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 5060854fd9SBob Copeland static struct mesh_table *mesh_table_alloc(void) 51349eb8cfSJohannes Berg { 526b86bd62SJohannes Berg struct mesh_table *newtbl; 536b86bd62SJohannes Berg 54d676ff49SJavier Cardona newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC); 556b86bd62SJohannes Berg if (!newtbl) 566b86bd62SJohannes Berg return NULL; 576b86bd62SJohannes Berg 5818b27ff7SBob Copeland INIT_HLIST_HEAD(&newtbl->known_gates); 59b4c3fbe6SHerbert Xu INIT_HLIST_HEAD(&newtbl->walk_head); 606b86bd62SJohannes Berg atomic_set(&newtbl->entries, 0); 615ee68e5bSJavier Cardona spin_lock_init(&newtbl->gates_lock); 62b4c3fbe6SHerbert Xu spin_lock_init(&newtbl->walk_lock); 636b86bd62SJohannes Berg 646b86bd62SJohannes Berg return newtbl; 656b86bd62SJohannes Berg } 666b86bd62SJohannes Berg 6760854fd9SBob Copeland static void mesh_table_free(struct mesh_table *tbl) 6818889231SJavier Cardona { 6960854fd9SBob Copeland rhashtable_free_and_destroy(&tbl->rhead, 7074932959SBob Copeland mesh_path_rht_free, tbl); 7118889231SJavier Cardona kfree(tbl); 7218889231SJavier Cardona } 7318889231SJavier Cardona 74eb2b9311SLuis Carlos Cobo /** 75eb2b9311SLuis Carlos Cobo * 76eb2b9311SLuis Carlos Cobo * mesh_path_assign_nexthop - update mesh path next hop 77eb2b9311SLuis Carlos Cobo * 78eb2b9311SLuis Carlos Cobo * @mpath: mesh path to update 79eb2b9311SLuis Carlos Cobo * @sta: next hop to assign 80eb2b9311SLuis Carlos Cobo * 81eb2b9311SLuis Carlos Cobo * Locking: mpath->state_lock must be held when calling this function 82eb2b9311SLuis Carlos Cobo */ 83eb2b9311SLuis Carlos Cobo void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) 84eb2b9311SLuis Carlos Cobo { 8510c836d7SJavier Cardona struct sk_buff *skb; 8610c836d7SJavier Cardona struct ieee80211_hdr *hdr; 8710c836d7SJavier Cardona unsigned long flags; 8810c836d7SJavier Cardona 89d0709a65SJohannes Berg rcu_assign_pointer(mpath->next_hop, sta); 9010c836d7SJavier Cardona 9110c836d7SJavier Cardona spin_lock_irqsave(&mpath->frame_queue.lock, flags); 92b22bd522SThomas Pedersen skb_queue_walk(&mpath->frame_queue, skb) { 9310c836d7SJavier Cardona hdr = (struct ieee80211_hdr *) skb->data; 9410c836d7SJavier Cardona memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 957e3c8866SThomas Pedersen memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); 963f52b7e3SMarco Porsch ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); 9710c836d7SJavier Cardona } 9810c836d7SJavier Cardona 9910c836d7SJavier Cardona spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); 100eb2b9311SLuis Carlos Cobo } 101eb2b9311SLuis Carlos Cobo 1025ee68e5bSJavier Cardona static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, 1035ee68e5bSJavier Cardona struct mesh_path *gate_mpath) 1045ee68e5bSJavier Cardona { 1055ee68e5bSJavier Cardona struct ieee80211_hdr *hdr; 1065ee68e5bSJavier Cardona struct ieee80211s_hdr *mshdr; 1075ee68e5bSJavier Cardona int mesh_hdrlen, hdrlen; 1085ee68e5bSJavier Cardona char *next_hop; 1095ee68e5bSJavier Cardona 1105ee68e5bSJavier Cardona hdr = (struct ieee80211_hdr *) skb->data; 1115ee68e5bSJavier Cardona hdrlen = ieee80211_hdrlen(hdr->frame_control); 1125ee68e5bSJavier Cardona mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 1135ee68e5bSJavier Cardona 1145ee68e5bSJavier Cardona if (!(mshdr->flags & MESH_FLAGS_AE)) { 1155ee68e5bSJavier Cardona /* size of the fixed part of the mesh header */ 1165ee68e5bSJavier Cardona mesh_hdrlen = 6; 1175ee68e5bSJavier Cardona 1185ee68e5bSJavier Cardona /* make room for the two extended addresses */ 1195ee68e5bSJavier Cardona skb_push(skb, 2 * ETH_ALEN); 1205ee68e5bSJavier Cardona memmove(skb->data, hdr, hdrlen + mesh_hdrlen); 1215ee68e5bSJavier Cardona 1225ee68e5bSJavier Cardona hdr = (struct ieee80211_hdr *) skb->data; 1235ee68e5bSJavier Cardona 1245ee68e5bSJavier Cardona /* we preserve the previous mesh header and only add 1255ee68e5bSJavier Cardona * the new addreses */ 1265ee68e5bSJavier Cardona mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); 1275ee68e5bSJavier Cardona mshdr->flags = MESH_FLAGS_AE_A5_A6; 1285ee68e5bSJavier Cardona memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); 1295ee68e5bSJavier Cardona memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); 1305ee68e5bSJavier Cardona } 1315ee68e5bSJavier Cardona 1325ee68e5bSJavier Cardona /* update next hop */ 1335ee68e5bSJavier Cardona hdr = (struct ieee80211_hdr *) skb->data; 1345ee68e5bSJavier Cardona rcu_read_lock(); 1355ee68e5bSJavier Cardona next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; 1365ee68e5bSJavier Cardona memcpy(hdr->addr1, next_hop, ETH_ALEN); 1375ee68e5bSJavier Cardona rcu_read_unlock(); 1387e3c8866SThomas Pedersen memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); 1395ee68e5bSJavier Cardona memcpy(hdr->addr3, dst_addr, ETH_ALEN); 1405ee68e5bSJavier Cardona } 1415ee68e5bSJavier Cardona 1425ee68e5bSJavier Cardona /** 1435ee68e5bSJavier Cardona * 1445ee68e5bSJavier Cardona * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another 1455ee68e5bSJavier Cardona * 1465ee68e5bSJavier Cardona * This function is used to transfer or copy frames from an unresolved mpath to 1475ee68e5bSJavier Cardona * a gate mpath. The function also adds the Address Extension field and 1485ee68e5bSJavier Cardona * updates the next hop. 1495ee68e5bSJavier Cardona * 1505ee68e5bSJavier Cardona * If a frame already has an Address Extension field, only the next hop and 1515ee68e5bSJavier Cardona * destination addresses are updated. 