dhcp ip: DSCP settings for transmitted DHCP packets
[vpp.git] / src / vnet / mpls / mpls_input.c
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
23 typedef struct {
24   u32 next_index;
25   u32 label_net_byte_order;
26 } mpls_input_trace_t;
27
28 #define foreach_mpls_input_next                 \
29 _(DROP, "error-drop")                           \
30 _(LOOKUP, "mpls-lookup")
31
32 typedef enum {
33 #define _(s,n) MPLS_INPUT_NEXT_##s,
34   foreach_mpls_input_next
35 #undef _
36   MPLS_INPUT_N_NEXT,
37 } mpls_input_next_t;
38
39 static u8 *
40 format_mpls_input_trace (u8 * s, va_list * args)
41 {
42   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
43   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
44   mpls_input_trace_t * t = va_arg (*args, mpls_input_trace_t *);
45   char * next_name;
46   u32 label;
47   next_name = "BUG!";
48   label = clib_net_to_host_u32(t->label_net_byte_order);
49
50 #define _(a,b) if (t->next_index == MPLS_INPUT_NEXT_##a) next_name = b;
51   foreach_mpls_input_next;
52 #undef _
53
54   s = format (s, "MPLS: next %s[%d]  label %d ttl %d exp %d",
55               next_name, t->next_index,
56               vnet_mpls_uc_get_label(label),
57               vnet_mpls_uc_get_ttl(label),
58               vnet_mpls_uc_get_exp(label));
59
60   return s;
61 }
62
63 typedef struct {
64   u32 last_label;
65   u32 last_inner_fib_index;
66   u32 last_outer_fib_index;
67   mpls_main_t * mpls_main;
68 } mpls_input_runtime_t;
69
70 static inline uword
71 mpls_input_inline (vlib_main_t * vm,
72                    vlib_node_runtime_t * node,
73                    vlib_frame_t * from_frame)
74 {
75   u32 n_left_from, next_index, * from, * to_next;
76   mpls_main_t * mm = &mpls_main;
77   u32 thread_index = vlib_get_thread_index();
78   vlib_simple_counter_main_t * cm;
79   vnet_main_t * vnm = vnet_get_main();
80
81   from = vlib_frame_vector_args (from_frame);
82   n_left_from = from_frame->n_vectors;
83
84   next_index = node->cached_next_index;
85
86   cm = vec_elt_at_index (vnm->interface_main.sw_if_counters,
87                          VNET_INTERFACE_COUNTER_MPLS);
88
89   while (n_left_from > 0)
90     {
91       u32 n_left_to_next;
92
93       vlib_get_next_frame (vm, node, next_index,
94                            to_next, n_left_to_next);
95
96       while (n_left_from >= 4 && n_left_to_next >= 2)
97         {
98           u32 bi0, next0, sw_if_index0;
99           u32 bi1, next1, sw_if_index1;
100           vlib_buffer_t *b0, *b1;
101           char *h0, *h1;
102
103           /* Prefetch next iteration. */
104           {
105               vlib_buffer_t * p2, * p3;
106
107               p2 = vlib_get_buffer (vm, from[2]);
108               p3 = vlib_get_buffer (vm, from[3]);
109
110               vlib_prefetch_buffer_header (p2, LOAD);
111               vlib_prefetch_buffer_header (p3, LOAD);
112
113               CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
114               CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
115           }
116
117           bi0 = to_next[0] = from[0];
118           bi1 = to_next[1] = from[1];
119
120           from += 2;
121           to_next += 2;
122           n_left_from -= 2;
123           n_left_to_next -= 2;
124
125           b0 = vlib_get_buffer (vm, bi0);
126           b1 = vlib_get_buffer (vm, bi1);
127
128           h0 = vlib_buffer_get_current (b0);
129           h1 = vlib_buffer_get_current (b1);
130
131           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
132           sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
133
134           /* TTL expired? */
135           if (PREDICT_FALSE(h0[3] == 0))
136           {
137               next0 = MPLS_INPUT_NEXT_DROP;
138               b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
139           }
140           else
141           {
142               next0 = MPLS_INPUT_NEXT_LOOKUP;
143               vnet_feature_arc_start(mm->input_feature_arc_index,
144                                      sw_if_index0, &next0, b0);
145               vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
146           }
147
148           if (PREDICT_FALSE(h1[3] == 0))
149           {
150               next1 = MPLS_INPUT_NEXT_DROP;
151               b1->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
152           }
153           else
154           {
155               next1 = MPLS_INPUT_NEXT_LOOKUP;
156               vnet_feature_arc_start(mm->input_feature_arc_index,
157                                      sw_if_index1, &next1, b1);
