rndis_wlan: Implement cfg80211 PMKSA API

Add support for cfg80211 set_pmksa/del_pmksa/flush_pmksa. Updating PMKID
entry list is done on driver side since NDIS API requires full list update.

v2:
 - fixed to use new netdev_dbg/warn/etc instead of old devdbg/warn/etc
 - fixed false padding from struct ndis_80211_bssid_info

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 282 insertions, 0 deletions

diff --git a/drivers/net/wireless/rndis_wlan.c b/drivers/net/wireless/rndis_wlan.c
index 3433461995a7..267afd714c74 100644
--- a/drivers/net/wireless/rndis_wlan.c
+++ b/drivers/net/wireless/rndis_wlan.c
@@ -372,6 +372,17 @@ struct ndis_80211_capability {
         struct ndis_80211_auth_encr_pair auth_encr_pair[0];
 } __attribute__((packed));
 
+struct ndis_80211_bssid_info {
+        u8 bssid[6];
+        u8 pmkid[16];
+};
+
+struct ndis_80211_pmkid {
+        __le32 length;
+        __le32 bssid_info_count;
+        struct ndis_80211_bssid_info bssid_info[0];
+};
+
 /*
  *  private data
  */
@@ -542,6 +553,14 @@ static int rndis_get_station(struct wiphy *wiphy, struct net_device *dev,
 static int rndis_dump_station(struct wiphy *wiphy, struct net_device *dev,
                                int idx, u8 *mac, struct station_info *sinfo);
 
+static int rndis_set_pmksa(struct wiphy *wiphy, struct net_device *netdev,
+                                struct cfg80211_pmksa *pmksa);
+
+static int rndis_del_pmksa(struct wiphy *wiphy, struct net_device *netdev,
+                                struct cfg80211_pmksa *pmksa);
+
+static int rndis_flush_pmksa(struct wiphy *wiphy, struct net_device *netdev);
+
 static struct cfg80211_ops rndis_config_ops = {
         .change_virtual_intf = rndis_change_virtual_intf,
         .scan = rndis_scan,
@@ -558,6 +577,9 @@ static struct cfg80211_ops rndis_config_ops = {
         .set_default_key = rndis_set_default_key,
         .get_station = rndis_get_station,
         .dump_station = rndis_dump_station,
+        .set_pmksa = rndis_set_pmksa,
+        .del_pmksa = rndis_del_pmksa,
+        .flush_pmksa = rndis_flush_pmksa,
 };
 
 static void *rndis_wiphy_privid = &rndis_wiphy_privid;
@@ -1580,6 +1602,194 @@ static void set_multicast_list(struct usbnet *usbdev)
                    le32_to_cpu(filter), ret);
 }
 
