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.
17 * Given a route of the form;
19 * via <interface> <next-hop>
21 * The prefix is: q.r.s.t./Y
22 * the path is: 'via <interface> <next-hop>
24 * The path is the description of where to send the traffic, and the
25 * the prefix is a description of which traffic to send.
26 * It is the aim of the FIB to resolve the path, i.e. to find the corresponding
27 * adjacency to match the path's description.
30 #ifndef __FIB_PATH_H__
31 #define __FIB_PATH_H__
33 #include <vnet/ip/ip.h>
34 #include <vnet/dpo/load_balance.h>
36 #include <vnet/fib/fib_types.h>
37 #include <vnet/adj/adj_types.h>
40 * Enurmeration of path configuration attributes
42 typedef enum fib_path_cfg_attribute_t_ {
44 * Marker. Add new types after this one.
46 FIB_PATH_CFG_ATTRIBUTE_FIRST = 0,
48 * The path is forced to a drop, whatever the next-hop info says.
49 * something somewhere knows better...
51 FIB_PATH_CFG_ATTRIBUTE_DROP = FIB_PATH_CFG_ATTRIBUTE_FIRST,
53 * The path uses an adj that is exclusive. I.e. it is known only by
54 * the source of the route.
56 FIB_PATH_CFG_ATTRIBUTE_EXCLUSIVE,
58 * Recursion constraint via host
60 FIB_PATH_CFG_ATTRIBUTE_RESOLVE_HOST,
62 * Recursion constraint via attached
64 FIB_PATH_CFG_ATTRIBUTE_RESOLVE_ATTACHED,
66 * The path is attached
68 FIB_PATH_CFG_ATTRIBUTE_ATTACHED,
70 * The path is a for-us path
72 FIB_PATH_CFG_ATTRIBUTE_INTF_RX,
74 * The path is a deag with rpf-id
76 FIB_PATH_CFG_ATTRIBUTE_RPF_ID,
78 * The path is an interface recieve
80 FIB_PATH_CFG_ATTRIBUTE_LOCAL,
82 * The deag path does a source lookup
84 FIB_PATH_CFG_ATTRIBUTE_DEAG_SRC,
86 * Marker. Add new types before this one, then update it.
88 FIB_PATH_CFG_ATTRIBUTE_LAST = FIB_PATH_CFG_ATTRIBUTE_DEAG_SRC,
89 } __attribute__ ((packed)) fib_path_cfg_attribute_t;
92 * The maximum number of path attributes
94 #define FIB_PATH_CFG_ATTRIBUTE_MAX (FIB_PATH_CFG_ATTRIBUTE_LAST + 1)
96 #define FIB_PATH_CFG_ATTRIBUTES { \
97 [FIB_PATH_CFG_ATTRIBUTE_DROP] = "drop", \
98 [FIB_PATH_CFG_ATTRIBUTE_EXCLUSIVE] = "exclusive", \
99 [FIB_PATH_CFG_ATTRIBUTE_RESOLVE_HOST] = "resolve-host", \
100 [FIB_PATH_CFG_ATTRIBUTE_RESOLVE_ATTACHED] = "resolve-attached", \
101 [FIB_PATH_CFG_ATTRIBUTE_LOCAL] = "local", \
102 [FIB_PATH_CFG_ATTRIBUTE_ATTACHED] = "attached", \
103 [FIB_PATH_CFG_ATTRIBUTE_INTF_RX] = "interface-rx", \
104 [FIB_PATH_CFG_ATTRIBUTE_RPF_ID] = "rpf-id", \
105 [FIB_PATH_CFG_ATTRIBUTE_DEAG_SRC] = "deag-src", \
108 #define FOR_EACH_FIB_PATH_CFG_ATTRIBUTE(_item) \
109 for (_item = FIB_PATH_CFG_ATTRIBUTE_FIRST; \
110 _item <= FIB_PATH_CFG_ATTRIBUTE_LAST; \
114 * Path config flags from the attributes
116 typedef enum fib_path_cfg_flags_t_ {
117 FIB_PATH_CFG_FLAG_NONE = 0,
118 FIB_PATH_CFG_FLAG_DROP = (1 << FIB_PATH_CFG_ATTRIBUTE_DROP),
119 FIB_PATH_CFG_FLAG_EXCLUSIVE = (1 << FIB_PATH_CFG_ATTRIBUTE_EXCLUSIVE),
120 FIB_PATH_CFG_FLAG_RESOLVE_HOST = (1 << FIB_PATH_CFG_ATTRIBUTE_RESOLVE_HOST),
