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b9cabe52c2
In net/ieee802154/nl-phy.c::ieee802154_nl_fill_phy() I see two small issues. 1) If the allocation of 'buf' fails we may just as well return -EMSGSIZE directly rather than jumping to 'out:' and do a pointless kfree(0). 2) We do not free 'buf' unless we jump to one of the error labels and this leaks memory. This patch should address both. Signed-off-by: Jesper Juhl <jj@chaosbits.net> Acked-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Signed-off-by: David S. Miller <davem@conan.davemloft.net>
347 lines
7.4 KiB
C
347 lines
7.4 KiB
C
/*
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* Netlink inteface for IEEE 802.15.4 stack
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*
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* Copyright 2007, 2008 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Written by:
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* Sergey Lapin <slapin@ossfans.org>
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Maxim Osipov <maxim.osipov@siemens.com>
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <net/wpan-phy.h>
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#include <net/af_ieee802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/rtnetlink.h> /* for rtnl_{un,}lock */
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#include <linux/nl802154.h>
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#include "ieee802154.h"
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static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
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u32 seq, int flags, struct wpan_phy *phy)
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{
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void *hdr;
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int i, pages = 0;
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uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);
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pr_debug("%s\n", __func__);
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if (!buf)
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return -EMSGSIZE;
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hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
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IEEE802154_LIST_PHY);
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if (!hdr)
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goto out;
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mutex_lock(&phy->pib_lock);
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NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
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NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page);
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NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel);
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for (i = 0; i < 32; i++) {
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if (phy->channels_supported[i])
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buf[pages++] = phy->channels_supported[i] | (i << 27);
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}
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if (pages)
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NLA_PUT(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
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pages * sizeof(uint32_t), buf);
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mutex_unlock(&phy->pib_lock);
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kfree(buf);
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return genlmsg_end(msg, hdr);
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nla_put_failure:
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mutex_unlock(&phy->pib_lock);
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genlmsg_cancel(msg, hdr);
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out:
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kfree(buf);
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return -EMSGSIZE;
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}
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static int ieee802154_list_phy(struct sk_buff *skb,
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struct genl_info *info)
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{
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/* Request for interface name, index, type, IEEE address,
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PAN Id, short address */
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struct sk_buff *msg;
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struct wpan_phy *phy;
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const char *name;
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int rc = -ENOBUFS;
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pr_debug("%s\n", __func__);
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if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
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return -EINVAL;
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name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
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if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
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return -EINVAL; /* phy name should be null-terminated */
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phy = wpan_phy_find(name);
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if (!phy)
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return -ENODEV;
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msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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if (!msg)
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goto out_dev;
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rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq,
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0, phy);
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if (rc < 0)
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goto out_free;
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wpan_phy_put(phy);
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return genlmsg_reply(msg, info);
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out_free:
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nlmsg_free(msg);
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out_dev:
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wpan_phy_put(phy);
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return rc;
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}
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struct dump_phy_data {
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struct sk_buff *skb;
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struct netlink_callback *cb;
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int idx, s_idx;
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};
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static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
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{
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int rc;
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struct dump_phy_data *data = _data;
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pr_debug("%s\n", __func__);
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if (data->idx++ < data->s_idx)
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return 0;
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rc = ieee802154_nl_fill_phy(data->skb,
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NETLINK_CB(data->cb->skb).pid,
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data->cb->nlh->nlmsg_seq,
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NLM_F_MULTI,
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phy);
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if (rc < 0) {
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data->idx--;
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return rc;
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}
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return 0;
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}
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static int ieee802154_dump_phy(struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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struct dump_phy_data data = {
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.cb = cb,
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.skb = skb,
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.s_idx = cb->args[0],
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.idx = 0,
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};
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pr_debug("%s\n", __func__);
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wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
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cb->args[0] = data.idx;
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return skb->len;
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}
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static int ieee802154_add_iface(struct sk_buff *skb,
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struct genl_info *info)
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{
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struct sk_buff *msg;
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struct wpan_phy *phy;
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const char *name;
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const char *devname;
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int rc = -ENOBUFS;
