Commit | Line | Data |
---|---|---|
9f6446c7 | 1 | /* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
c6c8fea2 | 18 | #include "gateway_common.h" |
1e2c2a4f SE |
19 | #include "main.h" |
20 | ||
21 | #include <linux/atomic.h> | |
77927b7d | 22 | #include <linux/errno.h> |
1e2c2a4f SE |
23 | #include <linux/byteorder/generic.h> |
24 | #include <linux/kernel.h> | |
0b8336f5 | 25 | #include <linux/math64.h> |
1e2c2a4f SE |
26 | #include <linux/netdevice.h> |
27 | #include <linux/stddef.h> | |
28 | #include <linux/string.h> | |
29 | ||
c6c8fea2 | 30 | #include "gateway_client.h" |
1e2c2a4f | 31 | #include "packet.h" |
c6c8fea2 | 32 | |
414254e3 | 33 | /** |
d737ccbe SE |
34 | * batadv_parse_throughput - parse supplied string buffer to extract throughput |
35 | * information | |
414254e3 ML |
36 | * @net_dev: the soft interface net device |
37 | * @buff: string buffer to parse | |
d737ccbe SE |
38 | * @description: text shown when throughput string cannot be parsed |
39 | * @throughput: pointer holding the returned throughput information | |
414254e3 ML |
40 | * |
41 | * Returns false on parse error and true otherwise. | |
42 | */ | |
d737ccbe SE |
43 | static bool batadv_parse_throughput(struct net_device *net_dev, char *buff, |
44 | const char *description, u32 *throughput) | |
c6c8fea2 | 45 | { |
414254e3 | 46 | enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT; |
d737ccbe SE |
47 | u64 lthroughput; |
48 | char *tmp_ptr; | |
414254e3 | 49 | int ret; |
c6c8fea2 | 50 | |
c6c8fea2 SE |
51 | if (strlen(buff) > 4) { |
52 | tmp_ptr = buff + strlen(buff) - 4; | |
53 | ||
b7a8d756 | 54 | if (strncasecmp(tmp_ptr, "mbit", 4) == 0) |
414254e3 | 55 | bw_unit_type = BATADV_BW_UNIT_MBIT; |
c6c8fea2 | 56 | |
b7a8d756 | 57 | if ((strncasecmp(tmp_ptr, "kbit", 4) == 0) || |
414254e3 | 58 | (bw_unit_type == BATADV_BW_UNIT_MBIT)) |
c6c8fea2 SE |
59 | *tmp_ptr = '\0'; |
60 | } | |
61 | ||
d737ccbe | 62 | ret = kstrtou64(buff, 10, <hroughput); |
c6c8fea2 | 63 | if (ret) { |
3e34819e | 64 | batadv_err(net_dev, |
d737ccbe SE |
65 | "Invalid throughput speed for %s: %s\n", |
66 | description, buff); | |
c6c8fea2 SE |
67 | return false; |
68 | } | |
69 | ||
414254e3 ML |
70 | switch (bw_unit_type) { |
71 | case BATADV_BW_UNIT_MBIT: | |
0b8336f5 | 72 | /* prevent overflow */ |
d737ccbe | 73 | if (U64_MAX / 10 < lthroughput) { |
0b8336f5 | 74 | batadv_err(net_dev, |
d737ccbe SE |
75 | "Throughput speed for %s too large: %s\n", |
76 | description, buff); | |
0b8336f5 SE |
77 | return false; |
78 | } | |
79 | ||
d737ccbe | 80 | lthroughput *= 10; |
414254e3 ML |
81 | break; |
82 | case BATADV_BW_UNIT_KBIT: | |
83 | default: | |
d737ccbe | 84 | lthroughput = div_u64(lthroughput, 100); |
414254e3 ML |
85 | break; |
86 | } | |
c6c8fea2 | 87 | |
d737ccbe | 88 | if (lthroughput > U32_MAX) { |
0b8336f5 | 89 | batadv_err(net_dev, |
d737ccbe SE |
90 | "Throughput speed for %s too large: %s\n", |
91 | description, buff); | |
0b8336f5 SE |
92 | return false; |
93 | } | |
94 | ||
d737ccbe | 95 | *throughput = lthroughput; |
0b8336f5 | 96 | |
d737ccbe SE |
97 | return true; |
98 | } | |
c6c8fea2 | 99 | |
d737ccbe SE |
100 | /** |
101 | * batadv_parse_gw_bandwidth - parse supplied string buffer to extract download | |
