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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> |
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Daniel Pettersson <danpet-7@student.luth.se> |
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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// The UDP profile in the decompressor |
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|
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#include <asm/byteorder.h> |
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|
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#include "rohc.h" |
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#include "decomp.h" |
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|
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#include "d_udp.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 |
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|
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/* Decode a UO-0 package */ |
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static int udp_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 udp_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 udp_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 udp_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 udp_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 udp_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 udp_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_udp_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 udp_decode_extention3( |
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unsigned char * src, |
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struct sd_rohc * state, |
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struct sd_context * sontext, |
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int * sn, |
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int * sn_size, |
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int * ip_id_changed, |
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int * id2_updated |
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); |
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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 udp_syncronize(struct s_udp_profile_data *); |
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|
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// Decode package type |
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static int udp_package_type(const unsigned char * p); |
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|
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/* Deceide the extention type */ |
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static int udp_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 udp_write_uncompressed_ip4( |
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struct s_udp_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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/* Write a uncompressed UDP header */ |
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static void udp_write_uncompressed_udp( |
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struct s_udp_change * active1, |
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int checksum, |
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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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|
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/* Copy the last-struct to active-struct. */ |
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static void udp_sync_on_failure(struct s_udp_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 udp_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 udp_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 * updated_id); |
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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 udp_do_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, |
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int * calc_crc |
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); |
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|
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/* A functions that decode uor2 packets |
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* |
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*/ |
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static int udp_do_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 |
189 |
); |
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|
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/* Try to repair the packet and do an other decompression |
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* |
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*/ |
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static int udp_crc_failure_action( |
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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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); |
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|
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// update the interpacket time |
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static void udp_update_packet_time(struct s_udp_profile_data * pro); |
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//---------------------------------------------------------- Code |
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|
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// Allocate the proflile data |
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void * udp_allocate_decode_data(void) |
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{ |
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struct s_udp_profile_data * data; |
219 |
struct s_udp_change * ch; |
220 |
void * p = kmalloc(sizeof(struct s_udp_profile_data) + 4 * sizeof(struct s_udp_change), |
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GFP_ATOMIC); |
222 |
|
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if (p==NULL) { |
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rohc_debugf(0, "udp_allocate_decode_data(): no mem for udp profile data\n"); |
