1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Authors:
* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
*/
#include <linux/module.h>
#include <net/6lowpan.h>
#include <net/addrconf.h>
#include "6lowpan_i.h"
int lowpan_register_netdevice(struct net_device *dev,
enum lowpan_lltypes lltype)
{
int i, ret;
switch (lltype) {
case LOWPAN_LLTYPE_IEEE802154:
dev->addr_len = EUI64_ADDR_LEN;
break;
case LOWPAN_LLTYPE_BTLE:
dev->addr_len = ETH_ALEN;
break;
}
dev->type = ARPHRD_6LOWPAN;
dev->mtu = IPV6_MIN_MTU;
lowpan_dev(dev)->lltype = lltype;
spin_lock_init(&lowpan_dev(dev)->ctx.lock);
for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
lowpan_dev(dev)->ctx.table[i].id = i;
dev->ndisc_ops = &lowpan_ndisc_ops;
ret = register_netdevice(dev);
if (ret < 0)
return ret;
lowpan_dev_debugfs_init(dev);
return ret;
}
EXPORT_SYMBOL(lowpan_register_netdevice);
int lowpan_register_netdev(struct net_device *dev,
enum lowpan_lltypes lltype)
{
int ret;
rtnl_lock();
ret = lowpan_register_netdevice(dev, lltype);
rtnl_unlock();
return ret;
}
EXPORT_SYMBOL(lowpan_register_netdev);
void lowpan_unregister_netdevice(struct net_device *dev)
{
unregister_netdevice(dev);
lowpan_dev_debugfs_exit(dev);
}
EXPORT_SYMBOL(lowpan_unregister_netdevice);
void lowpan_unregister_netdev(struct net_device *dev)
{
rtnl_lock();
lowpan_unregister_netdevice(dev);
rtnl_unlock();
}
EXPORT_SYMBOL(lowpan_unregister_netdev);
int addrconf_ifid_802154_6lowpan(u8 *eui, struct net_device *dev)
{
struct wpan_dev *wpan_dev = lowpan_802154_dev(dev)->wdev->ieee802154_ptr;
/* Set short_addr autoconfiguration if short_addr is present only */
if (!lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr))
return -1;
/* For either address format, all zero addresses MUST NOT be used */
if (wpan_dev->pan_id == cpu_to_le16(0x0000) &&
wpan_dev->short_addr == cpu_to_le16(0x0000))
return -1;
/* Alternatively, if no PAN ID is known, 16 zero bits may be used */
if (wpan_dev->pan_id == cpu_to_le16(IEEE802154_PAN_ID_BROADCAST))
memset(eui, 0, 2);
else
ieee802154_le16_to_be16(eui, &wpan_dev->pan_id);
/* The "Universal/Local" (U/L) bit shall be set to zero */
eui[0] &= ~2;
eui[2] = 0;
eui[3] = 0xFF;
eui[4] = 0xFE;
eui[5] = 0;
ieee802154_le16_to_be16(&eui[6], &wpan_dev->short_addr);
return 0;
}
static int lowpan_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct inet6_dev *idev;
struct in6_addr addr;
int i;
if (dev->type != ARPHRD_6LOWPAN)
return NOTIFY_DONE;
idev = __in6_dev_get(dev);
if (!idev)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UP:
case NETDEV_CHANGE:
/* (802.15.4 6LoWPAN short address slaac handling */
if (lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154) &&
addrconf_ifid_802154_6lowpan(addr.s6_addr + 8, dev) == 0) {
__ipv6_addr_set_half(&addr.s6_addr32[0],
htonl(0xFE800000), 0);
addrconf_add_linklocal(idev, &addr, 0);
}
break;
case NETDEV_DOWN:
for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE,
&lowpan_dev(dev)->ctx.table[i].flags);
break;
default:
return NOTIFY_DONE;
}
return NOTIFY_OK;
}
static struct notifier_block lowpan_notifier = {
.notifier_call = lowpan_event,
};
static int __init lowpan_module_init(void)
{
int ret;
lowpan_debugfs_init();
ret = register_netdevice_notifier(&lowpan_notifier);
if (ret < 0) {
lowpan_debugfs_exit();
return ret;
}
request_module_nowait("nhc_dest");
request_module_nowait("nhc_fragment");
request_module_nowait("nhc_hop");
request_module_nowait("nhc_ipv6");
request_module_nowait("nhc_mobility");
request_module_nowait("nhc_routing");
request_module_nowait("nhc_udp");
return 0;
}
static void __exit lowpan_module_exit(void)
{
lowpan_debugfs_exit();
unregister_netdevice_notifier(&lowpan_notifier);
}
module_init(lowpan_module_init);
module_exit(lowpan_module_exit);
MODULE_LICENSE("GPL");
|
