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/llc/llc.h>
43 #define foreach_llc_input_next \
44 _ (PUNT, "error-punt") \
45 _ (DROP, "error-drop")
49 #define _(s,n) LLC_INPUT_NEXT_##s,
50 foreach_llc_input_next
61 format_llc_input_trace (u8 * s, va_list * va)
63 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
64 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
65 llc_input_trace_t *t = va_arg (*va, llc_input_trace_t *);
67 s = format (s, "%U", format_llc_header, t->packet_data);
73 llc_input (vlib_main_t * vm,
74 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
76 llc_main_t *lm = &llc_main;
77 u32 n_left_from, next_index, *from, *to_next;
79 from = vlib_frame_vector_args (from_frame);
80 n_left_from = from_frame->n_vectors;
82 if (node->flags & VLIB_NODE_FLAG_TRACE)
83 vlib_trace_frame_buffers_only (vm, node,
87 sizeof (llc_input_trace_t));
89 next_index = node->cached_next_index;
91 while (n_left_from > 0)
95 vlib_get_next_frame (vm, node, next_index, 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 = vlib_buffer_get_current (b0);
131 h1 = vlib_buffer_get_current (b1);
133 len0 = llc_header_length (h0);
134 len1 = llc_header_length (h1);
136 vlib_buffer_advance (b0, len0);
137 vlib_buffer_advance (b1, len1);
139 next0 = lm->input_next_by_protocol[h0->dst_sap];
140 next1 = lm->input_next_by_protocol[h1->dst_sap];
143 node->errors[next0 ==
144 LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL :
147 node->errors[next1 ==
148 LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL :
151 enqueue_code = (next0 != next_index) + 2 * (next1 != next_index);
153 if (PREDICT_FALSE (enqueue_code != 0))
155 switch (enqueue_code)
162 vlib_set_next_frame_buffer (vm, node, next0, bi0);
169 vlib_set_next_frame_buffer (vm, node, next1, bi1);
176 vlib_set_next_frame_buffer (vm, node, next0, bi0);
177 vlib_set_next_frame_buffer (vm, node, next1, bi1);
180 vlib_put_next_frame (vm, node, next_index,
183 vlib_get_next_frame (vm, node, next_index, to_next,
190 while (n_left_from > 0 && n_left_to_next > 0)
204 b0 = vlib_get_buffer (vm, bi0);
206 h0 = vlib_buffer_get_current (b0);
208 len0 = llc_header_length (h0);
210 vlib_buffer_advance (b0, len0);
212 next0 = lm->input_next_by_protocol[h0->dst_sap];
215 node->errors[next0 ==
216 LLC_INPUT_NEXT_DROP ? LLC_ERROR_UNKNOWN_PROTOCOL :
219 /* Sent packet to wrong next? */
220 if (PREDICT_FALSE (next0 != next_index))
222 /* Return old frame; remove incorrectly enqueued packet. */
223 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
225 /* Send to correct next. */
227 vlib_get_next_frame (vm, node, next_index,
228 to_next, n_left_to_next);
236 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
239 return from_frame->n_vectors;
242 static char *llc_error_strings[] = {
249 VLIB_REGISTER_NODE (llc_input_node) = {
250 .function = llc_input,
252 /* Takes a vector of packets. */
253 .vector_size = sizeof (u32),
255 .n_errors = LLC_N_ERROR,
256 .error_strings = llc_error_strings,
258 .n_next_nodes = LLC_INPUT_N_NEXT,
260 #define _(s,n) [LLC_INPUT_NEXT_##s] = n,
261 foreach_llc_input_next
265 .format_buffer = format_llc_header_with_length,
266 .format_trace = format_llc_input_trace,
267 .unformat_buffer = unformat_llc_header,
271 static clib_error_t *
272 llc_input_init (vlib_main_t * vm)
274 llc_main_t *lm = &llc_main;
277 clib_error_t *error = vlib_call_init_function (vm, llc_init);
279 clib_error_report (error);
282 llc_setup_node (vm, llc_input_node.index);
286 for (i = 0; i < ARRAY_LEN (lm->input_next_by_protocol); i++)
287 lm->input_next_by_protocol[i] = LLC_INPUT_NEXT_DROP;
293 VLIB_INIT_FUNCTION (llc_input_init);
296 llc_register_input_protocol (vlib_main_t * vm,
297 llc_protocol_t protocol, u32 node_index)
299 llc_main_t *lm = &llc_main;
300 llc_protocol_info_t *pi;
303 clib_error_t *error = vlib_call_init_function (vm, llc_input_init);
305 clib_error_report (error);
306 /* Otherwise, osi_input_init will wipe out e.g. the snap init */
307 error = vlib_call_init_function (vm, osi_input_init);
309 clib_error_report (error);
312 pi = llc_get_protocol_info (lm, protocol);
313 pi->node_index = node_index;
314 pi->next_index = vlib_node_add_next (vm, llc_input_node.index, node_index);
316 lm->input_next_by_protocol[protocol] = pi->next_index;
320 * fd.io coding-style-patch-verification: ON
323 * eval: (c-set-style "gnu")