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linux/net/ieee802154/nl-mac.c
Johannes Berg 2a94fe48f3 genetlink: make multicast groups const, prevent abuse 
Register generic netlink multicast groups as an array with
the family and give them contiguous group IDs. Then instead
of passing the global group ID to the various functions that
send messages, pass the ID relative to the family - for most
families that's just 0 because the only have one group.

This avoids the list_head and ID in each group, adding a new
field for the mcast group ID offset to the family.

At the same time, this allows us to prevent abusing groups
again like the quota and dropmon code did, since we can now
check that a family only uses a group it owns.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-11-19 16:39:06 -05:00

580 lines
15 KiB
C
Raw Blame History

/*
* Netlink inteface for IEEE 802.15.4 stack
*
* Copyright 2007, 2008 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Written by:
* Sergey Lapin <slapin@ossfans.org>
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Maxim Osipov <maxim.osipov@siemens.com>
*/
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/sock.h>
#include <linux/nl802154.h>
#include <linux/export.h>
#include <net/af_ieee802154.h>
#include <net/nl802154.h>
#include <net/ieee802154.h>
#include <net/ieee802154_netdev.h>
#include <net/wpan-phy.h>
#include "ieee802154.h"
int ieee802154_nl_assoc_indic(struct net_device *dev,
struct ieee802154_addr *addr, u8 cap)
{
struct sk_buff *msg;
pr_debug("%s\n", __func__);
if (addr->addr_type != IEEE802154_ADDR_LONG) {
pr_err("%s: received non-long source address!\n", __func__);
return -EINVAL;
}
msg = ieee802154_nl_create(0, IEEE802154_ASSOCIATE_INDIC);
if (!msg)
return -ENOBUFS;
if (nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name) ||
nla_put_u32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex) ||
nla_put(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
dev->dev_addr) ||
nla_put(msg, IEEE802154_ATTR_SRC_HW_ADDR, IEEE802154_ADDR_LEN,
addr->hwaddr) ||
nla_put_u8(msg, IEEE802154_ATTR_CAPABILITY, cap))
goto nla_put_failure;
return ieee802154_nl_mcast(msg, IEEE802154_COORD_MCGRP);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
EXPORT_SYMBOL(ieee802154_nl_assoc_indic);
int ieee802154_nl_assoc_confirm(struct net_device *dev, u16 short_addr,
u8 status)
{
struct sk_buff *msg;
pr_debug("%s\n", __func__);
msg = ieee802154_nl_create(0, IEEE802154_ASSOCIATE_CONF);
if (!msg)
return -ENOBUFS;
if (nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name) ||
nla_put_u32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex) ||
nla_put(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
dev->dev_addr) ||
nla_put_u16(msg, IEEE802154_ATTR_SHORT_ADDR, short_addr) ||
nla_put_u8(msg, IEEE802154_ATTR_STATUS, status))
goto nla_put_failure;
return ieee802154_nl_mcast(msg, IEEE802154_COORD_MCGRP);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
EXPORT_SYMBOL(ieee802154_nl_assoc_confirm);
int ieee802154_nl_disassoc_indic(struct net_device *dev,
struct ieee802154_addr *addr, u8 reason)
{
struct sk_buff *msg;
pr_debug("%s\n", __func__);
msg = ieee802154_nl_create(0, IEEE802154_DISASSOCIATE_INDIC);
if (!msg)
return -ENOBUFS;
if (nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name) ||
nla_put_u32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex) ||
nla_put(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
dev->dev_addr))
goto nla_put_failure;
if (addr->addr_type == IEEE802154_ADDR_LONG) {
if (nla_put(msg, IEEE802154_ATTR_SRC_HW_ADDR, IEEE802154_ADDR_LEN,
addr->hwaddr))
goto nla_put_failure;
} else {
if (nla_put_u16(msg, IEEE802154_ATTR_SRC_SHORT_ADDR,
addr->short_addr))
goto nla_put_failure;
}