+#ifdef DEBUG
+static void debug_print_pmkids(struct usbnet *usbdev,
+                                struct ndis_80211_pmkid *pmkids,
+                                const char *func_str)
+{
+        struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
+        int i, len, count, max_pmkids, entry_len;
+
+        max_pmkids = priv->wdev.wiphy->max_num_pmkids;
+        len = le32_to_cpu(pmkids->length);
+        count = le32_to_cpu(pmkids->bssid_info_count);
+
+        entry_len = (count > 0) ? (len - sizeof(*pmkids)) / count : -1;
+
+        netdev_dbg(usbdev->net, "%s(): %d PMKIDs (data len: %d, entry len: "
+                                "%d)\n", func_str, count, len, entry_len);
+
+        if (count > max_pmkids)
+                count = max_pmkids;
+
+        for (i = 0; i < count; i++) {
+                u32 *tmp = (u32 *)pmkids->bssid_info[i].pmkid;
+
+                netdev_dbg(usbdev->net, "%s():  bssid: %pM, "
+                                "pmkid: %08X:%08X:%08X:%08X\n",
+                                func_str, pmkids->bssid_info[i].bssid,
+                                cpu_to_be32(tmp[0]), cpu_to_be32(tmp[1]),
+                                cpu_to_be32(tmp[2]), cpu_to_be32(tmp[3]));
+        }
+}
+#else
+static void debug_print_pmkids(struct usbnet *usbdev,
+                                struct ndis_80211_pmkid *pmkids,
+                                const char *func_str)
+{
+        return;
+}
+#endif
+
+static struct ndis_80211_pmkid *get_device_pmkids(struct usbnet *usbdev)
+{
+        struct rndis_wlan_private *priv = get_rndis_wlan_priv(usbdev);
+        struct ndis_80211_pmkid *pmkids;
+        int len, ret, max_pmkids;
+
+        max_pmkids = priv->wdev.wiphy->max_num_pmkids;
+        len = sizeof(*pmkids) + max_pmkids * sizeof(pmkids->bssid_info[0]);
+
+        pmkids = kzalloc(len, GFP_KERNEL);
+        if (!pmkids)
+                return ERR_PTR(-ENOMEM);
+
+        pmkids->length = cpu_to_le32(len);
+        pmkids->bssid_info_count = cpu_to_le32(max_pmkids);
+
+        ret = rndis_query_oid(usbdev, OID_802_11_PMKID, pmkids, &len);
+        if (ret < 0) {
+                netdev_dbg(usbdev->net, "%s(): OID_802_11_PMKID(%d, %d)"
+                                " -> %d\n", __func__, len, max_pmkids, ret);
+
+                kfree(pmkids);
+                return ERR_PTR(ret);
+        }
+
+        if (le32_to_cpu(pmkids->bssid_info_count) > max_pmkids)
+                pmkids->bssid_info_count = cpu_to_le32(max_pmkids);
+
+        debug_print_pmkids(usbdev, pmkids, __func__);
+
+        return pmkids;
+}
+
+static int set_device_pmkids(struct usbnet *usbdev,
+                                struct ndis_80211_pmkid *pmkids)
+{
+        int ret, len, num_pmkids;
+
+        num_pmkids = le32_to_cpu(pmkids->bssid_info_count);
+        len = sizeof(*pmkids) + num_pmkids * sizeof(pmkids->bssid_info[0]);
+        pmkids->length = cpu_to_le32(len);
+
+        debug_print_pmkids(usbdev, pmkids, __func__);
+
+        ret = rndis_set_oid(usbdev, OID_802_11_PMKID, pmkids,
+                                                le32_to_cpu(pmkids->length));
+        if (ret < 0) {
+                netdev_dbg(usbdev->net, "%s(): OID_802_11_PMKID(%d, %d) -> %d"
+                                "\n", __func__, len, num_pmkids, ret);
+        }
+
+        kfree(pmkids);
+        return ret;
+}
+
+static struct ndis_80211_pmkid *remove_pmkid(struct usbnet *usbdev,
+                                                struct ndis_80211_pmkid *pmkids,
+                                                struct cfg80211_pmksa *pmksa,
+                                                int max_pmkids)
+{
+        int i, len, count, newlen, err;
+
+        len = le32_to_cpu(pmkids->length);
+        count = le32_to_cpu(pmkids->bssid_info_count);
+
+        if (count > max_pmkids)
+                count = max_pmkids;
+
+        for (i = 0; i < count; i++)
+                if (!compare_ether_addr(pmkids->bssid_info[i].bssid,
+                                                        pmksa->bssid))
+                        break;
+
+        /* pmkid not found */
+        if (i == count) {
+                netdev_dbg(usbdev->net, "%s(): bssid not found (%pM)\n",
+                                        __func__, pmksa->bssid);
+                err = -ENOENT;
+                goto error;
+        }
+
+        for (; i + 1 < count; i++)
+                pmkids->bssid_info[i] = pmkids->bssid_info[i + 1];
+
+        count--;
+        newlen = sizeof(*pmkids) + count * sizeof(pmkids->bssid_info[0]);
+
+        pmkids->length = cpu_to_le32(newlen);
+        pmkids->bssid_info_count = cpu_to_le32(count);
+
+        return pmkids;
+error:
+        kfree(pmkids);
+        return ERR_PTR(err);
+}
+
+static struct ndis_80211_pmkid *update_pmkid(struct usbnet *usbdev,
+                                                struct ndis_80211_pmkid *pmkids,
+                                                struct cfg80211_pmksa *pmksa,
+                                                int max_pmkids)
+{
+        int i, err, len, count, newlen;
+
+        len = le32_to_cpu(pmkids->length);
+        count = le32_to_cpu(pmkids->bssid_info_count);
+
+        if (count > max_pmkids)
+                count = max_pmkids;
+
+        /* update with new pmkid */
+        for (i = 0; i < count; i++) {
+                if (compare_ether_addr(pmkids->bssid_info[i].bssid,
+                                                        pmksa->bssid))
+                        continue;
+
+                memcpy(pmkids->bssid_info[i].pmkid, pmksa->pmkid,
+                                                                WLAN_PMKID_LEN);
+
+                return pmkids;
+        }
+
+        /* out of space, return error */
+        if (i == max_pmkids) {
+                netdev_dbg(usbdev->net, "%s(): out of space\n", __func__);
+                err = -ENOSPC;
+                goto error;
+        }
+
+        /* add new pmkid */
+        newlen = sizeof(*pmkids) + (count + 1) * sizeof(pmkids->bssid_info[0]);
+
+        pmkids = krealloc(pmkids, newlen, GFP_KERNEL);
+        if (!pmkids) {
+                err = -ENOMEM;
+                goto error;
+        }
+
+        pmkids->length = cpu_to_le32(newlen);
+        pmkids->bssid_info_count = cpu_to_le32(count + 1);
+
+        memcpy(pmkids->bssid_info[count].bssid, pmksa->bssid, ETH_ALEN);
+        memcpy(pmkids->bssid_info[count].pmkid, pmksa->pmkid, WLAN_PMKID_LEN);
+
+        return pmkids;
+error:
+        kfree(pmkids);
+        return ERR_PTR(err);
+}
+
 /*
  * cfg80211 ops
  */
@@ -2190,6 +2400,78 @@ static int rndis_dump_station(struct wiphy *wiphy, struct net_device *dev,
         return 0;
 }
 
