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/* |
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ROHC Project 2003 at Lulea University of Technology, Sweden. |
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Authors: Andreas Vernersson <andver-8@student.luth.se> |
4 |
Daniel Pettersson <danpet-7@student.luth.se> |
5 |
Erik Soderstrom <soderstrom@yahoo.com> |
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Fredrik Lindstrom <frelin-9@student.luth.se> |
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Johan Stenmark <johste-8@student.luth.se> |
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Martin Juhlin <juhlin@users.sourceforge.net> |
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Mikael Larsson <larmik-9@student.luth.se> |
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Robert Maxe <robmax-1@student.luth.se> |
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|
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Copyright (C) 2003 Andreas Vernersson, Daniel Pettersson, |
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Erik Soderström, Fredrik Lindström, Johan Stenmark, |
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Martin Juhlin, Mikael Larsson, Robert Maxe. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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// IP-Only profile in decompressor |
31 |
|
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/* The decode functions decode the packet, control CRC |
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* and if crc-fails the try a new decompression with a |
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* other SN number. The decode functions returns some |
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* kind of ROHC_ERROR or if it is correct decoded the |
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* length of the decoded packet is returned. |
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*/ |
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|
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#include "rohc.h" |
40 |
#include "decomp.h" |
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|
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#include "d_ip.h" |
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#include "d_util.h" |
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#include "comp.h" |
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#include "c_util.h" |
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|
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//--------------------------------------------------------- Helpfunctions |
48 |
|
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/* Decode a UO-0 package */ |
50 |
static int decode_uo0( |
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struct sd_rohc * state, |
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struct sd_context * context, |
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unsigned char * head, |
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unsigned char * src, |
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unsigned char * dest, |
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int payload_size |
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); |
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|
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/* Decode a UO-1 package */ |
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static int decode_uo1( |
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struct sd_rohc * state, |
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struct sd_context * context, |
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unsigned char * head, |
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unsigned char * src2, |
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unsigned char * dest, |
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int payload_size |
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); |
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|
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/* Decode a UO-2 package */ |
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static int decode_uor2( |
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struct sd_rohc * state, |
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struct sd_context * context, |
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unsigned char * head, |
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unsigned char * src2, |
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unsigned char * dest, |
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int payload_size |
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); |
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|
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/* Decode a IR-Dyn package */ |
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static int decode_irdyn( |
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struct sd_rohc * state, |
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struct sd_context * context, |
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unsigned char * head, |
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unsigned char * src2, |
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unsigned char * dest, |
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int payload_size |
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); |
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|
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/* Decode extention 0 */ |
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static int decode_extention0(unsigned char * src, int * sn, int * ip_id); |
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|
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/* Decode extention 1 */ |
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static int decode_extention1(unsigned char * src, int * sn, int * ip_id); |
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|
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/* Decode extention 2 */ |
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static int decode_extention2(unsigned char * src, int * sn, int * ip_id, int * ip_id2); |
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|
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/* Decode extention 3 |
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* - Updates random fields in the s_iponly_change |
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* - May update the SN value with 8 lower bits. sn_size is then changed |
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*/ |
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static int decode_extention3(unsigned char * src, struct sd_context * context, struct sd_rohc *state, |
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int * sn, int * sn_size, int * ip_id_changed, int * id2_updated); |
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|
