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 | |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 21 | static void mesh_path_free_rcu(struct mesh_table *tbl, struct mesh_path *mpath); |
| 22 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 23 | static u32 mesh_table_hash(const void *addr, u32 len, u32 seed) |
| 24 | { |
| 25 | /* Use last four bytes of hw addr as hash index */ |
| 26 | return jhash_1word(*(u32 *)(addr+2), seed); |
| 27 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 28 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 29 | static const struct rhashtable_params mesh_rht_params = { |
| 30 | .nelem_hint = 2, |
| 31 | .automatic_shrinking = true, |
| 32 | .key_len = ETH_ALEN, |
| 33 | .key_offset = offsetof(struct mesh_path, dst), |
| 34 | .head_offset = offsetof(struct mesh_path, rhash), |
| 35 | .hashfn = mesh_table_hash, |
| 36 | }; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 37 | |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 38 | static inline bool mpath_expired(struct mesh_path *mpath) |
| 39 | { |
| 40 | return (mpath->flags & MESH_PATH_ACTIVE) && |
| 41 | time_after(jiffies, mpath->exp_time) && |
| 42 | !(mpath->flags & MESH_PATH_FIXED); |
| 43 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 44 | |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 45 | static void mesh_path_rht_free(void *ptr, void *tblptr) |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 46 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 47 | struct mesh_path *mpath = ptr; |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 48 | struct mesh_table *tbl = tblptr; |
| 49 | |
| 50 | mesh_path_free_rcu(tbl, mpath); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 51 | } |
| 52 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 53 | static struct mesh_table *mesh_table_alloc(void) |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 54 | { |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 55 | struct mesh_table *newtbl; |
| 56 | |
Javier Cardona | d676ff4 | 2011-05-17 16:13:34 -0700 | [diff] [blame] | 57 | newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC); |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 58 | if (!newtbl) |
| 59 | return NULL; |
| 60 | |
Bob Copeland | 18b27ff | 2016-03-18 22:11:30 -0400 | [diff] [blame] | 61 | INIT_HLIST_HEAD(&newtbl->known_gates); |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 62 | atomic_set(&newtbl->entries, 0); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 63 | spin_lock_init(&newtbl->gates_lock); |
Johannes Berg | 6b86bd6 | 2011-05-12 13:38:50 +0200 | [diff] [blame] | 64 | |
| 65 | return newtbl; |
| 66 | } |
| 67 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 68 | static void mesh_table_free(struct mesh_table *tbl) |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 69 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 70 | rhashtable_free_and_destroy(&tbl->rhead, |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 71 | mesh_path_rht_free, tbl); |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 72 | kfree(tbl); |
| 73 | } |
| 74 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 75 | /** |
| 76 | * |
| 77 | * mesh_path_assign_nexthop - update mesh path next hop |
| 78 | * |
| 79 | * @mpath: mesh path to update |
| 80 | * @sta: next hop to assign |
| 81 | * |
| 82 | * Locking: mpath->state_lock must be held when calling this function |
| 83 | */ |
| 84 | void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta) |
| 85 | { |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 86 | struct sk_buff *skb; |
| 87 | struct ieee80211_hdr *hdr; |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 88 | unsigned long flags; |
| 89 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 90 | rcu_assign_pointer(mpath->next_hop, sta); |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 91 | |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 92 | spin_lock_irqsave(&mpath->frame_queue.lock, flags); |
Thomas Pedersen | b22bd52 | 2012-08-09 18:15:39 -0700 | [diff] [blame] | 93 | skb_queue_walk(&mpath->frame_queue, skb) { |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 94 | hdr = (struct ieee80211_hdr *) skb->data; |
| 95 | memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); |
Thomas Pedersen | 7e3c886 | 2011-11-24 17:15:21 -0800 | [diff] [blame] | 96 | memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN); |
Marco Porsch | 3f52b7e | 2013-01-30 18:14:08 +0100 | [diff] [blame] | 97 | ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr); |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Javier Cardona | 10c836d | 2009-07-09 14:42:16 -0700 | [diff] [blame] | 100 | spin_unlock_irqrestore(&mpath->frame_queue.lock, flags); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 101 | } |
| 102 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 103 | static void prepare_for_gate(struct sk_buff *skb, char *dst_addr, |
| 104 | struct mesh_path *gate_mpath) |
| 105 | { |
| 106 | struct ieee80211_hdr *hdr; |
| 107 | struct ieee80211s_hdr *mshdr; |
| 108 | int mesh_hdrlen, hdrlen; |
| 109 | char *next_hop; |
| 110 | |
| 111 | hdr = (struct ieee80211_hdr *) skb->data; |
| 112 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 113 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| 114 | |
| 115 | if (!(mshdr->flags & MESH_FLAGS_AE)) { |
| 116 | /* size of the fixed part of the mesh header */ |
| 117 | mesh_hdrlen = 6; |
| 118 | |
| 119 | /* make room for the two extended addresses */ |
| 120 | skb_push(skb, 2 * ETH_ALEN); |
| 121 | memmove(skb->data, hdr, hdrlen + mesh_hdrlen); |
| 122 | |
| 123 | hdr = (struct ieee80211_hdr *) skb->data; |
| 124 | |
| 125 | /* we preserve the previous mesh header and only add |
| 126 | * the new addreses */ |
