Пример #1
0
static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
				    struct ieee80211_mgmt *mgmt,
				    u8 *prep_elem, u32 metric)
{
	struct mesh_path *mpath;
	u8 *dst_addr, *orig_addr;
	u8 ttl, hopcount, flags;
	u8 next_hop[ETH_ALEN];
	u32 dst_dsn, orig_dsn, lifetime;

	/* Note that we divert from the draft nomenclature and denominate
	 * destination to what the draft refers to as origininator. So in this
	 * function destnation refers to the final destination of the PREP,
	 * which corresponds with the originator of the PREQ which this PREP
	 * replies
	 */
	dst_addr = PREP_IE_DST_ADDR(prep_elem);
	if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0)
		/* destination, no forwarding required */
		return;

	ttl = PREP_IE_TTL(prep_elem);
	if (ttl <= 1) {
		sdata->u.mesh.mshstats.dropped_frames_ttl++;
		return;
	}

	rcu_read_lock();
	mpath = mesh_path_lookup(dst_addr, sdata);
	if (mpath)
		spin_lock_bh(&mpath->state_lock);
	else
		goto fail;
	if (!(mpath->flags & MESH_PATH_ACTIVE)) {
		spin_unlock_bh(&mpath->state_lock);
		goto fail;
	}
	memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN);
	spin_unlock_bh(&mpath->state_lock);
	--ttl;
	flags = PREP_IE_FLAGS(prep_elem);
	lifetime = PREP_IE_LIFETIME(prep_elem);
	hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
	orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
	dst_dsn = PREP_IE_DST_DSN(prep_elem);
	orig_dsn = PREP_IE_ORIG_DSN(prep_elem);

	mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
		cpu_to_le32(orig_dsn), 0, dst_addr,
		cpu_to_le32(dst_dsn), mpath->next_hop->sta.addr, hopcount, ttl,
		cpu_to_le32(lifetime), cpu_to_le32(metric),
		0, sdata);
	rcu_read_unlock();

	sdata->u.mesh.mshstats.fwded_unicast++;
	sdata->u.mesh.mshstats.fwded_frames++;
	return;

fail:
	rcu_read_unlock();
	sdata->u.mesh.mshstats.dropped_frames_no_route++;
	return;
}
Пример #2
0
static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
				    struct ieee80211_mgmt *mgmt,
				    u8 *prep_elem, u32 metric)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct mesh_path *mpath;
	u8 *target_addr, *orig_addr;
	u8 ttl, hopcount, flags;
	u8 next_hop[ETH_ALEN];
	u32 target_sn, orig_sn, lifetime;

	mhwmp_dbg(sdata, "received PREP from %pM\n",
		  PREP_IE_ORIG_ADDR(prep_elem));

	orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
	if (ether_addr_equal(orig_addr, sdata->vif.addr))
		/* destination, no forwarding required */
		return;

	if (!ifmsh->mshcfg.dot11MeshForwarding)
		return;

	ttl = PREP_IE_TTL(prep_elem);
	if (ttl <= 1) {
		sdata->u.mesh.mshstats.dropped_frames_ttl++;
		return;
	}

	rcu_read_lock();
	mpath = mesh_path_lookup(orig_addr, sdata);
	if (mpath)
		spin_lock_bh(&mpath->state_lock);
	else
		goto fail;
	if (!(mpath->flags & MESH_PATH_ACTIVE)) {
		spin_unlock_bh(&mpath->state_lock);
		goto fail;
	}
	memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
	spin_unlock_bh(&mpath->state_lock);
	--ttl;
	flags = PREP_IE_FLAGS(prep_elem);
	lifetime = PREP_IE_LIFETIME(prep_elem);
	hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
	target_addr = PREP_IE_TARGET_ADDR(prep_elem);
	target_sn = PREP_IE_TARGET_SN(prep_elem);
	orig_sn = PREP_IE_ORIG_SN(prep_elem);

	mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
		cpu_to_le32(orig_sn), 0, target_addr,
		cpu_to_le32(target_sn), next_hop, hopcount,
		ttl, cpu_to_le32(lifetime), cpu_to_le32(metric),
		0, sdata);
	rcu_read_unlock();

	sdata->u.mesh.mshstats.fwded_unicast++;
	sdata->u.mesh.mshstats.fwded_frames++;
	return;

fail:
	rcu_read_unlock();
	sdata->u.mesh.mshstats.dropped_frames_no_route++;
}