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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 <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 
 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 
 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 
 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_DEFAULT_SIZE, 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_reply(msg, info);
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 
149 int irda_nl_register(void)
150 {
151         return genl_register_family_with_ops(&irda_nl_family,
152                 irda_nl_ops, ARRAY_SIZE(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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