Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1 | /* |
Rui Paulo | 264d9b7 | 2009-11-09 23:46:58 +0000 | [diff] [blame] | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/etherdevice.h> |
| 11 | #include <linux/list.h> |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 12 | #include <linux/random.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/slab.h> |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 14 | #include <linux/spinlock.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <net/mac80211.h> |
Javier Cardona | 4777be4 | 2011-09-07 17:49:52 -0700 | [diff] [blame] | 17 | #include "wme.h" |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 18 | #include "ieee80211_i.h" |
| 19 | #include "mesh.h" |
| 20 | |
| 21 | /* There will be initially 2^INIT_PATHS_SIZE_ORDER buckets */ |
| 22 | #define INIT_PATHS_SIZE_ORDER 2 |
| 23 | |
| 24 | /* Keep the mean chain length below this constant */ |
| 25 | #define MEAN_CHAIN_LEN 2 |
| 26 | |
| 27 | #define MPATH_EXPIRED(mpath) ((mpath->flags & MESH_PATH_ACTIVE) && \ |
| 28 | time_after(jiffies, mpath->exp_time) && \ |
| 29 | !(mpath->flags & MESH_PATH_FIXED)) |
| 30 | |
| 31 | struct mpath_node { |
| 32 | struct hlist_node list; |
| 33 | struct rcu_head rcu; |
| 34 | /* This indirection allows two different tables to point to the same |
| 35 | * mesh_path structure, useful when resizing |
| 36 | */ |
| 37 | struct mesh_path *mpath; |
| 38 | }; |
| 39 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 40 | static struct mesh_table __rcu *mesh_paths; |
| 41 | static struct mesh_table __rcu *mpp_paths; /* Store paths for MPP&MAP */ |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 42 | |
Johannes Berg | f5ea912 | 2009-08-07 16:17:38 +0200 | [diff] [blame] | 43 | int mesh_paths_generation; |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 44 | |
| 45 | /* This lock will have the grow table function as writer and add / delete nodes |
Javier Cardona | 239289e | 2011-08-29 13:23:09 -0700 | [diff] [blame] | 46 | * as readers. RCU provides sufficient protection only when reading the table |
| 47 | * (i.e. doing lookups). Adding or adding or removing nodes requires we take |
| 48 | * the read lock or we risk operating on an old table. The write lock is only |
| 49 | * needed when modifying the number of buckets a table. |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 50 | */ |
| 51 | static DEFINE_RWLOCK(pathtbl_resize_lock); |
| 52 | |
| 53 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 54 | static inline struct mesh_table *resize_dereference_mesh_paths(void) |
| 55 | { |
| 56 | return rcu_dereference_protected(mesh_paths, |
| 57 | lockdep_is_held(&pathtbl_resize_lock)); |
| 58 | } |
| 59 | |
| 60 | static inline struct mesh_table *resize_dereference_mpp_paths(void) |
| 61 | { |
| 62 | return rcu_dereference_protected(mpp_paths, |
| 63 | lockdep_is_held(&pathtbl_resize_lock)); |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * CAREFUL -- "tbl" must not be an expression, |
| 68 | * in particular not an rcu_dereference(), since |
| 69 | * it's used twice. So it is illegal to do |
| 70 | * for_each_mesh_entry(rcu_dereference(...), ...) |
| 71 | */ |
| 72 | #define for_each_mesh_entry(tbl, p, node, i) \ |
| 73 | for (i = 0; i <= tbl->hash_mask; i++) \ |
| 74 | hlist_for_each_entry_rcu(node, p, &tbl->hash_buckets[i], list) |
| 75 | |
| 76 | |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 77 | static struct mesh_table *mesh_table_alloc(int size_order) |
| 78 | { |
| 79 | int i; |
| 80 | struct mesh_table *newtbl; |
| 81 | |
Javier Cardona | d676ff4 | 2011-05-17 16:13:34 -0700 | [diff] [blame] | 82 | newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC); |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 83 | if (!newtbl) |
| 84 | return NULL; |
| 85 | |
| 86 | newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) * |
Javier Cardona | d676ff4 | 2011-05-17 16:13:34 -0700 | [diff] [blame] | 87 | (1 << size_order), GFP_ATOMIC); |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 88 | |
| 89 | if (!newtbl->hash_buckets) { |
| 90 | kfree(newtbl); |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | newtbl->hashwlock = kmalloc(sizeof(spinlock_t) * |
Javier Cardona | d676ff4 | 2011-05-17 16:13:34 -0700 | [diff] [blame] | 95 | (1 << size_order), GFP_ATOMIC); |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 96 | if (!newtbl->hashwlock) { |
| 97 | kfree(newtbl->hash_buckets); |
| 98 | kfree(newtbl); |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | newtbl->size_order = size_order; |
| 103 | newtbl->hash_mask = (1 << size_order) - 1; |
| 104 | atomic_set(&newtbl->entries, 0); |
| 105 | get_random_bytes(&newtbl->hash_rnd, |
| 106 | sizeof(newtbl->hash_rnd)); |
| 107 | for (i = 0; i <= newtbl->hash_mask; i++) |
| 108 | spin_lock_init(&newtbl->hashwlock[i]); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 109 | spin_lock_init(&newtbl->gates_lock); |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 110 | |
| 111 | return newtbl; |
| 112 | } |
| 113 | |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 114 | static void __mesh_table_free(struct mesh_table *tbl) |
| 115 | { |
| 116 | kfree(tbl->hash_buckets); |
| 117 | kfree(tbl->hashwlock); |
| 118 | kfree(tbl); |
| 119 | } |
| 120 | |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 121 | static void mesh_table_free(struct mesh_table *tbl, bool free_leafs) |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 122 | { |
| 123 | struct hlist_head *mesh_hash; |
| 124 | struct hlist_node *p, *q; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 125 | struct mpath_node *gate; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 126 | int i; |
| 127 | |
| 128 | mesh_hash = tbl->hash_buckets; |
| 129 | for (i = 0; i <= tbl->hash_mask; i++) { |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 130 | spin_lock_bh(&tbl->hashwlock[i]); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 131 | hlist_for_each_safe(p, q, &mesh_hash[i]) { |
| 132 | tbl->free_node(p, free_leafs); |
| 133 | atomic_dec(&tbl->entries); |
| 134 | } |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 135 | spin_unlock_bh(&tbl->hashwlock[i]); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 136 | } |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 137 | if (free_leafs) { |
| 138 | spin_lock_bh(&tbl->gates_lock); |
| 139 | hlist_for_each_entry_safe(gate, p, q, |
| 140 | tbl->known_gates, list) { |
| 141 | hlist_del(&gate->list); |
| 142 | kfree(gate); |
| 143 | } |
| 144 | kfree(tbl->known_gates); |
| 145 | spin_unlock_bh(&tbl->gates_lock); |
| 146 | } |
| 147 | |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 148 | __mesh_table_free(tbl); |
| 149 | } |
| 150 | |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 151 | static int mesh_table_grow(struct mesh_table *oldtbl, |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 152 | struct mesh_table *newtbl) |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 153 | { |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 154 | struct hlist_head *oldhash; |
| 155 | struct hlist_node *p, *q; |
| 156 | int i; |
| 157 | |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 158 | if (atomic_read(&oldtbl->entries) |
| 159 | < oldtbl->mean_chain_len * (oldtbl->hash_mask + 1)) |
| 160 | return -EAGAIN; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 161 | |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 162 | newtbl->free_node = oldtbl->free_node; |