| 127 | mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| 128 | mshdr->flags = MESH_FLAGS_AE_A5_A6; |
| 129 | memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN); |
| 130 | memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN); |
| 131 | } |
| 132 | |
| 133 | /* update next hop */ |
| 134 | hdr = (struct ieee80211_hdr *) skb->data; |
| 135 | rcu_read_lock(); |
| 136 | next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr; |
| 137 | memcpy(hdr->addr1, next_hop, ETH_ALEN); |
| 138 | rcu_read_unlock(); |
Thomas Pedersen | 7e3c886 | 2011-11-24 17:15:21 -0800 | [diff] [blame] | 139 | memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 140 | memcpy(hdr->addr3, dst_addr, ETH_ALEN); |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * |
| 145 | * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another |
| 146 | * |
| 147 | * This function is used to transfer or copy frames from an unresolved mpath to |
| 148 | * a gate mpath. The function also adds the Address Extension field and |
| 149 | * updates the next hop. |
| 150 | * |
| 151 | * If a frame already has an Address Extension field, only the next hop and |
| 152 | * destination addresses are updated. |
| 153 | * |
| 154 | * The gate mpath must be an active mpath with a valid mpath->next_hop. |
| 155 | * |
| 156 | * @mpath: An active mpath the frames will be sent to (i.e. the gate) |
| 157 | * @from_mpath: The failed mpath |
| 158 | * @copy: When true, copy all the frames to the new mpath queue. When false, |
| 159 | * move them. |
| 160 | */ |
| 161 | static void mesh_path_move_to_queue(struct mesh_path *gate_mpath, |
| 162 | struct mesh_path *from_mpath, |
| 163 | bool copy) |
| 164 | { |
Thomas Pedersen | 4bd4c2d | 2012-08-09 18:15:40 -0700 | [diff] [blame] | 165 | struct sk_buff *skb, *fskb, *tmp; |
| 166 | struct sk_buff_head failq; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 167 | unsigned long flags; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 168 | |
Johannes Berg | 8c5bb1f | 2014-04-29 17:55:26 +0200 | [diff] [blame] | 169 | if (WARN_ON(gate_mpath == from_mpath)) |
| 170 | return; |
| 171 | if (WARN_ON(!gate_mpath->next_hop)) |
| 172 | return; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 173 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 174 | __skb_queue_head_init(&failq); |
| 175 | |
| 176 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); |
| 177 | skb_queue_splice_init(&from_mpath->frame_queue, &failq); |
| 178 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); |
| 179 | |
Thomas Pedersen | 4bd4c2d | 2012-08-09 18:15:40 -0700 | [diff] [blame] | 180 | skb_queue_walk_safe(&failq, fskb, tmp) { |
| 181 | if (skb_queue_len(&gate_mpath->frame_queue) >= |
| 182 | MESH_FRAME_QUEUE_LEN) { |
| 183 | mpath_dbg(gate_mpath->sdata, "mpath queue full!\n"); |
| 184 | break; |
John W. Linville | 817a53d | 2011-08-24 15:12:41 -0400 | [diff] [blame] | 185 | } |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 186 | |
Thomas Pedersen | 4bd4c2d | 2012-08-09 18:15:40 -0700 | [diff] [blame] | 187 | skb = skb_copy(fskb, GFP_ATOMIC); |
| 188 | if (WARN_ON(!skb)) |
| 189 | break; |
| 190 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 191 | prepare_for_gate(skb, gate_mpath->dst, gate_mpath); |
Thomas Pedersen | 4bd4c2d | 2012-08-09 18:15:40 -0700 | [diff] [blame] | 192 | skb_queue_tail(&gate_mpath->frame_queue, skb); |
| 193 | |
| 194 | if (copy) |
| 195 | continue; |
| 196 | |
| 197 | __skb_unlink(fskb, &failq); |
| 198 | kfree_skb(fskb); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 199 | } |
| 200 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 201 | mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n", |
| 202 | gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue)); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 203 | |
| 204 | if (!copy) |
| 205 | return; |
| 206 | |
| 207 | spin_lock_irqsave(&from_mpath->frame_queue.lock, flags); |
| 208 | skb_queue_splice(&failq, &from_mpath->frame_queue); |
| 209 | spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags); |
| 210 | } |
| 211 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 212 | |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 213 | static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, |
| 214 | struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 215 | { |
| 216 | struct mesh_path *mpath; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 217 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 218 | mpath = rhashtable_lookup_fast(&tbl->rhead, dst, mesh_rht_params); |
| 219 | |
| 220 | if (mpath && mpath_expired(mpath)) { |
| 221 | spin_lock_bh(&mpath->state_lock); |
| 222 | mpath->flags &= ~MESH_PATH_ACTIVE; |
| 223 | spin_unlock_bh(&mpath->state_lock); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 224 | } |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 225 | return mpath; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 226 | } |
| 227 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 228 | /** |
| 229 | * mesh_path_lookup - look up a path in the mesh path table |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 230 | * @sdata: local subif |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 231 | * @dst: hardware address (ETH_ALEN length) of destination |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 232 | * |
| 233 | * Returns: pointer to the mesh path structure, or NULL if not found |
| 234 | * |
| 235 | * Locking: must be called within a read rcu section. |
| 236 | */ |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 237 | struct mesh_path * |
| 238 | mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 239 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 240 | return mpath_lookup(sdata->u.mesh.mesh_paths, dst, sdata); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 241 | } |
