1 /* 2 * Copyright (C) 2009-2010 B.A.T.M.A.N. contributors: 3 * 4 * Marek Lindner 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of version 2 of the GNU General Public 8 * License as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA 19 * 20 */ 21 22 #include "main.h" 23 #include "gateway_common.h" 24 #include "gateway_client.h" 25 26 /* calculates the gateway class from kbit */ 27 static void kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class) 28 { 29 int mdown = 0, tdown, tup, difference; 30 uint8_t sbit, part; 31 32 *gw_srv_class = 0; 33 difference = 0x0FFFFFFF; 34 35 /* test all downspeeds */ 36 for (sbit = 0; sbit < 2; sbit++) { 37 for (part = 0; part < 16; part++) { 38 tdown = 32 * (sbit + 2) * (1 << part); 39 40 if (abs(tdown - down) < difference) { 41 *gw_srv_class = (sbit << 7) + (part << 3); 42 difference = abs(tdown - down); 43 mdown = tdown; 44 } 45 } 46 } 47 48 /* test all upspeeds */ 49 difference = 0x0FFFFFFF; 50 51 for (part = 0; part < 8; part++) { 52 tup = ((part + 1) * (mdown)) / 8; 53 54 if (abs(tup - up) < difference) { 55 *gw_srv_class = (*gw_srv_class & 0xF8) | part; 56 difference = abs(tup - up); 57 } 58 } 59 } 60 61 /* returns the up and downspeeds in kbit, calculated from the class */ 62 void gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up) 63 { 64 char sbit = (gw_srv_class & 0x80) >> 7; 65 char dpart = (gw_srv_class & 0x78) >> 3; 66 char upart = (gw_srv_class & 0x07); 67 68 if (!gw_srv_class) { 69 *down = 0; 70 *up = 0; 71 return; 72 } 73 74 *down = 32 * (sbit + 2) * (1 << dpart); 75 *up = ((upart + 1) * (*down)) / 8; 76 } 77 78 static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff, 79 long *up, long *down) 80 { 81 int ret, multi = 1; 82 char *slash_ptr, *tmp_ptr; 83 84 slash_ptr = strchr(buff, '/'); 85 if (slash_ptr) 86 *slash_ptr = 0; 87 88 if (strlen(buff) > 4) { 89 tmp_ptr = buff + strlen(buff) - 4; 90 91 if (strnicmp(tmp_ptr, "mbit", 4) == 0) 92 multi = 1024; 93 94 if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || 95 (multi > 1)) 96 *tmp_ptr = '\0'; 97 } 98 99 ret = strict_strtoul(buff, 10, down); 100 if (ret) { 101 bat_err(net_dev, 102 "Download speed of gateway mode invalid: %s\n", 103 buff); 104 return false; 105 } 106 107 *down *= multi; 108 109 /* we also got some upload info */ 110 if (slash_ptr) { 111 multi = 1; 112 113 if (strlen(slash_ptr + 1) > 4) { 114 tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1); 115 116 if (strnicmp(tmp_ptr, "mbit", 4) == 0) 117 multi = 1024; 118 119 if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || 120 (multi > 1)) 121 *tmp_ptr = '\0'; 122 } 123 124 ret = strict_strtoul(slash_ptr + 1, 10, up); 125 if (ret) { 126 bat_err(net_dev, 127 "Upload speed of gateway mode invalid: " 128 "%s\n", slash_ptr + 1); 129 return false; 130 } 131 132 *up *= multi; 133 } 134 135 return true; 136 } 137 138 ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count) 139 { 140 struct bat_priv *bat_priv = netdev_priv(net_dev); 141 long gw_bandwidth_tmp = 0, up = 0, down = 0; 142 bool ret; 143 144 ret = parse_gw_bandwidth(net_dev, buff, &up, &down); 145 if (!ret) 146 goto end; 147 148 if ((!down) || (down < 256)) 149 down = 2000; 150 151 if (!up) 152 up = down / 5; 153 154 kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp); 155 156 /** 157 * the gw bandwidth we guessed above might not match the given 158 * speeds, hence we need to calculate it back to show the number 159 * that is going to be propagated 160 **/ 161 gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp, 162 (int *)&down, (int *)&up); 163 164 gw_deselect(bat_priv); 165 bat_info(net_dev, "Changing gateway bandwidth from: '%i' to: '%ld' " 166 "(propagating: %ld%s/%ld%s)\n", 167 atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp, 168 (down > 2048 ? down / 1024 : down), 169 (down > 2048 ? "MBit" : "KBit"), 170 (up > 2048 ? up / 1024 : up), 171 (up > 2048 ? "MBit" : "KBit")); 172 173 atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp); 174 175 end: 176 return count; 177 } 178