1525ee68e5bSJavier Cardona * 1535ee68e5bSJavier Cardona * The gate mpath must be an active mpath with a valid mpath->next_hop. 1545ee68e5bSJavier Cardona * 1555ee68e5bSJavier Cardona * @mpath: An active mpath the frames will be sent to (i.e. the gate) 1565ee68e5bSJavier Cardona * @from_mpath: The failed mpath 1575ee68e5bSJavier Cardona * @copy: When true, copy all the frames to the new mpath queue. When false, 1585ee68e5bSJavier Cardona * move them. 1595ee68e5bSJavier Cardona */ 1605ee68e5bSJavier Cardona static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, 1615ee68e5bSJavier Cardona struct mesh_path *from_mpath, 1625ee68e5bSJavier Cardona bool copy) 1635ee68e5bSJavier Cardona { 1644bd4c2ddSThomas Pedersen struct sk_buff *skb, *fskb, *tmp; 1654bd4c2ddSThomas Pedersen struct sk_buff_head failq; 1665ee68e5bSJavier Cardona unsigned long flags; 1675ee68e5bSJavier Cardona 1688c5bb1faSJohannes Berg if (WARN_ON(gate_mpath == from_mpath)) 1698c5bb1faSJohannes Berg return; 1708c5bb1faSJohannes Berg if (WARN_ON(!gate_mpath->next_hop)) 1718c5bb1faSJohannes Berg return; 1725ee68e5bSJavier Cardona 1735ee68e5bSJavier Cardona __skb_queue_head_init(&failq); 1745ee68e5bSJavier Cardona 1755ee68e5bSJavier Cardona spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); 1765ee68e5bSJavier Cardona skb_queue_splice_init(&from_mpath->frame_queue, &failq); 1775ee68e5bSJavier Cardona spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); 1785ee68e5bSJavier Cardona 1794bd4c2ddSThomas Pedersen skb_queue_walk_safe(&failq, fskb, tmp) { 1804bd4c2ddSThomas Pedersen if (skb_queue_len(&gate_mpath->frame_queue) >= 1814bd4c2ddSThomas Pedersen MESH_FRAME_QUEUE_LEN) { 1824bd4c2ddSThomas Pedersen mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); 1834bd4c2ddSThomas Pedersen break; 184817a53d9SJohn W. Linville } 1855ee68e5bSJavier Cardona 1864bd4c2ddSThomas Pedersen skb = skb_copy(fskb, GFP_ATOMIC); 1874bd4c2ddSThomas Pedersen if (WARN_ON(!skb)) 1884bd4c2ddSThomas Pedersen break; 1894bd4c2ddSThomas Pedersen 1905ee68e5bSJavier Cardona prepare_for_gate(skb, gate_mpath->dst, gate_mpath); 1914bd4c2ddSThomas Pedersen skb_queue_tail(&gate_mpath->frame_queue, skb); 1924bd4c2ddSThomas Pedersen 1934bd4c2ddSThomas Pedersen if (copy) 1944bd4c2ddSThomas Pedersen continue; 1954bd4c2ddSThomas Pedersen 1964bd4c2ddSThomas Pedersen __skb_unlink(fskb, &failq); 1974bd4c2ddSThomas Pedersen kfree_skb(fskb); 1985ee68e5bSJavier Cardona } 1995ee68e5bSJavier Cardona 200bdcbd8e0SJohannes Berg mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", 201bdcbd8e0SJohannes Berg gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); 2025ee68e5bSJavier Cardona 2035ee68e5bSJavier Cardona if (!copy) 2045ee68e5bSJavier Cardona return; 2055ee68e5bSJavier Cardona 2065ee68e5bSJavier Cardona spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); 2075ee68e5bSJavier Cardona skb_queue_splice(&failq, &from_mpath->frame_queue); 2085ee68e5bSJavier Cardona spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); 2095ee68e5bSJavier Cardona } 2105ee68e5bSJavier Cardona 211eb2b9311SLuis Carlos Cobo 2124a3cb702SJohannes Berg static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, 213239289e4SJavier Cardona struct ieee80211_sub_if_data *sdata) 214239289e4SJavier Cardona { 215239289e4SJavier Cardona struct mesh_path *mpath; 216239289e4SJavier Cardona 217ef618b1bSFelix Fietkau mpath = rhashtable_lookup(&tbl->rhead, dst, mesh_rht_params); 21860854fd9SBob Copeland 21960854fd9SBob Copeland if (mpath && mpath_expired(mpath)) { 220239289e4SJavier Cardona spin_lock_bh(&mpath->state_lock); 221239289e4SJavier Cardona mpath->flags &= ~MESH_PATH_ACTIVE; 222239289e4SJavier Cardona spin_unlock_bh(&mpath->state_lock); 223239289e4SJavier Cardona } 224239289e4SJavier Cardona return mpath; 225239289e4SJavier Cardona } 226239289e4SJavier Cardona 227eb2b9311SLuis Carlos Cobo /** 228eb2b9311SLuis Carlos Cobo * mesh_path_lookup - look up a path in the mesh path table 229f698d856SJasper Bryant-Greene * @sdata: local subif 230bf7cd94dSJohannes Berg * @dst: hardware address (ETH_ALEN length) of destination 231eb2b9311SLuis Carlos Cobo * 232eb2b9311SLuis Carlos Cobo * Returns: pointer to the mesh path structure, or NULL if not found 233eb2b9311SLuis Carlos Cobo * 234eb2b9311SLuis Carlos Cobo * Locking: must be called within a read rcu section. 