4 * Copyright (c) 2012-2014 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vlib/vlib.h>
19 #include <vnet/pg/pg.h>
20 #include <vnet/mpls/mpls.h>
21 #include <vnet/feature/feature.h>
25 u32 label_host_byte_order;
29 format_mpls_input_trace (u8 * s, va_list * args)
31 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
32 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
33 mpls_input_trace_t * t = va_arg (*args, mpls_input_trace_t *);
38 #define _(a,b) if (t->next_index == MPLS_INPUT_NEXT_##a) next_name = b;
39 foreach_mpls_input_next;
42 s = format (s, "MPLS: next %s[%d] label %d ttl %d",
43 next_name, t->next_index,
44 vnet_mpls_uc_get_label(t->label_host_byte_order),
45 vnet_mpls_uc_get_ttl(t->label_host_byte_order));
50 vlib_node_registration_t mpls_input_node;
54 u32 last_inner_fib_index;
55 u32 last_outer_fib_index;
56 mpls_main_t * mpls_main;
57 } mpls_input_runtime_t;
60 mpls_input_inline (vlib_main_t * vm,
61 vlib_node_runtime_t * node,
62 vlib_frame_t * from_frame)
64 u32 n_left_from, next_index, * from, * to_next;
65 mpls_input_runtime_t * rt;
67 u32 cpu_index = os_get_cpu_number();
68 vlib_simple_counter_main_t * cm;
69 vnet_main_t * vnm = vnet_get_main();
71 from = vlib_frame_vector_args (from_frame);
72 n_left_from = from_frame->n_vectors;
73 rt = vlib_node_get_runtime_data (vm, mpls_input_node.index);
76 * Force an initial lookup every time, in case the control-plane
77 * changed the label->FIB mapping.
81 next_index = node->cached_next_index;
83 cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
84 VNET_INTERFACE_COUNTER_MPLS);
86 while (n_left_from > 0)
90 vlib_get_next_frame (vm, node, next_index,
91 to_next, n_left_to_next);
93 while (n_left_from >= 4 && n_left_to_next >= 2)
95 u32 label0, bi0, next0, sw_if_index0;
96 u32 label1, bi1, next1, sw_if_index1;
97 mpls_unicast_header_t *h0, *h1;
98 vlib_buffer_t *b0, *b1;
100 /* Prefetch next iteration. */
102 vlib_buffer_t * p2, * p3;
104 p2 = vlib_get_buffer (vm, from[2]);
105 p3 = vlib_get_buffer (vm, from[3]);
107 vlib_prefetch_buffer_header (p2, STORE);
108 vlib_prefetch_buffer_header (p3, STORE);
110 CLIB_PREFETCH (p2->data, sizeof (h0[0]), STORE);
111 CLIB_PREFETCH (p3->data, sizeof (h1[0]), STORE);
115 bi0 = to_next[0] = from[0];
116 bi1 = to_next[1] = from[1];
123 b0 = vlib_get_buffer (vm, bi0);
124 b1 = vlib_get_buffer (vm, bi1);
126 h0 = vlib_buffer_get_current (b0);
127 h1 = vlib_buffer_get_current (b1);
129 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
130 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
132 label0 = clib_net_to_host_u32 (h0->label_exp_s_ttl);
133 label1 = clib_net_to_host_u32 (h1->label_exp_s_ttl);
136 if (PREDICT_FALSE(vnet_mpls_uc_get_ttl (label0) == 0))
138 next0 = MPLS_INPUT_NEXT_DROP;
139 b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
143 next0 = MPLS_INPUT_NEXT_LOOKUP;
144 vnet_feature_arc_start(mm->input_feature_arc_index, sw_if_index0, &next0, b0);
145 vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
148 if (PREDICT_FALSE(vnet_mpls_uc_get_ttl (label1) == 0))
150 next1 = MPLS_INPUT_NEXT_DROP;
151 b1->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
155 next1 = MPLS_INPUT_NEXT_LOOKUP;
