/** * mesh_path_start_discovery - launch a path discovery from the PREQ queue * * @sdata: local mesh subif */ void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct mesh_preq_queue *preq_node; struct mesh_path *mpath; u8 ttl, dst_flags; u32 lifetime; spin_lock_bh(&ifmsh->mesh_preq_queue_lock); if (!ifmsh->preq_queue_len || time_before(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) { spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); return; } preq_node = list_first_entry(&ifmsh->preq_queue.list, struct mesh_preq_queue, list); list_del(&preq_node->list); --ifmsh->preq_queue_len; spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); rcu_read_lock(); mpath = mesh_path_lookup(preq_node->dst, sdata); if (!mpath) goto enddiscovery; spin_lock_bh(&mpath->state_lock); if (preq_node->flags & PREQ_Q_F_START) { if (mpath->flags & MESH_PATH_RESOLVING) { spin_unlock_bh(&mpath->state_lock); goto enddiscovery; } else { mpath->flags &= ~MESH_PATH_RESOLVED; mpath->flags |= MESH_PATH_RESOLVING; mpath->discovery_retries = 0; mpath->discovery_timeout = disc_timeout_jiff(sdata); } } else if (!(mpath->flags & MESH_PATH_RESOLVING) || mpath->flags & MESH_PATH_RESOLVED) { mpath->flags &= ~MESH_PATH_RESOLVING; spin_unlock_bh(&mpath->state_lock); goto enddiscovery; } ifmsh->last_preq = jiffies; if (time_after(jiffies, ifmsh->last_dsn_update + net_traversal_jiffies(sdata)) || time_before(jiffies, ifmsh->last_dsn_update)) { ++ifmsh->dsn; sdata->u.mesh.last_dsn_update = jiffies; } lifetime = default_lifetime(sdata); ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; if (ttl == 0) { sdata->u.mesh.mshstats.dropped_frames_ttl++; spin_unlock_bh(&mpath->state_lock); goto enddiscovery; } if (preq_node->flags & PREQ_Q_F_REFRESH) dst_flags = MP_F_DO; else dst_flags = MP_F_RF; spin_unlock_bh(&mpath->state_lock); mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr, cpu_to_le32(ifmsh->dsn), dst_flags, mpath->dst, cpu_to_le32(mpath->dsn), sdata->dev->broadcast, 0, ttl, cpu_to_le32(lifetime), 0, cpu_to_le32(ifmsh->preq_id++), sdata); mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); enddiscovery: rcu_read_unlock(); kfree(preq_node); }
static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, u8 *preq_elem, u32 metric) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct mesh_path *mpath; u8 *dst_addr, *orig_addr; u8 dst_flags, ttl; u32 orig_dsn, dst_dsn, lifetime; bool reply = false; bool forward = true; /* Update destination DSN, if present */ dst_addr = PREQ_IE_DST_ADDR(preq_elem); orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); dst_dsn = PREQ_IE_DST_DSN(preq_elem); orig_dsn = PREQ_IE_ORIG_DSN(preq_elem); dst_flags = PREQ_IE_DST_F(preq_elem); if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { forward = false; reply = true; metric = 0; if (time_after(jiffies, ifmsh->last_dsn_update + net_traversal_jiffies(sdata)) || time_before(jiffies, ifmsh->last_dsn_update)) { dst_dsn = ++ifmsh->dsn; ifmsh->last_dsn_update = jiffies; } } else { rcu_read_lock(); mpath = mesh_path_lookup(dst_addr, sdata); if (mpath) { if ((!(mpath->flags & MESH_PATH_DSN_VALID)) || DSN_LT(mpath->dsn, dst_dsn)) { mpath->dsn = dst_dsn; mpath->flags |= MESH_PATH_DSN_VALID; } else if ((!