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Vector Packet Processing
fib_entry_src_interface.c
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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 #include "fib_entry.h"
17 #include "fib_entry_src.h"
18 #include "fib_path_list.h"
19 #include "fib_internal.h"
20 #include "fib_table.h"
21 #include "fib_entry_cover.h"
22 #include "fib_attached_export.h"
23 
24 /**
25  * Source initialisation Function
26  */
27 static void
29 {
30  src->interface.fesi_cover = FIB_NODE_INDEX_INVALID;
31  src->interface.fesi_sibling = FIB_NODE_INDEX_INVALID;
32 }
33 
34 static void
36  const fib_entry_t *entry,
37  fib_path_list_flags_t pl_flags,
38  const fib_route_path_t *paths)
39 {
40  ip_adjacency_t *adj;
41 
42  src->fes_pl = fib_path_list_create(pl_flags, paths);
43 
44  /*
45  * this is a hack to get the entry's prefix into the glean adjacnecy
46  * so that it is available for fast retreival in the switch path.
47  */
49  {
51  src->fes_pl,
53 
55  {
56  /*
57  * the connected prefix will link to a glean on a non-p2p
58  * interface.
59  */
60  adj->sub_type.glean.receive_addr = entry->fe_prefix.fp_addr;
61  }
62  }
63 }
64 
65 /*
66  * Source activate.
67  * Called when the source is teh new longer best source on the entry
68  */
69 static int
71  const fib_entry_t *fib_entry)
72 {
73  fib_entry_t *cover;
74 
76  {
77  /*
78  * Track the covering attached/connected cover. This is so that
79  * during an attached export of the cover, this local prefix is
80  * also exported
81  */
82  src->interface.fesi_cover =
84  &fib_entry->fe_prefix);
85 
86  ASSERT(FIB_NODE_INDEX_INVALID != src->interface.fesi_cover);
87 
88  cover = fib_entry_get(src->interface.fesi_cover);
89 
90  src->interface.fesi_sibling =
91  fib_entry_cover_track(cover, fib_entry_get_index(fib_entry));
92  }
93 
94  return (!0);
95 }
96 
97 
98 /*
99  * Source Deactivate.
100  * Called when the source is no longer best source on the entry
101  */
102 static void
104  const fib_entry_t *fib_entry)
105 {
106  fib_entry_t *cover;
107 
108  /*
109  * remove the depednecy on the covering entry
110  */
111  if (FIB_NODE_INDEX_INVALID != src->interface.fesi_cover)
112  {
113  cover = fib_entry_get(src->interface.fesi_cover);
114 
115  fib_entry_cover_untrack(cover, src->interface.fesi_sibling);
116 
117  src->interface.fesi_cover = FIB_NODE_INDEX_INVALID;
118  }
119 }
120 
123  const fib_entry_t *fib_entry)
124 {
126  .install = !0,
127  .bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
128  };
129 
130  if (FIB_NODE_INDEX_INVALID == src->interface.fesi_cover)
131  {
132  /*
133  * not tracking the cover. surprised we got poked?
134  */
135  return (res);
136  }
137 
138  /*
139  * this function is called when this entry's cover has a more specific
140  * entry inserted benaeth it. That does not necessarily mean that this
141  * entry is covered by the new prefix. check that
142  */
143  if (src->rr.fesr_cover != fib_table_get_less_specific(fib_entry->fe_fib_index,
144  &fib_entry->fe_prefix))
145  {
146  fib_entry_src_interface_deactivate(src, fib_entry);
147  fib_entry_src_interface_activate(src, fib_entry);
148  }
149  return (res);
150 }
151 
152 static void
154  const fib_entry_t *fib_entry)
155 {
156  /*
157  * The interface source now rules! poke our cover to get exported
158  */
159  fib_entry_t *cover;
160 
161  if (FIB_NODE_INDEX_INVALID != src->interface.fesi_cover)
162  {
163  cover = fib_entry_get(src->interface.fesi_cover);
164 
166  fib_entry_get_index(fib_entry));
167  }
168 }
169 
170 static u8*
172  u8* s)
173 {
174  return (format(s, "cover:%d", src->interface.fesi_cover));
175 }
176 
177 const static fib_entry_src_vft_t interface_src_vft = {
179  .fesv_path_swap = fib_entry_src_interface_path_swap,
180  .fesv_activate = fib_entry_src_interface_activate,
181  .fesv_deactivate = fib_entry_src_interface_deactivate,
182  .fesv_format = fib_entry_src_interface_format,
183  .fesv_installed = fib_entry_src_interface_installed,
184  .fesv_cover_change = fib_entry_src_interface_cover_change,
185  /*
186  * not concerned about updates to the cover. the cover will
187  * decide to export or not
188  */
189 };
190 
191 void
193 {
194  fib_entry_src_register(FIB_SOURCE_INTERFACE, &interface_src_vft);
195 }
fib_entry_src_init_t fesv_init
An entry in a FIB table.
