/** * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame * * @skb: 802.11 frame to be sent * @sdata: network subif the frame will be sent through * * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is * found, the function will start a path discovery and queue the frame so it is * sent when the path is resolved. This means the caller must not free the skb * in this case. */ int mesh_nexthop_lookup(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata) { struct sk_buff *skb_to_free = NULL; struct mesh_path *mpath; struct sta_info *next_hop; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; u8 *target_addr = hdr->addr3; int err = 0; rcu_read_lock(); mpath = mesh_path_lookup(target_addr, sdata); if (!mpath) { mesh_path_add(target_addr, sdata); mpath = mesh_path_lookup(target_addr, sdata); if (!mpath) { sdata->u.mesh.mshstats.dropped_frames_no_route++; err = -ENOSPC; goto endlookup; } } if (mpath->flags & MESH_PATH_ACTIVE) { if (time_after(jiffies, mpath->exp_time - msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && !memcmp(sdata->vif.addr, hdr->addr4, ETH_ALEN) && !(mpath->flags & MESH_PATH_RESOLVING) && !(mpath->flags & MESH_PATH_FIXED)) { mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); } next_hop = rcu_dereference(mpath->next_hop); if (next_hop) memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); else err = -ENOENT; } else { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); if (!(mpath->flags & MESH_PATH_RESOLVING)) { /* Start discovery only if it is not running yet */ mesh_queue_preq(mpath, PREQ_Q_F_START); } if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) skb_to_free = skb_dequeue(&mpath->frame_queue); info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; ieee80211_set_qos_hdr(sdata, skb); skb_queue_tail(&mpath->frame_queue, skb); if (skb_to_free) mesh_path_discard_frame(skb_to_free, sdata); err = -ENOENT; } endlookup: rcu_read_unlock(); return err; }
/** * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery * * @skb: 802.11 frame to be sent * @sdata: network subif the frame will be sent through * * Lookup next hop for given skb and start path discovery if no * forwarding information is found. * * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. * skb is freeed here if no mpath could be allocated. */ int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct mesh_path *mpath; struct sk_buff *skb_to_free = NULL; u8 *target_addr = hdr->addr3; int err = 0; /* Nulls are only sent to peers for PS and should be pre-addressed */ if (ieee80211_is_qos_nullfunc(hdr->frame_control)) return 0; rcu_read_lock(); err = mesh_nexthop_lookup(sdata, skb); if (!err) goto endlookup; /* no nexthop found, start resolving */ mpath = mesh_path_lookup(sdata, target_addr); if (!mpath) { mesh_path_add(sdata, target_addr); mpath = mesh_path_lookup(sdata, target_addr); if (!mpath) { mesh_path_discard_frame(sdata, skb); err = -ENOSPC; goto endlookup; } } if (!(mpath->flags & MESH_PATH_RESOLVING)) mesh_queue_preq(mpath, PREQ_Q_F_START); if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) skb_to_free = skb_dequeue(&mpath->frame_queue); info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; ieee80211_set_qos_hdr(sdata, skb); skb_queue_tail(&mpath->frame_queue, skb); err = -ENOENT; if (skb_to_free) mesh_path_discard_frame(sdata, skb_to_free); endlookup: rcu_read_unlock(); return err; }
static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); skb_set_mac_header(skb, 0); skb_set_network_header(skb, 0); skb_set_transport_header(skb, 0); skb_set_queue_mapping(skb, IEEE80211_AC_VO); skb->priority = 7; info->control.vif = &sdata->vif; ieee80211_set_qos_hdr(sdata, skb); }
/* Headroom is not adjusted. Caller should ensure that skb has sufficient * headroom in case the frame is encrypted. */ static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); skb_set_mac_header(skb, 0); skb_set_network_header(skb, 0); skb_set_transport_header(skb, 0); /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ skb_set_queue_mapping(skb, IEEE80211_AC_VO); skb->priority = 7; info->control.vif = &sdata->vif; info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; ieee80211_set_qos_hdr(sdata, skb); }