1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2eb2b9311SLuis Carlos Cobo /* 3264d9b7dSRui Paulo * Copyright (c) 2008, 2009 open80211s Ltd. 4eb2b9311SLuis Carlos Cobo * Author: Luis Carlos Cobo <luisca@cozybit.com> 5eb2b9311SLuis Carlos Cobo */ 6eb2b9311SLuis Carlos Cobo 7eb2b9311SLuis Carlos Cobo #include <linux/etherdevice.h> 8eb2b9311SLuis Carlos Cobo #include <linux/list.h> 9eb2b9311SLuis Carlos Cobo #include <linux/random.h> 105a0e3ad6STejun Heo #include <linux/slab.h> 11eb2b9311SLuis Carlos Cobo #include <linux/spinlock.h> 12eb2b9311SLuis Carlos Cobo #include <linux/string.h> 13eb2b9311SLuis Carlos Cobo #include <net/mac80211.h> 144777be41SJavier Cardona #include "wme.h" 15eb2b9311SLuis Carlos Cobo #include "ieee80211_i.h" 16eb2b9311SLuis Carlos Cobo #include "mesh.h" 17eb2b9311SLuis Carlos Cobo 1874932959SBob Copeland static void mesh_path_free_rcu(struct mesh_table *tbl, struct mesh_path *mpath); 1974932959SBob Copeland 2060854fd9SBob Copeland static u32 mesh_table_hash(const void *addr, u32 len, u32 seed) 2160854fd9SBob Copeland { 2260854fd9SBob Copeland /* Use last four bytes of hw addr as hash index */ 2340586e3fSFelix Fietkau return jhash_1word(__get_unaligned_cpu32((u8 *)addr + 2), seed); 2460854fd9SBob Copeland } 25eb2b9311SLuis Carlos Cobo 2660854fd9SBob Copeland static const struct rhashtable_params mesh_rht_params = { 2760854fd9SBob Copeland .nelem_hint = 2, 2860854fd9SBob Copeland .automatic_shrinking = true, 2960854fd9SBob Copeland .key_len = ETH_ALEN, 3060854fd9SBob Copeland .key_offset = offsetof(struct mesh_path, dst), 3160854fd9SBob Copeland .head_offset = offsetof(struct mesh_path, rhash), 3260854fd9SBob Copeland .hashfn = mesh_table_hash, 3360854fd9SBob Copeland }; 34eb2b9311SLuis Carlos Cobo 35bf7cd94dSJohannes Berg static inline bool mpath_expired(struct mesh_path *mpath) 36bf7cd94dSJohannes Berg { 37bf7cd94dSJohannes Berg return (mpath->flags & MESH_PATH_ACTIVE) && 38bf7cd94dSJohannes Berg time_after(jiffies, mpath->exp_time) && 39bf7cd94dSJohannes Berg !(mpath->flags & MESH_PATH_FIXED); 40bf7cd94dSJohannes Berg } 41eb2b9311SLuis Carlos Cobo 4274932959SBob Copeland static void mesh_path_rht_free(void *ptr, void *tblptr) 43349eb8cfSJohannes Berg { 4460854fd9SBob Copeland struct mesh_path *mpath = ptr; 4574932959SBob Copeland struct mesh_table *tbl = tblptr; 4674932959SBob Copeland 4774932959SBob Copeland mesh_path_free_rcu(tbl, mpath); 48349eb8cfSJohannes Berg } 49349eb8cfSJohannes Berg 50*8b5cb7e4SPavel Skripkin static void mesh_table_init(struct mesh_table *tbl) 51349eb8cfSJohannes Berg { 52*8b5cb7e4SPavel Skripkin INIT_HLIST_HEAD(&tbl->known_gates); 53*8b5cb7e4SPavel Skripkin INIT_HLIST_HEAD(&tbl->walk_head); 54*8b5cb7e4SPavel Skripkin atomic_set(&tbl->entries, 0); 55*8b5cb7e4SPavel Skripkin spin_lock_init(&tbl->gates_lock); 56*8b5cb7e4SPavel Skripkin spin_lock_init(&tbl->walk_lock); 576b86bd62SJohannes Berg 58*8b5cb7e4SPavel Skripkin /* rhashtable_init() may fail only in case of wrong 59*8b5cb7e4SPavel Skripkin * mesh_rht_params 60*8b5cb7e4SPavel Skripkin */ 61*8b5cb7e4SPavel Skripkin WARN_ON(rhashtable_init(&tbl->rhead, &mesh_rht_params)); 626b86bd62SJohannes Berg } 636b86bd62SJohannes Berg 6460854fd9SBob Copeland static void mesh_table_free(struct mesh_table *tbl) 6518889231SJavier Cardona { 6660854fd9SBob Copeland rhashtable_free_and_destroy(&tbl->rhead, 6774932959SBob Copeland mesh_path_rht_free, tbl); 6818889231SJavier Cardona } 6918889231SJavier Cardona 70eb2b9311SLuis Carlos Cobo /** 71eb2b9311SLuis Carlos Cobo * mesh_path_assign_nexthop - update mesh path next hop 72eb2b9311SLuis Carlos Cobo * 73eb2b9311SLuis Carlos Cobo * @mpath: mesh path to update 74eb2b9311SLuis Carlos Cobo * @sta: next hop to assign 75eb2b9311SLuis Carlos Cobo * 76eb2b9311SLuis Carlos Cobo * Locking: mpath->state_lock must be held when calling this function 77eb2b9311SLuis Carlos Cobo */ 78eb2b9311SLuis Carlos Cobo void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) 79eb2b9311SLuis Carlos Cobo { 8010c836d7SJavier Cardona struct sk_buff *skb; 8110c836d7SJavier Cardona struct ieee80211_hdr *hdr; 8210c836d7SJavier Cardona unsigned long flags; 8310c836d7SJavier Cardona 84d0709a65SJohannes Berg rcu_assign_pointer(mpath->next_hop, sta); 8510c836d7SJavier Cardona 8610c836d7SJavier Cardona spin_lock_irqsave(&mpath->frame_queue.lock, flags); 87b22bd522SThomas Pedersen skb_queue_walk(&mpath->frame_queue, skb) { 8810c836d7SJavier Cardona hdr = (struct ieee80211_hdr *) skb->data; 8910c836d7SJavier Cardona memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 907e3c8866SThomas Pedersen memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); 913f52b7e3SMarco Porsch ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); 9210c836d7SJavier Cardona } 9310c836d7SJavier Cardona 9410c836d7SJavier Cardona spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); 95eb2b9311SLuis Carlos Cobo } 96eb2b9311SLuis Carlos Cobo 975ee68e5bSJavier Cardona static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, 985ee68e5bSJavier Cardona struct mesh_path *gate_mpath) 995ee68e5bSJavier Cardona { 1005ee68e5bSJavier Cardona struct ieee80211_hdr *hdr; 1015ee68e5bSJavier Cardona struct ieee80211s_hdr *mshdr; 1025ee68e5bSJavier Cardona int mesh_hdrlen, hdrlen; 1035ee68e5bSJavier Cardona char *next_hop; 1045ee68e5bSJavier Cardona 1055ee68e5bSJavier Cardona hdr = (struct ieee80211_hdr *) skb->data; 1065ee68e5bSJavier Cardona hdrlen = ieee80211_hdrlen(hdr->frame_control); 1075ee68e5bSJavier Cardona mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 1085ee68e5bSJavier Cardona 1095ee68e5bSJavier Cardona if (!