if (nla_put_u8(msg, IEEE802154_ATTR_REASON, reason))
goto nla_put_failure;
return ieee802154_nl_mcast(msg, IEEE802154_COORD_MCGRP);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
EXPORT_SYMBOL(ieee802154_nl_disassoc_indic);
int ieee802154_nl_disassoc_confirm(struct net_device *dev, u8 status)
{
struct sk_buff *msg;
pr_debug("%s\n", __func__);
msg = ieee802154_nl_create(0, IEEE802154_DISASSOCIATE_CONF);
if (!msg)
return -ENOBUFS;
if (nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name) ||
nla_put_u32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex) ||
nla_put(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
dev->dev_addr) ||
nla_put_u8(msg, IEEE802154_ATTR_STATUS, status))
goto nla_put_failure;
return ieee802154_nl_mcast(msg, IEEE802154_COORD_MCGRP);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
EXPORT_SYMBOL(ieee802154_nl_disassoc_confirm);
int ieee802154_nl_beacon_indic(struct net_device *dev,
u16 panid, u16 coord_addr)
{
struct sk_buff *msg;
pr_debug("%s\n", __func__);
msg = ieee802154_nl_create(0, IEEE802154_BEACON_NOTIFY_INDIC);
if (!msg)
return -ENOBUFS;
if (nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name) ||
nla_put_u32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex) ||
nla_put(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
dev->dev_addr) ||
nla_put_u16(msg, IEEE802154_ATTR_COORD_SHORT_ADDR, coord_addr) ||
nla_put_u16(msg, IEEE802154_ATTR_COORD_PAN_ID, panid))
goto nla_put_failure;
return ieee802154_nl_mcast(msg, IEEE802154_COORD_MCGRP);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
EXPORT_SYMBOL(ieee802154_nl_beacon_indic);
int ieee802154_nl_scan_confirm(struct net_device *dev,
u8 status, u8 scan_type, u32 unscanned, u8 page,
u8 *edl/* , struct list_head *pan_desc_list */)
{
struct sk_buff *msg;
pr_debug("%s\n", __func__);
msg = ieee802154_nl_create(0, IEEE802154_SCAN_CONF);
if (!msg)
return -ENOBUFS;
if (nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name) ||
nla_put_u32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex) ||
nla_put(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
dev->dev_addr) ||
nla_put_u8(msg, IEEE802154_ATTR_STATUS, status) ||
nla_put_u8(msg, IEEE802154_ATTR_SCAN_TYPE, scan_type) ||
nla_put_u32(msg, IEEE802154_ATTR_CHANNELS, unscanned) ||
nla_put_u8(msg, IEEE802154_ATTR_PAGE, page) ||
(edl &&
nla_put(msg, IEEE802154_ATTR_ED_LIST, 27, edl)))
goto nla_put_failure;
return ieee802154_nl_mcast(msg, IEEE802154_COORD_MCGRP);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
EXPORT_SYMBOL(ieee802154_nl_scan_confirm);
int ieee802154_nl_start_confirm(struct net_device *dev, u8 status)
{
struct sk_buff *msg;
pr_debug("%s\n", __func__);
msg = ieee802154_nl_create(0, IEEE802154_START_CONF);
if (!msg)
return -ENOBUFS;
if (nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name) ||
nla_put_u32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex) ||
nla_put(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
dev->dev_addr) ||
nla_put_u8(msg, IEEE802154_ATTR_STATUS, status))
goto nla_put_failure;
return ieee802154_nl_mcast(msg, IEEE802154_COORD_MCGRP);
nla_put_failure:
nlmsg_free(msg);
return -ENOBUFS;
}
EXPORT_SYMBOL(ieee802154_nl_start_confirm);
static int ieee802154_nl_fill_iface(struct sk_buff *msg, u32 portid,
u32 seq, int flags, struct net_device *dev)
{
void *hdr;
struct wpan_phy *phy;
pr_debug("%s\n", __func__);
hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
IEEE802154_LIST_IFACE);
if (!hdr)
goto out;
phy = ieee802154_mlme_ops(dev)->get_phy(dev);
BUG_ON(!phy);
if (nla_put_string(msg, IEEE802154_ATTR_DEV_NAME, dev->name) ||
nla_put_string(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy)) ||
nla_put_u32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex) ||
