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>
49 SNAP_INPUT_NEXT_ETHERNET_TYPE,
59 format_snap_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 snap_input_trace_t *t = va_arg (*va, snap_input_trace_t *);
65 s = format (s, "%U", format_snap_header, t->packet_data);
71 snap_input (vlib_main_t * vm,
72 vlib_node_runtime_t * node, vlib_frame_t * from_frame)
74 snap_main_t *sm = &snap_main;
75 u32 n_left_from, next_index, *from, *to_next;
77 from = vlib_frame_vector_args (from_frame);
78 n_left_from = from_frame->n_vectors;
80 if (node->flags & VLIB_NODE_FLAG_TRACE)
81 vlib_trace_frame_buffers_only (vm, node,
85 sizeof (snap_input_trace_t));
87 next_index = node->cached_next_index;
89 while (n_left_from > 0)
93 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
95 while (n_left_from >= 4 && n_left_to_next >= 2)
98 vlib_buffer_t *b0, *b1;
99 snap_header_t *h0, *h1;
100 snap_protocol_info_t *pi0, *pi1;
101 u8 next0, next1, is_ethernet0, is_ethernet1, len0, len1,
105 /* Prefetch next iteration. */
107 vlib_buffer_t *b2, *b3;
109 b2 = vlib_get_buffer (vm, from[2]);
110 b3 = vlib_get_buffer (vm, from[3]);
112 vlib_prefetch_buffer_header (b2, LOAD);
113 vlib_prefetch_buffer_header (b3, LOAD);
115 CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD);
116 CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD);
128 b0 = vlib_get_buffer (vm, bi0);
129 b1 = vlib_get_buffer (vm, bi1);
131 h0 = vlib_buffer_get_current (b0);
132 h1 = vlib_buffer_get_current (b1);
134 oui0 = snap_header_get_oui (h0);
135 oui1 = snap_header_get_oui (h1);
137 is_ethernet0 = oui0 == IEEE_OUI_ethernet;
138 is_ethernet1 = oui1 == IEEE_OUI_ethernet;
140 len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0);
141 len1 = sizeof (h1[0]) - (is_ethernet1 ? sizeof (h1->protocol) : 0);
143 vlib_buffer_advance (b0, len0);
144 vlib_buffer_advance (b1, len1);
146 pi0 = snap_get_protocol_info (sm, h0);
147 pi1 = snap_get_protocol_info (sm, h1);
149 next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP;
150 next1 = pi1 ? pi1->next_index : SNAP_INPUT_NEXT_DROP;
152 next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0;
153 next1 = is_ethernet1 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next1;
155 /* In case of error. */
156 b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
157 b1->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
159 enqueue_code = (next0 != next_index) + 2 * (next1 != next_index);
161 if (PREDICT_FALSE (enqueue_code != 0))
163 switch (enqueue_code)
170 vlib_set_next_frame_buffer (vm, node, next0, bi0);
177 vlib_set_next_frame_buffer (vm, node, next1, bi1);
184 vlib_set_next_frame_buffer (vm, node, next0, bi0);
185 vlib_set_next_frame_buffer (vm, node, next1, bi1);
188 vlib_put_next_frame (vm, node, next_index,
191 vlib_get_next_frame (vm, node, next_index, 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 = vlib_buffer_get_current (b0);
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 vlib_buffer_advance (b0, len0);
226 pi0 = snap_get_protocol_info (sm, h0);
228 next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP;
230 next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0;
232 /* In case of error. */
233 b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL];
235 /* Sent packet to wrong next? */
236 if (PREDICT_FALSE (next0 != next_index))
238 /* Return old frame; remove incorrectly enqueued packet. */
239 vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);
241 /* Send to correct next. */
243 vlib_get_next_frame (vm, node, next_index,
244 to_next, n_left_to_next);
252 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
255 return from_frame->n_vectors;
258 static char *snap_error_strings[] = {
265 VLIB_REGISTER_NODE (snap_input_node) = {
266 .function = snap_input,
267 .name = "snap-input",
268 /* Takes a vector of packets. */
269 .vector_size = sizeof (u32),
271 .n_errors = SNAP_N_ERROR,
272 .error_strings = snap_error_strings,
274 .n_next_nodes = SNAP_INPUT_N_NEXT,
276 [SNAP_INPUT_NEXT_DROP] = "error-drop",
277 [SNAP_INPUT_NEXT_PUNT] = "error-punt",
278 [SNAP_INPUT_NEXT_ETHERNET_TYPE] = "ethernet-input-type",
281 .format_buffer = format_snap_header_with_length,
282 .format_trace = format_snap_input_trace,
283 .unformat_buffer = unformat_snap_header,
287 static clib_error_t *
288 snap_input_init (vlib_main_t * vm)
291 clib_error_t *error = vlib_call_init_function (vm, snap_init);
293 clib_error_report (error);
296 snap_setup_node (vm, snap_input_node.index);
298 llc_register_input_protocol (vm, LLC_PROTOCOL_snap, snap_input_node.index);
303 VLIB_INIT_FUNCTION (snap_input_init);
306 snap_register_input_protocol (vlib_main_t * vm,
308 u32 ieee_oui, u16 protocol, u32 node_index)
310 snap_main_t *sm = &snap_main;
311 snap_protocol_info_t *pi;
313 snap_oui_and_protocol_t key;
316 clib_error_t *error = vlib_call_init_function (vm, snap_input_init);
318 clib_error_report (error);
321 h.protocol = clib_host_to_net_u16 (protocol);
322 h.oui[0] = (ieee_oui >> 16) & 0xff;
323 h.oui[1] = (ieee_oui >> 8) & 0xff;
324 h.oui[2] = (ieee_oui >> 0) & 0xff;
325 pi = snap_get_protocol_info (sm, &h);
329 vec_add2 (sm->protocols, pi, 1);
331 pi->name = format (0, "%s", name);
332 pi->node_index = node_index;
333 pi->next_index = vlib_node_add_next (vm, snap_input_node.index, node_index);
336 key.protocol = clib_host_to_net_u16 (protocol);
338 mhash_set (&sm->protocol_hash, &key, pi - sm->protocols, /* old_value */ 0);
339 hash_set_mem (sm->protocol_info_by_name, name, pi - sm->protocols);
343 * fd.io coding-style-patch-verification: ON
346 * eval: (c-set-style "gnu")