(dst_flags & MP_F_DO)) && (mpath->flags & MESH_PATH_ACTIVE)) { reply = true; metric = mpath->metric; dst_dsn = mpath->dsn; if (dst_flags & MP_F_RF) dst_flags |= MP_F_DO; else forward = false; } } rcu_read_unlock(); } if (reply) { lifetime = PREQ_IE_LIFETIME(preq_elem); ttl = ifmsh->mshcfg.dot11MeshTTL; if (ttl != 0) mesh_path_sel_frame_tx(MPATH_PREP, 0, dst_addr, cpu_to_le32(dst_dsn), 0, orig_addr, cpu_to_le32(orig_dsn), mgmt->sa, 0, ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), 0, sdata); else ifmsh->mshstats.dropped_frames_ttl++; } if (forward) { u32 preq_id; u8 hopcount, flags; ttl = PREQ_IE_TTL(preq_elem); lifetime = PREQ_IE_LIFETIME(preq_elem); if (ttl <= 1) { ifmsh->mshstats.dropped_frames_ttl++; return; } --ttl; flags = PREQ_IE_FLAGS(preq_elem); preq_id = PREQ_IE_PREQ_ID(preq_elem); hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, cpu_to_le32(orig_dsn), dst_flags, dst_addr, cpu_to_le32(dst_dsn), sdata->dev->broadcast, hopcount, ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), cpu_to_le32(preq_id), sdata); ifmsh->mshstats.fwded_mcast++; ifmsh->mshstats.fwded_frames++; } }
static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, u8 *preq_elem, u32 metric) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct mesh_path *mpath; u8 *target_addr, *orig_addr; u8 target_flags, ttl; u32 orig_sn, target_sn, lifetime; bool reply = false; bool forward = true; /* Update target SN, if present */ target_addr = PREQ_IE_TARGET_ADDR(preq_elem); orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); target_sn = PREQ_IE_TARGET_SN(preq_elem); orig_sn = PREQ_IE_ORIG_SN(preq_elem); target_flags = PREQ_IE_TARGET_F(preq_elem); mhwmp_dbg("received PREQ from %pM\n", orig_addr); if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) { mhwmp_dbg("PREQ is for us\n"); forward = false; reply = true; metric = 0; if (time_after(jiffies, ifmsh->last_sn_update + net_traversal_jiffies(sdata)) || time_before(jiffies, ifmsh->last_sn_update)) { target_sn = ++ifmsh->sn; ifmsh->last_sn_update = jiffies; } } else { rcu_read_lock(); mpath = mesh_path_lookup(target_addr, sdata); if (mpath) { if ((!(mpath->flags & MESH_PATH_SN_VALID)) || SN_LT(mpath->sn, target_sn)) { mpath->sn = target_sn; mpath->flags |= MESH_PATH_SN_VALID; } else if ((!(target_flags & MP_F_DO)) && (mpath->flags & MESH_PATH_ACTIVE)) { reply = true; metric = mpath->metric; target_sn = mpath->sn; if (target_flags & MP_F_RF) target_flags |= MP_F_DO; else forward = false; } } rcu_read_unlock(); } if (reply) { lifetime = PREQ_IE_LIFETIME(preq_elem); ttl = ifmsh->mshcfg.element_ttl; if (ttl != 0) { mhwmp_dbg("replying to the PREQ\n"); mesh_path_sel_frame_tx(MPATH_PREP, 0, target_addr, cpu_to_le32(target_sn), 0, orig_addr, cpu_to_le32(orig_sn), mgmt->sa, 0, ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), 0, sdata); } else ifmsh->mshstats.dropped_frames_ttl++; } if (forward) { u32 preq_id; u8 hopcount, flags; ttl = PREQ_IE_TTL(preq_elem); lifetime = PREQ_IE_LIFETIME(preq_elem); if (ttl <= 1) { ifmsh->mshstats.dropped_frames_ttl++; return; } mhwmp_dbg("forwarding the PREQ from %pM\n", orig_addr); --ttl; flags = PREQ_IE_FLAGS(preq_elem); preq_id = PREQ_IE_PREQ_ID(preq_elem); hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, cpu_to_le32(orig_sn), target_flags, target_addr, cpu_to_le32(target_sn), broadcast_addr, hopcount, ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), cpu_to_le32(preq_id), sdata); ifmsh->mshstats.fwded_mcast++; ifmsh->mshstats.fwded_frames++; } }
static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, u8 *preq_elem, u32 metric) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct mesh_path *mpath = NULL; u8 *target_addr, *orig_addr; const u8 *da; 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); orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); 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(sdata, "received PREQ from %pM\n", orig_addr); if (ether_addr_equal(target_addr, sdata->vif.addr)) { mhwmp_dbg(sdata, "PREQ is for us\n"); forward = false; reply = true; metric = 0; if (time_after(jiffies, ifmsh->last_sn_update + net_traversal_jiffies(sdata)) || time_before(jiffies, ifmsh->last_sn_update)) { 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); if (mpath) { if ((!