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) 2009-2020 B.A.T.M.A.N. contributors:
3 * 3 *
4 * Marek Lindner 4 * Marek Lindner
5 */ 5 */
6 6
7 #include "gateway_common.h" 7 #include "gateway_common.h"
8 #include "main.h" 8 #include "main.h"
9 9
10 #include <linux/atomic.h> 10 #include <linux/atomic.h>
11 #include <linux/byteorder/generic.h> 11 #include <linux/byteorder/generic.h>
>> 12 #include <linux/errno.h>
>> 13 #include <linux/kernel.h>
>> 14 #include <linux/limits.h>
>> 15 #include <linux/math64.h>
>> 16 #include <linux/netdevice.h>
12 #include <linux/stddef.h> 17 #include <linux/stddef.h>
13 #include <linux/types.h> !! 18 #include <linux/string.h>
14 #include <uapi/linux/batadv_packet.h> 19 #include <uapi/linux/batadv_packet.h>
15 #include <uapi/linux/batman_adv.h> 20 #include <uapi/linux/batman_adv.h>
16 21
17 #include "gateway_client.h" 22 #include "gateway_client.h"
>> 23 #include "log.h"
18 #include "tvlv.h" 24 #include "tvlv.h"
19 25
20 /** 26 /**
>> 27 * batadv_parse_throughput() - parse supplied string buffer to extract
>> 28 * throughput information
>> 29 * @net_dev: the soft interface net device
>> 30 * @buff: string buffer to parse
>> 31 * @description: text shown when throughput string cannot be parsed
>> 32 * @throughput: pointer holding the returned throughput information
>> 33 *
>> 34 * Return: false on parse error and true otherwise.
>> 35 */
>> 36 bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
>> 37 const char *description, u32 *throughput)
>> 38 {
>> 39 enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
>> 40 u64 lthroughput;
>> 41 char *tmp_ptr;
>> 42 int ret;
>> 43
>> 44 if (strlen(buff) > 4) {
>> 45 tmp_ptr = buff + strlen(buff) - 4;
>> 46
>> 47 if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
>> 48 bw_unit_type = BATADV_BW_UNIT_MBIT;
>> 49
>> 50 if (strncasecmp(tmp_ptr, "kbit", 4) == 0 ||
>> 51 bw_unit_type == BATADV_BW_UNIT_MBIT)
>> 52 *tmp_ptr = '\0';
>> 53 }
>> 54
>> 55 ret = kstrtou64(buff, 10, <hroughput);
>> 56 if (ret) {
>> 57 batadv_err(net_dev,
>> 58 "Invalid throughput speed for %s: %s\n",
>> 59 description, buff);
>> 60 return false;
>> 61 }
>> 62
>> 63 switch (bw_unit_type) {
>> 64 case BATADV_BW_UNIT_MBIT:
>> 65 /* prevent overflow */
>> 66 if (U64_MAX / 10 < lthroughput) {
>> 67 batadv_err(net_dev,
>> 68 "Throughput speed for %s too large: %s\n",
>> 69 description, buff);
>> 70 return false;
>> 71 }
>> 72
>> 73 lthroughput *= 10;
>> 74 break;
>> 75 case BATADV_BW_UNIT_KBIT:
>> 76 default:
>> 77 lthroughput = div_u64(lthroughput, 100);
>> 78 break;
>> 79 }
>> 80
>> 81 if (lthroughput > U32_MAX) {
>> 82 batadv_err(net_dev,
>> 83 "Throughput speed for %s too large: %s\n",
>> 84 description, buff);
>> 85 return false;
>> 86 }
>> 87
>> 88 *throughput = lthroughput;
>> 89
>> 90 return true;
>> 91 }
>> 92
>> 93 /**
>> 94 * batadv_parse_gw_bandwidth() - parse supplied string buffer to extract
>> 95 * download and upload bandwidth information
>> 96 * @net_dev: the soft interface net device
>> 97 * @buff: string buffer to parse
>> 98 * @down: pointer holding the returned download bandwidth information
>> 99 * @up: pointer holding the returned upload bandwidth information
>> 100 *
>> 101 * Return: false on parse error and true otherwise.