| 163 | newtbl->mean_chain_len = oldtbl->mean_chain_len; |
| 164 | newtbl->copy_node = oldtbl->copy_node; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 165 | newtbl->known_gates = oldtbl->known_gates; |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 166 | atomic_set(&newtbl->entries, atomic_read(&oldtbl->entries)); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 167 | |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 168 | oldhash = oldtbl->hash_buckets; |
| 169 | for (i = 0; i <= oldtbl->hash_mask; i++) |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 170 | hlist_for_each(p, &oldhash[i]) |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 171 | if (oldtbl->copy_node(p, newtbl) < 0) |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 172 | goto errcopy; |
| 173 | |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 174 | return 0; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 175 | |
| 176 | errcopy: |
| 177 | for (i = 0; i <= newtbl->hash_mask; i++) { |
| 178 | hlist_for_each_safe(p, q, &newtbl->hash_buckets[i]) |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 179 | oldtbl->free_node(p, 0); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 180 | } |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 181 | return -ENOMEM; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame^] | 184 | static u32 mesh_table_hash(const u8 *addr, struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 185 | struct mesh_table *tbl) |
| 186 | { |
| 187 | /* Use last four bytes of hw addr and interface index as hash index */ |
| 188 | return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd) |
| 189 | & tbl->hash_mask; |
| 190 | } |
Johannes Berg | f5ea912 | 2009-08-07 16:17:38 +0200 | [diff] [blame] | 191 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 192 | |
| 193 | /** |
| 194 | * |
| 195 | * mesh_path_assign_nexthop - update mesh path next hop |
| 196 | * |
| 197 | * @mpath: mesh path to update |
| 198 | * @sta: next hop to assign |
| 199 | * |
| 200 | * Locking: mpath->state_lock must be held when calling this function |
| 201 | */ |
| 202 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) |
| 203 | { |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 204 | struct sk_buff *skb; |
| 205 | struct ieee80211_hdr *hdr; |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 206 | unsigned long flags; |
| 207 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 208 | rcu_assign_pointer(mpath->next_hop, sta); |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 209 | |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 210 | spin_lock_irqsave(&mpath->frame_queue.lock, flags); |
Thomas Pedersen | b22bd52 | 2012-08-09 18:15:39 -0700 | [diff] [blame] | 211 | skb_queue_walk(&mpath->frame_queue, skb) { |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 212 | hdr = (struct ieee80211_hdr *) skb->data; |
| 213 | memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); |
Thomas Pedersen | 7e3c886 | 2011-11-24 17:15:21 -0800 | [diff] [blame] | 214 | memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); |
Marco Porsch | 3f52b7e | 2013-01-30 18:14:08 +0100 | [diff] [blame] | 215 | ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 216 | } |
| 217 | |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 218 | spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 219 | } |
| 220 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 221 | static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, |
| 222 | struct mesh_path *gate_mpath) |
| 223 | { |
| 224 | struct ieee80211_hdr *hdr; |
| 225 | struct ieee80211s_hdr *mshdr; |
| 226 | int mesh_hdrlen, hdrlen; |
| 227 | char *next_hop; |
| 228 | |
| 229 | hdr = (struct ieee80211_hdr *) skb->data; |
| 230 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 231 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| 232 | |
| 233 | if (!(mshdr->flags & MESH_FLAGS_AE)) { |
| 234 | /* size of the fixed part of the mesh header */ |
| 235 | mesh_hdrlen = 6; |
| 236 | |
| 237 | /* make room for the two extended addresses */ |
| 238 | skb_push(skb, 2 * ETH_ALEN); |
| 239 | memmove(skb->data, hdr, hdrlen + mesh_hdrlen); |
| 240 | |
| 241 | hdr = (struct ieee80211_hdr *) skb->data; |
| 242 | |
| 243 | /* we preserve the previous mesh header and only add |
| 244 | * the new addreses */ |
| 245 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| 246 | mshdr->flags = MESH_FLAGS_AE_A5_A6; |
| 247 | memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); |
| 248 | memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); |
| 249 | } |
| 250 | |
| 251 | /* update next hop */ |
| 252 | hdr = (struct ieee80211_hdr *) skb->data; |
| 253 | rcu_read_lock(); |
| 254 | next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; |
| 255 | memcpy(hdr->addr1, next_hop, ETH_ALEN); |
| 256 | rcu_read_unlock(); |
Thomas Pedersen | 7e3c886 | 2011-11-24 17:15:21 -0800 | [diff] [blame] | 257 | memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 258 | memcpy(hdr->addr3, dst_addr, ETH_ALEN); |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * |
| 263 | * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another |
| 264 | * |
| 265 | * This function is used to transfer or copy frames from an unresolved mpath to |
| 266 | * a gate mpath. The function also adds the Address Extension field and |
| 267 | * updates the next hop. |
| 268 | * |
| 269 | * If a frame already has an Address Extension field, only the next hop and |
| 270 | * destination addresses are updated. |
| 271 | * |
| 272 | * The gate mpath must be an active mpath with a valid mpath->next_hop. |
| 273 | * |
| 274 | * @mpath: An active mpath the frames will be sent to (i.e. the gate) |
| 275 | * @from_mpath: The failed mpath |
| 276 | * @copy: When true, copy all the frames to the new mpath queue. When false, |
| 277 | * move them. |
| 278 | */ |
| 279 | static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, |
| 280 | struct mesh_path *from_mpath, |
| 281 | bool copy) |
| 282 | { |
Thomas Pedersen | 4bd4c2d | 2012-08-09 18:15:40 -0700 | [diff] [blame] | 283 | struct sk_buff *skb, *fskb, *tmp; |
| 284 | struct sk_buff_head failq; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 285 | unsigned long flags; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 286 | |
| 287 | BUG_ON(gate_mpath == from_mpath); |
| 288 | BUG_ON(!gate_mpath->next_hop); |
| 289 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 290 | __skb_queue_head_init(&failq); |
| 291 | |
| 292 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); |
| 293 | skb_queue_splice_init(&from_mpath->frame_queue, &failq); |
| 294 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); |
| 295 | |
Thomas Pedersen | 4bd4c2d | 2012-08-09 18:15:40 -0700 | [diff] [blame] | 296 | skb_queue_walk_safe(&failq, fskb, tmp) { |
| 297 | if (skb_queue_len(&gate_mpath->frame_queue) >= |
| 298 | MESH_FRAME_QUEUE_LEN) { |
| 299 | mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); |
| 300 | break; |
John W. Linville | 817a53d | 2011-08-24 15:12:41 -0400 | [diff] [blame] | 301 | } |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 302 | |
Thomas Pedersen | 4bd4c2d | 2012-08-09 18:15:40 -0700 | [diff] [blame] | 303 | skb = skb_copy(fskb, GFP_ATOMIC); |
| 304 | if (WARN_ON(!skb)) |
| 305 | break; |
