| 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 |
|
|
Implementation of the udp-lite profile (compressor) |
| 32 |
|
|
*/ |
| 33 |
|
|
|
| 34 |
|
|
#include <linux/ip.h> |
| 35 |
|
|
|
| 36 |
|
|
#include "rohc.h" |
| 37 |
|
|
#include "comp.h" |
| 38 |
|
|
#include "c_util.h" |
| 39 |
|
|
|
| 40 |
|
|
|
| 41 |
|
|
|
| 42 |
|
|
static const char *udp_lite_packet_types[] = { |
| 43 |
|
|
"IR", "IRDYN", "OU-0", "OU-1", "OU-2" |
| 44 |
|
|
}; |
| 45 |
|
|
|
| 46 |
|
|
|
| 47 |
|
|
static const char *udp_lite_extension_types[] = { |
| 48 |
|
|
"NOEXT", "EXT0", "EXT1", "EXT2", "EXT3" |
| 49 |
|
|
}; |
| 50 |
|
|
|
| 51 |
|
|
#define UDP_LITE_PRNR 254 |
| 52 |
|
|
|
| 53 |
|
|
#define MAX_LITE_COUNT 2 |
| 54 |
|
|
|
| 55 |
|
|
/* |
| 56 |
|
|
Structure that contain counters, flags and structures that need to saved between different |
| 57 |
|
|
packages. A context have a structure like this for the two first ip-headers. |
| 58 |
|
|
*/ |
| 59 |
|
|
struct sc_udp_lite_header |
| 60 |
|
|
{ |
| 61 |
|
|
struct sc_wlsb *ip_id_window; |
| 62 |
|
|
struct iphdr old_ip; |
| 63 |
|
|
|
| 64 |
|
|
int tos_count, ttl_count, df_count, protocol_count; |
| 65 |
|
|
int rnd_count, nbo_count; |
| 66 |
|
|
int old_rnd,old_nbo; |
| 67 |
|
|
int id_delta; |
| 68 |
|
|
|
| 69 |
|
|
}; |
| 70 |
|
|
/* |
| 71 |
|
|
Structure that contain variables that are temporar, i.e. they will only be jused in this |
| 72 |
|
|
packet, they have to be reinitilized every time a new packet arrive. |
| 73 |
|
|
*/ |
| 74 |
|
|
struct udp_lite_tmp_variables{ |
| 75 |
|
|
// The following variables are set in encode |
| 76 |
|
|
int nr_of_ip_hdr; |
| 77 |
|
|
unsigned short changed_fields; |
| 78 |
|
|
unsigned short changed_fields2; |
| 79 |
|
|
int send_static; |
| 80 |
|
|
int send_dynamic; |
| 81 |
|
|
int nr_ip_id_bits; |
| 82 |
|
|
int nr_sn_bits; |
| 83 |
|
|
int nr_ip_id_bits2; |
| 84 |
|
|
int packet_type; |
| 85 |
|
|
int max_size; |
| 86 |
|
|
|
| 87 |
|
|
int udp_size; |
| 88 |
|
|
}; |
| 89 |
|
|
|
| 90 |
|
|
/* |
| 91 |
|
|
Structure that contain counters, flags and structures that need to saved between different |
| 92 |
|
|
packages. Every context have one of these |
| 93 |
|
|
*/ |
| 94 |
|
|
struct sc_udp_lite_context { |
| 95 |
|
|
unsigned int sn; |
| 96 |
|
|
struct sc_wlsb *sn_window; |
| 97 |
|
|
|
| 98 |
|
|
int ir_count, fo_count, so_count; |
| 99 |
|
|
int go_back_fo_count, go_back_ir_count, ir_dyn_count; |
| 100 |
|
|
//int udp_checksum_change_count; |
| 101 |
|
|
int cfp,cfi; |
| 102 |
|
|
unsigned char FK; |
| 103 |
|
|
int coverage_equal_count, coverage_inferred_count; |
| 104 |
|
|
int tmp_coverage; |
| 105 |
|
|
int sent_ce_on_count, sent_ce_off_count, sent_ce_only_count; |
| 106 |
|
|
|
| 107 |
|
|
struct sc_udp_lite_header ip_flags, ip2_flags; |
| 108 |
|
|
struct udphdr old_udp_lite; |
| 109 |
|
|
|
| 110 |
|
|
struct udp_lite_tmp_variables tmp_variables; |
| 111 |
|
|
int is_initialized; // if ip2 is initialized |
| 112 |
|
|
|
| 113 |
|
|
}; |
| 114 |
|
|
|
| 115 |
|
|
|
| 116 |
|
|
static void udp_lite_decide_state(int send_udp_dynamic, struct sc_context *context); |
| 117 |
|
|
|
| 118 |
|
|
static void c_udp_lite_update_variables(struct sc_context *context,const struct iphdr *ip, |
| 119 |
|
|
const struct iphdr *ip2); |
| 120 |
|
|
|
| 121 |
|
|
static int udp_lite_decide_packet(struct sc_context *context); |
| 122 |
|
|
|
| 123 |
|
|
static int udp_lite_decide_FO_packet(struct sc_context *context); |
| 124 |
|
|
|
| 125 |
|
|
static int udp_lite_decide_SO_packet(const struct sc_context *context); |
| 126 |
|
|
|
| 127 |
|
|
static void udp_lite_periodic_down_transition(struct sc_context *context); |
| 128 |
|
|
|
| 129 |
|
|
static int udp_lite_code_packet(struct sc_udp_lite_context *udp_lite_profile,const struct iphdr *ip, |
| 130 |
|
|
const struct iphdr *ip2,const struct udphdr *udp_lite,unsigned char *dest, struct sc_context *context); |
| 131 |
|
|
|
| 132 |
|
|
|
| 133 |
|
|
int udp_lite_code_IR_packet(struct sc_udp_lite_context *udp_lite_profile,const struct iphdr *ip, |
| 134 |
|
|
const struct iphdr *ip2,const struct udphdr *udp_lite,unsigned char *dest, |
| 135 |
|
|
struct sc_context *context,int counter,int first_position); |
| 136 |
|
|
static int udp_lite_code_IR_DYN_packet(struct sc_udp_lite_context *udp_lite_profile,const struct iphdr *ip, |
| 137 |
|
|
const struct iphdr *ip2,const struct udphdr *udp_lite,unsigned char *dest, |
| 138 |
|
|
struct sc_context *context,int counter,int first_position); |
| 139 |
|
|
|
| 140 |
|
|
|
| 141 |
|
|
static int udp_lite_code_static_part(struct sc_context *context,struct sc_udp_lite_header *ip_hdr_profile,const struct iphdr *ip, |
| 142 |
|
|
unsigned char *dest, int counter); |
| 143 |
|
|
|
| 144 |
|
|
static int udp_lite_code_static_udp_part(struct sc_context *context, |
| 145 |
|
|
const struct udphdr *udp_lite, |
| 146 |
|
|
unsigned char *dest, |
| 147 |
|
|
int counter); |
| 148 |
|
|
|
| 149 |
|
|
static int udp_lite_code_dynamic_part(struct sc_context *context,struct sc_udp_lite_header *ip_hdr_profile,const struct iphdr *ip, |
| 150 |
|
|
unsigned char *dest, int counter,int *rnd, int *nbo); |
| 151 |
|
|
|
| 152 |
|
|
static int udp_lite_code_dynamic_udp_part(struct sc_context *context, |
| 153 |
|
|
const struct udphdr *udp_lite, |
| 154 |
|
|
unsigned char *dest, |
| 155 |
|
|
int counter); |
| 156 |
|
|
|
| 157 |
|
|
static int udp_lite_code_UO0_packet(struct sc_context *context,const struct iphdr *ip, |
| 158 |
|
|
unsigned char *dest, int counter,int first_position); |
| 159 |
|
|
|
| 160 |
|
|
static int udp_lite_code_UO1_packet(struct sc_context *context,const struct iphdr *ip, |
| 161 |
|
|
unsigned char *dest, int counter,int first_position ); |
| 162 |
|
|
|
| 163 |
|
|
static int udp_lite_code_UO2_packet(struct sc_context *context,struct sc_udp_lite_context *udp_lite_profile, |
| 164 |
|
|
const struct iphdr *ip,const struct iphdr *ip2,unsigned char *dest, int counter,int first_position); |
| 165 |
|
|
|
| 166 |
|
|
static int udp_lite_code_EXT0_packet(struct sc_context *context,const struct iphdr *ip, |
| 167 |
|
|
unsigned char *dest, int counter); |
| 168 |
|
|
|
| 169 |
|
|
static int udp_lite_code_EXT1_packet(struct sc_context *context,const struct iphdr *ip, |
| 170 |
|
|
unsigned char *dest, int counter); |
| 171 |
|
|
|
| 172 |
|
|
static int udp_lite_code_EXT2_packet(struct sc_context *context,struct sc_udp_lite_context *udp_lite_profile, |
| 173 |
|
|
const struct iphdr *ip, |
| 174 |
|
|
unsigned char *dest, int counter); |
| 175 |
|
|
|
| 176 |
|
|
static int udp_lite_code_EXT3_packet(struct sc_context *context,struct sc_udp_lite_context *udp_lite_profile, |
| 177 |
|
|
const struct iphdr *ip,const struct iphdr *ip2, |
| 178 |
|
|
unsigned char *dest, int counter); |
| 179 |
|
|
|
| 180 |
|
|
static int udp_lite_header_flags(struct sc_context *context,unsigned short changed_fields,struct sc_udp_lite_header *ip_hdr_profile,int counter, |
| 181 |
|
|
boolean is_outer,int nr_ip_id_bits,const struct iphdr *ip,unsigned char *dest,int context_rnd,int context_nbo); |
| 182 |
|
|
|
| 183 |
|
|
static int udp_lite_header_fields(struct sc_context *context,unsigned short changed_fields,struct sc_udp_lite_header *ip_hdr_profile,int counter, |
| 184 |
|
|
boolean is_outer,int nr_ip_id_bits,const struct iphdr *ip,unsigned char *dest,int context_rnd); |
| 185 |
|
|
|
| 186 |
|
|
static int udp_lite_decide_extension(struct sc_context *context); |
| 187 |
|
|
|
| 188 |
|
|
|
| 189 |
|
|
static int udp_lite_changed_static_both_hdr(struct sc_context *context, |
| 190 |
|
|
const struct iphdr *ip, const struct iphdr *ip2); |
| 191 |
|
|
|
| 192 |
|
|
static int udp_lite_changed_static_one_hdr(unsigned short udp_lite_changed_fields,struct sc_udp_lite_header *ip_header, const struct iphdr *ip, |
| 193 |
|
|
struct sc_context *context); |
| 194 |
|
|
|
| 195 |
|
|
|
| 196 |
|
|
static int udp_lite_changed_dynamic_both_hdr(struct sc_context *context, |
| 197 |
|
|
const struct iphdr *ip, const struct iphdr *ip2); |
| 198 |
|
|
|
| 199 |
|
|
static int udp_lite_changed_dynamic_one_hdr(unsigned short udp_lite_changed_fields,struct sc_udp_lite_header *ip_hdr_profile, const struct iphdr *ip, |
| 200 |
|
|
int context_rnd,int context_nbo,struct sc_context *context); |
| 201 |
|
|
|
| 202 |
|
|
static int udp_lite_changed_udp_dynamic(struct sc_context *context,const struct udphdr *udp_lite); |
| 203 |
|
|
|
| 204 |
|
|
static boolean udp_lite_is_changed(unsigned short udp_lite_changed_fields,unsigned short check_field); |
| 205 |
|
|
|
| 206 |
|
|
static unsigned short udp_lite_changed_fields(struct sc_udp_lite_header *ip_hdr_profile,const struct iphdr *ip); |
| 207 |
|
|
|
| 208 |
|
|
static void udp_lite_change_state(struct sc_context *, C_STATE); |
| 209 |
|
|
static void udp_lite_change_mode(struct sc_context *, C_MODE); |
| 210 |
|
|
|
| 211 |
|
|
static void udp_lite_check_ip_identification(struct sc_udp_lite_header *ip_hdr_profile, const struct iphdr *ip,int *context_rnd, int *context_nbo); |
| 212 |
|
|
|
| 213 |
|
|
static void udp_lite_initiate_coverage_context(struct sc_udp_lite_context *udp_lite_profile, |
| 214 |
|
|
const struct udphdr *udp_lite, unsigned char *dest, struct sc_context *context); |
| 215 |
|
|
|
| 216 |
|
|
static boolean udp_lite_send_ce_packet(struct sc_udp_lite_context *udp_lite_profile, |
| 217 |
|
|
const struct udphdr *udp_lite, unsigned char *dest, |
| 218 |
|
|
struct sc_context *context); |
| 219 |
|
|
|
| 220 |
|
|
/* |
| 221 |
|
|
Initilize one ip-header context |
| 222 |
|
|
*/ |
| 223 |
|
|
void c_udp_lite_init_context(struct sc_udp_lite_header *ip_header,const struct iphdr *ip,int context_rnd,int context_nbo) |
| 224 |
|
|
{ |
| 225 |
|
|
ip_header -> ip_id_window = c_create_wlsb(16,C_WINDOW_WIDTH,0); |
| 226 |
|
|
ip_header->old_ip = *ip; |
| 227 |
|
|
ip_header->old_rnd = context_rnd; |
| 228 |
|
|
ip_header->old_nbo = context_nbo; |
| 229 |
|
|
ip_header->tos_count = MAX_FO_COUNT; |
| 230 |
|
|
ip_header->ttl_count = MAX_FO_COUNT; |
| 231 |
|
|
ip_header->df_count = MAX_FO_COUNT; |
| 232 |
|
|
ip_header->protocol_count = MAX_FO_COUNT; |
| 233 |
|
|
ip_header->rnd_count = MAX_FO_COUNT; |
| 234 |
|
|
ip_header->nbo_count = MAX_FO_COUNT; |
| 235 |
|
|
} |
| 236 |
|
|
|
| 237 |
|
|
/* |
| 238 |
|
|
Initilize all temp variables |
| 239 |
|
|
*/ |
| 240 |
|
|
void c_udp_lite_init_tmp_variables(struct udp_lite_tmp_variables *udp_lite_tmp_variables){ |
| 241 |
|
|
udp_lite_tmp_variables->nr_of_ip_hdr = -1; |
| 242 |
|
|
udp_lite_tmp_variables->changed_fields = -1; |
| 243 |
|
|
udp_lite_tmp_variables->changed_fields2 = -1; |
| 244 |
|
|
udp_lite_tmp_variables->send_static = -1; |
| 245 |
|
|
udp_lite_tmp_variables->send_dynamic = -1; |
| 246 |
|
|
udp_lite_tmp_variables->nr_ip_id_bits = -1; |
| 247 |
|
|
udp_lite_tmp_variables->nr_sn_bits = -1; |
| 248 |
|
|
udp_lite_tmp_variables->nr_ip_id_bits2 = -1; |
| 249 |
|
|
udp_lite_tmp_variables->packet_type = -1; |
| 250 |
|
|
udp_lite_tmp_variables->max_size = -1; |
| 251 |
|
|
udp_lite_tmp_variables->udp_size = -1; |
| 252 |
|
|
|
| 253 |
|
|
} |
| 254 |
|
|
|
| 255 |
|
|
/* |
| 256 |
|
|
Function to allocate for a new context, it aslo initilize alot of variables. |
| 257 |
|
|
This function is one of the functions that must exist for the framework to |
| 258 |
|
|
work. Please notice that a pointer to this function has to exist in the |
| 259 |
|
|
sc_profile struct thatwe have in the bottom of this file. |
| 260 |
|
|
*/ |
| 261 |
|
|
int c_udp_lite_create(struct sc_context *context, const struct iphdr *ip) |
| 262 |
|
|
{ |
| 263 |
|
|
struct sc_udp_lite_context *udp_lite_profile; |
| 264 |
|
|
struct udphdr *udp_lite; |
| 265 |
|
|
struct iphdr *ip2; |
| 266 |
|
|
context->profile_context = kmalloc(sizeof(struct sc_udp_lite_context),GFP_ATOMIC); |
| 267 |
|
|
if (context->profile_context == 0) { |
| 268 |
|
|
rohc_debugf(0,"c_udp_lite_create(): no mem for profile context\n"); |
| 269 |
|
|
return 0; |
| 270 |
|
|
} |
| 271 |
|
|
udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 272 |
|
|
udp_lite_profile->sn = 0; |
| 273 |
|
|
|
| 274 |
|
|
udp_lite_profile -> sn_window = c_create_wlsb(16,C_WINDOW_WIDTH,-1); |
| 275 |
|
|
|
| 276 |
|
|
udp_lite_profile->cfp = 0; |
| 277 |
|
|
udp_lite_profile->cfi = 0; |
| 278 |
|
|
udp_lite_profile->FK = 0; |
| 279 |
|
|
udp_lite_profile->coverage_equal_count = 0; |
| 280 |
|
|
udp_lite_profile->coverage_inferred_count = 0; |
| 281 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 282 |
|
|
udp_lite_profile->sent_ce_on_count = MAX_IR_COUNT; |
| 283 |
|
|
udp_lite_profile->sent_ce_off_count = MAX_IR_COUNT; |
| 284 |
|
|
|
| 285 |
|
|
|
| 286 |
|
|
udp_lite_profile->ir_count = 0; |
| 287 |
|
|
udp_lite_profile->fo_count = 0; |
| 288 |
|
|
udp_lite_profile->so_count = 0; |
| 289 |
|
|
|
| 290 |
|
|
|
| 291 |
|
|
if (ip->protocol == UDP_LITE_PRNR){ |
| 292 |
|
|
udp_lite = (struct udphdr *)(ip+1); |
| 293 |
|
|
}else if(ip->protocol == 4){ |
| 294 |
|
|
ip2=(struct iphdr *)ip+1; |
| 295 |
|
|
if(ip2->protocol == UDP_LITE_PRNR){ |
| 296 |
|
|
udp_lite = (struct udphdr *)(ip+2); |
| 297 |
|
|
} |
| 298 |
|
|
} |