Definition: fib_entry.h:373
A representation of a path as described by a route producer.
Definition: fib_types.h:308
void fib_entry_cover_untrack(fib_entry_t *cover, u32 tracked_index)
adj_index_t fib_path_list_get_adj(fib_node_index_t path_list_index, fib_forward_chain_type_t type)
Virtual function table each FIB entry source will register.
IP unicast adjacency.
Definition: lookup.h:193
Information related to the source of a FIB entry.
Definition: fib_entry.h:282
static fib_entry_src_cover_res_t fib_entry_src_interface_cover_change(fib_entry_src_t *src, const fib_entry_t *fib_entry)
Result from a cover update/change.
Definition: fib_entry_src.h:87
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:418
union ip_adjacency_t_::@138 sub_type
u32 fe_fib_index
The index of the FIB table this entry is in.
Definition: fib_entry.h:386
void fib_attached_export_covered_added(fib_entry_t *cover, fib_node_index_t covered)
u32 fib_entry_cover_track(fib_entry_t *cover, fib_node_index_t covered)
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:128
struct fib_entry_src_t_::@88::@92 interface
fib_node_index_t fib_entry_get_index(const fib_entry_t *fib_entry)
Definition: fib_entry.c:56
This packet matches an "interface route" and packets need to be passed to ARP to find rewrite string ...
Definition: lookup.h:78
u16 install
Definition: fib_entry_src.h:88
Definition: fib_entry.h:232
fib_node_index_t fib_path_list_create(fib_path_list_flags_t flags, const fib_route_path_t *rpaths)
ip46_address_t fp_addr
The address type is not deriveable from the fp_addr member.
Definition: fib_types.h:183
struct fib_entry_src_t_::@88::@90 rr
static int fib_entry_src_interface_activate(fib_entry_src_t *src, const fib_entry_t *fib_entry)
fib_entry_t * fib_entry_get(fib_node_index_t index)
Definition: fib_entry.c:44
fib_entry_flag_t fes_entry_flags
Flags the source contributes to the entry.
Definition: fib_entry.h:311
#define ASSERT(truth)
void fib_entry_src_register(fib_source_t source, const fib_entry_src_vft_t *vft)
Definition: fib_entry_src.c:38
Route added as a result of interface configuration.
Definition: fib_entry.h:50
fib_node_index_t fes_pl
The path-list created by the source.
Definition: fib_entry.h:291
static void fib_entry_src_interface_init(fib_entry_src_t *src)
Source initialisation Function.
#define FIB_NODE_INDEX_INVALID
Definition: fib_types.h:29
unsigned char u8
Definition: types.h:56
ip_lookup_next_t lookup_next_index
Definition: lookup.h:204
static void fib_entry_src_interface_installed(fib_entry_src_t *src, const fib_entry_t *fib_entry)
static void fib_entry_src_interface_deactivate(fib_entry_src_t *src, const fib_entry_t *fib_entry)
enum fib_path_list_flags_t_ fib_path_list_flags_t
static void fib_entry_src_interface_path_swap(fib_entry_src_t *src, const fib_entry_t *entry, fib_path_list_flags_t pl_flags, const fib_route_path_t *paths)
fib_forward_chain_type_t fib_entry_get_default_chain_type(const fib_entry_t *fib_entry)
Definition: fib_entry.c:68
const fib_prefix_t fe_prefix
The prefix of the route.
Definition: fib_entry.h:382
fib_node_index_t fib_table_get_less_specific(u32 fib_index, const fib_prefix_t *prefix)
Get the less specific (covering) prefix.
Definition: fib_table.c:131
struct ip_adjacency_t_::@138::@141 glean
IP_LOOKUP_NEXT_GLEAN.
static u8 * fib_entry_src_interface_format(fib_entry_src_t *src, u8 *s)
void fib_entry_src_interface_register(void)