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
|
/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Protocol Control Information of FRCT
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#include <ouroboros/frct_pci.h>
#include <ouroboros/hash.h>
#include <ouroboros/errno.h>
#include <assert.h>
#include <string.h>
#define TYPE_SIZE 1
#define SEQNO_SIZE 8
#define FLAGS_SIZE 1
#define CONF_FLAGS_SIZE sizeof(((struct frct_pci *) NULL)->conf_flags)
#define BASE_SIZE TYPE_SIZE + FLAGS_SIZE + SEQNO_SIZE
#define CONFIG_SIZE CONF_FLAGS_SIZE
static size_t get_head_len(struct frct_pci * pci)
{
size_t len = BASE_SIZE;
if (pci->type & PDU_TYPE_CONFIG)
len += CONFIG_SIZE;
return len;
}
int frct_pci_ser(struct shm_du_buff * sdb,
struct frct_pci * pci,
bool error_check)
{
uint8_t * head;
uint8_t * tail;
size_t len;
size_t offset = 0;
assert(sdb);
assert(pci);
len = get_head_len(pci);
head = shm_du_buff_head_alloc(sdb, len);
if (head == NULL)
return -EPERM;
memcpy(head, &pci->type, TYPE_SIZE);
offset += TYPE_SIZE;
memcpy(head + offset, &pci->flags, FLAGS_SIZE);
offset += FLAGS_SIZE;
memcpy(head + offset, &pci->seqno, SEQNO_SIZE);
offset += SEQNO_SIZE;
if (pci->type & PDU_TYPE_CONFIG) {
memcpy(head + offset, &pci->conf_flags, CONF_FLAGS_SIZE);
/* offset += CONF_FLAGS_SIZE; */
}
if (error_check) {
tail = shm_du_buff_tail_alloc(sdb, hash_len(HASH_CRC32));
if (tail == NULL) {
shm_du_buff_head_release(sdb, len);
return -EPERM;
}
*((uint32_t *) tail) = 0;
mem_hash(HASH_CRC32, (uint32_t *) tail, head, tail - head);
}
return 0;
}
int frct_pci_des(struct shm_du_buff * sdb,
struct frct_pci * pci,
bool error_check)
{
uint8_t * head;
uint8_t * tail;
uint32_t crc;
uint32_t crc2;
size_t offset = 0;
assert(sdb);
assert(pci);
head = shm_du_buff_head(sdb);
/* Depending on the type a different deserialization. */
memcpy(&pci->type, head, TYPE_SIZE);
offset += TYPE_SIZE;
memcpy(&pci->flags, head + offset, FLAGS_SIZE);
offset += FLAGS_SIZE;
memcpy(&pci->seqno, head + offset, SEQNO_SIZE);
offset += SEQNO_SIZE;
if (pci->type & PDU_TYPE_CONFIG) {
memcpy(&pci->conf_flags, head + offset, CONF_FLAGS_SIZE);
/* offset += CONF_FLAGS_SIZE; */
}
if (error_check) {
tail = shm_du_buff_tail(sdb);
if (tail == NULL)
return -EPERM;
mem_hash(HASH_CRC32, &crc, head,
tail - head - hash_len(HASH_CRC32));
memcpy(&crc2, tail - hash_len(HASH_CRC32),
hash_len(HASH_CRC32));
/* Corrupted SDU. */
if (crc != crc2)
return -1;
shm_du_buff_tail_release(sdb, hash_len(HASH_CRC32));
}
shm_du_buff_head_release(sdb, get_head_len(pci));
return 0;
}
|