| 306 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 307 | prepare_for_gate(skb, gate_mpath->dst, gate_mpath); |
Thomas Pedersen | 4bd4c2d | 2012-08-09 18:15:40 -0700 | [diff] [blame] | 308 | skb_queue_tail(&gate_mpath->frame_queue, skb); |
| 309 | |
| 310 | if (copy) |
| 311 | continue; |
| 312 | |
| 313 | __skb_unlink(fskb, &failq); |
| 314 | kfree_skb(fskb); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 315 | } |
| 316 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 317 | mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", |
| 318 | gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 319 | |
| 320 | if (!copy) |
| 321 | return; |
| 322 | |
| 323 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); |
| 324 | skb_queue_splice(&failq, &from_mpath->frame_queue); |
| 325 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); |
| 326 | } |
| 327 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 328 | |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame^] | 329 | static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, |
| 330 | struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 331 | { |
| 332 | struct mesh_path *mpath; |
| 333 | struct hlist_node *n; |
| 334 | struct hlist_head *bucket; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 335 | struct mpath_node *node; |
| 336 | |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 337 | bucket = &tbl->hash_buckets[mesh_table_hash(dst, sdata, tbl)]; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 338 | hlist_for_each_entry_rcu(node, n, bucket, list) { |
| 339 | mpath = node->mpath; |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 340 | if (mpath->sdata == sdata && |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 341 | ether_addr_equal(dst, mpath->dst)) { |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 342 | if (MPATH_EXPIRED(mpath)) { |
| 343 | spin_lock_bh(&mpath->state_lock); |
Javier Cardona | ad99d14 | 2011-08-29 13:23:06 -0700 | [diff] [blame] | 344 | mpath->flags &= ~MESH_PATH_ACTIVE; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 345 | spin_unlock_bh(&mpath->state_lock); |
| 346 | } |
| 347 | return mpath; |
| 348 | } |
| 349 | } |
| 350 | return NULL; |
| 351 | } |
| 352 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 353 | /** |
| 354 | * mesh_path_lookup - look up a path in the mesh path table |
| 355 | * @dst: hardware address (ETH_ALEN length) of destination |
| 356 | * @sdata: local subif |
| 357 | * |
| 358 | * Returns: pointer to the mesh path structure, or NULL if not found |
| 359 | * |
| 360 | * Locking: must be called within a read rcu section. |
| 361 | */ |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame^] | 362 | struct mesh_path *mesh_path_lookup(const u8 *dst, |
| 363 | struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 364 | { |
Luis R. Rodriguez | 5ad20dd | 2012-02-07 21:09:25 -0800 | [diff] [blame] | 365 | return mpath_lookup(rcu_dereference(mesh_paths), dst, sdata); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 366 | } |
| 367 | |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 368 | struct mesh_path *mpp_path_lookup(u8 *dst, struct ieee80211_sub_if_data *sdata) |
| 369 | { |
Luis R. Rodriguez | 5ad20dd | 2012-02-07 21:09:25 -0800 | [diff] [blame] | 370 | return mpath_lookup(rcu_dereference(mpp_paths), dst, sdata); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 374 | /** |
| 375 | * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index |
| 376 | * @idx: index |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 377 | * @sdata: local subif, or NULL for all entries |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 378 | * |
| 379 | * Returns: pointer to the mesh path structure, or NULL if not found. |
| 380 | * |
| 381 | * Locking: must be called within a read rcu section. |
| 382 | */ |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 383 | struct mesh_path *mesh_path_lookup_by_idx(int idx, struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 384 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 385 | struct mesh_table *tbl = rcu_dereference(mesh_paths); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 386 | struct mpath_node *node; |
| 387 | struct hlist_node *p; |
| 388 | int i; |
| 389 | int j = 0; |
| 390 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 391 | for_each_mesh_entry(tbl, p, node, i) { |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 392 | if (sdata && node->mpath->sdata != sdata) |
Luis Carlos Cobo | 2a8ca29 | 2008-02-29 17:51:25 -0800 | [diff] [blame] | 393 | continue; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 394 | if (j++ == idx) { |
| 395 | if (MPATH_EXPIRED(node->mpath)) { |
| 396 | spin_lock_bh(&node->mpath->state_lock); |
Javier Cardona | ad99d14 | 2011-08-29 13:23:06 -0700 | [diff] [blame] | 397 | node->mpath->flags &= ~MESH_PATH_ACTIVE; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 398 | spin_unlock_bh(&node->mpath->state_lock); |
| 399 | } |
| 400 | return node->mpath; |
| 401 | } |
Luis Carlos Cobo | 2a8ca29 | 2008-02-29 17:51:25 -0800 | [diff] [blame] | 402 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 403 | |
| 404 | return NULL; |
| 405 | } |
| 406 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 407 | /** |
Johannes Berg | 30be52e | 2011-11-21 11:23:50 +0100 | [diff] [blame] | 408 | * mesh_path_add_gate - add the given mpath to a mesh gate to our path table |
| 409 | * @mpath: gate path to add to table |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 410 | */ |
Johannes Berg | 30be52e | 2011-11-21 11:23:50 +0100 | [diff] [blame] | 411 | int mesh_path_add_gate(struct mesh_path *mpath) |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 412 | { |
Johannes Berg | 30be52e | 2011-11-21 11:23:50 +0100 | [diff] [blame] | 413 | struct mesh_table *tbl; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 414 | struct mpath_node *gate, *new_gate; |
| 415 | struct hlist_node *n; |
| 416 | int err; |
| 417 | |
| 418 | rcu_read_lock(); |
Johannes Berg | 30be52e | 2011-11-21 11:23:50 +0100 | [diff] [blame] | 419 | tbl = rcu_dereference(mesh_paths); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 420 | |
| 421 | hlist_for_each_entry_rcu(gate, n, tbl->known_gates, list) |
| 422 | if (gate->mpath == mpath) { |
| 423 | err = -EEXIST; |
| 424 | goto err_rcu; |
| 425 | } |
| 426 | |
| 427 | new_gate = kzalloc(sizeof(struct mpath_node), GFP_ATOMIC); |
| 428 | if (!new_gate) { |
| 429 | err = -ENOMEM; |
| 430 | goto err_rcu; |
| 431 | } |
| 432 | |
| 433 | mpath->is_gate = true; |
| 434 | mpath->sdata->u.mesh.num_gates++; |
| 435 | new_gate->mpath = mpath; |
| 436 | spin_lock_bh(&tbl->gates_lock); |
| 437 | hlist_add_head_rcu(&new_gate->list, tbl->known_gates); |
| 438 | spin_unlock_bh(&tbl->gates_lock); |
| 439 | rcu_read_unlock(); |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 440 | mpath_dbg(mpath->sdata, |
| 441 | "Mesh path: Recorded new gate: %pM. %d known gates\n", |
| 442 | mpath->dst, mpath->sdata->u.mesh.num_gates); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 443 | return 0; |
| 444 | err_rcu: |
| 445 | rcu_read_unlock(); |
| 446 | return err; |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * mesh_gate_del - remove a mesh gate from the list of known gates |
| 451 | * @tbl: table which holds our list of known gates |
| 452 | * @mpath: gate mpath |
| 453 | * |
| 454 | * Returns: 0 on success |
| 455 | * |
