209 lines
7.3 KiB
C
209 lines
7.3 KiB
C
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/******************************************************************************
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*
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* Copyright(c) 2007 - 2017 Realtek Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*****************************************************************************/
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#ifndef __RTW_MESH_PATHTBL_H_
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#define __RTW_MESH_PATHTBL_H_
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#ifndef DBG_RTW_MPATH
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#define DBG_RTW_MPATH 1
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#endif
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#if DBG_RTW_MPATH
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#define RTW_MPATH_DBG(fmt, arg...) RTW_PRINT(fmt, ##arg)
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#else
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#define RTW_MPATH_DBG(fmt, arg...) do {} while (0)
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#endif
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/**
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* enum rtw_mesh_path_flags - mesh path flags
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*
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* @RTW_MESH_PATH_ACTIVE: the mesh path can be used for forwarding
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* @RTW_MESH_PATH_RESOLVING: the discovery process is running for this mesh path
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* @RTW_MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence
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* number
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* @RTW_MESH_PATH_FIXED: the mesh path has been manually set and should not be
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* modified
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* @RTW_MESH_PATH_RESOLVED: the mesh path can has been resolved
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* @RTW_MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination
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* already queued up, waiting for the discovery process to start.
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* @RTW_MESH_PATH_DELETED: the mesh path has been deleted and should no longer
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* be used
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* @RTW_MESH_PATH_ROOT_ADD_CHK: root additional check in root mode.
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* With this flag, It will try the last used rann_snd_addr
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* @RTW_MESH_PATH_PEER_AKA: only used toward a peer, only used in active keep
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* alive mechanism. PREQ's da = path dst
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*
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* RTW_MESH_PATH_RESOLVED is used by the mesh path timer to
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* decide when to stop or cancel the mesh path discovery.
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*/
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enum rtw_mesh_path_flags {
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RTW_MESH_PATH_ACTIVE = BIT(0),
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RTW_MESH_PATH_RESOLVING = BIT(1),
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RTW_MESH_PATH_SN_VALID = BIT(2),
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RTW_MESH_PATH_FIXED = BIT(3),
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RTW_MESH_PATH_RESOLVED = BIT(4),
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RTW_MESH_PATH_REQ_QUEUED = BIT(5),
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RTW_MESH_PATH_DELETED = BIT(6),
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RTW_MESH_PATH_ROOT_ADD_CHK = BIT(7),
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RTW_MESH_PATH_PEER_AKA = BIT(8),
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};
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/**
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* struct rtw_mesh_path - mesh path structure
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*
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* @dst: mesh path destination mac address
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* @mpp: mesh proxy mac address
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* @rhash: rhashtable list pointer
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* @gate_list: list pointer for known gates list
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* @sdata: mesh subif
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* @next_hop: mesh neighbor to which frames for this destination will be
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* forwarded
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* @timer: mesh path discovery timer
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* @frame_queue: pending queue for frames sent to this destination while the
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* path is unresolved
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* @rcu: rcu head for freeing mesh path
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* @sn: target sequence number
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* @metric: current metric to this destination
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* @hop_count: hops to destination
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* @exp_time: in jiffies, when the path will expire or when it expired
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* @discovery_timeout: timeout (lapse in jiffies) used for the last discovery
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* retry
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* @discovery_retries: number of discovery retries
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* @flags: mesh path flags, as specified on &enum rtw_mesh_path_flags
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* @state_lock: mesh path state lock used to protect changes to the
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* mpath itself. No need to take this lock when adding or removing
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* an mpath to a hash bucket on a path table.
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* @rann_snd_addr: the RANN sender address
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* @rann_metric: the aggregated path metric towards the root node
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* @last_preq_to_root: Timestamp of last PREQ sent to root
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* @is_root: the destination station of this path is a root node
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* @is_gate: the destination station of this path is a mesh gate
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*
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*
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* The dst address is unique in the mesh path table. Since the mesh_path is
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* protected by RCU, deleting the next_hop STA must remove / substitute the
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* mesh_path structure and wait until that is no longer reachable before
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* destroying the STA completely.
