diff options
author | Johannes Berg <johannes@sipsolutions.net> | 2008-09-08 15:44:26 (GMT) |
---|---|---|
committer | John W. Linville <linville@tuxdriver.com> | 2008-09-11 19:53:37 (GMT) |
commit | 98c8fccfaea838e62ffde2f2e44568844e0e5472 (patch) | |
tree | c69552d4be03dd8321b6f90b3fbb17c607fa9940 /net/mac80211/scan.c | |
parent | 0a51b27e956bd9580296c48191b78175ed8b5971 (diff) | |
download | linux-fsl-qoriq-98c8fccfaea838e62ffde2f2e44568844e0e5472.tar.xz |
mac80211: refactor and move scan RX code
This patch refactors some code and moves the scan RX function
to scan.c. More importantly, however, it changes it so that the
MLME's beacon/probe_resp functions aren't invoked when scanning
so that we can remove a "if (scanning)" conditions from two
places.
There's a very slight behavioural change in this patch: now,
when scanning, IBSS and mesh aren't updated even on the same
channel.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/scan.c')
-rw-r--r-- | net/mac80211/scan.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index 68fa782..2848ba3 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -23,6 +23,74 @@ #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5) +ieee80211_rx_result +ieee80211_sta_rx_scan(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, + struct ieee80211_rx_status *rx_status) +{ + struct ieee80211_mgmt *mgmt; + struct ieee80211_sta_bss *bss; + u8 *elements; + struct ieee80211_channel *channel; + size_t baselen; + int freq; + __le16 fc; + bool presp, beacon = false; + struct ieee802_11_elems elems; + + if (skb->len < 2) + return RX_DROP_UNUSABLE; + + mgmt = (struct ieee80211_mgmt *) skb->data; + fc = mgmt->frame_control; + + if (ieee80211_is_ctl(fc)) + return RX_CONTINUE; + + if (skb->len < 24) + return RX_DROP_MONITOR; + + presp = ieee80211_is_probe_resp(fc); + if (presp) { + /* ignore ProbeResp to foreign address */ + if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) + return RX_DROP_MONITOR; + + presp = true; + elements = mgmt->u.probe_resp.variable; + baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); + } else { + beacon = ieee80211_is_beacon(fc); + baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); + elements = mgmt->u.beacon.variable; + } + + if (!presp && !beacon) + return RX_CONTINUE; + + if (baselen > skb->len) + return RX_DROP_MONITOR; + + ieee802_11_parse_elems(elements, skb->len - baselen, &elems); + + if (elems.ds_params && elems.ds_params_len == 1) + freq = ieee80211_channel_to_frequency(elems.ds_params[0]); + else + freq = rx_status->freq; + + channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); + + if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) + return RX_DROP_MONITOR; + + bss = ieee80211_bss_info_update(sdata->local, rx_status, + mgmt, skb->len, &elems, + freq, beacon); + ieee80211_rx_bss_put(sdata->local, bss); + + dev_kfree_skb(skb); + return RX_QUEUED; +} + static void ieee80211_send_nullfunc(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata, int powersave) |