(mshdr->flags & MESH_FLAGS_AE)) { 1105ee68e5bSJavier Cardona /* size of the fixed part of the mesh header */ 1115ee68e5bSJavier Cardona mesh_hdrlen = 6; 1125ee68e5bSJavier Cardona 1135ee68e5bSJavier Cardona /* make room for the two extended addresses */ 1145ee68e5bSJavier Cardona skb_push(skb, 2 * ETH_ALEN); 1155ee68e5bSJavier Cardona memmove(skb->data, hdr, hdrlen + mesh_hdrlen); 1165ee68e5bSJavier Cardona 1175ee68e5bSJavier Cardona hdr = (struct ieee80211_hdr *) skb->data; 1185ee68e5bSJavier Cardona 1195ee68e5bSJavier Cardona /* we preserve the previous mesh header and only add 120ab4040dfSZheng Yongjun * the new addresses */ 1215ee68e5bSJavier Cardona mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 1225ee68e5bSJavier Cardona mshdr->flags = MESH_FLAGS_AE_A5_A6; 1235ee68e5bSJavier Cardona memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); 1245ee68e5bSJavier Cardona memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); 1255ee68e5bSJavier Cardona } 1265ee68e5bSJavier Cardona 1275ee68e5bSJavier Cardona /* update next hop */ 1285ee68e5bSJavier Cardona hdr = (struct ieee80211_hdr *) skb->data; 1295ee68e5bSJavier Cardona rcu_read_lock(); 1305ee68e5bSJavier Cardona next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; 1315ee68e5bSJavier Cardona memcpy(hdr->addr1, next_hop, ETH_ALEN); 1325ee68e5bSJavier Cardona rcu_read_unlock(); 1337e3c8866SThomas Pedersen memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); 1345ee68e5bSJavier Cardona memcpy(hdr->addr3, dst_addr, ETH_ALEN); 1355ee68e5bSJavier Cardona } 1365ee68e5bSJavier Cardona 1375ee68e5bSJavier Cardona /** 1385ee68e5bSJavier Cardona * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another 1395ee68e5bSJavier Cardona * 1405ee68e5bSJavier Cardona * This function is used to transfer or copy frames from an unresolved mpath to 1415ee68e5bSJavier Cardona * a gate mpath. The function also adds the Address Extension field and 1425ee68e5bSJavier Cardona * updates the next hop. 1435ee68e5bSJavier Cardona * 1445ee68e5bSJavier Cardona * If a frame already has an Address Extension field, only the next hop and 1455ee68e5bSJavier Cardona * destination addresses are updated. 1465ee68e5bSJavier Cardona * 1475ee68e5bSJavier Cardona * The gate mpath must be an active mpath with a valid mpath->next_hop. 1485ee68e5bSJavier Cardona * 1499fd00b4dSAndrew Lunn * @gate_mpath: An active mpath the frames will be sent to (i.e. the gate) 1505ee68e5bSJavier Cardona * @from_mpath: The failed mpath 1515ee68e5bSJavier Cardona * @copy: When true, copy all the frames to the new mpath queue. When false, 1525ee68e5bSJavier Cardona * move them. 1535ee68e5bSJavier Cardona */ 1545ee68e5bSJavier Cardona static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, 1555ee68e5bSJavier Cardona struct mesh_path *from_mpath, 1565ee68e5bSJavier Cardona bool copy) 1575ee68e5bSJavier Cardona { 1584bd4c2ddSThomas Pedersen struct sk_buff *skb, *fskb, *tmp; 1594bd4c2ddSThomas Pedersen struct sk_buff_head failq; 1605ee68e5bSJavier Cardona unsigned long flags; 1615ee68e5bSJavier Cardona 1628c5bb1faSJohannes Berg if (WARN_ON(gate_mpath == from_mpath)) 1638c5bb1faSJohannes Berg return; 1648c5bb1faSJohannes Berg if (WARN_ON(!gate_mpath->next_hop)) 1658c5bb1faSJohannes Berg return; 1665ee68e5bSJavier Cardona 1675ee68e5bSJavier Cardona __skb_queue_head_init(&failq); 1685ee68e5bSJavier Cardona 1695ee68e5bSJavier Cardona spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); 1705ee68e5bSJavier Cardona skb_queue_splice_init(&from_mpath->frame_queue, &failq); 1715ee68e5bSJavier Cardona spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); 1725ee68e5bSJavier Cardona 1734bd4c2ddSThomas Pedersen skb_queue_walk_safe(&failq, fskb, tmp) { 1744bd4c2ddSThomas Pedersen if (skb_queue_len(&gate_mpath->frame_queue) >= 1754bd4c2ddSThomas Pedersen MESH_FRAME_QUEUE_LEN) { 1764bd4c2ddSThomas Pedersen mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); 1774bd4c2ddSThomas Pedersen break; 178817a53d9SJohn W. Linville } 1795ee68e5bSJavier Cardona 1804bd4c2ddSThomas Pedersen skb = skb_copy(fskb, GFP_ATOMIC); 1814bd4c2ddSThomas Pedersen if (WARN_ON(!skb)) 1824bd4c2ddSThomas Pedersen break; 1834bd4c2ddSThomas Pedersen 1845ee68e5bSJavier Cardona prepare_for_gate(skb, gate_mpath->dst, gate_mpath); 1854bd4c2ddSThomas Pedersen skb_queue_tail(&gate_mpath->frame_queue, skb); 1864bd4c2ddSThomas Pedersen 1874bd4c2ddSThomas Pedersen if (copy) 1884bd4c2ddSThomas Pedersen continue; 1894bd4c2ddSThomas Pedersen 1904bd4c2ddSThomas Pedersen __skb_unlink(fskb, &failq); 1914bd4c2ddSThomas Pedersen kfree_skb(fskb); 