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// Make a copy of the "active"-struct to the "last"-struct. |
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static void syncronize(struct s_iponly_profile_data *); |
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|
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// Decode package type |
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static int package_type(const unsigned char * p); |
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|
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/* Deceide the extention type */ |
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static int extention_type(const unsigned char * p); |
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|
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/* Write a uncompressed IP v4 header */ |
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static void write_uncompressed_ip4( |
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struct s_iponly_change * active1, |
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int ip_id, |
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unsigned char * dest, |
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int payload_size |
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); |
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|
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|
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/* Copy the last-struct to active-struct. */ |
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static void sync_on_failure(struct s_iponly_profile_data * pro); |
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|
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/* Decode inner IP flags and fields. Storage the values |
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* in a IP-head struct. |
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*/ |
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static int decode_inner_header_flags( |
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unsigned char * flags, |
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unsigned char * fields, |
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struct iphdr * ip, |
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int * rnd, int * nbo); |
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|
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/* Decode outer IP flags and fields. Storage the values |
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* in a IP-head struct. |
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*/ |
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static int decode_outer_header_flags( |
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unsigned char * flags, |
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unsigned char * fields, |
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struct iphdr * ip, |
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int * rnd, int * nbo, |
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int * ip_changed); |
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|
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/* A functions that decode uo0 and uo1 packets |
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* |
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*/ |
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static int help_to_decode_uo0_and_uo1( |
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struct sd_context * context, |
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unsigned char * src, |
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unsigned char * dest, |
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int * payload_size, |
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int sn_bits, |
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int number_of_sn_bits, |
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int * id, |
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int number_of_id_bits, |
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int * id2, |
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int * sn, |
159 |
int * calc_crc |
160 |
); |
161 |
|
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/* A functions that decode uor2 packets |
163 |
* |
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*/ |
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static int help_to_decode_uor2( |
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struct sd_rohc * state, |
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struct sd_context * context, |
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unsigned char * src2, |
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unsigned char * dest, |
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int * payload_size, |
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int * id, |
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int * id2, |
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int * sn, |
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int * sn_size, |
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int sn_bits, |
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int ext, |
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int * calc_crc |
178 |
); |
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|
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/* The function that try to correct a packet after |
181 |
* a crc-failure. |
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* It try with an other SN value. |
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*/ |
184 |
static int act_on_crc_failure( |
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struct sd_rohc * state, |
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struct sd_context * context, |
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unsigned char * src, |
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unsigned char * dest, |
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int sn_size, |
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int * sn_curr1, |
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int sn_bits, |
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int * payload_size, |
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int * id, |
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int id_size, |
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int * id2, |
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int * calc_crc, |
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int * real_crc, |
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int ext |
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); |
200 |
|
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static void update_inter_packet(struct s_iponly_profile_data * pro); |
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//---------------------------------------------------------- Code |
203 |
|
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// To allocate profile data |