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*/
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struct rtw_mesh_path {
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u8 dst[ETH_ALEN];
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u8 mpp[ETH_ALEN]; /* used for MPP or MAP */
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rtw_rhash_head rhash;
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rtw_hlist_node gate_list;
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_adapter *adapter;
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struct sta_info __rcu *next_hop;
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_timer timer;
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_queue frame_queue;
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u32 frame_queue_len;
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rtw_rcu_head rcu;
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u32 sn;
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u32 metric;
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u8 hop_count;
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systime exp_time;
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systime discovery_timeout;
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systime gate_timeout;
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u32 gate_ann_int; /* gate announce interval */
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u8 discovery_retries;
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enum rtw_mesh_path_flags flags;
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_lock state_lock;
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u8 rann_snd_addr[ETH_ALEN];
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#ifdef CONFIG_RTW_MESH_ADD_ROOT_CHK
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u8 add_chk_rann_snd_addr[ETH_ALEN];
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#endif
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u32 rann_metric;
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unsigned long last_preq_to_root;
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bool is_root;
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bool is_gate;
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bool gate_asked;
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};
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/**
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* struct rtw_mesh_table
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*
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* @known_gates: list of known mesh gates and their mpaths by the station. The
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* gate's mpath may or may not be resolved and active.
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* @gates_lock: protects updates to known_gates
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* @rhead: the rhashtable containing struct mesh_paths, keyed by dest addr
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* @entries: number of entries in the table
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*/
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struct rtw_mesh_table {
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rtw_hlist_head known_gates;
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_lock gates_lock;
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rtw_rhashtable rhead;
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ATOMIC_T entries;
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};
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#define RTW_MESH_PATH_EXPIRE (600 * HZ)
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/* Maximum number of paths per interface */
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#define RTW_MESH_MAX_MPATHS 1024
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/* Number of frames buffered per destination for unresolved destinations */
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#define RTW_MESH_FRAME_QUEUE_LEN 10
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int rtw_mesh_nexthop_lookup(_adapter *adapter,
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const u8 *mda, const u8 *msa, u8 *ra);
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int rtw_mesh_nexthop_resolve(_adapter *adapter,
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struct xmit_frame *xframe);
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struct rtw_mesh_path *rtw_mesh_path_lookup(_adapter *adapter,
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const u8 *dst);
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struct rtw_mesh_path *rtw_mpp_path_lookup(_adapter *adapter,
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const u8 *dst);
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int rtw_mpp_path_add(_adapter *adapter,
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const u8 *dst, const u8 *mpp);
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void dump_mpp(void *sel, _adapter *adapter);
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struct rtw_mesh_path *
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rtw_mesh_path_lookup_by_idx(_adapter *adapter, int idx);
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void dump_mpath(void *sel, _adapter *adapter);
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struct rtw_mesh_path *
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rtw_mpp_path_lookup_by_idx(_adapter *adapter, int idx);
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void rtw_mesh_path_fix_nexthop(struct rtw_mesh_path *mpath, struct sta_info *next_hop);
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void rtw_mesh_path_expire(_adapter *adapter);
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struct rtw_mesh_path *
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rtw_mesh_path_add(_adapter *adapter, const u8 *dst);
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int rtw_mesh_path_add_gate(struct rtw_mesh_path *mpath);
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void rtw_mesh_gate_del(struct rtw_mesh_table *tbl, struct rtw_mesh_path *mpath);
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bool rtw_mesh_gate_search(struct rtw_mesh_table *tbl, const u8 *addr);
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int rtw_mesh_path_send_to_gates(struct rtw_mesh_path *mpath);
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int rtw_mesh_gate_num(_adapter *adapter);
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bool rtw_mesh_is_primary_gate(_adapter *adapter);
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void dump_known_gates(void *sel, _adapter *adapter);
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void rtw_mesh_plink_broken(struct sta_info *sta);
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void rtw_mesh_path_assign_nexthop(struct rtw_mesh_path *mpath, struct sta_info *sta);
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void rtw_mesh_path_flush_pending(struct rtw_mesh_path *mpath);
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void rtw_mesh_path_tx_pending(struct rtw_mesh_path *mpath);
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int rtw_mesh_pathtbl_init(_adapter *adapter);
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void rtw_mesh_pathtbl_unregister(_adapter *adapter);
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int rtw_mesh_path_del(_adapter *adapter, const u8 *addr);
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void rtw_mesh_path_flush_by_nexthop(struct sta_info *sta);
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void rtw_mesh_path_discard_frame(_adapter *adapter,
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struct xmit_frame *xframe);
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static inline void rtw_mesh_path_activate(struct rtw_mesh_path *mpath)
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{
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mpath->flags |= RTW_MESH_PATH_ACTIVE | RTW_MESH_PATH_RESOLVED;
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}
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void rtw_mesh_path_flush_by_iface(_adapter *adapter);
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#endif /* __RTW_MESH_PATHTBL_H_ */
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