156 vnet_feature_arc_start(mm->input_feature_arc_index, sw_if_index1, &next1, b1);
157 vlib_increment_simple_counter (cm, cpu_index, sw_if_index1, 1);
160 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
162 mpls_input_trace_t *tr = vlib_add_trace (vm, node,
164 tr->next_index = next0;
165 tr->label_host_byte_order = label0;
167 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
169 mpls_input_trace_t *tr = vlib_add_trace (vm, node,
171 tr->next_index = next1;
172 tr->label_host_byte_order = label1;
175 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
176 to_next, n_left_to_next,
177 bi0, bi1, next0, next1);
180 while (n_left_from > 0 && n_left_to_next > 0)
184 mpls_unicast_header_t * h0;
196 b0 = vlib_get_buffer (vm, bi0);
197 h0 = vlib_buffer_get_current (b0);
198 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
200 label0 = clib_net_to_host_u32 (h0->label_exp_s_ttl);
202 if (PREDICT_FALSE(vnet_mpls_uc_get_ttl (label0) == 0))
204 next0 = MPLS_INPUT_NEXT_DROP;
205 b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
209 vnet_feature_arc_start(mm->input_feature_arc_index, sw_if_index0, &next0, b0);
210 vlib_increment_simple_counter (cm, cpu_index, sw_if_index0, 1);
213 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
215 mpls_input_trace_t *tr = vlib_add_trace (vm, node,
217 tr->next_index = next0;
218 tr->label_host_byte_order = label0;
221 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
222 to_next, n_left_to_next,
226 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
228 vlib_node_increment_counter (vm, mpls_input_node.index,
229 MPLS_ERROR_PKTS_DECAP, from_frame->n_vectors);
230 return from_frame->n_vectors;
234 mpls_input (vlib_main_t * vm,
235 vlib_node_runtime_t * node,
236 vlib_frame_t * from_frame)
238 return mpls_input_inline (vm, node, from_frame);
241 static char * mpls_error_strings[] = {
242 #define mpls_error(n,s) s,
247 VLIB_REGISTER_NODE (mpls_input_node) = {
248 .function = mpls_input,
249 .name = "mpls-input",
250 /* Takes a vector of packets. */
251 .vector_size = sizeof (u32),
253 .runtime_data_bytes = sizeof(mpls_input_runtime_t),
255 .n_errors = MPLS_N_ERROR,
256 .error_strings = mpls_error_strings,
258 .n_next_nodes = MPLS_INPUT_N_NEXT,
260 #define _(s,n) [MPLS_INPUT_NEXT_##s] = n,
261 foreach_mpls_input_next
265 .format_buffer = format_mpls_unicast_header_net_byte_order,
266 .format_trace = format_mpls_input_trace,
269 VLIB_NODE_FUNCTION_MULTIARCH (mpls_input_node, mpls_input)
272 mpls_setup_nodes (vlib_main_t * vm)
274 mpls_input_runtime_t * rt;
277 pn = pg_get_node (mpls_input_node.index);
278 pn->unformat_edit = unformat_pg_mpls_header;
280 rt = vlib_node_get_runtime_data (vm, mpls_input_node.index);
281 rt->last_label = (u32) ~0;
282 rt->last_inner_fib_index = 0;
283 rt->last_outer_fib_index = 0;
284 rt->mpls_main = &mpls_main;
286 ethernet_register_input_type (vm, ETHERNET_TYPE_MPLS_UNICAST,
287 mpls_input_node.index);
290 static clib_error_t * mpls_input_init (vlib_main_t * vm)
292 clib_error_t * error;
294 error = vlib_call_init_function (vm, mpls_init);
296 clib_error_report (error);
298 mpls_setup_nodes (vm);
303 VLIB_INIT_FUNCTION (mpls_input_init);