1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/* BGP ROUTE-REFRESH and ORF handling
* Copyright (C) Chris Hall (GMCH), Highwayman
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2, or (at your
* option) any later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include "lib/zassert.h"
#include "lib/memory.h"
#include "lib/vector.h"
#include "bgpd/bgp_route_refresh.h"
/*==============================================================================
* A bgp_route_refresh structure encapsulates the contents of a BGP
* ROUTE-REFRESH message, with or without ORF part.
*
* For incoming messages, expect a bgp_route_refresh structure to be the
* contents of a single ROUTE-REFRESH message.
*
* For outgoing messages, a bgp_route_refresh structure may contain a large
* number of ORF entries, and those are carved up into as many ROUTE-REFRESH
* messages as required.
*/
/*==============================================================================
* Create/Destroy bgp_route_refresh
*/
/*------------------------------------------------------------------------------
* Allocate and initialise new bgp_route_refresh
*
* Constructs complete simple ROUTE-REFRESH -- ORF stuff can then be added.
*
* Can specify an expected number of ORF entries (need not be actual number).
*/
extern bgp_route_refresh
bgp_route_refresh_new(iAFI_t afi, iSAFI_t safi, unsigned count)
{
bgp_route_refresh rr ;
rr = XCALLOC(MTYPE_BGP_ROUTE_REFRESH, sizeof(struct bgp_route_refresh)) ;
rr->afi = afi ;
rr->safi = safi ;
vector_init_new(&rr->entries, count) ;
/* rest of bgp_route_refresh zeroised -- not relevant when vector empty */
return rr ;
} ;
/*------------------------------------------------------------------------------
* Free bgp_route_refresh
*/
extern void
bgp_route_refresh_free(bgp_route_refresh rr)
{
bgp_orf_entry entry ;
while((entry = vector_ream_keep(&rr->entries)) != NULL)
XFREE(MTYPE_BGP_ORF_ENTRY, entry) ;
XFREE(MTYPE_BGP_ROUTE_REFRESH, rr) ;
} ;
/*------------------------------------------------------------------------------
* Set the defer flag as required
*/
extern void
bgp_route_refresh_set_orf_defer(bgp_route_refresh rr, bool defer)
{
rr->defer = (defer != 0) ;
} ;
/*------------------------------------------------------------------------------
* Allocate new bgp_orf_entry -- for known or unknown type.
*
* Is for known type if unknown_size == 0 !
*
* Sets orf_type and unknown elements of the entry.
*
* NB: it is a FATAL error to set an unknown ORF type unless is explicitly
* unknown ! (In this context "pre-RFC" types are unknown.)
*
* Zeroises rest of structure -- in particular remove_all == false !
*
* Pushes entry onto the bgp_route_refresh list.
*/
static bgp_orf_entry
bgp_orf_entry_new(bgp_route_refresh rr, uint8_t orf_type, bgp_form_t form,
size_t unknown_size)
{
bgp_orf_entry orfe ;
size_t e_size ;
if (unknown_size == 0)
{
if (orf_type != BGP_ORF_T_PREFIX)
zabort("unknown ORF type") ;
e_size = 0 ;
}
else
{
if (unknown_size < bgp_orf_unknown_min_l)
e_size = 0 ;
else
e_size = unknown_size - bgp_orf_unknown_min_l ;
} ;
orfe = XCALLOC(MTYPE_BGP_ORF_ENTRY, sizeof(struct bgp_orf_entry) + e_size) ;
orfe->orf_type = orf_type ;
orfe->form = form ;
orfe->unknown = (unknown_size != 0) ;
vector_push_item(&rr->entries, orfe) ;
return orfe ;
} ;
/*==============================================================================
* Creating new ORF entries.
*/
/*------------------------------------------------------------------------------
* Add an entry for known type of ORF.
*
* Sets the common ORF entry part.
*
* Returns address of the ORF type specific structure, to be filled in.
*
* The orf_type presented must be a known BGP_ORF_T_xxx value, EXCLUDING any
* "pre-RFC" types. (Any use of pre-RFC values is looked after at the message
* level).
*
* NB: it is a FATAL error to set an unknown ORF type
*/
extern bgp_orf_entry
bgp_orf_add(bgp_route_refresh rr, uint8_t orf_type, bgp_form_t form,
bool remove, bool deny)
{
bgp_orf_entry orfe = bgp_orf_entry_new(rr, orf_type, form, 0) ;
orfe->remove = remove ;
orfe->deny = deny ;
return orfe ;
} ;
/*------------------------------------------------------------------------------
* Add a remove_all entry.
*
* The orf_type presented must be a known BGP_ORF_T_xxx value, EXCLUDING any
* "pre-RFC" types. (Any use of pre-RFC values is looked after at the message
* level).
*
* NB: it is a FATAL error to set an unknown ORF type
*/
extern void
bgp_orf_add_remove_all(bgp_route_refresh rr, uint8_t orf_type, bgp_form_t form)
{
bgp_orf_entry orfe = bgp_orf_entry_new(rr, orf_type, form, 0) ;
orfe->remove_all = 1 ;
} ;
/*------------------------------------------------------------------------------
* Add an entry for an unknown type of ORF -- copy the entry verbatim.
*
* Provided so that can capture entire contents of incoming message.
*/
extern void
bgp_orf_add_unknown(bgp_route_refresh rr, uint8_t orf_type, bgp_size_t length,
const void* entries)
{
bgp_orf_entry orfe = bgp_orf_entry_new(rr, orf_type, bgp_form_none,
(length > 0) ? length : 1) ;
if (length != 0)
memcpy(&orfe->body.orf_unknown.data, entries, length) ;
} ;
|