235eb2b9311SLuis Carlos Cobo */ 236bf7cd94dSJohannes Berg struct mesh_path * 237bf7cd94dSJohannes Berg mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) 238eb2b9311SLuis Carlos Cobo { 23960854fd9SBob Copeland return mpath_lookup(sdata->u.mesh.mesh_paths, dst, sdata); 240eb2b9311SLuis Carlos Cobo } 241eb2b9311SLuis Carlos Cobo 242bf7cd94dSJohannes Berg struct mesh_path * 243bf7cd94dSJohannes Berg mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) 24479617deeSYanBo { 24560854fd9SBob Copeland return mpath_lookup(sdata->u.mesh.mpp_paths, dst, sdata); 24679617deeSYanBo } 24779617deeSYanBo 24860854fd9SBob Copeland static struct mesh_path * 24960854fd9SBob Copeland __mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx) 25060854fd9SBob Copeland { 251b4c3fbe6SHerbert Xu int i = 0; 252b4c3fbe6SHerbert Xu struct mesh_path *mpath; 25360854fd9SBob Copeland 254b4c3fbe6SHerbert Xu hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { 25560854fd9SBob Copeland if (i++ == idx) 25660854fd9SBob Copeland break; 25760854fd9SBob Copeland } 25860854fd9SBob Copeland 259b4c3fbe6SHerbert Xu if (!mpath) 26060854fd9SBob Copeland return NULL; 26160854fd9SBob Copeland 26260854fd9SBob Copeland if (mpath_expired(mpath)) { 26360854fd9SBob Copeland spin_lock_bh(&mpath->state_lock); 26460854fd9SBob Copeland mpath->flags &= ~MESH_PATH_ACTIVE; 26560854fd9SBob Copeland spin_unlock_bh(&mpath->state_lock); 26660854fd9SBob Copeland } 26760854fd9SBob Copeland return mpath; 26860854fd9SBob Copeland } 26979617deeSYanBo 270eb2b9311SLuis Carlos Cobo /** 271eb2b9311SLuis Carlos Cobo * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index 272eb2b9311SLuis Carlos Cobo * @idx: index 273f698d856SJasper Bryant-Greene * @sdata: local subif, or NULL for all entries 274eb2b9311SLuis Carlos Cobo * 275eb2b9311SLuis Carlos Cobo * Returns: pointer to the mesh path structure, or NULL if not found. 276eb2b9311SLuis Carlos Cobo * 277eb2b9311SLuis Carlos Cobo * Locking: must be called within a read rcu section. 278eb2b9311SLuis Carlos Cobo */ 279bf7cd94dSJohannes Berg struct mesh_path * 280bf7cd94dSJohannes Berg mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) 281eb2b9311SLuis Carlos Cobo { 28260854fd9SBob Copeland return __mesh_path_lookup_by_idx(sdata->u.mesh.mesh_paths, idx); 283eb2b9311SLuis Carlos Cobo } 284eb2b9311SLuis Carlos Cobo 2855ee68e5bSJavier Cardona /** 286a2db2ed3SHenning Rogge * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index 287a2db2ed3SHenning Rogge * @idx: index 288a2db2ed3SHenning Rogge * @sdata: local subif, or NULL for all entries 289a2db2ed3SHenning Rogge * 290a2db2ed3SHenning Rogge * Returns: pointer to the proxy path structure, or NULL if not found. 291a2db2ed3SHenning Rogge * 292a2db2ed3SHenning Rogge * Locking: must be called within a read rcu section. 293a2db2ed3SHenning Rogge */ 294a2db2ed3SHenning Rogge struct mesh_path * 295a2db2ed3SHenning Rogge mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) 296a2db2ed3SHenning Rogge { 29760854fd9SBob Copeland return __mesh_path_lookup_by_idx(sdata->u.mesh.mpp_paths, idx); 298a2db2ed3SHenning Rogge } 299a2db2ed3SHenning Rogge 300a2db2ed3SHenning Rogge /** 30130be52e4SJohannes Berg * mesh_path_add_gate - add the given mpath to a mesh gate to our path table 30230be52e4SJohannes Berg * @mpath: gate path to add to table 3035ee68e5bSJavier Cardona */ 30430be52e4SJohannes Berg int mesh_path_add_gate(struct mesh_path *mpath) 3055ee68e5bSJavier Cardona { 30630be52e4SJohannes Berg struct mesh_table *tbl; 3075ee68e5bSJavier Cardona int err; 3085ee68e5bSJavier Cardona 3095ee68e5bSJavier Cardona rcu_read_lock(); 31060854fd9SBob Copeland tbl = mpath->sdata->u.mesh.mesh_paths; 3115ee68e5bSJavier Cardona 312947c2a0eSBob Copeland spin_lock_bh(&mpath->state_lock); 313947c2a0eSBob Copeland if (mpath->is_gate) { 3145ee68e5bSJavier Cardona err = -EEXIST; 315947c2a0eSBob Copeland spin_unlock_bh(&mpath->state_lock); 3165ee68e5bSJavier Cardona goto err_rcu; 3175ee68e5bSJavier Cardona } 3185ee68e5bSJavier Cardona mpath->is_gate = true; 3195ee68e5bSJavier Cardona mpath->sdata->u.mesh.num_gates++; 320947c2a0eSBob Copeland 321947c2a0eSBob Copeland spin_lock(&tbl->gates_lock); 32218b27ff7SBob Copeland hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates); 323947c2a0eSBob Copeland spin_unlock(&tbl->gates_lock); 324947c2a0eSBob Copeland 325947c2a0eSBob Copeland spin_unlock_bh(&mpath->state_lock); 326947c2a0eSBob Copeland 327bdcbd8e0SJohannes Berg mpath_dbg(mpath->sdata, 328bdcbd8e0SJohannes Berg "Mesh path: Recorded new gate: %pM. %d known gates\n", 329bdcbd8e0SJohannes Berg mpath->dst, mpath->sdata->u.mesh.num_gates); 330bf7cd94dSJohannes Berg err = 0; 3315ee68e5bSJavier Cardona err_rcu: 3325ee68e5bSJavier Cardona rcu_read_unlock(); 3335ee68e5bSJavier Cardona return err; 3345ee68e5bSJavier Cardona } 3355ee68e5bSJavier Cardona 3365ee68e5bSJavier Cardona /** 