1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Netlink interface for IEEE 802.15.4 stack
4  *
5  * Copyright 2007, 2008 Siemens AG
6  *
7  * Written by:
8  * Sergey Lapin <slapin@ossfans.org>
9  * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
10  * Maxim Osipov <maxim.osipov@siemens.com>
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/gfp.h>
15 #include <net/genetlink.h>
16 #include <linux/nl802154.h>
17 
18 #include "ieee802154.h"
19 
20 static unsigned int ieee802154_seq_num;
21 static DEFINE_SPINLOCK(ieee802154_seq_lock);
22 
23 /* Requests to userspace */
ieee802154_nl_create(int flags,u8 req)24 struct sk_buff *ieee802154_nl_create(int flags, u8 req)
25 {
26 	void *hdr;
27 	struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
28 	unsigned long f;
29 
30 	if (!msg)
31 		return NULL;
32 
33 	spin_lock_irqsave(&ieee802154_seq_lock, f);
34 	hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
35 			  &nl802154_family, flags, req);
36 	spin_unlock_irqrestore(&ieee802154_seq_lock, f);
37 	if (!hdr) {
38 		nlmsg_free(msg);
39 		return NULL;
40 	}
41 
42 	return msg;
43 }
44 
ieee802154_nl_mcast(struct sk_buff * msg,unsigned int group)45 int ieee802154_nl_mcast(struct sk_buff *msg, unsigned int group)
46 {
47 	struct nlmsghdr *nlh = nlmsg_hdr(msg);
48 	void *hdr = genlmsg_data(nlmsg_data(nlh));
49 
50 	genlmsg_end(msg, hdr);
51 
52 	return genlmsg_multicast(&nl802154_family, msg, 0, group, GFP_ATOMIC);
53 }
54 
ieee802154_nl_new_reply(struct genl_info * info,int flags,u8 req)55 struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info,
56 					int flags, u8 req)
57 {
58 	void *hdr;
59 	struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
60 
61 	if (!msg)
62 		return NULL;
63 
64 	hdr = genlmsg_put_reply(msg, info,
65 				&nl802154_family, flags, req);
66 	if (!hdr) {
67 		nlmsg_free(msg);
68 		return NULL;
69 	}
70 
71 	return msg;
72 }
73 
ieee802154_nl_reply(struct sk_buff * msg,struct genl_info * info)74 int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info)
75 {
76 	struct nlmsghdr *nlh = nlmsg_hdr(msg);
77 	void *hdr = genlmsg_data(nlmsg_data(nlh));
78 
79 	genlmsg_end(msg, hdr);
80 
81 	return genlmsg_reply(msg, info);
82 }
83 
84 static const struct genl_small_ops ieee802154_ops[] = {
85 	/* see nl-phy.c */
86 	IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
87 			ieee802154_dump_phy),
88 	IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
89 	IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
90 	/* see nl-mac.c */
91 	IEEE802154_OP(IEEE802154_ASSOCIATE_REQ, ieee802154_associate_req),
92 	IEEE802154_OP(IEEE802154_ASSOCIATE_RESP, ieee802154_associate_resp),
93 	IEEE802154_OP(IEEE802154_DISASSOCIATE_REQ, ieee802154_disassociate_req),
94 	IEEE802154_OP(IEEE802154_SCAN_REQ, ieee802154_scan_req),
95 	IEEE802154_OP(IEEE802154_START_REQ, ieee802154_start_req),
96 	IEEE802154_DUMP(IEEE802154_LIST_IFACE, ieee802154_list_iface,
97 			ieee802154_dump_iface),
98 	IEEE802154_OP(IEEE802154_SET_MACPARAMS, ieee802154_set_macparams),
99 	IEEE802154_OP(IEEE802154_LLSEC_GETPARAMS, ieee802154_llsec_getparams),
100 	IEEE802154_OP(IEEE802154_LLSEC_SETPARAMS, ieee802154_llsec_setparams),
101 	IEEE802154_DUMP(IEEE802154_LLSEC_LIST_KEY, NULL,
102 			ieee802154_llsec_dump_keys),
103 	IEEE802154_OP(IEEE802154_LLSEC_ADD_KEY, ieee802154_llsec_add_key),
104 	IEEE802154_OP(IEEE802154_LLSEC_DEL_KEY, ieee802154_llsec_del_key),
105 	IEEE802154_DUMP(IEEE802154_LLSEC_LIST_DEV, NULL,
106 			ieee802154_llsec_dump_devs),
107 	IEEE802154_OP(IEEE802154_LLSEC_ADD_DEV, ieee802154_llsec_add_dev),
108 	IEEE802154_OP(IEEE802154_LLSEC_DEL_DEV, ieee802154_llsec_del_dev),
109 	IEEE802154_DUMP(IEEE802154_LLSEC_LIST_DEVKEY, NULL,
110 			ieee802154_llsec_dump_devkeys),
111 	IEEE802154_OP(IEEE802154_LLSEC_ADD_DEVKEY, ieee802154_llsec_add_devkey),
112 	IEEE802154_OP(IEEE802154_LLSEC_DEL_DEVKEY, ieee802154_llsec_del_devkey),
113 	IEEE802154_DUMP(IEEE802154_LLSEC_LIST_SECLEVEL, NULL,
114 			ieee802154_llsec_dump_seclevels),
115 	IEEE802154_OP(IEEE802154_LLSEC_ADD_SECLEVEL,
116 		      ieee802154_llsec_add_seclevel),
117 	IEEE802154_OP(IEEE802154_LLSEC_DEL_SECLEVEL,
118 		      ieee802154_llsec_del_seclevel),
119 };
120 
121 static const struct genl_multicast_group ieee802154_mcgrps[] = {
122 	[IEEE802154_COORD_MCGRP] = { .name = IEEE802154_MCAST_COORD_NAME, },
123 	[IEEE802154_BEACON_MCGRP] = { .name = IEEE802154_MCAST_BEACON_NAME, },
124 };
125 
126 struct genl_family nl802154_family __ro_after_init = {
127 	.hdrsize	= 0,
128 	.name		= IEEE802154_NL_NAME,
129 	.version	= 1,
130 	.maxattr	= IEEE802154_ATTR_MAX,
131 	.policy		= ieee802154_policy,
132 	.module		= THIS_MODULE,
133 	.small_ops	= ieee802154_ops,
134 	.n_small_ops	= ARRAY_SIZE(ieee802154_ops),
135 	.mcgrps		= ieee802154_mcgrps,
136 	.n_mcgrps	= ARRAY_SIZE(ieee802154_mcgrps),
137 };
138 
ieee802154_nl_init(void)139 int __init ieee802154_nl_init(void)
140 {
141 	return genl_register_family(&nl802154_family);
142 }
143 
ieee802154_nl_exit(void)144 void ieee802154_nl_exit(void)
145 {
146 	genl_unregister_family(&nl802154_family);
147 }
148