205 |
void * iponly_allocate_decode_data(void) |
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{ |
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struct s_iponly_profile_data * data; |
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struct s_iponly_change * ch; |
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void * p = kmalloc(sizeof(struct s_iponly_profile_data) + 4 * sizeof(struct s_iponly_change), |
210 |
GFP_ATOMIC); |
211 |
|
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if (p==NULL) { |
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rohc_debugf(0, "iponly_allocate_decode_data(): no mem for ip profile data\n"); |
214 |
return NULL; |
215 |
} |
216 |
|
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data = (struct s_iponly_profile_data *)p; |
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ch = (struct s_iponly_change *)(data + 1); |
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|
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memset(p, 0, sizeof(struct s_iponly_profile_data) + |
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4 * sizeof(struct s_iponly_change) ); |
222 |
|
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data->last1 = ch; ch++; |
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data->active1 = ch; ch++; |
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data->last2 = ch; ch++; |
226 |
data->active2 = ch; |
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|
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return p; |
229 |
} |
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|
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// To deallocate profile data |
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void iponly_free_decode_data(void * p) |
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{ |
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kfree(p); |
235 |
} |
236 |
|
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// Decode an IR-package and initalize context |
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int iponly_decode_ir( |
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struct sd_rohc * state, |
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struct sd_context * context, |
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unsigned char * src, |
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int copy_size, |
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int dynamic_present, |
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unsigned char * dest |
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) |
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{ |
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struct s_iponly_profile_data * pro = context->data; |
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struct s_iponly_change * active1 = pro->active1; |
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struct s_iponly_change * active2 = pro->active2; |
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|
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unsigned char * s = src; |
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unsigned char * d = dest; |
253 |
|
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int size, sn; |
255 |
|
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pro->current_packet_time = get_microseconds(); |
257 |
|
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// Ip4 static |
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size = d_decode_static_ip4(s, &active1->ip); |
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|
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if (active1->ip.protocol == PROTOCOL_IP_IN_IP){ |
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pro->multiple_ip = 1; |
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rohc_debugf(1, "Multiple IP header\n"); |
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}else{ |
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pro->multiple_ip = 0; |
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} |
267 |
|
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if (size == -1) { |
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return ROHC_ERROR; |
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} |
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s += size; copy_size -= size; |
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|
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// If multiple-ip-header |
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if(pro->multiple_ip){ |
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size = d_decode_static_ip4(s, &active2->ip); |
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s += size; copy_size -= size; |
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if (size == -1) { |
278 |
return ROHC_ERROR; |
279 |
} |
280 |
} |
281 |
|
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// Dynamic field |
283 |
if (dynamic_present) { |
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size = d_decode_dynamic_ip4(s, &active1->ip, &active1->rnd, &active1->nbo); |
285 |
s += size; copy_size -= (size + 2); |
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|
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// If multiple-ip-header |
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if(pro->multiple_ip){ |
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size = d_decode_dynamic_ip4(s, &active2->ip, &active2->rnd, &active2->nbo); |
290 |
s += size; copy_size -= size; |
291 |
} |
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// Reset the correction-counter |
293 |
pro->counter = 0; |
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|
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// Get and set SN |
296 |
sn = ntohs(* ((u16 *)s)); |
297 |
d_lsb_init(&pro->sn, sn, -1); |
298 |
d_ip_id_init(&pro->ip_id1, ntohs(active1->ip.id), sn); |
299 |
s += 2; |
300 |
context->state = ROHC_FULL_CONTEXT; |
301 |
|
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// If multiple-ip-header |
303 |
if(pro->multiple_ip){ |
304 |
d_ip_id_init(&pro->ip_id2, ntohs(active2->ip.id), sn); |
305 |
} |
306 |
|
307 |
|
308 |
} else if (context->state != ROHC_FULL_CONTEXT) { |
309 |
// in static/no context and not get dynamic part |
310 |
return ROHC_ERROR; |
311 |
} |
312 |
|
313 |
|
314 |
// Header write |
315 |
if (pro->multiple_ip){ |
316 |
write_uncompressed_ip4(active1, ntohs(active1->ip.id), d, copy_size+sizeof(struct iphdr)); |
317 |
d += sizeof(struct iphdr); |
318 |
write_uncompressed_ip4(active2, ntohs(active2->ip.id), d, copy_size); |
319 |
|
320 |
}else{ |
321 |
write_uncompressed_ip4(active1, ntohs(active1->ip.id), d, copy_size); |
322 |
} |
323 |
d += sizeof(struct iphdr); |
324 |
|
325 |
// Syncronizerar strukterna |
326 |
syncronize(pro); |
327 |
|
328 |
// Update the inter-packet variable |
329 |
update_inter_packet(pro); |
330 |
|
331 |
// Copy payload |
332 |
if (copy_size == 0) return ROHC_OK_NO_DATA; |
333 |
|
