diff options
| author | Helmut Schaa <helmut.schaa@googlemail.com> | 2012-11-27 18:23:06 +0100 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2012-11-28 13:52:43 +0100 |
| commit | 478622e81c735ecd83d45ee6be3fd45d500aaa3b (patch) | |
| tree | 631025a1b4b881e9ed179bc39d57f82b5cb13827 | |
| parent | 0624760c96da3ffeaec8027a016475ae752d75e1 (diff) | |
mac80211: reject setting masked mac addresses
If a driver registers an address mask we should ensure that no
interface gets an address assigned that isn't covered by the
registered address mask. This prevents invalid configurations
from reaching the device and causing problems.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
[change function flow to reduce indentation, fix locking]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | net/mac80211/iface.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 5331662489f..40c36d5d737 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -223,6 +223,47 @@ static int ieee80211_change_mtu(struct net_device *dev, int new_mtu) return 0; } +static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr) +{ + struct ieee80211_sub_if_data *sdata; + u64 new, mask, tmp; + u8 *m; + int ret = 0; + + if (is_zero_ether_addr(local->hw.wiphy->addr_mask)) + return 0; + + m = addr; + new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | + ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | + ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); + + m = local->hw.wiphy->addr_mask; + mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | + ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | + ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); + + + mutex_lock(&local->iflist_mtx); + list_for_each_entry(sdata, &local->interfaces, list) { + if (sdata->vif.type == NL80211_IFTYPE_MONITOR) + continue; + + m = sdata->vif.addr; + tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) | + ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) | + ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8); + + if ((new & ~mask) != (tmp & ~mask)) { + ret = -EINVAL; + break; + } + } + mutex_unlock(&local->iflist_mtx); + + return ret; +} + static int ieee80211_change_mac(struct net_device *dev, void *addr) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); @@ -232,6 +273,10 @@ static int ieee80211_change_mac(struct net_device *dev, void *addr) if (ieee80211_sdata_running(sdata)) return -EBUSY; + ret = ieee80211_verify_mac(sdata->local, sa->sa_data); + if (ret) + return ret; + ret = eth_mac_addr(dev, sa); if (ret == 0) |