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return NULL; |
226 |
} |
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|
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data = (struct s_udp_profile_data *)p; |
229 |
ch = (struct s_udp_change *)(data + 1); |
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|
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memset(p, 0, sizeof(struct s_udp_profile_data) + |
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4 * sizeof(struct s_udp_change) ); |
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|
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data->last1 = ch; ch++; |
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data->active1 = ch; ch++; |
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data->last2 = ch; ch++; |
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data->active2 = ch; |
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|
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return p; |
240 |
} |
241 |
|
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// Deallocate the profile data |
243 |
void udp_free_decode_data(void * p) |
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{ |
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kfree(p); |
246 |
} |
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|
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// Decode an IR-package and initalize context |
249 |
int udp_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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) |
257 |
{ |
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struct s_udp_profile_data * pro = context->data; |
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struct s_udp_change * active1 = pro->active1; |
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struct s_udp_change * active2 = pro->active2; |
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|
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unsigned char * s = src; |
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unsigned char * d = dest; |
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|
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int size, sn; |
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|
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pro->current_packet_time = get_microseconds(); |
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|
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pro->udp_checksum_present = 0; |
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|
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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 (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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// multiple IP ? |
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|
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if (active1->ip.protocol == PROTOCOL_IP_IN_IP){ |
282 |
pro->multiple_ip = 1; |
283 |
rohc_debugf(1, "Multiple IP header\n"); |
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}else{ |
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pro->multiple_ip = 0; |
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} |
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|
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// If multiple-ip-header |
289 |
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; |
292 |
if (size == -1) |
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return ROHC_ERROR; |
294 |
} |
295 |
|
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// Static UDP |
297 |
size = d_decode_static_udp(s, &active1->udp); |
298 |
s += size; copy_size -= size; |
299 |
|
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// Dynamic field |
301 |
if (dynamic_present) { |
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// Reset the correction-counter |
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pro->counter = 0; |
304 |
|
305 |
size = d_decode_dynamic_ip4(s, &active1->ip, &active1->rnd, &active1->nbo); |
306 |
s += size; copy_size -= (size + 2); |
307 |
|
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// If multiple-ip-header |
309 |
if(pro->multiple_ip){ |
310 |
size = d_decode_dynamic_ip4(s, &active2->ip, &active2->rnd, &active2->nbo); |
311 |
s += size; copy_size -= size; |
312 |
} |
313 |
|
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size = d_decode_dynamic_udp(s, &active1->udp); |
315 |
s += size; copy_size -= size; |
316 |
|
317 |
// If checksum == 0 then no checksum availible. |
318 |
pro->udp_checksum_present = active1->udp.check; |
319 |
|
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// Get and set SN |
321 |
sn = ntohs(* ((__u16 *)s)); |
322 |
d_lsb_init(&pro->sn, sn, -1); |
323 |
d_ip_id_init(&pro->ip_id1, ntohs(active1->ip.id), sn); |
324 |
s += 2; |
325 |
|
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// If multiple-ip-header |
327 |
if(pro->multiple_ip){ |
328 |
d_ip_id_init(&pro->ip_id2, ntohs(active2->ip.id), sn); |
329 |
} |
330 |
|
331 |
context->state = ROHC_FULL_CONTEXT; |
332 |
|
333 |
} else if (context->state != ROHC_FULL_CONTEXT) { |
334 |
// in static/no context and not get dynamic part |
335 |
return ROHC_ERROR; |
336 |
} |
337 |
|
338 |
|
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// Header write |
340 |
if (pro->multiple_ip){ |
341 |
udp_write_uncompressed_ip4(active1, ntohs(active1->ip.id), d, copy_size+sizeof(struct iphdr)+sizeof(struct udphdr)); |
342 |
d += sizeof(struct iphdr); |
343 |
udp_write_uncompressed_ip4(active2, ntohs(active2->ip.id), d, copy_size + sizeof(struct udphdr)); |
344 |
|
345 |
}else{ |
346 |
udp_write_uncompressed_ip4(active1, ntohs(active1->ip.id), d, copy_size + sizeof(struct udphdr)); |
347 |
} |
348 |
d += sizeof(struct iphdr); |
349 |
|
350 |
udp_write_uncompressed_udp(active1, ntohs(active1->udp.check), d, copy_size); |
351 |
|
352 |
d += sizeof(struct udphdr); |
353 |
|
354 |
// Syncronizerar strukterna |
355 |
udp_syncronize(pro); |
356 |
|
357 |
// Update the inter-packet variable |
358 |
udp_update_packet_time(pro); |
359 |
|
360 |
// Copy payload |
361 |
if (copy_size == 0) return ROHC_OK_NO_DATA; |
362 |
|
363 |
