Line data Source code
1 : /*
2 : * node.c: MPLS input
3 : *
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:
8 : *
9 : * http://www.apache.org/licenses/LICENSE-2.0
10 : *
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.
16 : */
17 :
18 : #include <vlib/vlib.h>
19 : #include <vnet/pg/pg.h>
20 : #include <vnet/mpls/mpls.h>
21 : #include <vnet/feature/feature.h>
22 : #include <vnet/mpls/mpls.api_enum.h>
23 :
24 : typedef struct {
25 : u32 next_index;
26 : u32 label_net_byte_order;
27 : } mpls_input_trace_t;
28 :
29 : #define foreach_mpls_input_next \
30 : _(DROP, "error-drop") \
31 : _(LOOKUP, "mpls-lookup")
32 :
33 : typedef enum {
34 : #define _(s,n) MPLS_INPUT_NEXT_##s,
35 : foreach_mpls_input_next
36 : #undef _
37 : MPLS_INPUT_N_NEXT,
38 : } mpls_input_next_t;
39 :
40 : static u8 *
41 5371 : format_mpls_input_trace (u8 * s, va_list * args)
42 : {
43 5371 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
44 5371 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
45 5371 : mpls_input_trace_t * t = va_arg (*args, mpls_input_trace_t *);
46 : char * next_name;
47 : u32 label;
48 5371 : next_name = "BUG!";
49 5371 : label = clib_net_to_host_u32(t->label_net_byte_order);
50 :
51 : #define _(a,b) if (t->next_index == MPLS_INPUT_NEXT_##a) next_name = b;
52 5371 : foreach_mpls_input_next;
53 : #undef _
54 :
55 5371 : s = format (s, "MPLS: next %s[%d] label %d ttl %d exp %d",
56 : next_name, t->next_index,
57 : vnet_mpls_uc_get_label(label),
58 : vnet_mpls_uc_get_ttl(label),
59 : vnet_mpls_uc_get_exp(label));
60 :
61 5371 : return s;
62 : }
63 :
64 : typedef struct {
65 : u32 last_label;
66 : u32 last_inner_fib_index;
67 : u32 last_outer_fib_index;
68 : mpls_main_t * mpls_main;
69 : } mpls_input_runtime_t;
70 :
71 : static inline uword
72 121 : mpls_input_inline (vlib_main_t * vm,
73 : vlib_node_runtime_t * node,
74 : vlib_frame_t * from_frame)
75 : {
76 : u32 n_left_from, next_index, * from, * to_next;
77 121 : mpls_main_t * mm = &mpls_main;
78 121 : u32 thread_index = vlib_get_thread_index();
79 : vlib_simple_counter_main_t * cm;
80 121 : vnet_main_t * vnm = vnet_get_main();
81 :
82 121 : from = vlib_frame_vector_args (from_frame);
83 121 : n_left_from = from_frame->n_vectors;
84 :
85 121 : next_index = node->cached_next_index;
86 :
87 121 : cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
88 : VNET_INTERFACE_COUNTER_MPLS);
89 :
90 242 : while (n_left_from > 0)
91 : {
92 : u32 n_left_to_next;
93 :
94 121 : vlib_get_next_frame (vm, node, next_index,
95 : to_next, n_left_to_next);
96 :
97 5961 : while (n_left_from >= 4 && n_left_to_next >= 2)
98 : {
99 : u32 bi0, next0, sw_if_index0;
100 : u32 bi1, next1, sw_if_index1;
101 : vlib_buffer_t *b0, *b1;
102 : char *h0, *h1;
103 :
104 : /* Prefetch next iteration. */
105 : {
106 : vlib_buffer_t * p2, * p3;
107 :
108 5840 : p2 = vlib_get_buffer (vm, from[2]);
109 5840 : p3 = vlib_get_buffer (vm, from[3]);
110 :
111 5840 : vlib_prefetch_buffer_header (p2, LOAD);
112 5840 : vlib_prefetch_buffer_header (p3, LOAD);
113 :
114 5840 : CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
115 5840 : CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
116 : }
117 :
118 5840 : bi0 = to_next[0] = from[0];
119 5840 : bi1 = to_next[1] = from[1];
120 :
121 5840 : from += 2;
122 5840 : to_next += 2;
123 5840 : n_left_from -= 2;
124 5840 : n_left_to_next -= 2;
125 :
126 5840 : b0 = vlib_get_buffer (vm, bi0);
127 5840 : b1 = vlib_get_buffer (vm, bi1);
128 :
129 5840 : h0 = vlib_buffer_get_current (b0);
130 5840 : h1 = vlib_buffer_get_current (b1);
131 :
132 5840 : sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
133 5840 : sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
134 :
135 : /* TTL expired? */
136 5840 : if (PREDICT_FALSE(h0[3] == 0))
137 : {
138 127 : next0 = MPLS_INPUT_NEXT_DROP;
139 127 : b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
140 : }
141 : else
142 : {
143 5713 : next0 = MPLS_INPUT_NEXT_LOOKUP;
144 5713 : vnet_feature_arc_start(mm->input_feature_arc_index,
145 : sw_if_index0, &next0, b0);
146 5713 : vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
147 : }
148 :