102 | * and upload bandwidth information | |
103 | * @net_dev: the soft interface net device | |
104 | * @buff: string buffer to parse | |
105 | * @down: pointer holding the returned download bandwidth information | |
106 | * @up: pointer holding the returned upload bandwidth information | |
107 | * | |
108 | * Return: false on parse error and true otherwise. | |
109 | */ | |
110 | static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff, | |
111 | u32 *down, u32 *up) | |
112 | { | |
113 | char *slash_ptr; | |
114 | bool ret; | |
c6c8fea2 | 115 | |
d737ccbe SE |
116 | slash_ptr = strchr(buff, '/'); |
117 | if (slash_ptr) | |
118 | *slash_ptr = 0; | |
c6c8fea2 | 119 | |
d737ccbe SE |
120 | ret = batadv_parse_throughput(net_dev, buff, "download gateway speed", |
121 | down); | |
122 | if (!ret) | |
123 | return false; | |
0b8336f5 | 124 | |
d737ccbe SE |
125 | /* we also got some upload info */ |
126 | if (slash_ptr) { | |
127 | ret = batadv_parse_throughput(net_dev, slash_ptr + 1, | |
128 | "upload gateway speed", up); | |
129 | if (!ret) | |
0b8336f5 | 130 | return false; |
c6c8fea2 SE |
131 | } |
132 | ||
133 | return true; | |
134 | } | |
135 | ||
414254e3 ML |
136 | /** |
137 | * batadv_gw_tvlv_container_update - update the gw tvlv container after gateway | |
138 | * setting change | |
139 | * @bat_priv: the bat priv with all the soft interface information | |
140 | */ | |
141 | void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv) | |
142 | { | |
143 | struct batadv_tvlv_gateway_data gw; | |
6b5e971a | 144 | u32 down, up; |
414254e3 ML |
145 | char gw_mode; |
146 | ||
147 | gw_mode = atomic_read(&bat_priv->gw_mode); | |
148 | ||
149 | switch (gw_mode) { | |
150 | case BATADV_GW_MODE_OFF: | |
151 | case BATADV_GW_MODE_CLIENT: | |
152 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1); | |
153 | break; | |
154 | case BATADV_GW_MODE_SERVER: | |
155 | down = atomic_read(&bat_priv->gw.bandwidth_down); | |
156 | up = atomic_read(&bat_priv->gw.bandwidth_up); | |
157 | gw.bandwidth_down = htonl(down); | |
158 | gw.bandwidth_up = htonl(up); | |
159 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1, | |
160 | &gw, sizeof(gw)); | |
161 | break; | |
162 | } | |
163 | } | |
164 | ||
84d5e5e0 SE |
165 | ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff, |
166 | size_t count) | |
c6c8fea2 | 167 | { |
56303d34 | 168 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
4f248cff SE |
169 | u32 down_curr; |
170 | u32 up_curr; | |
171 | u32 down_new = 0; | |
172 | u32 up_new = 0; | |
c6c8fea2 SE |
173 | bool ret; |
174 | ||
414254e3 ML |
175 | down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down); |
176 | up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up); | |
177 | ||
178 | ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new); | |
c6c8fea2 | 179 | if (!ret) |
77927b7d | 180 | return -EINVAL; |
c6c8fea2 | 181 | |
414254e3 ML |
182 | if (!down_new) |
183 | down_new = 1; | |
c6c8fea2 | 184 | |
414254e3 ML |
185 | if (!up_new) |
186 | up_new = down_new / 5; | |
c6c8fea2 | 187 | |
414254e3 ML |
188 | if (!up_new) |
189 | up_new = 1; | |
c6c8fea2 | 190 | |
414254e3 | 191 | if ((down_curr == down_new) && (up_curr == up_new)) |
dafe94b2 ML |