nla_put(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
dev->dev_addr) ||
nla_put_u16(msg, IEEE802154_ATTR_SHORT_ADDR,
ieee802154_mlme_ops(dev)->get_short_addr(dev)) ||
nla_put_u16(msg, IEEE802154_ATTR_PAN_ID,
ieee802154_mlme_ops(dev)->get_pan_id(dev)))
goto nla_put_failure;
wpan_phy_put(phy);
return genlmsg_end(msg, hdr);
nla_put_failure:
wpan_phy_put(phy);
genlmsg_cancel(msg, hdr);
out:
return -EMSGSIZE;
}
/* Requests from userspace */
static struct net_device *ieee802154_nl_get_dev(struct genl_info *info)
{
struct net_device *dev;
if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
char name[IFNAMSIZ + 1];
nla_strlcpy(name, info->attrs[IEEE802154_ATTR_DEV_NAME],
sizeof(name));
dev = dev_get_by_name(&init_net, name);
} else if (info->attrs[IEEE802154_ATTR_DEV_INDEX])
dev = dev_get_by_index(&init_net,
nla_get_u32(info->attrs[IEEE802154_ATTR_DEV_INDEX]));
else
return NULL;
if (!dev)
return NULL;
if (dev->type != ARPHRD_IEEE802154) {
dev_put(dev);
return NULL;
}
return dev;
}
int ieee802154_associate_req(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct ieee802154_addr addr;
u8 page;
int ret = -EOPNOTSUPP;
if (!info->attrs[IEEE802154_ATTR_CHANNEL] ||
!info->attrs[IEEE802154_ATTR_COORD_PAN_ID] ||
(!info->attrs[IEEE802154_ATTR_COORD_HW_ADDR] &&
!info->attrs[IEEE802154_ATTR_COORD_SHORT_ADDR]) ||
!info->attrs[IEEE802154_ATTR_CAPABILITY])
return -EINVAL;
dev = ieee802154_nl_get_dev(info);
if (!dev)
return -ENODEV;
if (!ieee802154_mlme_ops(dev)->assoc_req)
goto out;
if (info->attrs[IEEE802154_ATTR_COORD_HW_ADDR]) {
addr.addr_type = IEEE802154_ADDR_LONG;
nla_memcpy(addr.hwaddr,
info->attrs[IEEE802154_ATTR_COORD_HW_ADDR],
IEEE802154_ADDR_LEN);
} else {
addr.addr_type = IEEE802154_ADDR_SHORT;
addr.short_addr = nla_get_u16(
info->attrs[IEEE802154_ATTR_COORD_SHORT_ADDR]);
}
addr.pan_id = nla_get_u16(info->attrs[IEEE802154_ATTR_COORD_PAN_ID]);
if (info->attrs[IEEE802154_ATTR_PAGE])
page = nla_get_u8(info->attrs[IEEE802154_ATTR_PAGE]);
else
page = 0;
ret = ieee802154_mlme_ops(dev)->assoc_req(dev, &addr,
nla_get_u8(info->attrs[IEEE802154_ATTR_CHANNEL]),
page,
nla_get_u8(info->attrs[IEEE802154_ATTR_CAPABILITY]));
out:
dev_put(dev);
return ret;
}
int ieee802154_associate_resp(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct ieee802154_addr addr;
int ret = -EOPNOTSUPP;
if (!info->attrs[IEEE802154_ATTR_STATUS] ||
!info->attrs[IEEE802154_ATTR_DEST_HW_ADDR] ||
!info->attrs[IEEE802154_ATTR_DEST_SHORT_ADDR])
return -EINVAL;
dev = ieee802154_nl_get_dev(info);
if (!dev)
return -ENODEV;
if (!ieee802154_mlme_ops(dev)->assoc_resp)
goto out;
addr.addr_type = IEEE802154_ADDR_LONG;
nla_memcpy(addr.hwaddr, info->attrs[IEEE802154_ATTR_DEST_HW_ADDR],
IEEE802154_ADDR_LEN);
addr.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
ret = ieee802154_mlme_ops(dev)->assoc_resp(dev, &addr,
nla_get_u16(info->attrs[IEEE802154_ATTR_DEST_SHORT_ADDR]),
nla_get_u8(info->attrs[IEEE802154_ATTR_STATUS]));
out:
dev_put(dev);
return ret;
}
int ieee802154_disassociate_req(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct ieee802154_addr addr;
int ret = -EOPNOTSUPP;
if ((!info->attrs[IEEE802154_ATTR_DEST_HW_ADDR] &&
!info->attrs[IEEE802154_ATTR_DEST_SHORT_ADDR]) ||
!info->attrs[IEEE802154_ATTR_REASON])
return -EINVAL;
dev = ieee802154_nl_get_dev(info);
if (!dev)
return -ENODEV;
if (!ieee802154_mlme_ops(dev)->disassoc_req)
goto out;
if (info->attrs[IEEE802154_ATTR_DEST_HW_ADDR]) {
addr.addr_type = IEEE802154_ADDR_LONG;
nla_memcpy(addr.hwaddr,
info->attrs[IEEE802154_ATTR_DEST_HW_ADDR],
IEEE802154_ADDR_LEN);
} else {
addr.addr_type = IEEE802154_ADDR_SHORT;
addr.short_addr = nla_get_u16(
info->attrs[IEEE802154_ATTR_DEST_SHORT_ADDR]);
}
addr.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
ret = ieee802154_mlme_ops(dev)->disassoc_req(dev, &addr,
