (void *) (b0->data + b0->current_data);
204 len0 = llc_header_length (h0);
206 b0->current_data += len0;
208 b0->current_length -= len0;
210 next0 = lm->input_next_by_protocol[h0->dst_sap];
212 b0->error = node->errors[next0 == LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL : LLC_ERROR_NONE];
214 /* Sent packet to wrong next? */
215 if (PREDICT_FALSE (next0 != next_index))
217 /* Return old frame; remove incorrectly enqueued packet. */
218 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
220 /* Send to correct next. */
222 vlib_get_next_frame (vm, node, next_index,
223 to_next, n_left_to_next);
231 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
234 return from_frame->n_vectors;
237 static char * llc_error_strings[] = {
243 VLIB_REGISTER_NODE (llc_input_node) = {
244 .function = llc_input,
246 /* Takes a vector of packets. */
247 .vector_size = sizeof (u32),
249 .n_errors = LLC_N_ERROR,
250 .error_strings = llc_error_strings,
252 .n_next_nodes = LLC_INPUT_N_NEXT,
254 #define _(s,n) [LLC_INPUT_NEXT_##s] = n,
255 foreach_llc_input_next
259 .format_buffer = format_llc_header_with_length,
260 .format_trace = format_llc_input_trace,
261 .unformat_buffer = unformat_llc_header,
264 static clib_error_t * llc_input_init (vlib_main_t * vm)
266 llc_main_t * lm = &llc_main;
269 clib_error_t * error = vlib_call_init_function (vm, llc_init);
271 clib_error_report (error);
274 llc_setup_node (vm, llc_input_node.index);
278 for (i = 0; i < ARRAY_LEN (lm->input_next_by_protocol); i++)
279 lm->input_next_by_protocol[i] = LLC_INPUT_NEXT_DROP;
285 VLIB_INIT_FUNCTION (llc_input_init);
288 llc_register_input_protocol (vlib_main_t * vm,
289 llc_protocol_t protocol,
292 llc_main_t * lm = &llc_main;
293 llc_protocol_info_t * pi;
296 clib_error_t * error = vlib_call_init_function (vm, llc_input_init);
298 clib_error_report (error);
299 /* Otherwise, osi_input_init will wipe out e.g. the snap init */
300 error = vlib_call_init_function (vm, osi_input_init);
302 clib_error_report (error);
305 pi = llc_get_protocol_info (lm, protocol);
306 pi->node_index = node_index;
307 pi->next_index = vlib_node_add_next (vm,
308 llc_input_node.index,
311 lm->input_next_by_protocol[protocol] = pi->next_index;