3375ee68e5bSJavier Cardona * mesh_gate_del - remove a mesh gate from the list of known gates 3385ee68e5bSJavier Cardona * @tbl: table which holds our list of known gates 3395ee68e5bSJavier Cardona * @mpath: gate mpath 3405ee68e5bSJavier Cardona */ 341bf7cd94dSJohannes Berg static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) 3425ee68e5bSJavier Cardona { 343947c2a0eSBob Copeland lockdep_assert_held(&mpath->state_lock); 344947c2a0eSBob Copeland if (!mpath->is_gate) 345947c2a0eSBob Copeland return; 3465ee68e5bSJavier Cardona 3475ee68e5bSJavier Cardona mpath->is_gate = false; 348947c2a0eSBob Copeland spin_lock_bh(&tbl->gates_lock); 349947c2a0eSBob Copeland hlist_del_rcu(&mpath->gate_list); 350947c2a0eSBob Copeland mpath->sdata->u.mesh.num_gates--; 351947c2a0eSBob Copeland spin_unlock_bh(&tbl->gates_lock); 352947c2a0eSBob Copeland 353bdcbd8e0SJohannes Berg mpath_dbg(mpath->sdata, 354bdcbd8e0SJohannes Berg "Mesh path: Deleted gate: %pM. %d known gates\n", 3555ee68e5bSJavier Cardona mpath->dst, mpath->sdata->u.mesh.num_gates); 3565ee68e5bSJavier Cardona } 3575ee68e5bSJavier Cardona 3585ee68e5bSJavier Cardona /** 3595ee68e5bSJavier Cardona * mesh_gate_num - number of gates known to this interface 3605ee68e5bSJavier Cardona * @sdata: subif data 3615ee68e5bSJavier Cardona */ 3625ee68e5bSJavier Cardona int mesh_gate_num(struct ieee80211_sub_if_data *sdata) 3635ee68e5bSJavier Cardona { 3645ee68e5bSJavier Cardona return sdata->u.mesh.num_gates; 3655ee68e5bSJavier Cardona } 3665ee68e5bSJavier Cardona 367b15dc38bSBob Copeland static 368b15dc38bSBob Copeland struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata, 369b15dc38bSBob Copeland const u8 *dst, gfp_t gfp_flags) 370b15dc38bSBob Copeland { 371b15dc38bSBob Copeland struct mesh_path *new_mpath; 372b15dc38bSBob Copeland 373b15dc38bSBob Copeland new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags); 374b15dc38bSBob Copeland if (!new_mpath) 375b15dc38bSBob Copeland return NULL; 376b15dc38bSBob Copeland 377b15dc38bSBob Copeland memcpy(new_mpath->dst, dst, ETH_ALEN); 378b15dc38bSBob Copeland eth_broadcast_addr(new_mpath->rann_snd_addr); 379b15dc38bSBob Copeland new_mpath->is_root = false; 380b15dc38bSBob Copeland new_mpath->sdata = sdata; 381b15dc38bSBob Copeland new_mpath->flags = 0; 382b15dc38bSBob Copeland skb_queue_head_init(&new_mpath->frame_queue); 383b15dc38bSBob Copeland new_mpath->exp_time = jiffies; 384b15dc38bSBob Copeland spin_lock_init(&new_mpath->state_lock); 38534f11cd3SKees Cook timer_setup(&new_mpath->timer, mesh_path_timer, 0); 386b15dc38bSBob Copeland 387b15dc38bSBob Copeland return new_mpath; 388b15dc38bSBob Copeland } 389b15dc38bSBob Copeland 390eb2b9311SLuis Carlos Cobo /** 391eb2b9311SLuis Carlos Cobo * mesh_path_add - allocate and add a new path to the mesh path table 392bf7cd94dSJohannes Berg * @dst: destination address of the path (ETH_ALEN length) 393f698d856SJasper Bryant-Greene * @sdata: local subif 394eb2b9311SLuis Carlos Cobo * 395af901ca1SAndré Goddard Rosa * Returns: 0 on success 396eb2b9311SLuis Carlos Cobo * 397eb2b9311SLuis Carlos Cobo * State: the initial state of the new path is set to 0 398eb2b9311SLuis Carlos Cobo */ 399ae76eef0SBob Copeland struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, 400ae76eef0SBob Copeland const u8 *dst) 401eb2b9311SLuis Carlos Cobo { 402349eb8cfSJohannes Berg struct mesh_table *tbl; 403eb2b9311SLuis Carlos Cobo struct mesh_path *mpath, *new_mpath; 404eb2b9311SLuis Carlos Cobo 405b203ca39SJoe Perches if (ether_addr_equal(dst, sdata->vif.addr)) 406eb2b9311SLuis Carlos Cobo /* never add ourselves as neighbours */ 407ae76eef0SBob Copeland return ERR_PTR(-ENOTSUPP); 408eb2b9311SLuis Carlos Cobo 409eb2b9311SLuis Carlos Cobo if (is_multicast_ether_addr(dst)) 410ae76eef0SBob Copeland return ERR_PTR(-ENOTSUPP); 411eb2b9311SLuis Carlos Cobo 412472dbc45SJohannes Berg if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) 413ae76eef0SBob Copeland return ERR_PTR(-ENOSPC); 414ae76eef0SBob Copeland 415b15dc38bSBob Copeland new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); 416402d7752SPavel Emelyanov if (!new_mpath) 41760854fd9SBob Copeland return ERR_PTR(-ENOMEM); 418402d7752SPavel Emelyanov 41960854fd9SBob Copeland tbl = sdata->u.mesh.mesh_paths; 420b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 42136922931SHerbert Xu mpath = rhashtable_lookup_get_insert_fast(&tbl->rhead, 42260854fd9SBob Copeland &new_mpath->rhash, 42360854fd9SBob Copeland mesh_rht_params); 42436922931SHerbert Xu if (!mpath) 425b4c3fbe6SHerbert Xu hlist_add_head(&new_mpath->walk_list, &tbl->walk_head); 426b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 427f5ea9120SJohannes Berg 42836922931SHerbert Xu if (mpath) { 4294ff3a9d1SHerbert Xu kfree(new_mpath); 4304ff3a9d1SHerbert Xu 43136922931SHerbert Xu if (IS_ERR(mpath)) 43236922931SHerbert Xu return mpath; 433ae76eef0SBob Copeland 43460854fd9SBob Copeland new_mpath = mpath; 