Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008 open80211s Ltd. |
| 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 | */ |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 9 | #include <linux/kernel.h> |
| 10 | #include <linux/random.h> |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 11 | #include "ieee80211_i.h" |
| 12 | #include "ieee80211_rate.h" |
| 13 | #include "mesh.h" |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 14 | |
| 15 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 16 | #define mpl_dbg(fmt, args...) printk(KERN_DEBUG fmt, ##args) |
| 17 | #else |
| 18 | #define mpl_dbg(fmt, args...) do { (void)(0); } while (0) |
| 19 | #endif |
| 20 | |
| 21 | #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype) |
| 22 | #define PLINK_GET_FRAME_SUBTYPE(p) (p) |
| 23 | #define PLINK_GET_LLID(p) (p + 1) |
| 24 | #define PLINK_GET_PLID(p) (p + 3) |
| 25 | |
| 26 | #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \ |
| 27 | jiffies + HZ * t / 1000)) |
| 28 | |
| 29 | /* Peer link cancel reasons, all subject to ANA approval */ |
| 30 | #define MESH_LINK_CANCELLED 2 |
| 31 | #define MESH_MAX_NEIGHBORS 3 |
| 32 | #define MESH_CAPABILITY_POLICY_VIOLATION 4 |
| 33 | #define MESH_CLOSE_RCVD 5 |
| 34 | #define MESH_MAX_RETRIES 6 |
| 35 | #define MESH_CONFIRM_TIMEOUT 7 |
| 36 | #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS 8 |
| 37 | #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9 |
| 38 | #define MESH_SECURITY_FAILED_VERIFICATION 10 |
| 39 | |
| 40 | #define dot11MeshMaxRetries(s) (s->u.sta.mshcfg.dot11MeshMaxRetries) |
| 41 | #define dot11MeshRetryTimeout(s) (s->u.sta.mshcfg.dot11MeshRetryTimeout) |
| 42 | #define dot11MeshConfirmTimeout(s) (s->u.sta.mshcfg.dot11MeshConfirmTimeout) |
| 43 | #define dot11MeshHoldingTimeout(s) (s->u.sta.mshcfg.dot11MeshHoldingTimeout) |
| 44 | #define dot11MeshMaxPeerLinks(s) (s->u.sta.mshcfg.dot11MeshMaxPeerLinks) |
| 45 | |
| 46 | enum plink_frame_type { |
| 47 | PLINK_OPEN = 0, |
| 48 | PLINK_CONFIRM, |
| 49 | PLINK_CLOSE |
| 50 | }; |
| 51 | |
| 52 | enum plink_event { |
| 53 | PLINK_UNDEFINED, |
| 54 | OPN_ACPT, |
| 55 | OPN_RJCT, |
| 56 | OPN_IGNR, |
| 57 | CNF_ACPT, |
| 58 | CNF_RJCT, |
| 59 | CNF_IGNR, |
| 60 | CLS_ACPT, |
| 61 | CLS_IGNR |
| 62 | }; |
| 63 | |
| 64 | static inline |
| 65 | void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata) |
| 66 | { |
| 67 | atomic_inc(&sdata->u.sta.mshstats.estab_plinks); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 68 | mesh_accept_plinks_update(sdata); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | static inline |
| 72 | void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata) |
| 73 | { |
| 74 | atomic_dec(&sdata->u.sta.mshstats.estab_plinks); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 75 | mesh_accept_plinks_update(sdata); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | /** |
| 79 | * mesh_plink_fsm_restart - restart a mesh peer link finite state machine |
| 80 | * |
| 81 | * @sta: mes peer link to restart |
| 82 | * |
| 83 | * Locking: this function must be called holding sta->plink_lock |
| 84 | */ |
| 85 | static inline void mesh_plink_fsm_restart(struct sta_info *sta) |
| 86 | { |
| 87 | sta->plink_state = LISTEN; |
Luis Carlos Cobo | 37659ff | 2008-02-29 12:13:38 -0800 | [diff] [blame] | 88 | sta->llid = sta->plid = sta->reason = 0; |
| 89 | sta->plink_retries = 0; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 90 | } |
| 91 | |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 92 | static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata, |
| 93 | u8 *hw_addr, u64 rates) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 94 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 95 | struct ieee80211_local *local = sdata->local; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 96 | struct sta_info *sta; |
| 97 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 98 | if (local->num_sta >= MESH_MAX_PLINKS) |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 99 | return NULL; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 100 | |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 101 | sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 102 | if (!sta) |
