2 * Copyright (c) 2016 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 #include <vnet/mpls/mpls.h>
17 #include <vnet/dpo/mpls_label_dpo.h>
18 #include <vnet/dpo/load_balance.h>
19 #include <vnet/dpo/drop_dpo.h>
21 #include <vnet/fib/fib_path_ext.h>
22 #include <vnet/fib/fib_entry_src.h>
23 #include <vnet/fib/fib_path.h>
24 #include <vnet/fib/fib_path_list.h>
25 #include <vnet/fib/fib_internal.h>
27 const char *fib_path_ext_adj_flags_names[] = FIB_PATH_EXT_ADJ_ATTR_NAMES;
28 const char *fib_path_ext_mpls_flags_names[] = FIB_PATH_EXT_MPLS_ATTR_NAMES;
31 format_fib_path_ext (u8 * s, va_list * args)
33 fib_path_ext_t *path_ext;
36 path_ext = va_arg (*args, fib_path_ext_t *);
38 s = format(s, "path:%d ", path_ext->fpe_path_index);
40 switch (path_ext->fpe_type)
42 case FIB_PATH_EXT_MPLS: {
43 fib_path_ext_mpls_attr_t attr;
45 if (path_ext->fpe_mpls_flags)
47 s = format(s, "mpls-flags:[");
49 FOR_EACH_PATH_EXT_MPLS_ATTR(attr)
51 if ((1<<attr) & path_ext->fpe_mpls_flags) {
52 s = format(s, "%s", fib_path_ext_mpls_flags_names[attr]);
57 s = format(s, " labels:[");
58 for (ii = 0; ii < vec_len(path_ext->fpe_path.frp_label_stack); ii++)
61 format_fib_mpls_label,
62 &path_ext->fpe_path.frp_label_stack[ii]);
67 case FIB_PATH_EXT_ADJ: {
68 fib_path_ext_adj_attr_t attr;
70 if (path_ext->fpe_adj_flags)
72 s = format(s, "adj-flags:[");
73 FOR_EACH_PATH_EXT_ADJ_ATTR(attr)
75 if ((1<<attr) & path_ext->fpe_adj_flags)
77 s = format(s, "%s", fib_path_ext_adj_flags_names[attr]);
89 fib_path_ext_cmp (fib_path_ext_t *path_ext,
90 const fib_route_path_t *rpath)
92 return (fib_route_path_cmp(&path_ext->fpe_path, rpath));
95 static fib_path_list_walk_rc_t
96 fib_path_ext_match (fib_node_index_t pl_index,
97 fib_node_index_t path_index,
100 fib_path_ext_t *path_ext = ctx;
102 if (!fib_path_cmp_w_route_path(path_index,
103 &path_ext->fpe_path))
105 path_ext->fpe_path_index = path_index;
106 return (FIB_PATH_LIST_WALK_STOP);
108 return (FIB_PATH_LIST_WALK_CONTINUE);
112 fib_path_ext_resolve (fib_path_ext_t *path_ext,
113 fib_node_index_t path_list_index)
116 * Find the path on the path list that this is an extension for
118 path_ext->fpe_path_index = FIB_NODE_INDEX_INVALID;
119 fib_path_list_walk(path_list_index,
125 fib_path_ext_init (fib_path_ext_t *path_ext,
126 fib_node_index_t path_list_index,
127 fib_path_ext_type_t ext_type,
128 const fib_route_path_t *rpath)
130 path_ext->fpe_path = *rpath;
131 path_ext->fpe_path_index = FIB_NODE_INDEX_INVALID;
132 path_ext->fpe_adj_flags = FIB_PATH_EXT_ADJ_FLAG_NONE;
133 path_ext->fpe_type = ext_type;
135 fib_path_ext_resolve(path_ext, path_list_index);
139 * @brief Return true if the label stack is implicit null
140 * imp-null and pop equate to the same this as this level -
141 * the label is coming off.