435eb2b9311SLuis Carlos Cobo } 4364ff3a9d1SHerbert Xu 43760854fd9SBob Copeland sdata->u.mesh.mesh_paths_generation++; 43860854fd9SBob Copeland return new_mpath; 43918889231SJavier Cardona } 440eb2b9311SLuis Carlos Cobo 441bf7cd94dSJohannes Berg int mpp_path_add(struct ieee80211_sub_if_data *sdata, 442bf7cd94dSJohannes Berg const u8 *dst, const u8 *mpp) 44379617deeSYanBo { 444349eb8cfSJohannes Berg struct mesh_table *tbl; 44560854fd9SBob Copeland struct mesh_path *new_mpath; 44660854fd9SBob Copeland int ret; 44779617deeSYanBo 448b203ca39SJoe Perches if (ether_addr_equal(dst, sdata->vif.addr)) 44979617deeSYanBo /* never add ourselves as neighbours */ 45079617deeSYanBo return -ENOTSUPP; 45179617deeSYanBo 45279617deeSYanBo if (is_multicast_ether_addr(dst)) 45379617deeSYanBo return -ENOTSUPP; 45479617deeSYanBo 455b15dc38bSBob Copeland new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); 45679617deeSYanBo 45760854fd9SBob Copeland if (!new_mpath) 45860854fd9SBob Copeland return -ENOMEM; 45979617deeSYanBo 46079617deeSYanBo memcpy(new_mpath->mpp, mpp, ETH_ALEN); 46160854fd9SBob Copeland tbl = sdata->u.mesh.mpp_paths; 462b4c3fbe6SHerbert Xu 463b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 46460854fd9SBob Copeland ret = rhashtable_lookup_insert_fast(&tbl->rhead, 46560854fd9SBob Copeland &new_mpath->rhash, 46660854fd9SBob Copeland mesh_rht_params); 467b4c3fbe6SHerbert Xu if (!ret) 468b4c3fbe6SHerbert Xu hlist_add_head_rcu(&new_mpath->walk_list, &tbl->walk_head); 469b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 470a2db2ed3SHenning Rogge 4714ff3a9d1SHerbert Xu if (ret) 4724ff3a9d1SHerbert Xu kfree(new_mpath); 4734ff3a9d1SHerbert Xu 4742bdaf386SBob Copeland sdata->u.mesh.mpp_paths_generation++; 47560854fd9SBob Copeland return ret; 47679617deeSYanBo } 47779617deeSYanBo 47879617deeSYanBo 479eb2b9311SLuis Carlos Cobo /** 480eb2b9311SLuis Carlos Cobo * mesh_plink_broken - deactivates paths and sends perr when a link breaks 481eb2b9311SLuis Carlos Cobo * 482eb2b9311SLuis Carlos Cobo * @sta: broken peer link 483eb2b9311SLuis Carlos Cobo * 484eb2b9311SLuis Carlos Cobo * This function must be called from the rate control algorithm if enough 485eb2b9311SLuis Carlos Cobo * delivery errors suggest that a peer link is no longer usable. 486eb2b9311SLuis Carlos Cobo */ 487eb2b9311SLuis Carlos Cobo void mesh_plink_broken(struct sta_info *sta) 488eb2b9311SLuis Carlos Cobo { 48960854fd9SBob Copeland struct ieee80211_sub_if_data *sdata = sta->sdata; 49060854fd9SBob Copeland struct mesh_table *tbl = sdata->u.mesh.mesh_paths; 49115ff6365SJohannes Berg static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; 492eb2b9311SLuis Carlos Cobo struct mesh_path *mpath; 493eb2b9311SLuis Carlos Cobo 494b4c3fbe6SHerbert Xu rcu_read_lock(); 495b4c3fbe6SHerbert Xu hlist_for_each_entry_rcu(mpath, &tbl->walk_head, walk_list) { 4962688eba9SAndreea-Cristina Bernat if (rcu_access_pointer(mpath->next_hop) == sta && 497eb2b9311SLuis Carlos Cobo mpath->flags & MESH_PATH_ACTIVE && 498eb2b9311SLuis Carlos Cobo !(mpath->flags & MESH_PATH_FIXED)) { 499f5e50cd0SJavier Cardona spin_lock_bh(&mpath->state_lock); 500eb2b9311SLuis Carlos Cobo mpath->flags &= ~MESH_PATH_ACTIVE; 501d19b3bf6SRui Paulo ++mpath->sn; 502eb2b9311SLuis Carlos Cobo spin_unlock_bh(&mpath->state_lock); 503bf7cd94dSJohannes Berg mesh_path_error_tx(sdata, 504bf7cd94dSJohannes Berg sdata->u.mesh.mshcfg.element_ttl, 505f63f8421SChun-Yeow Yeoh mpath->dst, mpath->sn, 506f63f8421SChun-Yeow Yeoh WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast); 507f5e50cd0SJavier Cardona } 508eb2b9311SLuis Carlos Cobo } 509b4c3fbe6SHerbert Xu rcu_read_unlock(); 510eb2b9311SLuis Carlos Cobo } 511eb2b9311SLuis Carlos Cobo 51274932959SBob Copeland static void mesh_path_free_rcu(struct mesh_table *tbl, 51374932959SBob Copeland struct mesh_path *mpath) 51419c50b3dSJavier Cardona { 51560854fd9SBob Copeland struct ieee80211_sub_if_data *sdata = mpath->sdata; 51619c50b3dSJavier Cardona 517947c2a0eSBob Copeland spin_lock_bh(&mpath->state_lock); 51874932959SBob Copeland mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED; 51919c50b3dSJavier Cardona mesh_gate_del(tbl, mpath); 520947c2a0eSBob Copeland spin_unlock_bh(&mpath->state_lock); 52174932959SBob Copeland del_timer_sync(&mpath->timer); 522c2e703a5SJohannes Berg atomic_dec(&sdata->u.mesh.mpaths); 52319c50b3dSJavier Cardona atomic_dec(&tbl->entries); 5245e43540cSRemi Pommarel mesh_path_flush_pending(mpath); 52574932959SBob Copeland kfree_rcu(mpath, rcu); 52674932959SBob Copeland } 52774932959SBob Copeland 52874932959SBob Copeland static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath) 52974932959SBob Copeland { 530b4c3fbe6SHerbert Xu hlist_del_rcu(&mpath->walk_list); 53174932959SBob Copeland rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params); 53274932959SBob Copeland mesh_path_free_rcu(tbl, mpath); 53319c50b3dSJavier Cardona } 53419c50b3dSJavier Cardona 535eb2b9311SLuis Carlos Cobo /** 536eb2b9311SLuis Carlos Cobo * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches 537eb2b9311SLuis Carlos Cobo * 5382c53040fSBen Hutchings * @sta: mesh peer to match 539eb2b9311SLuis Carlos Cobo * 540b4e08ea1SLuis Carlos Cobo * RCU notes: this function is called when a mesh plink transitions from 541b4e08ea1SLuis Carlos Cobo * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that 542b4e08ea1SLuis Carlos Cobo * allows path creation. This will happen before the sta can be freed (because 543d0709a65SJohannes Berg * sta_info_destroy() calls this) so any reader in a rcu read block will be 544d0709a65SJohannes Berg * protected against the plink disappearing. 