121 FIB_PATH_CFG_FLAG_RESOLVE_ATTACHED = (1 << FIB_PATH_CFG_ATTRIBUTE_RESOLVE_ATTACHED),
122 FIB_PATH_CFG_FLAG_LOCAL = (1 << FIB_PATH_CFG_ATTRIBUTE_LOCAL),
123 FIB_PATH_CFG_FLAG_ATTACHED = (1 << FIB_PATH_CFG_ATTRIBUTE_ATTACHED),
124 FIB_PATH_CFG_FLAG_INTF_RX = (1 << FIB_PATH_CFG_ATTRIBUTE_INTF_RX),
125 FIB_PATH_CFG_FLAG_RPF_ID = (1 << FIB_PATH_CFG_ATTRIBUTE_RPF_ID),
126 FIB_PATH_CFG_FLAG_DEAG_SRC = (1 << FIB_PATH_CFG_ATTRIBUTE_DEAG_SRC),
127 } __attribute__ ((packed)) fib_path_cfg_flags_t;
130 extern u8 *fib_path_format(fib_node_index_t pi, u8 *s);
131 extern u8 *fib_path_adj_format(fib_node_index_t pi,
135 extern u8 * format_fib_path(u8 * s, va_list * args);
137 extern fib_node_index_t fib_path_create(fib_node_index_t pl_index,
138 const fib_route_path_t *path);
139 extern fib_node_index_t fib_path_create_special(fib_node_index_t pl_index,
140 dpo_proto_t nh_proto,
141 fib_path_cfg_flags_t flags,
142 const dpo_id_t *dpo);
144 extern int fib_path_cmp(fib_node_index_t path_index1,
145 fib_node_index_t path_index2);
146 extern int fib_path_cmp_for_sort(void * a1, void * a2);
147 extern int fib_path_cmp_w_route_path(fib_node_index_t path_index,
148 const fib_route_path_t *rpath);
149 extern fib_node_index_t fib_path_copy(fib_node_index_t path_index,
150 fib_node_index_t path_list_index);
151 extern int fib_path_resolve(fib_node_index_t path_index);
152 extern int fib_path_is_resolved(fib_node_index_t path_index);
153 extern int fib_path_is_recursive_constrained(fib_node_index_t path_index);
154 extern int fib_path_is_exclusive(fib_node_index_t path_index);
155 extern int fib_path_is_deag(fib_node_index_t path_index);
156 extern int fib_path_is_looped(fib_node_index_t path_index);
157 extern dpo_proto_t fib_path_get_proto(fib_node_index_t path_index);
158 extern void fib_path_destroy(fib_node_index_t path_index);
159 extern uword fib_path_hash(fib_node_index_t path_index);
160 extern load_balance_path_t * fib_path_append_nh_for_multipath_hash(
161 fib_node_index_t path_index,
162 fib_forward_chain_type_t fct,
163 load_balance_path_t *hash_key);
164 extern void fib_path_stack_mpls_disp(fib_node_index_t path_index,
165 dpo_proto_t payload_proto,
167 extern void fib_path_contribute_forwarding(fib_node_index_t path_index,
168 fib_forward_chain_type_t type,
170 extern void fib_path_contribute_urpf(fib_node_index_t path_index,
172 extern adj_index_t fib_path_get_adj(fib_node_index_t path_index);
173 extern int fib_path_recursive_loop_detect(fib_node_index_t path_index,
174 fib_node_index_t **entry_indicies);
175 extern u32 fib_path_get_resolving_interface(fib_node_index_t fib_entry_index);
176 extern u16 fib_path_get_weight(fib_node_index_t path_index);
177 extern u16 fib_path_get_preference(fib_node_index_t path_index);
179 extern void fib_path_module_init(void);
180 extern fib_path_list_walk_rc_t fib_path_encode(fib_node_index_t path_list_index,
181 fib_node_index_t path_index,