memcpy(d, s, copy_size); |
364 |
|
365 |
// Statistics: |
366 |
context->header_compressed_size += s - src; |
367 |
c_add_wlsb(context->header_16_compressed, 0,0, s - src); |
368 |
context->header_uncompressed_size += (pro->multiple_ip+1)*sizeof(struct iphdr) + sizeof(struct udphdr); |
369 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (pro->multiple_ip+1)*sizeof(struct iphdr) + sizeof(struct udphdr)); |
370 |
|
371 |
return copy_size + (pro->multiple_ip + 1) * sizeof(struct iphdr) + sizeof(struct udphdr); |
372 |
} |
373 |
|
374 |
// Calculate the size of data in an IR-package. |
375 |
// return : size or zero. |
376 |
int udp_detect_ir_size(unsigned char * first_byte, int second_byte_add) |
377 |
{ |
378 |
int ret = 14; |
379 |
int d = GET_BIT_0(first_byte); |
380 |
if (d) ret += 7 + 2; |
381 |
if (first_byte[second_byte_add + 2] != 0x40) return 0; |
382 |
if (first_byte[second_byte_add + 3] == PROTOCOL_IP_IN_IP){ |
383 |
ret += 10; |
384 |
if (d) ret += 5; |
385 |
if (first_byte[second_byte_add + 12] != 0x40) return 0; |
386 |
} |
387 |
return ret; |
388 |
} |
389 |
|
390 |
// Calculate the size of data in an IR-package. |
391 |
// return : size or zero. |
392 |
int udp_detect_ir_dyn_size(unsigned char * first_byte, struct sd_context *c) |
393 |
{ |
394 |
struct s_udp_profile_data * pro = c->data; |
395 |
if (pro->active1->ip.protocol == PROTOCOL_IP_IN_IP) return 14; |
396 |
return 9; |
397 |
} |
398 |
|
399 |
// Decode all package except IR-package. |
400 |
int udp_decode( |
401 |
struct sd_rohc * state, |
402 |
struct sd_context * context, |
403 |
unsigned char * src, |
404 |
int size, |
405 |
int second_byte, |
406 |
unsigned char * dest |
407 |
) |
408 |
{ |
409 |
struct s_udp_profile_data * pro = context->data; |
410 |
// ---- DEBUG ---- |
411 |
int i; unsigned char * p; |
412 |
|
413 |
struct s_udp_change * active1 = pro->active1; |
414 |
struct s_udp_change * active2 = pro->active2; |
415 |
struct s_udp_change * last1 = pro->last1; |
416 |
struct s_udp_change * last2 = pro->last2; |
417 |
|
418 |
pro->current_packet_time = get_microseconds(); |
419 |
|
420 |
rohc_debugf(2,"(udp_decode) nbo = %d rnd = %d\n", last1->nbo, last1->rnd); |
421 |
if (pro->multiple_ip){ |
422 |
rohc_debugf(2,"Multiple ip-header\n"); |
423 |
rohc_debugf(2,"(udp_decode) nbo2 = %d rnd2 = %d\n", last2->nbo, last2->rnd); |
424 |
} |
425 |
if (memcmp(active1, last1, sizeof(struct s_udp_change)) != 0) { |
426 |
rohc_debugf(0,"(udp_decode) last1 and active1 struct is not synchronized\n"); |
427 |
p = (unsigned char *)last1; |
428 |
for (i = 0; i < sizeof(struct s_udp_change); i++) { |
429 |
printk("%2x ", p[i]); |
430 |
} |
431 |
printk("\nvs\n"); |
432 |
p = (unsigned char *)active1; |
433 |
for (i = 0; i < sizeof(struct s_udp_change); i++) { |
434 |
printk("%2x ", p[i]); |
435 |
} |
436 |
printk("\n"); |
437 |
} |
438 |
if (memcmp(active2, last2, sizeof(struct s_udp_change)) != 0) { |
439 |
rohc_debugf(0,"(udp_decode) last2 and active2 struct is not synchronized\n"); |
440 |
p = (unsigned char *)last2; |
441 |
for (i = 0; i < sizeof(struct s_udp_change); i++) { |
442 |
printk("%2x ", p[i]); |
443 |
} |
444 |
printk("\nvs\n"); |
445 |
p = (unsigned char *)active2; |
446 |
for (i = 0; i < sizeof(struct s_udp_change); i++) { |
447 |
printk("%2x ", p[i]); |
448 |
} |
449 |
printk("\n"); |
450 |
} |
451 |
// ---- DEBUG ---- |
452 |
|
453 |
if (context->state == ROHC_NO_CONTEXT) return ROHC_ERROR; |
454 |
|
455 |
switch(udp_package_type(src)) { |
456 |
case PACKAGE_UO_0: |
457 |
pro->package_type = PACKAGE_UO_0; |
458 |
if (context->state == ROHC_STATIC_CONTEXT) return ROHC_ERROR; |
459 |
return udp_decode_uo0(state, context, src, src + second_byte, |
460 |
dest, size - second_byte); |
461 |
case PACKAGE_UO_1: |
462 |
pro->package_type = PACKAGE_UO_1; |
463 |
if (context->state == ROHC_STATIC_CONTEXT) return ROHC_ERROR; |
464 |
return udp_decode_uo1(state, context, src, src + second_byte, |
465 |
dest, size - second_byte); |
466 |
case PACKAGE_UOR_2: |
467 |
pro->package_type = PACKAGE_UOR_2; |
468 |
return udp_decode_uor2(state, context, src, src + second_byte, |
469 |
dest, size - second_byte); |
470 |
case PACKAGE_IR_DYN: |
471 |
return udp_decode_irdyn(state, context, src, src + second_byte, |
472 |
dest, size - second_byte); |
473 |
default: |
474 |
rohc_debugf(0,"(udp) Unknown package.\n"); |
475 |
return ROHC_ERROR; |
476 |
} |
477 |
} |
478 |
|
479 |
/* Get the reference SN value |
480 |
* |
481 |
*/ |
482 |
static int udp_get_sn(struct sd_context * context) |
483 |
{ |
484 |
struct s_udp_profile_data * pro = context->data; |
485 |
return d_get_lsb_ref(&pro->sn); |
486 |
} |
487 |
|
488 |
static struct s_profile d_udp_profile = {2,"1.0", "UDP / Decompressor", |
489 |
udp_decode, |
490 |
udp_decode_ir, |
491 |
udp_allocate_decode_data, |
492 |
udp_free_decode_data, |
493 |
udp_detect_ir_size, |
494 |
udp_detect_ir_dyn_size, |
495 |
udp_get_sn |
496 |
}; |
497 |
|
498 |
struct s_profile * udp_profile_create() |
499 |
{ |
500 |
return &d_udp_profile; |
501 |
} |
502 |
|
503 |
|
504 |
|
505 |
// --------------------------------------------------------- Package type decoder |
506 |
|
507 |
|
508 |
|
509 |
/* Decode a UO-0 package */ |
510 |
static int udp_decode_uo0( |
511 |
struct sd_rohc * state, |
512 |
struct sd_context * context, |
513 |
unsigned char * head, |
514 |
unsigned char * src, |
515 |
unsigned char * dest, |
516 |
int payload_size |
517 |
) |
518 |
{ |
519 |
unsigned char *saved_src = src; |
520 |
struct s_udp_profile_data * pro = context->data; |
521 |
|
522 |
int multiple_ip = pro->multiple_ip; |
523 |
int id, id2=-1, sn, sn_bits = GET_BIT_3_6(head), sn_size = 4; |
524 |
int calc_crc, real_crc = GET_BIT_0_2(head); |
525 |
int extra_fields = 0, org_payload_size = payload_size; |
526 |
|
527 |
// Do the decoding / find ip-id |
528 |
extra_fields = udp_do_decode_uo0_and_uo1(context, src, dest, &payload_size, sn_bits, sn_size , &id, 0 , &id2, &sn, &calc_crc); |
529 |
|
530 |
if (calc_crc != real_crc) { |
531 |
rohc_debugf(0,"UO-0: CRC failure (calc) %x vs %x (real)\n", |
532 |
calc_crc, real_crc); |
533 |
|
534 |
payload_size = org_payload_size; |
535 |
udp_crc_failure_action(0, context, src, dest, sn_size, &sn, sn_bits, &payload_size, &id, 0, &id2, &calc_crc, &real_crc, 0); |