1925ee68e5bSJavier Cardona } 1935ee68e5bSJavier Cardona 194bdcbd8e0SJohannes Berg mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", 195bdcbd8e0SJohannes Berg gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); 1965ee68e5bSJavier Cardona 1975ee68e5bSJavier Cardona if (!copy) 1985ee68e5bSJavier Cardona return; 1995ee68e5bSJavier Cardona 2005ee68e5bSJavier Cardona spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); 2015ee68e5bSJavier Cardona skb_queue_splice(&failq, &from_mpath->frame_queue); 2025ee68e5bSJavier Cardona spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); 2035ee68e5bSJavier Cardona } 2045ee68e5bSJavier Cardona 205eb2b9311SLuis Carlos Cobo 2064a3cb702SJohannes Berg static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, 207239289e4SJavier Cardona struct ieee80211_sub_if_data *sdata) 208239289e4SJavier Cardona { 209239289e4SJavier Cardona struct mesh_path *mpath; 210239289e4SJavier Cardona 211ef618b1bSFelix Fietkau mpath = rhashtable_lookup(&tbl->rhead, dst, mesh_rht_params); 21260854fd9SBob Copeland 21360854fd9SBob Copeland if (mpath && mpath_expired(mpath)) { 214239289e4SJavier Cardona spin_lock_bh(&mpath->state_lock); 215239289e4SJavier Cardona mpath->flags &= ~MESH_PATH_ACTIVE; 216239289e4SJavier Cardona spin_unlock_bh(&mpath->state_lock); 217239289e4SJavier Cardona } 218239289e4SJavier Cardona return mpath; 219239289e4SJavier Cardona } 220239289e4SJavier Cardona 221eb2b9311SLuis Carlos Cobo /** 222eb2b9311SLuis Carlos Cobo * mesh_path_lookup - look up a path in the mesh path table 223f698d856SJasper Bryant-Greene * @sdata: local subif 224bf7cd94dSJohannes Berg * @dst: hardware address (ETH_ALEN length) of destination 225eb2b9311SLuis Carlos Cobo * 226eb2b9311SLuis Carlos Cobo * Returns: pointer to the mesh path structure, or NULL if not found 227eb2b9311SLuis Carlos Cobo * 228eb2b9311SLuis Carlos Cobo * Locking: must be called within a read rcu section. 229eb2b9311SLuis Carlos Cobo */ 230bf7cd94dSJohannes Berg struct mesh_path * 231bf7cd94dSJohannes Berg mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) 232eb2b9311SLuis Carlos Cobo { 233*8b5cb7e4SPavel Skripkin return mpath_lookup(&sdata->u.mesh.mesh_paths, dst, sdata); 234eb2b9311SLuis Carlos Cobo } 235eb2b9311SLuis Carlos Cobo 236bf7cd94dSJohannes Berg struct mesh_path * 237bf7cd94dSJohannes Berg mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) 23879617deeSYanBo { 239*8b5cb7e4SPavel Skripkin return mpath_lookup(&sdata->u.mesh.mpp_paths, dst, sdata); 24079617deeSYanBo } 24179617deeSYanBo 24260854fd9SBob Copeland static struct mesh_path * 24360854fd9SBob Copeland __mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx) 24460854fd9SBob Copeland { 245b4c3fbe6SHerbert Xu int i = 0; 246b4c3fbe6SHerbert Xu struct mesh_path *mpath; 24760854fd9SBob Copeland 248b4c3fbe6SHerbert Xu hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { 24960854fd9SBob Copeland if (i++ == idx) 25060854fd9SBob Copeland break; 25160854fd9SBob Copeland } 25260854fd9SBob Copeland 253b4c3fbe6SHerbert Xu if (!mpath) 25460854fd9SBob Copeland return NULL; 25560854fd9SBob Copeland 25660854fd9SBob Copeland if (mpath_expired(mpath)) { 25760854fd9SBob Copeland spin_lock_bh(&mpath->state_lock); 25860854fd9SBob Copeland mpath->flags &= ~MESH_PATH_ACTIVE; 25960854fd9SBob Copeland spin_unlock_bh(&mpath->state_lock); 26060854fd9SBob Copeland } 26160854fd9SBob Copeland return mpath; 26260854fd9SBob Copeland } 26379617deeSYanBo 264eb2b9311SLuis Carlos Cobo /** 265eb2b9311SLuis Carlos Cobo * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index 266eb2b9311SLuis Carlos Cobo * @idx: index 267f698d856SJasper Bryant-Greene * @sdata: local subif, or NULL for all entries 268eb2b9311SLuis Carlos Cobo * 269eb2b9311SLuis Carlos Cobo * Returns: pointer to the mesh path structure, or NULL if not found. 270eb2b9311SLuis Carlos Cobo * 271eb2b9311SLuis Carlos Cobo * Locking: must be called within a read rcu section. 272eb2b9311SLuis Carlos Cobo */ 273bf7cd94dSJohannes Berg struct mesh_path * 274bf7cd94dSJohannes Berg mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) 275eb2b9311SLuis Carlos Cobo { 276*8b5cb7e4SPavel Skripkin return __mesh_path_lookup_by_idx(&sdata->u.mesh.mesh_paths, idx); 277eb2b9311SLuis Carlos Cobo } 278eb2b9311SLuis Carlos Cobo 2795ee68e5bSJavier Cardona /** 280a2db2ed3SHenning Rogge * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index 281a2db2ed3SHenning Rogge * @idx: index 282a2db2ed3SHenning Rogge * @sdata: local subif, or NULL for all entries 283a2db2ed3SHenning Rogge * 284a2db2ed3SHenning Rogge * Returns: pointer to the proxy path structure, or NULL if not found. 285a2db2ed3SHenning Rogge * 286a2db2ed3SHenning Rogge * Locking: must be called within a read rcu section. 