334 |
memcpy(d, s, copy_size); |
335 |
|
336 |
// Statistics: |
337 |
context->header_compressed_size += s - src; |
338 |
c_add_wlsb(context->header_16_compressed, 0,0, s - src); |
339 |
context->header_uncompressed_size += (pro->multiple_ip+1)*sizeof(struct iphdr); |
340 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (pro->multiple_ip+1)*sizeof(struct iphdr)); |
341 |
|
342 |
return copy_size + (pro->multiple_ip + 1) * sizeof(struct iphdr); |
343 |
} |
344 |
|
345 |
// Calculate the size of data in an IR-package. |
346 |
// return : size or zero. |
347 |
int iponly_detect_ir_size(unsigned char * first_byte, int second_byte_add) |
348 |
{ |
349 |
int ret = 10; |
350 |
int d = GET_BIT_0(first_byte); |
351 |
if (d) ret += 5 + 2; |
352 |
if (first_byte[second_byte_add + 2] != 0x40) return 0; |
353 |
if (first_byte[second_byte_add + 3] == PROTOCOL_IP_IN_IP){ |
354 |
ret += 10; |
355 |
if (d) ret += 5; |
356 |
if (first_byte[second_byte_add + 12] != 0x40) return 0; |
357 |
} |
358 |
return ret; |
359 |
} |
360 |
|
361 |
// Calculate the size of data in an IR-package. |
362 |
// return : size or zero. |
363 |
int iponly_detect_ir_dyn_size(unsigned char * first_byte, struct sd_context *c) |
364 |
{ |
365 |
struct s_iponly_profile_data * pro = c->data; |
366 |
if (pro->active1->ip.protocol == PROTOCOL_IP_IN_IP) return 12; |
367 |
return 7; |
368 |
} |
369 |
|
370 |
// Decode all package except IR-package. |
371 |
int iponly_decode( |
372 |
struct sd_rohc * state, |
373 |
struct sd_context * context, |
374 |
unsigned char * src, |
375 |
int size, |
376 |
int second_byte, |
377 |
unsigned char * dest |
378 |
) |
379 |
{ |
380 |
struct s_iponly_profile_data * pro = context->data; |
381 |
// ---- DEBUG ---- |
382 |
int i; unsigned char * p; |
383 |
|
384 |
struct s_iponly_change * active1 = pro->active1; |
385 |
struct s_iponly_change * active2 = pro->active2; |
386 |
struct s_iponly_change * last1 = pro->last1; |
387 |
struct s_iponly_change * last2 = pro->last2; |
388 |
|
389 |
pro->current_packet_time = get_microseconds(); |
390 |
|
391 |
rohc_debugf(2,"(iponly_decode) nbo = %d rnd = %d\n", last1->nbo, last1->rnd); |
392 |
if (pro->multiple_ip){ |
393 |
rohc_debugf(2,"Multiple ip-header\n"); |
394 |
rohc_debugf(2,"(iponly_decode) nbo2 = %d rnd2 = %d\n", last2->nbo, last2->rnd); |
395 |
} |
396 |
if (memcmp(active1, last1, sizeof(struct s_iponly_change)) != 0) { |
397 |
rohc_debugf(0,"(iponly_decode) last1 and active1 struct is not synchronized\n"); |
398 |
p = (unsigned char *)last1; |
399 |
for (i = 0; i < sizeof(struct s_iponly_change); i++) { |
400 |
rohc_debugf(1, "%2x ", p[i]); |
401 |
} |
402 |
rohc_debugf(1, "\nvs\n"); |
403 |
p = (unsigned char *)active1; |
404 |
for (i = 0; i < sizeof(struct s_iponly_change); i++) { |
405 |
rohc_debugf(1, "%2x ", p[i]); |
406 |
} |
407 |
rohc_debugf(1,"\n"); |
408 |
} |
409 |
if (memcmp(active2, last2, sizeof(struct s_iponly_change)) != 0) { |
410 |
rohc_debugf(0,"(iponly_decode) last2 and active2 struct is not synchronized\n"); |
411 |
p = (unsigned char *)last2; |
412 |
for (i = 0; i < sizeof(struct s_iponly_change); i++) { |
413 |
rohc_debugf(1,"%2x ", p[i]); |
414 |
} |
415 |
rohc_debugf(1,"\nvs\n"); |
416 |
p = (unsigned char *)active2; |
417 |
for (i = 0; i < sizeof(struct s_iponly_change); i++) { |
418 |
rohc_debugf(1,"%2x ", p[i]); |
419 |
} |
420 |
rohc_debugf(1,"\n"); |
421 |
} |
422 |
// ---- DEBUG ---- |
423 |
|
424 |
if (context->state == ROHC_NO_CONTEXT) return ROHC_ERROR; |
425 |
|
426 |
switch(package_type(src)) { |
427 |
case PACKAGE_UO_0: |
428 |
pro->package_type = PACKAGE_UO_0; |
429 |
if (context->state == ROHC_STATIC_CONTEXT) return ROHC_ERROR; |
430 |
return decode_uo0(state, context, src, src + second_byte, |
431 |
dest, size - second_byte); |
432 |
case PACKAGE_UO_1: |
433 |
pro->package_type = PACKAGE_UO_1; |
434 |
if (context->state == ROHC_STATIC_CONTEXT) return ROHC_ERROR; |
435 |
return decode_uo1(state, context, src, src + second_byte, |
436 |
dest, size - second_byte); |
437 |
case PACKAGE_UOR_2: |
438 |
pro->package_type = PACKAGE_UOR_2; |
439 |
return decode_uor2(state, context, src, src + second_byte, |
440 |
dest, size - second_byte); |
441 |
case PACKAGE_IR_DYN: |
442 |
return decode_irdyn(state, context, src, src + second_byte, |
443 |
dest, size - second_byte); |
444 |
default: |
445 |
rohc_debugf(0,"(Ip-only) Unknown package.\n"); |
446 |
return ROHC_ERROR; |
447 |
} |
448 |
} |
449 |
|
450 |
static int iponly_get_sn(struct sd_context * context) |
451 |
{ |
452 |
struct s_iponly_profile_data * pro = context->data; |
453 |
return d_get_lsb_ref(&pro->sn); |
454 |
} |
455 |
|
456 |
static struct s_profile d_ip_profile = {4, "1.0", "IP / Decompressor", |
457 |
iponly_decode, |
458 |
iponly_decode_ir, |
459 |
iponly_allocate_decode_data, |
460 |
iponly_free_decode_data, |
461 |
iponly_detect_ir_size, |
462 |
iponly_detect_ir_dyn_size, |
463 |
iponly_get_sn |
464 |
}; |
465 |
|
466 |
struct s_profile * iponly_profile_create() |
467 |
{ |
468 |
return &d_ip_profile; |
469 |
} |
470 |
|
471 |
// --------------------------------------------------------- Package type decoder |
472 |
|
473 |
/* Decode a UO-0 package */ |
474 |
static int decode_uo0( |
475 |
struct sd_rohc * state, |
476 |
struct sd_context * context, |
477 |
unsigned char * head, |
478 |
unsigned char * src, |
479 |
unsigned char * dest, |
480 |
int payload_size |
481 |
) |
482 |
{ |
483 |
unsigned char *saved_src = src; |
484 |
struct s_iponly_profile_data * pro = context->data; |
485 |
int multiple_ip = pro->multiple_ip; |
486 |
int id, id2=-1, sn, sn_bits = GET_BIT_3_6(head), sn_size = 4; |
487 |
int calc_crc, real_crc = GET_BIT_0_2(head); |
488 |
int extra_fields = 0, org_payload_size = payload_size; |
489 |
// Do the decoding / find ip-id |
490 |
extra_fields = help_to_decode_uo0_and_uo1(context, src, dest, &payload_size, sn_bits, sn_size , &id, 0 , &id2, &sn, &calc_crc); |
491 |
|
492 |
if (calc_crc != real_crc) { |
493 |
rohc_debugf(0,"UO-0: CRC failure (calc) %x vs %x (real)\n", |
494 |
calc_crc, real_crc); |
495 |
|
496 |
payload_size = org_payload_size; |
497 |
act_on_crc_failure(0,context, src, dest, sn_size, &sn, sn_bits, &payload_size, &id, 0, &id2, &calc_crc, &real_crc, 0); |
498 |
return ROHC_ERROR_CRC; |
499 |
} |
500 |
|
501 |
// if any crc-correction then three correct packet need to pass crc |
502 |
if(pro->counter){ |
503 |
if(pro->counter==1){ |
504 |
|
505 |
rohc_debugf(2,"Throw away packet, just 2 packages right so far\n"); |
506 |
|
507 |
pro->counter++; |
508 |
|
509 |
// Update the inter-packet variable |
510 |
update_inter_packet(pro); |
511 |
syncronize(pro); |
512 |
|
513 |
d_lsb_sync_ref(&pro->sn); |
514 |
d_lsb_update(&pro->sn, sn); |
515 |
d_ip_id_update(&pro->ip_id1, id, sn); |
516 |
if (pro->multiple_ip) |
517 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
518 |
|
519 |
return ROHC_ERROR_CRC; |
520 |
|
521 |
}else if(pro->counter==2){ |
522 |
pro->counter = 0; |
523 |
rohc_debugf(2,"The rapair is deemed successful\n"); |
524 |
}else{ |
525 |
rohc_debugf(2,"XX Should not happen XX\n"); |
526 |
} |
527 |
