cfg80211/mac80211: allow management TX to not wait for ACK

For probe responses it can be useful to not wait for ACK to
avoid retransmissions if the station that sent the probe is
already on the next channel, so allow userspace to request
not caring about the ACK with a new nl80211 flag.

Since mac80211 needs to be updated for the new function
prototype anyway implement it right away -- it's just a
few lines of code.

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

3 files changed, 28 insertions, 18 deletions

diff --git a/net/wireless/core.h b/net/wireless/core.h
index 4c6ff402435..1c7d4df5418 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -378,7 +378,7 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
                           enum nl80211_channel_type channel_type,
                           bool channel_type_valid, unsigned int wait,
                           const u8 *buf, size_t len, bool no_cck,
-                          u64 *cookie);
+                          bool dont_wait_for_ack, u64 *cookie);
 
 /* SME */
 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 34891e08c54..6c1bafd508c 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -904,7 +904,7 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
                           enum nl80211_channel_type channel_type,
                           bool channel_type_valid, unsigned int wait,
                           const u8 *buf, size_t len, bool no_cck,
-                          u64 *cookie)
+                          bool dont_wait_for_ack, u64 *cookie)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         const struct ieee80211_mgmt *mgmt;
@@ -995,7 +995,8 @@ int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
         /* Transmit the Action frame as requested by user space */
         return rdev->ops->mgmt_tx(&rdev->wiphy, dev, chan, offchan,
                                   channel_type, channel_type_valid,
-                                  wait, buf, len, no_cck, cookie);
+                                  wait, buf, len, no_cck, dont_wait_for_ack,
+                                  cookie);
 }
 
 bool cfg80211_rx_mgmt(struct net_device *dev, int freq, const u8 *buf,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 5b659068b02..0ef09415c89 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -196,6 +196,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
         [NL80211_ATTR_TDLS_OPERATION] = { .type = NLA_U8 },
         [NL80211_ATTR_TDLS_SUPPORT] = { .type = NLA_FLAG },
         [NL80211_ATTR_TDLS_EXTERNAL_SETUP] = { .type = NLA_FLAG },
+        [NL80211_ATTR_DONT_WAIT_FOR_ACK] = { .type = NLA_FLAG },
 };
 
 /* policy for the key attributes */
@@ -5282,10 +5283,11 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
         int err;
         void *hdr;
         u64 cookie;
-        struct sk_buff *msg;
+        struct sk_buff *msg = NULL;
         unsigned int wait = 0;
-        bool offchan;
-        bool no_cck;
+        bool offchan, no_cck, dont_wait_for_ack;
+
+        dont_wait_for_ack = info->attrs[NL80211_ATTR_DONT_WAIT_FOR_ACK];
 
         if (!info->attrs[NL80211_ATTR_FRAME] ||
             !info->attrs[NL80211_ATTR_WIPHY_FREQ])
@@ -5329,29 +5331,36 @@ static int nl80211_tx_mgmt(struct sk_buff *skb, struct genl_info *info)
         if (chan == NULL)
                 return -EINVAL;
 
-        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
-        if (!msg)
-                return -ENOMEM;
+        if (!dont_wait_for_ack) {
+                msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+                if (!msg)
+                        return -ENOMEM;
 
-        hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
-                             NL80211_CMD_FRAME);
+                hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
+                                     NL80211_CMD_FRAME);
 
-        if (IS_ERR(hdr)) {
-                err = PTR_ERR(hdr);
-                goto free_msg;
+                if (IS_ERR(hdr)) {
+                        err = PTR_ERR(hdr);
+                        goto free_msg;
+                }
         }
+
         err = cfg80211_mlme_mgmt_tx(rdev, dev, chan, offchan, channel_type,
                                     channel_type_valid, wait,
                                     nla_data(info->attrs[NL80211_ATTR_FRAME]),
                                     nla_len(info->attrs[NL80211_ATTR_FRAME]),
-                                    no_cck, &cookie);
+                                    no_cck, dont_wait_for_ack, &cookie);
         if (err)
                 goto free_msg;
 
-        NLA_PUT_U64(msg, NL80211_ATTR_COOKIE, cookie);
+        if (msg) {
+                NLA_PUT_U64(msg, NL80211_ATTR_COOKIE, cookie);
 
-        genlmsg_end(msg, hdr);
-        return genlmsg_reply(msg, info);
+                genlmsg_end(msg, hdr);
+                return genlmsg_reply(msg, info);
+        }
+
+        return 0;
 
  nla_put_failure:
         err = -ENOBUFS;