144 fib_path_ext_is_imp_null (fib_path_ext_t *path_ext)
146 return ((1 == vec_len(path_ext->fpe_label_stack)) &&
147 ((MPLS_IETF_IMPLICIT_NULL_LABEL == path_ext->fpe_label_stack[0].fml_value) ||
148 (MPLS_LABEL_POP == path_ext->fpe_label_stack[0].fml_value)));
151 mpls_label_dpo_flags_t
152 fib_path_ext_mpls_flags_to_mpls_label (fib_path_ext_mpls_flags_t fpe_flags)
154 mpls_label_dpo_flags_t ml_flags = MPLS_LABEL_DPO_FLAG_NONE;
156 if (fpe_flags &FIB_PATH_EXT_MPLS_FLAG_NO_IP_TTL_DECR)
158 ml_flags |= MPLS_LABEL_DPO_FLAG_NO_IP_TTL_DECR;
164 load_balance_path_t *
165 fib_path_ext_stack (fib_path_ext_t *path_ext,
166 fib_forward_chain_type_t child_fct,
167 fib_forward_chain_type_t imp_null_fct,
168 load_balance_path_t *nhs)
170 fib_forward_chain_type_t parent_fct;
171 load_balance_path_t *nh;
173 if (!fib_path_is_resolved(path_ext->fpe_path_index))
177 * Since we are stacking this path-extension, it must have a valid out
178 * label. From the chain type request by the child, determine what
179 * chain type we will request from the parent.
183 case FIB_FORW_CHAIN_TYPE_MPLS_EOS:
186 * The EOS chain is a tricky since, when the path has an imp NULL one cannot know
187 * the adjacency to link to without knowing what the packets payload protocol
188 * will be once the label is popped.
190 if (fib_path_ext_is_imp_null(path_ext))
192 parent_fct = imp_null_fct;
197 * we have a label to stack. packets will thus be labelled when
198 * they encounter the child, ergo, non-eos.
200 parent_fct = FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS;
204 case FIB_FORW_CHAIN_TYPE_UNICAST_IP4:
205 case FIB_FORW_CHAIN_TYPE_UNICAST_IP6:
206 if (fib_path_ext_is_imp_null(path_ext))
209 * implicit-null label for the eos or IP chain, need to pick up
212 parent_fct = child_fct;
217 * we have a label to stack. packets will thus be labelled when
218 * they encounter the child, ergo, non-eos.
220 parent_fct = FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS;
223 case FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS:
224 parent_fct = child_fct;
226 case FIB_FORW_CHAIN_TYPE_ETHERNET:
227 parent_fct = FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS;
234 dpo_id_t via_dpo = DPO_INVALID;
237 * The next object in the graph after the imposition of the label
238 * will be the DPO contributed by the path through which the packets
239 * are to be sent. We stack the MPLS Label DPO on this path DPO
241 fib_path_contribute_forwarding(path_ext->fpe_path_index,
245 if (dpo_is_drop(&via_dpo) ||
246 load_balance_is_drop(&via_dpo))
249 * don't stack a path extension on a drop. doing so will create
250 * a LB bucket entry on drop, and we will lose a percentage of traffic.
255 vec_add2(nhs, nh, 1);
256 nh->path_weight = fib_path_get_weight(path_ext->fpe_path_index);
257 nh->path_index = path_ext->fpe_path_index;
258 dpo_copy(&nh->path_dpo, &via_dpo);
261 * The label is stackable for this chain type
262 * construct the mpls header that will be imposed in the data-path
264 if (!fib_path_ext_is_imp_null(path_ext))
267 * we use the parent protocol for the label so that
268 * we pickup the correct MPLS imposition nodes to do
271 dpo_id_t parent = DPO_INVALID;
272 dpo_proto_t chain_proto;
275 eos = (child_fct == FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS ?
278 chain_proto = fib_forw_chain_type_to_dpo_proto(child_fct);
280 dpo_copy(&parent, &nh->path_dpo);
281 mpls_label_dpo_create(path_ext->fpe_label_stack,
284 fib_path_ext_mpls_flags_to_mpls_label(
285 path_ext->fpe_mpls_flags),
291 else if (child_fct == FIB_FORW_CHAIN_TYPE_MPLS_EOS)
294 * MPLS EOS packets using an imp-null. Insert the disposition.