287a2db2ed3SHenning Rogge */ 288a2db2ed3SHenning Rogge struct mesh_path * 289a2db2ed3SHenning Rogge mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) 290a2db2ed3SHenning Rogge { 291*8b5cb7e4SPavel Skripkin return __mesh_path_lookup_by_idx(&sdata->u.mesh.mpp_paths, idx); 292a2db2ed3SHenning Rogge } 293a2db2ed3SHenning Rogge 294a2db2ed3SHenning Rogge /** 29530be52e4SJohannes Berg * mesh_path_add_gate - add the given mpath to a mesh gate to our path table 29630be52e4SJohannes Berg * @mpath: gate path to add to table 2975ee68e5bSJavier Cardona */ 29830be52e4SJohannes Berg int mesh_path_add_gate(struct mesh_path *mpath) 2995ee68e5bSJavier Cardona { 30030be52e4SJohannes Berg struct mesh_table *tbl; 3015ee68e5bSJavier Cardona int err; 3025ee68e5bSJavier Cardona 3035ee68e5bSJavier Cardona rcu_read_lock(); 304*8b5cb7e4SPavel Skripkin tbl = &mpath->sdata->u.mesh.mesh_paths; 3055ee68e5bSJavier Cardona 306947c2a0eSBob Copeland spin_lock_bh(&mpath->state_lock); 307947c2a0eSBob Copeland if (mpath->is_gate) { 3085ee68e5bSJavier Cardona err = -EEXIST; 309947c2a0eSBob Copeland spin_unlock_bh(&mpath->state_lock); 3105ee68e5bSJavier Cardona goto err_rcu; 3115ee68e5bSJavier Cardona } 3125ee68e5bSJavier Cardona mpath->is_gate = true; 3135ee68e5bSJavier Cardona mpath->sdata->u.mesh.num_gates++; 314947c2a0eSBob Copeland 315947c2a0eSBob Copeland spin_lock(&tbl->gates_lock); 31618b27ff7SBob Copeland hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates); 317947c2a0eSBob Copeland spin_unlock(&tbl->gates_lock); 318947c2a0eSBob Copeland 319947c2a0eSBob Copeland spin_unlock_bh(&mpath->state_lock); 320947c2a0eSBob Copeland 321bdcbd8e0SJohannes Berg mpath_dbg(mpath->sdata, 322bdcbd8e0SJohannes Berg "Mesh path: Recorded new gate: %pM. %d known gates\n", 323bdcbd8e0SJohannes Berg mpath->dst, mpath->sdata->u.mesh.num_gates); 324bf7cd94dSJohannes Berg err = 0; 3255ee68e5bSJavier Cardona err_rcu: 3265ee68e5bSJavier Cardona rcu_read_unlock(); 3275ee68e5bSJavier Cardona return err; 3285ee68e5bSJavier Cardona } 3295ee68e5bSJavier Cardona 3305ee68e5bSJavier Cardona /** 3315ee68e5bSJavier Cardona * mesh_gate_del - remove a mesh gate from the list of known gates 3325ee68e5bSJavier Cardona * @tbl: table which holds our list of known gates 3335ee68e5bSJavier Cardona * @mpath: gate mpath 3345ee68e5bSJavier Cardona */ 335bf7cd94dSJohannes Berg static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) 3365ee68e5bSJavier Cardona { 337947c2a0eSBob Copeland lockdep_assert_held(&mpath->state_lock); 338947c2a0eSBob Copeland if (!mpath->is_gate) 339947c2a0eSBob Copeland return; 3405ee68e5bSJavier Cardona 3415ee68e5bSJavier Cardona mpath->is_gate = false; 342947c2a0eSBob Copeland spin_lock_bh(&tbl->gates_lock); 343947c2a0eSBob Copeland hlist_del_rcu(&mpath->gate_list); 344947c2a0eSBob Copeland mpath->sdata->u.mesh.num_gates--; 345947c2a0eSBob Copeland spin_unlock_bh(&tbl->gates_lock); 346947c2a0eSBob Copeland 347bdcbd8e0SJohannes Berg mpath_dbg(mpath->sdata, 348bdcbd8e0SJohannes Berg "Mesh path: Deleted gate: %pM. %d known gates\n", 3495ee68e5bSJavier Cardona mpath->dst, mpath->sdata->u.mesh.num_gates); 3505ee68e5bSJavier Cardona } 3515ee68e5bSJavier Cardona 3525ee68e5bSJavier Cardona /** 3535ee68e5bSJavier Cardona * mesh_gate_num - number of gates known to this interface 3545ee68e5bSJavier Cardona * @sdata: subif data 3555ee68e5bSJavier Cardona */ 3565ee68e5bSJavier Cardona int mesh_gate_num(struct ieee80211_sub_if_data *sdata) 3575ee68e5bSJavier Cardona { 3585ee68e5bSJavier Cardona return sdata->u.mesh.num_gates; 3595ee68e5bSJavier Cardona } 3605ee68e5bSJavier Cardona 361b15dc38bSBob Copeland static 362b15dc38bSBob Copeland struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata, 363b15dc38bSBob Copeland const u8 *dst, gfp_t gfp_flags) 364b15dc38bSBob Copeland { 365b15dc38bSBob Copeland struct mesh_path *new_mpath; 366b15dc38bSBob Copeland 367b15dc38bSBob Copeland new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags); 368b15dc38bSBob Copeland if (!new_mpath) 369b15dc38bSBob Copeland return NULL; 370b15dc38bSBob Copeland 371b15dc38bSBob Copeland memcpy(new_mpath->dst, dst, ETH_ALEN); 372b15dc38bSBob Copeland eth_broadcast_addr(new_mpath->rann_snd_addr); 373b15dc38bSBob Copeland new_mpath->is_root = false; 374b15dc38bSBob Copeland new_mpath->sdata = sdata; 375b15dc38bSBob Copeland new_mpath->flags = 0; 376b15dc38bSBob Copeland skb_queue_head_init(&new_mpath->frame_queue); 377b15dc38bSBob Copeland new_mpath->exp_time = jiffies; 378b15dc38bSBob Copeland spin_lock_init(&new_mpath->state_lock); 37934f11cd3SKees Cook timer_setup(&new_mpath->timer, mesh_path_timer, 0); 380b15dc38bSBob Copeland 381b15dc38bSBob Copeland return new_mpath; 382b15dc38bSBob Copeland } 383b15dc38bSBob Copeland 384eb2b9311SLuis Carlos Cobo /** 385eb2b9311SLuis Carlos Cobo * mesh_path_add - allocate and add a new path to the mesh path table 386bf7cd94dSJohannes Berg * @dst: destination address of the path (ETH_ALEN length) 387f698d856SJasper Bryant-Greene * @sdata: local subif 388eb2b9311SLuis Carlos Cobo * 389af901ca1SAndré Goddard Rosa * Returns: 0 on success 390eb2b9311SLuis Carlos Cobo * 391eb2b9311SLuis Carlos Cobo * State: the initial state of the new path is set to 0 392eb2b9311SLuis Carlos Cobo */ 393ae76eef0SBob Copeland struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, 394ae76eef0SBob Copeland const u8 *dst) 395eb2b9311SLuis Carlos Cobo { 396349eb8cfSJohannes Berg struct mesh_table *tbl; 397eb2b9311SLuis Carlos Cobo struct mesh_path *mpath, *new_mpath; 398eb2b9311SLuis Carlos Cobo 399b203ca39SJoe Perches if (ether_addr_equal(dst, sdata->vif.addr)) 400eb2b9311SLuis Carlos Cobo /* never add ourselves as neighbours */ 401ae76eef0SBob Copeland return ERR_PTR(-ENOTSUPP); 402eb2b9311SLuis Carlos Cobo 403eb2b9311SLuis Carlos Cobo if (is_multicast_ether_addr(dst)) 404ae76eef0SBob Copeland return ERR_PTR(-ENOTSUPP); 405eb2b9311SLuis Carlos Cobo 406472dbc45SJohannes Berg if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) 407ae76eef0SBob Copeland return ERR_PTR(-ENOSPC); 408ae76eef0SBob Copeland 409b15dc38bSBob Copeland new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); 410402d7752SPavel Emelyanov if (!new_mpath) 41160854fd9SBob Copeland return ERR_PTR(-ENOMEM); 412402d7752SPavel Emelyanov 413*8b5cb7e4SPavel Skripkin tbl = &sdata->u.mesh.mesh_paths; 414b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 41536922931SHerbert Xu mpath = rhashtable_lookup_get_insert_fast(&tbl->rhead, 41660854fd9SBob Copeland &new_mpath->rhash, 41760854fd9SBob Copeland mesh_rht_params); 41836922931SHerbert Xu if (!mpath) 419b4c3fbe6SHerbert Xu hlist_add_head(&new_mpath->walk_list, &tbl->walk_head); 420b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 421f5ea9120SJohannes Berg 42236922931SHerbert Xu if (mpath) { 4234ff3a9d1SHerbert Xu kfree(new_mpath); 4244ff3a9d1SHerbert Xu 42536922931SHerbert Xu if (IS_ERR(mpath)) 42636922931SHerbert Xu return mpath; 427ae76eef0SBob Copeland 42860854fd9SBob Copeland new_mpath = mpath; 429eb2b9311SLuis Carlos Cobo } 4304ff3a9d1SHerbert Xu 43160854fd9SBob Copeland sdata->u.mesh.mesh_paths_generation++; 43260854fd9SBob Copeland return new_mpath; 43318889231SJavier Cardona } 434eb2b9311SLuis Carlos Cobo 435bf7cd94dSJohannes Berg int mpp_path_add(struct ieee80211_sub_if_data *sdata, 436bf7cd94dSJohannes Berg const u8 *dst, const u8 *mpp) 43779617deeSYanBo { 438349eb8cfSJohannes Berg struct mesh_table *tbl; 43960854fd9SBob Copeland struct mesh_path *new_mpath; 44060854fd9SBob Copeland int ret; 44179617deeSYanBo 442b203ca39SJoe Perches if (ether_addr_equal(dst, sdata->vif.addr)) 44379617deeSYanBo /* never add ourselves as neighbours */ 44479617deeSYanBo return -ENOTSUPP; 44579617deeSYanBo 44679617deeSYanBo if (is_multicast_ether_addr(dst)) 44779617deeSYanBo return -ENOTSUPP; 44879617deeSYanBo 449b15dc38bSBob Copeland new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); 45079617deeSYanBo 45160854fd9SBob Copeland if (!new_mpath) 45260854fd9SBob Copeland return -ENOMEM; 45379617deeSYanBo 45479617deeSYanBo memcpy(new_mpath->mpp, mpp, ETH_ALEN); 455*8b5cb7e4SPavel Skripkin tbl = &sdata->u.mesh.mpp_paths; 456b4c3fbe6SHerbert Xu 457b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 45860854fd9SBob Copeland ret = rhashtable_lookup_insert_fast(&tbl->rhead, 45960854fd9SBob Copeland &new_mpath->rhash, 46060854fd9SBob Copeland mesh_rht_params); 461b4c3fbe6SHerbert Xu if (!ret) 462b4c3fbe6SHerbert Xu hlist_add_head_rcu(&new_mpath->walk_list, &tbl->walk_head); 463b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 464a2db2ed3SHenning Rogge 4654ff3a9d1SHerbert Xu if (ret) 4664ff3a9d1SHerbert Xu kfree(new_mpath); 4674ff3a9d1SHerbert Xu 4682bdaf386SBob Copeland sdata->u.mesh.mpp_paths_generation++; 46960854fd9SBob Copeland return ret; 47079617deeSYanBo } 47179617deeSYanBo 47279617deeSYanBo 473eb2b9311SLuis Carlos Cobo /** 474eb2b9311SLuis Carlos Cobo * mesh_plink_broken - deactivates paths and sends perr when a link breaks 475eb2b9311SLuis Carlos Cobo * 476eb2b9311SLuis Carlos Cobo * @sta: broken peer link 477eb2b9311SLuis Carlos Cobo * 478eb2b9311SLuis Carlos Cobo * This function must be called from the rate control algorithm if enough 479eb2b9311SLuis Carlos Cobo * delivery errors suggest that a peer link is no longer usable. 480eb2b9311SLuis Carlos Cobo */ 481eb2b9311SLuis Carlos Cobo void mesh_plink_broken(struct sta_info *sta) 482eb2b9311SLuis Carlos Cobo { 48360854fd9SBob Copeland struct ieee80211_sub_if_data *sdata = sta->sdata; 484*8b5cb7e4SPavel Skripkin struct mesh_table *tbl = &sdata->u.mesh.mesh_paths; 48515ff6365SJohannes Berg static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 486eb2b9311SLuis Carlos Cobo struct mesh_path *mpath; 487eb2b9311SLuis Carlos Cobo 488b4c3fbe6SHerbert Xu rcu_read_lock(); 489b4c3fbe6SHerbert Xu hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { 4902688eba9SAndreea-Cristina Bernat if (rcu_access_pointer(mpath->next_hop) == sta && 491eb2b9311SLuis Carlos Cobo mpath->flags & MESH_PATH_ACTIVE && 492eb2b9311SLuis Carlos Cobo !