158               vlib_increment_simple_counter (cm, thread_index, sw_if_index1, 1);
159           }
160
161           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
162           {
163               mpls_input_trace_t *tr = vlib_add_trace (vm, node,
164                                                        b0, sizeof (*tr));
165               tr->next_index = next0;
166               tr->label_net_byte_order = *((u32*)h0);
167           }
168           if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
169           {
170               mpls_input_trace_t *tr = vlib_add_trace (vm, node,
171                                                        b1, sizeof (*tr));
172               tr->next_index = next1;
173               tr->label_net_byte_order = *((u32*)h1);
174           }
175
176           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
177                                            to_next, n_left_to_next,
178                                            bi0, bi1,
179                                            next0, next1);
180         }
181
182       while (n_left_from > 0 && n_left_to_next > 0)
183         {
184           u32 sw_if_index0, next0, bi0;
185           vlib_buffer_t * b0;
186           char * h0;
187
188           bi0 = from[0];
189           to_next[0] = bi0;
190           from += 1;
191           to_next += 1;
192           n_left_from -= 1;
193           n_left_to_next -= 1;
194
195           b0 = vlib_get_buffer (vm, bi0);
196           h0 = vlib_buffer_get_current (b0);
197           sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
198
199           /* TTL expired? */
200           if (PREDICT_FALSE(h0[3] == 0))
201            {
202               next0 = MPLS_INPUT_NEXT_DROP;
203               b0->error = node->errors[MPLS_ERROR_TTL_EXPIRED];
204             }
205           else
206             {
207               next0 = MPLS_INPUT_NEXT_LOOKUP;
208               vnet_feature_arc_start(mm->input_feature_arc_index, sw_if_index0, &next0, b0);
209               vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
210             }
211
212           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
213             {
214               mpls_input_trace_t *tr = vlib_add_trace (vm, node,
215                                                        b0, sizeof (*tr));
216               tr->next_index = next0;
217               tr->label_net_byte_order = *(u32*)h0;
218             }
219
220           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
221                                            to_next, n_left_to_next,
222                                            bi0, next0);
223         }
224
225       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
226     }
227   vlib_node_increment_counter (vm, mpls_input_node.index,
228                                MPLS_ERROR_PKTS_DECAP, from_frame->n_vectors);
229   return from_frame->n_vectors;
230 }
231
232 VLIB_NODE_FN (mpls_input_node) (vlib_main_t * vm,
233             vlib_node_runtime_t * node,
234             vlib_frame_t * from_frame)
235 {
236   return mpls_input_inline (vm, node, from_frame);
237 }
238
239 static char * mpls_error_strings[] = {
240 #define mpls_error(n,s) s,
241 #include "error.def"
242 #undef mpls_error
243 };
244
245 VLIB_REGISTER_NODE (mpls_input_node) = {
246   .name = "mpls-input",
247   /* Takes a vector of packets. */
248   .vector_size = sizeof (u32),
249
250   .runtime_data_bytes = sizeof(mpls_input_runtime_t),
251
252   .n_errors = MPLS_N_ERROR,
253   .error_strings = mpls_error_strings,
254
255   .n_next_nodes = MPLS_INPUT_N_NEXT,
256   .next_nodes = {
257 #define _(s,n) [MPLS_INPUT_NEXT_##s] = n,
258     foreach_mpls_input_next
259 #undef _
260   },
261
262   .format_buffer = format_mpls_unicast_header_net_byte_order,
263   .format_trace = format_mpls_input_trace,
264 };
265
266 #ifndef CLIB_MARCH_VARIANT
267 static void
268 mpls_setup_nodes (vlib_main_t * vm)
269 {
270   pg_node_t * pn;
271
272   pn = pg_get_node (mpls_input_node.index);
273   pn->unformat_edit = unformat_pg_mpls_header;
274
275   ethernet_register_input_type (vm, ETHERNET_TYPE_MPLS,
276                                 mpls_input_node.index);
277 }
278
279 static clib_error_t * mpls_input_init (vlib_main_t * vm)
280 {
281   mpls_setup_nodes (vm);
282
283   return 0;
284 }
285
286 /* *INDENT-OFF* */
287 VLIB_INIT_FUNCTION (mpls_input_init) =
288 {
289   .runs_after = VLIB_INITS("mpls_init"),
290 };
291 /* *INDENT-ON* */
292 #endif /* CLIB_MARCH_VARIANT */