| 456 | * Locking: must be called inside rcu_read_lock() section |
| 457 | */ |
| 458 | static int mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) |
| 459 | { |
| 460 | struct mpath_node *gate; |
| 461 | struct hlist_node *p, *q; |
| 462 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 463 | hlist_for_each_entry_safe(gate, p, q, tbl->known_gates, list) |
| 464 | if (gate->mpath == mpath) { |
| 465 | spin_lock_bh(&tbl->gates_lock); |
| 466 | hlist_del_rcu(&gate->list); |
Paul E. McKenney | ae1f18e | 2012-01-06 17:10:37 -0800 | [diff] [blame] | 467 | kfree_rcu(gate, rcu); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 468 | spin_unlock_bh(&tbl->gates_lock); |
| 469 | mpath->sdata->u.mesh.num_gates--; |
| 470 | mpath->is_gate = false; |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 471 | mpath_dbg(mpath->sdata, |
| 472 | "Mesh path: Deleted gate: %pM. %d known gates\n", |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 473 | mpath->dst, mpath->sdata->u.mesh.num_gates); |
| 474 | break; |
| 475 | } |
| 476 | |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | /** |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 481 | * mesh_gate_num - number of gates known to this interface |
| 482 | * @sdata: subif data |
| 483 | */ |
| 484 | int mesh_gate_num(struct ieee80211_sub_if_data *sdata) |
| 485 | { |
| 486 | return sdata->u.mesh.num_gates; |
| 487 | } |
| 488 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 489 | /** |
| 490 | * mesh_path_add - allocate and add a new path to the mesh path table |
| 491 | * @addr: destination address of the path (ETH_ALEN length) |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 492 | * @sdata: local subif |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 493 | * |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 494 | * Returns: 0 on success |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 495 | * |
| 496 | * State: the initial state of the new path is set to 0 |
| 497 | */ |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame^] | 498 | int mesh_path_add(const u8 *dst, struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 499 | { |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 500 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
| 501 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 502 | struct mesh_table *tbl; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 503 | struct mesh_path *mpath, *new_mpath; |
| 504 | struct mpath_node *node, *new_node; |
| 505 | struct hlist_head *bucket; |
| 506 | struct hlist_node *n; |
| 507 | int grow = 0; |
| 508 | int err = 0; |
| 509 | u32 hash_idx; |
| 510 | |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 511 | if (ether_addr_equal(dst, sdata->vif.addr)) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 512 | /* never add ourselves as neighbours */ |
| 513 | return -ENOTSUPP; |
| 514 | |
| 515 | if (is_multicast_ether_addr(dst)) |
| 516 | return -ENOTSUPP; |
| 517 | |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 518 | if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 519 | return -ENOSPC; |
| 520 | |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 521 | err = -ENOMEM; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 522 | new_mpath = kzalloc(sizeof(struct mesh_path), GFP_ATOMIC); |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 523 | if (!new_mpath) |
| 524 | goto err_path_alloc; |
| 525 | |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 526 | new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC); |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 527 | if (!new_node) |
| 528 | goto err_node_alloc; |
Pavel Emelyanov | f84e71a | 2008-05-06 18:46:36 +0400 | [diff] [blame] | 529 | |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 530 | read_lock_bh(&pathtbl_resize_lock); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 531 | memcpy(new_mpath->dst, dst, ETH_ALEN); |
Johannes Berg | e83e654 | 2012-07-13 16:23:07 +0200 | [diff] [blame] | 532 | eth_broadcast_addr(new_mpath->rann_snd_addr); |
Chun-Yeow Yeoh | 35bcd59 | 2012-04-10 12:31:56 +0800 | [diff] [blame] | 533 | new_mpath->is_root = false; |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 534 | new_mpath->sdata = sdata; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 535 | new_mpath->flags = 0; |
| 536 | skb_queue_head_init(&new_mpath->frame_queue); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 537 | new_node->mpath = new_mpath; |
| 538 | new_mpath->timer.data = (unsigned long) new_mpath; |
| 539 | new_mpath->timer.function = mesh_path_timer; |
| 540 | new_mpath->exp_time = jiffies; |
| 541 | spin_lock_init(&new_mpath->state_lock); |
| 542 | init_timer(&new_mpath->timer); |
| 543 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 544 | tbl = resize_dereference_mesh_paths(); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 545 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 546 | hash_idx = mesh_table_hash(dst, sdata, tbl); |
| 547 | bucket = &tbl->hash_buckets[hash_idx]; |
| 548 | |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 549 | spin_lock(&tbl->hashwlock[hash_idx]); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 550 | |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 551 | err = -EEXIST; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 552 | hlist_for_each_entry(node, n, bucket, list) { |
| 553 | mpath = node->mpath; |
Felix Fietkau | 888d04d | 2012-03-01 15:22:09 +0100 | [diff] [blame] | 554 | if (mpath->sdata == sdata && |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 555 | ether_addr_equal(dst, mpath->dst)) |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 556 | goto err_exists; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 557 | } |
| 558 | |
| 559 | hlist_add_head_rcu(&new_node->list, bucket); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 560 | if (atomic_inc_return(&tbl->entries) >= |
| 561 | tbl->mean_chain_len * (tbl->hash_mask + 1)) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 562 | grow = 1; |
| 563 | |
Johannes Berg | f5ea912 | 2009-08-07 16:17:38 +0200 | [diff] [blame] | 564 | mesh_paths_generation++; |
| 565 | |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 566 | spin_unlock(&tbl->hashwlock[hash_idx]); |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 567 | read_unlock_bh(&pathtbl_resize_lock); |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 568 | if (grow) { |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 569 | set_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags); |
Johannes Berg | 64592c8 | 2010-06-10 10:21:31 +0200 | [diff] [blame] | 570 | ieee80211_queue_work(&local->hw, &sdata->work); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 571 | } |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 572 | return 0; |
| 573 | |
| 574 | err_exists: |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 575 | spin_unlock(&tbl->hashwlock[hash_idx]); |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 576 | read_unlock_bh(&pathtbl_resize_lock); |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 577 | kfree(new_node); |
| 578 | err_node_alloc: |
| 579 | kfree(new_mpath); |
| 580 | err_path_alloc: |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 581 | atomic_dec(&sdata->u.mesh.mpaths); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 582 | return err; |
| 583 | } |
| 584 | |