| 299 |
|
|
//udp_lite_profile->old_udp_lite = *udp_lite; |
| 300 |
|
|
|
| 301 |
|
|
udp_lite_profile->go_back_fo_count = 0; |
| 302 |
|
|
udp_lite_profile->go_back_ir_count = 0; |
| 303 |
|
|
udp_lite_profile->ir_dyn_count = 0; |
| 304 |
|
|
c_udp_lite_init_context(&udp_lite_profile->ip_flags,ip,context->rnd,context->nbo); |
| 305 |
|
|
c_udp_lite_init_tmp_variables(&udp_lite_profile->tmp_variables); |
| 306 |
|
|
udp_lite_profile->is_initialized = 0; |
| 307 |
|
|
return 1; |
| 308 |
|
|
} |
| 309 |
|
|
|
| 310 |
|
|
/* |
| 311 |
|
|
Function to deallocate a context. |
| 312 |
|
|
|
| 313 |
|
|
This function is one of the functions that must exist for the framework to |
| 314 |
|
|
work. Please notice that a pointer to this function has to exist in the |
| 315 |
|
|
sc_profile struct thatwe have in the bottom of this file. |
| 316 |
|
|
*/ |
| 317 |
|
|
void c_udp_lite_destroy(struct sc_context *context){ |
| 318 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 319 |
|
|
c_destroy_wlsb(udp_lite_profile->ip_flags.ip_id_window); |
| 320 |
|
|
c_destroy_wlsb(udp_lite_profile->sn_window); |
| 321 |
|
|
|
| 322 |
|
|
if (context->profile_context != 0) |
| 323 |
|
|
kfree(context->profile_context); |
| 324 |
|
|
|
| 325 |
|
|
} |
| 326 |
|
|
|
| 327 |
|
|
/* |
| 328 |
|
|
The function are jused by the framework to check if a package belongs to this context |
| 329 |
|
|
We check that its not framgmented. It is the source and destination addresses in the |
| 330 |
|
|
ip-headers that decides if the package belong to this context, for udp the source and |
| 331 |
|
|
destination ports also have to be the same for the package to be in the same context |
| 332 |
|
|
as a cid. |
| 333 |
|
|
|
| 334 |
|
|
This function is one of the functions that must exist for the framework to |
| 335 |
|
|
work. Please notice that a pointer to this function has to exist in the |
| 336 |
|
|
sc_profile struct that we have in the bottom of this file. |
| 337 |
|
|
*/ |
| 338 |
|
|
int c_udp_lite_check_context(struct sc_context *context, const struct iphdr *ip) |
| 339 |
|
|
{ |
| 340 |
|
|
boolean is_ip_same; |
| 341 |
|
|
boolean is_ip2_same; |
| 342 |
|
|
boolean is_udp_same; |
| 343 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 344 |
|
|
struct udphdr *udp_lite; |
| 345 |
|
|
struct iphdr *ip2; |
| 346 |
|
|
int reserved, dont_fragment, more_fragments, fragment_offset; |
| 347 |
|
|
unsigned short fragment; |
| 348 |
|
|
|
| 349 |
|
|
fragment = ntohs(ip->frag_off); |
| 350 |
|
|
|
| 351 |
|
|
reserved = (fragment >> 15); |
| 352 |
|
|
dont_fragment = (fragment >> 14) & 1; |
| 353 |
|
|
more_fragments = (fragment >> 13) & 1; |
| 354 |
|
|
fragment_offset = fragment & ((1<<14)-1); |
| 355 |
|
|
if(reserved != 0 || more_fragments != 0 || fragment_offset != 0) { |
| 356 |
|
|
rohc_debugf(0,"Fragment error (%d, %d, %d, %d)\n", reserved, dont_fragment, more_fragments, fragment_offset); |
| 357 |
|
|
return -1; |
| 358 |
|
|
} |
| 359 |
|
|
is_ip_same = (udp_lite_profile->ip_flags.old_ip.saddr == ip->saddr) && (udp_lite_profile->ip_flags.old_ip.daddr == ip->daddr); |
| 360 |
|
|
// 1 |
| 361 |
|
|
// udp 17 |
| 362 |
|
|
if (ip->protocol == UDP_LITE_PRNR){ |
| 363 |
|
|
udp_lite = (struct udphdr *)(ip+1); |
| 364 |
|
|
is_udp_same = ((udp_lite_profile->old_udp_lite.source == udp_lite->source) && |
| 365 |
|
|
(udp_lite_profile->old_udp_lite.dest == udp_lite->dest)); |
| 366 |
|
|
return (is_ip_same && is_udp_same); |
| 367 |
|
|
|
| 368 |
|
|
}else if(ip->protocol == 4){ |
| 369 |
|
|
ip2=(struct iphdr *)ip+1; |
| 370 |
|
|
if(ip2->protocol == UDP_LITE_PRNR){ |
| 371 |
|
|
udp_lite = (struct udphdr *)(ip+2); |
| 372 |
|
|
is_udp_same = ((udp_lite_profile->old_udp_lite.source == udp_lite->source) && |
| 373 |
|
|
(udp_lite_profile->old_udp_lite.dest == udp_lite->dest)); |
| 374 |
|
|
is_ip2_same = (udp_lite_profile->ip2_flags.old_ip.saddr == ip2->saddr) && |
| 375 |
|
|
(udp_lite_profile->ip2_flags.old_ip.daddr == ip2->daddr); |
| 376 |
|
|
return (is_ip_same && is_ip2_same && is_udp_same); |
| 377 |
|
|
|
| 378 |
|
|
} |
| 379 |
|
|
else{ |
| 380 |
|
|
return 0; |
| 381 |
|
|
} |
| 382 |
|
|
|
| 383 |
|
|
}else{ |
| 384 |
|
|
return 0; |
| 385 |
|
|
} |
| 386 |
|
|
|
| 387 |
|
|
} |
| 388 |
|
|
|
| 389 |
|
|
|
| 390 |
|
|
|
| 391 |
|
|
// Change the mode of this context |
| 392 |
|
|
void udp_lite_change_mode(struct sc_context *c, C_MODE new_mode) { |
| 393 |
|
|
if(c->c_mode != new_mode){ |
| 394 |
|
|
c->c_mode = new_mode; |
| 395 |
|
|
udp_lite_change_state(c, IR); |
| 396 |
|
|
} |
| 397 |
|
|
} |
| 398 |
|
|
|
| 399 |
|
|
// Change the state of this context |
| 400 |
|
|
void udp_lite_change_state(struct sc_context *c, C_STATE new_state) |
| 401 |
|
|
{ |
| 402 |
|
|
struct sc_udp_lite_context *ip = (struct sc_udp_lite_context *)c->profile_context; |
| 403 |
|
|
|
| 404 |
|
|
// Reset counters only if different state |
| 405 |
|
|
if (c->c_state != new_state) { |
| 406 |
|
|
ip->ir_count = 0; |
| 407 |
|
|
ip->fo_count = 0; |
| 408 |
|
|
ip->so_count = 0; |
| 409 |
|
|
} |
| 410 |
|
|
|
| 411 |
|
|
c->c_state = new_state; |
| 412 |
|
|
} |
| 413 |
|
|
|
| 414 |
|
|
/* |
| 415 |
|
|
Encode packages to a pattern decided by several different factors. |
| 416 |
|
|
1. Checks if we have double ip-headers |
| 417 |
|
|
2. Check if the ip identification field are random and if it has network byte order |
| 418 |
|
|
3. Decide what state we have, ir,fo or so |
| 419 |
|
|
4. Decide how many bits needed to send ip-id and sn fields and most imortant updating |
| 420 |
|
|
the sliding windows. |
| 421 |
|
|
5. Decide what packet to send. |
| 422 |
|
|
6. Code the packet. |
| 423 |
|
|
|
| 424 |
|
|
|
| 425 |
|
|
This function is one of the functions that must exist for the framework to |
| 426 |
|
|
work. Please notice that a pointer to this function has to exist in the |
| 427 |
|
|
sc_profile struct that we have in the bottom of this file. |
| 428 |
|
|
*/ |
| 429 |
|
|
int c_udp_lite_encode(struct sc_context *context, |
| 430 |
|
|
const struct iphdr *ip, |
| 431 |
|
|
int packet_size, |
| 432 |
|
|
unsigned char *dest, |
| 433 |
|
|
int max_size, |
| 434 |
|
|
int *payload_offset) |
| 435 |
|
|
|
| 436 |
|
|
{ |
| 437 |
|
|
int size; |
| 438 |
|
|
int send_udp_dynamic; |
| 439 |
|
|
int reserved, dont_fragment, more_fragments, fragment_offset; |
| 440 |
|
|
unsigned short fragment; |
| 441 |
|
|
|
| 442 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 443 |
|
|
|
| 444 |
|
|
struct iphdr *ip2=(struct iphdr *)ip+1; |
| 445 |
|
|
struct udphdr *udp_lite; |
| 446 |
|
|
udp_lite_profile->tmp_variables.nr_ip_id_bits2 = 0; |
| 447 |
|
|
udp_lite_profile->tmp_variables.changed_fields2=0; |
| 448 |
|
|
udp_lite_profile->tmp_variables.packet_type = c_IR; |
| 449 |
|
|
udp_lite_profile->tmp_variables.max_size = max_size; |
| 450 |
|
|
// 1 |
| 451 |
|
|
// udp UDP_LITE_PRNR |
| 452 |
|
|
if (ip->protocol == UDP_LITE_PRNR){ |
| 453 |
|
|
ip2 = NULL; |
| 454 |
|
|
udp_lite_profile->tmp_variables.nr_of_ip_hdr = 1; |
| 455 |
|
|
//här kanske vi ska fråga andreas |
| 456 |
|
|
udp_lite = (struct udphdr *)(ip+1); |
| 457 |
|
|
udp_lite_profile->tmp_variables.udp_size = packet_size - sizeof(struct iphdr); |
| 458 |
|
|
*payload_offset = 28; |
| 459 |
|
|
}else if(ip->protocol == 4){ |
| 460 |
|
|
udp_lite_profile->tmp_variables.udp_size = packet_size - 2 * sizeof(struct iphdr); |
| 461 |
|
|
if(!udp_lite_profile->is_initialized){ |
| 462 |
|
|
c_udp_lite_init_context(&udp_lite_profile->ip2_flags,ip2,context->rnd2,context->nbo2); |
| 463 |
|
|
udp_lite_profile->is_initialized = 1; |
| 464 |
|
|
} |
| 465 |
|
|
if(ip2->protocol == UDP_LITE_PRNR){ |
| 466 |
|
|
udp_lite = (struct udphdr *)(ip+2); |
| 467 |
|
|
*payload_offset = 48; |
| 468 |
|
|
udp_lite_profile->tmp_variables.nr_of_ip_hdr = 2; |
| 469 |
|
|
} |
| 470 |
|
|
else{ |
| 471 |
|
|
return -1; |
| 472 |
|
|
} |
| 473 |
|
|
}else{ |
| 474 |
|
|
return -1; |
| 475 |
|
|
} |
| 476 |
|
|
|
| 477 |
|
|
if (udp_lite_profile == 0) { |
| 478 |
|
|
rohc_debugf(0,"c_udp_lite_encode(): udp_lite_profile==null\n"); |
| 479 |
|
|
return 0; |
| 480 |
|
|
} |
| 481 |
|
|
|
| 482 |
|
|
fragment = ntohs(ip->frag_off); |
| 483 |
|
|
|
| 484 |
|
|
reserved = (fragment >> 15); |
| 485 |
|
|
dont_fragment = (fragment >> 14) & 1; |
| 486 |
|
|
more_fragments = (fragment >> 13) & 1; |
| 487 |
|
|
fragment_offset = fragment & ((1<<14)-1); |
| 488 |
|
|
if(reserved != 0 || more_fragments != 0 || fragment_offset != 0) { |
| 489 |
|
|
rohc_debugf(0,"Fragment error (%d, %d, %d, %d)\n", reserved, dont_fragment, more_fragments, fragment_offset); |
| 490 |
|
|
return -1; |
| 491 |
|
|
} |
| 492 |
|
|
|
| 493 |
|
|
|
| 494 |
|
|
// 2. Check NBO and RND of IP-ID |
| 495 |
|
|
if (udp_lite_profile->sn != 0){ // skip first packet |
| 496 |
|
|
udp_lite_check_ip_identification(&udp_lite_profile->ip_flags,ip,&context->rnd, &context->nbo); |
| 497 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 498 |
|
|
udp_lite_check_ip_identification(&udp_lite_profile->ip2_flags,ip2,&context->rnd2, &context->nbo2); |
| 499 |
|
|
} |
| 500 |
|
|
} |
| 501 |
|
|
// Update the sequence number every time we encode something. |
| 502 |
|
|
udp_lite_profile->sn = udp_lite_profile->sn + 1; |
| 503 |
|
|
udp_lite_profile->tmp_variables.changed_fields = udp_lite_changed_fields(&udp_lite_profile->ip_flags,ip); |
| 504 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 505 |
|
|
udp_lite_profile->tmp_variables.changed_fields2 = udp_lite_changed_fields(&udp_lite_profile->ip2_flags,ip2); |
| 506 |
|
|
} |
| 507 |
|
|
|
| 508 |
|
|
udp_lite_profile->tmp_variables.send_static = udp_lite_changed_static_both_hdr(context,ip,ip2); |
| 509 |
|
|
udp_lite_profile->tmp_variables.send_dynamic = udp_lite_changed_dynamic_both_hdr(context,ip,ip2); |
| 510 |
|
|
send_udp_dynamic = udp_lite_changed_udp_dynamic(context,udp_lite); |
| 511 |
|
|
|
| 512 |
|
|
rohc_debugf(2,"send_static = %d, send_dynamic = %d\n", udp_lite_profile->tmp_variables.send_static, |
| 513 |
|
|
udp_lite_profile->tmp_variables.send_dynamic); |
| 514 |
|
|
// 3 |
| 515 |
|
|
udp_lite_decide_state(send_udp_dynamic,context); |
| 516 |
|
|
rohc_debugf(2,"ip->id=%d context->sn=%d\n", ntohs(ip->id), udp_lite_profile->sn); |
| 517 |
|
|
|
| 518 |
|
|
// 4 |
| 519 |
|
|
c_udp_lite_update_variables(context,ip,ip2); |
| 520 |
|
|
|
| 521 |
|
|
// 5 |
| 522 |
|
|
udp_lite_profile->tmp_variables.packet_type = udp_lite_decide_packet(context); |
| 523 |
|
|
|
| 524 |
|
|
// 6 |
| 525 |
|
|
size = udp_lite_code_packet(udp_lite_profile,ip,ip2,udp_lite,dest,context); |
| 526 |
|
|
|
| 527 |
|
|
if(size < 0) |
| 528 |
|
|
return -1; |
| 529 |
|
|
|
| 530 |
|
|
if (udp_lite_profile->tmp_variables.packet_type == c_UO2) { |
| 531 |
|
|
int extension = udp_lite_decide_extension(context); |
| 532 |
|
|
|
| 533 |
|
|
rohc_debugf(1, "ROHC-UDP_LITE %s (%s): %d -> %d\n", udp_lite_packet_types[udp_lite_profile->tmp_variables.packet_type], |
| 534 |
|
|
udp_lite_extension_types[extension],*payload_offset, size); |
| 535 |
|
|
} else { |
| 536 |
|
|
rohc_debugf(1, "ROHC-UDP_LITE %s: from %d -> %d\n", udp_lite_packet_types[udp_lite_profile->tmp_variables.packet_type], |
| 537 |
|
|
*payload_offset, size); |
| 538 |
|
|
} |
| 539 |
|
|
|
| 540 |
|
|
|
| 541 |
|
|
|
| 542 |
|
|
udp_lite_profile->ip_flags.old_ip = *ip; |
| 543 |
|
|
|
| 544 |
|
|
udp_lite_profile->ip_flags.old_rnd = context->rnd; |
| 545 |
|
|
udp_lite_profile->ip_flags.old_nbo = context->nbo; |
| 546 |
|
|
|
| 547 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 548 |
|
|
udp_lite_profile->ip2_flags.old_ip = *ip2; |
| 549 |
|
|
udp_lite_profile->ip2_flags.old_rnd = context->rnd2; |
| 550 |
|
|
udp_lite_profile->ip2_flags.old_nbo = context->nbo2; |
| 551 |
|
|
} |
| 552 |
|
|
|
| 553 |
|
|
if (udp_lite_profile->tmp_variables.packet_type == c_IR) |
| 554 |
|
|
context->num_send_ir ++; |
| 555 |
|
|
else if (udp_lite_profile->tmp_variables.packet_type == c_IRDYN) |
| 556 |
|
|
context->num_send_ir_dyn ++; |
| 557 |
|
|
|
| 558 |
|
|
return size; |
| 559 |
|
|
} |
| 560 |
|
|
|
| 561 |
|
|
|
| 562 |
|
|
/* |
| 563 |
|
|
Function that update the profile when feedback has arrived. |
| 564 |
|
|
|
| 565 |
|
|
This function is one of the functions that must exist for the framework to |
| 566 |
|
|
work. Please notice that a pointer to this function has to exist in the |
| 567 |
|
|
sc_profile struct that we have in the bottom of this file. |
| 568 |
|
|
*/ |
| 569 |
|
|
void c_udp_lite_feedback(struct sc_context *context, struct sc_feedback *feedback) |
| 570 |
|
|
{ |
| 571 |
|
|
struct sc_udp_lite_context *ip_context = (struct sc_udp_lite_context *)context->profile_context; |
| 572 |
|
|
unsigned char *p = feedback->data + feedback->specific_offset; |
| 573 |
|
|
|
| 574 |
|
|
if (feedback->type == 1) { // ack |
| 575 |
|
|
unsigned int sn = p[0]; |
| 576 |
|
|
|
| 577 |
|
|
c_ack_sn_wlsb(ip_context->ip_flags.ip_id_window, sn); |
| 578 |
|
|
c_ack_sn_wlsb(ip_context->sn_window, sn); |
| 579 |
|
|
|
| 580 |
|
|
} else if (feedback->type == 2) { // FEEDBACK-2 |
| 581 |
|
|
unsigned int crc = 0, crc_used=0; |
| 582 |
|
|
|
| 583 |
|
|
