1 |
pcg |
1.1 |
/* |
2 |
|
|
ROHC Project 2003 at Lulea University of Technology, Sweden. |
3 |
|
|
Authors: Andreas Vernersson <andver-8@student.luth.se> |
4 |
|
|
Daniel Pettersson <danpet-7@student.luth.se> |
5 |
|
|
Erik Soderstrom <soderstrom@yahoo.com> |
6 |
|
|
Fredrik Lindstrom <frelin-9@student.luth.se> |
7 |
|
|
Johan Stenmark <johste-8@student.luth.se> |
8 |
|
|
Martin Juhlin <juhlin@users.sourceforge.net> |
9 |
|
|
Mikael Larsson <larmik-9@student.luth.se> |
10 |
|
|
Robert Maxe <robmax-1@student.luth.se> |
11 |
|
|
|
12 |
|
|
Copyright (C) 2003 Andreas Vernersson, Daniel Pettersson, |
13 |
|
|
Erik Soderström, Fredrik Lindström, Johan Stenmark, |
14 |
|
|
Martin Juhlin, Mikael Larsson, Robert Maxe. |
15 |
|
|
|
16 |
|
|
This program is free software; you can redistribute it and/or modify |
17 |
|
|
it under the terms of the GNU General Public License as published by |
18 |
|
|
the Free Software Foundation; either version 2 of the License, or |
19 |
|
|
(at your option) any later version. |
20 |
|
|
|
21 |
|
|
This program is distributed in the hope that it will be useful, |
22 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
23 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
24 |
|
|
GNU General Public License for more details. |
25 |
|
|
|
26 |
|
|
You should have received a copy of the GNU General Public License |
27 |
|
|
along with this program; if not, write to the Free Software |
28 |
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
29 |
|
|
*/ |
30 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
31 |
|
|
#include "comp.h" |
32 |
|
|
#include "c_util.h" |
33 |
|
|
#include "feedback.h" |
34 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
35 |
|
|
// Builds a feedback1-package |
36 |
|
|
// Param sn: sequence-number |
37 |
|
|
// Param f: pointer to feedback packet |
38 |
|
|
// Return: true if build was ok |
39 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
40 |
|
|
bool f_feedback1(int sn, struct sd_feedback * f) |
41 |
|
|
{ |
42 |
|
|
// int req_sn_bits = calc_feedback_sn_size(); //check if feddback1 is ok .. |
43 |
|
|
// if (req_sn_bits < 9) { |
44 |
|
|
f->feedback_type = 1; //set type for add_option |
45 |
|
|
f->size = 1; |
46 |
|
|
f->feedback[0] = (sn & 0xFF); |
47 |
|
|
return true; |
48 |
|
|
// } |
49 |
|
|
// return false; |
50 |
|
|
} |
51 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
52 |
|
|
// Builds a feedback2-package |
53 |
|
|
// Param achtype: ACK, NACK or S-NACK |
54 |
|
|
// Param mode: mode in which ROHC operates; U-, O- or R-MODE |
55 |
|
|
// Param sn: sequence-number |
56 |
|
|
// Param f: pointer to feedback packet |
57 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
58 |
|
|
void f_feedback2(int acktype, int mode, int sn, struct sd_feedback * f) |
59 |
|
|
{ |
60 |
|
|
// int req_sn_bits=-1; |
61 |
|
|
char tkn = (sn & 0xFF); |
62 |
|
|
f->size = 2; // size of feedback-2 head |
63 |
|
|
|
64 |
|
|
f->feedback_type = 2; //set type for add_option |
65 |
|
|
|
66 |
|
|
f->feedback[0] = (acktype & 0x3) << 6 | (mode & 0x3) << 4; |
67 |
|
|
|
68 |
|
|
// req_sn_bits = calc_feedback_sn_size(); |
69 |
|
|
|
70 |
|
|
if(sn < 255){ //12 bits sn |
71 |
|
|
// if(req_sn_bits < 13){ |
72 |
|
|
f->feedback[0] |= (sn & 0xF00) >> 8; |
73 |
|
|
f->feedback[1] = sn & 0xFF; |
74 |
|
|
} else { //20 bits sn |
75 |
|
|
f->feedback[0] |= (sn & 0xF0000) >> 16; |
76 |
|
|
f->feedback[1] = sn & 0xFF00 >> 8; |
77 |
|
|
f_add_option(f, OPT_TYPE_SN, &tkn); //return ! important .. |
78 |
|
|
} |
79 |
|
|
} |
80 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
81 |
|
|
// Adds an option data for feedback2 |
82 |
|
|
// Param f: pointer to feedback packet |
83 |
|
|
// Param opt_type: type of option to be added |
84 |
|
|
// Param data: the option data |
85 |
|
|
// Return: 0 if failed, 1 if ok |
86 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
87 |
|
|
bool f_add_option(struct sd_feedback * f, int opt_type, char * data) |
88 |
|
|
{ |
89 |
|
|
if (f->feedback_type == 2) { |
90 |
|
|
f->feedback[f->size] = opt_type & 0xF; |