Johannes Berg | 1928eca | 2011-05-14 11:00:52 +0200 | [diff] [blame] | 585 | static void mesh_table_free_rcu(struct rcu_head *rcu) |
| 586 | { |
| 587 | struct mesh_table *tbl = container_of(rcu, struct mesh_table, rcu_head); |
| 588 | |
| 589 | mesh_table_free(tbl, false); |
| 590 | } |
| 591 | |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 592 | void mesh_mpath_table_grow(void) |
| 593 | { |
| 594 | struct mesh_table *oldtbl, *newtbl; |
| 595 | |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 596 | write_lock_bh(&pathtbl_resize_lock); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 597 | oldtbl = resize_dereference_mesh_paths(); |
| 598 | newtbl = mesh_table_alloc(oldtbl->size_order + 1); |
Johannes Berg | 1928eca | 2011-05-14 11:00:52 +0200 | [diff] [blame] | 599 | if (!newtbl) |
| 600 | goto out; |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 601 | if (mesh_table_grow(oldtbl, newtbl) < 0) { |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 602 | __mesh_table_free(newtbl); |
Johannes Berg | 1928eca | 2011-05-14 11:00:52 +0200 | [diff] [blame] | 603 | goto out; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 604 | } |
| 605 | rcu_assign_pointer(mesh_paths, newtbl); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 606 | |
Johannes Berg | 1928eca | 2011-05-14 11:00:52 +0200 | [diff] [blame] | 607 | call_rcu(&oldtbl->rcu_head, mesh_table_free_rcu); |
| 608 | |
| 609 | out: |
| 610 | write_unlock_bh(&pathtbl_resize_lock); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | void mesh_mpp_table_grow(void) |
| 614 | { |
| 615 | struct mesh_table *oldtbl, *newtbl; |
| 616 | |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 617 | write_lock_bh(&pathtbl_resize_lock); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 618 | oldtbl = resize_dereference_mpp_paths(); |
| 619 | newtbl = mesh_table_alloc(oldtbl->size_order + 1); |
Johannes Berg | 1928eca | 2011-05-14 11:00:52 +0200 | [diff] [blame] | 620 | if (!newtbl) |
| 621 | goto out; |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 622 | if (mesh_table_grow(oldtbl, newtbl) < 0) { |
cozybit Inc | a3e6b12 | 2011-04-13 11:10:28 -0700 | [diff] [blame] | 623 | __mesh_table_free(newtbl); |
Johannes Berg | 1928eca | 2011-05-14 11:00:52 +0200 | [diff] [blame] | 624 | goto out; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 625 | } |
| 626 | rcu_assign_pointer(mpp_paths, newtbl); |
Johannes Berg | 1928eca | 2011-05-14 11:00:52 +0200 | [diff] [blame] | 627 | call_rcu(&oldtbl->rcu_head, mesh_table_free_rcu); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 628 | |
Johannes Berg | 1928eca | 2011-05-14 11:00:52 +0200 | [diff] [blame] | 629 | out: |
| 630 | write_unlock_bh(&pathtbl_resize_lock); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 631 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 632 | |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 633 | int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata) |
| 634 | { |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 635 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
| 636 | struct ieee80211_local *local = sdata->local; |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 637 | struct mesh_table *tbl; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 638 | struct mesh_path *mpath, *new_mpath; |
| 639 | struct mpath_node *node, *new_node; |
| 640 | struct hlist_head *bucket; |
| 641 | struct hlist_node *n; |
| 642 | int grow = 0; |
| 643 | int err = 0; |
| 644 | u32 hash_idx; |
| 645 | |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 646 | if (ether_addr_equal(dst, sdata->vif.addr)) |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 647 | /* never add ourselves as neighbours */ |
| 648 | return -ENOTSUPP; |
| 649 | |
| 650 | if (is_multicast_ether_addr(dst)) |
| 651 | return -ENOTSUPP; |
| 652 | |
| 653 | err = -ENOMEM; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 654 | new_mpath = kzalloc(sizeof(struct mesh_path), GFP_ATOMIC); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 655 | if (!new_mpath) |
| 656 | goto err_path_alloc; |
| 657 | |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 658 | new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 659 | if (!new_node) |
| 660 | goto err_node_alloc; |
| 661 | |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 662 | read_lock_bh(&pathtbl_resize_lock); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 663 | memcpy(new_mpath->dst, dst, ETH_ALEN); |
| 664 | memcpy(new_mpath->mpp, mpp, ETH_ALEN); |
| 665 | new_mpath->sdata = sdata; |
| 666 | new_mpath->flags = 0; |
| 667 | skb_queue_head_init(&new_mpath->frame_queue); |
| 668 | new_node->mpath = new_mpath; |
Thomas Pedersen | c6133661 | 2011-08-25 10:36:14 -0700 | [diff] [blame] | 669 | init_timer(&new_mpath->timer); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 670 | new_mpath->exp_time = jiffies; |
| 671 | spin_lock_init(&new_mpath->state_lock); |
| 672 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 673 | tbl = resize_dereference_mpp_paths(); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 674 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 675 | hash_idx = mesh_table_hash(dst, sdata, tbl); |
| 676 | bucket = &tbl->hash_buckets[hash_idx]; |
| 677 | |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 678 | spin_lock(&tbl->hashwlock[hash_idx]); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 679 | |
| 680 | err = -EEXIST; |
| 681 | hlist_for_each_entry(node, n, bucket, list) { |
| 682 | mpath = node->mpath; |
Felix Fietkau | 888d04d | 2012-03-01 15:22:09 +0100 | [diff] [blame] | 683 | if (mpath->sdata == sdata && |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 684 | ether_addr_equal(dst, mpath->dst)) |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 685 | goto err_exists; |
| 686 | } |
| 687 | |
| 688 | hlist_add_head_rcu(&new_node->list, bucket); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 689 | if (atomic_inc_return(&tbl->entries) >= |
| 690 | tbl->mean_chain_len * (tbl->hash_mask + 1)) |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 691 | grow = 1; |
| 692 | |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 693 | spin_unlock(&tbl->hashwlock[hash_idx]); |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 694 | read_unlock_bh(&pathtbl_resize_lock); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 695 | if (grow) { |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 696 | set_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags); |
Johannes Berg | 64592c8 | 2010-06-10 10:21:31 +0200 | [diff] [blame] | 697 | ieee80211_queue_work(&local->hw, &sdata->work); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 698 | } |
| 699 | return 0; |
| 700 | |
| 701 | err_exists: |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 702 | spin_unlock(&tbl->hashwlock[hash_idx]); |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 703 | read_unlock_bh(&pathtbl_resize_lock); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 704 | kfree(new_node); |
| 705 | err_node_alloc: |
| 706 | kfree(new_mpath); |
| 707 | err_path_alloc: |
| 708 | return err; |
| 709 | } |
| 710 | |
| 711 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 712 | /** |
| 713 | * mesh_plink_broken - deactivates paths and sends perr when a link breaks |
| 714 | * |
| 715 | * @sta: broken peer link |
| 716 | * |
| 717 | * This function must be called from the rate control algorithm if enough |
