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
|
/* reqids, for libreswan
*
* Copyright (C) 2019 Andrew Cagney
*
* This program 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 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program 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.
*/
#include "reqid.h"
#include "passert.h"
/*
* generate a base reqid for automatic keying
*
* We are actually allocating a group of four contiguous
* numbers: one is used for each SA in an SA bundle.
*
* - must not be in range 0 to IPSEC_MANUAL_REQID_MAX
*
* - is a multiple of 4 (we are actually allocating four requids: see
* requid_ah, reqid_esp, reqid_ipcomp)
*
* - does not duplicate any currently in use (its assumed that pluto
* will crash before the 24-bit integer - one million connections -
* rolls over).
*
* NOTE: comments seems to lie, we use same reqid for the
* ESP inbound and outbound.
*
* XXX: Could just as easily return:
*
* IPSEC_MANUAL_REQID_ROOF + connection.nr * 4
*/
reqid_t gen_reqid(void)
{
/* 0x3fff+1==16384 is the first reqid we will use when not specified manually */
static reqid_t global_reqids = IPSEC_MANUAL_REQID_MAX+1;
global_reqids += 4;
passert(global_reqids != 0); /* 16 000 000 roll over */
passert(global_reqids % 4 == 0); /* allocate 4 at a time */
return global_reqids;
}
reqid_t reqid_ah(reqid_t r)
{
return r;
}
reqid_t reqid_esp(reqid_t r)
{
return r <= IPSEC_MANUAL_REQID_MAX ? r : (r + 1);
}
reqid_t reqid_ipcomp(reqid_t r)
{
return r <= IPSEC_MANUAL_REQID_MAX ? r : (r + 2);
}
|