536 |
return ROHC_ERROR_CRC; |
537 |
} |
538 |
|
539 |
if(pro->counter){ |
540 |
if(pro->counter==1){ |
541 |
|
542 |
rohc_debugf(2,"Throw away packet, just 2 packages right so far\n"); |
543 |
|
544 |
pro->counter++; |
545 |
// Update the inter-packet variable |
546 |
|
547 |
udp_update_packet_time(pro); |
548 |
|
549 |
udp_syncronize(pro); |
550 |
|
551 |
d_lsb_sync_ref(&pro->sn); |
552 |
d_lsb_update(&pro->sn, sn); |
553 |
d_ip_id_update(&pro->ip_id1, id, sn); |
554 |
if (pro->multiple_ip) |
555 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
556 |
|
557 |
return ROHC_ERROR_CRC; |
558 |
|
559 |
}else if(pro->counter==2){ |
560 |
pro->counter = 0; |
561 |
rohc_debugf(2,"The rapair is deemed successful\n"); |
562 |
}else{ |
563 |
rohc_debugf(2,"XX Should not happen XX\n"); |
564 |
} |
565 |
} |
566 |
|
567 |
src += extra_fields; |
568 |
|
569 |
// Update the inter-packet variable |
570 |
udp_update_packet_time(pro); |
571 |
|
572 |
udp_syncronize(pro); |
573 |
|
574 |
// Update lsb and id structs on CRC-success |
575 |
d_lsb_sync_ref(&pro->sn); |
576 |
d_lsb_update(&pro->sn, sn); |
577 |
d_ip_id_update(&pro->ip_id1, id, sn); |
578 |
if (pro->multiple_ip){ |
579 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
580 |
dest += sizeof(struct iphdr); |
581 |
} |
582 |
|
583 |
// Payload |
584 |
dest += sizeof(struct iphdr) + sizeof(struct udphdr); |
585 |
|
586 |
memcpy(dest, src, payload_size); |
587 |
|
588 |
// Statistics: |
589 |
context->header_compressed_size += src - saved_src; |
590 |
c_add_wlsb(context->header_16_compressed, 0,0, src - saved_src); |
591 |
context->header_uncompressed_size += (multiple_ip+1)*sizeof(struct iphdr) + sizeof(struct udphdr); |
592 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (multiple_ip+1)*sizeof(struct iphdr) + sizeof(struct udphdr)); |
593 |
|
594 |
return payload_size + (multiple_ip + 1) * sizeof(struct iphdr)+ sizeof(struct udphdr); |
595 |
} |
596 |
|
597 |
|
598 |
|
599 |
/* Decode a UO-1 package */ |
600 |
static int udp_decode_uo1( |
601 |
struct sd_rohc * state, |
602 |
struct sd_context * context, |
603 |
unsigned char * head, |
604 |
unsigned char * src, |
605 |
unsigned char * dest, |
606 |
int payload_size |
607 |
) |
608 |
{ |
609 |
unsigned char *saved_src = src; |
610 |
struct s_udp_profile_data * pro = context->data; |
611 |
|
612 |
int id = GET_BIT_0_5(head), id2=-1; |
613 |
int sn, sn_bits = GET_BIT_3_7(src), sn_size = 5; |
614 |
int org_payload_size, extra_fields=0; |
615 |
int calc_crc, real_crc = GET_BIT_0_2(src); |
616 |
src++; payload_size--; |
617 |
org_payload_size = payload_size; |
618 |
|
619 |
// Decode the id and sn |
620 |
extra_fields = udp_do_decode_uo0_and_uo1(context, src, dest, &payload_size, sn_bits, sn_size , &id, 6 , &id2, &sn, &calc_crc); |
621 |
|
622 |
if (calc_crc != real_crc) { |
623 |
rohc_debugf(0,"UO-1: CRC failure (calc) %x vs %x (real)\n", |
624 |
calc_crc, real_crc); |
625 |
payload_size = org_payload_size; |
626 |
udp_crc_failure_action(0, context, src, dest, sn_size, &sn, sn_bits, &payload_size, &id, 6, &id2, &calc_crc, &real_crc, 0); |
627 |
return ROHC_ERROR_CRC; |
628 |
} |
629 |
|
630 |
if(pro->counter){ |
631 |
if(pro->counter==1){ |
632 |
|
633 |
rohc_debugf(2,"Throw away packet, just 2 packages right so far\n"); |
634 |
|
635 |
pro->counter++; |
636 |
// Update the inter-packet variable |
637 |
|
638 |
udp_update_packet_time(pro); |
639 |
|
640 |
udp_syncronize(pro); |
641 |
|
642 |
d_lsb_sync_ref(&pro->sn); |
643 |
d_lsb_update(&pro->sn, sn); |
644 |
d_ip_id_update(&pro->ip_id1, id, sn); |
645 |
if (pro->multiple_ip) |
646 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
647 |
|
648 |
|
649 |
return ROHC_ERROR_CRC; |
650 |
|
651 |
}else if(pro->counter==2){ |
652 |
pro->counter = 0; |
653 |
rohc_debugf(2,"The rapair is deemed successful\n"); |
654 |
}else{ |
655 |
rohc_debugf(2,"XX Should not happen XX\n"); |
656 |
} |
657 |
} |
658 |
|
659 |
src += extra_fields; |
660 |
|
661 |
// Update the inter-packet variable |
662 |
udp_update_packet_time(pro); |
663 |
|
664 |
udp_syncronize(pro); |
665 |
|
666 |
d_lsb_sync_ref(&pro->sn); |
667 |
d_lsb_update(&pro->sn, sn); |
668 |
d_ip_id_update(&pro->ip_id1, id, sn); |
669 |
|
670 |
if (pro->multiple_ip){ |
671 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
672 |
dest += sizeof(struct iphdr); |
673 |
} |
674 |
|
675 |
// Payload |
676 |
dest += sizeof(struct iphdr)+ sizeof(struct udphdr); |
677 |
memcpy(dest, src, payload_size); |
678 |
|
679 |
// Statistics: |
680 |
context->header_compressed_size += src - saved_src; |
681 |
c_add_wlsb(context->header_16_compressed, 0,0, src - saved_src); |
682 |
context->header_uncompressed_size += (pro->multiple_ip+1)*sizeof(struct iphdr) + sizeof(struct udphdr); |
683 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (pro->multiple_ip+1)*sizeof(struct iphdr) + sizeof(struct udphdr)); |
684 |
|
685 |
return payload_size + (pro->multiple_ip + 1) * sizeof(struct iphdr) + sizeof(struct udphdr); |
686 |
} |
687 |
|
688 |
|
689 |
/* Decode a UO-2 package */ |
690 |
static int udp_decode_uor2( |
691 |
struct sd_rohc * state, |
692 |
struct sd_context * context, |
693 |
unsigned char * head, |
694 |
unsigned char * src, |
695 |
unsigned char * dest, |
696 |
int payload_size |
697 |
) |
698 |
{ |
699 |
unsigned char *saved_src = src; |
700 |
struct s_udp_profile_data * pro = context->data; |
701 |
|
702 |
int org_payload_size = payload_size, extra_fields = 0; |
703 |
int sn_size = 0; |
704 |
int id = 0, id2 = 0, multiple_id = pro->multiple_ip; |
705 |
int calc_crc = 0; |
706 |
|
707 |
int sn_bits = GET_BIT_0_4(head) , sn = 0; |
708 |
int real_crc = GET_BIT_0_6(src); |
709 |
int ext = GET_BIT_7(src); |
710 |
src++; |
711 |
|
712 |
// Decode |
713 |
extra_fields = udp_do_decode_uor2(state, context, src, dest, &payload_size, &id, &id2, &sn, &sn_size, sn_bits, ext, &calc_crc); |
714 |
|
715 |
|
716 |
if (calc_crc != real_crc) { |
717 |
|
718 |
rohc_debugf(0,"UOR-2: CRC failure (calc) %x vs %x (real)\n", |
719 |
calc_crc, real_crc); |
720 |
|
721 |
payload_size = org_payload_size; |
722 |
id =0 ; id2 = 0; calc_crc = 0; |
723 |
udp_crc_failure_action(state, context, src, dest, sn_size, &sn, sn_bits, &payload_size, &id, 0, &id2, &calc_crc, &real_crc, ext); |