int sn_not_valid = 0; |
| 584 |
|
|
unsigned char mode = (p[0]>>4) & 3; |
| 585 |
|
|
unsigned int sn = ((p[0] & 15) << 8) + p[1]; |
| 586 |
|
|
int remaining = feedback->specific_size-2; |
| 587 |
|
|
|
| 588 |
|
|
p+=2; |
| 589 |
|
|
|
| 590 |
|
|
while (remaining > 0) { |
| 591 |
|
|
int opt = p[0]>>4; |
| 592 |
|
|
int optlen = p[0] & 0x0f; |
| 593 |
|
|
|
| 594 |
|
|
switch (opt) { |
| 595 |
|
|
case 1: // CRC |
| 596 |
|
|
crc = p[1]; |
| 597 |
|
|
crc_used = 1; |
| 598 |
|
|
p[1] = 0; // set to zero for crc computation.. |
| 599 |
|
|
break; |
| 600 |
|
|
//case 2: // Reject |
| 601 |
|
|
//break; |
| 602 |
|
|
case 3: // SN-Not-Valid |
| 603 |
|
|
sn_not_valid=1; |
| 604 |
|
|
break; |
| 605 |
|
|
case 4: // SN -- TODO: how is several SN options combined? |
| 606 |
|
|
sn = (sn<<8) + p[1]; |
| 607 |
|
|
break; |
| 608 |
|
|
//case 7: // Loss |
| 609 |
|
|
//break; |
| 610 |
|
|
default: |
| 611 |
|
|
rohc_debugf(0,"c_udp_lite_feedback(): Unknown feedback type: %d\n", opt); |
| 612 |
|
|
break; |
| 613 |
|
|
} |
| 614 |
|
|
|
| 615 |
|
|
remaining -= 1 + optlen; |
| 616 |
|
|
p += 1 + optlen; |
| 617 |
|
|
} |
| 618 |
|
|
|
| 619 |
|
|
if (crc_used) { // check crc.. |
| 620 |
|
|
if (crc_calculate(CRC_TYPE_8, feedback->data, feedback->size ) != crc) { |
| 621 |
|
|
rohc_debugf(0,"c_udp_lite_feedback(): crc check failed..(size=%d)\n", feedback->size); |
| 622 |
|
|
return; |
| 623 |
|
|
} |
| 624 |
|
|
} |
| 625 |
|
|
|
| 626 |
|
|
if (mode != 0) { |
| 627 |
|
|
if (crc_used) { |
| 628 |
|
|
udp_lite_change_mode(context, mode); |
| 629 |
|
|
rohc_debugf(1,"c_udp_lite_feedback(): changing mode to %d\n", mode); |
| 630 |
|
|
} else { |
| 631 |
|
|
rohc_debugf(0,"c_udp_lite_feedback(): mode change requested but no crc was given..\n"); |
| 632 |
|
|
} |
| 633 |
|
|
} |
| 634 |
|
|
|
| 635 |
|
|
switch (feedback->acktype) { |
| 636 |
|
|
case ACK: |
| 637 |
|
|
if (sn_not_valid == 0) { |
| 638 |
|
|
c_ack_sn_wlsb(ip_context->ip_flags.ip_id_window, sn); |
| 639 |
|
|
c_ack_sn_wlsb(ip_context->sn_window, sn); |
| 640 |
|
|
} |
| 641 |
|
|
break; |
| 642 |
|
|
|
| 643 |
|
|
case NACK: |
| 644 |
|
|
if (context->c_state == SO){ |
| 645 |
|
|
change_state(context, FO); |
| 646 |
|
|
ip_context->ir_dyn_count = 0; |
| 647 |
|
|
} |
| 648 |
|
|
if(context->c_state == FO){ |
| 649 |
|
|
ip_context->ir_dyn_count = 0; |
| 650 |
|
|
} |
| 651 |
|
|
break; |
| 652 |
|
|
|
| 653 |
|
|
case STATIC_NACK: |
| 654 |
|
|
udp_lite_change_state(context, IR); |
| 655 |
|
|
break; |
| 656 |
|
|
|
| 657 |
|
|
case RESERVED: |
| 658 |
|
|
rohc_debugf(0, "c_udp_lite_feedback(): reserved field used\n"); |
| 659 |
|
|
break; |
| 660 |
|
|
} |
| 661 |
|
|
|
| 662 |
|
|
} else { |
| 663 |
|
|
rohc_debugf(0,"c_udp_lite_feedback(): Feedback type not implemented (%d)\n", feedback->type); |
| 664 |
|
|
} |
| 665 |
|
|
|
| 666 |
|
|
} |
| 667 |
|
|
|
| 668 |
|
|
/* |
| 669 |
|
|
Decide the state that that should be used for this packet |
| 670 |
|
|
The three states are: |
| 671 |
|
|
IR (initialization and refresh). |
| 672 |
|
|
FO (first order). |
| 673 |
|
|
SO (second order). |
| 674 |
|
|
*/ |
| 675 |
|
|
void udp_lite_decide_state(int send_udp_dynamic, struct sc_context *context) |
| 676 |
|
|
{ |
| 677 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 678 |
|
|
int send_static = udp_lite_profile->tmp_variables.send_static; |
| 679 |
|
|
int send_dynamic = udp_lite_profile->tmp_variables.send_dynamic; |
| 680 |
|
|
if(context->c_state == IR && send_dynamic |
| 681 |
|
|
&& udp_lite_profile->ir_count >= MAX_IR_COUNT){ |
| 682 |
|
|
udp_lite_change_state(context, FO); |
| 683 |
|
|
}else if(context->c_state == IR && send_static |
| 684 |
|
|
&& udp_lite_profile->ir_count >= MAX_IR_COUNT){ |
| 685 |
|
|
udp_lite_change_state(context, FO); |
| 686 |
|
|
}else if (context->c_state == IR && udp_lite_profile->ir_count >= MAX_IR_COUNT) { |
| 687 |
|
|
udp_lite_change_state(context, SO); |
| 688 |
|
|
}else if (context->c_state == FO && send_dynamic |
| 689 |
|
|
&& udp_lite_profile->fo_count >= MAX_FO_COUNT) { |
| 690 |
|
|
udp_lite_change_state(context, FO); |
| 691 |
|
|
}else if (context->c_state == FO && send_static |
| 692 |
|
|
&& udp_lite_profile->fo_count >= MAX_FO_COUNT) { |
| 693 |
|
|
udp_lite_change_state(context, FO); |
| 694 |
|
|
}else if (context->c_state == FO && udp_lite_profile->fo_count >= MAX_FO_COUNT) { |
| 695 |
|
|
udp_lite_change_state(context, SO); |
| 696 |
|
|
}else if(context->c_state == SO && send_dynamic){ |
| 697 |
|
|
udp_lite_change_state(context, FO); |
| 698 |
|
|
}else if(context->c_state == SO && send_static){ |
| 699 |
|
|
udp_lite_change_state(context, FO); |
| 700 |
|
|
} |
| 701 |
|
|
if(context->c_mode == U){ |
| 702 |
|
|
udp_lite_periodic_down_transition(context); |
| 703 |
|
|
} |
| 704 |
|
|
|
| 705 |
|
|
} |
| 706 |
|
|
|
| 707 |
|
|
/* |
| 708 |
|
|
A function just to update some variables, only used in encode. Everything in this |
| 709 |
|
|
function could be in encode but to make it more readable we have it here instead. |
| 710 |
|
|
*/ |
| 711 |
|
|
void c_udp_lite_update_variables(struct sc_context *context, |
| 712 |
|
|
const struct iphdr *ip, |
| 713 |
|
|
const struct iphdr *ip2) |
| 714 |
|
|
{ |
| 715 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 716 |
|
|
if (context->nbo) |
| 717 |
|
|
udp_lite_profile->ip_flags.id_delta = (ntohs(ip->id) - udp_lite_profile->sn); |
| 718 |
|
|
else |
| 719 |
|
|
udp_lite_profile->ip_flags.id_delta = ip->id - udp_lite_profile->sn; |
| 720 |
|
|
|
| 721 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 722 |
|
|
if (context->nbo2) |
| 723 |
|
|
udp_lite_profile->ip2_flags.id_delta = (ntohs(ip2->id) - udp_lite_profile->sn); |
| 724 |
|
|
else |
| 725 |
|
|
udp_lite_profile->ip2_flags.id_delta = ip2->id - udp_lite_profile->sn; |
| 726 |
|
|
} |
| 727 |
|
|
|
| 728 |
|
|
|
| 729 |
|
|
rohc_debugf(2,"Get k\n"); |
| 730 |
|
|
rohc_debugf(2,"id_delta: %d\n",udp_lite_profile->ip_flags.id_delta); |
| 731 |
|
|
rohc_debugf(2,"Given that sn: %d\n",udp_lite_profile->sn); |
| 732 |
|
|
udp_lite_profile->tmp_variables.nr_ip_id_bits = c_get_k_wlsb(udp_lite_profile->ip_flags.ip_id_window, udp_lite_profile->ip_flags.id_delta); |
| 733 |
|
|
udp_lite_profile->tmp_variables.nr_sn_bits = c_get_k_wlsb(udp_lite_profile->sn_window, udp_lite_profile->sn); |
| 734 |
|
|
|
| 735 |
|
|
rohc_debugf(2,"Adding\n"); |
| 736 |
|
|
c_add_wlsb(udp_lite_profile->ip_flags.ip_id_window, udp_lite_profile->sn, 0, udp_lite_profile->ip_flags.id_delta); // TODO: replace 0 with time(0) |
| 737 |
|
|
c_add_wlsb(udp_lite_profile->sn_window, udp_lite_profile->sn, 0, udp_lite_profile->sn); // TODO: replace 0 with time(0) |
| 738 |
|
|
|
| 739 |
|
|
rohc_debugf(2,"ip_id bits=%d\n", udp_lite_profile->tmp_variables.nr_ip_id_bits); |
| 740 |
|
|
rohc_debugf(2,"sn bits=%d\n", udp_lite_profile->tmp_variables.nr_sn_bits); |
| 741 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 742 |
|
|
udp_lite_profile->tmp_variables.nr_ip_id_bits2 = c_get_k_wlsb(udp_lite_profile->ip2_flags.ip_id_window, udp_lite_profile->ip2_flags.id_delta); |
| 743 |
|
|
rohc_debugf(2,"ip_id bits2=%d\n", udp_lite_profile->tmp_variables.nr_ip_id_bits2); |
| 744 |
|
|
c_add_wlsb(udp_lite_profile->ip2_flags.ip_id_window, udp_lite_profile->sn, 0, udp_lite_profile->ip2_flags.id_delta); // TODO: replace 0 with time(0) |
| 745 |
|
|
} |
| 746 |
|
|
} |
| 747 |
|
|
|
| 748 |
|
|
/*Function that change state periodicly after a certain number of packets */ |
| 749 |
|
|
void udp_lite_periodic_down_transition(struct sc_context *context) |
| 750 |
|
|
{ |
| 751 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 752 |
|
|
if(udp_lite_profile->go_back_fo_count == CHANGE_TO_FO_COUNT){ |
| 753 |
|
|
udp_lite_profile->go_back_fo_count = 0; |
| 754 |
|
|
udp_lite_profile->ir_dyn_count = 0; |
| 755 |
|
|
udp_lite_change_state(context, FO); |
| 756 |
|
|
|
| 757 |
|
|
} else if(udp_lite_profile->go_back_ir_count == CHANGE_TO_IR_COUNT){ |
| 758 |
|
|
udp_lite_profile->go_back_ir_count = 0; |
| 759 |
|
|
udp_lite_change_state(context, IR); |
| 760 |
|
|
} |
| 761 |
|
|
if (context->c_state == SO) |
| 762 |
|
|
udp_lite_profile->go_back_fo_count++; |
| 763 |
|
|
if(context->c_state == SO || context->c_state == FO) |
| 764 |
|
|
udp_lite_profile->go_back_ir_count++; |
| 765 |
|
|
} |
| 766 |
|
|
|
| 767 |
|
|
/* |
| 768 |
|
|
Decide what packet to send in the different states, |
| 769 |
|
|
In IR state, ir packets are used. In FO and SO the functions udp_lite_decide_FO_packet and udp_lite_decide_SO_packet is used. |
| 770 |
|
|
*/ |
| 771 |
|
|
int udp_lite_decide_packet(struct sc_context *context) |
| 772 |
|
|
{ |
| 773 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 774 |
|
|
int packet_type=IR; |
| 775 |
|
|
switch(context->c_state) |
| 776 |
|
|
{ |
| 777 |
|
|
case IR: |
| 778 |
|
|
rohc_debugf(2,"c_udp_lite_encode(): IR state\n"); |
| 779 |
|
|
udp_lite_profile->ir_count++; |
| 780 |
|
|
packet_type = c_IR; |
| 781 |
|
|
break; |
| 782 |
|
|
case FO: |
| 783 |
|
|
rohc_debugf(2,"c_udp_lite_encode(): FO state\n"); |
| 784 |
|
|
udp_lite_profile->fo_count++; |
| 785 |
|
|
packet_type = udp_lite_decide_FO_packet(context); |
| 786 |
|
|
break; |
| 787 |
|
|
|
| 788 |
|
|
case SO: |
| 789 |
|
|
rohc_debugf(2,"c_udp_lite_encode(): SO state\n"); |
| 790 |
|
|
udp_lite_profile->so_count++; |
| 791 |
|
|
packet_type = udp_lite_decide_SO_packet(context); |
| 792 |
|
|
break; |
| 793 |
|
|
} |
| 794 |
|
|
return packet_type; |
| 795 |
|
|
} |
| 796 |
|
|
|
| 797 |
|
|
/* |
| 798 |
|
|
Decide which packet to send in first order state |
| 799 |
|
|
The packets that can be used is IRDYN and UO2 packets. |
| 800 |
|
|
*/ |
| 801 |
|
|
int udp_lite_decide_FO_packet(struct sc_context *context) |
| 802 |
|
|
{ |
| 803 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 804 |
|
|
if(udp_lite_profile->ir_dyn_count < MAX_FO_COUNT){ |
| 805 |
|
|
udp_lite_profile->ir_dyn_count++; |
| 806 |
|
|
return c_IRDYN; |
| 807 |
|
|
}else if (udp_lite_profile->tmp_variables.send_static) { // if static field changed we must go back to ir |
| 808 |
|
|
return c_UO2; |
| 809 |
|
|
}else if((udp_lite_profile->tmp_variables.nr_of_ip_hdr == 1 && udp_lite_profile->tmp_variables.send_dynamic > 2)){ |
| 810 |
|
|
return c_IRDYN; |
| 811 |
|
|
}else if((udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1 && udp_lite_profile->tmp_variables.send_dynamic > 4)){ |
| 812 |
|
|
return c_IRDYN; |
| 813 |
|
|
} |
| 814 |
|
|
else{ |
| 815 |
|
|
return c_UO2; |
| 816 |
|
|
} |
| 817 |
|
|
|
| 818 |
|
|
} |
| 819 |
|
|
|
| 820 |
|
|
/* |
| 821 |
|
|
Decide which packet to send in second order state |
| 822 |
|
|
Packet that can be used are UO0, UO1, UO2 with or without extensions. |
| 823 |
|
|
*/ |
| 824 |
|
|
int udp_lite_decide_SO_packet(const struct sc_context *context) |
| 825 |
|
|
{ |
| 826 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 827 |
|
|
int nr_ip_id_bits = udp_lite_profile->tmp_variables.nr_ip_id_bits; |
| 828 |
|
|
int nr_ip_id_bits2 = udp_lite_profile->tmp_variables.nr_ip_id_bits2; |
| 829 |
|
|
int nr_sn_bits = udp_lite_profile->tmp_variables.nr_sn_bits; |
| 830 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr == 1){ |
| 831 |
|
|
if(context->rnd == 1 && nr_sn_bits <= 4){ |
| 832 |
|
|
return c_UO0; |
| 833 |
|
|
} |
| 834 |
|
|
else if(nr_sn_bits <= 4 && nr_ip_id_bits == 0){ |
| 835 |
|
|
return c_UO0; |
| 836 |
|
|
} |
| 837 |
|
|
else if(nr_sn_bits == 5 && nr_ip_id_bits == 0){ |
| 838 |
|
|
return c_UO2; |
| 839 |
|
|
} |
| 840 |
|
|
else if(nr_sn_bits <= 5 && nr_ip_id_bits <= 6){ |
| 841 |
|
|
return c_UO1; |
| 842 |
|
|
} |
| 843 |
|
|
else{ |
| 844 |
|
|
return c_UO2; |
| 845 |
|
|
} |
| 846 |
|
|
} |
| 847 |
|
|
else{ |
| 848 |
|
|
if(context->rnd == 1 && context->rnd2 == 1 && nr_sn_bits <= 4){ |
| 849 |
|
|
return c_UO0; |
| 850 |
|
|
} |
| 851 |
|
|
else if(nr_sn_bits <= 4 && (context->rnd == 1 || nr_ip_id_bits == 0) |
| 852 |
|
|
&& (context->rnd2 == 1 || nr_ip_id_bits2 ==0)){ |
| 853 |
|
|
|
| 854 |
|
|
return c_UO0; |
| 855 |
|
|
} |
| 856 |
|
|
else if(nr_sn_bits <= 5 && nr_ip_id_bits <= 6 && (context->rnd2 == 1 || nr_ip_id_bits2 == 0)){ |
| 857 |
|
|
return c_UO1; |
| 858 |
|
|
} |
| 859 |
|
|
else{ |
| 860 |
|
|
return c_UO2; |
| 861 |
|
|
} |
| 862 |
|
|
} |
| 863 |
|
|
} |
| 864 |
|
|
|
| 865 |
|
|
/*Code the given packet type*/ |
| 866 |
|
|
|
| 867 |
|
|
/* |
| 868 |
|
|
Code the given packet type |
| 869 |
|
|
Every given type has its own help function |
| 870 |
|
|
The ir and ir-dyn packet are totally coded by their own functions. The general format |
| 871 |
|
|
for other packets are coded in this function according to the following: |
| 872 |
|
|
|
| 873 |
|
|
0 1 2 3 4 5 6 7 |
| 874 |
|
|
--- --- --- --- --- --- --- --- |
| 875 |
|
|
1 : Add-CID octet : if for small CIDs and CID 1-15 |
| 876 |
|
|
+---+---+---+---+---+---+---+---+ |
| 877 |
|
|
2 | 1 1 1 1 1 0 F K | Outer packet type identifier |
| 878 |
|
|
+---+---+---+---+---+---+---+---+ |
| 879 |
|
|
: : |
| 880 |
|
|
3 / 0, 1, or 2 octets of CID / 1-2 octets if large CIDs |
| 881 |
|
|
: : |
| 882 |
|
|
+---+---+---+---+---+---+---+---+ |
| 883 |
|
|
