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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Sjur Brendeland
* License terms: GNU General Public License (GPL) version 2
*/
#ifndef CFPKT_H_
#define CFPKT_H_
#include <net/caif/caif_layer.h>
#include <linux/types.h>
struct cfpkt;
/* Create a CAIF packet.
* len: Length of packet to be created
* @return New packet.
*/
struct cfpkt *cfpkt_create(u16 len);
/*
* Destroy a CAIF Packet.
* pkt Packet to be destoyed.
*/
void cfpkt_destroy(struct cfpkt *pkt);
/*
* Extract header from packet.
*
* pkt Packet to extract header data from.
* data Pointer to copy the header data into.
* len Length of head data to copy.
* @return zero on success and error code upon failure
*/
int cfpkt_extr_head(struct cfpkt *pkt, void *data, u16 len);
static inline u8 cfpkt_extr_head_u8(struct cfpkt *pkt)
{
u8 tmp;
cfpkt_extr_head(pkt, &tmp, 1);
return tmp;
}
static inline u16 cfpkt_extr_head_u16(struct cfpkt *pkt)
{
__le16 tmp;
cfpkt_extr_head(pkt, &tmp, 2);
return le16_to_cpu(tmp);
}
static inline u32 cfpkt_extr_head_u32(struct cfpkt *pkt)
{
__le32 tmp;
cfpkt_extr_head(pkt, &tmp, 4);
return le32_to_cpu(tmp);
}
/*
* Peek header from packet.
* Reads data from packet without changing packet.
*
* pkt Packet to extract header data from.
* data Pointer to copy the header data into.
* len Length of head data to copy.
* @return zero on success and error code upon failure
*/
int cfpkt_peek_head(struct cfpkt *pkt, void *data, u16 len);
/*
* Extract header from trailer (end of packet).
*
* pkt Packet to extract header data from.
* data Pointer to copy the trailer data into.
* len Length of header data to copy.
* @return zero on success and error code upon failure
*/
int cfpkt_extr_trail(struct cfpkt *pkt, void *data, u16 len);
/*
* Add header to packet.
*
*
* pkt Packet to add header data to.
* data Pointer to data to copy into the header.
* len Length of header data to copy.
* @return zero on success and error code upon failure
*/
int cfpkt_add_head(struct cfpkt *pkt, const void *data, u16 len);
/*
* Add trailer to packet.
*
*
* pkt Packet to add trailer data to.
* data Pointer to data to copy into the trailer.
* len Length of trailer data to copy.
* @return zero on success and error code upon failure
*/
int cfpkt_add_trail(struct cfpkt *pkt, const void *data, u16 len);
/*
* Pad trailer on packet.
* Moves data pointer in packet, no content copied.
*
* pkt Packet in which to pad trailer.
* len Length of padding to add.
* @return zero on success and error code upon failure
*/
int cfpkt_pad_trail(struct cfpkt *pkt, u16 len);
/*
* Add a single byte to packet body (tail).
*
* pkt Packet in which to add byte.
* data Byte to add.
* @return zero on success and error code upon failure
*/
int cfpkt_addbdy(struct cfpkt *pkt, const u8 data);
/*
* Add a data to packet body (tail).
*
* pkt Packet in which to add data.
* data Pointer to data to copy into the packet body.
* len Length of data to add.
* @return zero on success and error code upon failure
*/
int cfpkt_add_body(struct cfpkt *pkt, const void *data, u16 len);
/*
* Checks whether there are more data to process in packet.
* pkt Packet to check.
* @return true if more data are available in packet false otherwise
*/
bool cfpkt_more(struct cfpkt *pkt);
/*
* Checks whether the packet is erroneous,
* i.e. if it has been attempted to extract more data than available in packet
* or writing more data than has been allocated in cfpkt_create().
* pkt Packet to check.
* @return true on error false otherwise
*/
bool cfpkt_erroneous(struct cfpkt *pkt);
/*
* Get the packet length.
* pkt Packet to get length from.
* @return Number of bytes in packet.
*/
u16 cfpkt_getlen(struct cfpkt *pkt);
/*
* Set the packet length, by adjusting the trailer pointer according to length.
* pkt Packet to set length.
* len Packet length.
* @return Number of bytes in packet.
*/
int cfpkt_setlen(struct cfpkt *pkt, u16 len);
/*
* cfpkt_append - Appends a packet's data to another packet.
* dstpkt: Packet to append data into, WILL BE FREED BY THIS FUNCTION
* addpkt: Packet to be appended and automatically released,
* WILL BE FREED BY THIS FUNCTION.
* expectlen: Packet's expected total length. This should be considered
* as a hint.
* NB: Input packets will be destroyed after appending and cannot be used
* after calling this function.
* @return The new appended packet.
*/
struct cfpkt *cfpkt_append(struct cfpkt *dstpkt, struct cfpkt *addpkt,
u16 expectlen);
/*
* cfpkt_split - Split a packet into two packets at the specified split point.
* pkt: Packet to be split (will contain the first part of the data on exit)
* pos: Position to split packet in two parts.
* @return The new packet, containing the second part of the data.
*/
struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos);
/*
* Iteration function, iterates the packet buffers from start to end.
*
* Checksum iteration function used to iterate buffers
* (we may have packets consisting of a chain of buffers)
* pkt: Packet to calculate checksum for
* iter_func: Function pointer to iteration function
* chks: Checksum calculated so far.
* buf: Pointer to the buffer to checksum
* len: Length of buf.
* data: Initial checksum value.
* @return Checksum of buffer.
*/
int cfpkt_iterate(struct cfpkt *pkt,
u16 (*iter_func)(u16 chks, void *buf, u16 len),
u16 data);
/* Map from a "native" packet (e.g. Linux Socket Buffer) to a CAIF packet.
* dir - Direction indicating whether this packet is to be sent or received.
* nativepkt - The native packet to be transformed to a CAIF packet
* @return The mapped CAIF Packet CFPKT.
*/
struct cfpkt *cfpkt_fromnative(enum caif_direction dir, void *nativepkt);
/* Map from a CAIF packet to a "native" packet (e.g. Linux Socket Buffer).
* pkt - The CAIF packet to be transformed into a "native" packet.
* @return The native packet transformed from a CAIF packet.
*/
void *cfpkt_tonative(struct cfpkt *pkt);
/*
* Returns packet information for a packet.
* pkt Packet to get info from;
* @return Packet information
*/
struct caif_payload_info *cfpkt_info(struct cfpkt *pkt);
/** cfpkt_set_prio - set priority for a CAIF packet.
*
* @pkt: The CAIF packet to be adjusted.
* @prio: one of TC_PRIO_ constants.
*/
void cfpkt_set_prio(struct cfpkt *pkt, int prio);
#endif /* CFPKT_H_ */
|