+static int rndis_set_pmksa(struct wiphy *wiphy, struct net_device *netdev,
+                                struct cfg80211_pmksa *pmksa)
+{
+        struct rndis_wlan_private *priv = wiphy_priv(wiphy);
+        struct usbnet *usbdev = priv->usbdev;
+        struct ndis_80211_pmkid *pmkids;
+        u32 *tmp = (u32 *)pmksa->pmkid;
+
+        netdev_dbg(usbdev->net, "%s(%pM, %08X:%08X:%08X:%08X)\n", __func__,
+                        pmksa->bssid,
+                        cpu_to_be32(tmp[0]), cpu_to_be32(tmp[1]),
+                        cpu_to_be32(tmp[2]), cpu_to_be32(tmp[3]));
+
+        pmkids = get_device_pmkids(usbdev);
+        if (IS_ERR(pmkids)) {
+                /* couldn't read PMKID cache from device */
+                return PTR_ERR(pmkids);
+        }
+
+        pmkids = update_pmkid(usbdev, pmkids, pmksa, wiphy->max_num_pmkids);
+        if (IS_ERR(pmkids)) {
+                /* not found, list full, etc */
+                return PTR_ERR(pmkids);
+        }
+
+        return set_device_pmkids(usbdev, pmkids);
+}
+
+static int rndis_del_pmksa(struct wiphy *wiphy, struct net_device *netdev,
+                                struct cfg80211_pmksa *pmksa)
+{
+        struct rndis_wlan_private *priv = wiphy_priv(wiphy);
+        struct usbnet *usbdev = priv->usbdev;
+        struct ndis_80211_pmkid *pmkids;
+        u32 *tmp = (u32 *)pmksa->pmkid;
+
+        netdev_dbg(usbdev->net, "%s(%pM, %08X:%08X:%08X:%08X)\n", __func__,
+                        pmksa->bssid,
+                        cpu_to_be32(tmp[0]), cpu_to_be32(tmp[1]),
+                        cpu_to_be32(tmp[2]), cpu_to_be32(tmp[3]));
+
+        pmkids = get_device_pmkids(usbdev);
+        if (IS_ERR(pmkids)) {
+                /* Couldn't read PMKID cache from device */
+                return PTR_ERR(pmkids);
+        }
+
+        pmkids = remove_pmkid(usbdev, pmkids, pmksa, wiphy->max_num_pmkids);
+        if (IS_ERR(pmkids)) {
+                /* not found, etc */
+                return PTR_ERR(pmkids);
+        }
+
+        return set_device_pmkids(usbdev, pmkids);
+}
+
+static int rndis_flush_pmksa(struct wiphy *wiphy, struct net_device *netdev)
+{
+        struct rndis_wlan_private *priv = wiphy_priv(wiphy);
+        struct usbnet *usbdev = priv->usbdev;
+        struct ndis_80211_pmkid pmkid;
+
+        netdev_dbg(usbdev->net, "%s()\n", __func__);
+
+        memset(&pmkid, 0, sizeof(pmkid));
+
+        pmkid.length = cpu_to_le32(sizeof(pmkid));
+        pmkid.bssid_info_count = cpu_to_le32(0);
+
+        return rndis_set_oid(usbdev, OID_802_11_PMKID, &pmkid, sizeof(pmkid));
+}
+
 /*
  * workers, indication handlers, device poller
  */