4 | first octet of base header | (with type indication) |
| 884 |
|
|
+---+---+---+---+---+---+---+---+ |
| 885 |
|
|
5 / remainder of base header / variable number of bits |
| 886 |
|
|
+---+---+---+---+---+---+---+---+ |
| 887 |
|
|
: : |
| 888 |
|
|
6 / Extension (see 5.7.5) / extension, if X = 1 in base header |
| 889 |
|
|
: : |
| 890 |
|
|
--- --- --- --- --- --- --- --- |
| 891 |
|
|
: : |
| 892 |
|
|
7 + IP-ID of outer IPv4 header + 2 octets, if value(RND2) = 1 |
| 893 |
|
|
: : |
| 894 |
|
|
--- --- --- --- --- --- --- --- |
| 895 |
|
|
8 / AH data for outer list / variable (see 5.8.4.2) |
| 896 |
|
|
--- --- --- --- --- --- --- --- |
| 897 |
|
|
: : |
| 898 |
|
|
9 + GRE checksum (see 5.8.4.4) + 2 octets, if GRE flag C = 1 |
| 899 |
|
|
: : |
| 900 |
|
|
--- --- --- --- --- --- --- --- |
| 901 |
|
|
: : |
| 902 |
|
|
10 + IP-ID of inner IPv4 header + 2 octets, if value(RND) = 1 |
| 903 |
|
|
: : |
| 904 |
|
|
--- --- --- --- --- --- --- --- |
| 905 |
|
|
11 / AH data for inner list / variable (see 5.8.4.2) |
| 906 |
|
|
--- --- --- --- --- --- --- --- |
| 907 |
|
|
: : |
| 908 |
|
|
12 + GRE checksum (see 5.8.4.4) + 2 octets, if GRE flag C = 1 |
| 909 |
|
|
: : |
| 910 |
|
|
--- --- --- --- --- --- --- --- |
| 911 |
|
|
: List of : |
| 912 |
|
|
13 / Dynamic chains / variable, given by static chain |
| 913 |
|
|
: for additional IP headers : (includes no SN) |
| 914 |
|
|
--- --- --- --- --- --- --- --- |
| 915 |
|
|
: : 2 octets, |
| 916 |
|
|
14 + UDP-Lite Checksum Coverage + if context(CFP) = 1 or |
| 917 |
|
|
: : if packet type = CE |
| 918 |
|
|
--- --- --- --- --- --- --- --- |
| 919 |
|
|
: : |
| 920 |
|
|
15 + UDP Checksum + 2 octets, |
| 921 |
|
|
: : |
| 922 |
|
|
--- --- --- --- --- --- --- --- |
| 923 |
|
|
|
| 924 |
|
|
8, 9, 11, 12, 13 is not supported. |
| 925 |
|
|
Each profile code 1, 2, 3, 4, 5, 6 is coded in each packets function |
| 926 |
|
|
6, 9, 14, 15 is coded in this function |
| 927 |
|
|
*/ |
| 928 |
|
|
int udp_lite_code_packet(struct sc_udp_lite_context *udp_lite_profile, |
| 929 |
|
|
const struct iphdr *ip, |
| 930 |
|
|
const struct iphdr *ip2, |
| 931 |
|
|
const struct udphdr *udp_lite, |
| 932 |
|
|
unsigned char *dest, |
| 933 |
|
|
struct sc_context *context) |
| 934 |
|
|
{ |
| 935 |
|
|
int counter = 0; |
| 936 |
|
|
int first_position; |
| 937 |
|
|
boolean send_ce_packet; |
| 938 |
|
|
//struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 939 |
|
|
//Both 1 and 3, 2 will be put on first_position |
| 940 |
|
|
counter = code_cid_values(context,dest,udp_lite_profile->tmp_variables.max_size,&first_position); |
| 941 |
|
|
rohc_debugf(2,"counter=%d, first_position=%d .\n",counter,first_position); |
| 942 |
|
|
switch(udp_lite_profile->tmp_variables.packet_type){ |
| 943 |
|
|
case c_IR: |
| 944 |
|
|
rohc_debugf(2,"udp_lite_code_packet(): IR packet..\n"); |
| 945 |
|
|
return udp_lite_code_IR_packet(udp_lite_profile,ip,ip2,udp_lite, |
| 946 |
|
|
dest,context,counter,first_position); |
| 947 |
|
|
break; |
| 948 |
|
|
case c_IRDYN: |
| 949 |
|
|
rohc_debugf(2,"udp_lite_code_packet(): IRDYN packet..\n"); |
| 950 |
|
|
return udp_lite_code_IR_DYN_packet(udp_lite_profile,ip,ip2,udp_lite,dest, |
| 951 |
|
|
context,counter,first_position); |
| 952 |
|
|
break; |
| 953 |
|
|
} |
| 954 |
|
|
send_ce_packet = udp_lite_send_ce_packet(udp_lite_profile,udp_lite,dest,context); |
| 955 |
|
|
if(send_ce_packet){ |
| 956 |
|
|
rohc_debugf(2,"Sending ce-packet..\n"); |
| 957 |
|
|
// 2* |
| 958 |
|
|
dest[first_position] = (0xf8 | udp_lite_profile->FK); |
| 959 |
|
|
//Now the first_position will be on counter current position |
| 960 |
|
|
//and counter must be increased |
| 961 |
|
|
first_position = counter; |
| 962 |
|
|
counter++; |
| 963 |
|
|
} |
| 964 |
|
|
else{ |
| 965 |
|
|
rohc_debugf(2,"Not ce-packet..\n"); |
| 966 |
|
|
} |
| 967 |
|
|
|
| 968 |
|
|
|
| 969 |
|
|
switch(udp_lite_profile->tmp_variables.packet_type){ |
| 970 |
|
|
case c_UO0: |
| 971 |
|
|
rohc_debugf(2,"udp_lite_code_packet(): OU-0 packet..\n"); |
| 972 |
|
|
counter = udp_lite_code_UO0_packet(context, ip, dest, |
| 973 |
|
|
counter,first_position); |
| 974 |
|
|
break; |
| 975 |
|
|
case c_UO1: |
| 976 |
|
|
rohc_debugf(2,"udp_lite_code_packet(): OU-1 packet..\n"); |
| 977 |
|
|
counter = udp_lite_code_UO1_packet(context, ip, dest, |
| 978 |
|
|
counter,first_position); |
| 979 |
|
|
break; |
| 980 |
|
|
|
| 981 |
|
|
case c_UO2: |
| 982 |
|
|
rohc_debugf(2,"udp_lite_code_packet(): OU-2 packet..\n"); |
| 983 |
|
|
counter = udp_lite_code_UO2_packet(context,udp_lite_profile,ip,ip2,dest,counter,first_position); |
| 984 |
|
|
break; |
| 985 |
|
|
default: |
| 986 |
|
|
rohc_debugf(0,"udp_lite_code_packet(): Unknown packet..\n"); |
| 987 |
|
|
return -1; |
| 988 |
|
|
} |
| 989 |
|
|
rohc_debugf(2,"RND=%d RND2=%d\n",context->rnd, context->rnd2); |
| 990 |
|
|
|
| 991 |
|
|
// 10 |
| 992 |
|
|
if(context->rnd == 1){ |
| 993 |
|
|
memcpy(&dest[counter], &ip->id, 2); |
| 994 |
|
|
counter += 2; |
| 995 |
|
|
} |
| 996 |
|
|
|
| 997 |
|
|
// 7 |
| 998 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 999 |
|
|
if(context->rnd2 == 1){ |
| 1000 |
|
|
memcpy(&dest[counter], &ip2->id, 2); |
| 1001 |
|
|
counter += 2; |
| 1002 |
|
|
} |
| 1003 |
|
|
} |
| 1004 |
|
|
rohc_debugf(2,"cfp value: %d..\n", udp_lite_profile->cfp); |
| 1005 |
|
|
// 14 |
| 1006 |
|
|
if((udp_lite_profile->cfp == 1) || send_ce_packet){ |
| 1007 |
|
|
memcpy(&dest[counter], &udp_lite->len, 2); |
| 1008 |
|
|
|
| 1009 |
|
|
counter += 2; |
| 1010 |
|
|
} |
| 1011 |
|
|
|
| 1012 |
|
|
// 15 |
| 1013 |
|
|
memcpy(&dest[counter], &udp_lite->check, 2); |
| 1014 |
|
|
counter += 2; |
| 1015 |
|
|
|
| 1016 |
|
|
|
| 1017 |
|
|
return counter; |
| 1018 |
|
|
|
| 1019 |
|
|
} |
| 1020 |
|
|
|
| 1021 |
|
|
|
| 1022 |
|
|
|
| 1023 |
|
|
/* |
| 1024 |
|
|
Code the IR-packet to this pattern: |
| 1025 |
|
|
|
| 1026 |
|
|
IR packet (5.7.7.1): |
| 1027 |
|
|
|
| 1028 |
|
|
0 1 2 3 4 5 6 7 |
| 1029 |
|
|
--- --- --- --- --- --- --- --- |
| 1030 |
|
|
1 | Add-CID octet | if for small CIDs and CID != 0 |
| 1031 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1032 |
|
|
2 | 1 1 1 1 1 1 0 | D | |
| 1033 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1034 |
|
|
| | |
| 1035 |
|
|
3 / 0-2 octets of CID info / 1-2 octets if for large CIDs |
| 1036 |
|
|
| | |
| 1037 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1038 |
|
|
4 | Profile | 1 octet |
| 1039 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1040 |
|
|
5 | CRC | 1 octet |
| 1041 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1042 |
|
|
| | |
| 1043 |
|
|
6 | Static chain | variable length |
| 1044 |
|
|
| | |
| 1045 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1046 |
|
|
| | |
| 1047 |
|
|
7 | Dynamic chain | present if D = 1, variable length |
| 1048 |
|
|
| | |
| 1049 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1050 |
|
|
| | |
| 1051 |
|
|
| Payload | variable length |
| 1052 |
|
|
| | |
| 1053 |
|
|
- - - - - - - - - - - - - - - - |
| 1054 |
|
|
|
| 1055 |
|
|
The numbers before every field is used to find where in the code we try |
| 1056 |
|
|
to code that field. |
| 1057 |
|
|
*/ |
| 1058 |
|
|
int udp_lite_code_IR_packet(struct sc_udp_lite_context *udp_lite_profile, |
| 1059 |
|
|
const struct iphdr *ip, |
| 1060 |
|
|
const struct iphdr *ip2, |
| 1061 |
|
|
const struct udphdr *udp_lite, |
| 1062 |
|
|
unsigned char *dest, |
| 1063 |
|
|
struct sc_context *context, |
| 1064 |
|
|
int counter, |
| 1065 |
|
|
int first_position) |
| 1066 |
|
|
|
| 1067 |
|
|
{ |
| 1068 |
|
|
unsigned char type; |
| 1069 |
|
|
int crc_position; |
| 1070 |
|
|
|
| 1071 |
|
|
|
| 1072 |
|
|
udp_lite_initiate_coverage_context(udp_lite_profile,udp_lite,dest,context); |
| 1073 |
|
|
|
| 1074 |
|
|
rohc_debugf(2,"Coding IR packet (cid=%d)\n", context->cid); |
| 1075 |
|
|
|
| 1076 |
|
|
// 2 |
| 1077 |
|
|
type = 0xfc; |
| 1078 |
|
|
//Always sends dynamic |
| 1079 |
|
|
type += 1; |
| 1080 |
|
|
|
| 1081 |
|
|
|
| 1082 |
|
|
dest[first_position] = type; |
| 1083 |
|
|
// if large cid |
| 1084 |
|
|
// Set profile_id and crc to zero so far |
| 1085 |
|
|
// 3 |
| 1086 |
|
|
dest[counter] = context -> profile_id; |
| 1087 |
|
|
counter++; |
| 1088 |
|
|
|
| 1089 |
|
|
// 5 |
| 1090 |
|
|
// Becuase we calculate the crc over the ir packet with the crc field set to zero |
| 1091 |
|
|
// The real crc is calculated in the end of this function |
| 1092 |
|
|
crc_position = counter; |
| 1093 |
|
|
dest[counter] = 0; |
| 1094 |
|
|
counter++; |
| 1095 |
|
|
|
| 1096 |
|
|
// 6 |
| 1097 |
|
|
counter = udp_lite_code_static_part(context,&udp_lite_profile->ip_flags,ip,dest, counter); |
| 1098 |
|
|
|
| 1099 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 1100 |
|
|
counter = udp_lite_code_static_part(context,&udp_lite_profile->ip2_flags,ip2,dest,counter); |
| 1101 |
|
|
} |
| 1102 |
|
|
if(counter < 0) |
| 1103 |
|
|
return -1; |
| 1104 |
|
|
counter = udp_lite_code_static_udp_part(context,udp_lite,dest,counter); |
| 1105 |
|
|
|
| 1106 |
|
|
// Add the dynamic part |
| 1107 |
|
|
// Set type of service, time to live id, and some small flags |
| 1108 |
|
|
//if(udp_lite_changed_dynamic_both_hdr(changed_fields,context) > 0){ |
| 1109 |
|
|
//rohc_debugf(1,"Crc length=%d\n", counter); |
| 1110 |
|
|
|
| 1111 |
|
|
|
| 1112 |
|
|
// 7 |
| 1113 |
|
|
|
| 1114 |
|
|
//Observe that if we don't wan't dynamic part in ir-packet we should not send the following |
| 1115 |
|
|
//****************************************************************************************************** |
| 1116 |
|
|
counter = udp_lite_code_dynamic_part(context,&udp_lite_profile->ip_flags,ip,dest,counter,&context->rnd,&context->nbo); |
| 1117 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 1118 |
|
|
counter = udp_lite_code_dynamic_part(context,&udp_lite_profile->ip2_flags,ip2,dest,counter,&context->rnd2,&context->nbo2); |
| 1119 |
|
|
} |
| 1120 |
|
|
if(counter < 0) |
| 1121 |
|
|
return -1; |
| 1122 |
|
|
counter = udp_lite_code_dynamic_udp_part(context,udp_lite,dest,counter); |
| 1123 |
|
|
//****************************************************************************************************** |
| 1124 |
|
|
|
| 1125 |
|
|
|
| 1126 |
|
|
//} |
| 1127 |
|
|
|
| 1128 |
|
|
// 5 Count the crc and set the crc field to the checksum. |
| 1129 |
|
|
rohc_debugf(2,"Crc length=%d\n", counter); |
| 1130 |
|
|
dest[crc_position]= crc_calculate(CRC_TYPE_8,dest,counter); |
| 1131 |
|
|
return counter; |
| 1132 |
|
|
|
| 1133 |
|
|
} |
| 1134 |
|
|
/* |
| 1135 |
|
|
Code the IRDYN-packet to this pattern: |
| 1136 |
|
|
|
| 1137 |
|
|
IR-dyn packet (5.7.7.2): |
| 1138 |
|
|
|
| 1139 |
|
|
0 1 2 3 4 5 6 7 |
| 1140 |
|
|
--- --- --- --- --- --- --- --- |
| 1141 |
|
|
1 : Add-CID octet : if for small CIDs and CID != 0 |
| 1142 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1143 |
|
|
2 | 1 1 1 1 1 0 0 0 | IR-DYN packet type |
| 1144 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1145 |
|
|
: : |
| 1146 |
|
|
3 / 0-2 octets of CID info / 1-2 octets if for large CIDs |
| 1147 |
|
|
: : |
| 1148 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1149 |
|
|
4 | Profile | 1 octet |
| 1150 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1151 |
|
|
5 | CRC | 1 octet |
| 1152 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1153 |
|
|
| | |
| 1154 |
|
|
6 / Dynamic chain / variable length |
| 1155 |
|
|
| | |
| 1156 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1157 |
|
|
: : |
| 1158 |
|
|
/ Payload / variable length |
| 1159 |
|
|
: : |
| 1160 |
|
|
- - - - - - - - - - - - - - - - |
| 1161 |
|
|
|
| 1162 |
|
|
|
| 1163 |
|
|
The numbers before every field is used to find where in the code we try |
| 1164 |
|
|
to code that field. |
| 1165 |
|
|
|
| 1166 |
|
|
*/ |
| 1167 |
|
|
int udp_lite_code_IR_DYN_packet(struct sc_udp_lite_context *udp_lite_profile, |
| 1168 |
|
|
const struct iphdr *ip, |
| 1169 |
|
|
const struct iphdr *ip2, |
| 1170 |
|
|
const struct udphdr *udp_lite, |
| 1171 |
|
|
unsigned char *dest, |
| 1172 |
|
|
struct sc_context *context, |
| 1173 |
|
|
int counter, |
| 1174 |
|
|
int first_position) |
| 1175 |
|
|
{ |
| 1176 |
|
|
int crc_position; |
| 1177 |
|
|
udp_lite_initiate_coverage_context(udp_lite_profile,udp_lite,dest,context); |
| 1178 |
|
|
// 2 |
| 1179 |
|
|
dest[first_position] = 0xf8; |
| 1180 |
|
|
|
| 1181 |
|
|
// 4 |
| 1182 |
|
|
dest[counter] = context -> profile_id; |
| 1183 |
|
|
counter++; |
| 1184 |
|
|
|
| 1185 |
|
|
// 5 |
| 1186 |
|
|
// Becuase we calculate the crc over the ir packet with the crc field set to zero |
| 1187 |
|
|
// The real crc is calculated in the end of this function |
| 1188 |
|
|
crc_position = counter; |
| 1189 |
|
|
dest[counter] = 0; |
| 1190 |
|
|
counter++; |
| 1191 |
|
|
|
| 1192 |
|
|
// 6 |
| 1193 |
|
|
counter = udp_lite_code_dynamic_part(context,&udp_lite_profile->ip_flags,ip,dest,counter,&context->rnd,&context->nbo); |
| 1194 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 1195 |
|
|
counter = udp_lite_code_dynamic_part(context,&udp_lite_profile->ip2_flags,ip2,dest,counter,&context->rnd2,&context->nbo2); |
