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