| 103 | return NULL; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 104 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 105 | sta->flags |= WLAN_STA_AUTHORIZED; |
| 106 | sta->supp_rates[local->hw.conf.channel->band] = rates; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 107 | |
| 108 | return sta; |
| 109 | } |
| 110 | |
| 111 | /** |
Johannes Berg | 42096b6 | 2008-02-25 21:36:27 +0100 | [diff] [blame] | 112 | * mesh_plink_deactivate - deactivate mesh peer link |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 113 | * |
| 114 | * @sta: mesh peer link to deactivate |
| 115 | * |
| 116 | * All mesh paths with this peer as next hop will be flushed |
| 117 | * |
| 118 | * Locking: the caller must hold sta->plink_lock |
| 119 | */ |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 120 | static void __mesh_plink_deactivate(struct sta_info *sta) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 121 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 122 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 123 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 124 | if (sta->plink_state == ESTAB) |
| 125 | mesh_plink_dec_estab_count(sdata); |
| 126 | sta->plink_state = BLOCKED; |
| 127 | mesh_path_flush_by_nexthop(sta); |
| 128 | } |
| 129 | |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 130 | /** |
| 131 | * __mesh_plink_deactivate - deactivate mesh peer link |
| 132 | * |
| 133 | * @sta: mesh peer link to deactivate |
| 134 | * |
| 135 | * All mesh paths with this peer as next hop will be flushed |
| 136 | */ |
| 137 | void mesh_plink_deactivate(struct sta_info *sta) |
| 138 | { |
| 139 | spin_lock_bh(&sta->plink_lock); |
| 140 | __mesh_plink_deactivate(sta); |
| 141 | spin_unlock_bh(&sta->plink_lock); |
| 142 | } |
| 143 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 144 | static int mesh_plink_frame_tx(struct net_device *dev, |
| 145 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, |
| 146 | __le16 reason) { |
| 147 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| 148 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
| 149 | struct ieee80211_mgmt *mgmt; |
| 150 | bool include_plid = false; |
| 151 | u8 *pos; |
| 152 | int ie_len; |
| 153 | |
| 154 | if (!skb) |
| 155 | return -1; |
| 156 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 157 | /* 25 is the size of the common mgmt part (24) plus the size of the |
| 158 | * common action part (1) |
| 159 | */ |
| 160 | mgmt = (struct ieee80211_mgmt *) |
| 161 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); |
| 162 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); |
| 163 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, |
| 164 | IEEE80211_STYPE_ACTION); |
| 165 | memcpy(mgmt->da, da, ETH_ALEN); |
| 166 | memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN); |
| 167 | /* BSSID is left zeroed, wildcard value */ |
| 168 | mgmt->u.action.category = PLINK_CATEGORY; |
| 169 | mgmt->u.action.u.plink_action.action_code = action; |
| 170 | |
| 171 | if (action == PLINK_CLOSE) |
| 172 | mgmt->u.action.u.plink_action.aux = reason; |
| 173 | else { |
| 174 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); |
| 175 | if (action == PLINK_CONFIRM) { |
| 176 | pos = skb_put(skb, 4); |
| 177 | /* two-byte status code followed by two-byte AID */ |
| 178 | memset(pos, 0, 4); |
| 179 | } |
| 180 | mesh_mgmt_ies_add(skb, dev); |
| 181 | } |
| 182 | |
| 183 | /* Add Peer Link Management element */ |
| 184 | switch (action) { |
| 185 | case PLINK_OPEN: |
| 186 | ie_len = 3; |
| 187 | break; |
| 188 | case PLINK_CONFIRM: |
| 189 | ie_len = 5; |
| 190 | include_plid = true; |
| 191 | break; |
| 192 | case PLINK_CLOSE: |
| 193 | default: |
| 194 | if (!plid) |
| 195 | ie_len = 5; |
| 196 | else { |
| 197 | ie_len = 7; |
| 198 | include_plid = true; |
| 199 | } |
| 200 | break; |
| 201 | } |
| 202 | |
| 203 | pos = skb_put(skb, 2 + ie_len); |
| 204 | *pos++ = WLAN_EID_PEER_LINK; |
| 205 | *pos++ = ie_len; |
| 206 | *pos++ = action; |
| 207 | memcpy(pos, &llid, 2); |
| 208 | if (include_plid) { |
| 209 | pos += 2; |
| 210 | memcpy(pos, &plid, 2); |
| 211 | } |
| 212 | if (action == PLINK_CLOSE) { |
| 213 | pos += 2; |
| 214 | memcpy(pos, &reason, 2); |
| 215 | } |
| 216 | |
| 217 | ieee80211_sta_tx(dev, skb, 0); |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev, |
