nl80211: bounce scan request back to userspace

When a scan finishes only the program that asked for it
knows what kind of scan it was; let's tell everybody else
about the scan parameters as well so they can evaluate
the result of the scan better. Also helps with debugging.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 19dc796..909ebd6 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3563,11 +3563,43 @@ void nl80211_notify_dev_rename(struct cfg80211_registered_device *rdev)
        genlmsg_multicast(msg, 0, nl80211_config_mcgrp.id, GFP_KERNEL);
 }
 
+static int nl80211_add_scan_req(struct sk_buff *msg,
+                               struct cfg80211_registered_device *rdev)
+{
+       struct cfg80211_scan_request *req = rdev->scan_req;
+       struct nlattr *nest;
+       int i;
+
+       if (WARN_ON(!req))
+               return 0;
+
+       nest = nla_nest_start(msg, NL80211_ATTR_SCAN_SSIDS);
+       if (!nest)
+               goto nla_put_failure;
+       for (i = 0; i < req->n_ssids; i++)
+               NLA_PUT(msg, i, req->ssids[i].ssid_len, req->ssids[i].ssid);
+       nla_nest_end(msg, nest);
+
+       nest = nla_nest_start(msg, NL80211_ATTR_SCAN_FREQUENCIES);
+       if (!nest)
+               goto nla_put_failure;
+       for (i = 0; i < req->n_channels; i++)
+               NLA_PUT_U32(msg, i, req->channels[i]->center_freq);
+       nla_nest_end(msg, nest);
+
+       if (req->ie)
+               NLA_PUT(msg, NL80211_ATTR_IE, req->ie_len, req->ie);
+
+       return 0;
+ nla_put_failure:
+       return -ENOBUFS;
+}
+
 static int nl80211_send_scan_donemsg(struct sk_buff *msg,
-                                   struct cfg80211_registered_device *rdev,
-                                   struct net_device *netdev,
-                                   u32 pid, u32 seq, int flags,
-                                   u32 cmd)
+                                    struct cfg80211_registered_device *rdev,
+                                    struct net_device *netdev,
+                                    u32 pid, u32 seq, int flags,
+                                    u32 cmd)
 {
        void *hdr;
 
@@ -3578,7 +3610,8 @@ static int nl80211_send_scan_donemsg(struct sk_buff *msg,
        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
 
-       /* XXX: we should probably bounce back the request? */
+       /* ignore errors and send incomplete event anyway */
+       nl80211_add_scan_req(msg, rdev);
 
        return genlmsg_end(msg, hdr);
 

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index df59440..e95b638 100644 (file)
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -29,13 +29,14 @@ void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
                goto out;
 
        WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
-       wiphy_to_dev(request->wiphy)->scan_req = NULL;
 
        if (aborted)
                nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
        else
                nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
 
+       wiphy_to_dev(request->wiphy)->scan_req = NULL;
+
 #ifdef CONFIG_WIRELESS_EXT
        if (!aborted) {
                memset(&wrqu, 0, sizeof(wrqu));