545eb2b9311SLuis Carlos Cobo */ 546eb2b9311SLuis Carlos Cobo void mesh_path_flush_by_nexthop(struct sta_info *sta) 547eb2b9311SLuis Carlos Cobo { 5482bdaf386SBob Copeland struct ieee80211_sub_if_data *sdata = sta->sdata; 54960854fd9SBob Copeland struct mesh_table *tbl = sdata->u.mesh.mesh_paths; 550eb2b9311SLuis Carlos Cobo struct mesh_path *mpath; 551b4c3fbe6SHerbert Xu struct hlist_node *n; 552eb2b9311SLuis Carlos Cobo 553b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 554b4c3fbe6SHerbert Xu hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { 55560854fd9SBob Copeland if (rcu_access_pointer(mpath->next_hop) == sta) 55660854fd9SBob Copeland __mesh_path_del(tbl, mpath); 557eb2b9311SLuis Carlos Cobo } 558b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 559eb2b9311SLuis Carlos Cobo } 560eb2b9311SLuis Carlos Cobo 561bf5a70e1SHenning Rogge static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, 562bf5a70e1SHenning Rogge const u8 *proxy) 563bf5a70e1SHenning Rogge { 56460854fd9SBob Copeland struct mesh_table *tbl = sdata->u.mesh.mpp_paths; 56560854fd9SBob Copeland struct mesh_path *mpath; 566b4c3fbe6SHerbert Xu struct hlist_node *n; 567bf5a70e1SHenning Rogge 568b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 569b4c3fbe6SHerbert Xu hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { 57060854fd9SBob Copeland if (ether_addr_equal(mpath->mpp, proxy)) 57160854fd9SBob Copeland __mesh_path_del(tbl, mpath); 572bf5a70e1SHenning Rogge } 573b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 574bf5a70e1SHenning Rogge } 575bf5a70e1SHenning Rogge 57660854fd9SBob Copeland static void table_flush_by_iface(struct mesh_table *tbl) 577eb2b9311SLuis Carlos Cobo { 578eb2b9311SLuis Carlos Cobo struct mesh_path *mpath; 579b4c3fbe6SHerbert Xu struct hlist_node *n; 580eb2b9311SLuis Carlos Cobo 581b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 582b4c3fbe6SHerbert Xu hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { 58360854fd9SBob Copeland __mesh_path_del(tbl, mpath); 584eb2b9311SLuis Carlos Cobo } 585b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 586eb2b9311SLuis Carlos Cobo } 587eb2b9311SLuis Carlos Cobo 588ece1a2e7SJavier Cardona /** 589ece1a2e7SJavier Cardona * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface 590ece1a2e7SJavier Cardona * 591ece1a2e7SJavier Cardona * This function deletes both mesh paths as well as mesh portal paths. 592ece1a2e7SJavier Cardona * 5932c53040fSBen Hutchings * @sdata: interface data to match 594ece1a2e7SJavier Cardona * 595ece1a2e7SJavier Cardona */ 596ece1a2e7SJavier Cardona void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) 597eb2b9311SLuis Carlos Cobo { 59860854fd9SBob Copeland table_flush_by_iface(sdata->u.mesh.mesh_paths); 59960854fd9SBob Copeland table_flush_by_iface(sdata->u.mesh.mpp_paths); 600eb2b9311SLuis Carlos Cobo } 601eb2b9311SLuis Carlos Cobo 602eb2b9311SLuis Carlos Cobo /** 6034cc955deSHenning Rogge * table_path_del - delete a path from the mesh or mpp table 604eb2b9311SLuis Carlos Cobo * 6054cc955deSHenning Rogge * @tbl: mesh or mpp path table 606f698d856SJasper Bryant-Greene * @sdata: local subif 6074cc955deSHenning Rogge * @addr: dst address (ETH_ALEN length) 608eb2b9311SLuis Carlos Cobo * 609af901ca1SAndré Goddard Rosa * Returns: 0 if successful 610eb2b9311SLuis Carlos Cobo */ 61160854fd9SBob Copeland static int table_path_del(struct mesh_table *tbl, 6124cc955deSHenning Rogge struct ieee80211_sub_if_data *sdata, 6134cc955deSHenning Rogge const u8 *addr) 614eb2b9311SLuis Carlos Cobo { 615eb2b9311SLuis Carlos Cobo struct mesh_path *mpath; 616eb2b9311SLuis Carlos Cobo 617b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 61860854fd9SBob Copeland mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params); 61960854fd9SBob Copeland if (!mpath) { 620f2ffff08SWei Yongjun spin_unlock_bh(&tbl->walk_lock); 62160854fd9SBob Copeland return -ENXIO; 622eb2b9311SLuis Carlos Cobo } 623eb2b9311SLuis Carlos Cobo 62460854fd9SBob Copeland __mesh_path_del(tbl, mpath); 625b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 62660854fd9SBob Copeland return 0; 6274cc955deSHenning Rogge } 6284cc955deSHenning Rogge 62960854fd9SBob Copeland 