363 lines
13 KiB
C
363 lines
13 KiB
C
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/*
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* Copyright (c) 2008, 2009 open80211s Ltd.
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* Authors: Luis Carlos Cobo <luisca@cozybit.com>
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* Javier Cardona <javier@cozybit.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef IEEE80211S_H
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#define IEEE80211S_H
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#include <linux/types.h>
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#include <linux/jhash.h>
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#include "ieee80211_i.h"
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/* Data structures */
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/**
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* enum mesh_path_flags - mac80211 mesh path flags
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*
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* @MESH_PATH_ACTIVE: the mesh path can be used for forwarding
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* @MESH_PATH_RESOLVING: the discovery process is running for this mesh path
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* @MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence
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* number
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* @MESH_PATH_FIXED: the mesh path has been manually set and should not be
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* modified
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* @MESH_PATH_RESOLVED: the mesh path can has been resolved
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* @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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* @MESH_PATH_DELETED: the mesh path has been deleted and should no longer
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* be used
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*
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* 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 mesh_path_flags {
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MESH_PATH_ACTIVE = BIT(0),
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MESH_PATH_RESOLVING = BIT(1),
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MESH_PATH_SN_VALID = BIT(2),
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MESH_PATH_FIXED = BIT(3),
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MESH_PATH_RESOLVED = BIT(4),
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MESH_PATH_REQ_QUEUED = BIT(5),
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MESH_PATH_DELETED = BIT(6),
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};
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/**
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* enum mesh_deferred_task_flags - mac80211 mesh deferred tasks
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*
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*
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*
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* @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks
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* @MESH_WORK_ROOT: the mesh root station needs to send a frame
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* @MESH_WORK_DRIFT_ADJUST: time to compensate for clock drift relative to other
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* mesh nodes
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* @MESH_WORK_MBSS_CHANGED: rebuild beacon and notify driver of BSS changes
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*/
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enum mesh_deferred_task_flags {
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MESH_WORK_HOUSEKEEPING,
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MESH_WORK_ROOT,
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MESH_WORK_DRIFT_ADJUST,
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MESH_WORK_MBSS_CHANGED,
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};
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/**
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* struct mesh_path - mac80211 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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* @walk_list: linked list containing all mesh_path objects.
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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 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 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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struct rhash_head rhash;
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struct hlist_node walk_list;
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struct hlist_node gate_list;
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struct ieee80211_sub_if_data *sdata;
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struct sta_info __rcu *next_hop;
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struct timer_list timer;
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struct sk_buff_head frame_queue;
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struct 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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unsigned long exp_time;
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u32 discovery_timeout;
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u8 discovery_retries;
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enum mesh_path_flags flags;
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spinlock_t state_lock;
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u8 rann_snd_addr[ETH_ALEN];
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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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};
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/**
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* struct 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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* @walk_head: linked list containging all mesh_path objects
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* @walk_lock: lock protecting walk_head
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* @entries: number of entries in the table
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*/
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struct mesh_table {
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struct hlist_head known_gates;
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spinlock_t gates_lock;
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struct rhashtable rhead;
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struct hlist_head walk_head;
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spinlock_t walk_lock;
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atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */
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};
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/* Recent multicast cache */
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/* RMC_BUCKETS must be a power of 2, maximum 256 */
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#define RMC_BUCKETS 256
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#define RMC_QUEUE_MAX_LEN 4
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#define RMC_TIMEOUT (3 * HZ)
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/**
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* struct rmc_entry - entry in the Recent Multicast Cache
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*
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* @seqnum: mesh sequence number of the frame
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* @exp_time: expiration time of the entry, in jiffies
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* @sa: source address of the frame
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* @list: hashtable list pointer
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*
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* The Recent Multicast Cache keeps track of the latest multicast frames that
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* have been received by a mesh interface and discards received multicast frames
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* that are found in the cache.