>> 102 */
>> 103 static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff,
>> 104 u32 *down, u32 *up)
>> 105 {
>> 106 char *slash_ptr;
>> 107 bool ret;
>> 108
>> 109 slash_ptr = strchr(buff, '/');
>> 110 if (slash_ptr)
>> 111 *slash_ptr = 0;
>> 112
>> 113 ret = batadv_parse_throughput(net_dev, buff, "download gateway speed",
>> 114 down);
>> 115 if (!ret)
>> 116 return false;
>> 117
>> 118 /* we also got some upload info */
>> 119 if (slash_ptr) {
>> 120 ret = batadv_parse_throughput(net_dev, slash_ptr + 1,
>> 121 "upload gateway speed", up);
>> 122 if (!ret)
>> 123 return false;
>> 124 }
>> 125
>> 126 return true;
>> 127 }
>> 128
>> 129 /**
21 * batadv_gw_tvlv_container_update() - update 130 * batadv_gw_tvlv_container_update() - update the gw tvlv container after
22 * gateway setting change 131 * gateway setting change
23 * @bat_priv: the bat priv with all the soft i 132 * @bat_priv: the bat priv with all the soft interface information
24 */ 133 */
25 void batadv_gw_tvlv_container_update(struct ba 134 void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
26 { 135 {
27 struct batadv_tvlv_gateway_data gw; 136 struct batadv_tvlv_gateway_data gw;
28 u32 down, up; 137 u32 down, up;
29 char gw_mode; 138 char gw_mode;
30 139
31 gw_mode = atomic_read(&bat_priv->gw.mo 140 gw_mode = atomic_read(&bat_priv->gw.mode);
32 141
33 switch (gw_mode) { 142 switch (gw_mode) {
34 case BATADV_GW_MODE_OFF: 143 case BATADV_GW_MODE_OFF:
35 case BATADV_GW_MODE_CLIENT: 144 case BATADV_GW_MODE_CLIENT:
36 batadv_tvlv_container_unregist 145 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
37 break; 146 break;
38 case BATADV_GW_MODE_SERVER: 147 case BATADV_GW_MODE_SERVER:
39 down = atomic_read(&bat_priv-> 148 down = atomic_read(&bat_priv->gw.bandwidth_down);
40 up = atomic_read(&bat_priv->gw 149 up = atomic_read(&bat_priv->gw.bandwidth_up);
41 gw.bandwidth_down = htonl(down 150 gw.bandwidth_down = htonl(down);
42 gw.bandwidth_up = htonl(up); 151 gw.bandwidth_up = htonl(up);
43 batadv_tvlv_container_register 152 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1,
44 153 &gw, sizeof(gw));
45 break; 154 break;
46 } 155 }
47 } 156 }
48 157
49 /** 158 /**
>> 159 * batadv_gw_bandwidth_set() - Parse and set download/upload gateway bandwidth
>> 160 * from supplied string buffer
>> 161 * @net_dev: netdev struct of the soft interface
>> 162 * @buff: the buffer containing the user data
>> 163 * @count: number of bytes in the buffer
>> 164 *
>> 165 * Return: 'count' on success or a negative error code in case of failure
>> 166 */
>> 167 ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff,
>> 168 size_t count)
>> 169 {
>> 170 struct batadv_priv *bat_priv = netdev_priv(net_dev);
>> 171 u32 down_curr;
>> 172 u32 up_curr;
>> 173 u32 down_new = 0;
>> 174 u32 up_new = 0;
>> 175 bool ret;
>> 176
>> 177 down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down);
>> 178 up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up);
>> 179
>> 180 ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new);
>> 181 if (!ret)
>> 182 return -EINVAL;
>> 183
>> 184 if (!down_new)
>> 185 down_new = 1;
>> 186
>> 187 if (!up_new)
>> 188 up_new = down_new / 5;
>> 189
>> 190 if (!up_new)
>> 191 up_new = 1;
>> 192
>> 193 if (down_curr == down_new && up_curr == up_new)
>> 194 return count;
>> 195
>> 196 batadv_gw_reselect(bat_priv);
>> 197 batadv_info(net_dev,
>> 198 "Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n",
>> 199 down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10,
>> 200 down_new / 10, down_new % 10, up_new / 10, up_new % 10);
>> 201
>> 202 atomic_set(&bat_priv->gw.bandwidth_down, down_new);
>> 203 atomic_set(&bat_priv->gw.bandwidth_up, up_new);
>> 204 batadv_gw_tvlv_container_update(bat_priv);
>> 205
>> 206 return count;
>> 207 }
>> 208
>> 209 /**
50 * batadv_gw_tvlv_ogm_handler_v1() - process i 210 * batadv_gw_tvlv_ogm_handler_v1() - process incoming gateway tvlv container