} |
528 |
|
529 |
src += extra_fields; |
530 |
|
531 |
// Update the inter-packet variable |
532 |
update_inter_packet(pro); |
533 |
syncronize(pro); |
534 |
|
535 |
// Update lsb and id structs on CRC-success |
536 |
d_lsb_sync_ref(&pro->sn); |
537 |
d_lsb_update(&pro->sn, sn); |
538 |
d_ip_id_update(&pro->ip_id1, id, sn); |
539 |
if (pro->multiple_ip){ |
540 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
541 |
dest += sizeof(struct iphdr); |
542 |
} |
543 |
|
544 |
// Payload |
545 |
dest += sizeof(struct iphdr); |
546 |
memcpy(dest, src, payload_size); |
547 |
|
548 |
// Statistics: |
549 |
context->header_compressed_size += src - saved_src; |
550 |
c_add_wlsb(context->header_16_compressed, 0,0, src - saved_src); |
551 |
context->header_uncompressed_size += (multiple_ip+1)*sizeof(struct iphdr); |
552 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (multiple_ip+1)*sizeof(struct iphdr)); |
553 |
|
554 |
return payload_size + (multiple_ip + 1) * sizeof(struct iphdr); |
555 |
} |
556 |
|
557 |
|
558 |
|
559 |
/* Decode a UO-1 package */ |
560 |
static int decode_uo1( |
561 |
struct sd_rohc * state, |
562 |
struct sd_context * context, |
563 |
unsigned char * head, |
564 |
unsigned char * src, |
565 |
unsigned char * dest, |
566 |
int payload_size |
567 |
) |
568 |
{ |
569 |
unsigned char *saved_src = src; |
570 |
struct s_iponly_profile_data * pro = context->data; |
571 |
|
572 |
int id = GET_BIT_0_5(head), id2=-1; |
573 |
int sn, sn_bits = GET_BIT_3_7(src), sn_size = 5; |
574 |
int org_payload_size, extra_fields=0; |
575 |
int calc_crc, real_crc = GET_BIT_0_2(src); |
576 |
src++; payload_size--; |
577 |
org_payload_size = payload_size; |
578 |
|
579 |
// Decode the id and sn |
580 |
extra_fields = help_to_decode_uo0_and_uo1(context, src, dest, &payload_size, sn_bits, sn_size , &id, 6 , &id2, &sn, &calc_crc); |
581 |
|
582 |
if (calc_crc != real_crc) { |
583 |
rohc_debugf(0,"UO-1: CRC failure (calc) %x vs %x (real)\n", |
584 |
calc_crc, real_crc); |
585 |
payload_size = org_payload_size; |
586 |
act_on_crc_failure(0,context, src, dest, sn_size, &sn, sn_bits, &payload_size, &id, 6, &id2, &calc_crc, &real_crc, 0); |
587 |
return ROHC_ERROR_CRC; |
588 |
} |
589 |
|
590 |
if(pro->counter){ |
591 |
if(pro->counter==1){ |
592 |
|
593 |
rohc_debugf(2,"Throw away packet, just 2 packages right so far\n"); |
594 |
|
595 |
pro->counter++; |
596 |
// Update the inter-packet variable |
597 |
|
598 |
update_inter_packet(pro); |
599 |
syncronize(pro); |
600 |
|
601 |
d_lsb_sync_ref(&pro->sn); |
602 |
d_lsb_update(&pro->sn, sn); |
603 |
d_ip_id_update(&pro->ip_id1, id, sn); |
604 |
if (pro->multiple_ip) |
605 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
606 |
|
607 |
return ROHC_ERROR_CRC; |
608 |
|
609 |
}else if(pro->counter==2){ |
610 |
pro->counter = 0; |
611 |
rohc_debugf(2,"The rapair is deemed successful\n"); |
612 |
}else{ |
613 |
rohc_debugf(2,"XX Should not happen XX\n"); |
614 |
} |
615 |
} |
616 |
|
617 |
src += extra_fields; |
618 |
|
619 |
// Update the inter-packet variable |
620 |
update_inter_packet(pro); |
621 |
|
622 |
syncronize(pro); |
623 |
|
624 |
d_lsb_sync_ref(&pro->sn); |
625 |
d_lsb_update(&pro->sn, sn); |
626 |
d_ip_id_update(&pro->ip_id1, id, sn); |
627 |
if (pro->multiple_ip){ |
628 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
629 |
dest += sizeof(struct iphdr); |
630 |
} |
631 |
|
632 |
// Payload |
633 |
dest += sizeof(struct iphdr); |
634 |
memcpy(dest, src, payload_size); |
635 |
|
636 |
// Statistics: |
637 |
context->header_compressed_size += src - saved_src; |
638 |
c_add_wlsb(context->header_16_compressed, 0,0, src - saved_src); |
639 |
context->header_uncompressed_size += (pro->multiple_ip+1)*sizeof(struct iphdr); |
640 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (pro->multiple_ip+1)*sizeof(struct iphdr)); |
641 |
|
642 |
return payload_size + (pro->multiple_ip + 1) * sizeof(struct iphdr); |
643 |
} |
644 |
|
645 |
|
646 |
/* Decode a UO-2 package */ |
647 |
static int decode_uor2( |
648 |
struct sd_rohc * state, |
649 |
struct sd_context * context, |
650 |
unsigned char * head, |
651 |
unsigned char * src, |
652 |
unsigned char * dest, |
653 |
int payload_size |
654 |
) |
655 |
{ |
656 |
unsigned char *saved_src = src; |
657 |
struct s_iponly_profile_data * pro = context->data; |
658 |
|
659 |
int org_payload_size = payload_size, extra_fields = 0; |
660 |
int sn_size = 0; |
661 |
int id = 0, id2 = 0, multiple_id = pro->multiple_ip; |
662 |
int calc_crc = 0; |
663 |
int sn_bits = GET_BIT_0_4(head) , sn = 0; |
664 |
int real_crc = GET_BIT_0_6(src); |
665 |
int ext = GET_BIT_7(src); |
666 |
src++; |
667 |
|
668 |
// Decode |
669 |
extra_fields = help_to_decode_uor2(state, context, src, dest, &payload_size, &id, &id2, &sn, &sn_size, sn_bits, ext, &calc_crc); |
670 |
|
671 |
if (calc_crc != real_crc) { |
672 |
rohc_debugf(0,"UOR-2: CRC failure (calc) %x vs %x (real)\n", |
673 |
calc_crc, real_crc); |
674 |
payload_size = org_payload_size; |
675 |
id =0 ; id2 = 0; calc_crc = 0; |
676 |
act_on_crc_failure(state, context, src, dest, sn_size, &sn, sn_bits, &payload_size, &id, 0, &id2, &calc_crc, &real_crc, ext); |
677 |
return ROHC_ERROR_CRC; |
678 |
} |
679 |
|
680 |
if(pro->counter){ |
681 |
if(pro->counter==1){ |
682 |
|
683 |
rohc_debugf(2,"Throw away packet, just 2 packages right so far\n"); |
684 |
|
685 |
pro->counter++; |
686 |
// Update the inter-packet variable |
687 |
|
688 |
update_inter_packet(pro); |
689 |
syncronize(pro); |
690 |
|
691 |
d_lsb_sync_ref(&pro->sn); |
692 |
d_lsb_update(&pro->sn, sn); |
693 |
d_ip_id_update(&pro->ip_id1, id, sn); |
694 |
if (pro->multiple_ip) |
695 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
696 |
|
697 |
return ROHC_ERROR_CRC; |
698 |
|
699 |
}else if(pro->counter==2){ |
700 |
pro->counter = 0; |
701 |
rohc_debugf(2,"The rapair is deemed successful\n"); |
702 |
}else{ |
703 |
rohc_debugf(2,"XX Should not happen XX\n"); |
704 |
} |
705 |
} |
706 |
|
707 |
context->state = ROHC_FULL_CONTEXT; |
708 |
|
709 |
src += extra_fields; |
710 |
|
711 |
// if crc success |
712 |
syncronize(pro); |
713 |
|
714 |
// Update the inter-packet variable |
715 |
update_inter_packet(pro); |
716 |
|
717 |
// Update |
718 |
d_lsb_sync_ref(&pro->sn); |
719 |
d_lsb_update(&pro->sn, sn); |
720 |
d_ip_id_update(&pro->ip_id1, id, sn); |
721 |
if (pro->multiple_ip){ |
722 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
723 |
dest += sizeof(struct iphdr); |
724 |
rohc_debugf(2,"Decomps reference ID2 = %d SN = %d\n",pro->ip_id2.id_ref,pro->ip_id2.sn_ref ); |
725 |
} |
726 |
// Payload |
727 |
dest += sizeof(struct iphdr); |
728 |
memcpy(dest, src, payload_size); |
729 |
rohc_debugf(2,"Decomps reference ID1 = %d SN = %d\n",pro->ip_id1.id_ref,pro->ip_id1.sn_ref ); |
730 |
rohc_debugf(2,"Decomps reference SN = %d\n",d_get_lsb_ref(&pro->sn)); |
731 |
|
732 |
// Statistics: |
733 |
context->header_compressed_size += src - saved_src; |
734 |
c_add_wlsb(context->header_16_compressed, 0,0, src - saved_src); |
735 |
context->header_uncompressed_size += (multiple_id+1)*sizeof(struct iphdr); |