724 |
return ROHC_ERROR_CRC; |
725 |
} |
726 |
|
727 |
if(pro->counter){ |
728 |
if(pro->counter==1){ |
729 |
|
730 |
rohc_debugf(2,"Throw away packet, just 2 packages right so far\n"); |
731 |
|
732 |
pro->counter++; |
733 |
// Update the inter-packet variable |
734 |
|
735 |
udp_update_packet_time(pro); |
736 |
|
737 |
udp_syncronize(pro); |
738 |
|
739 |
d_lsb_sync_ref(&pro->sn); |
740 |
d_lsb_update(&pro->sn, sn); |
741 |
d_ip_id_update(&pro->ip_id1, id, sn); |
742 |
if (pro->multiple_ip) |
743 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
744 |
|
745 |
return ROHC_ERROR_CRC; |
746 |
|
747 |
}else if(pro->counter==2){ |
748 |
pro->counter = 0; |
749 |
rohc_debugf(2,"The rapair is deemed successful\n"); |
750 |
}else{ |
751 |
rohc_debugf(2,"XX Should not happen XX\n"); |
752 |
} |
753 |
} |
754 |
|
755 |
context->state = ROHC_FULL_CONTEXT; |
756 |
src += extra_fields; |
757 |
|
758 |
//if crc success |
759 |
udp_syncronize(pro); |
760 |
|
761 |
// Update the inter-packet variable |
762 |
udp_update_packet_time(pro); |
763 |
|
764 |
// Update |
765 |
d_lsb_sync_ref(&pro->sn); |
766 |
d_lsb_update(&pro->sn, sn); |
767 |
d_ip_id_update(&pro->ip_id1, id, sn); |
768 |
if (pro->multiple_ip){ |
769 |
d_ip_id_update(&pro->ip_id2, id2, sn); |
770 |
dest += sizeof(struct iphdr); |
771 |
} |
772 |
// Payload |
773 |
dest += sizeof(struct iphdr)+ sizeof(struct udphdr); |
774 |
memcpy(dest, src, payload_size); |
775 |
|
776 |
// Statistics: |
777 |
context->header_compressed_size += src - saved_src; |
778 |
c_add_wlsb(context->header_16_compressed, 0,0, src - saved_src); |
779 |
context->header_uncompressed_size += (multiple_id+1)*sizeof(struct iphdr) + sizeof(struct udphdr); |
780 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (multiple_id+1)*sizeof(struct iphdr) + sizeof(struct udphdr)); |
781 |
|
782 |
return payload_size + (multiple_id +1) *sizeof(struct iphdr)+ sizeof(struct udphdr); |
783 |
} |
784 |
|
785 |
/* Decode a IR-Dyn package */ |
786 |
static int udp_decode_irdyn( |
787 |
struct sd_rohc * state, |
788 |
struct sd_context * context, |
789 |
unsigned char * head, |
790 |
unsigned char * src2, |
791 |
unsigned char * dest, |
792 |
int payload_size |
793 |
) |
794 |
{ |
795 |
unsigned char *saved_src = src2; |
796 |
struct s_udp_profile_data * pro = context->data; |
797 |
//struct s_udp_change * last1 = pro->last1; |
798 |
struct s_udp_change * active1 = pro->active1; |
799 |
struct s_udp_change * active2 = pro->active2; |
800 |
int sn = 0, size = d_decode_dynamic_ip4(src2, &active1->ip, &active1->rnd, &active1->nbo); |
801 |
src2 += size; payload_size -= size + 2; |
802 |
|
803 |
if( pro->multiple_ip ){ |
804 |
size = d_decode_dynamic_ip4(src2, &active2->ip, &active2->rnd, &active2->nbo); |
805 |
src2 += size; payload_size -= size; |
806 |
} |
807 |
|
808 |
size = d_decode_dynamic_udp(src2, &active1->udp); |
809 |
src2 += size; payload_size -= size; |
810 |
|
811 |
sn = ntohs(* ((__u16 *)src2)); |
812 |
d_lsb_init(&pro->sn, sn, -1); |
813 |
d_ip_id_init(&pro->ip_id1,ntohs(active1->ip.id), sn); |
814 |
|
815 |
udp_syncronize(pro); |
816 |
|
817 |
// set the checksum flag |
818 |
pro->udp_checksum_present = active1->udp.check; |
819 |
|
820 |
// reset the correction-counter |
821 |
pro->counter = 0; |
822 |
src2 += 2; |
823 |
|
824 |
if (pro->multiple_ip){ |
825 |
d_ip_id_init(&pro->ip_id2,ntohs(active2->ip.id), sn); |
826 |
udp_write_uncompressed_ip4(active1, ntohs(active1->ip.id), dest, payload_size+sizeof(struct iphdr)+sizeof(struct udphdr)); |
827 |
dest += sizeof(struct iphdr); |
828 |
udp_write_uncompressed_ip4(active2, ntohs(active2->ip.id), dest, payload_size + sizeof(struct udphdr)); |
829 |
}else{ |
830 |
udp_write_uncompressed_ip4(active1, ntohs(active1->ip.id), dest, payload_size+ sizeof(struct udphdr)); |
831 |
} |
832 |
|
833 |
context->state = ROHC_FULL_CONTEXT; |
834 |
|
835 |
dest += sizeof(struct iphdr); |
836 |
udp_write_uncompressed_udp(active1, ntohs(active1->udp.check), dest, payload_size); |
837 |
dest += sizeof(struct udphdr); |
838 |
|
839 |
// Update the inter-packet variable |
840 |
udp_update_packet_time(pro); |
841 |
|
842 |
memcpy(dest, src2, payload_size); |
843 |
|
844 |
// Statistics: |
845 |
context->header_compressed_size += src2 - saved_src; |
846 |
c_add_wlsb(context->header_16_compressed, 0,0, src2 - saved_src); |
847 |
context->header_uncompressed_size += (pro->multiple_ip+1)*sizeof(struct iphdr) + sizeof(struct udphdr); |
848 |
c_add_wlsb(context->header_16_uncompressed, 0, 0, (pro->multiple_ip+1)*sizeof(struct iphdr) + sizeof(struct udphdr)); |
849 |
|
850 |
return payload_size + ((pro->multiple_ip)+1) * sizeof(struct iphdr) + sizeof(struct udphdr); |
851 |
} |
852 |
|
853 |
/* decode uo0 and uo1 */ |
854 |
static int udp_do_decode_uo0_and_uo1( |
855 |
struct sd_context * context, |
856 |
unsigned char * src, |
857 |
unsigned char * dest, |
858 |
int * payload_size, |
859 |
int sn_bits, |
860 |
int number_of_sn_bits, |
861 |
int * id, |
862 |
int number_of_id_bits, |
863 |
int * id2, |
864 |
int * sn, |
865 |
int * calc_crc |
866 |
) |
867 |
{ |
868 |
struct s_udp_profile_data * pro = context->data; |
869 |
struct s_udp_change * active1 = pro->active1; |
870 |
struct s_udp_change * active2 = pro->active2; |
871 |
int field_counter = 0; |
872 |
int checksum = 0; |
873 |
|
874 |
*sn = d_lsb_decode(&pro->sn, sn_bits, number_of_sn_bits); |
875 |
|
876 |
if (active1->rnd) { |
877 |
*id = ntohs(*((__u16 *)src)); |
878 |
src += 2; field_counter +=2; *payload_size -= 2; |
879 |
|
880 |
} else { |
881 |
if(number_of_id_bits) |
882 |
*id = d_ip_id_decode(&pro->ip_id1, *id, number_of_id_bits, *sn); |
883 |
else |
884 |
*id = d_ip_id_decode(&pro->ip_id1, 0, 0, *sn); |
885 |
} |
886 |
|
887 |
// If multiple ip header |
888 |
if (pro->multiple_ip){ |
889 |
|
890 |
if (active2->rnd) { |
891 |
*id2 = ntohs(*((__u16 *)src)); |
892 |
|
893 |
src +=2; field_counter +=2; *payload_size -= 2; |
894 |
} else { |
895 |
*id2 = d_ip_id_decode(&pro->ip_id2, 0, 0, *sn); |
896 |
} |
897 |
} |
898 |
// If checksum present |
899 |
if(pro->udp_checksum_present){ |
900 |
rohc_debugf(2,"(decompress) upd checksum present\n"); |
901 |
checksum = ntohs(*((__u16 *)src)); |