| 242 | |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 243 | struct mesh_path * |
| 244 | mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 245 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 246 | return mpath_lookup(sdata->u.mesh.mpp_paths, dst, sdata); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 247 | } |
| 248 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 249 | static struct mesh_path * |
| 250 | __mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx) |
| 251 | { |
| 252 | int i = 0, ret; |
| 253 | struct mesh_path *mpath = NULL; |
| 254 | struct rhashtable_iter iter; |
| 255 | |
| 256 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); |
| 257 | if (ret) |
| 258 | return NULL; |
| 259 | |
| 260 | ret = rhashtable_walk_start(&iter); |
| 261 | if (ret && ret != -EAGAIN) |
| 262 | goto err; |
| 263 | |
| 264 | while ((mpath = rhashtable_walk_next(&iter))) { |
| 265 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) |
| 266 | continue; |
| 267 | if (IS_ERR(mpath)) |
| 268 | break; |
| 269 | if (i++ == idx) |
| 270 | break; |
| 271 | } |
| 272 | err: |
| 273 | rhashtable_walk_stop(&iter); |
| 274 | rhashtable_walk_exit(&iter); |
| 275 | |
| 276 | if (IS_ERR(mpath) || !mpath) |
| 277 | return NULL; |
| 278 | |
| 279 | if (mpath_expired(mpath)) { |
| 280 | spin_lock_bh(&mpath->state_lock); |
| 281 | mpath->flags &= ~MESH_PATH_ACTIVE; |
| 282 | spin_unlock_bh(&mpath->state_lock); |
| 283 | } |
| 284 | return mpath; |
| 285 | } |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 286 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 287 | /** |
| 288 | * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index |
| 289 | * @idx: index |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 290 | * @sdata: local subif, or NULL for all entries |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 291 | * |
| 292 | * Returns: pointer to the mesh path structure, or NULL if not found. |
| 293 | * |
| 294 | * Locking: must be called within a read rcu section. |
| 295 | */ |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 296 | struct mesh_path * |
| 297 | mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 298 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 299 | return __mesh_path_lookup_by_idx(sdata->u.mesh.mesh_paths, idx); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 300 | } |
| 301 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 302 | /** |
Henning Rogge | a2db2ed | 2014-09-12 08:58:50 +0200 | [diff] [blame] | 303 | * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index |
| 304 | * @idx: index |
| 305 | * @sdata: local subif, or NULL for all entries |
| 306 | * |
| 307 | * Returns: pointer to the proxy path structure, or NULL if not found. |
| 308 | * |
| 309 | * Locking: must be called within a read rcu section. |
| 310 | */ |
| 311 | struct mesh_path * |
| 312 | mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) |
| 313 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 314 | return __mesh_path_lookup_by_idx(sdata->u.mesh.mpp_paths, idx); |
Henning Rogge | a2db2ed | 2014-09-12 08:58:50 +0200 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | /** |
Johannes Berg | 30be52e | 2011-11-21 11:23:50 +0100 | [diff] [blame] | 318 | * mesh_path_add_gate - add the given mpath to a mesh gate to our path table |
| 319 | * @mpath: gate path to add to table |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 320 | */ |
Johannes Berg | 30be52e | 2011-11-21 11:23:50 +0100 | [diff] [blame] | 321 | int mesh_path_add_gate(struct mesh_path *mpath) |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 322 | { |
Johannes Berg | 30be52e | 2011-11-21 11:23:50 +0100 | [diff] [blame] | 323 | struct mesh_table *tbl; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 324 | int err; |
| 325 | |
| 326 | rcu_read_lock(); |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 327 | tbl = mpath->sdata->u.mesh.mesh_paths; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 328 | |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 329 | spin_lock_bh(&mpath->state_lock); |
| 330 | if (mpath->is_gate) { |
| 331 | err = -EEXIST; |
| 332 | spin_unlock_bh(&mpath->state_lock); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 333 | goto err_rcu; |
| 334 | } |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 335 | mpath->is_gate = true; |
| 336 | mpath->sdata->u.mesh.num_gates++; |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 337 | |
| 338 | spin_lock(&tbl->gates_lock); |
Bob Copeland | 18b27ff | 2016-03-18 22:11:30 -0400 | [diff] [blame] | 339 | hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates); |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 340 | spin_unlock(&tbl->gates_lock); |
| 341 | |
| 342 | spin_unlock_bh(&mpath->state_lock); |
| 343 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 344 | mpath_dbg(mpath->sdata, |
| 345 | "Mesh path: Recorded new gate: %pM. %d known gates\n", |
| 346 | mpath->dst, mpath->sdata->u.mesh.num_gates); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 347 | err = 0; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 348 | err_rcu: |
| 349 | rcu_read_unlock(); |
| 350 | return err; |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * mesh_gate_del - remove a mesh gate from the list of known gates |
| 355 | * @tbl: table which holds our list of known gates |
| 356 | * @mpath: gate mpath |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 357 | */ |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 358 | static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath) |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 359 | { |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 360 | lockdep_assert_held(&mpath->state_lock); |
| 361 | if (!mpath->is_gate) |