91 |
|
|
f->feedback[f->size] <<= 4; |
92 |
|
|
f->feedback[f->size] = (data ? 1 : 0) | f->feedback[f->size]; |
93 |
|
|
f->size++; |
94 |
|
|
|
95 |
|
|
if(opt_type == OPT_TYPE_CRC || data) { |
96 |
|
|
if(opt_type == OPT_TYPE_CRC) |
97 |
|
|
f->feedback[f->size] = 0; |
98 |
|
|
else |
99 |
|
|
f->feedback[f->size] = data[0]; |
100 |
|
|
f->size++; |
101 |
|
|
} |
102 |
|
|
return true; |
103 |
|
|
} |
104 |
|
|
return false; |
105 |
|
|
} |
106 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
107 |
|
|
// Appends the cid on the feedback packet |
108 |
|
|
// Param f: pointer to the feedback packet |
109 |
|
|
// Param cid: the context-id |
110 |
|
|
// Param largecidUsed: ==1 if largecid is used |
111 |
|
|
// Return: true if cid was successfully appended, else false |
112 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
113 |
|
|
bool f_append_cid(struct sd_feedback * f, int cid, int largecidUsed) |
114 |
|
|
{ |
115 |
|
|
char * acid; |
116 |
|
|
int largecidsize, i; |
117 |
|
|
|
118 |
|
|
if(largecidUsed) { // largecid |
119 |
|
|
largecidsize = c_bytesSdvl(cid); |
120 |
|
|
if(f->size+largecidsize > 30) { |
121 |
|
|
rohc_debugf(0, "ERROR [feedback.c - f_append_cid()]: Array to small!\n"); |
122 |
|
|
return(false); |
123 |
|
|
} else { |
124 |
|
|
for(i=f->size-1; i>=0; i--) |
125 |
|
|
f->feedback[i+largecidsize] = f->feedback[i]; |
126 |
|
|
} |
127 |
|
|
acid = (char*)kmalloc(largecidsize, GFP_ATOMIC); |
128 |
|
|
if(!acid) { |
129 |
|
|
f->size = 0; |
130 |
|
|
return(false); |
131 |
|
|
} |
132 |
|
|
if(!c_encodeSdvl(acid, cid)) { |
133 |
|
|
rohc_debugf(0, "ERROR [feedback.c - f_append_cid()]: This should never happen!\n"); |
134 |
|
|
return(false); |
135 |
|
|
} |
136 |
|
|
memcpy(f->feedback, acid, largecidsize); |
137 |
|
|
kfree(acid); |
138 |
|
|
f->size += largecidsize; |
139 |
|
|
} else { |
140 |
|
|
if(cid > 0 && cid < 16) { |
141 |
|
|
for(i = f->size-1; i>=0; i--) |
142 |
|
|
f->feedback[i+1] = f->feedback[i]; |
143 |
|
|
f->feedback[0] = 0xE0; |
144 |
|
|
f->feedback[0] = (cid & 0xF) | f->feedback[0]; |
145 |
|
|
f->size++; |
146 |
|
|
} |
147 |
|
|
} |
148 |
|
|
return(true); |
149 |
|
|
} |
150 |
|
|
|
151 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
152 |
|
|
// Wrap the feedback packet and add a CRC-option if specified |
153 |
|
|
// Param f: the pointer to the feedback packet |
154 |
|
|
// Param cid: the context-id |
155 |
|
|
// Param largecidUsed: ==1 if largecid is used, else ==0 |
156 |
|
|
// Param with_crc: if ==1, the CRC option will be added to the feedback packet |
157 |
|
|
// Param final_size: final size of the feedback packet will be written to this variable |
158 |
|
|
// Return: NULL if failed, otherwise the pointer to the feedback packet |
159 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |
160 |
|
|
char * f_wrap_feedback(struct sd_feedback * f, int cid, int largecidUsed, int with_crc, int * final_size) |
161 |
|
|
{ |
162 |
|
|
unsigned int crc; |
163 |
|
|
char * feedback; |
164 |
|
|
|
165 |
|
|
if (!f_append_cid(f, cid, largecidUsed)) |
166 |
|
|
return NULL; |
167 |
|
|
if(with_crc) { |
168 |
|
|
f_add_option(f, OPT_TYPE_CRC, (char*)1); |
169 |
|
|
feedback = (char*)kmalloc(f->size, GFP_ATOMIC); |
170 |
|
|
if (!feedback) { |
171 |
|
|
f->size = 0; |
172 |
|
|
return NULL; |
173 |
|
|
} |
174 |
|
|
memcpy(feedback, f->feedback, f->size); |
175 |
|
|
crc = crc_calculate(CRC_TYPE_8, feedback, f->size); |
176 |
|
|
feedback[f->size-1] = (char)(crc & 0xFF); |
177 |
|
|
*final_size = f->size; |
178 |
|
|
f->size = 0; |
179 |
|
|
return(feedback); |
180 |
|
|
} |
181 |
|
|
|
182 |
|
|
feedback = (char*)kmalloc(f->size, GFP_ATOMIC); |
183 |
|
|
if (!feedback) { |
184 |
|
|
f->size = 0; |
185 |
|
|
return NULL; |
186 |
|
|
} |
187 |
|
|
memcpy(feedback, f->feedback, f->size); |
188 |
|
|
*final_size = f->size; |
189 |
|
|
f->size = 0; |
190 |
|
|
return(feedback); |
191 |
|
|
} |
192 |
|
|
//---------------------------------------------------------------------------------------------------------------------------------- |