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{nl,mac}80211: allow 4addr AP operation on crypto controlled devices

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As per the current design, in the case of sw crypto controlled devices,
it is the device which advertises the support for AP/VLAN iftype based
on it's ability to tranmsit packets encrypted in software
(In VLAN functionality, group traffic generated for a specific
VLAN group is always encrypted in software). Commit db3bdcb9c3
("mac80211: allow AP_VLAN operation on crypto controlled devices")
has introduced this change.

Since 4addr AP operation also uses AP/VLAN iftype, this conditional
way of advertising AP/VLAN support has broken 4addr AP mode operation on
crypto controlled devices which do not support VLAN functionality.

In the case of ath10k driver, not all firmwares have support for VLAN
functionality but all can support 4addr AP operation. Because AP/VLAN
support is not advertised for these devices, 4addr AP operations are
also blocked.

Fix this by allowing 4addr operation on devices which do not support
AP/VLAN iftype but can support 4addr AP operation (decision is based on
the wiphy flag WIPHY_FLAG_4ADDR_AP).

Cc: stable@vger.kernel.org
Fixes: db3bdcb9c3 ("mac80211: allow AP_VLAN operation on crypto controlled devices")
Signed-off-by: Manikanta Pubbisetty <mpubbise@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Manikanta Pubbisetty 2019-05-08 14:55:33 +05:30 committed by Johannes Berg
parent 85a55ff2cf
commit 33d915d9e8
4 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/cfg80211.h
View File

@ -3839,7 +3839,8 @@ struct cfg80211_ops {
* on wiphy_new(), but can be changed by the driver if it has a good * on wiphy_new(), but can be changed by the driver if it has a good
* reason to override the default * reason to override the default
* @WIPHY_FLAG_4ADDR_AP: supports 4addr mode even on AP (with a single station * @WIPHY_FLAG_4ADDR_AP: supports 4addr mode even on AP (with a single station
* on a VLAN interface) * on a VLAN interface). This flag also serves an extra purpose of
* supporting 4ADDR AP mode on devices which do not support AP/VLAN iftype.
* @WIPHY_FLAG_4ADDR_STATION: supports 4addr mode even as a station * @WIPHY_FLAG_4ADDR_STATION: supports 4addr mode even as a station
* @WIPHY_FLAG_CONTROL_PORT_PROTOCOL: This device supports setting the * @WIPHY_FLAG_CONTROL_PORT_PROTOCOL: This device supports setting the
* control port protocol ethertype. The device also honours the * control port protocol ethertype. The device also honours the

4
net/mac80211/util.c
View File

@ -3795,7 +3795,9 @@ int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
} }
/* Always allow software iftypes */ /* Always allow software iftypes */
if (local->hw.wiphy->software_iftypes & BIT(iftype)) { if (local->hw.wiphy->software_iftypes & BIT(iftype) ||
(iftype == NL80211_IFTYPE_AP_VLAN &&
local->hw.wiphy->flags & WIPHY_FLAG_4ADDR_AP)) {
if (radar_detect) if (radar_detect)
return -EINVAL; return -EINVAL;
return 0; return 0;

6
net/wireless/core.c
View File

@ -1396,8 +1396,12 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
} }
break; break;
case NETDEV_PRE_UP: case NETDEV_PRE_UP:
if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)) &&
!(wdev->iftype == NL80211_IFTYPE_AP_VLAN &&
rdev->wiphy.flags & WIPHY_FLAG_4ADDR_AP &&
wdev->use_4addr))
return notifier_from_errno(-EOPNOTSUPP); return notifier_from_errno(-EOPNOTSUPP);
if (rfkill_blocked(rdev->rfkill)) if (rfkill_blocked(rdev->rfkill))
return notifier_from_errno(-ERFKILL); return notifier_from_errno(-ERFKILL);
break; break;

8
net/wireless/nl80211.c
View File

@ -3419,8 +3419,7 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
if (info->attrs[NL80211_ATTR_IFTYPE]) if (info->attrs[NL80211_ATTR_IFTYPE])
type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]); type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
if (!rdev->ops->add_virtual_intf || if (!rdev->ops->add_virtual_intf)
!(rdev->wiphy.interface_modes & (1 << type)))
return -EOPNOTSUPP; return -EOPNOTSUPP;
if ((type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN || if ((type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN ||
@ -3439,6 +3438,11 @@ static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
return err; return err;
} }
if (!(rdev->wiphy.interface_modes & (1 << type)) &&
!(type == NL80211_IFTYPE_AP_VLAN && params.use_4addr &&
rdev->wiphy.flags & WIPHY_FLAG_4ADDR_AP))
return -EOPNOTSUPP;
err = nl80211_parse_mon_options(rdev, type, info, &params); err = nl80211_parse_mon_options(rdev, type, info, &params);
if (err < 0) if (err < 0)
return err; return err;