| 362 | return; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 363 | |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 364 | mpath->is_gate = false; |
| 365 | spin_lock_bh(&tbl->gates_lock); |
| 366 | hlist_del_rcu(&mpath->gate_list); |
| 367 | mpath->sdata->u.mesh.num_gates--; |
| 368 | spin_unlock_bh(&tbl->gates_lock); |
| 369 | |
| 370 | mpath_dbg(mpath->sdata, |
| 371 | "Mesh path: Deleted gate: %pM. %d known gates\n", |
| 372 | mpath->dst, mpath->sdata->u.mesh.num_gates); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | /** |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 376 | * mesh_gate_num - number of gates known to this interface |
| 377 | * @sdata: subif data |
| 378 | */ |
| 379 | int mesh_gate_num(struct ieee80211_sub_if_data *sdata) |
| 380 | { |
| 381 | return sdata->u.mesh.num_gates; |
| 382 | } |
| 383 | |
Bob Copeland | b15dc38 | 2016-02-28 20:03:58 -0500 | [diff] [blame] | 384 | static |
| 385 | struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata, |
| 386 | const u8 *dst, gfp_t gfp_flags) |
| 387 | { |
| 388 | struct mesh_path *new_mpath; |
| 389 | |
| 390 | new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags); |
| 391 | if (!new_mpath) |
| 392 | return NULL; |
| 393 | |
| 394 | memcpy(new_mpath->dst, dst, ETH_ALEN); |
| 395 | eth_broadcast_addr(new_mpath->rann_snd_addr); |
| 396 | new_mpath->is_root = false; |
| 397 | new_mpath->sdata = sdata; |
| 398 | new_mpath->flags = 0; |
| 399 | skb_queue_head_init(&new_mpath->frame_queue); |
| 400 | new_mpath->timer.data = (unsigned long) new_mpath; |
| 401 | new_mpath->timer.function = mesh_path_timer; |
| 402 | new_mpath->exp_time = jiffies; |
| 403 | spin_lock_init(&new_mpath->state_lock); |
| 404 | init_timer(&new_mpath->timer); |
| 405 | |
| 406 | return new_mpath; |
| 407 | } |
| 408 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 409 | /** |
| 410 | * mesh_path_add - allocate and add a new path to the mesh path table |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 411 | * @dst: destination address of the path (ETH_ALEN length) |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 412 | * @sdata: local subif |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 413 | * |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 414 | * Returns: 0 on success |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 415 | * |
| 416 | * State: the initial state of the new path is set to 0 |
| 417 | */ |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 418 | struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, |
| 419 | const u8 *dst) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 420 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 421 | struct mesh_table *tbl; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 422 | struct mesh_path *mpath, *new_mpath; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 423 | int ret; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 424 | |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 425 | if (ether_addr_equal(dst, sdata->vif.addr)) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 426 | /* never add ourselves as neighbours */ |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 427 | return ERR_PTR(-ENOTSUPP); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 428 | |
| 429 | if (is_multicast_ether_addr(dst)) |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 430 | return ERR_PTR(-ENOTSUPP); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 431 | |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 432 | if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0) |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 433 | return ERR_PTR(-ENOSPC); |
| 434 | |
Bob Copeland | b15dc38 | 2016-02-28 20:03:58 -0500 | [diff] [blame] | 435 | new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 436 | if (!new_mpath) |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 437 | return ERR_PTR(-ENOMEM); |
Pavel Emelyanov | 402d775 | 2008-05-06 18:53:43 +0400 | [diff] [blame] | 438 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 439 | tbl = sdata->u.mesh.mesh_paths; |
| 440 | do { |
| 441 | ret = rhashtable_lookup_insert_fast(&tbl->rhead, |
| 442 | &new_mpath->rhash, |
| 443 | mesh_rht_params); |
Pavel Emelyanov | f84e71a | 2008-05-06 18:46:36 +0400 | [diff] [blame] | 444 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 445 | if (ret == -EEXIST) |
| 446 | mpath = rhashtable_lookup_fast(&tbl->rhead, |
| 447 | dst, |
| 448 | mesh_rht_params); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 449 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 450 | } while (unlikely(ret == -EEXIST && !mpath)); |
| 451 | |
Herbert Xu | efbc760 | 2019-02-14 22:03:25 +0800 | [diff] [blame] | 452 | if (ret) { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 453 | kfree(new_mpath); |
Herbert Xu | efbc760 | 2019-02-14 22:03:25 +0800 | [diff] [blame] | 454 | |
| 455 | if (ret != -EEXIST) |
| 456 | return ERR_PTR(ret); |
| 457 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 458 | new_mpath = mpath; |
| 459 | } |
Herbert Xu | efbc760 | 2019-02-14 22:03:25 +0800 | [diff] [blame] | 460 | |
Bob Copeland | 2bdaf38 | 2016-02-28 20:03:56 -0500 | [diff] [blame] | 461 | sdata->u.mesh.mesh_paths_generation++; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 462 | return new_mpath; |
Javier Cardona | 1888923 | 2009-08-10 12:15:52 -0700 | [diff] [blame] | 463 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 464 | |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 465 | int mpp_path_add(struct ieee80211_sub_if_data *sdata, |
| 466 | const u8 *dst, const u8 *mpp) |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 467 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 468 | struct mesh_table *tbl; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 469 | struct mesh_path *new_mpath; |
