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protocol.c
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protocol.c
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/*
* Proof-of-concept driver for Samsung SWC-U200 wimax dongle.
* This file contains binary protocol realization.
* Copyright (C) 2008 Alexander Gordeev <lasaine@lvk.cs.msu.su>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include "protocol.h"
static int process_normal_C_response(struct wimax_dev_status *dev, const unsigned char *buf, int len)
{
short type_a = (buf[0x14] << 8) + buf[0x15];
short type_b = (buf[0x16] << 8) + buf[0x17];
short param_len = (buf[0x18] << 8) + buf[0x19];
if (type_a == 0x8 && type_b == 0x2) {
if (param_len != 0x80) {
debug_msg(0, "bad param_len\n");
return -1;
}
memcpy(dev->chip, buf + 0x1a, 0x40);
memcpy(dev->firmware, buf + 0x5a, 0x40);
dev->info_updated |= WDS_CHIP | WDS_FIRMWARE;
return 0;
}
if (type_a == 0x3 && type_b == 0x2) {
if (param_len != 0x6) {
debug_msg(0, "bad param_len\n");
return -1;
}
memcpy(dev->mac, buf + 0x1a, 0x6);
dev->info_updated |= WDS_MAC;
return 0;
}
if (type_a == 0x1 && type_b == 0x2) {
if (param_len != 0x2) {
debug_msg(0, "bad param_len\n");
return -1;
}
dev->net_found = (buf[0x1a] << 8) + buf[0x1b];
dev->info_updated |= WDS_NET_FOUND;
return 0;
}
if (type_a == 0x1 && type_b == 0x3) {
if (param_len != 0x4) {
debug_msg(0, "bad param_len\n");
return -1;
}
dev->net_found = 0;
dev->info_updated |= WDS_NET_FOUND;
return 0;
}
if (type_a == 0x1 && type_b == 0xa) {
if (param_len != 0x16) {
debug_msg(0, "bad param_len\n");
return -1;
}
dev->rssi = (buf[0x1a] << 8) + buf[0x1b];
dev->cinr = (float)((short)((buf[0x1c] << 8) + buf[0x1d])) / 8;
memcpy(dev->bsid, buf + 0x1e, 0x6);
dev->txpwr = (buf[0x26] << 8) + buf[0x27];
dev->freq = (buf[0x28] << 24) + (buf[0x29] << 16) + (buf[0x2a] << 8) + buf[0x2b];
dev->info_updated |= WDS_RSSI | WDS_CINR | WDS_BSID | WDS_TXPWR | WDS_FREQ;
return 0;
}
if (type_a == 0x1 && type_b == 0xc) {
if (param_len != 0x2) {
debug_msg(0, "bad param_len\n");
return -1;
}
dev->state = (buf[0x1a] << 8) + buf[0x1b];
dev->info_updated |= WDS_STATE;
return 0;
}
dev->info_updated |= WDS_OTHER;
return 0;
}
static int process_debug_C_response(struct wimax_dev_status *dev, const unsigned char *buf, int len)
{
return 0;
}
static int process_C_response(struct wimax_dev_status *dev, const unsigned char *buf, int len)
{
if (buf[0x12] != 0x15) {
debug_msg(0, "bad format\n");
return -1;
}
switch (buf[0x13]) {
case 0x00:
return process_normal_C_response(dev, buf, len);
case 0x02:
return process_debug_C_response(dev, buf, len);
case 0x04:
break;
default:
debug_msg(0, "bad format\n");
return -1;
}
return 0;
}
static int process_D_response(struct wimax_dev_status *dev, const unsigned char *buf, int len)
{
write_netif(buf + 0x06, len - 0x06);
return 0;
}
static int process_E_response(struct wimax_dev_status *dev, const unsigned char *buf, int len)
{
return 0;
}
static int process_P_response(struct wimax_dev_status *dev, const unsigned char *buf, int len)
{
return 0;
}