902 |
src +=2; field_counter +=2; *payload_size -= 2; |
903 |
} |
904 |
rohc_debugf(2,"(decomp) udp checksum %x payload size = %d\n",checksum,*payload_size); |
905 |
// Header write |
906 |
if (pro->multiple_ip){ |
907 |
udp_write_uncompressed_ip4(active1, *id, dest, *payload_size+sizeof(struct iphdr)+sizeof(struct udphdr)); |
908 |
udp_write_uncompressed_ip4(active2, *id2, dest+sizeof(struct iphdr),*payload_size+sizeof(struct udphdr)); |
909 |
|
910 |
}else{ |
911 |
udp_write_uncompressed_ip4(active1, *id, dest, *payload_size+sizeof(struct udphdr)); |
912 |
} |
913 |
|
914 |
// udp-header write |
915 |
udp_write_uncompressed_ip4(active1, *id, dest, *payload_size+sizeof(struct udphdr)); |
916 |
udp_write_uncompressed_udp(active1, checksum, dest+(pro->multiple_ip + 1) * sizeof(struct iphdr), *payload_size); |
917 |
|
918 |
// Check CRC |
919 |
*calc_crc = crc_calculate(CRC_TYPE_3, dest, (pro->multiple_ip + 1) * sizeof(struct iphdr) +sizeof(struct udphdr)); |
920 |
|
921 |
return field_counter; |
922 |
} |
923 |
|
924 |
/* decode uor2 */ |
925 |
static int udp_do_decode_uor2( |
926 |
struct sd_rohc * state, |
927 |
struct sd_context * context, |
928 |
unsigned char * src2, |
929 |
unsigned char * dest, |
930 |
int * payload_size, |
931 |
int * id, |
932 |
int * id2, |
933 |
int * sn, |
934 |
int * sn_size, |
935 |
int sn_bits, |
936 |
int ext, |
937 |
int * calc_crc |
938 |
) |
939 |
{ |
940 |
struct s_udp_profile_data * pro = context->data; |
941 |
struct s_udp_change * active1 = pro->active1; |
942 |
struct s_udp_change * active2 = pro->active2; |
943 |
int id2_updated = 0, size = 0; |
944 |
int no_ip_id_update = 0; |
945 |
int field_counter = 0; |
946 |
int checksum = 0; |
947 |
|
948 |
*sn = sn_bits; |
949 |
|
950 |
if (ext) { |
951 |
// decode extention |
952 |
switch(udp_extention_type(src2)) { |
953 |
case PACKAGE_EXT_0: |
954 |
size = udp_decode_extention0(src2, sn, id); |
955 |
// ip_id_bits == 3 |
956 |
*sn_size = 8; |
957 |
*sn = d_lsb_decode(&pro->sn, *sn, *sn_size ); |
958 |
*id = d_ip_id_decode(&pro->ip_id1, *id, 3, *sn); |
959 |
*id2 = d_ip_id_decode(&pro->ip_id2, 0, 0, *sn); |
960 |
break; |
961 |
|
962 |
case PACKAGE_EXT_1: |
963 |
size = udp_decode_extention1(src2, sn, id); |
964 |
// ip_id bits == 11 |
965 |
*sn_size = 8; |
966 |
*sn = d_lsb_decode(&pro->sn, *sn, *sn_size ); |
967 |
*id = d_ip_id_decode(&pro->ip_id1, *id, 11, *sn); |
968 |
*id2 = d_ip_id_decode(&pro->ip_id2, 0, 0, *sn); |
969 |
break; |
970 |
|
971 |
case PACKAGE_EXT_2: |
972 |
size = udp_decode_extention2(src2, sn, id, id2); |
973 |
// ip_id bits == 8 |
974 |
*sn_size = 8; |
975 |
*sn = d_lsb_decode(&pro->sn, *sn, *sn_size ); |
976 |
*id2 = d_ip_id_decode(&pro->ip_id1, *id, 8, *sn); |
977 |
*id = d_ip_id_decode(&pro->ip_id2, *id2, 11, *sn); |
978 |
break; |
979 |
|
980 |
case PACKAGE_EXT_3: |
981 |
*sn_size = 5; |
982 |
size = udp_decode_extention3(src2, state, context, sn, |
983 |
sn_size, &no_ip_id_update, &id2_updated); |
984 |
|
985 |
rohc_debugf(2,"(udp_decode) after ext 3 : nbo = %d rnd = %d\n", active1->nbo, active1->rnd); |
986 |
|
987 |
*sn = d_lsb_decode(&pro->sn, *sn, *sn_size ); |
988 |
|
989 |
if (no_ip_id_update) { |
990 |
*id = ntohs(active1->ip.id); |
991 |
} else { |
992 |
*id = d_ip_id_decode(&pro->ip_id1, 0, 0, *sn); |
993 |
} |
994 |
if( pro->multiple_ip ){ |
995 |
rohc_debugf(2,"(udp_decode) after ext 3 : nbo2 = %d rnd2 = %d\n", active2->nbo, active2->rnd); |
996 |
|
997 |
if (id2_updated){ |
998 |
*id2 = ntohs(active2->ip.id); |
999 |
}else |
1000 |
*id2 = d_ip_id_decode(&pro->ip_id2, 0, 0, *sn); |
1001 |
} |
1002 |
break; |
1003 |
} |
1004 |
|
1005 |
|
1006 |
src2 += size; |
1007 |
field_counter +=size; |
1008 |
*payload_size -= size + 1; |
1009 |
} else { |
1010 |
// No extention |
1011 |
*sn_size = 5; |
1012 |
*sn = d_lsb_decode(&pro->sn, *sn , *sn_size); |
1013 |
|
1014 |
*id = d_ip_id_decode(&pro->ip_id1, 0, 0, *sn); |
1015 |
if( pro->multiple_ip) |
1016 |
*id2 = d_ip_id_decode(&pro->ip_id1, 0, 0, *sn); |
1017 |
*payload_size -= 1; |
1018 |
} |
1019 |
|
1020 |
|
1021 |
// Random IP ID ? |
1022 |
if (active1->rnd) { |
1023 |
*id = ntohs(*((__u16 *)src2)); |
1024 |
src2 +=2; field_counter +=2; *payload_size -= 2; |
1025 |
} |
1026 |
|
1027 |
// Multiple ip-header |
1028 |
|
1029 |
if (( pro->multiple_ip )&&( active2->rnd )){ |
1030 |
*id2 = ntohs(*((__u16 *)src2)); |
1031 |
src2 +=2; field_counter +=2; *payload_size -= 2; |
1032 |
} |
1033 |
|
1034 |
// If checksum present |
1035 |
if(pro->udp_checksum_present){ |
1036 |
checksum = ntohs(*((__u16 *)src2)); |
1037 |
src2 +=2; field_counter +=2; *payload_size -= 2; |
1038 |
} |
1039 |
|
1040 |
// Header write |
1041 |
if (pro->multiple_ip){ |
1042 |
udp_write_uncompressed_ip4(active1, *id, dest, *payload_size+sizeof(struct iphdr)+sizeof(struct udphdr)); |
1043 |
udp_write_uncompressed_ip4(active2, *id2, dest+sizeof(struct iphdr),*payload_size+sizeof(struct udphdr)); |
1044 |
}else{ |
1045 |
udp_write_uncompressed_ip4(active1, *id, dest, *payload_size+sizeof(struct udphdr)); |
1046 |
} |
1047 |
|
1048 |
// udp-header write |
1049 |
udp_write_uncompressed_udp(active1, checksum, dest+(pro->multiple_ip + 1) * sizeof(struct iphdr), *payload_size); |
1050 |
|
1051 |
// CRC-check |
1052 |
*calc_crc = crc_calculate(CRC_TYPE_7, dest, (pro->multiple_ip + 1) * sizeof(struct iphdr) + sizeof(struct udphdr)); |
1053 |
|
1054 |
return field_counter; |
1055 |
} |
1056 |
|
1057 |
|
1058 |
|
1059 |
|
1060 |
|
1061 |
// --------------------------------------------------------- |
1062 |
|
1063 |
/* Decode extention 0. |
1064 |
* - SN value is expanded with 3 lower bits |
1065 |
* - IP-ID is replaced with 3 bits |
1066 |
*/ |
1067 |
static int udp_decode_extention0(unsigned char * src, int * sn, int * ip_id) |
1068 |
{ |
1069 |
*sn = *sn << 3 | GET_BIT_3_5(src); |
1070 |
*ip_id = GET_BIT_0_2(src); |
1071 |
return 1; |
1072 |
} |
1073 |
|
1074 |
/* Decode extention 1 |
1075 |
* - SN value is expanded with 3 lower bits |
1076 |
* - IP-ID is replaced with 11 bits |
1077 |
*/ |
1078 |
static int udp_decode_extention1(unsigned char * src, int * sn, int * ip_id) |
1079 |
{ |
1080 |
*sn = *sn << 3 | GET_BIT_3_5(src); |
1081 |
*ip_id = GET_BIT_0_2(src); |
1082 |
|
1083 |
src++; |
1084 |