| 470 | int ret; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 471 | |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 472 | if (ether_addr_equal(dst, sdata->vif.addr)) |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 473 | /* never add ourselves as neighbours */ |
| 474 | return -ENOTSUPP; |
| 475 | |
| 476 | if (is_multicast_ether_addr(dst)) |
| 477 | return -ENOTSUPP; |
| 478 | |
Bob Copeland | b15dc38 | 2016-02-28 20:03:58 -0500 | [diff] [blame] | 479 | new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 480 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 481 | if (!new_mpath) |
| 482 | return -ENOMEM; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 483 | |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 484 | memcpy(new_mpath->mpp, mpp, ETH_ALEN); |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 485 | tbl = sdata->u.mesh.mpp_paths; |
| 486 | ret = rhashtable_lookup_insert_fast(&tbl->rhead, |
| 487 | &new_mpath->rhash, |
| 488 | mesh_rht_params); |
Henning Rogge | a2db2ed | 2014-09-12 08:58:50 +0200 | [diff] [blame] | 489 | |
Herbert Xu | efbc760 | 2019-02-14 22:03:25 +0800 | [diff] [blame] | 490 | if (ret) |
| 491 | kfree(new_mpath); |
| 492 | |
Bob Copeland | 2bdaf38 | 2016-02-28 20:03:56 -0500 | [diff] [blame] | 493 | sdata->u.mesh.mpp_paths_generation++; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 494 | return ret; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 498 | /** |
| 499 | * mesh_plink_broken - deactivates paths and sends perr when a link breaks |
| 500 | * |
| 501 | * @sta: broken peer link |
| 502 | * |
| 503 | * This function must be called from the rate control algorithm if enough |
| 504 | * delivery errors suggest that a peer link is no longer usable. |
| 505 | */ |
| 506 | void mesh_plink_broken(struct sta_info *sta) |
| 507 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 508 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 509 | struct mesh_table *tbl = sdata->u.mesh.mesh_paths; |
Johannes Berg | 15ff636 | 2009-11-17 13:34:04 +0100 | [diff] [blame] | 510 | 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] | 511 | struct mesh_path *mpath; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 512 | struct rhashtable_iter iter; |
| 513 | int ret; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 514 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 515 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); |
| 516 | if (ret) |
| 517 | return; |
| 518 | |
| 519 | ret = rhashtable_walk_start(&iter); |
| 520 | if (ret && ret != -EAGAIN) |
| 521 | goto out; |
| 522 | |
| 523 | while ((mpath = rhashtable_walk_next(&iter))) { |
| 524 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) |
| 525 | continue; |
| 526 | if (IS_ERR(mpath)) |
| 527 | break; |
Andreea-Cristina Bernat | 2688eba | 2014-08-17 16:18:02 +0300 | [diff] [blame] | 528 | if (rcu_access_pointer(mpath->next_hop) == sta && |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 529 | mpath->flags & MESH_PATH_ACTIVE && |
| 530 | !(mpath->flags & MESH_PATH_FIXED)) { |
Javier Cardona | f5e50cd | 2011-08-29 13:23:05 -0700 | [diff] [blame] | 531 | spin_lock_bh(&mpath->state_lock); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 532 | mpath->flags &= ~MESH_PATH_ACTIVE; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 533 | ++mpath->sn; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 534 | spin_unlock_bh(&mpath->state_lock); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 535 | mesh_path_error_tx(sdata, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 536 | sdata->u.mesh.mshcfg.element_ttl, |
| 537 | mpath->dst, mpath->sn, |
| 538 | WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast); |
Javier Cardona | f5e50cd | 2011-08-29 13:23:05 -0700 | [diff] [blame] | 539 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 540 | } |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 541 | out: |
| 542 | rhashtable_walk_stop(&iter); |
| 543 | rhashtable_walk_exit(&iter); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 544 | } |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 545 | |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 546 | static void mesh_path_free_rcu(struct mesh_table *tbl, |
| 547 | struct mesh_path *mpath) |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 548 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 549 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 550 | |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 551 | spin_lock_bh(&mpath->state_lock); |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 552 | mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 553 | mesh_gate_del(tbl, mpath); |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 554 | spin_unlock_bh(&mpath->state_lock); |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 555 | del_timer_sync(&mpath->timer); |
Johannes Berg | c2e703a | 2015-11-17 14:25:21 +0100 | [diff] [blame] | 556 | atomic_dec(&sdata->u.mesh.mpaths); |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 557 | atomic_dec(&tbl->entries); |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 558 | kfree_rcu(mpath, rcu); |
| 559 | } |
| 560 | |
| 561 | static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath) |
| 562 | { |
| 563 | rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params); |
| 564 | mesh_path_free_rcu(tbl, mpath); |
Javier Cardona | 19c50b3 | 2011-08-29 13:23:07 -0700 | [diff] [blame] | 565 | } |
| 566 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 567 | /** |
| 568 | * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches |
| 569 | * |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 570 | * @sta: mesh peer to match |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 571 | * |