| 1196 |
|
|
} |
| 1197 |
|
|
if(counter < 0) |
| 1198 |
|
|
return -1; |
| 1199 |
|
|
counter = udp_lite_code_dynamic_udp_part(context,udp_lite,dest,counter); |
| 1200 |
|
|
|
| 1201 |
|
|
// 5 |
| 1202 |
|
|
// Count the crc and set the crc field to the checksum. |
| 1203 |
|
|
dest[crc_position]= crc_calculate(CRC_TYPE_8,dest,counter); |
| 1204 |
|
|
return counter; |
| 1205 |
|
|
} |
| 1206 |
|
|
|
| 1207 |
|
|
|
| 1208 |
|
|
|
| 1209 |
|
|
|
| 1210 |
|
|
/* |
| 1211 |
|
|
Code the static part: |
| 1212 |
|
|
Static part IPv4 (5.7.7.4): |
| 1213 |
|
|
|
| 1214 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1215 |
|
|
1 | Version = 4 | 0 | |
| 1216 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1217 |
|
|
2 | Protocol | |
| 1218 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1219 |
|
|
3 / Source Address / 4 octets |
| 1220 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1221 |
|
|
4 / Destination Address / 4 octets |
| 1222 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1223 |
|
|
*/ |
| 1224 |
|
|
int udp_lite_code_static_part(struct sc_context *context, |
| 1225 |
|
|
struct sc_udp_lite_header *ip_hdr_profile, |
| 1226 |
|
|
const struct iphdr *ip, |
| 1227 |
|
|
unsigned char *dest, |
| 1228 |
|
|
int counter) |
| 1229 |
|
|
{ |
| 1230 |
|
|
|
| 1231 |
|
|
// 1 |
| 1232 |
|
|
dest[counter] = 0x40; |
| 1233 |
|
|
counter++; |
| 1234 |
|
|
|
| 1235 |
|
|
// 2 |
| 1236 |
|
|
dest[counter] = ip -> protocol; rohc_debugf(3,"code_IR, protocol=%d\n", dest[counter]); |
| 1237 |
|
|
counter++; |
| 1238 |
|
|
ip_hdr_profile -> protocol_count++; |
| 1239 |
|
|
|
| 1240 |
|
|
// 3 |
| 1241 |
|
|
memcpy(&dest[counter], &ip -> saddr, 4); |
| 1242 |
|
|
counter += 4; |
| 1243 |
|
|
|
| 1244 |
|
|
// 4 |
| 1245 |
|
|
memcpy(&dest[counter], &ip -> daddr, 4); |
| 1246 |
|
|
counter += 4; |
| 1247 |
|
|
return counter; |
| 1248 |
|
|
} |
| 1249 |
|
|
|
| 1250 |
|
|
/* |
| 1251 |
|
|
Static part of udp_lite header (5.7.7.5): |
| 1252 |
|
|
|
| 1253 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1254 |
|
|
1 / Source Port / 2 octets |
| 1255 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1256 |
|
|
2 / Destination Port / 2 octets |
| 1257 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1258 |
|
|
*/ |
| 1259 |
|
|
int udp_lite_code_static_udp_part(struct sc_context *context, |
| 1260 |
|
|
const struct udphdr *udp_lite, |
| 1261 |
|
|
unsigned char *dest, |
| 1262 |
|
|
int counter) |
| 1263 |
|
|
{ |
| 1264 |
|
|
// 1 |
| 1265 |
|
|
memcpy(&dest[counter], &udp_lite->source, 2); |
| 1266 |
|
|
counter += 2; |
| 1267 |
|
|
|
| 1268 |
|
|
// 2 |
| 1269 |
|
|
memcpy(&dest[counter], &udp_lite->dest, 2); |
| 1270 |
|
|
counter += 2; |
| 1271 |
|
|
|
| 1272 |
|
|
return counter; |
| 1273 |
|
|
} |
| 1274 |
|
|
|
| 1275 |
|
|
/* |
| 1276 |
|
|
Code the dynamic part: |
| 1277 |
|
|
Dynamic part IPv4 (5.7.7.4): |
| 1278 |
|
|
|
| 1279 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1280 |
|
|
1 | Type of Service | |
| 1281 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1282 |
|
|
2 | Time to Live | |
| 1283 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1284 |
|
|
3 / Identification / 2 octets |
| 1285 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1286 |
|
|
4 | DF|RND|NBO| 0 | |
| 1287 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1288 |
|
|
5 / Generic extension header list / variable length |
| 1289 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1290 |
|
|
*/ |
| 1291 |
|
|
int udp_lite_code_dynamic_part(struct sc_context *context, |
| 1292 |
|
|
struct sc_udp_lite_header *ip_hdr_profile, |
| 1293 |
|
|
const struct iphdr *ip, |
| 1294 |
|
|
unsigned char *dest, |
| 1295 |
|
|
int counter, |
| 1296 |
|
|
int *rnd, |
| 1297 |
|
|
int *nbo) |
| 1298 |
|
|
{ |
| 1299 |
|
|
|
| 1300 |
|
|
unsigned char df_rnd_nbo = 0; |
| 1301 |
|
|
int reserved, dont_fragment, more_fragments, fragment_offset; |
| 1302 |
|
|
unsigned short fragment; |
| 1303 |
|
|
|
| 1304 |
|
|
// 1 |
| 1305 |
|
|
dest[counter] = ip -> tos; |
| 1306 |
|
|
counter++; |
| 1307 |
|
|
ip_hdr_profile->tos_count++; |
| 1308 |
|
|
|
| 1309 |
|
|
// 2 |
| 1310 |
|
|
dest[counter] = ip -> ttl; |
| 1311 |
|
|
counter++; |
| 1312 |
|
|
ip_hdr_profile->ttl_count++; |
| 1313 |
|
|
|
| 1314 |
|
|
// 3 |
| 1315 |
|
|
memcpy(&dest[counter], &ip->id, 2); |
| 1316 |
|
|
counter += 2; |
| 1317 |
|
|
|
| 1318 |
|
|
// 4 |
| 1319 |
|
|
fragment = ntohs(ip->frag_off); |
| 1320 |
|
|
|
| 1321 |
|
|
reserved = (fragment >> 15); |
| 1322 |
|
|
dont_fragment = (fragment >> 14) & 1; |
| 1323 |
|
|
more_fragments = (fragment >> 13) & 1; |
| 1324 |
|
|
fragment_offset = fragment & ((1<<14)-1); |
| 1325 |
|
|
if(reserved != 0 || more_fragments != 0 || fragment_offset != 0) { |
| 1326 |
|
|
rohc_debugf(0,"Fragment error (%d, %d, %d, %d)\n", reserved, dont_fragment, more_fragments, fragment_offset); |
| 1327 |
|
|
return -1; |
| 1328 |
|
|
} |
| 1329 |
|
|
df_rnd_nbo = (dont_fragment << 7); |
| 1330 |
|
|
ip_hdr_profile->df_count++; |
| 1331 |
|
|
// Check random flags and network byte order flag in the context struct |
| 1332 |
|
|
if(*rnd){ |
| 1333 |
|
|
df_rnd_nbo |= 0x40; |
| 1334 |
|
|
} |
| 1335 |
|
|
if(*nbo){ |
| 1336 |
|
|
df_rnd_nbo |= 0x20; |
| 1337 |
|
|
} |
| 1338 |
|
|
ip_hdr_profile->rnd_count++; |
| 1339 |
|
|
ip_hdr_profile->nbo_count++; |
| 1340 |
|
|
dest[counter] = df_rnd_nbo; |
| 1341 |
|
|
counter++; |
| 1342 |
|
|
|
| 1343 |
|
|
// 5 is not supported |
| 1344 |
|
|
|
| 1345 |
|
|
return counter; |
| 1346 |
|
|
} |
| 1347 |
|
|
|
| 1348 |
|
|
/* |
| 1349 |
|
|
Dynamic part of udp_lite header (5.7.7.5): |
| 1350 |
|
|
|
| 1351 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1352 |
|
|
1 / Checksum Coverage / 2 octets |
| 1353 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1354 |
|
|
2 / Checksum / 2 octets |
| 1355 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1356 |
|
|
3 | SN | 2 octets |
| 1357 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1358 |
|
|
*/ |
| 1359 |
|
|
int udp_lite_code_dynamic_udp_part(struct sc_context *context, |
| 1360 |
|
|
const struct udphdr *udp_lite, |
| 1361 |
|
|
unsigned char *dest, |
| 1362 |
|
|
int counter) |
| 1363 |
|
|
{ |
| 1364 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 1365 |
|
|
|
| 1366 |
|
|
// 1 |
| 1367 |
|
|
|
| 1368 |
|
|
memcpy(&dest[counter], &udp_lite->len,2); |
| 1369 |
|
|
counter += 2; |
| 1370 |
|
|
|
| 1371 |
|
|
|
| 1372 |
|
|
// 2 |
| 1373 |
|
|
memcpy(&dest[counter], &udp_lite->check, 2); |
| 1374 |
|
|
counter += 2; |
| 1375 |
|
|
|
| 1376 |
|
|
|
| 1377 |
|
|
// 3 |
| 1378 |
|
|
dest[counter] = (udp_lite_profile->sn) >> 8; |
| 1379 |
|
|
counter++; |
| 1380 |
|
|
dest[counter] = (udp_lite_profile->sn) & 0xff; |
| 1381 |
|
|
counter++; |
| 1382 |
|
|
return counter; |
| 1383 |
|
|
} |
| 1384 |
|
|
/* |
| 1385 |
|
|
Code UO0-packets according to the following pattern: |
| 1386 |
|
|
|
| 1387 |
|
|
0 1 2 3 4 5 6 7 |
| 1388 |
|
|
--- --- --- --- --- --- --- --- |
| 1389 |
|
|
1 : Add-CID octet : |
| 1390 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1391 |
|
|
2 | 1 1 1 1 1 0 F K | Outer packet type identifier |
| 1392 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1393 |
|
|
: : |
| 1394 |
|
|
3 / 0, 1, or 2 octets of CID / |
| 1395 |
|
|
: : |
| 1396 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1397 |
|
|
|
| 1398 |
|
|
UO-0 (5.7.1) |
| 1399 |
|
|
|
| 1400 |
|
|
0 1 2 3 4 5 6 7 |
| 1401 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1402 |
|
|
4 | 0 | SN | CRC | |
| 1403 |
|
|
+===+===+===+===+===+===+===+===+ |
| 1404 |
|
|
*/ |
| 1405 |
|
|
|
| 1406 |
|
|
int udp_lite_code_UO0_packet(struct sc_context *context, |
| 1407 |
|
|
const struct iphdr *ip, |
| 1408 |
|
|
unsigned char *dest, |
| 1409 |
|
|
int counter, |
| 1410 |
|
|
int first_position) |
| 1411 |
|
|
{ |
| 1412 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 1413 |
|
|
unsigned char f_byte; |
| 1414 |
|
|
|
| 1415 |
|
|
|
| 1416 |
|
|
int ch_sum; |
| 1417 |
|
|
|
| 1418 |
|
|
|
| 1419 |
|
|
// 4 |
| 1420 |
|
|
f_byte = (udp_lite_profile -> sn) & 0xf; |
| 1421 |
|
|
f_byte = f_byte << 3; |
| 1422 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr == 1) |
| 1423 |
|
|
ch_sum= crc_calculate(CRC_TYPE_3,(unsigned char *)ip,sizeof(struct iphdr)+sizeof(struct udphdr)); |
| 1424 |
|
|
else |
| 1425 |
|
|
ch_sum= crc_calculate(CRC_TYPE_3,(unsigned char *)ip,2*sizeof(struct iphdr)+sizeof(struct udphdr)); |
| 1426 |
|
|
f_byte = f_byte + ch_sum; |
| 1427 |
|
|
dest[first_position] = f_byte; |
| 1428 |
|
|
return counter; |
| 1429 |
|
|
} |
| 1430 |
|
|
|
| 1431 |
|
|
/* |
| 1432 |
|
|
Code UO1-packets acording to the following pattern: |
| 1433 |
|
|
|
| 1434 |
|
|
0 1 2 3 4 5 6 7 |
| 1435 |
|
|
--- --- --- --- --- --- --- --- |
| 1436 |
|
|
1 : Add-CID octet : |
| 1437 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1438 |
|
|
2 | first octet of base header | |
| 1439 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1440 |
|
|
: : |
| 1441 |
|
|
3 / 0, 1, or 2 octets of CID / |
| 1442 |
|
|
: : |
| 1443 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1444 |
|
|
|
| 1445 |
|
|
OU-1 (5.11.3) |
| 1446 |
|
|
|
| 1447 |
|
|
0 1 2 3 4 5 6 7 |
| 1448 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1449 |
|
|
2 | 1 0 | IP-ID | |
| 1450 |
|
|
+===+===+===+===+===+===+===+===+ |
| 1451 |
|
|
4 | SN | CRC | |
| 1452 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1453 |
|
|
|
| 1454 |
|
|
*/ |
| 1455 |
|
|
int udp_lite_code_UO1_packet(struct sc_context *context, |
| 1456 |
|
|
const struct iphdr *ip, |
| 1457 |
|
|
unsigned char *dest, |
| 1458 |
|
|
int counter, |
| 1459 |
|
|
int first_position) |
| 1460 |
|
|
{ |
| 1461 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 1462 |
|
|
unsigned char f_byte; |
| 1463 |
|
|
unsigned char s_byte; |
| 1464 |
|
|
|
| 1465 |
|
|
int ch_sum; |
| 1466 |
|
|
|
| 1467 |
|
|
f_byte = (udp_lite_profile -> ip_flags.id_delta) & 0x3f; |
| 1468 |
|
|
f_byte |= 0x80; |
| 1469 |
|
|
// Add the 5 bits of sn |
| 1470 |
|
|
s_byte = (udp_lite_profile -> sn) & 0x1f; |
| 1471 |
|
|
s_byte = s_byte << 3; |
| 1472 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr == 1) |
| 1473 |
|
|
ch_sum= crc_calculate(CRC_TYPE_3,(unsigned char *)ip,sizeof(struct iphdr)+sizeof(struct udphdr)); |
| 1474 |
|
|
else |
| 1475 |
|
|
ch_sum= crc_calculate(CRC_TYPE_3,(unsigned char *)ip,2*sizeof(struct iphdr)+sizeof(struct udphdr)); |
| 1476 |
|
|
s_byte |= ch_sum; |
| 1477 |
|
|
dest[first_position] = f_byte; |
| 1478 |
|
|
dest[counter] = s_byte; |
| 1479 |
|
|
counter++; |
| 1480 |
|
|
return counter; |
| 1481 |
|
|
} |
| 1482 |
|
|
|
| 1483 |
|
|
/* |
| 1484 |
|
|
Code UO0-packets acording to the following pattern: |
| 1485 |
|
|
|
| 1486 |
|
|
0 1 2 3 4 5 6 7 |
| 1487 |
|
|
--- --- --- --- --- --- --- --- |
| 1488 |
|
|
1 : Add-CID octet : |
| 1489 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1490 |
|
|
2 | first octet of base header | |
| 1491 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1492 |
|
|
: : |
| 1493 |
|
|
3 / 0, 1, or 2 octets of CID / |
| 1494 |
|
|
: : |
| 1495 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1496 |
|
|
|
| 1497 |
|
|
OU-2 (5.11.3): |
| 1498 |
|
|
|
| 1499 |
|
|
0 1 2 3 4 5 6 7 |
| 1500 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1501 |
|
|
2 | 1 1 0 | SN | |
| 1502 |
|
|
+===+===+===+===+===+===+===+===+ |
| 1503 |
|
|
4 | X | CRC | |
| 1504 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1505 |
|
|
|
| 1506 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1507 |
|
|
: : |
| 1508 |
|
|
5 / Extension / |
| 1509 |
|
|
: : |
| 1510 |
|
|
--- --- --- --- --- --- --- --- |
| 1511 |
|
|
*/ |
| 1512 |
|
|
int udp_lite_code_UO2_packet(struct sc_context *context, |
| 1513 |
|
|
struct sc_udp_lite_context *udp_lite_profile, |
| 1514 |
|
|
const struct iphdr *ip, |
| 1515 |
|
|
const struct iphdr *ip2, |
| 1516 |
|
|
unsigned char *dest, |
| 1517 |
|
|
int counter, |
| 1518 |
|
|
int first_position) |
| 1519 |
|
|
{ |
| 1520 |
|
|
|
| 1521 |
|
|
unsigned char f_byte; |
| 1522 |
|
|
unsigned char s_byte; |
| 1523 |
|
|
int ch_sum; |
| 1524 |
|
|
int extension; |
| 1525 |
|
|
|
| 1526 |
|
|
// 2 |
| 1527 |
|
|
f_byte = 0xc0; |
| 1528 |
|
|
// Add the 4 bits of sn |
| 1529 |
|
|
|
| 1530 |
|
|
// 4 |
| 1531 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr == 1) |
| 1532 |
|
|
ch_sum= crc_calculate(CRC_TYPE_7,(unsigned char *)ip,sizeof(struct iphdr)+sizeof(struct udphdr)); |
| 1533 |
|
|
else |
| 1534 |
|
|
ch_sum= crc_calculate(CRC_TYPE_7,(unsigned char *)ip,2*sizeof(struct iphdr)+sizeof(struct udphdr)); |
| 1535 |
|
|
s_byte = ch_sum; |
| 1536 |
|
|
|
| 1537 |
|
|
// 5 |
| 1538 |
|
|
extension = udp_lite_decide_extension(context); |
| 1539 |
|
|
if(extension == c_NOEXT){ |
| 1540 |
|
|
rohc_debugf(1,"code_OU2_packet(): no extension\n"); |
| 1541 |
|
|
// 2 |
| 1542 |
|
|
f_byte |= ((udp_lite_profile -> sn) & 0x1f); |
| 1543 |
|
|
dest[first_position] = f_byte; |
| 1544 |
|
|
// 4 |
| 1545 |
|
|
dest[counter] = s_byte; |
| 1546 |
|
|
counter++; |
| 1547 |
|
|
return counter; |
| 1548 |
|
|
} |
| 1549 |
|
|
