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 * snap_node.c: snap 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>
43 #include <vnet/snap/snap.h>
48 SNAP_INPUT_NEXT_ETHERNET_TYPE,
56 static u8 * format_snap_input_trace (u8 * s, va_list * va)
58 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
59 CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
60 snap_input_trace_t * t = va_arg (*va, snap_input_trace_t *);
62 s = format (s, "%U", format_snap_header, t->packet_data);
68 snap_input (vlib_main_t * vm,
69 vlib_node_runtime_t * node,
70 vlib_frame_t * from_frame)
72 snap_main_t * sm = &snap_main;
73 u32 n_left_from, next_index, * from, * to_next;
75 from = vlib_frame_vector_args (from_frame);
76 n_left_from = from_frame->n_vectors;
78 if (node->flags & VLIB_NODE_FLAG_TRACE)
79 vlib_trace_frame_buffers_only (vm, node,
83 sizeof (snap_input_trace_t));
85 next_index = node->cached_next_index;
87 while (n_left_from > 0)
91 vlib_get_next_frame (vm, node, next_index,
92 to_next, n_left_to_next);
94 while (n_left_from >= 4 && n_left_to_next >= 2)
97 vlib_buffer_t * b0, * b1;
98 snap_header_t * h0, * h1;
99 snap_protocol_info_t * pi0, * pi1;
100 u8 next0, next1, is_ethernet0, is_ethernet1, len0, len1, enqueue_code;
103 /* Prefetch next iteration. */
105 vlib_buffer_t * b2, * b3;
107 b2 = vlib_get_buffer (vm, from[2]);
108 b3 = vlib_get_buffer (vm, from[3]);
110 vlib_prefetch_buffer_header (b2, LOAD);
111 vlib_prefetch_buffer_header (b3, LOAD);
113 CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
114 CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
126 b0 = vlib_get_buffer (vm, bi0);
127 b1 = vlib_get_buffer (vm, bi1);
129 h0 = (void *) (b0->data + b0->current_data);
130 h1 = (void *) (b1->data + b1->current_data);
132 oui0 = snap_header_get_oui (h0);
133 oui1 = snap_header_get_oui (h1);
135 is_ethernet0 = oui0 == IEEE_OUI_ethernet;
136 is_ethernet1 = oui1 == IEEE_OUI_ethernet;
138 len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0);
139 len1 = sizeof (h1[0]) - (is_ethernet1 ? sizeof (h1->protocol) : 0);
141 b0->current_data += len0;
142 b1->current_data += len1;
144 b0->current_length -= len0;
145 b1->current_length -= len1;
147 pi0 = snap_get_protocol_info (sm, h0);
148 pi1 = snap_get_protocol_info (sm, h1);
150 next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP;
151 next1 = pi1 ? pi1->next_index : SNAP_INPUT_NEXT_DROP;
153 next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0;
154 next1 = is_ethernet1 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next1;
156 /* In case of error. */
157 b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
158 b1->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
160 enqueue_code = (next0 != next_index) + 2*(next1 != next_index);
162 if (PREDICT_FALSE (enqueue_code != 0))
164 switch (enqueue_code)
171 vlib_set_next_frame_buffer (vm, node, next0, bi0);
178 vlib_set_next_frame_buffer (vm, node, next1, bi1);
185 vlib_set_next_frame_buffer (vm, node, next0, bi0);
186 vlib_set_next_frame_buffer (vm, node, next1, bi1);
189 vlib_put_next_frame (vm, node, next_index,
192 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
198 while (n_left_from > 0 && n_left_to_next > 0)
203 snap_protocol_info_t * pi0;
204 u8 next0, is_ethernet0, len0;
214 b0 = vlib_get_buffer (vm, bi0);
216 h0 = (void *) (b0->data + b0->current_data);
218 oui0 = snap_header_get_oui (h0);
220 is_ethernet0 = oui0 == IEEE_OUI_ethernet;
222 len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0);
224 b0->current_data += len0;
226 b0->current_length -= len0;
228 pi0 = snap_get_protocol_info (sm, h0);
230 next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP;
232 next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0;
234 /* In case of error. */
235 b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
237 /* Sent packet to wrong next? */
238 if (PREDICT_FALSE (next0 != next_index))
240 /* Return old frame; remove incorrectly enqueued packet. */
241 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
243 /* Send to correct next. */
245 vlib_get_next_frame (vm, node, next_index,
246 to_next, n_left_to_next);
254 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
257 return from_frame->n_vectors;
260 static char * snap_error_strings[] = {
266 VLIB_REGISTER_NODE (snap_input_node) = {
267 .function = snap_input,
268 .name = "snap-input",
269 /* Takes a vector of packets. */
270 .vector_size = sizeof (u32),
272 .n_errors = SNAP_N_ERROR,
273 .error_strings = snap_error_strings,
275 .n_next_nodes = SNAP_INPUT_N_NEXT,
277 [SNAP_INPUT_NEXT_DROP] = "error-drop",
278 [SNAP_INPUT_NEXT_PUNT] = "error-punt",
279 [SNAP_INPUT_NEXT_ETHERNET_TYPE] = "ethernet-input-type",
282 .format_buffer = format_snap_header_with_length,
283 .format_trace = format_snap_input_trace,
284 .unformat_buffer = unformat_snap_header,
287 static clib_error_t * snap_input_init (vlib_main_t * vm)
290 clib_error_t * error = vlib_call_init_function (vm, snap_init);
292 clib_error_report (error);
295 snap_setup_node (vm, snap_input_node.index);
297 llc_register_input_protocol (vm, LLC_PROTOCOL_snap, snap_input_node.index);
302 VLIB_INIT_FUNCTION (snap_input_init);
305 snap_register_input_protocol (vlib_main_t * vm,
311 snap_main_t * sm = &snap_main;
312 snap_protocol_info_t * pi;
314 snap_oui_and_protocol_t key;
317 clib_error_t * error = vlib_call_init_function (vm, snap_input_init);
319 clib_error_report (error);
322 h.protocol = clib_host_to_net_u16 (protocol);
323 h.oui[0] = (ieee_oui >> 16) & 0xff;
324 h.oui[1] = (ieee_oui >> 8) & 0xff;
325 h.oui[2] = (ieee_oui >> 0) & 0xff;
326 pi = snap_get_protocol_info (sm, &h);
330 vec_add2 (sm->protocols, pi, 1);
332 pi->name = format (0, "%s", name);
333 pi->node_index = node_index;
334 pi->next_index = vlib_node_add_next (vm,
335 snap_input_node.index,
339 key.protocol = clib_host_to_net_u16 (protocol);
341 mhash_set (&sm->protocol_hash, &key, pi - sm->protocols, /* old_value */ 0);
342 hash_set_mem (sm->protocol_info_by_name, name, pi - sm->protocols);