| 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_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 (IS_ERR(hdr)) { |
| 105 | ret = PTR_ERR(hdr); |
| 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 | |
| 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 | |
| 168 | void irda_nl_unregister(void) |
| 169 | { |
| 170 | genl_unregister_family(&irda_nl_family); |
| 171 | } |