736 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (multiple_id+1)*sizeof(struct iphdr)); |
737 |
|
738 |
return payload_size + (multiple_id +1) *sizeof(struct iphdr); |
739 |
|
740 |
} |
741 |
|
742 |
|
743 |
/* Decode a IR-Dyn package */ |
744 |
static int decode_irdyn( |
745 |
struct sd_rohc * state, |
746 |
struct sd_context * context, |
747 |
unsigned char * head, |
748 |
unsigned char * src2, |
749 |
unsigned char * dest, |
750 |
int payload_size |
751 |
) |
752 |
{ |
753 |
unsigned char *saved_src = src2; |
754 |
struct s_iponly_profile_data * pro = context->data; |
755 |
//struct s_iponly_change * last1 = pro->last1; |
756 |
struct s_iponly_change * active1 = pro->active1; |
757 |
struct s_iponly_change * active2 = pro->active2; |
758 |
int sn = 0, size = d_decode_dynamic_ip4(src2, &active1->ip, &active1->rnd, &active1->nbo); |
759 |
src2 += size; payload_size -= size + 2; |
760 |
|
761 |
if( pro->multiple_ip ){ |
762 |
size = d_decode_dynamic_ip4(src2, &active2->ip, &active2->rnd, &active2->nbo); |
763 |
src2 += size; payload_size -= size; |
764 |
} |
765 |
sn = ntohs(* ((u16 *)src2)); |
766 |
d_lsb_init(&pro->sn, sn, -1); |
767 |
d_ip_id_init(&pro->ip_id1,ntohs(active1->ip.id), sn); |
768 |
syncronize(pro); |
769 |
// reset the correction-counter |
770 |
pro->counter = 0; |
771 |
src2 += 2; |
772 |
|
773 |
if (pro->multiple_ip){ |
774 |
d_ip_id_init(&pro->ip_id2,ntohs(active2->ip.id), sn); |
775 |
rohc_debugf(2,"Decomps reference ID2 = %d SN = %d\n",pro->ip_id2.id_ref,pro->ip_id2.sn_ref ); |
776 |
write_uncompressed_ip4(active1, ntohs(active1->ip.id), dest, payload_size+sizeof(struct iphdr)); |
777 |
dest += sizeof(struct iphdr); |
778 |
write_uncompressed_ip4(active2, ntohs(active2->ip.id), dest, payload_size); |
779 |
}else{ |
780 |
write_uncompressed_ip4(active1, ntohs(active1->ip.id), dest, payload_size); |
781 |
} |
782 |
context->state = ROHC_FULL_CONTEXT; |
783 |
// Update the inter-packet variable |
784 |
update_inter_packet(pro); |
785 |
|
786 |
dest += sizeof(struct iphdr); |
787 |
memcpy(dest, src2, payload_size); |
788 |
rohc_debugf(2,"Decomps reference ID = %d SN = %d\n",pro->ip_id1.id_ref,pro->ip_id1.sn_ref ); |
789 |
rohc_debugf(2,"Decomps reference SN = %d\n",d_get_lsb_ref(&pro->sn)); |
790 |
|
791 |
// Statistics: |
792 |
context->header_compressed_size += src2 - saved_src; |
793 |
c_add_wlsb(context->header_16_compressed, 0,0, src2 - saved_src); |
794 |
context->header_uncompressed_size += (pro->multiple_ip+1)*sizeof(struct iphdr); |
795 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (pro->multiple_ip+1)*sizeof(struct iphdr)); |
796 |
|
797 |
return payload_size + ((pro->multiple_ip)+1) * sizeof(struct iphdr); |
798 |
} |
799 |
|
800 |
/* a help function that does the decoding of uo0 and uo1 packets */ |
801 |
static int help_to_decode_uo0_and_uo1( |
802 |
struct sd_context * context, |
803 |
unsigned char * src, |
804 |
unsigned char * dest, |
805 |
int * payload_size, |
806 |
int sn_bits, |
807 |
int number_of_sn_bits, |
808 |
int * id, |
809 |
int number_of_id_bits, |
810 |
int * id2, |
811 |
int * sn, |
812 |
int * calc_crc |
813 |
) |
814 |
{ |
815 |
struct s_iponly_profile_data * pro = context->data; |
816 |
struct s_iponly_change * active1 = pro->active1; |
817 |
struct s_iponly_change * active2 = pro->active2; |
818 |
int field_counter = 0; |
819 |
|
820 |
*sn = d_lsb_decode(&pro->sn, sn_bits, number_of_sn_bits); |
821 |
|
822 |
if (active1->rnd) { |
823 |
*id = ntohs(*((u16 *)src)); |
824 |
src += 2; field_counter +=2; *payload_size -= 2; |
825 |
|
826 |
} else { |
827 |
if(number_of_id_bits) |
828 |
*id = d_ip_id_decode(&pro->ip_id1, *id, number_of_id_bits, *sn); |
829 |
else |
830 |
*id = d_ip_id_decode(&pro->ip_id1, 0, 0, *sn); |
831 |
} |
832 |
|
833 |
// If multiple ip header |
834 |
if (pro->multiple_ip){ |
835 |
|
836 |
if (active2->rnd) { |
837 |
*id2 = ntohs(*((u16 *)src)); |
838 |
|
839 |
src +=2; field_counter +=2; *payload_size -= 2; |
840 |
} else { |
841 |
*id2 = d_ip_id_decode(&pro->ip_id2, 0, 0, *sn); |
842 |
} |
843 |
} |
844 |
|
845 |
// Header write |
846 |
if (pro->multiple_ip){ |
847 |
write_uncompressed_ip4(active1, *id, dest, *payload_size+sizeof(struct iphdr)); |
848 |
write_uncompressed_ip4(active2, *id2, dest+sizeof(struct iphdr),*payload_size); |
849 |
|
850 |
}else{ |
851 |
write_uncompressed_ip4(active1, *id, dest, *payload_size); |
852 |
} |
853 |
|
854 |
// Check CRC |
855 |
*calc_crc = crc_calculate(CRC_TYPE_3, dest, (pro->multiple_ip + 1) * sizeof(struct iphdr)); |
856 |
|
857 |
return field_counter; |
858 |
} |
859 |
|
860 |
/* a function that does the decoding of uor2 packets */ |
861 |
static int help_to_decode_uor2( |
862 |
struct sd_rohc * state, |
863 |
struct sd_context * context, |
864 |
unsigned char * src2, |
865 |
unsigned char * dest, |
866 |
int * payload_size, |
867 |
int * id, |
868 |
int * id2, |
869 |
int * sn, |
870 |
int * sn_size, |
871 |
int sn_bits, |
872 |
int ext, |
873 |
int * calc_crc |
874 |
) |
875 |
{ |
876 |
struct s_iponly_profile_data * pro = context->data; |
877 |
struct s_iponly_change * active1 = pro->active1; |
878 |
struct s_iponly_change * active2 = pro->active2; |
879 |
int id2_updated = 0, size = 0; |
880 |
int no_ip_id_update = 0; |
881 |
int field_counter = 0; |
882 |
|
883 |
*sn = sn_bits; |
884 |
|
885 |
if (ext) { |
886 |
// decode extention |
887 |
switch(extention_type(src2)) { |
888 |
case PACKAGE_EXT_0: |
889 |
size = decode_extention0(src2, sn, id); |
890 |
// ip_id_bits == 3 |
891 |
*sn_size = 8; |
892 |
*sn = d_lsb_decode(&pro->sn, *sn, *sn_size ); |
893 |
*id = d_ip_id_decode(&pro->ip_id1, *id, 3, *sn); |
894 |
*id2 = d_ip_id_decode(&pro->ip_id2, 0, 0, *sn); |
895 |
break; |
896 |
|
897 |
case PACKAGE_EXT_1: |
898 |
size = decode_extention1(src2, sn, id); |
899 |
// ip_id bits == 11 |
900 |
*sn_size = 8; |
901 |
*sn = d_lsb_decode(&pro->sn, *sn, *sn_size ); |
902 |
*id = d_ip_id_decode(&pro->ip_id1, *id, 11, *sn); |
903 |
*id2 = d_ip_id_decode(&pro->ip_id2, 0, 0, *sn); |
904 |
break; |
905 |
|
906 |
case PACKAGE_EXT_2: |
907 |
size = decode_extention2(src2, sn, id, id2); |
908 |
// ip_id bits == 8 |
909 |
*sn_size = 8; |
910 |
*sn = d_lsb_decode(&pro->sn, *sn, *sn_size ); |
911 |
*id2 = d_ip_id_decode(&pro->ip_id1, *id, 8, *sn);//inner |
912 |
*id = d_ip_id_decode(&pro->ip_id2, *id2, 11, *sn);//outer |
913 |
break; |
914 |
|
915 |
case PACKAGE_EXT_3: |
916 |
*sn_size = 5; |
917 |
size = decode_extention3(src2, context, state, sn, |
918 |
sn_size, &no_ip_id_update, &id2_updated); |
919 |
|
920 |
rohc_debugf(2,"(iponly_decode) after ext 3 : nbo = %d rnd = %d\n", active1->nbo, active1->rnd); |
921 |
|
922 |
*sn = d_lsb_decode(&pro->sn, *sn, *sn_size ); |
923 |
|
924 |
if (no_ip_id_update) { |
925 |
*id = ntohs(active1->ip.id); |
926 |
} else { |
927 |
*id = d_ip_id_decode(&pro->ip_id1, 0, 0, *sn); |
928 |
} |
929 |
if( pro->multiple_ip ){ |
930 |
rohc_debugf(2,"(iponly_decode) after ext 3 : nbo2 = %d rnd2 = %d\n", active2->nbo, active2->rnd); |
931 |
|
932 |
if (id2_updated){ |
933 |
*id2 = ntohs(active2->ip.id); |
934 |
}else |
935 |
