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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,
38  dpo_proto_t proto,
39  const dpo_id_t *dpo)
40 {
42  proto,
44  dpo);
45 }
46 
47 static void
49 {
51 }
52 
53 static void
55  const fib_entry_t *entry,
56  fib_path_list_flags_t pl_flags,
57  const fib_route_path_t *paths)
58 {
59  ip_adjacency_t *adj;
60 
61  src->fes_pl = fib_path_list_create(pl_flags, paths);
62 
63  /*
64  * this is a hack to get the entry's prefix into the glean adjacnecy
65  * so that it is available for fast retreival in the switch path.
66  */
68  {
70  src->fes_pl,
72 
74  {
75  /*
76  * the connected prefix will link to a glean on a non-p2p
77  * interface.
78  */
79  adj->sub_type.glean.receive_addr = entry->fe_prefix.fp_addr;
80  }
81  }
82 }
83 
84 /*
85  * Source activate.
86  * Called when the source is teh new longer best source on the entry
87  */
88 static int
90  const fib_entry_t *fib_entry)
91 {
92  fib_entry_t *cover;
93 
95  {
96  /*
97  * Track the covering attached/connected cover. This is so that
98  * during an attached export of the cover, this local prefix is
99  * also exported
100  */
101  src->interface.fesi_cover =
103  &fib_entry->fe_prefix);
104 
105  ASSERT(FIB_NODE_INDEX_INVALID != src->interface.fesi_cover);
106 
107  cover = fib_entry_get(src->interface.fesi_cover);
108 
109  src->interface.fesi_sibling =
110  fib_entry_cover_track(cover, fib_entry_get_index(fib_entry));
111  }
112 
113  return (!0);
114 }
115 
116 
117 /*
118  * Source Deactivate.
119  * Called when the source is no longer best source on the entry
120  */
121 static void
123  const fib_entry_t *fib_entry)
124 {
125  fib_entry_t *cover;
126 
127  /*
128  * remove the depednecy on the covering entry
129  */
130  if (FIB_NODE_INDEX_INVALID != src->interface.fesi_cover)
131  {
132  cover = fib_entry_get(src->interface.fesi_cover);
133 
134  fib_entry_cover_untrack(cover, src->interface.fesi_sibling);
135 
136  src->interface.fesi_cover = FIB_NODE_INDEX_INVALID;
137  }
138 }
139 
142  const fib_entry_t *fib_entry)
143 {
145  .install = !0,
146  .bw_reason = FIB_NODE_BW_REASON_FLAG_NONE,
147  };
148 
149  if (FIB_NODE_INDEX_INVALID == src->interface.fesi_cover)
150  {
151  /*
152  * not tracking the cover. surprised we got poked?
153  */
154  return (res);
155  }
156 
157  /*
158  * this function is called when this entry's cover has a more specific
159  * entry inserted benaeth it. That does not necessarily mean that this
160  * entry is covered by the new prefix. check that
161  */
162  if (src->rr.fesr_cover != fib_table_get_less_specific(fib_entry->fe_fib_index,
163  &fib_entry->fe_prefix))
164  {
165  fib_entry_src_interface_deactivate(src, fib_entry);
166  fib_entry_src_interface_activate(src, fib_entry);
167  }
168  return (res);
169 }
170 
171 static void
173  const fib_entry_t *fib_entry)
174 {
175  /*
176  * The interface source now rules! poke our cover to get exported
177  */
178  fib_entry_t *cover;
179 
180  if (FIB_NODE_INDEX_INVALID != src->interface.fesi_cover)
181  {
182  cover = fib_entry_get(src->interface.fesi_cover);
183 
185  fib_entry_get_index(fib_entry));
186  }
187 }
188 
189 static u8*
191  u8* s)
192 {
193  return (format(s, "cover:%d", src->interface.fesi_cover));
194 }
195 
196 const static fib_entry_src_vft_t interface_src_vft = {
198  .fesv_add = fib_entry_src_interface_add,
199  .fesv_remove = fib_entry_src_interface_remove,
200  .fesv_path_swap = fib_entry_src_interface_path_swap,
201  .fesv_activate = fib_entry_src_interface_activate,
202  .fesv_deactivate = fib_entry_src_interface_deactivate,
203  .fesv_format = fib_entry_src_interface_format,
204  .fesv_installed = fib_entry_src_interface_installed,
205  .fesv_cover_change = fib_entry_src_interface_cover_change,
206  /*
207  * not concerned about updates to the cover. the cover will
208  * decide to export or not
209  */
210 };
211 
212 void
214 {
215  fib_entry_src_register(FIB_SOURCE_INTERFACE, &interface_src_vft);
216 }
fib_entry_src_init_t fesv_init
An entry in a FIB table.
Definition: fib_entry.h:375
static void fib_entry_src_interface_remove(fib_entry_src_t *src)
A representation of a path as described by a route producer.
Definition: fib_types.h:336
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: adj.h:174
Information related to the source of a FIB entry.
Definition: fib_entry.h:284
fib_node_index_t fib_path_list_create_special(dpo_proto_t nh_proto, fib_path_list_flags_t flags, const dpo_id_t *dpo)
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:419
u32 fe_fib_index
The index of the FIB table this entry is in.
Definition: fib_entry.h:388
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:365
fib_node_index_t fib_entry_get_index(const fib_entry_t *fib_entry)
Definition: fib_entry.c:56
struct ip_adjacency_t_::@38::@41 glean
IP_LOOKUP_NEXT_GLEAN.
enum dpo_proto_t_ dpo_proto_t
Data path protocol.
struct fib_entry_src_t_::@103::@105 rr
u16 install
Definition: fib_entry_src.h:88
The identity of a DPO is a combination of its type and its instance number/index of objects of that t...
Definition: dpo.h:150
Definition: fib_entry.h:233
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
This packet matches an "interface route" and packets need to be passed to ARP to find rewrite string ...
Definition: adj.h:68
union ip_adjacency_t_::@38 sub_type
struct fib_entry_src_t_::@103::@107 interface
static int fib_entry_src_interface_activate(fib_entry_src_t *src, const fib_entry_t *fib_entry)
fib_path_list_flags_t fib_entry_src_flags_2_path_list_flags(fib_entry_flag_t eflags)
fib_entry_t * fib_entry_get(fib_node_index_t index)
Definition: fib_entry.c:44
enum fib_entry_flag_t_ fib_entry_flag_t
fib_entry_flag_t fes_entry_flags
Flags the source contributes to the entry.
Definition: fib_entry.h:313
#define ASSERT(truth)
void fib_entry_src_register(fib_source_t source, const fib_entry_src_vft_t *vft)
Definition: fib_entry_src.c:33
static void fib_entry_src_interface_add(fib_entry_src_t *src, const fib_entry_t *entry, fib_entry_flag_t flags, dpo_proto_t proto, const dpo_id_t *dpo)
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:293
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
Next hop after ip4-lookup.
Definition: adj.h:189
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
u32 flags
Definition: vhost-user.h:77
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:74
const fib_prefix_t fe_prefix
The prefix of the route.
Definition: fib_entry.h:384
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
static u8 * fib_entry_src_interface_format(fib_entry_src_t *src, u8 *s)
void fib_entry_src_interface_register(void)