linux/net/batman-adv/gateway_common.c
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   1/* Copyright (C) 2009-2012 B.A.T.M.A.N. contributors:
   2 *
   3 * Marek Lindner
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of version 2 of the GNU General Public
   7 * License as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful, but
  10 * WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12 * General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17 * 02110-1301, USA
  18 */
  19
  20#include "main.h"
  21#include "gateway_common.h"
  22#include "gateway_client.h"
  23
  24/* calculates the gateway class from kbit */
  25static void batadv_kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class)
  26{
  27        int mdown = 0, tdown, tup, difference;
  28        uint8_t sbit, part;
  29
  30        *gw_srv_class = 0;
  31        difference = 0x0FFFFFFF;
  32
  33        /* test all downspeeds */
  34        for (sbit = 0; sbit < 2; sbit++) {
  35                for (part = 0; part < 16; part++) {
  36                        tdown = 32 * (sbit + 2) * (1 << part);
  37
  38                        if (abs(tdown - down) < difference) {
  39                                *gw_srv_class = (sbit << 7) + (part << 3);
  40                                difference = abs(tdown - down);
  41                                mdown = tdown;
  42                        }
  43                }
  44        }
  45
  46        /* test all upspeeds */
  47        difference = 0x0FFFFFFF;
  48
  49        for (part = 0; part < 8; part++) {
  50                tup = ((part + 1) * (mdown)) / 8;
  51
  52                if (abs(tup - up) < difference) {
  53                        *gw_srv_class = (*gw_srv_class & 0xF8) | part;
  54                        difference = abs(tup - up);
  55                }
  56        }
  57}
  58
  59/* returns the up and downspeeds in kbit, calculated from the class */
  60void batadv_gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up)
  61{
  62        int sbit = (gw_srv_class & 0x80) >> 7;
  63        int dpart = (gw_srv_class & 0x78) >> 3;
  64        int upart = (gw_srv_class & 0x07);
  65
  66        if (!gw_srv_class) {
  67                *down = 0;
  68                *up = 0;
  69                return;
  70        }
  71
  72        *down = 32 * (sbit + 2) * (1 << dpart);
  73        *up = ((upart + 1) * (*down)) / 8;
  74}
  75
  76static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff,
  77                                      int *up, int *down)
  78{
  79        int ret, multi = 1;
  80        char *slash_ptr, *tmp_ptr;
  81        long ldown, lup;
  82
  83        slash_ptr = strchr(buff, '/');
  84        if (slash_ptr)
  85                *slash_ptr = 0;
  86
  87        if (strlen(buff) > 4) {
  88                tmp_ptr = buff + strlen(buff) - 4;
  89
  90                if (strnicmp(tmp_ptr, "mbit", 4) == 0)
  91                        multi = 1024;
  92
  93                if ((strnicmp(tmp_ptr, "kbit", 4) == 0) ||
  94                    (multi > 1))
  95                        *tmp_ptr = '\0';
  96        }
  97
  98        ret = kstrtol(buff, 10, &ldown);
  99        if (ret) {
 100                batadv_err(net_dev,
 101                           "Download speed of gateway mode invalid: %s\n",
 102                           buff);
 103                return false;
 104        }
 105
 106        *down = ldown * multi;
 107
 108        /* we also got some upload info */
 109        if (slash_ptr) {
 110                multi = 1;
 111
 112                if (strlen(slash_ptr + 1) > 4) {
 113                        tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1);
 114
 115                        if (strnicmp(tmp_ptr, "mbit", 4) == 0)
 116                                multi = 1024;
 117
 118                        if ((strnicmp(tmp_ptr, "kbit", 4) == 0) ||
 119                            (multi > 1))
 120                                *tmp_ptr = '\0';
 121                }
 122
 123                ret = kstrtol(slash_ptr + 1, 10, &lup);
 124                if (ret) {
 125                        batadv_err(net_dev,
 126                                   "Upload speed of gateway mode invalid: %s\n",
 127                                   slash_ptr + 1);
 128                        return false;
 129                }
 130
 131                *up = lup * multi;
 132        }
 133
 134        return true;
 135}
 136
 137ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff,
 138                                size_t count)
 139{
 140        struct batadv_priv *bat_priv = netdev_priv(net_dev);
 141        long gw_bandwidth_tmp = 0;
 142        int up = 0, down = 0;
 143        bool ret;
 144
 145        ret = batadv_parse_gw_bandwidth(net_dev, buff, &up, &down);
 146        if (!ret)
 147                goto end;
 148
 149        if ((!down) || (down < 256))
 150                down = 2000;
 151
 152        if (!up)
 153                up = down / 5;
 154
 155        batadv_kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp);
 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        batadv_gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp, &down, &up);
 162
 163        if (atomic_read(&bat_priv->gw_bandwidth) == gw_bandwidth_tmp)
 164                return count;
 165
 166        batadv_gw_deselect(bat_priv);
 167        batadv_info(net_dev,
 168                    "Changing gateway bandwidth from: '%i' to: '%ld' (propagating: %d%s/%d%s)\n",
 169                    atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp,
 170                    (down > 2048 ? down / 1024 : down),
 171                    (down > 2048 ? "MBit" : "KBit"),
 172                    (up > 2048 ? up / 1024 : up),
 173                    (up > 2048 ? "MBit" : "KBit"));
 174
 175        atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp);
 176
 177end:
 178        return count;
 179}
 180
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