51 * @bat_priv: the bat priv with all the soft i 211 * @bat_priv: the bat priv with all the soft interface information
52 * @orig: the orig_node of the ogm 212 * @orig: the orig_node of the ogm
53 * @flags: flags indicating the tvlv state (se 213 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
54 * @tvlv_value: tvlv buffer containing the gat 214 * @tvlv_value: tvlv buffer containing the gateway data
55 * @tvlv_value_len: tvlv buffer length 215 * @tvlv_value_len: tvlv buffer length
56 */ 216 */
57 static void batadv_gw_tvlv_ogm_handler_v1(stru 217 static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
58 stru 218 struct batadv_orig_node *orig,
59 u8 f 219 u8 flags,
60 void 220 void *tvlv_value, u16 tvlv_value_len)
61 { 221 {
62 struct batadv_tvlv_gateway_data gatewa 222 struct batadv_tvlv_gateway_data gateway, *gateway_ptr;
63 223
64 /* only fetch the tvlv value if the ha 224 /* only fetch the tvlv value if the handler wasn't called via the
65 * CIFNOTFND flag and if there is data 225 * CIFNOTFND flag and if there is data to fetch
66 */ 226 */
67 if (flags & BATADV_TVLV_HANDLER_OGM_CI 227 if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND ||
68 tvlv_value_len < sizeof(gateway)) 228 tvlv_value_len < sizeof(gateway)) {
69 gateway.bandwidth_down = 0; 229 gateway.bandwidth_down = 0;
70 gateway.bandwidth_up = 0; 230 gateway.bandwidth_up = 0;
71 } else { 231 } else {
72 gateway_ptr = tvlv_value; 232 gateway_ptr = tvlv_value;
73 gateway.bandwidth_down = gatew 233 gateway.bandwidth_down = gateway_ptr->bandwidth_down;
74 gateway.bandwidth_up = gateway 234 gateway.bandwidth_up = gateway_ptr->bandwidth_up;
75 if (gateway.bandwidth_down == 235 if (gateway.bandwidth_down == 0 ||
76 gateway.bandwidth_up == 0) 236 gateway.bandwidth_up == 0) {
77 gateway.bandwidth_down 237 gateway.bandwidth_down = 0;
78 gateway.bandwidth_up = 238 gateway.bandwidth_up = 0;
79 } 239 }
80 } 240 }
81 241
82 batadv_gw_node_update(bat_priv, orig, 242 batadv_gw_node_update(bat_priv, orig, &gateway);
83 243
84 /* restart gateway selection */ 244 /* restart gateway selection */
85 if (gateway.bandwidth_down != 0 && 245 if (gateway.bandwidth_down != 0 &&
86 atomic_read(&bat_priv->gw.mode) == 246 atomic_read(&bat_priv->gw.mode) == BATADV_GW_MODE_CLIENT)
87 batadv_gw_check_election(bat_p 247 batadv_gw_check_election(bat_priv, orig);
88 } 248 }
89 249
90 /** 250 /**
91 * batadv_gw_init() - initialise the gateway h 251 * batadv_gw_init() - initialise the gateway handling internals
92 * @bat_priv: the bat priv with all the soft i 252 * @bat_priv: the bat priv with all the soft interface information
93 */ 253 */
94 void batadv_gw_init(struct batadv_priv *bat_pr 254 void batadv_gw_init(struct batadv_priv *bat_priv)
95 { 255 {
96 if (bat_priv->algo_ops->gw.init_sel_cl 256 if (bat_priv->algo_ops->gw.init_sel_class)
97 bat_priv->algo_ops->gw.init_se 257 bat_priv->algo_ops->gw.init_sel_class(bat_priv);
98 else 258 else
99 atomic_set(&bat_priv->gw.sel_c 259 atomic_set(&bat_priv->gw.sel_class, 1);
100 260
101 batadv_tvlv_handler_register(bat_priv, 261 batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
102 NULL, NUL !! 262 NULL, BATADV_TVLV_GW, 1,
103 BATADV_TV 263 BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
104 } 264 }
105 265
106 /** 266 /**
107 * batadv_gw_free() - free the gateway handlin 267 * batadv_gw_free() - free the gateway handling internals
108 * @bat_priv: the bat priv with all the soft i 268 * @bat_priv: the bat priv with all the soft interface information
109 */ 269 */
110 void batadv_gw_free(struct batadv_priv *bat_pr 270 void batadv_gw_free(struct batadv_priv *bat_priv)
111 { 271 {
112 batadv_tvlv_container_unregister(bat_p 272 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
113 batadv_tvlv_handler_unregister(bat_pri 273 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1);
114 } 274 }
115 275
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