*ip_id = *ip_id << 8 | *src; |
1085 |
|
1086 |
return 2; |
1087 |
} |
1088 |
|
1089 |
/* Decode extention 2 |
1090 |
* - SN value is expanded with 3 lower bits |
1091 |
* - IP-ID is replaced with 8 bits |
1092 |
*/ |
1093 |
static int udp_decode_extention2(unsigned char * src, int * sn, int * ip_id, int * ip_id2) |
1094 |
{ |
1095 |
|
1096 |
*sn = *sn << 3 | GET_BIT_3_5(src); |
1097 |
*ip_id2 = GET_BIT_0_2(src); |
1098 |
src++; |
1099 |
|
1100 |
*ip_id2 = *ip_id2 << 8 | *src; |
1101 |
src++; |
1102 |
|
1103 |
*ip_id = *src; |
1104 |
return 3; |
1105 |
} |
1106 |
|
1107 |
/* Decode extention 3 |
1108 |
* - Updates random fields in the s_udp_change |
1109 |
* - May update the SN value with 8 lower bits. sn_size is then changed |
1110 |
*/ |
1111 |
static int udp_decode_extention3( |
1112 |
unsigned char * src, |
1113 |
struct sd_rohc * state, |
1114 |
struct sd_context * context, |
1115 |
int * sn, |
1116 |
int * sn_size, |
1117 |
int * ip_id_changed, |
1118 |
int * update_id2 |
1119 |
) |
1120 |
{ |
1121 |
struct s_iponly_profile_data * pro = context->data; |
1122 |
struct s_iponly_change * active1 = pro->active1; |
1123 |
struct s_iponly_change * active2 = pro->active2; |
1124 |
unsigned char * org = src; |
1125 |
unsigned char * fields = src + 1; |
1126 |
int S = GET_BIT_5(src); |
1127 |
int mode = GET_BIT_3_4(src); |
1128 |
int I = GET_BIT_2(src); |
1129 |
int ip = GET_BIT_1(src); |
1130 |
int ip2 = GET_BIT_0(src); |
1131 |
int size; |
1132 |
|
1133 |
src++; |
1134 |
|
1135 |
if (ip) fields++; |
1136 |
if (ip2) fields++; |
1137 |
|
1138 |
if (S) { |
1139 |
*sn = (*sn << 8) + *fields; |
1140 |
*sn_size += 8; |
1141 |
fields++; |
1142 |
} |
1143 |
|
1144 |
if (ip) { |
1145 |
if(pro->multiple_ip){ |
1146 |
size = decode_inner_header_flags(src, fields, &active2->ip, |
1147 |
&active2->rnd, &active2->nbo); |
1148 |
}else |
1149 |
size = udp_decode_inner_header_flags(src, fields, &active1->ip, |
1150 |
&active1->rnd, &active1->nbo); |
1151 |
fields += size; |
1152 |
} |
1153 |
if (I) { |
1154 |
if(pro->multiple_ip){ |
1155 |
active2->ip.id = *((__u16 *)fields); |
1156 |
fields += 2; |
1157 |
*update_id2 = 1; |
1158 |
}else{ |
1159 |
active1->ip.id = *((__u16 *)fields); |
1160 |
fields += 2; |
1161 |
*ip_id_changed = 1; |
1162 |
} |
1163 |
} |
1164 |
if (ip2) { |
1165 |
size = udp_decode_outer_header_flags(src, fields, &active1->ip, |
1166 |
&active1->rnd, &active1->nbo, ip_id_changed ); |
1167 |
fields += size; |
1168 |
|
1169 |
} |
1170 |
|
1171 |
if(mode != context->mode){ |
1172 |
rohc_debugf(2,"mode is not equal on decomp and comp.\n"); |
1173 |
d_change_mode_feedback(state, context); |
1174 |
} |
1175 |
return fields - org; |
1176 |
} |
1177 |
|
1178 |
// --------------------------------------------------------- Local utils functions |
1179 |
|
1180 |
// Deceide what package type |
1181 |
static int udp_package_type(const unsigned char * p) |
1182 |
{ |
1183 |
if (!GET_BIT_7(p)) { |
1184 |
return PACKAGE_UO_0; |
1185 |
} else if (!GET_BIT_6(p)) { |
1186 |
return PACKAGE_UO_1; |
1187 |
} else if (GET_BIT_5_7(p) == 6) { |
1188 |
return PACKAGE_UOR_2; |
1189 |
} else if (*p == 0xf8) { |
1190 |
return PACKAGE_IR_DYN; |
1191 |
} else if ( (*p & 0xfe) == 0xfc) { |
1192 |
return PACKAGE_IR; |
1193 |
} else { |
1194 |
return PACKAGE_UNKNOWN; |
1195 |
} |
1196 |
} |
1197 |
|
1198 |
// Copy the active-structs to last-structs. |
1199 |
void udp_syncronize(struct s_udp_profile_data * pro) |
1200 |
{ |
1201 |
memcpy(pro->last1, pro->active1, sizeof(struct s_udp_change)); |
1202 |
memcpy(pro->last2, pro->active2, sizeof(struct s_udp_change)); |
1203 |
} |
1204 |
|
1205 |
// Copy the last-structs to the active-structs. |
1206 |
void udp_sync_on_failure(struct s_udp_profile_data * pro) |
1207 |
{ |
1208 |
memcpy(pro->active1, pro->last1, sizeof(struct s_udp_change)); |
1209 |
memcpy(pro->active2, pro->last2, sizeof(struct s_udp_change)); |
1210 |
} |
1211 |
|
1212 |
|
1213 |
|
1214 |
// Deceide the extention type |
1215 |
static int udp_extention_type(const unsigned char * p) |
1216 |
{ |
1217 |
return GET_BIT_6_7(p); |
1218 |
} |
1219 |
|
1220 |
/* Decode inner IP flags and fields. Storage the values |
1221 |
* in a IP-head struct. |
1222 |
*/ |
1223 |
static int udp_decode_inner_header_flags( |
1224 |
unsigned char * flags, |
1225 |
unsigned char * fields, |
1226 |
struct iphdr * ip, |
1227 |
int * rnd, int * nbo) |
1228 |
{ |
1229 |
int size = 0; |
1230 |
if (GET_BIT_7(flags)) { |
1231 |
ip->tos = *fields; |
1232 |
fields++; size++; |
1233 |
} |
1234 |
if (GET_BIT_6(flags)) { |
1235 |
ip->ttl = *fields; |
1236 |
fields++; size++; |
1237 |
} |
1238 |
if (GET_BIT_5(flags)) { |
1239 |
ip->frag_off = htons(IP_DF); |
1240 |
} else { |
1241 |
ip->frag_off = 0; |
1242 |
} |
1243 |
if (GET_BIT_4(flags)) { |
1244 |
ip->protocol = *fields; |
1245 |
fields++; size++; |
1246 |
} |
1247 |
if (GET_BIT_3(flags)) { |
1248 |
// TODO, list compression |
1249 |
rohc_debugf(0,"Listcompression is not supported\n"); |
1250 |
} |
1251 |
*nbo = GET_BIT_2(flags); |
1252 |
*rnd = GET_BIT_1(flags); |
1253 |
return size; |
1254 |
} |
1255 |
|
1256 |
/* Decode outer IP flags and fields. Storage the values |
1257 |
* in a IP-head struct. |
1258 |
*/ |
1259 |
static int udp_decode_outer_header_flags( |
1260 |
unsigned char * flags, |
1261 |
unsigned char * fields, |
1262 |
struct iphdr * ip, |
1263 |
int * rnd, int * nbo, |
1264 |
int * updated_id) |
1265 |
{ |
1266 |
int size = 0; |
1267 |
if (GET_BIT_7(flags)) { |
1268 |
ip->tos = *fields; |
1269 |
fields++; size++; |
1270 |
} |
1271 |
if (GET_BIT_6(flags)) { |
1272 |
ip->ttl = *fields; |
1273 |
fields++; size++; |
1274 |
} |
1275 |
if (GET_BIT_5(flags)) { |
1276 |
ip->frag_off = htons(IP_DF); |
1277 |
} else { |
1278 |
ip->frag_off = 0; |
1279 |
} |
1280 |
if (GET_BIT_4(flags)) { |
1281 |
ip->protocol = *fields; |
1282 |
fields++; size++; |
1283 |
} |
1284 |
if (GET_BIT_3(flags)) { |
1285 |
// TODO, list compression |
1286 |
rohc_debugf(0,"Listcompression is not supported\n"); |
1287 |
} |
1288 |
*nbo = GET_BIT_2(flags); |
1289 |
*rnd = GET_BIT_1(flags); |
1290 |
|
1291 |
if (GET_BIT_0(flags)) { |
1292 |
ip->id = *((__u16 *)fields); |
1293 |
fields += 2; size += 2; |
1294 |
*updated_id = 1; |
1295 |
} |
1296 |
return size; |
1297 |