149 5840 : if (PREDICT_FALSE(h1[3] == 0))
150 : {
151 127 : next1 = MPLS_INPUT_NEXT_DROP;
152 127 : b1->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
153 : }
154 : else
155 : {
156 5713 : next1 = MPLS_INPUT_NEXT_LOOKUP;
157 5713 : vnet_feature_arc_start(mm->input_feature_arc_index,
158 : sw_if_index1, &next1, b1);
159 5713 : vlib_increment_simple_counter (cm, thread_index, sw_if_index1, 1);
160 : }
161 :
162 5840 : if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
163 : {
164 5840 : mpls_input_trace_t *tr = vlib_add_trace (vm, node,
165 : b0, sizeof (*tr));
166 5840 : tr->next_index = next0;
167 5840 : tr->label_net_byte_order = *((u32*)h0);
168 : }
169 5840 : if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
170 : {
171 5840 : mpls_input_trace_t *tr = vlib_add_trace (vm, node,
172 : b1, sizeof (*tr));
173 5840 : tr->next_index = next1;
174 5840 : tr->label_net_byte_order = *((u32*)h1);
175 : }
176 :
177 5840 : vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
178 : to_next, n_left_to_next,
179 : bi0, bi1,
180 : next0, next1);
181 : }
182 :
183 341 : while (n_left_from > 0 && n_left_to_next > 0)
184 : {
185 : u32 sw_if_index0, next0, bi0;
186 : vlib_buffer_t * b0;
187 : char * h0;
188 :
189 220 : bi0 = from[0];
190 220 : to_next[0] = bi0;
191 220 : from += 1;
192 220 : to_next += 1;
193 220 : n_left_from -= 1;
194 220 : n_left_to_next -= 1;
195 :
196 220 : b0 = vlib_get_buffer (vm, bi0);
197 220 : h0 = vlib_buffer_get_current (b0);
198 220 : sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
199 :
200 : /* TTL expired? */
201 220 : if (PREDICT_FALSE(h0[3] == 0))
202 : {
203 3 : next0 = MPLS_INPUT_NEXT_DROP;
204 3 : b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
205 : }
206 : else
207 : {
208 217 : next0 = MPLS_INPUT_NEXT_LOOKUP;
209 217 : vnet_feature_arc_start(mm->input_feature_arc_index, sw_if_index0, &next0, b0);
210 217 : vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
211 : }
212 :
213 220 : if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
214 : {
215 220 : mpls_input_trace_t *tr = vlib_add_trace (vm, node,
216 : b0, sizeof (*tr));
217 220 : tr->next_index = next0;
218 220 : tr->label_net_byte_order = *(u32*)h0;
219 : }
220 :
221 220 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
222 : to_next, n_left_to_next,
223 : bi0, next0);
224 : }
225 :
226 121 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
227 : }
228 121 : vlib_node_increment_counter (vm, mpls_input_node.index,
229 121 : MPLS_ERROR_PKTS_DECAP, from_frame->n_vectors);
230 121 : return from_frame->n_vectors;
231 : }
232 :
233 2357 : VLIB_NODE_FN (mpls_input_node) (vlib_main_t * vm,
234 : vlib_node_runtime_t * node,
235 : vlib_frame_t * from_frame)
236 : {
237 121 : return mpls_input_inline (vm, node, from_frame);
238 : }
239 :
240 178120 : VLIB_REGISTER_NODE (mpls_input_node) = {
241 : .name = "mpls-input",
242 : /* Takes a vector of packets. */
243 : .vector_size = sizeof (u32),
244 :
245 : .runtime_data_bytes = sizeof(mpls_input_runtime_t),
246 :
247 : .n_errors = MPLS_N_ERROR,
248 : .error_counters = mpls_error_counters,
249 :
250 : .n_next_nodes = MPLS_INPUT_N_NEXT,
251 : .next_nodes = {
252 : #define _(s,n) [MPLS_INPUT_NEXT_##s] = n,
253 : foreach_mpls_input_next
254 : #undef _
255 : },
256 :
257 : .format_buffer = format_mpls_unicast_header_net_byte_order,
258 : .format_trace = format_mpls_input_trace,
259 : };
260 :
261 : #ifndef CLIB_MARCH_VARIANT
262 : static void
263 559 : mpls_setup_nodes (vlib_main_t * vm)
264 : {
265 : pg_node_t * pn;
266 :
267 559 : pn = pg_get_node (mpls_input_node.index);
268 559 : pn->unformat_edit = unformat_pg_mpls_header;
269 :
270 559 : ethernet_register_input_type (vm, ETHERNET_TYPE_MPLS,
271 : mpls_input_node.index);
272 559 : }
273 :
274 559 : static clib_error_t * mpls_input_init (vlib_main_t * vm)
275 : {
276 559 : mpls_setup_nodes (vm);
277 :
278 559 : return 0;
279 : }
280 :
281 : /* *INDENT-OFF* */
282 63279 : VLIB_INIT_FUNCTION (mpls_input_init) =
283 : {
284 : .runs_after = VLIB_INITS("mpls_init"),
285 : };
286 : /* *INDENT-ON* */
287 : #endif /* CLIB_MARCH_VARIANT */
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