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mac80211: implement the proactive PREP generation

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Generate the proactive PREP element in Proactive PREQ mode as
defined in Sec. 13.10.10.3 (Case D) of IEEE Std. 802.11-2012.

Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Chun-Yeow Yeoh 2012-06-17 02:27:40 +08:00 committed by Johannes Berg
parent a69cc44fe9
commit 3fbf4b71be
1 changed files with 33 additions and 5 deletions
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38
net/mac80211/mesh_hwmp.c
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@ -516,10 +516,11 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
struct mesh_path *mpath = NULL;
u8 *target_addr, *orig_addr;
const u8 *da;
u8 target_flags, ttl;
u32 orig_sn, target_sn, lifetime;
u8 target_flags, ttl, flags;
u32 orig_sn, target_sn, lifetime, orig_metric;
bool reply = false;
bool forward = true;
bool root_is_gate;
/* Update target SN, if present */
target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
@ -527,6 +528,10 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
target_sn = PREQ_IE_TARGET_SN(preq_elem);
orig_sn = PREQ_IE_ORIG_SN(preq_elem);
target_flags = PREQ_IE_TARGET_F(preq_elem);
orig_metric = metric;
/* Proactive PREQ gate announcements */
flags = PREQ_IE_FLAGS(preq_elem);
root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
mhwmp_dbg("received PREQ from %pM", orig_addr);
@ -541,6 +546,22 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
target_sn = ++ifmsh->sn;
ifmsh->last_sn_update = jiffies;
}
} else if (is_broadcast_ether_addr(target_addr) &&
(target_flags & IEEE80211_PREQ_TO_FLAG)) {
rcu_read_lock();
mpath = mesh_path_lookup(orig_addr, sdata);
if (mpath) {
if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
reply = true;
target_addr = sdata->vif.addr;
target_sn = ++ifmsh->sn;
metric = 0;
ifmsh->last_sn_update = jiffies;
}
if (root_is_gate)
mesh_path_add_gate(mpath);
}
rcu_read_unlock();
} else {
rcu_read_lock();
mpath = mesh_path_lookup(target_addr, sdata);
@ -573,13 +594,14 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
cpu_to_le32(target_sn), mgmt->sa, 0, ttl,
cpu_to_le32(lifetime), cpu_to_le32(metric),
0, sdata);
} else
} else {
ifmsh->mshstats.dropped_frames_ttl++;
}
}
if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
u32 preq_id;
u8 hopcount, flags;
u8 hopcount;
ttl = PREQ_IE_TTL(preq_elem);
lifetime = PREQ_IE_LIFETIME(preq_elem);
@ -589,11 +611,17 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
}
mhwmp_dbg("forwarding the PREQ from %pM", orig_addr);
--ttl;
flags = PREQ_IE_FLAGS(preq_elem);
preq_id = PREQ_IE_PREQ_ID(preq_elem);
hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
da = (mpath && mpath->is_root) ?
mpath->rann_snd_addr : broadcast_addr;
if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
target_sn = PREQ_IE_TARGET_SN(preq_elem);
metric = orig_metric;
}
mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
cpu_to_le32(orig_sn), target_flags, target_addr,
cpu_to_le32(target_sn), da,