6304cc955deSHenning Rogge /** 6314cc955deSHenning Rogge * mesh_path_del - delete a mesh path from the table 6324cc955deSHenning Rogge * 6334cc955deSHenning Rogge * @addr: dst address (ETH_ALEN length) 6344cc955deSHenning Rogge * @sdata: local subif 6354cc955deSHenning Rogge * 6364cc955deSHenning Rogge * Returns: 0 if successful 6374cc955deSHenning Rogge */ 6384cc955deSHenning Rogge int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) 6394cc955deSHenning Rogge { 64060854fd9SBob Copeland int err; 6414cc955deSHenning Rogge 6424cc955deSHenning Rogge /* flush relevant mpp entries first */ 6434cc955deSHenning Rogge mpp_flush_by_proxy(sdata, addr); 6444cc955deSHenning Rogge 6452bdaf386SBob Copeland err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr); 6462bdaf386SBob Copeland sdata->u.mesh.mesh_paths_generation++; 647ab1c7906SHenning Rogge return err; 648ab1c7906SHenning Rogge } 649ab1c7906SHenning Rogge 650ab1c7906SHenning Rogge /** 651eb2b9311SLuis Carlos Cobo * mesh_path_tx_pending - sends pending frames in a mesh path queue 652eb2b9311SLuis Carlos Cobo * 653eb2b9311SLuis Carlos Cobo * @mpath: mesh path to activate 654eb2b9311SLuis Carlos Cobo * 655eb2b9311SLuis Carlos Cobo * Locking: the state_lock of the mpath structure must NOT be held when calling 656eb2b9311SLuis Carlos Cobo * this function. 657eb2b9311SLuis Carlos Cobo */ 658eb2b9311SLuis Carlos Cobo void mesh_path_tx_pending(struct mesh_path *mpath) 659eb2b9311SLuis Carlos Cobo { 660249b405cSJavier Cardona if (mpath->flags & MESH_PATH_ACTIVE) 661249b405cSJavier Cardona ieee80211_add_pending_skbs(mpath->sdata->local, 662249b405cSJavier Cardona &mpath->frame_queue); 663eb2b9311SLuis Carlos Cobo } 664eb2b9311SLuis Carlos Cobo 665eb2b9311SLuis Carlos Cobo /** 6665ee68e5bSJavier Cardona * mesh_path_send_to_gates - sends pending frames to all known mesh gates 6675ee68e5bSJavier Cardona * 6685ee68e5bSJavier Cardona * @mpath: mesh path whose queue will be emptied 6695ee68e5bSJavier Cardona * 6705ee68e5bSJavier Cardona * If there is only one gate, the frames are transferred from the failed mpath 6715ee68e5bSJavier Cardona * queue to that gate's queue. If there are more than one gates, the frames 6725ee68e5bSJavier Cardona * are copied from each gate to the next. After frames are copied, the 6735ee68e5bSJavier Cardona * mpath queues are emptied onto the transmission queue. 6745ee68e5bSJavier Cardona */ 6755ee68e5bSJavier Cardona int mesh_path_send_to_gates(struct mesh_path *mpath) 6765ee68e5bSJavier Cardona { 6775ee68e5bSJavier Cardona struct ieee80211_sub_if_data *sdata = mpath->sdata; 6785ee68e5bSJavier Cardona struct mesh_table *tbl; 6795ee68e5bSJavier Cardona struct mesh_path *from_mpath = mpath; 68060854fd9SBob Copeland struct mesh_path *gate; 6815ee68e5bSJavier Cardona bool copy = false; 6825ee68e5bSJavier Cardona 68360854fd9SBob Copeland tbl = sdata->u.mesh.mesh_paths; 6845ee68e5bSJavier Cardona 68560854fd9SBob Copeland rcu_read_lock(); 68618b27ff7SBob Copeland hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { 687947c2a0eSBob Copeland if (gate->flags & MESH_PATH_ACTIVE) { 688947c2a0eSBob Copeland mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst); 689947c2a0eSBob Copeland mesh_path_move_to_queue(gate, from_mpath, copy); 690947c2a0eSBob Copeland from_mpath = gate; 6915ee68e5bSJavier Cardona copy = true; 6925ee68e5bSJavier Cardona } else { 693bdcbd8e0SJohannes Berg mpath_dbg(sdata, 694d671b2a0SJohannes Berg "Not forwarding to %pM (flags %#x)\n", 695947c2a0eSBob Copeland gate->dst, gate->flags); 6965ee68e5bSJavier Cardona } 6975ee68e5bSJavier Cardona } 6985ee68e5bSJavier Cardona 69918b27ff7SBob Copeland hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { 700947c2a0eSBob Copeland mpath_dbg(sdata, "Sending to %pM\n", gate->dst); 701947c2a0eSBob Copeland mesh_path_tx_pending(gate); 7025ee68e5bSJavier Cardona } 70360854fd9SBob Copeland rcu_read_unlock(); 7045ee68e5bSJavier Cardona 7055ee68e5bSJavier Cardona return (from_mpath == mpath) ? -EHOSTUNREACH : 0; 7065ee68e5bSJavier Cardona } 7075ee68e5bSJavier Cardona 7085ee68e5bSJavier Cardona /** 709eb2b9311SLuis Carlos Cobo * mesh_path_discard_frame - discard a frame whose path could not be resolved 710eb2b9311SLuis Carlos Cobo * 711eb2b9311SLuis Carlos Cobo * @skb: frame to discard 712f698d856SJasper Bryant-Greene * @sdata: network subif the frame was to be sent through 713eb2b9311SLuis Carlos Cobo * 714eb2b9311SLuis Carlos Cobo * Locking: the function must me called within a rcu_read_lock region 715eb2b9311SLuis Carlos Cobo */ 716bf7cd94dSJohannes Berg void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, 717bf7cd94dSJohannes Berg struct sk_buff *skb) 718eb2b9311SLuis Carlos Cobo { 719eb2b9311SLuis Carlos Cobo kfree_skb(skb); 720472dbc45SJohannes Berg sdata->u.mesh.mshstats.dropped_frames_no_route++; 721eb2b9311SLuis Carlos Cobo } 722eb2b9311SLuis Carlos Cobo 723eb2b9311SLuis Carlos Cobo /** 724eb2b9311SLuis