(mpath->flags & MESH_PATH_SN_VALID)) || SN_LT(mpath->sn, target_sn)) { mpath->sn = target_sn; mpath->flags |= MESH_PATH_SN_VALID; } else if ((!(target_flags & MP_F_DO)) && (mpath->flags & MESH_PATH_ACTIVE)) { reply = true; metric = mpath->metric; target_sn = mpath->sn; if (target_flags & MP_F_RF) target_flags |= MP_F_DO; else forward = false; } } rcu_read_unlock(); } if (reply) { lifetime = PREQ_IE_LIFETIME(preq_elem); ttl = ifmsh->mshcfg.element_ttl; if (ttl != 0) { mhwmp_dbg(sdata, "replying to the PREQ\n"); mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, cpu_to_le32(orig_sn), 0, target_addr, cpu_to_le32(target_sn), mgmt->sa, 0, ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), 0, sdata); } else { ifmsh->mshstats.dropped_frames_ttl++; } } if (forward && ifmsh->mshcfg.dot11MeshForwarding) { u32 preq_id; u8 hopcount; ttl = PREQ_IE_TTL(preq_elem); lifetime = PREQ_IE_LIFETIME(preq_elem); if (ttl <= 1) { ifmsh->mshstats.dropped_frames_ttl++; return; } mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); --ttl; 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, hopcount, ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), cpu_to_le32(preq_id), sdata); if (!is_multicast_ether_addr(da)) ifmsh->mshstats.fwded_unicast++; else ifmsh->mshstats.fwded_mcast++; ifmsh->mshstats.fwded_frames++; } }
/** * mesh_path_start_discovery - launch a path discovery from the PREQ queue * * @sdata: local mesh subif */ void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct mesh_preq_queue *preq_node; struct mesh_path *mpath; u8 ttl, target_flags = 0; const u8 *da; u32 lifetime; spin_lock_bh(&ifmsh->mesh_preq_queue_lock); if (!ifmsh->preq_queue_len || time_before(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) { spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); return; } preq_node = list_first_entry(&ifmsh->preq_queue.list, struct mesh_preq_queue, list); list_del(&preq_node->list); --ifmsh->preq_queue_len; spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); rcu_read_lock(); mpath = mesh_path_lookup(sdata, preq_node->dst); if (!mpath) goto enddiscovery; spin_lock_bh(&mpath->state_lock); if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) { spin_unlock_bh(&mpath->state_lock); goto enddiscovery; } mpath->flags &= ~MESH_PATH_REQ_QUEUED; if (preq_node->flags & PREQ_Q_F_START) { if (mpath->flags & MESH_PATH_RESOLVING) { spin_unlock_bh(&mpath->state_lock); goto enddiscovery; } else { mpath->flags &= ~MESH_PATH_RESOLVED; mpath->flags |= MESH_PATH_RESOLVING; mpath->discovery_retries = 0; mpath->discovery_timeout = disc_timeout_jiff(sdata); } } else if (!(mpath->flags & MESH_PATH_RESOLVING) || mpath->flags & MESH_PATH_RESOLVED) { mpath->flags &= ~MESH_PATH_RESOLVING; spin_unlock_bh(&mpath->state_lock); goto enddiscovery; } ifmsh->last_preq = jiffies; if (time_after(jiffies, ifmsh->last_sn_update + net_traversal_jiffies(sdata)) || time_before(jiffies, ifmsh->last_sn_update)) { ++ifmsh->sn; sdata->u.mesh.last_sn_update = jiffies; } lifetime = default_lifetime(sdata); ttl = sdata->u.mesh.mshcfg.element_ttl; if (ttl == 0) { sdata->u.mesh.mshstats.dropped_frames_ttl++; spin_unlock_bh(&mpath->state_lock); goto enddiscovery; } if (preq_node->flags & PREQ_Q_F_REFRESH) target_flags |= IEEE80211_PREQ_TO_FLAG; else target_flags &= ~IEEE80211_PREQ_TO_FLAG; spin_unlock_bh(&mpath->state_lock); da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, target_flags, mpath->dst, mpath->sn, da, 0, ttl, lifetime, 0, ifmsh->preq_id++, sdata); mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); enddiscovery: rcu_read_unlock(); kfree(preq_node); }