(mpath->flags & MESH_PATH_FIXED)) { 493f5e50cd0SJavier Cardona spin_lock_bh(&mpath->state_lock); 494eb2b9311SLuis Carlos Cobo mpath->flags &= ~MESH_PATH_ACTIVE; 495d19b3bf6SRui Paulo ++mpath->sn; 496eb2b9311SLuis Carlos Cobo spin_unlock_bh(&mpath->state_lock); 497bf7cd94dSJohannes Berg mesh_path_error_tx(sdata, 498bf7cd94dSJohannes Berg sdata->u.mesh.mshcfg.element_ttl, 499f63f8421SChun-Yeow Yeoh mpath->dst, mpath->sn, 500f63f8421SChun-Yeow Yeoh WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast); 501f5e50cd0SJavier Cardona } 502eb2b9311SLuis Carlos Cobo } 503b4c3fbe6SHerbert Xu rcu_read_unlock(); 504eb2b9311SLuis Carlos Cobo } 505eb2b9311SLuis Carlos Cobo 50674932959SBob Copeland static void mesh_path_free_rcu(struct mesh_table *tbl, 50774932959SBob Copeland struct mesh_path *mpath) 50819c50b3dSJavier Cardona { 50960854fd9SBob Copeland struct ieee80211_sub_if_data *sdata = mpath->sdata; 51019c50b3dSJavier Cardona 511947c2a0eSBob Copeland spin_lock_bh(&mpath->state_lock); 51274932959SBob Copeland mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED; 51319c50b3dSJavier Cardona mesh_gate_del(tbl, mpath); 514947c2a0eSBob Copeland spin_unlock_bh(&mpath->state_lock); 51574932959SBob Copeland del_timer_sync(&mpath->timer); 516c2e703a5SJohannes Berg atomic_dec(&sdata->u.mesh.mpaths); 51719c50b3dSJavier Cardona atomic_dec(&tbl->entries); 5185e43540cSRemi Pommarel mesh_path_flush_pending(mpath); 51974932959SBob Copeland kfree_rcu(mpath, rcu); 52074932959SBob Copeland } 52174932959SBob Copeland 52274932959SBob Copeland static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath) 52374932959SBob Copeland { 524b4c3fbe6SHerbert Xu hlist_del_rcu(&mpath->walk_list); 52574932959SBob Copeland rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params); 52674932959SBob Copeland mesh_path_free_rcu(tbl, mpath); 52719c50b3dSJavier Cardona } 52819c50b3dSJavier Cardona 529eb2b9311SLuis Carlos Cobo /** 530eb2b9311SLuis Carlos Cobo * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches 531eb2b9311SLuis Carlos Cobo * 5322c53040fSBen Hutchings * @sta: mesh peer to match 533eb2b9311SLuis Carlos Cobo * 534b4e08ea1SLuis Carlos Cobo * RCU notes: this function is called when a mesh plink transitions from 535b4e08ea1SLuis Carlos Cobo * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that 536b4e08ea1SLuis Carlos Cobo * allows path creation. This will happen before the sta can be freed (because 537d0709a65SJohannes Berg * sta_info_destroy() calls this) so any reader in a rcu read block will be 538d0709a65SJohannes Berg * protected against the plink disappearing. 539eb2b9311SLuis Carlos Cobo */ 540eb2b9311SLuis Carlos Cobo void mesh_path_flush_by_nexthop(struct sta_info *sta) 541eb2b9311SLuis Carlos Cobo { 5422bdaf386SBob Copeland struct ieee80211_sub_if_data *sdata = sta->sdata; 543*8b5cb7e4SPavel Skripkin struct mesh_table *tbl = &sdata->u.mesh.mesh_paths; 544eb2b9311SLuis Carlos Cobo struct mesh_path *mpath; 545b4c3fbe6SHerbert Xu struct hlist_node *n; 546eb2b9311SLuis Carlos Cobo 547b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 548b4c3fbe6SHerbert Xu hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { 54960854fd9SBob Copeland if (rcu_access_pointer(mpath->next_hop) == sta) 55060854fd9SBob Copeland __mesh_path_del(tbl, mpath); 551eb2b9311SLuis Carlos Cobo } 552b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 553eb2b9311SLuis Carlos Cobo } 554eb2b9311SLuis Carlos Cobo 555bf5a70e1SHenning Rogge static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, 556bf5a70e1SHenning Rogge const u8 *proxy) 557bf5a70e1SHenning Rogge { 558*8b5cb7e4SPavel Skripkin struct mesh_table *tbl = &sdata->u.mesh.mpp_paths; 55960854fd9SBob Copeland struct mesh_path *mpath; 560b4c3fbe6SHerbert Xu struct hlist_node *n; 561bf5a70e1SHenning Rogge 562b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 563b4c3fbe6SHerbert Xu hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { 56460854fd9SBob Copeland if (ether_addr_equal(mpath->mpp, proxy)) 56560854fd9SBob Copeland __mesh_path_del(tbl, mpath); 566bf5a70e1SHenning Rogge } 567b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 568bf5a70e1SHenning Rogge } 569bf5a70e1SHenning Rogge 57060854fd9SBob Copeland static void table_flush_by_iface(struct mesh_table *tbl) 571eb2b9311SLuis Carlos Cobo { 572eb2b9311SLuis Carlos Cobo struct mesh_path *mpath; 573b4c3fbe6SHerbert Xu struct hlist_node *n; 574eb2b9311SLuis Carlos Cobo 575b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 576b4c3fbe6SHerbert Xu hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { 57760854fd9SBob Copeland __mesh_path_del(tbl, mpath); 578eb2b9311SLuis Carlos Cobo } 579b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 580eb2b9311SLuis Carlos Cobo } 581eb2b9311SLuis Carlos Cobo 582ece1a2e7SJavier Cardona /** 583ece1a2e7SJavier Cardona * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface 584ece1a2e7SJavier Cardona * 585ece1a2e7SJavier Cardona * This function deletes both mesh paths as well as mesh portal paths. 