Carlos Cobo * mesh_path_flush_pending - free the pending queue of a mesh path 725eb2b9311SLuis Carlos Cobo * 726eb2b9311SLuis Carlos Cobo * @mpath: mesh path whose queue has to be freed 727eb2b9311SLuis Carlos Cobo * 72825985edcSLucas De Marchi * Locking: the function must me called within a rcu_read_lock region 729eb2b9311SLuis Carlos Cobo */ 730eb2b9311SLuis Carlos Cobo void mesh_path_flush_pending(struct mesh_path *mpath) 731eb2b9311SLuis Carlos Cobo { 732eb2b9311SLuis Carlos Cobo struct sk_buff *skb; 733eb2b9311SLuis Carlos Cobo 73400e3f25cSJavier Cardona while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) 735bf7cd94dSJohannes Berg mesh_path_discard_frame(mpath->sdata, skb); 736eb2b9311SLuis Carlos Cobo } 737eb2b9311SLuis Carlos Cobo 738eb2b9311SLuis Carlos Cobo /** 739eb2b9311SLuis Carlos Cobo * mesh_path_fix_nexthop - force a specific next hop for a mesh path 740eb2b9311SLuis Carlos Cobo * 741eb2b9311SLuis Carlos Cobo * @mpath: the mesh path to modify 742eb2b9311SLuis Carlos Cobo * @next_hop: the next hop to force 743eb2b9311SLuis Carlos Cobo * 744eb2b9311SLuis Carlos Cobo * Locking: this function must be called holding mpath->state_lock 745eb2b9311SLuis Carlos Cobo */ 746eb2b9311SLuis Carlos Cobo void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) 747eb2b9311SLuis Carlos Cobo { 748eb2b9311SLuis Carlos Cobo spin_lock_bh(&mpath->state_lock); 749eb2b9311SLuis Carlos Cobo mesh_path_assign_nexthop(mpath, next_hop); 750d19b3bf6SRui Paulo mpath->sn = 0xffff; 751eb2b9311SLuis Carlos Cobo mpath->metric = 0; 752eb2b9311SLuis Carlos Cobo mpath->hop_count = 0; 753eb2b9311SLuis Carlos Cobo mpath->exp_time = 0; 7545df20f21SPedersen, Thomas mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID; 755eb2b9311SLuis Carlos Cobo mesh_path_activate(mpath); 756eb2b9311SLuis Carlos Cobo spin_unlock_bh(&mpath->state_lock); 7573eb0928fSManoharan, Rajkumar ewma_mesh_fail_avg_init(&next_hop->mesh->fail_avg); 7583eb0928fSManoharan, Rajkumar /* init it at a low value - 0 start is tricky */ 7593eb0928fSManoharan, Rajkumar ewma_mesh_fail_avg_add(&next_hop->mesh->fail_avg, 1); 760eb2b9311SLuis Carlos Cobo mesh_path_tx_pending(mpath); 761eb2b9311SLuis Carlos Cobo } 762eb2b9311SLuis Carlos Cobo 7632bdaf386SBob Copeland int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata) 764eb2b9311SLuis Carlos Cobo { 765349eb8cfSJohannes Berg struct mesh_table *tbl_path, *tbl_mpp; 7664c5ade41SDan Carpenter int ret; 76779617deeSYanBo 76860854fd9SBob Copeland tbl_path = mesh_table_alloc(); 769349eb8cfSJohannes Berg if (!tbl_path) 770349eb8cfSJohannes Berg return -ENOMEM; 7715ee68e5bSJavier Cardona 77260854fd9SBob Copeland tbl_mpp = mesh_table_alloc(); 773349eb8cfSJohannes Berg if (!tbl_mpp) { 7744c5ade41SDan Carpenter ret = -ENOMEM; 7754c5ade41SDan Carpenter goto free_path; 77679617deeSYanBo } 777349eb8cfSJohannes Berg 77860854fd9SBob Copeland rhashtable_init(&tbl_path->rhead, &mesh_rht_params); 77960854fd9SBob Copeland rhashtable_init(&tbl_mpp->rhead, &mesh_rht_params); 7802bdaf386SBob Copeland 78160854fd9SBob Copeland sdata->u.mesh.mesh_paths = tbl_path; 78260854fd9SBob Copeland sdata->u.mesh.mpp_paths = tbl_mpp; 78379617deeSYanBo 784eb2b9311SLuis Carlos Cobo return 0; 7854c5ade41SDan Carpenter 7864c5ade41SDan Carpenter free_path: 78760854fd9SBob Copeland mesh_table_free(tbl_path); 7884c5ade41SDan Carpenter return ret; 789eb2b9311SLuis Carlos Cobo } 790eb2b9311SLuis Carlos Cobo 79160854fd9SBob Copeland static 79260854fd9SBob Copeland void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata, 79360854fd9SBob Copeland struct mesh_table *tbl) 79460854fd9SBob Copeland { 79560854fd9SBob Copeland struct mesh_path *mpath; 796b4c3fbe6SHerbert Xu struct hlist_node *n; 79760854fd9SBob Copeland 798b4c3fbe6SHerbert Xu spin_lock_bh(&tbl->walk_lock); 799b4c3fbe6SHerbert Xu hlist_for_each_entry_safe(mpath, n, &tbl->walk_head, walk_list) { 80060854fd9SBob Copeland if ((!(mpath->flags & MESH_PATH_RESOLVING)) && 80160854fd9SBob Copeland (!(mpath->flags & MESH_PATH_FIXED)) && 80260854fd9SBob Copeland time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) 80360854fd9SBob Copeland __mesh_path_del(tbl, mpath); 80460854fd9SBob Copeland } 805b4c3fbe6SHerbert Xu spin_unlock_bh(&tbl->walk_lock); 80660854fd9SBob Copeland } 80760854fd9SBob Copeland 808f698d856SJasper Bryant-Greene void mesh_path_expire(struct ieee80211_sub_if_data *sdata) 809eb2b9311SLuis Carlos Cobo { 81060854fd9SBob Copeland mesh_path_tbl_expire(sdata, sdata->u.mesh.mesh_paths); 81160854fd9SBob Copeland mesh_path_tbl_expire(sdata, sdata->u.mesh.mpp_paths); 812eb2b9311SLuis Carlos Cobo } 813eb2b9311SLuis Carlos Cobo 8142bdaf386SBob Copeland void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata) 815eb2b9311SLuis Carlos Cobo { 81660854fd9SBob Copeland mesh_table_free(sdata->u.mesh.mesh_paths); 81760854fd9SBob Copeland mesh_table_free(sdata->u.mesh.mpp_paths); 818eb2b9311SLuis Carlos Cobo } 819