1 /*
2 * IrDA netlink layer, for stack configuration.
3 *
4 * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
5 *
6 * Partly based on the 802.11 nelink implementation
7 * (see net/wireless/nl80211.c) which is:
8 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 */
15
16 #include <linux/socket.h>
17 #include <linux/irda.h>
18 #include <net/net_namespace.h>
19 #include <net/sock.h>
20 #include <net/irda/irda.h>
21 #include <net/irda/irlap.h>
22 #include <net/genetlink.h>
23
24
25
26 static struct genl_family irda_nl_family = {
27 .id = GENL_ID_GENERATE,
28 .name = IRDA_NL_NAME,
29 .hdrsize = 0,
30 .version = IRDA_NL_VERSION,
31 .maxattr = IRDA_NL_CMD_MAX,
32 };
33
ifname_to_netdev(struct net * net,struct genl_info * info)34 static struct net_device * ifname_to_netdev(struct net *net, struct genl_info *info)
35 {
36 char * ifname;
37
38 if (!info->attrs[IRDA_NL_ATTR_IFNAME])
39 return NULL;
40
41 ifname = nla_data(info->attrs[IRDA_NL_ATTR_IFNAME]);
42
43 IRDA_DEBUG(5, "%s(): Looking for %s\n", __func__, ifname);
44
45 return dev_get_by_name(net, ifname);
46 }
47
irda_nl_set_mode(struct sk_buff * skb,struct genl_info * info)48 static int irda_nl_set_mode(struct sk_buff *skb, struct genl_info *info)
49 {
50 struct net_device * dev;
51 struct irlap_cb * irlap;
52 u32 mode;
53
54 if (!info->attrs[IRDA_NL_ATTR_MODE])
55 return -EINVAL;
56
57 mode = nla_get_u32(info->attrs[IRDA_NL_ATTR_MODE]);
58
59 IRDA_DEBUG(5, "%s(): Switching to mode: %d\n", __func__, mode);
60
61 dev = ifname_to_netdev(&init_net, info);
62 if (!dev)
63 return -ENODEV;
64
65 irlap = (struct irlap_cb *)dev->atalk_ptr;
66 if (!irlap) {
67 dev_put(dev);
68 return -ENODEV;
69 }
70
71 irlap->mode = mode;
72
73 dev_put(dev);
74
75 return 0;
76 }
77
irda_nl_get_mode(struct sk_buff * skb,struct genl_info * info)78 static int irda_nl_get_mode(struct sk_buff *skb, struct genl_info *info)
79 {
80 struct net_device * dev;
81 struct irlap_cb * irlap;
82 struct sk_buff *msg;
83 void *hdr;
84 int ret = -ENOBUFS;
85
86 dev = ifname_to_netdev(&init_net, info);
87 if (!dev)
88 return -ENODEV;
89
90 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
91 if (!msg) {
92 dev_put(dev);
93 return -ENOMEM;
94 }
95
96 irlap = (struct irlap_cb *)dev->atalk_ptr;
97 if (!irlap) {
98 ret = -ENODEV;
99 goto err_out;
100 }
101
102 hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
103 &irda_nl_family, 0, IRDA_NL_CMD_GET_MODE);
104 if (hdr == NULL) {
105 ret = -EMSGSIZE;
106 goto err_out;
107 }
108
109 if(nla_put_string(msg, IRDA_NL_ATTR_IFNAME,
110 dev->name))
111 goto err_out;
112
113 if(nla_put_u32(msg, IRDA_NL_ATTR_MODE, irlap->mode))
114 goto err_out;
115
116 genlmsg_end(msg, hdr);
117
118 return genlmsg_unicast(msg, info->snd_pid);
119
120 err_out:
121 nlmsg_free(msg);
122 dev_put(dev);
123
124 return ret;
125 }
126
127 static struct nla_policy irda_nl_policy[IRDA_NL_ATTR_MAX + 1] = {
128 [IRDA_NL_ATTR_IFNAME] = { .type = NLA_NUL_STRING,
129 .len = IFNAMSIZ-1 },
130 [IRDA_NL_ATTR_MODE] = { .type = NLA_U32 },
131 };
132
133 static struct genl_ops irda_nl_ops[] = {
134 {
135 .cmd = IRDA_NL_CMD_SET_MODE,
136 .doit = irda_nl_set_mode,
137 .policy = irda_nl_policy,
138 .flags = GENL_ADMIN_PERM,
139 },
140 {
141 .cmd = IRDA_NL_CMD_GET_MODE,
142 .doit = irda_nl_get_mode,
143 .policy = irda_nl_policy,
144 /* can be retrieved by unprivileged users */
145 },
146
147 };
148
irda_nl_register(void)149 int irda_nl_register(void)
150 {
151 int err, i;
152
153 err = genl_register_family(&irda_nl_family);
154 if (err)
155 return err;
156
157 for (i = 0; i < ARRAY_SIZE(irda_nl_ops); i++) {
158 err = genl_register_ops(&irda_nl_family, &irda_nl_ops[i]);
159 if (err)
160 goto err_out;
161 }
162 return 0;
163 err_out:
164 genl_unregister_family(&irda_nl_family);
165 return err;
166 }
167
irda_nl_unregister(void)168 void irda_nl_unregister(void)
169 {
170 genl_unregister_family(&irda_nl_family);
171 }
172