// 4 |
| 1550 |
|
|
//We have a extension |
| 1551 |
|
|
s_byte |= 0x80; |
| 1552 |
|
|
dest[counter] = s_byte; |
| 1553 |
|
|
counter++; |
| 1554 |
|
|
|
| 1555 |
|
|
// 5 |
| 1556 |
|
|
if(extension == c_EXT0) { |
| 1557 |
|
|
rohc_debugf(1,"code_OU2_packet(): using extension 0\n"); |
| 1558 |
|
|
// 2 |
| 1559 |
|
|
f_byte |= ((udp_lite_profile -> sn & 0xff) >> 3); |
| 1560 |
|
|
dest[first_position] = f_byte; |
| 1561 |
|
|
// 5 |
| 1562 |
|
|
counter = udp_lite_code_EXT0_packet(context,ip,dest,counter); |
| 1563 |
|
|
} else if(extension == c_EXT1) { |
| 1564 |
|
|
rohc_debugf(1,"code_OU2_packet(): using extension 1\n"); |
| 1565 |
|
|
// 2 |
| 1566 |
|
|
f_byte |= ((udp_lite_profile -> sn & 0xff) >> 3); |
| 1567 |
|
|
dest[first_position] = f_byte; |
| 1568 |
|
|
// 5 |
| 1569 |
|
|
counter = udp_lite_code_EXT1_packet(context,ip,dest,counter); |
| 1570 |
|
|
} else if(extension == c_EXT2){ |
| 1571 |
|
|
rohc_debugf(1,"code_OU2_packet(): using extension 2\n"); |
| 1572 |
|
|
// 2 |
| 1573 |
|
|
f_byte |= ((udp_lite_profile -> sn & 0xff) >> 3); |
| 1574 |
|
|
dest[first_position] = f_byte; |
| 1575 |
|
|
// 5 |
| 1576 |
|
|
counter = udp_lite_code_EXT2_packet(context,udp_lite_profile,ip,dest,counter); |
| 1577 |
|
|
} |
| 1578 |
|
|
else if(extension == c_EXT3) { |
| 1579 |
|
|
rohc_debugf(1,"code_OU2_packet(): using extension 3\n"); |
| 1580 |
|
|
// 2 |
| 1581 |
|
|
// check if s-field needs to be used |
| 1582 |
|
|
if(udp_lite_profile->tmp_variables.nr_sn_bits > 5) |
| 1583 |
|
|
f_byte |= ((udp_lite_profile -> sn) >> 8); |
| 1584 |
|
|
else |
| 1585 |
|
|
f_byte |= (udp_lite_profile -> sn & 0x1f); |
| 1586 |
|
|
|
| 1587 |
|
|
dest[first_position] = f_byte; |
| 1588 |
|
|
// 5 |
| 1589 |
|
|
counter = udp_lite_code_EXT3_packet(context,udp_lite_profile,ip,ip2,dest,counter); |
| 1590 |
|
|
} else { |
| 1591 |
|
|
rohc_debugf(0,"code_OU2_packet(): Unknown extension (%d)..\n", extension); |
| 1592 |
|
|
|
| 1593 |
|
|
} |
| 1594 |
|
|
return counter; |
| 1595 |
|
|
} |
| 1596 |
|
|
|
| 1597 |
|
|
|
| 1598 |
|
|
/* |
| 1599 |
|
|
Coding the extension 0 part of the uo0-packet |
| 1600 |
|
|
|
| 1601 |
|
|
Extension 0 (5.11.4): |
| 1602 |
|
|
|
| 1603 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1604 |
|
|
1 | 0 0 | SN | IP-ID | |
| 1605 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1606 |
|
|
|
| 1607 |
|
|
*/ |
| 1608 |
|
|
int udp_lite_code_EXT0_packet(struct sc_context *context,const struct iphdr *ip, |
| 1609 |
|
|
unsigned char *dest, int counter) |
| 1610 |
|
|
{ |
| 1611 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 1612 |
|
|
unsigned char f_byte; |
| 1613 |
|
|
|
| 1614 |
|
|
// 1 |
| 1615 |
|
|
f_byte = (udp_lite_profile -> sn) & 0x07; |
| 1616 |
|
|
f_byte = f_byte << 3; |
| 1617 |
|
|
f_byte |= (udp_lite_profile ->ip_flags. id_delta) & 0x07; |
| 1618 |
|
|
dest[counter] = f_byte; |
| 1619 |
|
|
counter++; |
| 1620 |
|
|
return counter; |
| 1621 |
|
|
|
| 1622 |
|
|
} |
| 1623 |
|
|
/* |
| 1624 |
|
|
Coding the extension 1 part of the uo1-packet |
| 1625 |
|
|
|
| 1626 |
|
|
Extension 1 (5.11.4): |
| 1627 |
|
|
|
| 1628 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1629 |
|
|
1 | 0 1 | SN | IP-ID | |
| 1630 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1631 |
|
|
2 | IP-ID | |
| 1632 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1633 |
|
|
*/ |
| 1634 |
|
|
int udp_lite_code_EXT1_packet(struct sc_context *context, |
| 1635 |
|
|
const struct iphdr *ip, |
| 1636 |
|
|
unsigned char *dest, |
| 1637 |
|
|
int counter) |
| 1638 |
|
|
{ |
| 1639 |
|
|
//Code for the extension |
| 1640 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 1641 |
|
|
unsigned char f_byte; |
| 1642 |
|
|
unsigned char s_byte; |
| 1643 |
|
|
unsigned short id; |
| 1644 |
|
|
|
| 1645 |
|
|
// 1 |
| 1646 |
|
|
f_byte = (udp_lite_profile -> sn) & 0x07; |
| 1647 |
|
|
f_byte = f_byte << 3; |
| 1648 |
|
|
id = (udp_lite_profile ->ip_flags. id_delta) & 0x0700; |
| 1649 |
|
|
id = id >> 8; |
| 1650 |
|
|
f_byte |= id; |
| 1651 |
|
|
f_byte |= 0x40; |
| 1652 |
|
|
|
| 1653 |
|
|
// 2 |
| 1654 |
|
|
s_byte = (udp_lite_profile ->ip_flags. id_delta) & 0xff; |
| 1655 |
|
|
dest[counter] = f_byte; |
| 1656 |
|
|
counter++; |
| 1657 |
|
|
dest[counter] = s_byte; |
| 1658 |
|
|
counter++; |
| 1659 |
|
|
return counter; |
| 1660 |
|
|
} |
| 1661 |
|
|
|
| 1662 |
|
|
|
| 1663 |
|
|
/* |
| 1664 |
|
|
Coding the extension 1 part of the uo1-packet |
| 1665 |
|
|
|
| 1666 |
|
|
Extension 2 (5.11.4): |
| 1667 |
|
|
|
| 1668 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1669 |
|
|
1 | 1 0 | SN | IP-ID2 | |
| 1670 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1671 |
|
|
2 | IP-ID2 | |
| 1672 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1673 |
|
|
3 | IP-ID | |
| 1674 |
|
|
+---+---+---+---+---+---+---+---+ |
| 1675 |
|
|
|
| 1676 |
|
|
IP-ID2: For outer IP-ID field. |
| 1677 |
|
|
*/ |
| 1678 |
|
|
int udp_lite_code_EXT2_packet(struct sc_context *context, |
| 1679 |
|
|
struct sc_udp_lite_context *udp_lite_profile, |
| 1680 |
|
|
const struct iphdr *ip, |
| 1681 |
|
|
unsigned char *dest, |
| 1682 |
|
|
int counter) |
| 1683 |
|
|
{ |
| 1684 |
|
|
//Code for the extension |
| 1685 |
|
|
|
| 1686 |
|
|
unsigned char f_byte; |
| 1687 |
|
|
unsigned char s_byte; |
| 1688 |
|
|
unsigned short id; |
| 1689 |
|
|
|
| 1690 |
|
|
//its a bit confusing here but ip-id2 in the packet |
| 1691 |
|
|
//description means the first headers ip-id and ip-flags |
| 1692 |
|
|
//mean the first header and ip2-flags means the second |
| 1693 |
|
|
//ip-header |
| 1694 |
|
|
// 1 |
| 1695 |
|
|
f_byte = (udp_lite_profile -> sn) & 0x07; |
| 1696 |
|
|
f_byte = f_byte << 3; |
| 1697 |
|
|
id = (udp_lite_profile->ip_flags.id_delta) & 0x0700; |
| 1698 |
|
|
id = id >> 8; |
| 1699 |
|
|
f_byte |= id; |
| 1700 |
|
|
f_byte |= 0x80; |
| 1701 |
|
|
dest[counter] = f_byte; |
| 1702 |
|
|
counter++; |
| 1703 |
|
|
|
| 1704 |
|
|
// 2 |
| 1705 |
|
|
s_byte = (udp_lite_profile->ip_flags .id_delta) & 0xff; |
| 1706 |
|
|
dest[counter] = s_byte; |
| 1707 |
|
|
counter++; |
| 1708 |
|
|
|
| 1709 |
|
|
// 3 |
| 1710 |
|
|
dest[counter] = (udp_lite_profile ->ip2_flags.id_delta) & 0xff; |
| 1711 |
|
|
counter++; |
| 1712 |
|
|
return counter; |
| 1713 |
|
|
} |
| 1714 |
|
|
|
| 1715 |
|
|
/* |
| 1716 |
|
|
Coding the extension 3 part of the uo2-packet |
| 1717 |
|
|
|
| 1718 |
|
|
Extension 3 (5.7.5 && 5.11.4): |
| 1719 |
|
|
|
| 1720 |
|
|
0 1 2 3 4 5 6 7 |
| 1721 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1722 |
|
|
1 | 1 1 | S | Mode | I | ip | ip2 | |
| 1723 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1724 |
|
|
2 | Inner IP header flags | | if ip = 1 |
| 1725 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1726 |
|
|
3 | Outer IP header flags | |
| 1727 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1728 |
|
|
4 | SN | if S = 1 |
| 1729 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1730 |
|
|
| | |
| 1731 |
|
|
5 / Inner IP header fields / variable, |
| 1732 |
|
|
| | |
| 1733 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1734 |
|
|
6 | IP-ID | 2 octets, if I = 1 |
| 1735 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1736 |
|
|
| | |
| 1737 |
|
|
7 / Outer IP header fields / variable, |
| 1738 |
|
|
| | |
| 1739 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1740 |
|
|
|
| 1741 |
|
|
*/ |
| 1742 |
|
|
int udp_lite_code_EXT3_packet(struct sc_context *context, |
| 1743 |
|
|
struct sc_udp_lite_context *udp_lite_profile, |
| 1744 |
|
|
const struct iphdr *ip, |
| 1745 |
|
|
const struct iphdr *ip2, |
| 1746 |
|
|
unsigned char *dest, |
| 1747 |
|
|
int counter) |
| 1748 |
|
|
{ |
| 1749 |
|
|
//Code for the extension |
| 1750 |
|
|
unsigned char f_byte; |
| 1751 |
|
|
unsigned char changed_fields = udp_lite_profile->tmp_variables.changed_fields; |
| 1752 |
|
|
unsigned char changed_fields2 = udp_lite_profile->tmp_variables.changed_fields2; |
| 1753 |
|
|
int nr_ip_id_bits = udp_lite_profile->tmp_variables.nr_ip_id_bits; |
| 1754 |
|
|
int nr_ip_id_bits2 = udp_lite_profile->tmp_variables.nr_ip_id_bits2; |
| 1755 |
|
|
boolean have_inner = 0; |
| 1756 |
|
|
boolean have_outer = 0; |
| 1757 |
|
|
|
| 1758 |
|
|
// 1 |
| 1759 |
|
|
f_byte = 0xc0; |
| 1760 |
|
|
if(udp_lite_profile->tmp_variables.nr_sn_bits > 5){ |
| 1761 |
|
|
f_byte |= 0x20; |
| 1762 |
|
|
} |
| 1763 |
|
|
|
| 1764 |
|
|
f_byte = f_byte | (context -> c_mode) << 3; |
| 1765 |
|
|
//If random bit is set we have the ip-id field outside this function |
| 1766 |
|
|
rohc_debugf(1,"rnd_count_up: %d \n",udp_lite_profile->ip_flags.rnd_count); |
| 1767 |
|
|
|
| 1768 |
|
|
|
| 1769 |
|
|
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////// |
| 1770 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr == 1){ |
| 1771 |
|
|
if ((nr_ip_id_bits > 0 && (context->rnd == 0))||(udp_lite_profile->ip_flags.rnd_count < MAX_FO_COUNT && context->rnd == 0)){ |
| 1772 |
|
|
f_byte = f_byte | 0x04; |
| 1773 |
|
|
} |
| 1774 |
|
|
if(udp_lite_changed_dynamic_one_hdr(changed_fields,&udp_lite_profile->ip_flags,ip,context->rnd,context->nbo,context) || |
| 1775 |
|
|
udp_lite_changed_static_one_hdr(changed_fields,&udp_lite_profile->ip_flags,ip,context)) |
| 1776 |
|
|
{ |
| 1777 |
|
|
have_inner = 1; |
| 1778 |
|
|
f_byte = f_byte | 0x02; |
| 1779 |
|
|
} |
| 1780 |
|
|
} |
| 1781 |
|
|
else{ |
| 1782 |
|
|
if ((nr_ip_id_bits > 0 && (context->rnd2 == 0))||(udp_lite_profile->ip2_flags.rnd_count < MAX_FO_COUNT && context->rnd2 == 0)){ |
| 1783 |
|
|
f_byte = f_byte | 0x04; |
| 1784 |
|
|
|
| 1785 |
|
|
} |
| 1786 |
|
|
if(udp_lite_changed_dynamic_one_hdr(changed_fields,&udp_lite_profile->ip_flags,ip,context->rnd,context->nbo,context) || |
| 1787 |
|
|
udp_lite_changed_static_one_hdr(changed_fields,&udp_lite_profile->ip_flags,ip,context)) |
| 1788 |
|
|
{ |
| 1789 |
|
|
have_outer = 1; |
| 1790 |
|
|
f_byte = f_byte | 0x01; |
| 1791 |
|
|
} |
| 1792 |
|
|
if(udp_lite_changed_dynamic_one_hdr(changed_fields2,&udp_lite_profile->ip2_flags,ip2,context->rnd2,context->nbo2,context) || |
| 1793 |
|
|
udp_lite_changed_static_one_hdr(changed_fields2,&udp_lite_profile->ip2_flags,ip2,context)) |
| 1794 |
|
|
{ |
| 1795 |
|
|
have_inner = 1; |
| 1796 |
|
|
f_byte = f_byte | 0x02; |
| 1797 |
|
|
} |
| 1798 |
|
|
|
| 1799 |
|
|
} |
| 1800 |
|
|
dest[counter] = f_byte; |
| 1801 |
|
|
counter++; |
| 1802 |
|
|
|
| 1803 |
|
|
|
| 1804 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr == 1){ |
| 1805 |
|
|
// 2 |
| 1806 |
|
|
if(have_inner){ |
| 1807 |
|
|
counter = udp_lite_header_flags(context,changed_fields,&udp_lite_profile->ip_flags,counter,0, |
| 1808 |
|
|
nr_ip_id_bits,ip,dest,context->rnd,context->nbo); |
| 1809 |
|
|
} |
| 1810 |
|
|
// 4 |
| 1811 |
|
|
if(udp_lite_profile->tmp_variables.nr_sn_bits > 5){ |
| 1812 |
|
|
dest[counter] = (udp_lite_profile -> sn) & 0xff; |
| 1813 |
|
|
counter++; |
| 1814 |
|
|
} |
| 1815 |
|
|
// 5 |
| 1816 |
|
|
if(have_inner){ |
| 1817 |
|
|
counter = udp_lite_header_fields(context,changed_fields,&udp_lite_profile->ip_flags,counter,0, |
| 1818 |
|
|
nr_ip_id_bits,ip,dest,context->rnd); |
| 1819 |
|
|
} |
| 1820 |
|
|
//6 |
| 1821 |
|
|
if(((nr_ip_id_bits > 0) && (context->rnd == 0)) || ((udp_lite_profile->ip_flags.rnd_count-1 < MAX_FO_COUNT) && (context->rnd == 0))){ |
| 1822 |
|
|
|
| 1823 |
|
|
memcpy(&dest[counter], &ip->id, 2); |
| 1824 |
|
|
counter+=2; |
| 1825 |
|
|
} |
| 1826 |
|
|
} |
| 1827 |
|
|
else{ |
| 1828 |
|
|
// 2 |
| 1829 |
|
|
if(have_inner){ |
| 1830 |
|
|
counter = udp_lite_header_flags(context,changed_fields2,&udp_lite_profile->ip2_flags,counter,0, |
| 1831 |
|
|
nr_ip_id_bits2,ip2,dest,context->rnd2,context->nbo2); |
| 1832 |
|
|
} |
| 1833 |
|
|
// 3 |
| 1834 |
|
|
if(have_outer){ |
| 1835 |
|
|
counter = udp_lite_header_flags(context,changed_fields,&udp_lite_profile->ip_flags,counter,1, |
| 1836 |
|
|
nr_ip_id_bits,ip,dest,context->rnd,context->nbo); |
| 1837 |
|
|
|
| 1838 |
|
|
} |
| 1839 |
|
|
// 4 |
| 1840 |
|
|
if(udp_lite_profile->tmp_variables.nr_sn_bits > 5){ |
| 1841 |
|
|
dest[counter] = (udp_lite_profile -> sn) & 0xff; |
| 1842 |
|
|
counter++; |
| 1843 |
|
|
} |
| 1844 |
|
|
// 5 |
| 1845 |
|
|
if(have_inner){ |
| 1846 |
|
|
counter = udp_lite_header_fields(context,changed_fields2,&udp_lite_profile->ip2_flags,counter,0, |
| 1847 |
|
|
nr_ip_id_bits2,ip2,dest,context->rnd2); |
| 1848 |
|
|
} |
| 1849 |
|
|
//6 |
| 1850 |
|
|
if(((nr_ip_id_bits2 > 0) && (context->rnd2 == 0)) || ((udp_lite_profile->ip2_flags.rnd_count-1 < MAX_FO_COUNT) && (context->rnd2 == 0))){ |
| 1851 |
|
|
|
| 1852 |
|
|
memcpy(&dest[counter], &ip2->id, 2); |
| 1853 |
|
|
counter+=2; |
| 1854 |
|
|
} |
| 1855 |
|
|
|
| 1856 |
|
|
// 7 |
| 1857 |
|
|
if(have_outer){ |
| 1858 |
|
|
counter = udp_lite_header_fields(context,changed_fields,&udp_lite_profile->ip_flags,counter,1, |
| 1859 |
|
|
nr_ip_id_bits,ip,dest,context->rnd); |
| 1860 |
|
|
} |
| 1861 |
|
|
} |
| 1862 |
|
|
//No ip extension until list compression |
| 1863 |
|
|
return counter; |
| 1864 |
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////// |
| 1865 |
|
|
} |
| 1866 |
|
|
|
| 1867 |
|
|
/* |
| 1868 |
|
|
