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nl80211: correct checks for NL80211_MESHCONF_HT_OPMODE value 

Previously, NL80211_MESHCONF_HT_OPMODE validation rejected correct
flag combinations, e.g. IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED |
IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT.

Doing just a range-check allows setting flags that don't exist (0x8)
and invalid flag combinations.

Implements some checks based on IEEE 802.11 2012 8.4.2.59 "HT
Operation element".

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>
[reword commit message, simplify a bit]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Masashi Honma 2016-08-03 10:07:44 +09:00 committed by Johannes Berg
parent 71f2c3470f
commit 9757235f45
1 changed files with 31 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
net/wireless/nl80211.c
View File

@ -5380,6 +5380,7 @@ static int nl80211_parse_mesh_config(struct genl_info *info,
{
struct nlattr *tb[NL80211_MESHCONF_ATTR_MAX + 1];
u32 mask = 0;
u16 ht_opmode;
#define FILL_IN_MESH_PARAM_IF_SET(tb, cfg, param, min, max, mask, attr, fn) \
do { \
@ -5471,9 +5472,36 @@ do { \
FILL_IN_MESH_PARAM_IF_SET(tb, cfg, rssi_threshold, -255, 0,
mask, NL80211_MESHCONF_RSSI_THRESHOLD,
nl80211_check_s32);
FILL_IN_MESH_PARAM_IF_SET(tb, cfg, ht_opmode, 0, 16,
mask, NL80211_MESHCONF_HT_OPMODE,
nl80211_check_u16);
/*
* Check HT operation mode based on
* IEEE 802.11 2012 8.4.2.59 HT Operation element.
*/
if (tb[NL80211_MESHCONF_HT_OPMODE]) {
ht_opmode = nla_get_u16(tb[NL80211_MESHCONF_HT_OPMODE]);
if (ht_opmode & ~(IEEE80211_HT_OP_MODE_PROTECTION |
IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT |
IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT))
return -EINVAL;
if ((ht_opmode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT) &&
(ht_opmode & IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT))
return -EINVAL;
switch (ht_opmode & IEEE80211_HT_OP_MODE_PROTECTION) {
case IEEE80211_HT_OP_MODE_PROTECTION_NONE:
case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ:
if (ht_opmode & IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT)
return -EINVAL;
break;
case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER:
case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED:
if (!(ht_opmode & IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT))
return -EINVAL;
break;
}
cfg->ht_opmode = ht_opmode;
}
FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPactivePathToRootTimeout,
1, 65535, mask,
NL80211_MESHCONF_HWMP_PATH_TO_ROOT_TIMEOUT,