| 718 | * delivery errors suggest that a peer link is no longer usable. |
| 719 | */ |
| 720 | void mesh_plink_broken(struct sta_info *sta) |
| 721 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 722 | struct mesh_table *tbl; |
Johannes Berg | 15ff636 | 2009-11-17 13:34:04 +0100 | [diff] [blame] | 723 | static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 724 | struct mesh_path *mpath; |
| 725 | struct mpath_node *node; |
| 726 | struct hlist_node *p; |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 727 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 728 | int i; |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 729 | __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_DEST_UNREACHABLE); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 730 | |
| 731 | rcu_read_lock(); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 732 | tbl = rcu_dereference(mesh_paths); |
| 733 | for_each_mesh_entry(tbl, p, node, i) { |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 734 | mpath = node->mpath; |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 735 | if (rcu_dereference(mpath->next_hop) == sta && |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 736 | mpath->flags & MESH_PATH_ACTIVE && |
| 737 | !(mpath->flags & MESH_PATH_FIXED)) { |
Javier Cardona | f5e50cd | 2011-08-29 13:23:05 -0700 | [diff] [blame] | 738 | spin_lock_bh(&mpath->state_lock); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 739 | mpath->flags &= ~MESH_PATH_ACTIVE; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 740 | ++mpath->sn; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 741 | spin_unlock_bh(&mpath->state_lock); |
Javier Cardona | 45904f2 | 2010-12-03 09:20:40 +0100 | [diff] [blame] | 742 | mesh_path_error_tx(sdata->u.mesh.mshcfg.element_ttl, |
| 743 | mpath->dst, cpu_to_le32(mpath->sn), |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 744 | reason, bcast, sdata); |
Javier Cardona | f5e50cd | 2011-08-29 13:23:05 -0700 | [diff] [blame] | 745 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 746 | } |
| 747 | rcu_read_unlock(); |
| 748 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 749 | |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 750 | static void mesh_path_node_reclaim(struct rcu_head *rp) |
| 751 | { |
| 752 | struct mpath_node *node = container_of(rp, struct mpath_node, rcu); |
| 753 | struct ieee80211_sub_if_data *sdata = node->mpath->sdata; |
| 754 | |
| 755 | del_timer_sync(&node->mpath->timer); |
| 756 | atomic_dec(&sdata->u.mesh.mpaths); |
| 757 | kfree(node->mpath); |
| 758 | kfree(node); |
| 759 | } |
| 760 | |
| 761 | /* needs to be called with the corresponding hashwlock taken */ |
| 762 | static void __mesh_path_del(struct mesh_table *tbl, struct mpath_node *node) |
| 763 | { |
| 764 | struct mesh_path *mpath; |
| 765 | mpath = node->mpath; |
| 766 | spin_lock(&mpath->state_lock); |
| 767 | mpath->flags |= MESH_PATH_RESOLVING; |
| 768 | if (mpath->is_gate) |
| 769 | mesh_gate_del(tbl, mpath); |
| 770 | hlist_del_rcu(&node->list); |
| 771 | call_rcu(&node->rcu, mesh_path_node_reclaim); |
| 772 | spin_unlock(&mpath->state_lock); |
| 773 | atomic_dec(&tbl->entries); |
| 774 | } |
| 775 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 776 | /** |
| 777 | * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches |
| 778 | * |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 779 | * @sta: mesh peer to match |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 780 | * |
Luis Carlos Cobo | b4e08ea | 2008-02-29 15:46:08 -0800 | [diff] [blame] | 781 | * RCU notes: this function is called when a mesh plink transitions from |
| 782 | * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that |
| 783 | * allows path creation. This will happen before the sta can be freed (because |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 784 | * sta_info_destroy() calls this) so any reader in a rcu read block will be |
| 785 | * protected against the plink disappearing. |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 786 | */ |
| 787 | void mesh_path_flush_by_nexthop(struct sta_info *sta) |
| 788 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 789 | struct mesh_table *tbl; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 790 | struct mesh_path *mpath; |
| 791 | struct mpath_node *node; |
| 792 | struct hlist_node *p; |
| 793 | int i; |
| 794 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 795 | rcu_read_lock(); |
Javier Cardona | 239289e | 2011-08-29 13:23:09 -0700 | [diff] [blame] | 796 | read_lock_bh(&pathtbl_resize_lock); |
| 797 | tbl = resize_dereference_mesh_paths(); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 798 | for_each_mesh_entry(tbl, p, node, i) { |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 799 | mpath = node->mpath; |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 800 | if (rcu_dereference(mpath->next_hop) == sta) { |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 801 | spin_lock(&tbl->hashwlock[i]); |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 802 | __mesh_path_del(tbl, node); |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 803 | spin_unlock(&tbl->hashwlock[i]); |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 804 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 805 | } |
Javier Cardona | 239289e | 2011-08-29 13:23:09 -0700 | [diff] [blame] | 806 | read_unlock_bh(&pathtbl_resize_lock); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 807 | rcu_read_unlock(); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 808 | } |
| 809 | |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 810 | static void table_flush_by_iface(struct mesh_table *tbl, |
| 811 | struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 812 | { |
| 813 | struct mesh_path *mpath; |
| 814 | struct mpath_node *node; |
| 815 | struct hlist_node *p; |
| 816 | int i; |
| 817 | |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 818 | WARN_ON(!rcu_read_lock_held()); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 819 | for_each_mesh_entry(tbl, p, node, i) { |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 820 | mpath = node->mpath; |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 821 | if (mpath->sdata != sdata) |
| 822 | continue; |
Javier Cardona | ece1a2e | 2011-08-29 13:23:04 -0700 | [diff] [blame] | 823 | spin_lock_bh(&tbl->hashwlock[i]); |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 824 | __mesh_path_del(tbl, node); |
Javier Cardona | ece1a2e | 2011-08-29 13:23:04 -0700 | [diff] [blame] | 825 | spin_unlock_bh(&tbl->hashwlock[i]); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 826 | } |
| 827 | } |
| 828 | |
Javier Cardona | ece1a2e | 2011-08-29 13:23:04 -0700 | [diff] [blame] | 829 | /** |
| 830 | * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface |
| 831 | * |
| 832 | * This function deletes both mesh paths as well as mesh portal paths. |
| 833 | * |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 834 | * @sdata: interface data to match |
Javier Cardona | ece1a2e | 2011-08-29 13:23:04 -0700 | [diff] [blame] | 835 | * |
| 836 | */ |
| 837 | void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 838 | { |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 839 | struct mesh_table *tbl; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 840 | |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 841 | rcu_read_lock(); |