| 222 | bool peer_accepting_plinks) |
| 223 | { |
| 224 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 225 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| 226 | struct sta_info *sta; |
| 227 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 228 | rcu_read_lock(); |
| 229 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 230 | sta = sta_info_get(local, hw_addr); |
| 231 | if (!sta) { |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 232 | sta = mesh_plink_alloc(sdata, hw_addr, rates); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 233 | if (!sta) { |
| 234 | rcu_read_unlock(); |
| 235 | return; |
| 236 | } |
| 237 | if (sta_info_insert(sta)) { |
| 238 | sta_info_destroy(sta); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 239 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 240 | return; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 241 | } |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | sta->last_rx = jiffies; |
| 245 | sta->supp_rates[local->hw.conf.channel->band] = rates; |
| 246 | if (peer_accepting_plinks && sta->plink_state == LISTEN && |
| 247 | sdata->u.sta.accepting_plinks && |
| 248 | sdata->u.sta.mshcfg.auto_open_plinks) |
| 249 | mesh_plink_open(sta); |
| 250 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 251 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | static void mesh_plink_timer(unsigned long data) |
| 255 | { |
| 256 | struct sta_info *sta; |
| 257 | __le16 llid, plid, reason; |
| 258 | struct net_device *dev = NULL; |
| 259 | struct ieee80211_sub_if_data *sdata; |
| 260 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 261 | DECLARE_MAC_BUF(mac); |
| 262 | #endif |
| 263 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 264 | /* |
| 265 | * This STA is valid because sta_info_destroy() will |
| 266 | * del_timer_sync() this timer after having made sure |
| 267 | * it cannot be readded (by deleting the plink.) |
| 268 | */ |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 269 | sta = (struct sta_info *) data; |
| 270 | |
| 271 | spin_lock_bh(&sta->plink_lock); |
| 272 | if (sta->ignore_plink_timer) { |
| 273 | sta->ignore_plink_timer = false; |
| 274 | spin_unlock_bh(&sta->plink_lock); |
| 275 | return; |
| 276 | } |
| 277 | mpl_dbg("Mesh plink timer for %s fired on state %d\n", |
| 278 | print_mac(mac, sta->addr), sta->plink_state); |
| 279 | reason = 0; |
| 280 | llid = sta->llid; |
| 281 | plid = sta->plid; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 282 | sdata = sta->sdata; |
| 283 | dev = sdata->dev; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 284 | |
| 285 | switch (sta->plink_state) { |
| 286 | case OPN_RCVD: |
| 287 | case OPN_SNT: |
| 288 | /* retry timer */ |
| 289 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { |
| 290 | u32 rand; |
| 291 | mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n", |
| 292 | print_mac(mac, sta->addr), |
| 293 | sta->plink_retries, sta->plink_timeout); |
| 294 | get_random_bytes(&rand, sizeof(u32)); |
| 295 | sta->plink_timeout = sta->plink_timeout + |
| 296 | rand % sta->plink_timeout; |
| 297 | ++sta->plink_retries; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 298 | mod_plink_timer(sta, sta->plink_timeout); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 299 | spin_unlock_bh(&sta->plink_lock); |
| 300 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, |
| 301 | 0, 0); |
| 302 | break; |
| 303 | } |
| 304 | reason = cpu_to_le16(MESH_MAX_RETRIES); |
| 305 | /* fall through on else */ |
| 306 | case CNF_RCVD: |
| 307 | /* confirm timer */ |
| 308 | if (!reason) |
| 309 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); |
| 310 | sta->plink_state = HOLDING; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 311 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 312 | spin_unlock_bh(&sta->plink_lock); |
| 313 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid, |
| 314 | reason); |
| 315 | break; |
| 316 | case HOLDING: |
| 317 | /* holding timer */ |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 318 | del_timer(&sta->plink_timer); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 319 | mesh_plink_fsm_restart(sta); |
| 320 | spin_unlock_bh(&sta->plink_lock); |
| 321 | break; |
| 322 | default: |
| 323 | spin_unlock_bh(&sta->plink_lock); |