192 | return count; |
193 | ||
4e820e72 | 194 | batadv_gw_reselect(bat_priv); |
3e34819e | 195 | batadv_info(net_dev, |
414254e3 ML |
196 | "Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n", |
197 | down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10, | |
198 | down_new / 10, down_new % 10, up_new / 10, up_new % 10); | |
c6c8fea2 | 199 | |
414254e3 ML |
200 | atomic_set(&bat_priv->gw.bandwidth_down, down_new); |
201 | atomic_set(&bat_priv->gw.bandwidth_up, up_new); | |
202 | batadv_gw_tvlv_container_update(bat_priv); | |
c6c8fea2 | 203 | |
c6c8fea2 SE |
204 | return count; |
205 | } | |
414254e3 ML |
206 | |
207 | /** | |
208 | * batadv_gw_tvlv_ogm_handler_v1 - process incoming gateway tvlv container | |
209 | * @bat_priv: the bat priv with all the soft interface information | |
210 | * @orig: the orig_node of the ogm | |
211 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
212 | * @tvlv_value: tvlv buffer containing the gateway data | |
213 | * @tvlv_value_len: tvlv buffer length | |
214 | */ | |
215 | static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
216 | struct batadv_orig_node *orig, | |
6b5e971a SE |
217 | u8 flags, |
218 | void *tvlv_value, u16 tvlv_value_len) | |
414254e3 ML |
219 | { |
220 | struct batadv_tvlv_gateway_data gateway, *gateway_ptr; | |
221 | ||
222 | /* only fetch the tvlv value if the handler wasn't called via the | |
223 | * CIFNOTFND flag and if there is data to fetch | |
224 | */ | |
225 | if ((flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) || | |
226 | (tvlv_value_len < sizeof(gateway))) { | |
227 | gateway.bandwidth_down = 0; | |
228 | gateway.bandwidth_up = 0; | |
229 | } else { | |
230 | gateway_ptr = tvlv_value; | |
231 | gateway.bandwidth_down = gateway_ptr->bandwidth_down; | |
232 | gateway.bandwidth_up = gateway_ptr->bandwidth_up; | |
233 | if ((gateway.bandwidth_down == 0) || | |
234 | (gateway.bandwidth_up == 0)) { | |
235 | gateway.bandwidth_down = 0; | |
236 | gateway.bandwidth_up = 0; | |
237 | } | |
238 | } | |
239 | ||
240 | batadv_gw_node_update(bat_priv, orig, &gateway); | |
241 | ||
242 | /* restart gateway selection if fast or late switching was enabled */ | |
243 | if ((gateway.bandwidth_down != 0) && | |
244 | (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && | |
245 | (atomic_read(&bat_priv->gw_sel_class) > 2)) | |
246 | batadv_gw_check_election(bat_priv, orig); | |
247 | } | |
248 | ||
249 | /** | |
250 | * batadv_gw_init - initialise the gateway handling internals | |
251 | * @bat_priv: the bat priv with all the soft interface information | |
252 | */ | |
253 | void batadv_gw_init(struct batadv_priv *bat_priv) | |
254 | { | |
255 | batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1, | |
256 | NULL, BATADV_TVLV_GW, 1, | |
257 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
258 | } | |
259 | ||
260 | /** | |
261 | * batadv_gw_free - free the gateway handling internals | |
262 | * @bat_priv: the bat priv with all the soft interface information | |
263 | */ | |
264 | void batadv_gw_free(struct batadv_priv *bat_priv) | |
265 | { | |
266 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1); | |
267 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1); | |
268 | } |