This allows users to prevent a vif from affecting radios other than the
configured ones. This can be useful in cases where e.g. an AP is running
on one radio, and triggering a scan on another radio should not disturb it.
Changing the allowed radios list for a vif is supported, but only while
it is down.
While it is possible to achieve the same by always explicitly specifying
a frequency list for scan requests and ensuring that the wrong channel/band
is never accidentally set on an unrelated interface, this change makes
multi-radio wiphy setups a lot easier to deal with for CLI users.
By itself, this patch only enforces the radio mask for scanning requests.
Follow-up changes build on this to limit configurable frequencies and
remain-on-channel requests.
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
---
include/net/cfg80211.h | 12 ++++++++-
include/uapi/linux/nl80211.h | 5 +++-
net/wireless/nl80211.c | 58 +++++++++++++++++++++++++++++++------
net/wireless/scan.c | 10 ++++--
net/wireless/util.c | 29 +++++++++++++++++++-
5 files changed, 103 insertions(+), 11 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 69ec1eb41a09..73df4a8e8cce 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -6223,6 +6223,7 @@ enum ieee80211_ap_reg_power {
* entered.
* @links.cac_time_ms: CAC time in ms
* @valid_links: bitmap describing what elements of @links are valid
+ * @radio_mask: Bitmask of radios that this interface is allowed to operate on.
*/
struct wireless_dev {
struct wiphy *wiphy;
@@ -6335,6 +6336,8 @@ struct wireless_dev {
unsigned int cac_time_ms;
} links[IEEE80211_MLD_MAX_NUM_LINKS];
u16 valid_links;
+
+ u32 radio_mask;
};
static inline const u8 *wdev_address(struct wireless_dev *wdev)
@@ -6521,6 +6524,15 @@ bool cfg80211_radio_chandef_valid(const struct wiphy_radio *radio,
const struct cfg80211_chan_def *chandef);
/**
+ * cfg80211_wdev_channel_allowed - Check if the wdev may use the channel
+ *
+ * @wdev: the wireless device
+ * @chan: channel to check
+ */
+bool cfg80211_wdev_channel_allowed(struct wireless_dev *wdev,
+ struct ieee80211_channel *chan);
+
+/**
* ieee80211_get_response_rate - get basic rate for a given rate
*
* @sband: the band to look for rates in
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index f97f5adc8d51..d31ccee99cc7 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2868,6 +2868,9 @@ enum nl80211_commands {
* nested item, it contains attributes defined in
* &enum nl80211_if_combination_attrs.
*
+ * @NL80211_ATTR_VIF_RADIO_MASK: Bitmask of allowed radios (u32).
+ * A value of 0 means all radios.
+ *
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -3416,6 +3419,8 @@ enum nl80211_attrs {
NL80211_ATTR_WIPHY_RADIOS,
NL80211_ATTR_WIPHY_INTERFACE_COMBINATIONS,
+ NL80211_ATTR_VIF_RADIO_MASK,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 9ab777e0bd4d..8f86b23e106a 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -829,6 +829,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_MLO_TTLM_DLINK] = NLA_POLICY_EXACT_LEN(sizeof(u16) * 8),
[NL80211_ATTR_MLO_TTLM_ULINK] = NLA_POLICY_EXACT_LEN(sizeof(u16) * 8),
[NL80211_ATTR_ASSOC_SPP_AMSDU] = { .type = NLA_FLAG },
+ [NL80211_ATTR_VIF_RADIO_MASK] = { .type = NLA_U32 },
};
/* policy for the key attributes */
@@ -3996,7 +3997,8 @@ static int nl80211_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flag
nla_put_u32(msg, NL80211_ATTR_GENERATION,
rdev->devlist_generation ^
(cfg80211_rdev_list_generation << 2)) ||
- nla_put_u8(msg, NL80211_ATTR_4ADDR, wdev->use_4addr))
+ nla_put_u8(msg, NL80211_ATTR_4ADDR, wdev->use_4addr) ||
+ nla_put_u32(msg, NL80211_ATTR_VIF_RADIO_MASK, wdev->radio_mask))
goto nla_put_failure;
if (rdev->ops->get_channel && !wdev->valid_links) {
@@ -4312,6 +4314,27 @@ static int nl80211_valid_4addr(struct cfg80211_registered_device *rdev,
return -EOPNOTSUPP;
}
+static int nl80211_parse_vif_radio_mask(struct genl_info *info,
+ u32 *radio_mask)
+{
+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
+ struct nlattr *attr = info->attrs[NL80211_ATTR_VIF_RADIO_MASK];
+ u32 mask, allowed;
+
+ if (!attr)
+ return 0;
+
+ allowed = BIT(rdev->wiphy.n_radio) - 1;
+ mask = nla_get_u32(attr);
+ if (mask & ~allowed)
+ return -EINVAL;
+ if (!mask)
+ mask = allowed;
+ *radio_mask = mask;
+
+ return 1;
+}
+
static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
@@ -4319,6 +4342,8 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
int err;
enum nl80211_iftype otype, ntype;
struct net_device *dev = info->user_ptr[1];
+ struct wireless_dev *wdev = dev->ieee80211_ptr;
+ u32 radio_mask = 0;
bool change = false;
memset(¶ms, 0, sizeof(params));