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*/
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struct rmc_entry {
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struct hlist_node list;
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unsigned long exp_time;
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u32 seqnum;
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u8 sa[ETH_ALEN];
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};
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struct mesh_rmc {
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struct hlist_head bucket[RMC_BUCKETS];
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u32 idx_mask;
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};
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#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
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#define MESH_PATH_EXPIRE (600 * HZ)
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/* Default maximum number of plinks per interface */
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#define MESH_MAX_PLINKS 256
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/* Maximum number of paths per interface */
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#define MESH_MAX_MPATHS 1024
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/* Number of frames buffered per destination for unresolved destinations */
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#define MESH_FRAME_QUEUE_LEN 10
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/* Public interfaces */
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/* Various */
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int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
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const u8 *da, const u8 *sa);
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unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
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struct ieee80211s_hdr *meshhdr,
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const char *addr4or5, const char *addr6);
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int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
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const u8 *addr, struct ieee80211s_hdr *mesh_hdr);
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bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
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struct ieee802_11_elems *ie);
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void mesh_ids_set_default(struct ieee80211_if_mesh *mesh);
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int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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void mesh_rmc_free(struct ieee80211_sub_if_data *sdata);
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int mesh_rmc_init(struct ieee80211_sub_if_data *sdata);
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void ieee80211s_init(void);
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void ieee80211s_update_metric(struct ieee80211_local *local,
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struct sta_info *sta,
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struct ieee80211_tx_status *st);
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void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata);
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void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata);
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int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata);
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void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata);
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void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh);
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const struct ieee80211_mesh_sync_ops *ieee80211_mesh_sync_ops_get(u8 method);
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/* wrapper for ieee80211_bss_info_change_notify() */
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void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
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u32 changed);
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/* mesh power save */
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u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata);
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u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
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enum nl80211_mesh_power_mode pm);
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void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta,
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struct ieee80211_hdr *hdr);
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void ieee80211_mps_sta_status_update(struct sta_info *sta);
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void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
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struct ieee80211_hdr *hdr);
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void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
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bool tx, bool acked);
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void ieee80211_mps_frame_release(struct sta_info *sta,
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struct ieee802_11_elems *elems);
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/* Mesh paths */
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int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata);
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struct mesh_path *mesh_path_lookup(struct ieee80211_sub_if_data *sdata,
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const u8 *dst);
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struct mesh_path *mpp_path_lookup(struct ieee80211_sub_if_data *sdata,
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const u8 *dst);
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int mpp_path_add(struct ieee80211_sub_if_data *sdata,
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const u8 *dst, const u8 *mpp);
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struct mesh_path *
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mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
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struct mesh_path *
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mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx);
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void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop);
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void mesh_path_expire(struct ieee80211_sub_if_data *sdata);
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void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_mgmt *mgmt, size_t len);
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struct mesh_path *
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mesh_path_add(struct ieee80211_sub_if_data *sdata, const u8 *dst);
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int mesh_path_add_gate(struct mesh_path *mpath);
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int mesh_path_send_to_gates(struct mesh_path *mpath);
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int mesh_gate_num(struct ieee80211_sub_if_data *sdata);
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/* Mesh plinks */
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void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
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u8 *hw_addr, struct ieee802_11_elems *ie);
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bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie);
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u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata);
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void mesh_plink_timer(struct timer_list *t);
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void mesh_plink_broken(struct sta_info *sta);
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u32 mesh_plink_deactivate(struct sta_info *sta);
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u32 mesh_plink_open(struct sta_info *sta);
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u32 mesh_plink_block(struct sta_info *sta);
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void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_mgmt *mgmt, size_t len,
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struct ieee80211_rx_status *rx_status);
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void mesh_sta_cleanup(struct sta_info *sta);
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/* Private interfaces */
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/* Mesh paths */
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int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
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u8 ttl, const u8 *target, u32 target_sn,
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u16 target_rcode, const u8 *ra);
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void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);
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void mesh_path_flush_pending(struct mesh_path *mpath);
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void mesh_path_tx_pending(struct mesh_path *mpath);
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int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata);
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void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata);
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int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr);
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void mesh_path_timer(struct timer_list *t);
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void mesh_path_flush_by_nexthop(struct sta_info *sta);
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void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb);
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void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);
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bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
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#ifdef CONFIG_MAC80211_MESH
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static inline
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u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
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{
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atomic_inc(&sdata->u.mesh.estab_plinks);
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return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline
|
||
|
|
u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
|
||
|
|
{
|
||
|
|
atomic_dec(&sdata->u.mesh.estab_plinks);
|
||
|
|
return mesh_accept_plinks_update(sdata) | BSS_CHANGED_BEACON;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int mesh_plink_free_count(struct ieee80211_sub_if_data *sdata)
|
||
|
|
{
|
||
|
|
return sdata->u.mesh.mshcfg.dot11MeshMaxPeerLinks -
|
||
|
|
atomic_read(&sdata->u.mesh.estab_plinks);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline bool mesh_plink_availables(struct ieee80211_sub_if_data *sdata)
|
||
|
|
{
|
||
|
|
return (min_t(long, mesh_plink_free_count(sdata),
|
||
|
|
MESH_MAX_PLINKS - sdata->local->num_sta)) > 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void mesh_path_activate(struct mesh_path *mpath)
|
||
|
|
{
|
||
|
|
mpath->flags |= MESH_PATH_ACTIVE | MESH_PATH_RESOLVED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
|
||
|
|
{
|
||
|
|
return sdata->u.mesh.mesh_pp_id == IEEE80211_PATH_PROTOCOL_HWMP;
|
||
|
|
}
|
||
|
|
|
||
|
|
void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata);
|
||
|
|
void mesh_sync_adjust_tsf(struct ieee80211_sub_if_data *sdata);
|
||
|
|
void ieee80211s_stop(void);
|
||
|
|
#else
|
||
|
|
static inline bool mesh_path_sel_is_hwmp(struct ieee80211_sub_if_data *sdata)
|
||
|
|
{ return false; }
|
||
|
|
static inline void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
|
||
|
|
{}
|
||
|
|
static inline void ieee80211s_stop(void) {}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* IEEE80211S_H */
|