586ece1a2e7SJavier Cardona * 5872c53040fSBen Hutchings * @sdata: interface data to match 588ece1a2e7SJavier Cardona * 589ece1a2e7SJavier Cardona */ 590ece1a2e7SJavier Cardona void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) 591eb2b9311SLuis Carlos Cobo { 592*8b5cb7e4SPavel Skripkin table_flush_by_iface(&sdata->u.mesh.mesh_paths); 593*8b5cb7e4SPavel Skripkin table_flush_by_iface(&sdata->u.mesh.mpp_paths); 594eb2b9311SLuis Carlos Cobo } 595eb2b9311SLuis Carlos Cobo 596eb2b9311SLuis Carlos Cobo /** 5974cc955deSHenning Rogge * table_path_del - delete a path from the mesh or mpp table 598eb2b9311SLuis Carlos Cobo * 5994cc955deSHenning Rogge * @tbl: mesh or mpp path table 600f698d856SJasper Bryant-Greene * @sdata: local subif 6014cc955deSHenning Rogge * @addr: dst address (ETH_ALEN length) 602eb2b9311SLuis Carlos Cobo * 603af901ca1SAndré Goddard Rosa * Returns: 0 if successful 604eb2b9311SLuis Carlos Cobo */ 60560854fd9SBob Copeland static int table_path_del(struct mesh_table *tbl, 6064cc955deSHenning Rogge struct ieee80211_sub_if_data *sdata, 6074cc955deSHenning Rogge const u8 *addr) 608eb2b9311SLuis Carlos Cobo { 609eb2b9311SLuis Carlos Cobo struct mesh_path *mpath; 610eb2b9311SLuis Carlos Cobo 611b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 61260854fd9SBob Copeland mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params); 61360854fd9SBob Copeland if (!mpath) { 614f2ffff08SWei Yongjun spin_unlock_bh(&tbl->walk_lock); 61560854fd9SBob Copeland return -ENXIO; 616eb2b9311SLuis Carlos Cobo } 617eb2b9311SLuis Carlos Cobo 61860854fd9SBob Copeland __mesh_path_del(tbl, mpath); 619b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 62060854fd9SBob Copeland return 0; 6214cc955deSHenning Rogge } 6224cc955deSHenning Rogge 62360854fd9SBob Copeland 6244cc955deSHenning Rogge /** 6254cc955deSHenning Rogge * mesh_path_del - delete a mesh path from the table 6264cc955deSHenning Rogge * 6274cc955deSHenning Rogge * @addr: dst address (ETH_ALEN length) 6284cc955deSHenning Rogge * @sdata: local subif 6294cc955deSHenning Rogge * 6304cc955deSHenning Rogge * Returns: 0 if successful 6314cc955deSHenning Rogge */ 6324cc955deSHenning Rogge int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) 6334cc955deSHenning Rogge { 63460854fd9SBob Copeland int err; 6354cc955deSHenning Rogge 6364cc955deSHenning Rogge /* flush relevant mpp entries first */ 6374cc955deSHenning Rogge mpp_flush_by_proxy(sdata, addr); 6384cc955deSHenning Rogge 639*8b5cb7e4SPavel Skripkin err = table_path_del(&sdata->u.mesh.mesh_paths, sdata, addr); 6402bdaf386SBob Copeland sdata->u.mesh.mesh_paths_generation++; 641ab1c7906SHenning Rogge return err; 642ab1c7906SHenning Rogge } 643ab1c7906SHenning Rogge 644ab1c7906SHenning Rogge /** 645eb2b9311SLuis Carlos Cobo * mesh_path_tx_pending - sends pending frames in a mesh path queue 646eb2b9311SLuis Carlos Cobo * 647eb2b9311SLuis Carlos Cobo * @mpath: mesh path to activate 648eb2b9311SLuis Carlos Cobo * 649eb2b9311SLuis Carlos Cobo * Locking: the state_lock of the mpath structure must NOT be held when calling 650eb2b9311SLuis Carlos Cobo * this function. 651eb2b9311SLuis Carlos Cobo */ 652eb2b9311SLuis Carlos Cobo void mesh_path_tx_pending(struct mesh_path *mpath) 653eb2b9311SLuis Carlos Cobo { 654249b405cSJavier Cardona if (mpath->flags & MESH_PATH_ACTIVE) 655249b405cSJavier Cardona ieee80211_add_pending_skbs(mpath->sdata->local, 656249b405cSJavier Cardona &mpath->frame_queue); 657eb2b9311SLuis Carlos Cobo } 658eb2b9311SLuis Carlos Cobo 659eb2b9311SLuis Carlos Cobo /** 6605ee68e5bSJavier Cardona * mesh_path_send_to_gates - sends pending frames to all known mesh gates 6615ee68e5bSJavier Cardona * 6625ee68e5bSJavier Cardona * @mpath: mesh path whose queue will be emptied 6635ee68e5bSJavier Cardona * 6645ee68e5bSJavier Cardona * If there is only one gate, the frames are transferred from the failed mpath 6655ee68e5bSJavier Cardona * queue to that gate's queue. If there are more than one gates, the frames 6665ee68e5bSJavier Cardona * are copied from each gate to the next. After frames are copied, the 6675ee68e5bSJavier Cardona * mpath queues are emptied onto the transmission queue. 6685ee68e5bSJavier Cardona */ 6695ee68e5bSJavier Cardona int mesh_path_send_to_gates(struct mesh_path *mpath) 6705ee68e5bSJavier Cardona { 6715ee68e5bSJavier Cardona struct ieee80211_sub_if_data *sdata = mpath->sdata; 6725ee68e5bSJavier Cardona struct mesh_table *tbl; 6735ee68e5bSJavier Cardona struct mesh_path *from_mpath = mpath; 67460854fd9SBob Copeland struct mesh_path *gate; 6755ee68e5bSJavier Cardona bool copy = false; 6765ee68e5bSJavier Cardona 677*8b5cb7e4SPavel Skripkin tbl = &sdata->u.mesh.mesh_paths; 6785ee68e5bSJavier Cardona 67960854fd9SBob Copeland rcu_read_lock(); 68018b27ff7SBob Copeland hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { 681947c2a0eSBob Copeland if (gate->flags & MESH_PATH_ACTIVE) { 682947c2a0eSBob Copeland mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst); 683947c2a0eSBob Copeland mesh_path_move_to_queue(gate, from_mpath, copy); 684947c2a0eSBob Copeland from_mpath = gate; 6855ee68e5bSJavier Cardona copy = true; 6865ee68e5bSJavier Cardona } else { 687bdcbd8e0SJohannes Berg mpath_dbg(sdata, 688d671b2a0SJohannes Berg "Not forwarding to %pM (flags %#x)\n", 689947c2a0eSBob Copeland gate->dst, gate->flags); 6905ee68e5bSJavier Cardona } 6915ee68e5bSJavier Cardona } 6925ee68e5bSJavier Cardona 69318b27ff7SBob Copeland hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { 694947c2a0eSBob Copeland mpath_dbg(sdata, "Sending to %pM\n", gate->dst); 695947c2a0eSBob Copeland mesh_path_tx_pending(gate); 6965ee68e5bSJavier Cardona } 69760854fd9SBob Copeland