1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner
5 */
6
7 #include "gateway_common.h"
8 #include "main.h"
9
10 #include <linux/atomic.h>
11 #include <linux/byteorder/generic.h>
12 #include <linux/stddef.h>
13 #include <linux/types.h>
14 #include <uapi/linux/batadv_packet.h>
15 #include <uapi/linux/batman_adv.h>
16
17 #include "gateway_client.h"
18 #include "tvlv.h"
19
20 /**
21 * batadv_gw_tvlv_container_update() - update the gw tvlv container after
22 * gateway setting change
23 * @bat_priv: the bat priv with all the soft interface information
24 */
25 void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
26 {
27 struct batadv_tvlv_gateway_data gw;
28 u32 down, up;
29 char gw_mode;
30
31 gw_mode = atomic_read(&bat_priv->gw.mode);
32
33 switch (gw_mode) {
34 case BATADV_GW_MODE_OFF:
35 case BATADV_GW_MODE_CLIENT:
36 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
37 break;
38 case BATADV_GW_MODE_SERVER:
39 down = atomic_read(&bat_priv->gw.bandwidth_down);
40 up = atomic_read(&bat_priv->gw.bandwidth_up);
41 gw.bandwidth_down = htonl(down);
42 gw.bandwidth_up = htonl(up);
43 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1,
44 &gw, sizeof(gw));
45 break;
46 }
47 }
48
49 /**
50 * batadv_gw_tvlv_ogm_handler_v1() - process incoming gateway tvlv container
51 * @bat_priv: the bat priv with all the soft interface information
52 * @orig: the orig_node of the ogm
53 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
54 * @tvlv_value: tvlv buffer containing the gateway data
55 * @tvlv_value_len: tvlv buffer length
56 */
57 static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
58 struct batadv_orig_node *orig,
59 u8 flags,
60 void *tvlv_value, u16 tvlv_value_len)
61 {
62 struct batadv_tvlv_gateway_data gateway, *gateway_ptr;
63
64 /* only fetch the tvlv value if the handler wasn't called via the
65 * CIFNOTFND flag and if there is data to fetch
66 */
67 if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND ||
68 tvlv_value_len < sizeof(gateway)) {
69 gateway.bandwidth_down = 0;
70 gateway.bandwidth_up = 0;
71 } else {
72 gateway_ptr = tvlv_value;
73 gateway.bandwidth_down = gateway_ptr->bandwidth_down;
74 gateway.bandwidth_up = gateway_ptr->bandwidth_up;
75 if (gateway.bandwidth_down == 0 ||
76 gateway.bandwidth_up == 0) {
77 gateway.bandwidth_down = 0;
78 gateway.bandwidth_up = 0;
79 }
80 }
81
82 batadv_gw_node_update(bat_priv, orig, &gateway);
83
84 /* restart gateway selection */
85 if (gateway.bandwidth_down != 0 &&
86 atomic_read(&bat_priv->gw.mode) == BATADV_GW_MODE_CLIENT)
87 batadv_gw_check_election(bat_priv, orig);
88 }
89
90 /**
91 * batadv_gw_init() - initialise the gateway handling internals
92 * @bat_priv: the bat priv with all the soft interface information
93 */
94 void batadv_gw_init(struct batadv_priv *bat_priv)
95 {
96 if (bat_priv->algo_ops->gw.init_sel_class)
97 bat_priv->algo_ops->gw.init_sel_class(bat_priv);
98 else
99 atomic_set(&bat_priv->gw.sel_class, 1);
100
101 batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
102 NULL, NULL, BATADV_TVLV_GW, 1,
103 BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
104 }
105
106 /**
107 * batadv_gw_free() - free the gateway handling internals
108 * @bat_priv: the bat priv with all the soft interface information
109 */
110 void batadv_gw_free(struct batadv_priv *bat_priv)
111 {
112 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
113 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1);
114 }
115
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