[PATCH v3] nl80211: Receive correct value for NL80211_MESHCONF_HT_OPMODE command
From: Masashi Honma <hidden>
Date: 2016-08-03 01:20:01
Subsystem:
802.11 (including cfg80211/nl80211), the rest · Maintainers:
Johannes Berg, Linus Torvalds
Previously, NL80211_MESHCONF_HT_OPMODE rejected correct flag combination, ex) IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT. This was caused by simple comparison with value 16. This causes setting non-existent flag (like 0x08) and invalid flag combinations. So this commit implements some checks based on IEEE 802.11 2012 8.4.2.59 HT Operation element. Signed-off-by: Masashi Honma <redacted> --- net/wireless/nl80211.c | 42 +++++++++++++++++++++++++++++++++++++++--- 1 file changed, 39 insertions(+), 3 deletions(-)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 46417f9..7b7530d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c@@ -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 +5472,44 @@ 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: + if (ht_opmode & IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT) + return -EINVAL; + break; + case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER: + if (!(ht_opmode & + IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT)) + return -EINVAL; + break; + 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_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,
--
2.7.4