1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) B.A.T.M.A.N. contributors: !! 2 /* Copyright (C) 2009-2019 B.A.T.M.A.N. contributors:
3 * 3 *
4 * Marek Lindner 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, see <http://www.gnu.org/licenses/>.
5 */ 17 */
6 18
7 #include "gateway_common.h" 19 #include "gateway_common.h"
8 #include "main.h" 20 #include "main.h"
9 21
10 #include <linux/atomic.h> 22 #include <linux/atomic.h>
11 #include <linux/byteorder/generic.h> 23 #include <linux/byteorder/generic.h>
>> 24 #include <linux/errno.h>
>> 25 #include <linux/kernel.h>
>> 26 #include <linux/math64.h>
>> 27 #include <linux/netdevice.h>
12 #include <linux/stddef.h> 28 #include <linux/stddef.h>
13 #include <linux/types.h> !! 29 #include <linux/string.h>
14 #include <uapi/linux/batadv_packet.h> 30 #include <uapi/linux/batadv_packet.h>
15 #include <uapi/linux/batman_adv.h> 31 #include <uapi/linux/batman_adv.h>
16 32
17 #include "gateway_client.h" 33 #include "gateway_client.h"
>> 34 #include "log.h"
18 #include "tvlv.h" 35 #include "tvlv.h"
19 36
20 /** 37 /**
>> 38 * batadv_parse_throughput() - parse supplied string buffer to extract
>> 39 * throughput information
>> 40 * @net_dev: the soft interface net device
>> 41 * @buff: string buffer to parse
>> 42 * @description: text shown when throughput string cannot be parsed
>> 43 * @throughput: pointer holding the returned throughput information
>> 44 *
>> 45 * Return: false on parse error and true otherwise.
>> 46 */
>> 47 bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
>> 48 const char *description, u32 *throughput)
>> 49 {
>> 50 enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
>> 51 u64 lthroughput;
>> 52 char *tmp_ptr;
>> 53 int ret;
>> 54
>> 55 if (strlen(buff) > 4) {
>> 56 tmp_ptr = buff + strlen(buff) - 4;
>> 57
>> 58 if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
>> 59 bw_unit_type = BATADV_BW_UNIT_MBIT;
>> 60
>> 61 if (strncasecmp(tmp_ptr, "kbit", 4) == 0 ||
>> 62 bw_unit_type == BATADV_BW_UNIT_MBIT)
>> 63 *tmp_ptr = '\0';
>> 64 }
>> 65
>> 66 ret = kstrtou64(buff, 10, <hroughput);
>> 67 if (ret) {
>> 68 batadv_err(net_dev,
>> 69 "Invalid throughput speed for %s: %s\n",
>> 70 description, buff);
>> 71 return false;
>> 72 }
>> 73
>> 74 switch (bw_unit_type) {
>> 75 case BATADV_BW_UNIT_MBIT:
>> 76 /* prevent overflow */
>> 77 if (U64_MAX / 10 < lthroughput) {
>> 78 batadv_err(net_dev,
>> 79 "Throughput speed for %s too large: %s\n",
>> 80 description, buff);
>> 81 return false;
>> 82 }
>> 83
>> 84 lthroughput *= 10;
>> 85 break;
>> 86 case BATADV_BW_UNIT_KBIT:
>> 87 default:
>> 88 lthroughput = div_u64(lthroughput, 100);
>> 89 break;
>> 90 }
>> 91
>> 92 if (lthroughput > U32_MAX) {
>> 93 batadv_err(net_dev,
>> 94 "Throughput speed for %s too large: %s\n",
>> 95 description, buff);
>> 96 return false;
>> 97 }
>> 98
>> 99 *throughput = lthroughput;
>> 100
>> 101 return true;
>> 102 }
>> 103
>> 104 /**
>> 105 * batadv_parse_gw_bandwidth() - parse supplied string buffer to extract
>> 106 * download and upload bandwidth information
>> 107 * @net_dev: the soft interface net device
>> 108 * @buff: string buffer to parse
>> 109 * @down: pointer holding the returned download bandwidth information
>> 110 * @up: pointer holding the returned upload bandwidth information
>> 111 *
>> 112 * Return: false on parse error and true otherwise.