Javier Cardona | 239289e | 2011-08-29 13:23:09 -0700 | [diff] [blame] | 842 | read_lock_bh(&pathtbl_resize_lock); |
| 843 | tbl = resize_dereference_mesh_paths(); |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 844 | table_flush_by_iface(tbl, sdata); |
Javier Cardona | 239289e | 2011-08-29 13:23:09 -0700 | [diff] [blame] | 845 | tbl = resize_dereference_mpp_paths(); |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 846 | table_flush_by_iface(tbl, sdata); |
Javier Cardona | 239289e | 2011-08-29 13:23:09 -0700 | [diff] [blame] | 847 | read_unlock_bh(&pathtbl_resize_lock); |
Javier Cardona | cd72e81 | 2011-08-29 13:23:08 -0700 | [diff] [blame] | 848 | rcu_read_unlock(); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 849 | } |
| 850 | |
| 851 | /** |
| 852 | * mesh_path_del - delete a mesh path from the table |
| 853 | * |
| 854 | * @addr: dst address (ETH_ALEN length) |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 855 | * @sdata: local subif |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 856 | * |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 857 | * Returns: 0 if successful |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 858 | */ |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 859 | int mesh_path_del(u8 *addr, struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 860 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 861 | struct mesh_table *tbl; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 862 | struct mesh_path *mpath; |
| 863 | struct mpath_node *node; |
| 864 | struct hlist_head *bucket; |
| 865 | struct hlist_node *n; |
| 866 | int hash_idx; |
| 867 | int err = 0; |
| 868 | |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 869 | read_lock_bh(&pathtbl_resize_lock); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 870 | tbl = resize_dereference_mesh_paths(); |
| 871 | hash_idx = mesh_table_hash(addr, sdata, tbl); |
| 872 | bucket = &tbl->hash_buckets[hash_idx]; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 873 | |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 874 | spin_lock(&tbl->hashwlock[hash_idx]); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 875 | hlist_for_each_entry(node, n, bucket, list) { |
| 876 | mpath = node->mpath; |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 877 | if (mpath->sdata == sdata && |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 878 | ether_addr_equal(addr, mpath->dst)) { |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 879 | __mesh_path_del(tbl, node); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 880 | goto enddel; |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | err = -ENXIO; |
| 885 | enddel: |
Johannes Berg | f5ea912 | 2009-08-07 16:17:38 +0200 | [diff] [blame] | 886 | mesh_paths_generation++; |
Thomas Pedersen | f06c788 | 2012-03-06 16:42:09 -0800 | [diff] [blame] | 887 | spin_unlock(&tbl->hashwlock[hash_idx]); |
Javier Cardona | 9b84b808 | 2011-05-03 16:57:16 -0700 | [diff] [blame] | 888 | read_unlock_bh(&pathtbl_resize_lock); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 889 | return err; |
| 890 | } |
| 891 | |
| 892 | /** |
| 893 | * mesh_path_tx_pending - sends pending frames in a mesh path queue |
| 894 | * |
| 895 | * @mpath: mesh path to activate |
| 896 | * |
| 897 | * Locking: the state_lock of the mpath structure must NOT be held when calling |
| 898 | * this function. |
| 899 | */ |
| 900 | void mesh_path_tx_pending(struct mesh_path *mpath) |
| 901 | { |
Javier Cardona | 249b405 | 2009-07-07 10:55:03 -0700 | [diff] [blame] | 902 | if (mpath->flags & MESH_PATH_ACTIVE) |
| 903 | ieee80211_add_pending_skbs(mpath->sdata->local, |
| 904 | &mpath->frame_queue); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 905 | } |
| 906 | |
| 907 | /** |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 908 | * mesh_path_send_to_gates - sends pending frames to all known mesh gates |
| 909 | * |
| 910 | * @mpath: mesh path whose queue will be emptied |
| 911 | * |
| 912 | * If there is only one gate, the frames are transferred from the failed mpath |
| 913 | * queue to that gate's queue. If there are more than one gates, the frames |
| 914 | * are copied from each gate to the next. After frames are copied, the |
| 915 | * mpath queues are emptied onto the transmission queue. |
| 916 | */ |
| 917 | int mesh_path_send_to_gates(struct mesh_path *mpath) |
| 918 | { |
| 919 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
| 920 | struct hlist_node *n; |
| 921 | struct mesh_table *tbl; |
| 922 | struct mesh_path *from_mpath = mpath; |
| 923 | struct mpath_node *gate = NULL; |
| 924 | bool copy = false; |
| 925 | struct hlist_head *known_gates; |
| 926 | |
| 927 | rcu_read_lock(); |
| 928 | tbl = rcu_dereference(mesh_paths); |
| 929 | known_gates = tbl->known_gates; |
| 930 | rcu_read_unlock(); |
| 931 | |
| 932 | if (!known_gates) |
| 933 | return -EHOSTUNREACH; |
| 934 | |
| 935 | hlist_for_each_entry_rcu(gate, n, known_gates, list) { |
| 936 | if (gate->mpath->sdata != sdata) |
| 937 | continue; |
| 938 | |
| 939 | if (gate->mpath->flags & MESH_PATH_ACTIVE) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 940 | mpath_dbg(sdata, "Forwarding to %pM\n", gate->mpath->dst); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 941 | mesh_path_move_to_queue(gate->mpath, from_mpath, copy); |
| 942 | from_mpath = gate->mpath; |
| 943 | copy = true; |
| 944 | } else { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 945 | mpath_dbg(sdata, |
| 946 | "Not forwarding %p (flags %#x)\n", |
| 947 | gate->mpath, gate->mpath->flags); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 948 | } |
| 949 | } |
| 950 | |
| 951 | hlist_for_each_entry_rcu(gate, n, known_gates, list) |
| 952 | if (gate->mpath->sdata == sdata) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 953 | mpath_dbg(sdata, "Sending to %pM\n", gate->mpath->dst); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 954 | mesh_path_tx_pending(gate->mpath); |
| 955 | } |
| 956 | |
| 957 | return (from_mpath == mpath) ? -EHOSTUNREACH : 0; |
| 958 | } |
| 959 | |
| 960 | /** |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 961 | * mesh_path_discard_frame - discard a frame whose path could not be resolved |
| 962 | * |
| 963 | * @skb: frame to discard |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 964 | * @sdata: network subif the frame was to be sent through |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 965 | * |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 966 | * Locking: the function must me called within a rcu_read_lock region |
| 967 | */ |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 968 | void mesh_path_discard_frame(struct sk_buff *skb, |
| 969 | struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 970 | { |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 971 | kfree_skb(skb); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 972 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 973 | } |
| 974 | |
| 975 | /** |
| 976 | * mesh_path_flush_pending - free the pending queue of a mesh path |
| 977 | * |
| 978 | * @mpath: mesh path whose queue has to be freed |
| 979 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 980 | * Locking: the function must me called within a rcu_read_lock region |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 981 | */ |
| 982 | void mesh_path_flush_pending(struct mesh_path *mpath) |