296 fib_path_stack_mpls_disp(nh->path_index,
297 fib_forw_chain_type_to_dpo_proto(parent_fct),
298 path_ext->fpe_label_stack[0].fml_mode,
308 fib_path_ext_list_find (const fib_path_ext_list_t *list,
309 fib_path_ext_type_t ext_type,
310 const fib_route_path_t *rpath)
312 fib_path_ext_t *path_ext;
314 vec_foreach(path_ext, list->fpel_exts)
316 if ((path_ext->fpe_type == ext_type) &&
317 !fib_path_ext_cmp(path_ext, rpath) )
326 fib_path_ext_list_find_by_path_index (const fib_path_ext_list_t *list,
327 fib_node_index_t path_index)
329 fib_path_ext_t *path_ext;
333 vec_foreach(path_ext, list->fpel_exts)
335 if (path_ext->fpe_path_index == path_index)
346 fib_path_ext_list_push_back (fib_path_ext_list_t *list,
347 fib_node_index_t path_list_index,
348 fib_path_ext_type_t ext_type,
349 const fib_route_path_t *rpath)
351 fib_path_ext_t *path_ext;
353 path_ext = fib_path_ext_list_find(list, ext_type, rpath);
355 if (NULL == path_ext)
357 vec_add2(list->fpel_exts, path_ext, 1);
358 fib_path_ext_init(path_ext, path_list_index, ext_type, rpath);
365 * insert, sorted, a path extension to the entry's list.
366 * It's not strictly necessary to sort the path extensions, since each
367 * extension has the path index to which it resolves. However, by being
368 * sorted the load-balance produced has a deterministic order, not an order
369 * based on the sequence of extension additions. this is a considerable benefit.
372 fib_path_ext_list_insert (fib_path_ext_list_t *list,
373 fib_node_index_t path_list_index,
374 fib_path_ext_type_t ext_type,
375 const fib_route_path_t *rpath)
377 fib_path_ext_t new_path_ext, *path_ext;
380 if (0 == fib_path_ext_list_length(list))
382 return (fib_path_ext_list_push_back(list, path_list_index,
386 fib_path_ext_init(&new_path_ext, path_list_index, ext_type, rpath);
388 vec_foreach(path_ext, list->fpel_exts)
390 int res = fib_path_ext_cmp(path_ext, rpath);
395 * don't add duplicate extensions. modify instead
397 vec_free(path_ext->fpe_label_stack);
398 *path_ext = new_path_ext;
410 vec_insert_elts(list->fpel_exts, &new_path_ext, 1, i);
412 return (&(list->fpel_exts[i]));
416 fib_path_ext_list_resolve (fib_path_ext_list_t *list,
417 fib_node_index_t path_list_index)
419 fib_path_ext_t *path_ext;
421 vec_foreach(path_ext, list->fpel_exts)
423 fib_path_ext_resolve(path_ext, path_list_index);
428 fib_path_ext_list_remove (fib_path_ext_list_t *list,
429 fib_path_ext_type_t ext_type,
430 const fib_route_path_t *rpath)
432 fib_path_ext_t *path_ext;
434 path_ext = fib_path_ext_list_find(list, ext_type, rpath);
436 if (NULL != path_ext)
439 * delete the element moving the remaining elements down 1 position.
440 * this preserves the sorted order.
442 vec_free(path_ext->fpe_label_stack);
443 vec_delete(list->fpel_exts, 1, (path_ext - list->fpel_exts));
448 fib_path_ext_list_flush (fib_path_ext_list_t *list)
450 fib_path_ext_t *path_ext;
452 vec_foreach(path_ext, list->fpel_exts)
454 vec_free(path_ext->fpe_label_stack);
456 vec_free(list->fpel_exts);
457 list->fpel_exts = NULL;
461 format_fib_path_ext_list (u8 * s, va_list * args)
463 fib_path_ext_list_t *list;
464 fib_path_ext_t *path_ext;
466 list = va_arg (*args, fib_path_ext_list_t *);
468 if (fib_path_ext_list_length(list))
470 s = format(s, " Extensions:");
471 vec_foreach(path_ext, list->fpel_exts)
473 s = format(s, "\n %U", format_fib_path_ext, path_ext);
481 fib_path_ext_list_length (const fib_path_ext_list_t *list)
483 return (vec_len(list->fpel_exts));