cfg80211: Userspace may inform kernel of mesh auth method.

Authentication takes place in userspace, but the beacon is
generated in the kernel.  Allow userspace to inform the
kernel of the authentication method so the appropriate
mesh config IE can be set prior to beacon generation when
joining the MBSS.

Signed-off-by: Colleen Twitty <colleen@cozybit.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

4 files changed, 16 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 26e91138a2c6..32a2f1b20861 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1161,6 +1161,7 @@ struct mesh_config {
  * @sync_method: which synchronization method to use
  * @path_sel_proto: which path selection protocol to use
  * @path_metric: which metric to use
+ * @auth_id: which authentication method this mesh is using
  * @ie: vendor information elements (optional)
  * @ie_len: length of vendor information elements
  * @is_authenticated: this mesh requires authentication
@@ -1179,6 +1180,7 @@ struct mesh_setup {
         u8 sync_method;
         u8 path_sel_proto;
         u8 path_metric;
+        u8 auth_id;
         const u8 *ie;
         u8 ie_len;
         bool is_authenticated;
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index b48430769eda..06320713e9c9 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2645,6 +2645,10 @@ enum nl80211_meshconf_params {
  * @NL80211_MESH_SETUP_USERSPACE_MPM: Enable this option if userspace will
  *      implement an MPM which handles peer allocation and state.
  *
+ * @NL80211_MESH_SETUP_AUTH_PROTOCOL: Inform the kernel of the authentication
+ *      method (u8, as defined in IEEE 8.4.2.100.6, e.g. 0x1 for SAE).
+ *      Default is no authentication method required.
+ *
  * @NL80211_MESH_SETUP_ATTR_MAX: highest possible mesh setup attribute number
  *
  * @__NL80211_MESH_SETUP_ATTR_AFTER_LAST: Internal use
@@ -2658,6 +2662,7 @@ enum nl80211_mesh_setup_params {
         NL80211_MESH_SETUP_USERSPACE_AMPE,
         NL80211_MESH_SETUP_ENABLE_VENDOR_SYNC,
         NL80211_MESH_SETUP_USERSPACE_MPM,
+        NL80211_MESH_SETUP_AUTH_PROTOCOL,
 
         /* keep last */
         __NL80211_MESH_SETUP_ATTR_AFTER_LAST,
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index 0bb93f3061a4..9546ad210550 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -82,6 +82,7 @@ const struct mesh_setup default_mesh_setup = {
         .sync_method = IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET,
         .path_sel_proto = IEEE80211_PATH_PROTOCOL_HWMP,
         .path_metric = IEEE80211_PATH_METRIC_AIRTIME,
+        .auth_id = 0, /* open */
         .ie = NULL,
         .ie_len = 0,
         .is_secure = false,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 9cdcd9ec3317..5f10f7acfa06 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4672,6 +4672,7 @@ static const struct nla_policy
         [NL80211_MESH_SETUP_ENABLE_VENDOR_PATH_SEL] = { .type = NLA_U8 },
         [NL80211_MESH_SETUP_ENABLE_VENDOR_METRIC] = { .type = NLA_U8 },
         [NL80211_MESH_SETUP_USERSPACE_AUTH] = { .type = NLA_FLAG },
+        [NL80211_MESH_SETUP_AUTH_PROTOCOL] = { .type = NLA_U8 },
         [NL80211_MESH_SETUP_USERSPACE_MPM] = { .type = NLA_FLAG },
         [NL80211_MESH_SETUP_IE] = { .type = NLA_BINARY,
                                     .len = IEEE80211_MAX_DATA_LEN },
@@ -4857,6 +4858,13 @@ static int nl80211_parse_mesh_setup(struct genl_info *info,
         if (setup->is_secure)
                 setup->user_mpm = true;
 
+        if (tb[NL80211_MESH_SETUP_AUTH_PROTOCOL]) {
+                if (!setup->user_mpm)
+                        return -EINVAL;
+                setup->auth_id =
+                        nla_get_u8(tb[NL80211_MESH_SETUP_AUTH_PROTOCOL]);
+        }
+
         return 0;
 }