mac802154: iface: check concurrent ifaces

This patch adds a check for concurrent interfaces while calling
interface up. This avoids to have different mac parameters on one phy.
Otherwise it could be that a interface can overwrite current phy mac
settings which is set by an another interface.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 77 insertions, 0 deletions

diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c
index 9ae893057dd7..61f3ff00a508 100644
--- a/net/mac802154/iface.c
+++ b/net/mac802154/iface.c
@@ -175,6 +175,79 @@ err:
         return res;
 }
 
+static int
+ieee802154_check_mac_settings(struct ieee802154_local *local,
+                              struct wpan_dev *wpan_dev,
+                              struct wpan_dev *nwpan_dev)
+{
+        ASSERT_RTNL();
+
+        if (local->hw.flags & IEEE802154_HW_PROMISCUOUS) {
+                if (wpan_dev->promiscuous_mode != nwpan_dev->promiscuous_mode)
+                        return -EBUSY;
+        }
+
+        if (local->hw.flags & IEEE802154_HW_AFILT) {
+                if (wpan_dev->pan_id != nwpan_dev->pan_id)
+                        return -EBUSY;
+
+                if (wpan_dev->short_addr != nwpan_dev->short_addr)
+                        return -EBUSY;
+
+                if (wpan_dev->extended_addr != nwpan_dev->extended_addr)
+                        return -EBUSY;
+        }
+
+        if (local->hw.flags & IEEE802154_HW_CSMA_PARAMS) {
+                if (wpan_dev->min_be != nwpan_dev->min_be)
+                        return -EBUSY;
+
+                if (wpan_dev->max_be != nwpan_dev->max_be)
+                        return -EBUSY;
+
+                if (wpan_dev->csma_retries != nwpan_dev->csma_retries)
+                        return -EBUSY;
+        }
+
+        if (local->hw.flags & IEEE802154_HW_FRAME_RETRIES) {
+                if (wpan_dev->frame_retries != nwpan_dev->frame_retries)
+                        return -EBUSY;
+        }
+
+        if (local->hw.flags & IEEE802154_HW_LBT) {
+                if (wpan_dev->lbt != nwpan_dev->lbt)
+                        return -EBUSY;
+        }
+
+        return 0;
+}
+
+static int
+ieee802154_check_concurrent_iface(struct ieee802154_sub_if_data *sdata,
+                                  enum nl802154_iftype iftype)
+{
+        struct ieee802154_local *local = sdata->local;
+        struct wpan_dev *wpan_dev = &sdata->wpan_dev;
+        struct ieee802154_sub_if_data *nsdata;
+
+        /* we hold the RTNL here so can safely walk the list */
+        list_for_each_entry(nsdata, &local->interfaces, list) {
+                if (nsdata != sdata && ieee802154_sdata_running(nsdata)) {
+                        int ret;
+
+                        /* check all phy mac sublayer settings are the same.
+                         * We have only one phy, different values makes trouble.
+                         */
+                        ret = ieee802154_check_mac_settings(local, wpan_dev,
+                                                            &nsdata->wpan_dev);
+                        if (ret < 0)
+                                return ret;
+                }
+        }
+
+        return 0;
+}
+
 static int mac802154_wpan_open(struct net_device *dev)
 {
         int rc;
@@ -183,6 +256,10 @@ static int mac802154_wpan_open(struct net_device *dev)
         struct wpan_dev *wpan_dev = &sdata->wpan_dev;
         struct wpan_phy *phy = sdata->local->phy;
 
+        rc = ieee802154_check_concurrent_iface(sdata, sdata->vif.type);
+        if (rc < 0)
+                return rc;
+
         rc = mac802154_slave_open(dev);
         if (rc < 0)
                 return rc;