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Linux/net/irda/irnetlink.c

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  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 <linux/gfp.h>
 19 #include <net/net_namespace.h>
 20 #include <net/sock.h>
 21 #include <net/irda/irda.h>
 22 #include <net/irda/irlap.h>
 23 #include <net/genetlink.h>
 24 
 25 
 26 
 27 static struct genl_family irda_nl_family = {
 28         .id = GENL_ID_GENERATE,
 29         .name = IRDA_NL_NAME,
 30         .hdrsize = 0,
 31         .version = IRDA_NL_VERSION,
 32         .maxattr = IRDA_NL_CMD_MAX,
 33 };
 34 
 35 static struct net_device * ifname_to_netdev(struct net *net, struct genl_info *info)
 36 {
 37         char * ifname;
 38 
 39         if (!info->attrs[IRDA_NL_ATTR_IFNAME])
 40                 return NULL;
 41 
 42         ifname = nla_data(info->attrs[IRDA_NL_ATTR_IFNAME]);
 43 
 44         pr_debug("%s(): Looking for %s\n", __func__, ifname);
 45 
 46         return dev_get_by_name(net, ifname);
 47 }
 48 
 49 static int irda_nl_set_mode(struct sk_buff *skb, struct genl_info *info)
 50 {
 51         struct net_device * dev;
 52         struct irlap_cb * irlap;
 53         u32 mode;
 54 
 55         if (!info->attrs[IRDA_NL_ATTR_MODE])
 56                 return -EINVAL;
 57 
 58         mode = nla_get_u32(info->attrs[IRDA_NL_ATTR_MODE]);
 59 
 60         pr_debug("%s(): Switching to mode: %d\n", __func__, mode);
 61 
 62         dev = ifname_to_netdev(&init_net, info);
 63         if (!dev)
 64                 return -ENODEV;
 65 
 66         irlap = (struct irlap_cb *)dev->atalk_ptr;
 67         if (!irlap) {
 68                 dev_put(dev);
 69                 return -ENODEV;
 70         }
 71 
 72         irlap->mode = mode;
 73 
 74         dev_put(dev);
 75 
 76         return 0;
 77 }
 78 
 79 static int irda_nl_get_mode(struct sk_buff *skb, struct genl_info *info)
 80 {
 81         struct net_device * dev;
 82         struct irlap_cb * irlap;
 83         struct sk_buff *msg;
 84         void *hdr;
 85         int ret = -ENOBUFS;
 86 
 87         dev = ifname_to_netdev(&init_net, info);
 88         if (!dev)
 89                 return -ENODEV;
 90 
 91         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 92         if (!msg) {
 93                 dev_put(dev);
 94                 return -ENOMEM;
 95         }
 96 
 97         irlap = (struct irlap_cb *)dev->atalk_ptr;
 98         if (!irlap) {
 99                 ret = -ENODEV;
100                 goto err_out;
101         }
102 
103         hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
104                           &irda_nl_family, 0,  IRDA_NL_CMD_GET_MODE);
105         if (hdr == NULL) {
106                 ret = -EMSGSIZE;
107                 goto err_out;
108         }
109 
110         if(nla_put_string(msg, IRDA_NL_ATTR_IFNAME,
111                           dev->name))
112                 goto err_out;
113 
114         if(nla_put_u32(msg, IRDA_NL_ATTR_MODE, irlap->mode))
115                 goto err_out;
116 
117         genlmsg_end(msg, hdr);
118 
119         return genlmsg_reply(msg, info);
120 
121  err_out:
122         nlmsg_free(msg);
123         dev_put(dev);
124 
125         return ret;
126 }
127 
128 static const struct nla_policy irda_nl_policy[IRDA_NL_ATTR_MAX + 1] = {
129         [IRDA_NL_ATTR_IFNAME] = { .type = NLA_NUL_STRING,
130                                   .len = IFNAMSIZ-1 },
131         [IRDA_NL_ATTR_MODE] = { .type = NLA_U32 },
132 };
133 
134 static const struct genl_ops irda_nl_ops[] = {
135         {
136                 .cmd = IRDA_NL_CMD_SET_MODE,
137                 .doit = irda_nl_set_mode,
138                 .policy = irda_nl_policy,
139                 .flags = GENL_ADMIN_PERM,
140         },
141         {
142                 .cmd = IRDA_NL_CMD_GET_MODE,
143                 .doit = irda_nl_get_mode,
144                 .policy = irda_nl_policy,
145                 /* can be retrieved by unprivileged users */
146         },
147 
148 };
149 
150 int irda_nl_register(void)
151 {
152         return genl_register_family_with_ops(&irda_nl_family, irda_nl_ops);
153 }
154 
155 void irda_nl_unregister(void)
156 {
157         genl_unregister_family(&irda_nl_family);
158 }
159 

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