Return-path: Received: from mail-da0-f43.google.com ([209.85.210.43]:64051 "EHLO mail-da0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934004Ab3BMUPg (ORCPT ); Wed, 13 Feb 2013 15:15:36 -0500 Received: by mail-da0-f43.google.com with SMTP id u36so708235dak.2 for ; Wed, 13 Feb 2013 12:15:35 -0800 (PST) From: Thomas Pedersen To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, devel@lists.open80211s.org, Thomas Pedersen Subject: [PATCH v2 3/3] mac80211: generate mesh probe responses Date: Wed, 13 Feb 2013 12:14:21 -0800 Message-Id: <1360786461-30107-3-git-send-email-thomas@cozybit.com> (sfid-20130213_211543_942233_BA760A3C) In-Reply-To: <1360786461-30107-1-git-send-email-thomas@cozybit.com> References: <1360786461-30107-1-git-send-email-thomas@cozybit.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: Mesh interfaces will now respond to any broadcast (or matching directed mesh) probe requests with a probe response. Signed-off-by: Thomas Pedersen --- v2: less verbose (Johannes) net/mac80211/mesh.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++ net/mac80211/rx.c | 5 +++-- 2 files changed, 64 insertions(+), 2 deletions(-) diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c index d9426e0..aecbf67 100644 --- a/net/mac80211/mesh.c +++ b/net/mac80211/mesh.c @@ -862,6 +862,64 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) sdata->u.mesh.timers_running = 0; } +static void +ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata, + struct ieee80211_mgmt *mgmt, size_t len) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; + struct sk_buff *presp; + struct beacon_data *bcn; + struct ieee80211_mgmt *hdr; + struct ieee802_11_elems elems; + size_t baselen; + u8 *pos, *end; + + end = ((u8 *) mgmt) + len; + pos = mgmt->u.probe_req.variable; + baselen = (u8 *) pos - (u8 *) mgmt; + if (baselen > len) + return; + + ieee802_11_parse_elems(pos, len - baselen, &elems); + + /* 802.11-2012 10.1.4.3.2 */ + if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) && + !is_broadcast_ether_addr(mgmt->da)) || + elems.ssid_len != 0) + return; + + if (elems.mesh_id_len != 0 && + (elems.mesh_id_len != ifmsh->mesh_id_len || + memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len))) + return; + + rcu_read_lock(); + bcn = rcu_dereference(ifmsh->beacon); + + if (!bcn) + goto out; + + presp = dev_alloc_skb(local->tx_headroom + + bcn->head_len + bcn->tail_len); + if (!presp) + goto out; + + skb_reserve(presp, local->tx_headroom); + memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len); + memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len); + hdr = (struct ieee80211_mgmt *) presp->data; + hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | + IEEE80211_STYPE_PROBE_RESP); + memcpy(hdr->da, mgmt->sa, ETH_ALEN); + mpl_dbg(sdata, "sending probe resp. to %pM\n", hdr->da); + IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; + ieee80211_tx_skb(sdata, presp); +out: + rcu_read_unlock(); + return; +} + static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata, u16 stype, struct ieee80211_mgmt *mgmt, @@ -951,6 +1009,9 @@ void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len, rx_status); break; + case IEEE80211_STYPE_PROBE_REQ: + ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len); + break; case IEEE80211_STYPE_ACTION: ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status); break; diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index b5f1bba..34aa975 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2692,8 +2692,9 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) return RX_DROP_MONITOR; break; case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): - /* process only for ibss */ - if (sdata->vif.type != NL80211_IFTYPE_ADHOC) + /* process only for ibss and mesh */ + if (sdata->vif.type != NL80211_IFTYPE_ADHOC && + sdata->vif.type != NL80211_IFTYPE_MESH_POINT) return RX_DROP_MONITOR; break; default: -- 1.7.10.4