cfg80211/nl80211: Add PMKSA caching candidate event

When the driver (or most likely firmware) decides which AP to use
for roaming based on internal scan result processing, user space
needs to be notified of PMKSA caching candidates to allow RSN
pre-authentication to be used.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 61 insertions, 0 deletions

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 832f6574e4ed..61adea540e02 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -1095,3 +1095,14 @@ void cfg80211_gtk_rekey_notify(struct net_device *dev, const u8 *bssid,
         nl80211_gtk_rekey_notify(rdev, dev, bssid, replay_ctr, gfp);
 }
 EXPORT_SYMBOL(cfg80211_gtk_rekey_notify);
+
+void cfg80211_pmksa_candidate_notify(struct net_device *dev, int index,
+                                     const u8 *bssid, bool preauth, gfp_t gfp)
+{
+        struct wireless_dev *wdev = dev->ieee80211_ptr;
+        struct wiphy *wiphy = wdev->wiphy;
+        struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+
+        nl80211_pmksa_candidate_notify(rdev, dev, index, bssid, preauth, gfp);
+}
+EXPORT_SYMBOL(cfg80211_pmksa_candidate_notify);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 430b432bc3f0..3c6427abdf34 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -7270,6 +7270,52 @@ void nl80211_gtk_rekey_notify(struct cfg80211_registered_device *rdev,
         nlmsg_free(msg);
 }
 
+void nl80211_pmksa_candidate_notify(struct cfg80211_registered_device *rdev,
+                                    struct net_device *netdev, int index,
+                                    const u8 *bssid, bool preauth, gfp_t gfp)
+{
+        struct sk_buff *msg;
+        struct nlattr *attr;
+        void *hdr;
+
+        msg = nlmsg_new(NLMSG_GOODSIZE, gfp);
+        if (!msg)
+                return;
+
+        hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_PMKSA_CANDIDATE);
+        if (!hdr) {
+                nlmsg_free(msg);
+                return;
+        }
+
+        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
+        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
+
+        attr = nla_nest_start(msg, NL80211_ATTR_PMKSA_CANDIDATE);
+        if (!attr)
+                goto nla_put_failure;
+
+        NLA_PUT_U32(msg, NL80211_PMKSA_CANDIDATE_INDEX, index);
+        NLA_PUT(msg, NL80211_PMKSA_CANDIDATE_BSSID, ETH_ALEN, bssid);
+        if (preauth)
+                NLA_PUT_FLAG(msg, NL80211_PMKSA_CANDIDATE_PREAUTH);
+
+        nla_nest_end(msg, attr);
+
+        if (genlmsg_end(msg, hdr) < 0) {
+                nlmsg_free(msg);
+                return;
+        }
+
+        genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), msg, 0,
+                                nl80211_mlme_mcgrp.id, gfp);
+        return;
+
+ nla_put_failure:
+        genlmsg_cancel(msg, hdr);
+        nlmsg_free(msg);
+}
+
 void
 nl80211_send_cqm_pktloss_notify(struct cfg80211_registered_device *rdev,
                                 struct net_device *netdev, const u8 *peer,
diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
index 5d69c56400ae..f24a1fbeaf19 100644
--- a/net/wireless/nl80211.h
+++ b/net/wireless/nl80211.h
@@ -113,4 +113,8 @@ void nl80211_gtk_rekey_notify(struct cfg80211_registered_device *rdev,
                               struct net_device *netdev, const u8 *bssid,
                               const u8 *replay_ctr, gfp_t gfp);
 
+void nl80211_pmksa_candidate_notify(struct cfg80211_registered_device *rdev,
+                                    struct net_device *netdev, int index,
+                                    const u8 *bssid, bool preauth, gfp_t gfp);
+
 #endif /* __NET_WIRELESS_NL80211_H */