VOM: mroutes
[vpp.git] / src / vnet / fib / fib_entry_delegate.h
1 /*
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:
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15
16 #ifndef __FIB_ENTRY_DELEGATE_T__
17 #define __FIB_ENTRY_DELEGATE_T__
18
19 #include <vnet/fib/fib_node.h>
20
21 /**
22  * Delegate types
23  */
24 typedef enum fib_entry_delegate_type_t_ {
25     /**
26      * Forwarding chain types:
27      * for the vast majority of FIB entries only one chain is required - the
28      * one that forwards traffic matching the fib_entry_t's fib_prefix_t. For those
29      * fib_entry_t that are a resolution target for other fib_entry_t's they will also
30      * need the chain to provide forwarding for those children. We store these additional
31      * chains in delegates to save memory in the common case.
32      */
33     FIB_ENTRY_DELEGATE_CHAIN_UNICAST_IP4 = FIB_FORW_CHAIN_TYPE_UNICAST_IP4,
34     FIB_ENTRY_DELEGATE_CHAIN_UNICAST_IP6 = FIB_FORW_CHAIN_TYPE_UNICAST_IP6,
35     FIB_ENTRY_DELEGATE_CHAIN_MPLS_EOS = FIB_FORW_CHAIN_TYPE_MPLS_EOS,
36     FIB_ENTRY_DELEGATE_CHAIN_MPLS_NON_EOS = FIB_FORW_CHAIN_TYPE_MPLS_NON_EOS,
37     FIB_ENTRY_DELEGATE_CHAIN_ETHERNET = FIB_FORW_CHAIN_TYPE_ETHERNET,
38     FIB_ENTRY_DELEGATE_CHAIN_NSH = FIB_FORW_CHAIN_TYPE_NSH,
39     /**
40      * Dependency list of covered entries.
41      * these are more specific entries that are interested in changes
42      * to their respective cover
43      */
44     FIB_ENTRY_DELEGATE_COVERED,
45     /**
46      * BFD session state
47      */
48     FIB_ENTRY_DELEGATE_BFD,
49     /**
50      * Attached import/export functionality
51      */
52     FIB_ENTRY_DELEGATE_ATTACHED_IMPORT,
53     FIB_ENTRY_DELEGATE_ATTACHED_EXPORT,
54 } fib_entry_delegate_type_t;
55
56 #define FOR_EACH_DELEGATE_CHAIN(_entry, _fdt, _fed, _body)    \
57 {                                                             \
58     for (_fdt = FIB_ENTRY_DELEGATE_CHAIN_UNICAST_IP4;         \
59          _fdt <= FIB_ENTRY_DELEGATE_CHAIN_NSH;                \
60          _fdt++)                                              \
61     {                                                         \
62         _fed = fib_entry_delegate_get(_entry, _fdt);          \
63         if (NULL != _fed) {                                   \
64             _body;                                            \
65         }                                                     \
66     }                                                         \
67 }
68 #define FOR_EACH_DELEGATE(_entry, _fdt, _fed, _body)          \
69 {                                                             \
70     for (_fdt = FIB_ENTRY_DELEGATE_CHAIN_UNICAST_IP4;         \
71          _fdt <= FIB_ENTRY_DELEGATE_ATTACHED_EXPORT;          \
72          _fdt++)                                              \
73     {                                                         \
74         _fed = fib_entry_delegate_get(_entry, _fdt);          \
75         if (NULL != _fed) {                                   \
76             _body;                                            \
77         }                                                     \
78     }                                                         \
79 }
80
81 /**
82  * Distillation of the BFD session states into a go/no-go for using
83  * the associated tracked FIB entry
84  */
85 typedef enum fib_bfd_state_t_
86 {
87     FIB_BFD_STATE_UP,
88     FIB_BFD_STATE_DOWN,
89 } fib_bfd_state_t;
90
91 /**
92  * A Delagate is a means to implmenet the Delagation design pattern; the extension of an
93  * objects functionality through the composition of, and delgation to, other objects.
94  * These 'other' objects are delegates. Delagates are thus attached to other FIB objects
95  * to extend their functionality.
96  */
97 typedef struct fib_entry_delegate_t_
98 {
99     /**
100      * The FIB entry object to which the delagate is attached
101      */
102     fib_node_index_t fd_entry_index;
103
104     /**
105      * The delagate type
106      */
107     fib_entry_delegate_type_t fd_type;
108
109     /**
110      * A union of data for the different delegate types
111      * These delegates are stored in a sparse vector on the entry, so they
112      * must all be of the same size. We could use indirection here for all types,
113      * i.e. store an index, that's ok for large delegates, like the attached export
114      * but for the chain delegates it's excessive
115      */
116     union
117     {
118         /**
119          * Valid for the forwarding chain delegates. The LB that is built.
120          */
121         dpo_id_t fd_dpo;
122
123         /**
124          * Valid for the attached import cases. An index of the importer/exporter
125          */
126         fib_node_index_t fd_index;
127
128         /**
129          * For the cover tracking. The node list;
130          */
131         fib_node_list_t fd_list;
132
133         /**
134          * BFD state
135          */
136         fib_bfd_state_t fd_bfd_state;
137     };
138 } fib_entry_delegate_t;
139
140 struct fib_entry_t_;
141
142 extern void fib_entry_delegate_remove(struct fib_entry_t_ *fib_entry,
143                                       fib_entry_delegate_type_t type);
144
145 extern fib_entry_delegate_t *fib_entry_delegate_find_or_add(struct fib_entry_t_ *fib_entry,
146                                                             fib_entry_delegate_type_t fdt);
147 extern fib_entry_delegate_t *fib_entry_delegate_get(const struct fib_entry_t_ *fib_entry,
148                                                     fib_entry_delegate_type_t type);
149
150 extern fib_forward_chain_type_t fib_entry_delegate_type_to_chain_type(
151     fib_entry_delegate_type_t type);
152
153 extern fib_entry_delegate_type_t fib_entry_chain_type_to_delegate_type(
154      fib_forward_chain_type_t type);
155
156 extern u8 *format_fib_entry_deletegate(u8 * s, va_list * args);
157
158 #endif