Function coding header flags: |
| 1869 |
|
|
|
| 1870 |
|
|
For inner flags: |
| 1871 |
|
|
|
| 1872 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1873 |
|
|
1 | Inner IP header flags | | if ip = 1 |
| 1874 |
|
|
| TOS | TTL | DF | PR | IPX | NBO | RND | 0** | 0** reserved |
| 1875 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1876 |
|
|
|
| 1877 |
|
|
|
| 1878 |
|
|
or for outer flags: |
| 1879 |
|
|
|
| 1880 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1881 |
|
|
2 | Outer IP header flags | |
| 1882 |
|
|
| TOS2| TTL2| DF2 | PR2 |IPX2 |NBO2 |RND2 | I2 | if ip2 = 1 |
| 1883 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1884 |
|
|
*/ |
| 1885 |
|
|
int udp_lite_header_flags(struct sc_context *context, |
| 1886 |
|
|
unsigned short changed_fields, |
| 1887 |
|
|
struct sc_udp_lite_header *ip_hdr_profile, |
| 1888 |
|
|
int counter, |
| 1889 |
|
|
boolean is_outer, |
| 1890 |
|
|
int nr_ip_id_bits, |
| 1891 |
|
|
const struct iphdr *ip, |
| 1892 |
|
|
unsigned char *dest, |
| 1893 |
|
|
int context_rnd, |
| 1894 |
|
|
int context_nbo) |
| 1895 |
|
|
{ |
| 1896 |
|
|
int ip_h_f = 0; |
| 1897 |
|
|
|
| 1898 |
|
|
// 1 and 2 |
| 1899 |
|
|
if(udp_lite_is_changed(changed_fields,MOD_TOS) || (ip_hdr_profile->tos_count < MAX_FO_COUNT)){ |
| 1900 |
|
|
ip_h_f |= 0x80; |
| 1901 |
|
|
} |
| 1902 |
|
|
if(udp_lite_is_changed(changed_fields,MOD_TTL) || (ip_hdr_profile->ttl_count < MAX_FO_COUNT)){ |
| 1903 |
|
|
ip_h_f |= 0x40; |
| 1904 |
|
|
} |
| 1905 |
|
|
if(udp_lite_is_changed(changed_fields,MOD_PROTOCOL) || (ip_hdr_profile->protocol_count < MAX_FO_COUNT)){ |
| 1906 |
|
|
ip_h_f |= 0x10; |
| 1907 |
|
|
} |
| 1908 |
|
|
|
| 1909 |
|
|
rohc_debugf(1,"DF=%d\n", GET_DF(ip->frag_off)); |
| 1910 |
|
|
ip_hdr_profile->df_count++; |
| 1911 |
|
|
ip_h_f |= GET_DF(ip->frag_off) << 5; |
| 1912 |
|
|
|
| 1913 |
|
|
ip_hdr_profile->nbo_count++; |
| 1914 |
|
|
ip_h_f |= (context_nbo) << 2; |
| 1915 |
|
|
|
| 1916 |
|
|
ip_hdr_profile->rnd_count++; |
| 1917 |
|
|
ip_h_f |= (context_rnd) << 1; |
| 1918 |
|
|
|
| 1919 |
|
|
// Only 2 |
| 1920 |
|
|
if(is_outer){ |
| 1921 |
|
|
if ((nr_ip_id_bits > 0 && (context_rnd == 0))||(ip_hdr_profile->rnd_count-1 < MAX_FO_COUNT && context_rnd == 0) ){ |
| 1922 |
|
|
ip_h_f |= 0x01; |
| 1923 |
|
|
|
| 1924 |
|
|
} |
| 1925 |
|
|
} |
| 1926 |
|
|
|
| 1927 |
|
|
|
| 1928 |
|
|
// 1 and 2 |
| 1929 |
|
|
dest[counter] = ip_h_f; |
| 1930 |
|
|
counter++; |
| 1931 |
|
|
|
| 1932 |
|
|
return counter; |
| 1933 |
|
|
} |
| 1934 |
|
|
|
| 1935 |
|
|
/* |
| 1936 |
|
|
Function coding header fields: |
| 1937 |
|
|
|
| 1938 |
|
|
For inner fields and outer fields (The function is called two times |
| 1939 |
|
|
one for inner and one for outer with different arguments): |
| 1940 |
|
|
|
| 1941 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1942 |
|
|
1 | Type of Service/Traffic Class | if TOS = 1 |
| 1943 |
|
|
..... ..... ..... ..... ..... ..... ..... ..... |
| 1944 |
|
|
2 | Time to Live/Hop Limit | if TTL = 1 |
| 1945 |
|
|
..... ..... ..... ..... ..... ..... ..... ..... |
| 1946 |
|
|
3 | Protocol/Next Header | if PR = 1 |
| 1947 |
|
|
..... ..... ..... ..... ..... ..... ..... ..... |
| 1948 |
|
|
4 / IP extension headers / variable, if IPX = 1 |
| 1949 |
|
|
..... ..... ..... ..... ..... ..... ..... ..... |
| 1950 |
|
|
|
| 1951 |
|
|
Ip id is coded here for both inner and outer fields though it doesn't look that way |
| 1952 |
|
|
in the extension 3 picture in 5.7.5 and 5.11.4 of rfc 3095 |
| 1953 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1954 |
|
|
5 | IP-ID | 2 octets, if I = 1 |
| 1955 |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+ |
| 1956 |
|
|
|
| 1957 |
|
|
4 is not supported. |
| 1958 |
|
|
|
| 1959 |
|
|
*/ |
| 1960 |
|
|
int udp_lite_header_fields(struct sc_context *context, |
| 1961 |
|
|
unsigned short changed_fields, |
| 1962 |
|
|
struct sc_udp_lite_header *ip_hdr_profile, |
| 1963 |
|
|
int counter, |
| 1964 |
|
|
boolean is_outer, |
| 1965 |
|
|
int nr_ip_id_bits, |
| 1966 |
|
|
const struct iphdr *ip, |
| 1967 |
|
|
unsigned char *dest, |
| 1968 |
|
|
int context_rnd) |
| 1969 |
|
|
{ |
| 1970 |
|
|
// 1 |
| 1971 |
|
|
if(udp_lite_is_changed(changed_fields,MOD_TOS) || (ip_hdr_profile->tos_count < MAX_FO_COUNT)){ |
| 1972 |
|
|
ip_hdr_profile->tos_count++; |
| 1973 |
|
|
dest[counter] = ip->tos; |
| 1974 |
|
|
counter++; |
| 1975 |
|
|
} |
| 1976 |
|
|
|
| 1977 |
|
|
// 2 |
| 1978 |
|
|
if(udp_lite_is_changed(changed_fields,MOD_TTL) || (ip_hdr_profile->ttl_count < MAX_FO_COUNT)){ |
| 1979 |
|
|
ip_hdr_profile->ttl_count++; |
| 1980 |
|
|
dest[counter] = ip->ttl; |
| 1981 |
|
|
counter++; |
| 1982 |
|
|
} |
| 1983 |
|
|
|
| 1984 |
|
|
// 3 |
| 1985 |
|
|
if(udp_lite_is_changed(changed_fields,MOD_PROTOCOL) || (ip_hdr_profile->protocol_count < MAX_FO_COUNT) ){ |
| 1986 |
|
|
ip_hdr_profile->protocol_count++; |
| 1987 |
|
|
dest[counter] = ip->protocol; |
| 1988 |
|
|
counter++; |
| 1989 |
|
|
} |
| 1990 |
|
|
|
| 1991 |
|
|
// 5 |
| 1992 |
|
|
if(is_outer){ |
| 1993 |
|
|
if(((nr_ip_id_bits > 0) && (context_rnd == 0)) || ((ip_hdr_profile->rnd_count-1 < MAX_FO_COUNT) && (context_rnd == 0))){ |
| 1994 |
|
|
|
| 1995 |
|
|
memcpy(&dest[counter], &ip->id, 2); |
| 1996 |
|
|
counter+=2; |
| 1997 |
|
|
|
| 1998 |
|
|
} |
| 1999 |
|
|
} |
| 2000 |
|
|
|
| 2001 |
|
|
|
| 2002 |
|
|
return counter; |
| 2003 |
|
|
} |
| 2004 |
|
|
|
| 2005 |
|
|
|
| 2006 |
|
|
|
| 2007 |
|
|
/*Decide what extension shall be used in the uo2 packet*/ |
| 2008 |
|
|
int udp_lite_decide_extension(struct sc_context *context) |
| 2009 |
|
|
{ |
| 2010 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 2011 |
|
|
int nr_ip_id_bits = udp_lite_profile->tmp_variables.nr_ip_id_bits; |
| 2012 |
|
|
int nr_ip_id_bits2 = udp_lite_profile->tmp_variables.nr_ip_id_bits2; |
| 2013 |
|
|
int nr_sn_bits = udp_lite_profile->tmp_variables.nr_sn_bits; |
| 2014 |
|
|
//if (ip_context->ttl_count < MAX_FO_COUNT || ip_context->tos_count < MAX_FO_COUNT || ip_context->df_count < MAX_FO_COUNT) |
| 2015 |
|
|
// return c_EXT3; |
| 2016 |
|
|
|
| 2017 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr == 1){ |
| 2018 |
|
|
if(udp_lite_profile->tmp_variables.send_static > 0){ |
| 2019 |
|
|
rohc_debugf(2,"Vi har ändrat static\n"); |
| 2020 |
|
|
return c_EXT3; |
| 2021 |
|
|
|
| 2022 |
|
|
} |
| 2023 |
|
|
if(udp_lite_profile->tmp_variables.send_dynamic > 0){ |
| 2024 |
|
|
return c_EXT3; |
| 2025 |
|
|
} |
| 2026 |
|
|
if(nr_sn_bits < 5 && (nr_ip_id_bits == 0 || context->rnd == 1)){ |
| 2027 |
|
|
return c_NOEXT; |
| 2028 |
|
|
} |
| 2029 |
|
|
else if(nr_sn_bits <= 8 && nr_ip_id_bits <= 3){ |
| 2030 |
|
|
return c_EXT0; |
| 2031 |
|
|
} |
| 2032 |
|
|
else if(nr_sn_bits <= 8 && nr_ip_id_bits <= 11){ |
| 2033 |
|
|
return c_EXT1; |
| 2034 |
|
|
} |
| 2035 |
|
|
else{ |
| 2036 |
|
|
return c_EXT3; |
| 2037 |
|
|
} |
| 2038 |
|
|
} |
| 2039 |
|
|
else{ |
| 2040 |
|
|
if(udp_lite_profile->tmp_variables.send_static > 0 || udp_lite_profile->tmp_variables.send_dynamic > 0){ |
| 2041 |
|
|
return c_EXT3; |
| 2042 |
|
|
|
| 2043 |
|
|
} |
| 2044 |
|
|
if(nr_sn_bits < 5 && (nr_ip_id_bits == 0 || context->rnd == 1) |
| 2045 |
|
|
&& (nr_ip_id_bits2 == 0 || context->rnd2 == 1)){ |
| 2046 |
|
|
return c_NOEXT; |
| 2047 |
|
|
} |
| 2048 |
|
|
else if(nr_sn_bits <= 8 && nr_ip_id_bits <= 3 |
| 2049 |
|
|
&& (nr_ip_id_bits2 == 0 || context->rnd2 == 1)){ |
| 2050 |
|
|
return c_EXT0; |
| 2051 |
|
|
} |
| 2052 |
|
|
else if(nr_sn_bits <= 8 && nr_ip_id_bits <= 11 |
| 2053 |
|
|
&& (nr_ip_id_bits2 == 0 || context->rnd2 == 1)){ |
| 2054 |
|
|
return c_EXT1; |
| 2055 |
|
|
} |
| 2056 |
|
|
else if(nr_sn_bits <= 3 && nr_ip_id_bits <= 11 |
| 2057 |
|
|
&& nr_ip_id_bits2 <= 8){ |
| 2058 |
|
|
return c_EXT2; |
| 2059 |
|
|
} |
| 2060 |
|
|
|
| 2061 |
|
|
else{ |
| 2062 |
|
|
return c_EXT3; |
| 2063 |
|
|
} |
| 2064 |
|
|
} |
| 2065 |
|
|
|
| 2066 |
|
|
} |
| 2067 |
|
|
/* |
| 2068 |
|
|
Check if the static part of the context has been changed in any of the two first headers |
| 2069 |
|
|
*/ |
| 2070 |
|
|
int udp_lite_changed_static_both_hdr(struct sc_context *context, |
| 2071 |
|
|
const struct iphdr *ip, |
| 2072 |
|
|
const struct iphdr *ip2) |
| 2073 |
|
|
{ |
| 2074 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 2075 |
|
|
unsigned char changed_fields = udp_lite_profile->tmp_variables.changed_fields; |
| 2076 |
|
|
unsigned char changed_fields2 = udp_lite_profile->tmp_variables.changed_fields2; |
| 2077 |
|
|
int return_value = 0; |
| 2078 |
|
|
|
| 2079 |
|
|
|
| 2080 |
|
|
return_value = udp_lite_changed_static_one_hdr(changed_fields,&udp_lite_profile->ip_flags,ip,context); |
| 2081 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 2082 |
|
|
return_value += udp_lite_changed_static_one_hdr(changed_fields2,&udp_lite_profile->ip2_flags,ip2,context); |
| 2083 |
|
|
} |
| 2084 |
|
|
return return_value; |
| 2085 |
|
|
} |
| 2086 |
|
|
|
| 2087 |
|
|
/* |
| 2088 |
|
|
Check if the static part of the context has been changed in one of header |
| 2089 |
|
|
*/ |
| 2090 |
|
|
int udp_lite_changed_static_one_hdr(unsigned short udp_lite_changed_fields, |
| 2091 |
|
|
struct sc_udp_lite_header *ip_header, |
| 2092 |
|
|
const struct iphdr *ip, |
| 2093 |
|
|
struct sc_context *context) |
| 2094 |
|
|
{ |
| 2095 |
|
|
int return_value = 0; |
| 2096 |
|
|
struct sc_udp_lite_context *org_udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 2097 |
|
|
|
| 2098 |
|
|
if (udp_lite_is_changed(udp_lite_changed_fields,MOD_PROTOCOL) || (ip_header->protocol_count < MAX_FO_COUNT)){ |
| 2099 |
|
|
rohc_debugf(2,"protocol_count %d\n",ip_header->protocol_count); |
| 2100 |
|
|
if (udp_lite_is_changed(udp_lite_changed_fields,MOD_PROTOCOL)) { |
| 2101 |
|
|
ip_header->protocol_count = 0; |
| 2102 |
|
|
org_udp_lite_profile->fo_count = 0; |
| 2103 |
|
|
} |
| 2104 |
|
|
|
| 2105 |
|
|
|
| 2106 |
|
|
return_value += 1; |
| 2107 |
|
|
} |
| 2108 |
|
|
return return_value; |
| 2109 |
|
|
|
| 2110 |
|
|
} |
| 2111 |
|
|
|
| 2112 |
|
|
|
| 2113 |
|
|
/* |
| 2114 |
|
|
Check if the dynamic parts are changed, it returns the number of |
| 2115 |
|
|
dynamic bytes that are changed in both of the two first headers |
| 2116 |
|
|
*/ |
| 2117 |
|
|
int udp_lite_changed_dynamic_both_hdr(struct sc_context *context, |
| 2118 |
|
|
const struct iphdr *ip, |
| 2119 |
|
|
const struct iphdr *ip2) |
| 2120 |
|
|
{ |
| 2121 |
|
|
int return_value = 0; |
| 2122 |
|
|
struct sc_udp_lite_context *udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 2123 |
|
|
int changed_fields = udp_lite_profile->tmp_variables.changed_fields; |
| 2124 |
|
|
int changed_fields2 = udp_lite_profile->tmp_variables.changed_fields2; |
| 2125 |
|
|
|
| 2126 |
|
|
return_value = udp_lite_changed_dynamic_one_hdr(changed_fields,&udp_lite_profile->ip_flags,ip,context->rnd,context->nbo,context); |
| 2127 |
|
|
//rohc_debugf(1,"return_value = %d \n",return_value); |
| 2128 |
|
|
if(udp_lite_profile->tmp_variables.nr_of_ip_hdr > 1){ |
| 2129 |
|
|
|
| 2130 |
|
|
return_value += udp_lite_changed_dynamic_one_hdr(changed_fields2,&udp_lite_profile->ip2_flags,ip2,context->rnd2,context->nbo2,context); |
| 2131 |
|
|
} |
| 2132 |
|
|
return return_value; |
| 2133 |
|
|
} |
| 2134 |
|
|
|
| 2135 |
|
|
/* |
| 2136 |
|
|
Check if the dynamic part of the context has been changed in one of header |
| 2137 |
|
|
*/ |
| 2138 |
|
|
int udp_lite_changed_dynamic_one_hdr(unsigned short udp_lite_changed_fields, |
| 2139 |
|
|
struct sc_udp_lite_header *ip_hdr_profile, |
| 2140 |
|
|
const struct iphdr *ip, |
| 2141 |
|
|
int context_rnd, |
| 2142 |
|
|
int context_nbo, |
| 2143 |
|
|
struct sc_context *context) |
| 2144 |
|
|
{ |
| 2145 |
|
|
int return_value = 0; |
| 2146 |
|
|
int small_flags = 0; |
| 2147 |
|
|
struct sc_udp_lite_context *org_udp_lite_profile = (struct sc_udp_lite_context *)context->profile_context; |
| 2148 |
|
|
|
| 2149 |
|
|
if (udp_lite_is_changed(udp_lite_changed_fields,MOD_TOS) || (ip_hdr_profile->tos_count < MAX_FO_COUNT)){ |
| 2150 |
|
|
|
| 2151 |
|
|
if (udp_lite_is_changed(udp_lite_changed_fields,MOD_TOS)){ |
| 2152 |
|
|
ip_hdr_profile->tos_count = 0; |
| 2153 |
|
|
org_udp_lite_profile->fo_count = 0; |
| 2154 |
|
|
} |
| 2155 |
|
|
|
| 2156 |
|
|
return_value += 1; |
| 2157 |
|
|
} |
| 2158 |
|
|
if(udp_lite_is_changed(udp_lite_changed_fields,MOD_TTL) || (ip_hdr_profile->ttl_count < MAX_FO_COUNT)){ |
| 2159 |
|
|
if (udp_lite_is_changed(udp_lite_changed_fields,MOD_TTL)){ |
| 2160 |
|
|
ip_hdr_profile->ttl_count = 0; |
| 2161 |
|
|
org_udp_lite_profile->fo_count = 0; |
| 2162 |
|
|
} |
| 2163 |
|
|
|
| 2164 |
|
|
return_value += 1; |
| 2165 |
|
|
} |
| 2166 |
|
|
/*if(udp_lite_is_changed(udp_lite_changed_fields,MOD_FRAG_OFF)){ |
| 2167 |
|
|
udp_lite_profile->df_count = 0; |
| 2168 |
|
|
return_value += 1; |
| 2169 |
|
|
}*/ |
| 2170 |
|
|
if((GET_DF(ip->frag_off) != GET_DF(ip_hdr_profile->old_ip.frag_off)) || (ip_hdr_profile->df_count < MAX_FO_COUNT)){ |
| 2171 |
|
|
if (GET_DF(ip->frag_off) != GET_DF(ip_hdr_profile->old_ip.frag_off)){ |
| 2172 |
|
|
ip_hdr_profile->ttl_count = 0; |
| 2173 |
|
|
org_udp_lite_profile->fo_count = 0; |
| 2174 |
|
|
} |