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struct net_device *dev;
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pr_debug("%s\n", __func__);
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if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
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return -EINVAL;
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name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
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if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
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return -EINVAL; /* phy name should be null-terminated */
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if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
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devname = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
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if (devname[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1]
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!= '\0')
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return -EINVAL; /* phy name should be null-terminated */
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} else {
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devname = "wpan%d";
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}
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if (strlen(devname) >= IFNAMSIZ)
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return -ENAMETOOLONG;
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phy = wpan_phy_find(name);
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if (!phy)
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return -ENODEV;
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msg = ieee802154_nl_new_reply(info, 0, IEEE802154_ADD_IFACE);
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if (!msg)
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goto out_dev;
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if (!phy->add_iface) {
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rc = -EINVAL;
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goto nla_put_failure;
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}
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dev = phy->add_iface(phy, devname);
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if (IS_ERR(dev)) {
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rc = PTR_ERR(dev);
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goto nla_put_failure;
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}
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NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
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NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
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dev_put(dev);
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wpan_phy_put(phy);
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return ieee802154_nl_reply(msg, info);
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nla_put_failure:
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nlmsg_free(msg);
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out_dev:
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wpan_phy_put(phy);
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return rc;
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}
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static int ieee802154_del_iface(struct sk_buff *skb,
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struct genl_info *info)
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{
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struct sk_buff *msg;
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struct wpan_phy *phy;
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const char *name;
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int rc;
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struct net_device *dev;
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pr_debug("%s\n", __func__);
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if (!info->attrs[IEEE802154_ATTR_DEV_NAME])
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return -EINVAL;
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name = nla_data(info->attrs[IEEE802154_ATTR_DEV_NAME]);
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if (name[nla_len(info->attrs[IEEE802154_ATTR_DEV_NAME]) - 1] != '\0')
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return -EINVAL; /* name should be null-terminated */
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dev = dev_get_by_name(genl_info_net(info), name);
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if (!dev)
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return -ENODEV;
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phy = ieee802154_mlme_ops(dev)->get_phy(dev);
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BUG_ON(!phy);
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rc = -EINVAL;
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/* phy name is optional, but should be checked if it's given */
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if (info->attrs[IEEE802154_ATTR_PHY_NAME]) {
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struct wpan_phy *phy2;
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const char *pname =
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nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
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if (pname[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1]
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!= '\0')
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/* name should be null-terminated */
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goto out_dev;
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phy2 = wpan_phy_find(pname);
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if (!phy2)
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goto out_dev;
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if (phy != phy2) {
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wpan_phy_put(phy2);
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goto out_dev;
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}
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}
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rc = -ENOBUFS;
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msg = ieee802154_nl_new_reply(info, 0, IEEE802154_DEL_IFACE);
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if (!msg)
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goto out_dev;
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if (!phy->del_iface) {
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rc = -EINVAL;
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goto nla_put_failure;
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}
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rtnl_lock();
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phy->del_iface(phy, dev);
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/* We don't have device anymore */
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dev_put(dev);
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dev = NULL;
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rtnl_unlock();
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NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
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NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, name);
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wpan_phy_put(phy);
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return ieee802154_nl_reply(msg, info);
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nla_put_failure:
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nlmsg_free(msg);
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out_dev:
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wpan_phy_put(phy);
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if (dev)
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dev_put(dev);
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return rc;
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}
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static struct genl_ops ieee802154_phy_ops[] = {
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IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
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ieee802154_dump_phy),
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IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
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IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
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};
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/*
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* No need to unregister as family unregistration will do it.
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*/
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int nl802154_phy_register(void)
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{
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int i;
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int rc;
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for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
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rc = genl_register_ops(&nl802154_family,
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&ieee802154_phy_ops[i]);
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if (rc)
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return rc;
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}
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return 0;
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}
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