rcu_read_unlock(); 6985ee68e5bSJavier Cardona 6995ee68e5bSJavier Cardona return (from_mpath == mpath) ? -EHOSTUNREACH : 0; 7005ee68e5bSJavier Cardona } 7015ee68e5bSJavier Cardona 7025ee68e5bSJavier Cardona /** 703eb2b9311SLuis Carlos Cobo * mesh_path_discard_frame - discard a frame whose path could not be resolved 704eb2b9311SLuis Carlos Cobo * 705eb2b9311SLuis Carlos Cobo * @skb: frame to discard 706f698d856SJasper Bryant-Greene * @sdata: network subif the frame was to be sent through 707eb2b9311SLuis Carlos Cobo * 708eb2b9311SLuis Carlos Cobo * Locking: the function must me called within a rcu_read_lock region 709eb2b9311SLuis Carlos Cobo */ 710bf7cd94dSJohannes Berg void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, 711bf7cd94dSJohannes Berg struct sk_buff *skb) 712eb2b9311SLuis Carlos Cobo { 713eb2b9311SLuis Carlos Cobo kfree_skb(skb); 714472dbc45SJohannes Berg sdata->u.mesh.mshstats.dropped_frames_no_route++; 715eb2b9311SLuis Carlos Cobo } 716eb2b9311SLuis Carlos Cobo 717eb2b9311SLuis Carlos Cobo /** 718eb2b9311SLuis Carlos Cobo * mesh_path_flush_pending - free the pending queue of a mesh path 719eb2b9311SLuis Carlos Cobo * 720eb2b9311SLuis Carlos Cobo * @mpath: mesh path whose queue has to be freed 721eb2b9311SLuis Carlos Cobo * 72225985edcSLucas De Marchi * Locking: the function must me called within a rcu_read_lock region 723eb2b9311SLuis Carlos Cobo */ 724eb2b9311SLuis Carlos Cobo void mesh_path_flush_pending(struct mesh_path *mpath) 725eb2b9311SLuis Carlos Cobo { 726eb2b9311SLuis Carlos Cobo struct sk_buff *skb; 727eb2b9311SLuis Carlos Cobo 72800e3f25cSJavier Cardona while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) 729bf7cd94dSJohannes Berg mesh_path_discard_frame(mpath->sdata, skb); 730eb2b9311SLuis Carlos Cobo } 731eb2b9311SLuis Carlos Cobo 732eb2b9311SLuis Carlos Cobo /** 733eb2b9311SLuis Carlos Cobo * mesh_path_fix_nexthop - force a specific next hop for a mesh path 734eb2b9311SLuis Carlos Cobo * 735eb2b9311SLuis Carlos Cobo * @mpath: the mesh path to modify 736eb2b9311SLuis Carlos Cobo * @next_hop: the next hop to force 737eb2b9311SLuis Carlos Cobo * 738eb2b9311SLuis Carlos Cobo * Locking: this function must be called holding mpath->state_lock 739eb2b9311SLuis Carlos Cobo */ 740eb2b9311SLuis Carlos Cobo void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) 741eb2b9311SLuis Carlos Cobo { 742eb2b9311SLuis Carlos Cobo spin_lock_bh(&mpath->state_lock); 743eb2b9311SLuis Carlos Cobo mesh_path_assign_nexthop(mpath, next_hop); 744d19b3bf6SRui Paulo mpath->sn = 0xffff; 745eb2b9311SLuis Carlos Cobo mpath->metric = 0; 746eb2b9311SLuis Carlos Cobo mpath->hop_count = 0; 747eb2b9311SLuis Carlos Cobo mpath->exp_time = 0; 7485df20f21SPedersen, Thomas mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID; 749eb2b9311SLuis Carlos Cobo mesh_path_activate(mpath); 750eb2b9311SLuis Carlos Cobo spin_unlock_bh(&mpath->state_lock); 7513eb0928fSManoharan, Rajkumar ewma_mesh_fail_avg_init(&next_hop->mesh->fail_avg); 7523eb0928fSManoharan, Rajkumar /* init it at a low value - 0 start is tricky */ 7533eb0928fSManoharan, Rajkumar ewma_mesh_fail_avg_add(&next_hop->mesh->fail_avg, 1); 754eb2b9311SLuis Carlos Cobo mesh_path_tx_pending(mpath); 755eb2b9311SLuis Carlos Cobo } 756eb2b9311SLuis Carlos Cobo 757*8b5cb7e4SPavel Skripkin void mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata) 758eb2b9311SLuis Carlos Cobo { 759*8b5cb7e4SPavel Skripkin mesh_table_init(&sdata->u.mesh.mesh_paths); 760*8b5cb7e4SPavel Skripkin mesh_table_init(&sdata->u.mesh.mpp_paths); 761eb2b9311SLuis Carlos Cobo } 762eb2b9311SLuis Carlos Cobo 76360854fd9SBob Copeland static 76460854fd9SBob Copeland void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata, 76560854fd9SBob Copeland struct mesh_table *tbl) 76660854fd9SBob Copeland { 76760854fd9SBob Copeland struct mesh_path *mpath; 768b4c3fbe6SHerbert Xu struct hlist_node *n; 76960854fd9SBob Copeland 770b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 771b4c3fbe6SHerbert Xu hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { 77260854fd9SBob Copeland if ((!(mpath->flags & MESH_PATH_RESOLVING)) && 77360854fd9SBob Copeland (!(mpath->flags & MESH_PATH_FIXED)) && 77460854fd9SBob Copeland time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) 77560854fd9SBob Copeland __mesh_path_del(tbl, mpath); 77660854fd9SBob Copeland } 777b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 77860854fd9SBob Copeland } 77960854fd9SBob Copeland 780f698d856SJasper Bryant-Greene void mesh_path_expire(struct ieee80211_sub_if_data *sdata) 781eb2b9311SLuis Carlos Cobo { 782*8b5cb7e4SPavel Skripkin mesh_path_tbl_expire(sdata, &sdata->u.mesh.mesh_paths); 783*8b5cb7e4SPavel Skripkin mesh_path_tbl_expire(sdata, &sdata->u.mesh.mpp_paths); 784eb2b9311SLuis Carlos Cobo } 785eb2b9311SLuis Carlos Cobo 7862bdaf386SBob Copeland void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata) 787eb2b9311SLuis Carlos Cobo { 788*8b5cb7e4SPavel Skripkin mesh_table_free(&sdata->u.mesh.mesh_paths); 789*8b5cb7e4SPavel Skripkin mesh_table_free(&sdata->u.mesh.mpp_paths); 790eb2b9311SLuis Carlos Cobo } 791