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authorSven Eckelmann <sven@narfation.org>2010-12-13 11:19:28 +0000
committerDavid S. Miller <davem@davemloft.net>2010-12-16 13:44:24 -0800
commitc6c8fea29769d998d94fcec9b9f14d4b52b349d3 (patch)
tree2c8dc8d1a64d48c5737a5745e3c510ff53a23047 /net/batman-adv/gateway_common.c
parentb236da6931e2482bfe44a7865dd4e7bb036f3496 (diff)
downloadlinux-stericsson-c6c8fea29769d998d94fcec9b9f14d4b52b349d3.tar.gz
net: Add batman-adv meshing protocol
B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is a routing protocol for multi-hop ad-hoc mesh networks. The networks may be wired or wireless. See http://www.open-mesh.org/ for more information and user space tools. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/batman-adv/gateway_common.c')
-rw-r--r--net/batman-adv/gateway_common.c177
1 files changed, 177 insertions, 0 deletions
diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c
new file mode 100644
index 000000000000..b962982f017e
--- /dev/null
+++ b/net/batman-adv/gateway_common.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2009-2010 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)
+{
+ char sbit = (gw_srv_class & 0x80) >> 7;
+ char dpart = (gw_srv_class & 0x78) >> 3;
+ char 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,
+ long *up, long *down)
+{
+ int ret, multi = 1;
+ char *slash_ptr, *tmp_ptr;
+
+ 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 = strict_strtoul(buff, 10, down);
+ if (ret) {
+ bat_err(net_dev,
+ "Download speed of gateway mode invalid: %s\n",
+ buff);
+ return false;
+ }
+
+ *down *= 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 = strict_strtoul(slash_ptr + 1, 10, up);
+ if (ret) {
+ bat_err(net_dev,
+ "Upload speed of gateway mode invalid: "
+ "%s\n", slash_ptr + 1);
+ return false;
+ }
+
+ *up *= 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, 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,
+ (int *)&down, (int *)&up);
+
+ gw_deselect(bat_priv);
+ bat_info(net_dev, "Changing gateway bandwidth from: '%i' to: '%ld' "
+ "(propagating: %ld%s/%ld%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;
+}