net/irda/irnetlink.c

   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 const 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 }