Luis Carlos Cobo | b4e08ea | 2008-02-29 15:46:08 -0800 | [diff] [blame] | 572 | * RCU notes: this function is called when a mesh plink transitions from |
| 573 | * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that |
| 574 | * 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] | 575 | * sta_info_destroy() calls this) so any reader in a rcu read block will be |
| 576 | * protected against the plink disappearing. |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 577 | */ |
| 578 | void mesh_path_flush_by_nexthop(struct sta_info *sta) |
| 579 | { |
Bob Copeland | 2bdaf38 | 2016-02-28 20:03:56 -0500 | [diff] [blame] | 580 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 581 | struct mesh_table *tbl = sdata->u.mesh.mesh_paths; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 582 | struct mesh_path *mpath; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 583 | struct rhashtable_iter iter; |
| 584 | int ret; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 585 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 586 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); |
| 587 | if (ret) |
| 588 | return; |
| 589 | |
| 590 | ret = rhashtable_walk_start(&iter); |
| 591 | if (ret && ret != -EAGAIN) |
| 592 | goto out; |
| 593 | |
| 594 | while ((mpath = rhashtable_walk_next(&iter))) { |
| 595 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) |
| 596 | continue; |
| 597 | if (IS_ERR(mpath)) |
| 598 | break; |
| 599 | |
| 600 | if (rcu_access_pointer(mpath->next_hop) == sta) |
| 601 | __mesh_path_del(tbl, mpath); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 602 | } |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 603 | out: |
| 604 | rhashtable_walk_stop(&iter); |
| 605 | rhashtable_walk_exit(&iter); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 606 | } |
| 607 | |
Henning Rogge | bf5a70e | 2016-02-03 13:58:36 +0100 | [diff] [blame] | 608 | static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, |
| 609 | const u8 *proxy) |
| 610 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 611 | struct mesh_table *tbl = sdata->u.mesh.mpp_paths; |
| 612 | struct mesh_path *mpath; |
| 613 | struct rhashtable_iter iter; |
| 614 | int ret; |
Henning Rogge | bf5a70e | 2016-02-03 13:58:36 +0100 | [diff] [blame] | 615 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 616 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); |
| 617 | if (ret) |
| 618 | return; |
| 619 | |
| 620 | ret = rhashtable_walk_start(&iter); |
| 621 | if (ret && ret != -EAGAIN) |
| 622 | goto out; |
| 623 | |
| 624 | while ((mpath = rhashtable_walk_next(&iter))) { |
| 625 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) |
| 626 | continue; |
| 627 | if (IS_ERR(mpath)) |
| 628 | break; |
| 629 | |
| 630 | if (ether_addr_equal(mpath->mpp, proxy)) |
| 631 | __mesh_path_del(tbl, mpath); |
Henning Rogge | bf5a70e | 2016-02-03 13:58:36 +0100 | [diff] [blame] | 632 | } |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 633 | out: |
| 634 | rhashtable_walk_stop(&iter); |
| 635 | rhashtable_walk_exit(&iter); |
Henning Rogge | bf5a70e | 2016-02-03 13:58:36 +0100 | [diff] [blame] | 636 | } |
| 637 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 638 | static void table_flush_by_iface(struct mesh_table *tbl) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 639 | { |
| 640 | struct mesh_path *mpath; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 641 | struct rhashtable_iter iter; |
| 642 | int ret; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 643 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 644 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC); |
| 645 | if (ret) |
| 646 | return; |
| 647 | |
| 648 | ret = rhashtable_walk_start(&iter); |
| 649 | if (ret && ret != -EAGAIN) |
| 650 | goto out; |
| 651 | |
| 652 | while ((mpath = rhashtable_walk_next(&iter))) { |
| 653 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) |
| 654 | continue; |
| 655 | if (IS_ERR(mpath)) |
| 656 | break; |
| 657 | __mesh_path_del(tbl, mpath); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 658 | } |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 659 | out: |
| 660 | rhashtable_walk_stop(&iter); |
| 661 | rhashtable_walk_exit(&iter); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 662 | } |
| 663 | |
Javier Cardona | ece1a2e | 2011-08-29 13:23:04 -0700 | [diff] [blame] | 664 | /** |
| 665 | * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface |
| 666 | * |
| 667 | * This function deletes both mesh paths as well as mesh portal paths. |
| 668 | * |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 669 | * @sdata: interface data to match |
Javier Cardona | ece1a2e | 2011-08-29 13:23:04 -0700 | [diff] [blame] | 670 | * |
| 671 | */ |
| 672 | 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] | 673 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 674 | table_flush_by_iface(sdata->u.mesh.mesh_paths); |
| 675 | table_flush_by_iface(sdata->u.mesh.mpp_paths); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 676 | } |
| 677 | |
| 678 | /** |
Henning Rogge | 4cc955d | 2016-02-03 13:58:38 +0100 | [diff] [blame] | 679 | * table_path_del - delete a path from the mesh or mpp table |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 680 | * |
Henning Rogge | 4cc955d | 2016-02-03 13:58:38 +0100 | [diff] [blame] | 681 | * @tbl: mesh or mpp path table |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 682 | * @sdata: local subif |
Henning Rogge | 4cc955d | 2016-02-03 13:58:38 +0100 | [diff] [blame] | 683 | * @addr: dst address (ETH_ALEN length) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 684 | * |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 685 | * Returns: 0 if successful |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 686 | */ |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 687 | static int table_path_del(struct mesh_table *tbl, |
