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
|
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include "host/ble_hs.h"
#include "ble_hs_priv.h"
/**
* Allocates an mbuf for use by the nimble host.
*/
static struct os_mbuf *
ble_hs_mbuf_gen_pkt(uint16_t leading_space)
{
struct os_mbuf *om;
int rc;
om = os_msys_get_pkthdr(0, 0);
if (om == NULL) {
return NULL;
}
if (om->om_omp->omp_databuf_len < leading_space) {
rc = os_mbuf_free_chain(om);
BLE_HS_DBG_ASSERT_EVAL(rc == 0);
return NULL;
}
om->om_data += leading_space;
return om;
}
/**
* Allocates an mbuf with no leading space.
*
* @return An empty mbuf on success; null on memory
* exhaustion.
*/
struct os_mbuf *
ble_hs_mbuf_bare_pkt(void)
{
return ble_hs_mbuf_gen_pkt(0);
}
/**
* Allocates an mbuf suitable for an HCI ACL data packet.
*
* @return An empty mbuf on success; null on memory
* exhaustion.
*/
struct os_mbuf *
ble_hs_mbuf_acl_pkt(void)
{
return ble_hs_mbuf_gen_pkt(BLE_HCI_DATA_HDR_SZ);
}
/**
* Allocates an mbuf suitable for an L2CAP data packet. The resulting packet
* has sufficient leading space for:
* o ACL data header
* o L2CAP B-frame header
*
* @return An empty mbuf on success; null on memory
* exhaustion.
*/
struct os_mbuf *
ble_hs_mbuf_l2cap_pkt(void)
{
return ble_hs_mbuf_gen_pkt(BLE_HCI_DATA_HDR_SZ + BLE_L2CAP_HDR_SZ);
}
struct os_mbuf *
ble_hs_mbuf_att_pkt(void)
{
/* Prepare write request and response are the larget ATT commands which
* contain attribute data.
*/
return ble_hs_mbuf_gen_pkt(BLE_HCI_DATA_HDR_SZ +
BLE_L2CAP_HDR_SZ +
BLE_ATT_PREP_WRITE_CMD_BASE_SZ);
}
struct os_mbuf *
ble_hs_mbuf_from_flat(const void *buf, uint16_t len)
{
struct os_mbuf *om;
int rc;
om = ble_hs_mbuf_att_pkt();
if (om == NULL) {
return NULL;
}
rc = os_mbuf_copyinto(om, 0, buf, len);
if (rc != 0) {
os_mbuf_free_chain(om);
return NULL;
}
return om;
}
int
ble_hs_mbuf_to_flat(const struct os_mbuf *om, void *flat, uint16_t max_len,
uint16_t *out_copy_len)
{
uint16_t copy_len;
int rc;
if (OS_MBUF_PKTLEN(om) <= max_len) {
copy_len = OS_MBUF_PKTLEN(om);
} else {
copy_len = max_len;
}
rc = os_mbuf_copydata(om, 0, copy_len, flat);
if (rc != 0) {
return BLE_HS_EUNKNOWN;
}
if (copy_len > max_len) {
rc = BLE_HS_EMSGSIZE;
} else {
rc = 0;
}
if (out_copy_len != NULL) {
*out_copy_len = copy_len;
}
return rc;
}
int
ble_hs_mbuf_pullup_base(struct os_mbuf **om, int base_len)
{
if (OS_MBUF_PKTLEN(*om) < base_len) {
return BLE_HS_EBADDATA;
}
*om = os_mbuf_pullup(*om, base_len);
if (*om == NULL) {
return BLE_HS_ENOMEM;
}
return 0;
}
|