*id2 = d_ip_id_decode(&pro->ip_id2, 0, 0, *sn); |
936 |
|
937 |
} |
938 |
break; |
939 |
} |
940 |
|
941 |
|
942 |
src2 += size; |
943 |
field_counter +=size; |
944 |
*payload_size -= size + 1; |
945 |
} else { |
946 |
// No extention |
947 |
*sn_size = 5; |
948 |
*sn = d_lsb_decode(&pro->sn, *sn , *sn_size); |
949 |
|
950 |
*id = d_ip_id_decode(&pro->ip_id1, 0, 0, *sn); |
951 |
if( pro->multiple_ip) |
952 |
*id2 = d_ip_id_decode(&pro->ip_id1, 0, 0, *sn); |
953 |
*payload_size -= 1; |
954 |
} |
955 |
|
956 |
|
957 |
// Random IP ID ? |
958 |
if (active1->rnd) { |
959 |
*id = ntohs(*((u16 *)src2)); |
960 |
src2 +=2; field_counter +=2; *payload_size -= 2; |
961 |
} |
962 |
|
963 |
// Multiple ip-header |
964 |
|
965 |
if (( pro->multiple_ip )&&( active2->rnd )){ |
966 |
*id2 = ntohs(*((u16 *)src2)); |
967 |
src2 +=2; field_counter +=2; *payload_size -= 2; |
968 |
} |
969 |
|
970 |
|
971 |
// Header write |
972 |
if (pro->multiple_ip){ |
973 |
write_uncompressed_ip4(active1, *id, dest, *payload_size+sizeof(struct iphdr)); |
974 |
write_uncompressed_ip4(active2, *id2, dest+sizeof(struct iphdr),*payload_size); |
975 |
}else{ |
976 |
write_uncompressed_ip4(active1, *id, dest, *payload_size); |
977 |
} |
978 |
|
979 |
// CRC-check |
980 |
*calc_crc = crc_calculate(CRC_TYPE_7, dest, (pro->multiple_ip + 1) * sizeof(struct iphdr)); |
981 |
|
982 |
return field_counter; |
983 |
} |
984 |
|
985 |
|
986 |
|
987 |
|
988 |
|
989 |
// --------------------------------------------------------- |
990 |
|
991 |
/* Decode extention 0. |
992 |
* - SN value is expanded with 3 lower bits |
993 |
* - IP-ID is replaced with 3 bits |
994 |
*/ |
995 |
static int decode_extention0(unsigned char * src, int * sn, int * ip_id) |
996 |
{ |
997 |
*sn = *sn << 3 | GET_BIT_3_5(src); |
998 |
*ip_id = GET_BIT_0_2(src); |
999 |
return 1; |
1000 |
} |
1001 |
|
1002 |
/* Decode extention 1 |
1003 |
* - SN value is expanded with 3 lower bits |
1004 |
* - IP-ID is replaced with 11 bits |
1005 |
*/ |
1006 |
static int decode_extention1(unsigned char * src, int * sn, int * ip_id) |
1007 |
{ |
1008 |
*sn = *sn << 3 | GET_BIT_3_5(src); |
1009 |
*ip_id = GET_BIT_0_2(src); |
1010 |
|
1011 |
src++; |
1012 |
*ip_id = *ip_id << 8 | *src; |
1013 |
|
1014 |
return 2; |
1015 |
} |
1016 |
|
1017 |
/* Decode extention 2 |
1018 |
* - SN value is expanded with 3 lower bits |
1019 |
* - IP-ID is replaced with 8 bits |
1020 |
*/ |
1021 |
static int decode_extention2(unsigned char * src, int * sn, int * ip_id, int * ip_id2) |
1022 |
{ |
1023 |
|
1024 |
*sn = *sn << 3 | GET_BIT_3_5(src); |
1025 |
*ip_id2 = GET_BIT_0_2(src); |
1026 |
src++; |
1027 |
|
1028 |
*ip_id2 = *ip_id2 << 8 | *src; |
1029 |
src++; |
1030 |
|
1031 |
*ip_id = *src; |
1032 |
return 3; |
1033 |
} |
1034 |
|
1035 |
/* Decode extention 3 |
1036 |
* - Updates random fields in the s_iponly_change |
1037 |
* - May update the SN value with 8 lower bits. sn_size is then changed |
1038 |
*/ |
1039 |
static int decode_extention3( |
1040 |
unsigned char * src, |
1041 |
struct sd_context * context, |
1042 |
struct sd_rohc * state, |
1043 |
int * sn, |
1044 |
int * sn_size, |
1045 |
int * ip_id_changed, |
1046 |
int * update_id2 |
1047 |
) |
1048 |
{ |
1049 |
struct s_iponly_profile_data * pro = context->data; |
1050 |
struct s_iponly_change * active1 = pro->active1; |
1051 |
struct s_iponly_change * active2 = pro->active2; |
1052 |
unsigned char * org = src; |
1053 |
unsigned char * fields = src + 1; |
1054 |
int S = GET_BIT_5(src); |
1055 |
int mode = GET_BIT_3_4(src); |
1056 |
int I = GET_BIT_2(src); |
1057 |
int ip = GET_BIT_1(src); |
1058 |
int ip2 = GET_BIT_0(src); |
1059 |
int size; |
1060 |
|
1061 |
src++; |
1062 |
|
1063 |
if (ip) fields++; |
1064 |
if (ip2) fields++; |
1065 |
|
1066 |
if (S) { |
1067 |
*sn = (*sn << 8) + *fields; |
1068 |
*sn_size += 8; |
1069 |
fields++; |
1070 |
} |
1071 |
|
1072 |
if (ip) { |
1073 |
if(pro->multiple_ip){ |
1074 |
size = decode_inner_header_flags(src, fields, &active2->ip, |
1075 |
&active2->rnd, &active2->nbo); |
1076 |
}else |
1077 |
size = decode_inner_header_flags(src, fields, &active1->ip, |
1078 |
&active1->rnd, &active1->nbo); |
1079 |
fields += size; |
1080 |
} |
1081 |
if (I) { |
1082 |
if(pro->multiple_ip){ |
1083 |
active2->ip.id = *((u16 *)fields); |
1084 |
fields += 2; |
1085 |
*update_id2 = 1; |
1086 |
}else{ |
1087 |
active1->ip.id = *((u16 *)fields); |
1088 |
fields += 2; |
1089 |
*ip_id_changed = 1; |
1090 |
} |
1091 |
} |
1092 |
if (ip2) { |
1093 |
size = decode_outer_header_flags(src, fields, &active1->ip, |
1094 |
&active1->rnd, &active1->nbo, ip_id_changed); |
1095 |
fields += size; |
1096 |
} |
1097 |
|
1098 |
if(mode != context->mode){ |
1099 |
rohc_debugf(2,"mode is not equal on decomp and comp.\n"); |
1100 |
d_change_mode_feedback(state, context); |
1101 |
} |
1102 |
return fields - org; |
1103 |
} |
1104 |
|
1105 |
// --------------------------------------------------------- Local utils functions |
1106 |
|
1107 |
// Deceide what package type |
1108 |
static int package_type(const unsigned char * p) |
1109 |
{ |
1110 |
if (!GET_BIT_7(p)) { |
1111 |
return PACKAGE_UO_0; |
1112 |
} else if (!GET_BIT_6(p)) { |
1113 |
return PACKAGE_UO_1; |
1114 |
} else if (GET_BIT_5_7(p) == 6) { |
1115 |
return PACKAGE_UOR_2; |
1116 |
} else if (*p == 0xf8) { |
1117 |
return PACKAGE_IR_DYN; |
1118 |
} else if ( (*p & 0xfe) == 0xfc) { |
1119 |
return PACKAGE_IR; |
1120 |
} else { |
1121 |
return PACKAGE_UNKNOWN; |
1122 |
} |
1123 |
} |
1124 |
|
1125 |
// Copy the active-structs to last-structs. |
1126 |
static void syncronize(struct s_iponly_profile_data * pro) |
1127 |
{ |
1128 |
memcpy(pro->last1, pro->active1, sizeof(struct s_iponly_change)); |
1129 |
memcpy(pro->last2, pro->active2, sizeof(struct s_iponly_change)); |
1130 |
} |
1131 |
|
1132 |
// Copy the last-structs to the active-structs. |
1133 |
static void sync_on_failure(struct s_iponly_profile_data * pro) |
1134 |
{ |
1135 |
memcpy(pro->active1, pro->last1, sizeof(struct s_iponly_change)); |
1136 |
memcpy(pro->active2, pro->last2, sizeof(struct s_iponly_change)); |
1137 |
} |
1138 |
|
1139 |
// Deceide the extention type |
1140 |
static int extention_type(const unsigned char * p) |
1141 |
{ |
1142 |
return GET_BIT_6_7(p); |
1143 |
} |
1144 |
|
1145 |
/* Decode inner IP flags and fields. Storage the values |
1146 |
* in a IP-head struct. |
1147 |
*/ |
1148 |
static int decode_inner_header_flags( |
1149 |
unsigned char * flags, |
1150 |
unsigned char * fields, |
1151 |
struct iphdr * ip, |
1152 |
int * rnd, int * nbo) |
1153 |
{ |
1154 |
int size = 0; |
1155 |
if (GET_BIT_7(flags)) { |
1156 |
ip->tos = *fields; |
1157 |
fields++; size++; |
1158 |
} |
1159 |
if (GET_BIT_6(flags)) { |
1160 |
ip->ttl = *fields; |
1161 |
fields++; size++; |
1162 |
} |
1163 |
if (GET_BIT_5(flags)) { |
1164 |
ip->frag_off = htons(IP_DF); |
1165 |
} else { |
1166 |
ip->frag_off = 0; |
1167 |
} |
1168 |
if (GET_BIT_4(flags)) { |
1169 |
ip->protocol = *fields; |
1170 |
fields++; size++; |
1171 |
} |
1172 |
if (GET_BIT_3(flags)) { |
1173 |
// TODO, list compression |
1174 |
rohc_debugf(0,"Listcompression is not supported\n"); |
