1 /*
2 * Copyright (C) 2009-2011 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 */
kbit_to_gw_bandwidth(int down,int up,long * gw_srv_class)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 */
gw_bandwidth_to_kbit(uint8_t gw_srv_class,int * down,int * up)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
parse_gw_bandwidth(struct net_device * net_dev,char * buff,long * up,long * down)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
gw_bandwidth_set(struct net_device * net_dev,char * buff,size_t count)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