@@ -4332,8 +4357,6 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
}
if (info->attrs[NL80211_ATTR_MESH_ID]) {
- struct wireless_dev *wdev = dev->ieee80211_ptr;
-
if (ntype != NL80211_IFTYPE_MESH_POINT)
return -EINVAL;
if (otype != NL80211_IFTYPE_MESH_POINT)
@@ -4364,6 +4387,12 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
if (err > 0)
change = true;
+ err = nl80211_parse_vif_radio_mask(info, &radio_mask);
+ if (err < 0)
+ return err;
+ if (radio_mask && netif_running(dev))
+ return -EBUSY;
+
if (change)
err = cfg80211_change_iface(rdev, dev, ntype, ¶ms);
else
@@ -4372,11 +4401,11 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
if (!err && params.use_4addr != -1)
dev->ieee80211_ptr->use_4addr = params.use_4addr;
- if (change && !err) {
- struct wireless_dev *wdev = dev->ieee80211_ptr;
+ if (radio_mask)
+ wdev->radio_mask = radio_mask;
+ if (change && !err)
nl80211_notify_iface(rdev, wdev, NL80211_CMD_SET_INTERFACE);
- }
return err;
}
@@ -4387,6 +4416,7 @@ static int _nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
struct vif_params params;
struct wireless_dev *wdev;
struct sk_buff *msg;
+ u32 radio_mask;
int err;
enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
@@ -4424,6 +4454,11 @@ static int _nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
if (err < 0)
return err;
+ radio_mask = BIT(rdev->wiphy.n_radio) - 1;
+ err = nl80211_parse_vif_radio_mask(info, &radio_mask);
+ if (err < 0)
+ return err;
+
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
@@ -4465,6 +4500,8 @@ static int _nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
break;
}
+ wdev->radio_mask = radio_mask;
+
if (nl80211_send_iface(msg, info->snd_portid, info->snd_seq, 0,
rdev, wdev, NL80211_CMD_NEW_INTERFACE) < 0) {
nlmsg_free(msg);
@@ -9180,6 +9217,9 @@ static bool cfg80211_off_channel_oper_allowed(struct wireless_dev *wdev,
lockdep_assert_wiphy(wdev->wiphy);
+ if (!cfg80211_wdev_channel_allowed(wdev, chan))
+ return false;
+
if (!cfg80211_beaconing_iface_active(wdev))
return true;
@@ -9392,7 +9432,8 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
}
/* ignore disabled channels */
- if (chan->flags & IEEE80211_CHAN_DISABLED)
+ if (chan->flags & IEEE80211_CHAN_DISABLED ||
+ !cfg80211_wdev_channel_allowed(wdev, chan))
continue;
request->channels[i] = chan;
@@ -9412,7 +9453,8 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
chan = &wiphy->bands[band]->channels[j];
- if (chan->flags & IEEE80211_CHAN_DISABLED)
+ if (chan->flags & IEEE80211_CHAN_DISABLED ||
+ !cfg80211_wdev_channel_allowed(wdev, chan))
continue;
request->channels[i] = chan;
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 59a90bf3c0d6..279af47651c1 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -956,7 +956,8 @@ static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
struct ieee80211_channel *chan =
ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
- if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
+ if (!chan || chan->flags & IEEE80211_CHAN_DISABLED ||
+ !cfg80211_wdev_channel_allowed(rdev_req->wdev, chan))
continue;
for (i = 0; i < rdev_req->n_channels; i++) {
@@ -3515,9 +3516,12 @@ int cfg80211_wext_siwscan(struct net_device *dev,
continue;
for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
+ struct ieee80211_channel *chan;
+
/* ignore disabled channels */
- if (wiphy->bands[band]->channels[j].flags &
- IEEE80211_CHAN_DISABLED)
+ chan = &wiphy->bands[band]->channels[j];
+ if (chan->flags & IEEE80211_CHAN_DISABLED ||
+ !cfg80211_wdev_channel_allowed(creq->wdev, chan))
continue;
/* If we have a wireless request structure and the
diff --git a/net/wireless/util.c b/net/wireless/util.c
index f49b55724f83..9ccc9602ac25 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -2923,3 +2923,32 @@ bool cfg80211_radio_chandef_valid(const struct wiphy_radio *radio,
return true;
}
EXPORT_SYMBOL(cfg80211_radio_chandef_valid);
+
+bool cfg80211_wdev_channel_allowed(struct wireless_dev *wdev,
+ struct ieee80211_channel *chan)
+{
+ struct wiphy *wiphy = wdev->wiphy;
+ const struct wiphy_radio *radio;
+ struct cfg80211_chan_def chandef;
+ u32 radio_mask;
+ int i;
+
+ radio_mask = wdev->radio_mask;
+ if (!wiphy->n_radio || radio_mask == BIT(wiphy->n_radio) - 1)
+ return true;
+
+ cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_HT20);
+ for (i = 0; i < wiphy->n_radio; i++) {
+ if (!(radio_mask & BIT(i)))
+ continue;
+
+ radio = &wiphy->radio[i];
+ if (!cfg80211_radio_chandef_valid(radio, &chandef))
+ continue;
+
+ return true;
+ }
+
+ return false;
+}
+EXPORT_SYMBOL(cfg80211_wdev_channel_allowed);
--
git-series 0.9.1