| 2175 |
|
|
return_value += 1; |
| 2176 |
|
|
} |
| 2177 |
|
|
|
| 2178 |
|
|
rohc_debugf(2,"rnd_count=%d nbo_count=%d\n", ip_hdr_profile->rnd_count, ip_hdr_profile->nbo_count); |
| 2179 |
|
|
if(context_rnd != ip_hdr_profile->old_rnd || ip_hdr_profile->rnd_count < MAX_FO_COUNT){ |
| 2180 |
|
|
|
| 2181 |
|
|
if (context_rnd != ip_hdr_profile->old_rnd) { |
| 2182 |
|
|
rohc_debugf(1,"RND changed, reseting count..\n"); |
| 2183 |
|
|
ip_hdr_profile->rnd_count = 0; |
| 2184 |
|
|
org_udp_lite_profile->fo_count = 0; |
| 2185 |
|
|
} |
| 2186 |
|
|
|
| 2187 |
|
|
small_flags += 1; |
| 2188 |
|
|
|
| 2189 |
|
|
} |
| 2190 |
|
|
rohc_debugf(2,"nbo = %d, old_nbo = %d \n",context_nbo,ip_hdr_profile->old_nbo); |
| 2191 |
|
|
if(context_nbo != ip_hdr_profile->old_nbo || ip_hdr_profile->nbo_count < MAX_FO_COUNT){ |
| 2192 |
|
|
if (context_nbo != ip_hdr_profile->old_nbo) { |
| 2193 |
|
|
rohc_debugf(1,"NBO changed, reseting count..\n"); |
| 2194 |
|
|
ip_hdr_profile->nbo_count = 0; |
| 2195 |
|
|
org_udp_lite_profile->fo_count = 0; |
| 2196 |
|
|
} |
| 2197 |
|
|
|
| 2198 |
|
|
small_flags += 1; |
| 2199 |
|
|
} |
| 2200 |
|
|
if(small_flags > 0) { |
| 2201 |
|
|
return_value += 1; |
| 2202 |
|
|
} |
| 2203 |
|
|
//rohc_debugf(1,"return_value = %d \n",return_value); |
| 2204 |
|
|
rohc_debugf(2,"udp_lite_changed_dynamic_both_hdr()=%d\n", return_value); |
| 2205 |
|
|
return return_value; |
| 2206 |
|
|
|
| 2207 |
|
|
|
| 2208 |
|
|
} |
| 2209 |
|
|
|
| 2210 |
|
|
int udp_lite_changed_udp_dynamic(struct sc_context *context,const struct udphdr *udp_lite){ |
| 2211 |
|
|
return 0; |
| 2212 |
|
|
} |
| 2213 |
|
|
|
| 2214 |
|
|
|
| 2215 |
|
|
/* |
| 2216 |
|
|
Check if a specified field is changed, it is checked against the bitfield |
| 2217 |
|
|
created in the function udp_lite_changed_fields |
| 2218 |
|
|
*/ |
| 2219 |
|
|
boolean udp_lite_is_changed(unsigned short udp_lite_changed_fields,unsigned short check_field) |
| 2220 |
|
|
{ |
| 2221 |
|
|
if((udp_lite_changed_fields & check_field) > 0) |
| 2222 |
|
|
return 1; |
| 2223 |
|
|
else |
| 2224 |
|
|
return 0; |
| 2225 |
|
|
} |
| 2226 |
|
|
/* |
| 2227 |
|
|
This function returns a bitpattern, the bits that are set is changed |
| 2228 |
|
|
*/ |
| 2229 |
|
|
unsigned short udp_lite_changed_fields(struct sc_udp_lite_header *ip_hdr_profile,const struct iphdr *ip) |
| 2230 |
|
|
{ |
| 2231 |
|
|
unsigned short ret_value = 0; |
| 2232 |
|
|
|
| 2233 |
|
|
//Kan version och header length bitordersskiftningar ha någon betydelse för oss?? |
| 2234 |
|
|
if(ip_hdr_profile -> old_ip.tos != ip -> tos) |
| 2235 |
|
|
ret_value |= MOD_TOS; |
| 2236 |
|
|
if(ip_hdr_profile -> old_ip.tot_len != ip -> tot_len) |
| 2237 |
|
|
ret_value |= MOD_TOT_LEN; |
| 2238 |
|
|
if(ip_hdr_profile -> old_ip.id != ip -> id) |
| 2239 |
|
|
ret_value |= MOD_ID; |
| 2240 |
|
|
if(ip_hdr_profile -> old_ip.frag_off != ip -> frag_off) |
| 2241 |
|
|
ret_value |= MOD_FRAG_OFF; |
| 2242 |
|
|
if(ip_hdr_profile -> old_ip.ttl != ip -> ttl) |
| 2243 |
|
|
ret_value |= MOD_TTL; |
| 2244 |
|
|
if(ip_hdr_profile -> old_ip.protocol != ip -> protocol) |
| 2245 |
|
|
ret_value |= MOD_PROTOCOL; |
| 2246 |
|
|
if(ip_hdr_profile -> old_ip.check != ip -> check) |
| 2247 |
|
|
ret_value |= MOD_CHECK; |
| 2248 |
|
|
if(ip_hdr_profile -> old_ip.saddr != ip -> saddr) |
| 2249 |
|
|
ret_value |= MOD_SADDR; |
| 2250 |
|
|
if(ip_hdr_profile -> old_ip.daddr != ip -> daddr) |
| 2251 |
|
|
ret_value |= MOD_DADDR; |
| 2252 |
|
|
|
| 2253 |
|
|
return ret_value; |
| 2254 |
|
|
} |
| 2255 |
|
|
/* |
| 2256 |
|
|
Function to determine if the ip-identification has nbo and if it is random |
| 2257 |
|
|
*/ |
| 2258 |
|
|
void udp_lite_check_ip_identification(struct sc_udp_lite_header *ip_hdr_profile, |
| 2259 |
|
|
const struct iphdr *ip, |
| 2260 |
|
|
int *context_rnd, |
| 2261 |
|
|
int *context_nbo) |
| 2262 |
|
|
{ |
| 2263 |
|
|
|
| 2264 |
|
|
int id1, id2; |
| 2265 |
|
|
int nbo = -1; |
| 2266 |
|
|
|
| 2267 |
|
|
id1 = ntohs(ip_hdr_profile->old_ip.id); |
| 2268 |
|
|
id2 = ntohs(ip->id); |
| 2269 |
|
|
|
| 2270 |
|
|
|
| 2271 |
|
|
rohc_debugf(2,"1) id1=0x%04x id2=0x%04x\n", id1, id2); |
| 2272 |
|
|
|
| 2273 |
|
|
if (id2-id1 < IPID_MAX_DELTA && id2-id1 > 0) |
| 2274 |
|
|
{ |
| 2275 |
|
|
nbo = 1; |
| 2276 |
|
|
} else if ((id1 + IPID_MAX_DELTA > 0xffff) && (id2 < ((id1+IPID_MAX_DELTA) & 0xffff))) { |
| 2277 |
|
|
nbo = 1; |
| 2278 |
|
|
} |
| 2279 |
|
|
|
| 2280 |
|
|
if (nbo == -1) { |
| 2281 |
|
|
// change byte ordering and check nbo=0 |
| 2282 |
|
|
id1 = (id1>>8) | ((id1<<8) & 0xff00); |
| 2283 |
|
|
id2 = (id2>>8) | ((id2<<8) & 0xff00); |
| 2284 |
|
|
|
| 2285 |
|
|
rohc_debugf(2,"2) id1=0x%04x id2=0x%04x\n", id1, id2); |
| 2286 |
|
|
|
| 2287 |
|
|
if (id2-id1 < IPID_MAX_DELTA && id2-id1 > 0) |
| 2288 |
|
|
{ |
| 2289 |
|
|
nbo = 0; |
| 2290 |
|
|
} else if ((id1 + IPID_MAX_DELTA > 0xffff) && (id2 < ((id1+IPID_MAX_DELTA) & 0xffff))) { |
| 2291 |
|
|
nbo = 0; |
| 2292 |
|
|
} |
| 2293 |
|
|
} |
| 2294 |
|
|
|
| 2295 |
|
|
if (nbo == -1) { |
| 2296 |
|
|
rohc_debugf(2,"check_ip_id(): RND detected!\n"); |
| 2297 |
|
|
*context_rnd = 1; |
| 2298 |
|
|
|
| 2299 |
|
|
} else { |
| 2300 |
|
|
rohc_debugf(2,"check_ip_id(): NBO=%d\n", nbo); |
| 2301 |
|
|
*context_rnd = 0; |
| 2302 |
|
|
*context_nbo = nbo; |
| 2303 |
|
|
} |
| 2304 |
|
|
|
| 2305 |
|
|
} |
| 2306 |
|
|
/*Function that set up how what context the compressor and decompressor will |
| 2307 |
|
|
have from the start */ |
| 2308 |
|
|
void udp_lite_initiate_coverage_context(struct sc_udp_lite_context *udp_lite_profile, |
| 2309 |
|
|
const struct udphdr *udp_lite, |
| 2310 |
|
|
unsigned char *dest, |
| 2311 |
|
|
struct sc_context *context) |
| 2312 |
|
|
|
| 2313 |
|
|
{ |
| 2314 |
|
|
int packet_length = udp_lite_profile->tmp_variables.udp_size; //from packet |
| 2315 |
|
|
if(udp_lite_profile->ir_count == 1){ |
| 2316 |
|
|
udp_lite_profile->cfp = 0; |
| 2317 |
|
|
udp_lite_profile->cfi = 1; |
| 2318 |
|
|
} |
| 2319 |
|
|
|
| 2320 |
|
|
rohc_debugf(2,"packet_length=%d\n", packet_length); |
| 2321 |
|
|
rohc_debugf(2,"udp_lite->len=%d\n", ntohs(udp_lite->len)); |
| 2322 |
|
|
|
| 2323 |
|
|
udp_lite_profile->cfp = (ntohs(udp_lite->len) != packet_length) || udp_lite_profile->cfp; |
| 2324 |
|
|
udp_lite_profile->cfi = (ntohs(udp_lite->len) == packet_length) && udp_lite_profile->cfi; |
| 2325 |
|
|
rohc_debugf(2,"cfp-value=%d\n", udp_lite_profile->cfp); |
| 2326 |
|
|
rohc_debugf(2,"cfi-value=%d\n", udp_lite_profile->cfi); |
| 2327 |
|
|
udp_lite_profile->tmp_coverage = udp_lite->len; |
| 2328 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2329 |
|
|
} |
| 2330 |
|
|
|
| 2331 |
|
|
/* |
| 2332 |
|
|
The function check if we have to send a ce-packet, |
| 2333 |
|
|
OBSERVE!!!! that its also updates the FK variable in the profile structure. |
| 2334 |
|
|
This have to be noticed. |
| 2335 |
|
|
*/ |
| 2336 |
|
|
boolean udp_lite_send_ce_packet(struct sc_udp_lite_context *udp_lite_profile, |
| 2337 |
|
|
const struct udphdr *udp_lite, |
| 2338 |
|
|
unsigned char *dest, |
| 2339 |
|
|
struct sc_context *context) |
| 2340 |
|
|
{ |
| 2341 |
|
|
boolean inferred; |
| 2342 |
|
|
boolean same; |
| 2343 |
|
|
int packet_length = udp_lite_profile->tmp_variables.udp_size; |
| 2344 |
|
|
|
| 2345 |
|
|
inferred = ntohs(udp_lite->len) == packet_length; |
| 2346 |
|
|
same = ntohs(udp_lite_profile->old_udp_lite.len) == ntohs(udp_lite->len); |
| 2347 |
|
|
if(udp_lite_profile->sent_ce_only_count > 0) |
| 2348 |
|
|
same = ntohs(udp_lite_profile->tmp_coverage) == ntohs(udp_lite->len); |
| 2349 |
|
|
|
| 2350 |
|
|
udp_lite_profile->tmp_coverage = udp_lite->len; |
| 2351 |
|
|
if(same){ |
| 2352 |
|
|
udp_lite_profile->coverage_equal_count++; |
| 2353 |
|
|
if(inferred) |
| 2354 |
|
|
udp_lite_profile->coverage_inferred_count++; |
| 2355 |
|
|
|
| 2356 |
|
|
|
| 2357 |
|
|
} |
| 2358 |
|
|
else{ |
| 2359 |
|
|
udp_lite_profile->coverage_equal_count = 0; |
| 2360 |
|
|
if(inferred){ |
| 2361 |
|
|
udp_lite_profile->coverage_inferred_count++; |
| 2362 |
|
|
} |
| 2363 |
|
|
else{ |
| 2364 |
|
|
udp_lite_profile->coverage_inferred_count = 0; |
| 2365 |
|
|
} |
| 2366 |
|
|
} |
| 2367 |
|
|
|
| 2368 |
|
|
if(udp_lite_profile->cfp == 0 && udp_lite_profile->cfi == 1){ |
| 2369 |
|
|
if(inferred == 0){ |
| 2370 |
|
|
if(udp_lite_profile->sent_ce_only_count < MAX_IR_COUNT){ |
| 2371 |
|
|
udp_lite_profile->sent_ce_only_count++; |
| 2372 |
|
|
udp_lite_profile->FK = 0x01; |
| 2373 |
|
|
return 1; |
| 2374 |
|
|
} |
| 2375 |
|
|
else { |
| 2376 |
|
|
if(udp_lite_profile->coverage_equal_count > MAX_LITE_COUNT){ |
| 2377 |
|
|
udp_lite_profile->cfp = 0; |
| 2378 |
|
|
udp_lite_profile->cfi = 0; |
| 2379 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2380 |
|
|
udp_lite_profile->sent_ce_off_count = 1; |
| 2381 |
|
|
udp_lite_profile->FK = 0x03; |
| 2382 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2383 |
|
|
return 1; |
| 2384 |
|
|
} |
| 2385 |
|
|
else{ |
| 2386 |
|
|
udp_lite_profile->cfp = 1; |
| 2387 |
|
|
udp_lite_profile->cfi = 0; |
| 2388 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2389 |
|
|
udp_lite_profile->sent_ce_on_count = 1; |
| 2390 |
|
|
udp_lite_profile->FK = 0x02; |
| 2391 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2392 |
|
|
return 1; |
| 2393 |
|
|
} |
| 2394 |
|
|
|
| 2395 |
|
|
} |
| 2396 |
|
|
} |
| 2397 |
|
|
|
| 2398 |
|
|
} |
| 2399 |
|
|
else if(udp_lite_profile->cfp == 0 && udp_lite_profile->cfi == 0){ |
| 2400 |
|
|
if(inferred || (!inferred && !same)){ |
| 2401 |
|
|
if(udp_lite_profile->sent_ce_only_count < MAX_IR_COUNT){ |
| 2402 |
|
|
udp_lite_profile->sent_ce_only_count++; |
| 2403 |
|
|
udp_lite_profile->FK = 0x01; |
| 2404 |
|
|
return 1; |
| 2405 |
|
|
} |
| 2406 |
|
|
else{ |
| 2407 |
|
|
if(udp_lite_profile->coverage_inferred_count > MAX_LITE_COUNT){ |
| 2408 |
|
|
udp_lite_profile->cfp = 0; |
| 2409 |
|
|
udp_lite_profile->cfi = 1; |
| 2410 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2411 |
|
|
udp_lite_profile->sent_ce_off_count = 1; |
| 2412 |
|
|
udp_lite_profile->FK = 0x03; |
| 2413 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2414 |
|
|
return 1; |
| 2415 |
|
|
} |
| 2416 |
|
|
else{ |
| 2417 |
|
|
udp_lite_profile->cfp = 1; |
| 2418 |
|
|
udp_lite_profile->cfi = 0; |
| 2419 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2420 |
|
|
udp_lite_profile->sent_ce_on_count = 1; |
| 2421 |
|
|
udp_lite_profile->FK = 0x02; |
| 2422 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2423 |
|
|
return 1; |
| 2424 |
|
|
} |
| 2425 |
|
|
} |
| 2426 |
|
|
} |
| 2427 |
|
|
} |
| 2428 |
|
|
|
| 2429 |
|
|
else if(udp_lite_profile->cfp == 1){ |
| 2430 |
|
|
if(inferred || (inferred && same)){ |
| 2431 |
|
|
if(udp_lite_profile->coverage_equal_count > MAX_LITE_COUNT){ |
| 2432 |
|
|
udp_lite_profile->sent_ce_off_count = 1; |
| 2433 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2434 |
|
|
udp_lite_profile->cfp = 0; |
| 2435 |
|
|
udp_lite_profile->cfi = 0; |
| 2436 |
|
|
udp_lite_profile->FK = 0x03; |
| 2437 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2438 |
|
|
return 1; |
| 2439 |
|
|
} |
| 2440 |
|
|
else if(udp_lite_profile->coverage_inferred_count > MAX_LITE_COUNT){ |
| 2441 |
|
|
udp_lite_profile->sent_ce_off_count = 1; |
| 2442 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2443 |
|
|
udp_lite_profile->cfp = 0; |
| 2444 |
|
|
udp_lite_profile->cfi = 1; |
| 2445 |
|
|
udp_lite_profile->FK = 0x03; |
| 2446 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2447 |
|
|
return 1; |
| 2448 |
|
|
} |
| 2449 |
|
|
} |
| 2450 |
|
|
} |
| 2451 |
|
|
|
| 2452 |
|
|
if(udp_lite_profile->sent_ce_off_count < MAX_IR_COUNT){ |
| 2453 |
|
|
udp_lite_profile->sent_ce_off_count++; |
| 2454 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2455 |
|
|
udp_lite_profile->FK = 0x03; |
| 2456 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2457 |
|
|
return 1; |
| 2458 |
|
|
}else if(udp_lite_profile->sent_ce_on_count < MAX_IR_COUNT){ |
| 2459 |
|
|
udp_lite_profile->sent_ce_on_count++; |
| 2460 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2461 |
|
|
udp_lite_profile->FK = 0x02; |
| 2462 |
|
|
udp_lite_profile->old_udp_lite = *udp_lite; |
| 2463 |
|
|
return 1; |
| 2464 |
|
|
} |
| 2465 |
|
|
|
| 2466 |
|
|
udp_lite_profile->sent_ce_only_count = 0; |
| 2467 |
|
|
return 0; |
| 2468 |
|
|
|
| 2469 |
|
|
} |
| 2470 |
|
|
|
| 2471 |
|
|
/* |
| 2472 |
|
|
A struct thate every function must have the first fieldtell what protocol this profile has. |
| 2473 |
|
|
The second row is the profile id-number, Then two strings that is for printing version and |
| 2474 |
|
|
description. And finally pointers to functions that have to exist in every profile. |
| 2475 |
|
|
*/ |
| 2476 |
|
|
struct sc_profile c_udp_lite_profile = { |
| 2477 |
|
|
UDP_LITE_PRNR, |
| 2478 |
|
|
8, // Profile ID |
| 2479 |
|
|
"1.0b", // Version |
| 2480 |
|
|
"UDP-Lite / Compressor", // Description |
| 2481 |
|
|
c_udp_lite_create, |
| 2482 |
|
|
c_udp_lite_destroy, |
| 2483 |
|
|
c_udp_lite_check_context, |
| 2484 |
|
|
c_udp_lite_encode, |
| 2485 |
|
|
c_udp_lite_feedback |
| 2486 |
|
|
}; |
| 2487 |
|
|
|