nla_get_u8(info->attrs[IEEE802154_ATTR_REASON]));
out:
dev_put(dev);
return ret;
}
/*
* PANid, channel, beacon_order = 15, superframe_order = 15,
* PAN_coordinator, battery_life_extension = 0,
* coord_realignment = 0, security_enable = 0
*/
int ieee802154_start_req(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct ieee802154_addr addr;
u8 channel, bcn_ord, sf_ord;
u8 page;
int pan_coord, blx, coord_realign;
int ret = -EOPNOTSUPP;
if (!info->attrs[IEEE802154_ATTR_COORD_PAN_ID] ||
!info->attrs[IEEE802154_ATTR_COORD_SHORT_ADDR] ||
!info->attrs[IEEE802154_ATTR_CHANNEL] ||
!info->attrs[IEEE802154_ATTR_BCN_ORD] ||
!info->attrs[IEEE802154_ATTR_SF_ORD] ||
!info->attrs[IEEE802154_ATTR_PAN_COORD] ||
!info->attrs[IEEE802154_ATTR_BAT_EXT] ||
!info->attrs[IEEE802154_ATTR_COORD_REALIGN]
)
return -EINVAL;
dev = ieee802154_nl_get_dev(info);
if (!dev)
return -ENODEV;
if (!ieee802154_mlme_ops(dev)->start_req)
goto out;
addr.addr_type = IEEE802154_ADDR_SHORT;
addr.short_addr = nla_get_u16(
info->attrs[IEEE802154_ATTR_COORD_SHORT_ADDR]);
addr.pan_id = nla_get_u16(info->attrs[IEEE802154_ATTR_COORD_PAN_ID]);
channel = nla_get_u8(info->attrs[IEEE802154_ATTR_CHANNEL]);
bcn_ord = nla_get_u8(info->attrs[IEEE802154_ATTR_BCN_ORD]);
sf_ord = nla_get_u8(info->attrs[IEEE802154_ATTR_SF_ORD]);
pan_coord = nla_get_u8(info->attrs[IEEE802154_ATTR_PAN_COORD]);
blx = nla_get_u8(info->attrs[IEEE802154_ATTR_BAT_EXT]);
coord_realign = nla_get_u8(info->attrs[IEEE802154_ATTR_COORD_REALIGN]);
if (info->attrs[IEEE802154_ATTR_PAGE])
page = nla_get_u8(info->attrs[IEEE802154_ATTR_PAGE]);
else
page = 0;
if (addr.short_addr == IEEE802154_ADDR_BROADCAST) {
ieee802154_nl_start_confirm(dev, IEEE802154_NO_SHORT_ADDRESS);
dev_put(dev);
return -EINVAL;
}
ret = ieee802154_mlme_ops(dev)->start_req(dev, &addr, channel, page,
bcn_ord, sf_ord, pan_coord, blx, coord_realign);
out:
dev_put(dev);
return ret;
}
int ieee802154_scan_req(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
int ret = -EOPNOTSUPP;
u8 type;
u32 channels;
u8 duration;
u8 page;
if (!info->attrs[IEEE802154_ATTR_SCAN_TYPE] ||
!info->attrs[IEEE802154_ATTR_CHANNELS] ||
!info->attrs[IEEE802154_ATTR_DURATION])
return -EINVAL;
dev = ieee802154_nl_get_dev(info);
if (!dev)
return -ENODEV;
if (!ieee802154_mlme_ops(dev)->scan_req)
goto out;
type = nla_get_u8(info->attrs[IEEE802154_ATTR_SCAN_TYPE]);
channels = nla_get_u32(info->attrs[IEEE802154_ATTR_CHANNELS]);
duration = nla_get_u8(info->attrs[IEEE802154_ATTR_DURATION]);
if (info->attrs[IEEE802154_ATTR_PAGE])
page = nla_get_u8(info->attrs[IEEE802154_ATTR_PAGE]);
else
page = 0;
ret = ieee802154_mlme_ops(dev)->scan_req(dev, type, channels, page,
duration);
out:
dev_put(dev);
return ret;
}
int ieee802154_list_iface(struct sk_buff *skb, struct genl_info *info)
{
/* Request for interface name, index, type, IEEE address,
PAN Id, short address */
struct sk_buff *msg;
struct net_device *dev = NULL;
int rc = -ENOBUFS;
pr_debug("%s\n", __func__);
dev = ieee802154_nl_get_dev(info);
if (!dev)
return -ENODEV;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
goto out_dev;
rc = ieee802154_nl_fill_iface(msg, info->snd_portid, info->snd_seq,
0, dev);
if (rc < 0)
goto out_free;
dev_put(dev);
return genlmsg_reply(msg, info);
out_free:
nlmsg_free(msg);
out_dev:
dev_put(dev);
return rc;
}
int ieee802154_dump_iface(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct net_device *dev;
int idx;
int s_idx = cb->args[0];
pr_debug("%s\n", __func__);
idx = 0;
for_each_netdev(net, dev) {
if (idx < s_idx || (dev->type != ARPHRD_IEEE802154))
goto cont;
if (ieee802154_nl_fill_iface(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI, dev) < 0)
break;
cont:
idx++;
}
cb->args[0] = idx;
return skb->len;
}
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