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 <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         IRDA_DEBUG(5, "%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         IRDA_DEBUG(5, "%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_pid, 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 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,
 153                 irda_nl_ops, ARRAY_SIZE(irda_nl_ops));
 154 }
 155
 156 void irda_nl_unregister(void)
 157 {
 158         genl_unregister_family(&irda_nl_family);
 159 }