diff options
Diffstat (limited to 'net/batman-adv/gateway_common.c')
| -rw-r--r-- | net/batman-adv/gateway_common.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c new file mode 100644 index 00000000..ca57ac7d --- /dev/null +++ b/net/batman-adv/gateway_common.c @@ -0,0 +1,178 @@ +/* + * Copyright (C) 2009-2012 B.A.T.M.A.N. contributors: + * + * Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +#include "main.h" +#include "gateway_common.h" +#include "gateway_client.h" + +/* calculates the gateway class from kbit */ +static void kbit_to_gw_bandwidth(int down, int up, long *gw_srv_class) +{ + int mdown = 0, tdown, tup, difference; + uint8_t sbit, part; + + *gw_srv_class = 0; + difference = 0x0FFFFFFF; + + /* test all downspeeds */ + for (sbit = 0; sbit < 2; sbit++) { + for (part = 0; part < 16; part++) { + tdown = 32 * (sbit + 2) * (1 << part); + + if (abs(tdown - down) < difference) { + *gw_srv_class = (sbit << 7) + (part << 3); + difference = abs(tdown - down); + mdown = tdown; + } + } + } + + /* test all upspeeds */ + difference = 0x0FFFFFFF; + + for (part = 0; part < 8; part++) { + tup = ((part + 1) * (mdown)) / 8; + + if (abs(tup - up) < difference) { + *gw_srv_class = (*gw_srv_class & 0xF8) | part; + difference = abs(tup - up); + } + } +} + +/* returns the up and downspeeds in kbit, calculated from the class */ +void gw_bandwidth_to_kbit(uint8_t gw_srv_class, int *down, int *up) +{ + int sbit = (gw_srv_class & 0x80) >> 7; + int dpart = (gw_srv_class & 0x78) >> 3; + int upart = (gw_srv_class & 0x07); + + if (!gw_srv_class) { + *down = 0; + *up = 0; + return; + } + + *down = 32 * (sbit + 2) * (1 << dpart); + *up = ((upart + 1) * (*down)) / 8; +} + +static bool parse_gw_bandwidth(struct net_device *net_dev, char *buff, + int *up, int *down) +{ + int ret, multi = 1; + char *slash_ptr, *tmp_ptr; + long ldown, lup; + + slash_ptr = strchr(buff, '/'); + if (slash_ptr) + *slash_ptr = 0; + + if (strlen(buff) > 4) { + tmp_ptr = buff + strlen(buff) - 4; + + if (strnicmp(tmp_ptr, "mbit", 4) == 0) + multi = 1024; + + if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || + (multi > 1)) + *tmp_ptr = '\0'; + } + + ret = kstrtol(buff, 10, &ldown); + if (ret) { + bat_err(net_dev, + "Download speed of gateway mode invalid: %s\n", + buff); + return false; + } + + *down = ldown * multi; + + /* we also got some upload info */ + if (slash_ptr) { + multi = 1; + + if (strlen(slash_ptr + 1) > 4) { + tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1); + + if (strnicmp(tmp_ptr, "mbit", 4) == 0) + multi = 1024; + + if ((strnicmp(tmp_ptr, "kbit", 4) == 0) || + (multi > 1)) + *tmp_ptr = '\0'; + } + + ret = kstrtol(slash_ptr + 1, 10, &lup); + if (ret) { + bat_err(net_dev, + "Upload speed of gateway mode invalid: %s\n", + slash_ptr + 1); + return false; + } + + *up = lup * multi; + } + + return true; +} + +ssize_t gw_bandwidth_set(struct net_device *net_dev, char *buff, size_t count) +{ + struct bat_priv *bat_priv = netdev_priv(net_dev); + long gw_bandwidth_tmp = 0; + int up = 0, down = 0; + bool ret; + + ret = parse_gw_bandwidth(net_dev, buff, &up, &down); + if (!ret) + goto end; + + if ((!down) || (down < 256)) + down = 2000; + + if (!up) + up = down / 5; + + kbit_to_gw_bandwidth(down, up, &gw_bandwidth_tmp); + + /** + * the gw bandwidth we guessed above might not match the given + * speeds, hence we need to calculate it back to show the number + * that is going to be propagated + **/ + gw_bandwidth_to_kbit((uint8_t)gw_bandwidth_tmp, &down, &up); + + gw_deselect(bat_priv); + bat_info(net_dev, + "Changing gateway bandwidth from: '%i' to: '%ld' (propagating: %d%s/%d%s)\n", + atomic_read(&bat_priv->gw_bandwidth), gw_bandwidth_tmp, + (down > 2048 ? down / 1024 : down), + (down > 2048 ? "MBit" : "KBit"), + (up > 2048 ? up / 1024 : up), + (up > 2048 ? "MBit" : "KBit")); + + atomic_set(&bat_priv->gw_bandwidth, gw_bandwidth_tmp); + +end: + return count; +} |