} |
1298 |
|
1299 |
/* Write a uncompressed IP v4 header */ |
1300 |
static void udp_write_uncompressed_ip4( |
1301 |
struct s_udp_change * active, |
1302 |
int ip_id, |
1303 |
unsigned char * dest, |
1304 |
int payload_size |
1305 |
) |
1306 |
{ |
1307 |
struct iphdr * ip = (struct iphdr *)dest; |
1308 |
|
1309 |
// --- static & some changing |
1310 |
memcpy(dest, &active->ip, sizeof(struct iphdr)); |
1311 |
|
1312 |
// --- ip-id |
1313 |
ip->id = htons(ip_id); |
1314 |
if (!active->nbo) ip->id = __swab16(ip->id); |
1315 |
|
1316 |
//--- Static-known fields |
1317 |
ip->ihl = 5; |
1318 |
|
1319 |
//--- Interfered fields |
1320 |
ip->tot_len = htons(payload_size + (ip->ihl * 4)); |
1321 |
ip->check = 0; |
1322 |
ip->check = ip_fast_csum(dest, ip->ihl); |
1323 |
} |
1324 |
|
1325 |
/* Write a uncompressed UDP header */ |
1326 |
static void udp_write_uncompressed_udp( |
1327 |
struct s_udp_change * active, |
1328 |
int checksum, |
1329 |
unsigned char * dest, |
1330 |
int payload_size |
1331 |
) |
1332 |
{ |
1333 |
struct udphdr * udp = (struct udphdr *)dest; |
1334 |
|
1335 |
// --- static & some changing |
1336 |
memcpy(dest, &active->udp, sizeof(struct udphdr)); |
1337 |
|
1338 |
// --- udp-checksum |
1339 |
udp->check = htons(checksum); |
1340 |
if (!active->nbo) udp->check = __swab16(udp->check); |
1341 |
|
1342 |
//--- Interfered fields |
1343 |
udp->len = htons(payload_size + sizeof(struct udphdr)); |
1344 |
|
1345 |
} |
1346 |
|
1347 |
/* This function try to repair the SN in one of two different ways |
1348 |
* |
1349 |
*/ |
1350 |
static int udp_crc_failure_action( |
1351 |
struct sd_rohc * state, |
1352 |
struct sd_context * context, |
1353 |
unsigned char * src, |
1354 |
unsigned char * dest, |
1355 |
int sn_size, |
1356 |
int * sn, |
1357 |
int sn_bits, |
1358 |
int * payload_size, |
1359 |
int * id, |
1360 |
int id_size, |
1361 |
int * id2, |
1362 |
int * calc_crc, |
1363 |
int * real_crc, |
1364 |
int ext |
1365 |
) |
1366 |
{ |
1367 |
struct s_udp_profile_data * pro = context->data; |
1368 |
|
1369 |
int sn_ref = 0, intervall = 0; |
1370 |
int sn_curr2 = 0, sn_curr1 = 0; |
1371 |
int sn_update = 0; |
1372 |
|
1373 |
udp_sync_on_failure(pro); |
1374 |
|
1375 |
if(CRC_ACTION){ |
1376 |
rohc_debugf(0,"Try to repair the CRC\n"); |
1377 |
|
1378 |
if(pro->last_packet_time) //if last packettime == 0 then IR was just sent and ... |
1379 |
intervall = pro->current_packet_time - pro->last_packet_time; |
1380 |
|
1381 |
|
1382 |
if(intervall > ((1 << sn_size)*(pro->inter_arrival_time))){ |
1383 |
rohc_debugf(0,"ROHC: repair with the assumption: SN LSB wraparound\n"); |
1384 |
rohc_debugf(2,"inter_arrival_time = %d and current intervall is = %d\n", pro->inter_arrival_time, intervall); |
1385 |
rohc_debugf(2,"add %d to SN\n", 1 << sn_size); |
1386 |
|
1387 |
// Try and update the SN |
1388 |
sn_ref = d_get_lsb_ref(&pro->sn); |
1389 |
sn_ref += (1 << sn_size); |
1390 |
d_lsb_sync_ref(&pro->sn); |
1391 |
d_lsb_update(&pro->sn, sn_ref); |
1392 |
*sn = d_lsb_decode(&pro->sn, sn_bits, sn_size ); |
1393 |
|
1394 |
pro->counter = 0; |
1395 |
|
1396 |
}else{ |
1397 |
// try with the old sn_ref value |
1398 |
|
1399 |
rohc_debugf(0,"ROHC: repair with the assumption: incorrect SN-updates\n"); |
1400 |
|
1401 |
// save current referece value |
1402 |
sn_curr1 = d_get_lsb_ref(&pro->sn); |
1403 |
// test with old reference value |
1404 |
d_lsb_update(&pro->sn, d_get_lsb_old_ref(&pro->sn)); |
1405 |
|
1406 |
sn_curr2 = d_lsb_decode(&pro->sn, sn_bits, sn_size ); |
1407 |
|
1408 |
if( sn_curr2 == *sn) |
1409 |
return ROHC_ERROR_CRC; |
1410 |
//*sn = sn_curr2; |
1411 |
d_lsb_update(&pro->sn, sn_curr2); |
1412 |
sn_update = 1; |
1413 |
pro->counter = 0; |
1414 |
} |
1415 |
|
1416 |
// Try a new decompression with another SN |
1417 |
switch (pro->package_type){ |
1418 |
case PACKAGE_UO_0: |
1419 |
//fall through |
1420 |
case PACKAGE_UO_1: |
1421 |
udp_do_decode_uo0_and_uo1(context, src, dest, payload_size, sn_bits, sn_size , id, id_size, id2, sn, calc_crc); |
1422 |
break; |
1423 |
case PACKAGE_UOR_2: |
1424 |
*sn = sn_bits; |
1425 |
udp_do_decode_uor2(state, context, src, dest, payload_size, id, id2, sn, &sn_size, sn_bits, ext, calc_crc); |
1426 |
break; |
1427 |
default: |
1428 |
rohc_debugf(0,"(Ip-only) A existing packet?\n"); |
1429 |
d_lsb_update(&pro->sn, sn_curr1); |
1430 |
return ROHC_ERROR_CRC; |
1431 |
} |
1432 |
|
1433 |
if (*calc_crc != *real_crc){ |
1434 |
rohc_debugf(0,"ROHC: CRC failure also on the second attempt (calc) %x vs %x (real)\n",*calc_crc, *real_crc); |
1435 |
pro->counter = 0; |
1436 |
if(sn_update) |
1437 |
d_lsb_update(&pro->sn, sn_curr1); //reference curr1 should be used |
1438 |
udp_sync_on_failure(pro); |
1439 |
return ROHC_ERROR_CRC; |
1440 |
|
1441 |
}//CRC-pass |
1442 |
|
1443 |
|
1444 |
rohc_debugf(2,"Update and sync with the new SN then throw away the packet\n"); |
1445 |
pro->counter++; |
1446 |
udp_update_packet_time(pro); |
1447 |
|
1448 |
udp_syncronize(pro); |
1449 |
if(!sn_update){ |
1450 |
d_lsb_sync_ref(&pro->sn); |
1451 |
d_lsb_update(&pro->sn, *sn); |
1452 |
}else |
1453 |
d_lsb_update(&pro->sn, sn_curr2); |
1454 |
|
1455 |
d_ip_id_update(&pro->ip_id1, *id, *sn); |
1456 |
if (pro->multiple_ip) |
1457 |
d_ip_id_update(&pro->ip_id2, *id2, *sn); |
1458 |
|
1459 |
return ROHC_ERROR_CRC; |
1460 |
|
1461 |
}else{ |
1462 |
return ROHC_ERROR_CRC; |
1463 |
} |
1464 |
} |
1465 |
|
1466 |
/* Update the inter-packet time, a sort of averange over the last inter-packet times */ |
1467 |
static void udp_update_packet_time(struct s_udp_profile_data * pro) |
1468 |
{ |
1469 |
int last_time = pro->last_packet_time; |
1470 |
int delta = 0; |
1471 |
rohc_debugf(2,"current time = %d and last time = %d\n", pro->current_packet_time, last_time); |
1472 |
|
1473 |
if (last_time) |
1474 |
delta = pro->current_packet_time - last_time; |
1475 |
pro->last_packet_time = pro->current_packet_time; |
1476 |
if (pro->inter_arrival_time){ |
1477 |
pro->inter_arrival_time = (pro->inter_arrival_time >> WEIGHT_OLD) + (delta >> WEIGHT_NEW); |
1478 |
|
1479 |
} else |
1480 |
pro->inter_arrival_time = delta; |
1481 |
|
1482 |
rohc_debugf(2,"inter_arrival_time = %d and current arrival delta is = %d\n", pro->inter_arrival_time, delta); |
1483 |
} |