1175 |
} |
1176 |
*nbo = GET_BIT_2(flags); |
1177 |
*rnd = GET_BIT_1(flags); |
1178 |
return size; |
1179 |
} |
1180 |
|
1181 |
/* Decode outer IP flags and fields. Storage the values |
1182 |
* in a IP-head struct. |
1183 |
*/ |
1184 |
static int decode_outer_header_flags( |
1185 |
unsigned char * flags, |
1186 |
unsigned char * fields, |
1187 |
struct iphdr * ip, |
1188 |
int * rnd, int * nbo, |
1189 |
int * updated_id) |
1190 |
{ |
1191 |
int size = 0; |
1192 |
if (GET_BIT_7(flags)) { |
1193 |
ip->tos = *fields; |
1194 |
fields++; size++; |
1195 |
} |
1196 |
if (GET_BIT_6(flags)) { |
1197 |
ip->ttl = *fields; |
1198 |
fields++; size++; |
1199 |
} |
1200 |
if (GET_BIT_5(flags)) { |
1201 |
ip->frag_off = htons(IP_DF); |
1202 |
} else { |
1203 |
ip->frag_off = 0; |
1204 |
} |
1205 |
if (GET_BIT_4(flags)) { |
1206 |
ip->protocol = *fields; |
1207 |
fields++; size++; |
1208 |
} |
1209 |
if (GET_BIT_3(flags)) { |
1210 |
// TODO, list compression |
1211 |
rohc_debugf(0,"Listcompression is not supported\n"); |
1212 |
} |
1213 |
*nbo = GET_BIT_2(flags); |
1214 |
*rnd = GET_BIT_1(flags); |
1215 |
|
1216 |
if (GET_BIT_0(flags)) { |
1217 |
ip->id = *((u16 *)fields); |
1218 |
fields += 2; size += 2; |
1219 |
*updated_id = 1; |
1220 |
} |
1221 |
return size; |
1222 |
} |
1223 |
|
1224 |
/* Write a uncompressed IP v4 header */ |
1225 |
static void write_uncompressed_ip4( |
1226 |
struct s_iponly_change * active, |
1227 |
int ip_id, |
1228 |
unsigned char * dest, |
1229 |
int payload_size |
1230 |
) |
1231 |
{ |
1232 |
struct iphdr * ip = (struct iphdr *)dest; |
1233 |
|
1234 |
// --- static & some changing |
1235 |
memcpy(dest, &active->ip, sizeof(struct iphdr)); |
1236 |
|
1237 |
// --- ip-id |
1238 |
ip->id = htons(ip_id); |
1239 |
if (!active->nbo) ip->id = __swab16(ip->id); |
1240 |
|
1241 |
//--- Static-known fields |
1242 |
ip->ihl = 5; |
1243 |
|
1244 |
//--- Interfered fields |
1245 |
ip->tot_len = htons(payload_size + (ip->ihl * 4)); |
1246 |
ip->check = 0; |
1247 |
ip->check = ip_fast_csum(dest, ip->ihl); |
1248 |
} |
1249 |
|
1250 |
|
1251 |
|
1252 |
/* This function try to repair the SN in one of two different ways |
1253 |
* |
1254 |
*/ |
1255 |
static int act_on_crc_failure( |
1256 |
struct sd_rohc * state, |
1257 |
struct sd_context * context, |
1258 |
unsigned char * src, |
1259 |
unsigned char * dest, |
1260 |
int sn_size, |
1261 |
int * sn, |
1262 |
int sn_bits, |
1263 |
int * payload_size, |
1264 |
int * id, |
1265 |
int id_size, |
1266 |
int * id2, |
1267 |
int * calc_crc, |
1268 |
int * real_crc, |
1269 |
int ext |
1270 |
) |
1271 |
{ |
1272 |
struct s_iponly_profile_data * pro = context->data; |
1273 |
|
1274 |
int sn_ref = 0, intervall = 0; |
1275 |
int sn_curr2 = 0, sn_curr1 = 0; |
1276 |
int sn_update = 0; |
1277 |
|
1278 |
sync_on_failure(pro); |
1279 |
|
1280 |
if(CRC_ACTION){ |
1281 |
rohc_debugf(0,"Try to repair the CRC\n"); |
1282 |
|
1283 |
if(pro->last_packet_time) //if last packettime == 0 then IR was just sent and ... |
1284 |
intervall = pro->current_packet_time - pro->last_packet_time; |
1285 |
|
1286 |
if(intervall > ((1 << sn_size)*(pro->inter_arrival_time))){ |
1287 |
rohc_debugf(0,"ROHC: repair with the assumption: SN LSB wraparound\n"); |
1288 |
rohc_debugf(2,"inter_arrival_time = %d and current intervall is = %d\n", pro->inter_arrival_time, intervall); |
1289 |
rohc_debugf(2,"add %d to SN\n", 1 << sn_size); |
1290 |
|
1291 |
// Try and update the SN |
1292 |
sn_ref = d_get_lsb_ref(&pro->sn); |
1293 |
sn_ref += (1 << sn_size); |
1294 |
d_lsb_sync_ref(&pro->sn); |
1295 |
d_lsb_update(&pro->sn, sn_ref); |
1296 |
*sn = d_lsb_decode(&pro->sn, sn_bits, sn_size ); |
1297 |
|
1298 |
pro->counter = 0; |
1299 |
|
1300 |
}else{ |
1301 |
// try with the old sn_ref value |
1302 |
|
1303 |
rohc_debugf(0,"ROHC: repair with the assumption: incorrect SN-updates\n"); |
1304 |
rohc_debugf(2,"inter_arrival_time = %d and current intervall is = %d\n", pro->inter_arrival_time, intervall); |
1305 |
|
1306 |
// save current referece value |
1307 |
sn_curr1 = d_get_lsb_ref(&pro->sn); |
1308 |
// test with old reference value |
1309 |
d_lsb_update(&pro->sn, d_get_lsb_old_ref(&pro->sn)); |
1310 |
|
1311 |
sn_curr2 = d_lsb_decode(&pro->sn, sn_bits, sn_size ); |
1312 |
|
1313 |
if( sn_curr2 == *sn){ |
1314 |
rohc_debugf(2,"with old ref value we get the same sn\n"); |
1315 |
return ROHC_ERROR_CRC; |
1316 |
} |
1317 |
*sn = sn_curr2; |
1318 |
d_lsb_update(&pro->sn, sn_curr2); |
1319 |
sn_update = 1; |
1320 |
pro->counter = 0; |
1321 |
} |
1322 |
rohc_debugf(2,"Try a new decompression with another sn \n"); |
1323 |
// Try a new decompression with another SN |
1324 |
switch (pro->package_type){ |
1325 |
case PACKAGE_UO_0: |
1326 |
//fall through |
1327 |
case PACKAGE_UO_1: |
1328 |
help_to_decode_uo0_and_uo1(context, src, dest, payload_size, sn_bits, sn_size , id, id_size, id2, sn, calc_crc); |
1329 |
break; |
1330 |
case PACKAGE_UOR_2: |
1331 |
*sn = sn_bits; |
1332 |
help_to_decode_uor2(state, context, src, dest, payload_size, id, id2, sn, &sn_size, sn_bits, ext, calc_crc); |
1333 |
break; |
1334 |
default: |
1335 |
rohc_debugf(0,"(Ip-only) A existing packet?\n"); |
1336 |
d_lsb_update(&pro->sn, sn_curr1); |
1337 |
return ROHC_ERROR_CRC; |
1338 |
} |
1339 |
|
1340 |
if (*calc_crc != *real_crc){ |
1341 |
rohc_debugf(0,"ROHC: CRC failure also on the second attempt (calc) %x vs %x (real)\n",*calc_crc, *real_crc); |
1342 |
pro->counter = 0; |
1343 |
if(sn_update) |
1344 |
d_lsb_update(&pro->sn, sn_curr1); //reference curr1 should be used |
1345 |
sync_on_failure(pro); |
1346 |
return ROHC_ERROR_CRC; |
1347 |
} |
1348 |
//CRC-pass |
1349 |
rohc_debugf(2,"Update and sync with the new SN then throw away the packet\n"); |
1350 |
pro->counter++; |
1351 |
update_inter_packet(pro); |
1352 |
|
1353 |
syncronize(pro); |
1354 |
|
1355 |
if(!sn_update){ |
1356 |
d_lsb_sync_ref(&pro->sn); |
1357 |
d_lsb_update(&pro->sn, *sn); |
1358 |
}else |
1359 |
d_lsb_update(&pro->sn, sn_curr2); |
1360 |
|
1361 |
d_ip_id_update(&pro->ip_id1, *id, *sn); |
1362 |
if (pro->multiple_ip) |
1363 |
d_ip_id_update(&pro->ip_id2, *id2, *sn); |
1364 |
|
1365 |
return ROHC_ERROR_CRC; |
1366 |
|
1367 |
}else{ |
1368 |
return ROHC_ERROR_CRC; |
1369 |
} |
1370 |
} |
1371 |
|
1372 |
/* Update the inter-packet time, a sort of averange over the last inter-packet times */ |
1373 |
static void update_inter_packet(struct s_iponly_profile_data * pro) |
1374 |
{ |
1375 |
int last_time = pro->last_packet_time; |
1376 |
int delta = 0; |
1377 |
rohc_debugf(2,"current time = %d and last time = %d\n", pro->current_packet_time, last_time); |
1378 |
|
1379 |
if (last_time) |
1380 |
delta = pro->current_packet_time - last_time; |
1381 |
pro->last_packet_time = pro->current_packet_time; |
1382 |
if (pro->inter_arrival_time){ |
1383 |
pro->inter_arrival_time = (pro->inter_arrival_time >> WEIGHT_OLD) + (delta >> WEIGHT_NEW); |
1384 |
|
1385 |
} else |
1386 |
pro->inter_arrival_time = delta; |
1387 |
|
1388 |
rohc_debugf(2,"inter_arrival_time = %d and current arrival delta is = %d\n", pro->inter_arrival_time, delta); |
1389 |
} |