>> 113 */
>> 114 static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff,
>> 115 u32 *down, u32 *up)
>> 116 {
>> 117 char *slash_ptr;
>> 118 bool ret;
>> 119
>> 120 slash_ptr = strchr(buff, '/');
>> 121 if (slash_ptr)
>> 122 *slash_ptr = 0;
>> 123
>> 124 ret = batadv_parse_throughput(net_dev, buff, "download gateway speed",
>> 125 down);
>> 126 if (!ret)
>> 127 return false;
>> 128
>> 129 /* we also got some upload info */
>> 130 if (slash_ptr) {
>> 131 ret = batadv_parse_throughput(net_dev, slash_ptr + 1,
>> 132 "upload gateway speed", up);
>> 133 if (!ret)
>> 134 return false;
>> 135 }
>> 136
>> 137 return true;
>> 138 }
>> 139
>> 140 /**
21 * batadv_gw_tvlv_container_update() - update 141 * batadv_gw_tvlv_container_update() - update the gw tvlv container after
22 * gateway setting change 142 * gateway setting change
23 * @bat_priv: the bat priv with all the soft i 143 * @bat_priv: the bat priv with all the soft interface information
24 */ 144 */
25 void batadv_gw_tvlv_container_update(struct ba 145 void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
26 { 146 {
27 struct batadv_tvlv_gateway_data gw; 147 struct batadv_tvlv_gateway_data gw;
28 u32 down, up; 148 u32 down, up;
29 char gw_mode; 149 char gw_mode;
30 150
31 gw_mode = atomic_read(&bat_priv->gw.mo 151 gw_mode = atomic_read(&bat_priv->gw.mode);
32 152
33 switch (gw_mode) { 153 switch (gw_mode) {
34 case BATADV_GW_MODE_OFF: 154 case BATADV_GW_MODE_OFF:
35 case BATADV_GW_MODE_CLIENT: 155 case BATADV_GW_MODE_CLIENT:
36 batadv_tvlv_container_unregist 156 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
37 break; 157 break;
38 case BATADV_GW_MODE_SERVER: 158 case BATADV_GW_MODE_SERVER:
39 down = atomic_read(&bat_priv-> 159 down = atomic_read(&bat_priv->gw.bandwidth_down);
40 up = atomic_read(&bat_priv->gw 160 up = atomic_read(&bat_priv->gw.bandwidth_up);
41 gw.bandwidth_down = htonl(down 161 gw.bandwidth_down = htonl(down);
42 gw.bandwidth_up = htonl(up); 162 gw.bandwidth_up = htonl(up);
43 batadv_tvlv_container_register 163 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1,
44 164 &gw, sizeof(gw));
45 break; 165 break;
46 } 166 }
47 } 167 }
48 168
49 /** 169 /**
>> 170 * batadv_gw_bandwidth_set() - Parse and set download/upload gateway bandwidth
>> 171 * from supplied string buffer
>> 172 * @net_dev: netdev struct of the soft interface
>> 173 * @buff: the buffer containing the user data
>> 174 * @count: number of bytes in the buffer
>> 175 *
>> 176 * Return: 'count' on success or a negative error code in case of failure
>> 177 */
>> 178 ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff,
>> 179 size_t count)
>> 180 {
>> 181 struct batadv_priv *bat_priv = netdev_priv(net_dev);
>> 182 u32 down_curr;
>> 183 u32 up_curr;
>> 184 u32 down_new = 0;
>> 185 u32 up_new = 0;
>> 186 bool ret;
>> 187
>> 188 down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down);
>> 189 up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up);
>> 190
>> 191 ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new);
>> 192 if (!ret)
>> 193 return -EINVAL;
>> 194
>> 195 if (!down_new)
>> 196 down_new = 1;
>> 197
>> 198 if (!up_new)
>> 199 up_new = down_new / 5;
>> 200
>> 201 if (!up_new)
>> 202 up_new = 1;
>> 203
>> 204 if (down_curr == down_new && up_curr == up_new)
>> 205 return count;
>> 206
>> 207 batadv_gw_reselect(bat_priv);
>> 208 batadv_info(net_dev,
>> 209 "Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n",
>> 210 down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10,
>> 211 down_new / 10, down_new % 10, up_new / 10, up_new % 10);
>> 212
>> 213 atomic_set(&bat_priv->gw.bandwidth_down, down_new);
>> 214 atomic_set(&bat_priv->gw.bandwidth_up, up_new);
>> 215 batadv_gw_tvlv_container_update(bat_priv);
>> 216
>> 217 return count;
>> 218 }
>> 219
>> 220 /**
50 * batadv_gw_tvlv_ogm_handler_v1() - process i 221 * batadv_gw_tvlv_ogm_handler_v1() - process incoming gateway tvlv container
