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
|
/*
* Ouroboros - Copyright (C) 2016
*
* Protocol Control Information in Shared Memory Map
*
* Dimitri Staessens <dimitri.staessens@intec.ugent.be>
* Sander Vrijders <sander.vrijders@intec.ugent.be>
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "shm_pci.h"
#include <stdlib.h>
#include <errno.h>
#define SHM_PCI_HEAD_SIZE(a, b) a.addr_size * 2 + \
a.cep_id_size * 2 + \
a.pdu_length_size + \
b.ttl_size + \
a.seqno_size + \
a.qos_id_size
#define SHM_PCI_TAIL_SIZE(b) b.chk_size
#define OUROBOROS_PREFIX "ipcpd/shm_pci"
#include <ouroboros/logs.h>
struct shm_pci {
/* head */
uint8_t * dst_addr;
uint8_t * src_addr;
uint8_t * dst_cep_id;
uint8_t * src_cep_id;
uint8_t * pdu_length;
uint8_t * ttl;
uint8_t * seqno;
uint8_t * qos_id;
uint8_t * chk;
struct shm_du_buff * dub;
struct ipcp_dtp_const dtpc;
struct ipcp_dup_const dupc;
};
shm_pci_t * shm_pci_create(struct shm_du_buff * dub,
const struct ipcp_dtp_const * dtpc,
const struct ipcp_dup_const * dupc)
{
struct shm_pci * p;
if (dub == NULL) {
LOG_DBGF("Bogus input. Bugging out.");
return NULL;
}
p = malloc(sizeof *p);
if (p == NULL)
return NULL;
p->dub = dub;
p->dtpc = *dtpc;
p->dupc = *dupc;
p->dst_addr = NULL;
p->src_addr = NULL;
p->dst_cep_id = NULL;
p->src_cep_id = NULL;
p->pdu_length = NULL;
p->ttl = NULL;
p->seqno = NULL;
p->qos_id = NULL;
p->chk = NULL;
return p;
}
void shm_pci_destroy(shm_pci_t * pci)
{
free(pci);
}
int shm_pci_init(shm_pci_t * pci)
{
if (pci == NULL) {
LOG_DBGF("Bogus input. Bugging out.");
return -EINVAL;
}
uint8_t * pci_head = shm_du_buff_head_alloc(
pci->dub, SHM_PCI_HEAD_SIZE(pci->dtpc, pci->dupc));
uint8_t * pci_tail = shm_du_buff_tail_alloc(
pci->dub, SHM_PCI_TAIL_SIZE(pci->dupc));
if (pci_head == NULL) {
LOG_DBG("Failed to allocate space for PCI at head.");
return -ENOBUFS;
}
if (pci_tail == NULL) {
LOG_DBG("Failed to allocate space for PCI at tail.");
return -ENOBUFS;
}
pci->dst_addr = pci_head;
pci->src_addr = (pci_head += pci->dtpc.addr_size);
pci->dst_cep_id = (pci_head += pci->dtpc.addr_size);
pci->src_cep_id = (pci_head += pci->dtpc.cep_id_size);
pci->pdu_length = (pci_head += pci->dtpc.cep_id_size);
pci->ttl = (pci_head += pci->dtpc.pdu_length_size);
pci->seqno = (pci_head += pci->dupc.ttl_size);
pci->qos_id = (pci_head += pci->dtpc.seqno_size);
pci->chk = (pci_tail);
return 0;
}
void shm_pci_release(shm_pci_t * pci)
{
if (pci == NULL)
return;
if (pci->dub == NULL)
return;
shm_du_buff_head_release(pci->dub, SHM_PCI_HEAD_SIZE(pci->dtpc,
pci->dupc));
shm_du_buff_tail_release(pci->dub, SHM_PCI_TAIL_SIZE(pci->dupc));
}
|