| 983 | { |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 984 | struct sk_buff *skb; |
| 985 | |
Javier Cardona | 00e3f25 | 2011-08-09 16:45:07 -0700 | [diff] [blame] | 986 | while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 987 | mesh_path_discard_frame(skb, mpath->sdata); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 988 | } |
| 989 | |
| 990 | /** |
| 991 | * mesh_path_fix_nexthop - force a specific next hop for a mesh path |
| 992 | * |
| 993 | * @mpath: the mesh path to modify |
| 994 | * @next_hop: the next hop to force |
| 995 | * |
| 996 | * Locking: this function must be called holding mpath->state_lock |
| 997 | */ |
| 998 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) |
| 999 | { |
| 1000 | spin_lock_bh(&mpath->state_lock); |
| 1001 | mesh_path_assign_nexthop(mpath, next_hop); |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 1002 | mpath->sn = 0xffff; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1003 | mpath->metric = 0; |
| 1004 | mpath->hop_count = 0; |
| 1005 | mpath->exp_time = 0; |
| 1006 | mpath->flags |= MESH_PATH_FIXED; |
| 1007 | mesh_path_activate(mpath); |
| 1008 | spin_unlock_bh(&mpath->state_lock); |
| 1009 | mesh_path_tx_pending(mpath); |
| 1010 | } |
| 1011 | |
| 1012 | static void mesh_path_node_free(struct hlist_node *p, bool free_leafs) |
| 1013 | { |
| 1014 | struct mesh_path *mpath; |
| 1015 | struct mpath_node *node = hlist_entry(p, struct mpath_node, list); |
| 1016 | mpath = node->mpath; |
| 1017 | hlist_del_rcu(p); |
Javier Cardona | d0df9ee | 2011-05-13 14:16:07 -0700 | [diff] [blame] | 1018 | if (free_leafs) { |
| 1019 | del_timer_sync(&mpath->timer); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1020 | kfree(mpath); |
Javier Cardona | d0df9ee | 2011-05-13 14:16:07 -0700 | [diff] [blame] | 1021 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1022 | kfree(node); |
| 1023 | } |
| 1024 | |
Pavel Emelyanov | 4caf86c | 2008-05-07 19:47:01 +0400 | [diff] [blame] | 1025 | static int mesh_path_node_copy(struct hlist_node *p, struct mesh_table *newtbl) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1026 | { |
| 1027 | struct mesh_path *mpath; |
| 1028 | struct mpath_node *node, *new_node; |
| 1029 | u32 hash_idx; |
| 1030 | |
Pavel Emelyanov | 8566dc3 | 2008-05-07 19:51:51 +0400 | [diff] [blame] | 1031 | new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC); |
Pavel Emelyanov | 00242c4 | 2008-05-07 19:48:14 +0400 | [diff] [blame] | 1032 | if (new_node == NULL) |
| 1033 | return -ENOMEM; |
| 1034 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1035 | node = hlist_entry(p, struct mpath_node, list); |
| 1036 | mpath = node->mpath; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1037 | new_node->mpath = mpath; |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 1038 | hash_idx = mesh_table_hash(mpath->dst, mpath->sdata, newtbl); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1039 | hlist_add_head(&new_node->list, |
| 1040 | &newtbl->hash_buckets[hash_idx]); |
Pavel Emelyanov | 4caf86c | 2008-05-07 19:47:01 +0400 | [diff] [blame] | 1041 | return 0; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1042 | } |
| 1043 | |
| 1044 | int mesh_pathtbl_init(void) |
| 1045 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1046 | struct mesh_table *tbl_path, *tbl_mpp; |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 1047 | int ret; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1048 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1049 | tbl_path = mesh_table_alloc(INIT_PATHS_SIZE_ORDER); |
| 1050 | if (!tbl_path) |
| 1051 | return -ENOMEM; |
| 1052 | tbl_path->free_node = &mesh_path_node_free; |
| 1053 | tbl_path->copy_node = &mesh_path_node_copy; |
| 1054 | tbl_path->mean_chain_len = MEAN_CHAIN_LEN; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1055 | tbl_path->known_gates = kzalloc(sizeof(struct hlist_head), GFP_ATOMIC); |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 1056 | if (!tbl_path->known_gates) { |
| 1057 | ret = -ENOMEM; |
| 1058 | goto free_path; |
| 1059 | } |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1060 | INIT_HLIST_HEAD(tbl_path->known_gates); |
| 1061 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1062 | |
| 1063 | tbl_mpp = mesh_table_alloc(INIT_PATHS_SIZE_ORDER); |
| 1064 | if (!tbl_mpp) { |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 1065 | ret = -ENOMEM; |
| 1066 | goto free_path; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1067 | } |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1068 | tbl_mpp->free_node = &mesh_path_node_free; |
| 1069 | tbl_mpp->copy_node = &mesh_path_node_copy; |
| 1070 | tbl_mpp->mean_chain_len = MEAN_CHAIN_LEN; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1071 | tbl_mpp->known_gates = kzalloc(sizeof(struct hlist_head), GFP_ATOMIC); |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 1072 | if (!tbl_mpp->known_gates) { |
| 1073 | ret = -ENOMEM; |
| 1074 | goto free_mpp; |
| 1075 | } |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1076 | INIT_HLIST_HEAD(tbl_mpp->known_gates); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1077 | |
| 1078 | /* Need no locking since this is during init */ |
| 1079 | RCU_INIT_POINTER(mesh_paths, tbl_path); |
| 1080 | RCU_INIT_POINTER(mpp_paths, tbl_mpp); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1081 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1082 | return 0; |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 1083 | |
| 1084 | free_mpp: |
| 1085 | mesh_table_free(tbl_mpp, true); |
| 1086 | free_path: |
| 1087 | mesh_table_free(tbl_path, true); |
| 1088 | return ret; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1089 | } |
| 1090 | |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 1091 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1092 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1093 | struct mesh_table *tbl; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1094 | struct mesh_path *mpath; |
| 1095 | struct mpath_node *node; |
| 1096 | struct hlist_node *p; |
| 1097 | int i; |
| 1098 | |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1099 | rcu_read_lock(); |
| 1100 | tbl = rcu_dereference(mesh_paths); |
| 1101 | for_each_mesh_entry(tbl, p, node, i) { |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 1102 | if (node->mpath->sdata != sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1103 | continue; |
| 1104 | mpath = node->mpath; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1105 | if ((!(mpath->flags & MESH_PATH_RESOLVING)) && |
| 1106 | (!(mpath->flags & MESH_PATH_FIXED)) && |
Javier Cardona | f5e50cd | 2011-08-29 13:23:05 -0700 | [diff] [blame] | 1107 | time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 1108 | mesh_path_del(mpath->dst, mpath->sdata); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1109 | } |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1110 | rcu_read_unlock(); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1111 | } |
| 1112 | |
| 1113 | void mesh_pathtbl_unregister(void) |
| 1114 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 1115 | /* no need for locking during exit path */ |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 1116 | mesh_table_free(rcu_dereference_protected(mesh_paths, 1), true); |
| 1117 | mesh_table_free(rcu_dereference_protected(mpp_paths, 1), true); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 1118 | } |