Henning Rogge | 4cc955d | 2016-02-03 13:58:38 +0100 | [diff] [blame] | 688 | struct ieee80211_sub_if_data *sdata, |
| 689 | const u8 *addr) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 690 | { |
| 691 | struct mesh_path *mpath; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 692 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 693 | rcu_read_lock(); |
| 694 | mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params); |
| 695 | if (!mpath) { |
| 696 | rcu_read_unlock(); |
| 697 | return -ENXIO; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 698 | } |
| 699 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 700 | __mesh_path_del(tbl, mpath); |
| 701 | rcu_read_unlock(); |
| 702 | return 0; |
Henning Rogge | 4cc955d | 2016-02-03 13:58:38 +0100 | [diff] [blame] | 703 | } |
| 704 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 705 | |
Henning Rogge | 4cc955d | 2016-02-03 13:58:38 +0100 | [diff] [blame] | 706 | /** |
| 707 | * mesh_path_del - delete a mesh path from the table |
| 708 | * |
| 709 | * @addr: dst address (ETH_ALEN length) |
| 710 | * @sdata: local subif |
| 711 | * |
| 712 | * Returns: 0 if successful |
| 713 | */ |
| 714 | int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
| 715 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 716 | int err; |
Henning Rogge | 4cc955d | 2016-02-03 13:58:38 +0100 | [diff] [blame] | 717 | |
| 718 | /* flush relevant mpp entries first */ |
| 719 | mpp_flush_by_proxy(sdata, addr); |
| 720 | |
Bob Copeland | 2bdaf38 | 2016-02-28 20:03:56 -0500 | [diff] [blame] | 721 | err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr); |
| 722 | sdata->u.mesh.mesh_paths_generation++; |
Henning Rogge | ab1c790 | 2016-02-03 13:58:37 +0100 | [diff] [blame] | 723 | return err; |
| 724 | } |
| 725 | |
| 726 | /** |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 727 | * mesh_path_tx_pending - sends pending frames in a mesh path queue |
| 728 | * |
| 729 | * @mpath: mesh path to activate |
| 730 | * |
| 731 | * Locking: the state_lock of the mpath structure must NOT be held when calling |
| 732 | * this function. |
| 733 | */ |
| 734 | void mesh_path_tx_pending(struct mesh_path *mpath) |
| 735 | { |
Javier Cardona | 249b405 | 2009-07-07 10:55:03 -0700 | [diff] [blame] | 736 | if (mpath->flags & MESH_PATH_ACTIVE) |
| 737 | ieee80211_add_pending_skbs(mpath->sdata->local, |
| 738 | &mpath->frame_queue); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 739 | } |
| 740 | |
| 741 | /** |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 742 | * mesh_path_send_to_gates - sends pending frames to all known mesh gates |
| 743 | * |
| 744 | * @mpath: mesh path whose queue will be emptied |
| 745 | * |
| 746 | * If there is only one gate, the frames are transferred from the failed mpath |
| 747 | * queue to that gate's queue. If there are more than one gates, the frames |
| 748 | * are copied from each gate to the next. After frames are copied, the |
| 749 | * mpath queues are emptied onto the transmission queue. |
| 750 | */ |
| 751 | int mesh_path_send_to_gates(struct mesh_path *mpath) |
| 752 | { |
| 753 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 754 | struct mesh_table *tbl; |
| 755 | struct mesh_path *from_mpath = mpath; |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 756 | struct mesh_path *gate; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 757 | bool copy = false; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 758 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 759 | tbl = sdata->u.mesh.mesh_paths; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 760 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 761 | rcu_read_lock(); |
Bob Copeland | 18b27ff | 2016-03-18 22:11:30 -0400 | [diff] [blame] | 762 | hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 763 | if (gate->flags & MESH_PATH_ACTIVE) { |
| 764 | mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst); |
| 765 | mesh_path_move_to_queue(gate, from_mpath, copy); |
| 766 | from_mpath = gate; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 767 | copy = true; |
| 768 | } else { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 769 | mpath_dbg(sdata, |
Johannes Berg | d671b2a | 2015-11-06 11:30:46 +0100 | [diff] [blame] | 770 | "Not forwarding to %pM (flags %#x)\n", |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 771 | gate->dst, gate->flags); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 772 | } |
| 773 | } |
| 774 | |
Bob Copeland | 18b27ff | 2016-03-18 22:11:30 -0400 | [diff] [blame] | 775 | hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) { |
Bob Copeland | 947c2a0 | 2016-02-28 20:03:59 -0500 | [diff] [blame] | 776 | mpath_dbg(sdata, "Sending to %pM\n", gate->dst); |
| 777 | mesh_path_tx_pending(gate); |
Bob Copeland | 2bdaf38 | 2016-02-28 20:03:56 -0500 | [diff] [blame] | 778 | } |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 779 | rcu_read_unlock(); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 780 | |
| 781 | return (from_mpath == mpath) ? -EHOSTUNREACH : 0; |
| 782 | } |
| 783 | |
| 784 | /** |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 785 | * mesh_path_discard_frame - discard a frame whose path could not be resolved |
| 786 | * |
| 787 | * @skb: frame to discard |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 788 | * @sdata: network subif the frame was to be sent through |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 789 | * |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 790 | * Locking: the function must me called within a rcu_read_lock region |
| 791 | */ |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 792 | void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, |