51 * @bat_priv: the bat priv with all the soft i 222 * @bat_priv: the bat priv with all the soft interface information
52 * @orig: the orig_node of the ogm 223 * @orig: the orig_node of the ogm
53 * @flags: flags indicating the tvlv state (se 224 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
54 * @tvlv_value: tvlv buffer containing the gat 225 * @tvlv_value: tvlv buffer containing the gateway data
55 * @tvlv_value_len: tvlv buffer length 226 * @tvlv_value_len: tvlv buffer length
56 */ 227 */
57 static void batadv_gw_tvlv_ogm_handler_v1(stru 228 static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
58 stru 229 struct batadv_orig_node *orig,
59 u8 f 230 u8 flags,
60 void 231 void *tvlv_value, u16 tvlv_value_len)
61 { 232 {
62 struct batadv_tvlv_gateway_data gatewa 233 struct batadv_tvlv_gateway_data gateway, *gateway_ptr;
63 234
64 /* only fetch the tvlv value if the ha 235 /* only fetch the tvlv value if the handler wasn't called via the
65 * CIFNOTFND flag and if there is data 236 * CIFNOTFND flag and if there is data to fetch
66 */ 237 */
67 if (flags & BATADV_TVLV_HANDLER_OGM_CI 238 if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND ||
68 tvlv_value_len < sizeof(gateway)) 239 tvlv_value_len < sizeof(gateway)) {
69 gateway.bandwidth_down = 0; 240 gateway.bandwidth_down = 0;
70 gateway.bandwidth_up = 0; 241 gateway.bandwidth_up = 0;
71 } else { 242 } else {
72 gateway_ptr = tvlv_value; 243 gateway_ptr = tvlv_value;
73 gateway.bandwidth_down = gatew 244 gateway.bandwidth_down = gateway_ptr->bandwidth_down;
74 gateway.bandwidth_up = gateway 245 gateway.bandwidth_up = gateway_ptr->bandwidth_up;
75 if (gateway.bandwidth_down == 246 if (gateway.bandwidth_down == 0 ||
76 gateway.bandwidth_up == 0) 247 gateway.bandwidth_up == 0) {
77 gateway.bandwidth_down 248 gateway.bandwidth_down = 0;
78 gateway.bandwidth_up = 249 gateway.bandwidth_up = 0;
79 } 250 }
80 } 251 }
81 252
82 batadv_gw_node_update(bat_priv, orig, 253 batadv_gw_node_update(bat_priv, orig, &gateway);
83 254
84 /* restart gateway selection */ 255 /* restart gateway selection */
85 if (gateway.bandwidth_down != 0 && 256 if (gateway.bandwidth_down != 0 &&
86 atomic_read(&bat_priv->gw.mode) == 257 atomic_read(&bat_priv->gw.mode) == BATADV_GW_MODE_CLIENT)
87 batadv_gw_check_election(bat_p 258 batadv_gw_check_election(bat_priv, orig);
88 } 259 }
89 260
90 /** 261 /**
91 * batadv_gw_init() - initialise the gateway h 262 * batadv_gw_init() - initialise the gateway handling internals
92 * @bat_priv: the bat priv with all the soft i 263 * @bat_priv: the bat priv with all the soft interface information
93 */ 264 */
94 void batadv_gw_init(struct batadv_priv *bat_pr 265 void batadv_gw_init(struct batadv_priv *bat_priv)
95 { 266 {
96 if (bat_priv->algo_ops->gw.init_sel_cl 267 if (bat_priv->algo_ops->gw.init_sel_class)
97 bat_priv->algo_ops->gw.init_se 268 bat_priv->algo_ops->gw.init_sel_class(bat_priv);
98 else 269 else
99 atomic_set(&bat_priv->gw.sel_c 270 atomic_set(&bat_priv->gw.sel_class, 1);
100 271
101 batadv_tvlv_handler_register(bat_priv, 272 batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
102 NULL, NUL !! 273 NULL, BATADV_TVLV_GW, 1,
103 BATADV_TV 274 BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
104 } 275 }
105 276
106 /** 277 /**
107 * batadv_gw_free() - free the gateway handlin 278 * batadv_gw_free() - free the gateway handling internals
108 * @bat_priv: the bat priv with all the soft i 279 * @bat_priv: the bat priv with all the soft interface information
109 */ 280 */
110 void batadv_gw_free(struct batadv_priv *bat_pr 281 void batadv_gw_free(struct batadv_priv *bat_priv)
111 { 282 {
112 batadv_tvlv_container_unregister(bat_p 283 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
113 batadv_tvlv_handler_unregister(bat_pri 284 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1);
114 } 285 }
115 286
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