int process_response(struct wimax_dev_status *dev, const unsigned char *buf, int len)
{
int check_len;
if(len < 4) {
debug_msg(0, "short read\n");
return -1;
}
if(buf[0] != 0x57) {
debug_msg(0, "bad header\n");
return -1;
}
check_len = 4 + buf[2] + (buf[3] << 8);
if(buf[1] == 0x43 || buf[1] == 0x44) {
check_len += 2;
}
if(check_len != len) {
debug_msg(0, "bad length: %02x instead of %02x\n", check_len, len);
return -1;
}
switch (buf[1]) {
case 0x43:
return process_C_response(dev, buf, len);
case 0x44:
return process_D_response(dev, buf, len);
case 0x45:
return process_E_response(dev, buf, len);
case 0x50:
return process_P_response(dev, buf, len);
default:
debug_msg(0, "bad response type: %02x\n", buf[1]);
return -1;
}
}
static void fill_C_req(unsigned char *buf, int len)
{
len -= 6;
buf[0x00] = 0x57;
buf[0x01] = 0x43;
buf[0x02] = len & 0xff;
buf[0x03] = (len >> 8) & 0xff;
memset(buf + 6, 0, 12);
}
static int fill_normal_C_req(unsigned char *buf, unsigned short type_a, unsigned short type_b, unsigned short param_len, unsigned char *param)
{
int len = 0x1a + param_len;
fill_C_req(buf, len);
buf[0x04] = 0x15;
buf[0x05] = 0x00;
buf[0x12] = 0x15;
buf[0x13] = 0x00;
buf[0x14] = type_a >> 8;
buf[0x15] = type_a & 0xff;
buf[0x16] = type_b >> 8;
buf[0x17] = type_b & 0xff;
buf[0x18] = param_len >> 8;
buf[0x19] = param_len & 0xff;
memcpy(buf + 0x1a, param, param_len);
return len;
}
int fill_string_info_req(unsigned char *buf, int len)
{
return fill_normal_C_req(buf, 0x8, 0x1, 0x0, NULL);
}
int fill_init1_req(unsigned char *buf, int len)
{
unsigned char param[0x2] = {0x0, 0x1};
return fill_normal_C_req(buf, 0x30, 0x1, sizeof(param), param);
}
int fill_mac_req(unsigned char *buf, int len)
{
return fill_normal_C_req(buf, 0x3, 0x1, 0x0, NULL);
}
int fill_init2_req(unsigned char *buf, int len)
{
return fill_normal_C_req(buf, 0x20, 0x8, 0x0, NULL);
}
int fill_init3_req(unsigned char *buf, int len)
{
return fill_normal_C_req(buf, 0x20, 0xc, 0x0, NULL);
}
int fill_authorization_data_req(unsigned char *buf, int len)
{
unsigned char param[0xd] = {0x00, 0x10, 0x00, 0x09, 0x40, 0x79, 0x6f, 0x74, 0x61, 0x2e, 0x72, 0x75, 0x00};
return fill_normal_C_req(buf, 0x20, 0x20, sizeof(param), param);
}
int fill_find_network_req(unsigned char *buf, int len, unsigned short level)
{
unsigned char param[0x2] = {level >> 8, level & 0xff};
return fill_normal_C_req(buf, 0x1, 0x1, sizeof(param), param);
}
int fill_connection_params1_req(unsigned char *buf, int len)
{
unsigned char param[0x2] = {0xff, 0xff};
return fill_normal_C_req(buf, 0x1, 0x9, sizeof(param), param);
}
int fill_connection_params2_req(unsigned char *buf, int len)
{
unsigned char param[0x2] = {0x00, 0x00};
return fill_normal_C_req(buf, 0x1, 0x9, sizeof(param), param);
}
int fill_state_req(unsigned char *buf, int len)
{
return fill_normal_C_req(buf, 0x1, 0xb, 0x0, NULL);
}
int get_D_header_len()
{
return 6;
}
int fill_outgoing_packet_header(unsigned char *buf, int len, int body_len)
{
buf[0x00] = 0x57;
buf[0x01] = 0x44;
buf[0x02] = body_len & 0xff;
buf[0x03] = (body_len >> 8) & 0xff;
return body_len + 6;
}