| 793 | struct sk_buff *skb) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 794 | { |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 795 | kfree_skb(skb); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 796 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 797 | } |
| 798 | |
| 799 | /** |
| 800 | * mesh_path_flush_pending - free the pending queue of a mesh path |
| 801 | * |
| 802 | * @mpath: mesh path whose queue has to be freed |
| 803 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 804 | * 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] | 805 | */ |
| 806 | void mesh_path_flush_pending(struct mesh_path *mpath) |
| 807 | { |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 808 | struct sk_buff *skb; |
| 809 | |
Javier Cardona | 00e3f25 | 2011-08-09 16:45:07 -0700 | [diff] [blame] | 810 | while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL) |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 811 | mesh_path_discard_frame(mpath->sdata, skb); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 812 | } |
| 813 | |
| 814 | /** |
| 815 | * mesh_path_fix_nexthop - force a specific next hop for a mesh path |
| 816 | * |
| 817 | * @mpath: the mesh path to modify |
| 818 | * @next_hop: the next hop to force |
| 819 | * |
| 820 | * Locking: this function must be called holding mpath->state_lock |
| 821 | */ |
| 822 | void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop) |
| 823 | { |
| 824 | spin_lock_bh(&mpath->state_lock); |
| 825 | mesh_path_assign_nexthop(mpath, next_hop); |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 826 | mpath->sn = 0xffff; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 827 | mpath->metric = 0; |
| 828 | mpath->hop_count = 0; |
| 829 | mpath->exp_time = 0; |
Pedersen, Thomas | 5df20f2 | 2016-09-06 11:59:00 -0700 | [diff] [blame] | 830 | mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 831 | mesh_path_activate(mpath); |
| 832 | spin_unlock_bh(&mpath->state_lock); |
| 833 | mesh_path_tx_pending(mpath); |
| 834 | } |
| 835 | |
Bob Copeland | 2bdaf38 | 2016-02-28 20:03:56 -0500 | [diff] [blame] | 836 | int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 837 | { |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 838 | struct mesh_table *tbl_path, *tbl_mpp; |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 839 | int ret; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 840 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 841 | tbl_path = mesh_table_alloc(); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 842 | if (!tbl_path) |
| 843 | return -ENOMEM; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 844 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 845 | tbl_mpp = mesh_table_alloc(); |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 846 | if (!tbl_mpp) { |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 847 | ret = -ENOMEM; |
| 848 | goto free_path; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 849 | } |
Johannes Berg | 349eb8c | 2011-05-14 11:56:16 +0200 | [diff] [blame] | 850 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 851 | rhashtable_init(&tbl_path->rhead, &mesh_rht_params); |
| 852 | rhashtable_init(&tbl_mpp->rhead, &mesh_rht_params); |
Bob Copeland | 2bdaf38 | 2016-02-28 20:03:56 -0500 | [diff] [blame] | 853 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 854 | sdata->u.mesh.mesh_paths = tbl_path; |
| 855 | sdata->u.mesh.mpp_paths = tbl_mpp; |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 856 | |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 857 | return 0; |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 858 | |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 859 | free_path: |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 860 | mesh_table_free(tbl_path); |
Dan Carpenter | 4c5ade4 | 2011-08-30 22:16:15 +0300 | [diff] [blame] | 861 | return ret; |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 862 | } |
| 863 | |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 864 | static |
| 865 | void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata, |
| 866 | struct mesh_table *tbl) |
| 867 | { |
| 868 | struct mesh_path *mpath; |
| 869 | struct rhashtable_iter iter; |
| 870 | int ret; |
| 871 | |
| 872 | ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_KERNEL); |
| 873 | if (ret) |
| 874 | return; |
| 875 | |
| 876 | ret = rhashtable_walk_start(&iter); |
| 877 | if (ret && ret != -EAGAIN) |
| 878 | goto out; |
| 879 | |
| 880 | while ((mpath = rhashtable_walk_next(&iter))) { |
| 881 | if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN) |
| 882 | continue; |
| 883 | if (IS_ERR(mpath)) |
| 884 | break; |
| 885 | if ((!(mpath->flags & MESH_PATH_RESOLVING)) && |
| 886 | (!(mpath->flags & MESH_PATH_FIXED)) && |
| 887 | time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE)) |
| 888 | __mesh_path_del(tbl, mpath); |
| 889 | } |
| 890 | out: |
| 891 | rhashtable_walk_stop(&iter); |
| 892 | rhashtable_walk_exit(&iter); |
| 893 | } |
| 894 | |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 895 | void mesh_path_expire(struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 896 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 897 | mesh_path_tbl_expire(sdata, sdata->u.mesh.mesh_paths); |
| 898 | mesh_path_tbl_expire(sdata, sdata->u.mesh.mpp_paths); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 899 | } |
| 900 | |
Bob Copeland | 2bdaf38 | 2016-02-28 20:03:56 -0500 | [diff] [blame] | 901 | void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 902 | { |
Bob Copeland | 60854fd | 2016-03-02 10:09:20 -0500 | [diff] [blame] | 903 | mesh_table_free(sdata->u.mesh.mesh_paths); |
| 904 | mesh_table_free(sdata->u.mesh.mpp_paths); |
Luis Carlos Cobo | eb2b931 | 2008-02-23 15:17:14 +0100 | [diff] [blame] | 905 | } |