| 324 | break; |
| 325 | } |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
| 329 | { |
| 330 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); |
| 331 | sta->plink_timer.data = (unsigned long) sta; |
| 332 | sta->plink_timer.function = mesh_plink_timer; |
| 333 | sta->plink_timeout = timeout; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 334 | add_timer(&sta->plink_timer); |
| 335 | } |
| 336 | |
| 337 | int mesh_plink_open(struct sta_info *sta) |
| 338 | { |
| 339 | __le16 llid; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 340 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 341 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 342 | DECLARE_MAC_BUF(mac); |
| 343 | #endif |
| 344 | |
| 345 | spin_lock_bh(&sta->plink_lock); |
| 346 | get_random_bytes(&llid, 2); |
| 347 | sta->llid = llid; |
| 348 | if (sta->plink_state != LISTEN) { |
| 349 | spin_unlock_bh(&sta->plink_lock); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 350 | return -EBUSY; |
| 351 | } |
| 352 | sta->plink_state = OPN_SNT; |
| 353 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
| 354 | spin_unlock_bh(&sta->plink_lock); |
| 355 | mpl_dbg("Mesh plink: starting establishment with %s\n", |
| 356 | print_mac(mac, sta->addr)); |
| 357 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 358 | return mesh_plink_frame_tx(sdata->dev, PLINK_OPEN, |
| 359 | sta->addr, llid, 0, 0); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 360 | } |
| 361 | |
| 362 | void mesh_plink_block(struct sta_info *sta) |
| 363 | { |
| 364 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 365 | DECLARE_MAC_BUF(mac); |
| 366 | #endif |
| 367 | |
| 368 | spin_lock_bh(&sta->plink_lock); |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 369 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 370 | sta->plink_state = BLOCKED; |
| 371 | spin_unlock_bh(&sta->plink_lock); |
| 372 | } |
| 373 | |
| 374 | int mesh_plink_close(struct sta_info *sta) |
| 375 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 376 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
Luis Carlos Cobo | 37659ff | 2008-02-29 12:13:38 -0800 | [diff] [blame] | 377 | __le16 llid, plid, reason; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 378 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 379 | DECLARE_MAC_BUF(mac); |
| 380 | #endif |
| 381 | |
| 382 | mpl_dbg("Mesh plink: closing link with %s\n", |
| 383 | print_mac(mac, sta->addr)); |
| 384 | spin_lock_bh(&sta->plink_lock); |
| 385 | sta->reason = cpu_to_le16(MESH_LINK_CANCELLED); |
| 386 | reason = sta->reason; |
| 387 | |
| 388 | if (sta->plink_state == LISTEN || sta->plink_state == BLOCKED) { |
| 389 | mesh_plink_fsm_restart(sta); |
| 390 | spin_unlock_bh(&sta->plink_lock); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 391 | return 0; |
| 392 | } else if (sta->plink_state == ESTAB) { |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 393 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 394 | /* The timer should not be running */ |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 395 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 396 | } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) |
| 397 | sta->ignore_plink_timer = true; |
| 398 | |
| 399 | sta->plink_state = HOLDING; |
| 400 | llid = sta->llid; |
| 401 | plid = sta->plid; |
| 402 | spin_unlock_bh(&sta->plink_lock); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 403 | mesh_plink_frame_tx(sta->sdata->dev, PLINK_CLOSE, sta->addr, llid, |
| 404 | plid, reason); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 405 | return 0; |
| 406 | } |
| 407 | |
| 408 | void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt, |
| 409 | size_t len, struct ieee80211_rx_status *rx_status) |
| 410 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 411 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 412 | struct ieee80211_local *local = sdata->local; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 413 | struct ieee802_11_elems elems; |
| 414 | struct sta_info *sta; |
| 415 | enum plink_event event; |
| 416 | enum plink_frame_type ftype; |
| 417 | size_t baselen; |
| 418 | u8 ie_len; |
| 419 | u8 *baseaddr; |
| 420 | __le16 plid, llid, reason; |
| 421 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 422 | DECLARE_MAC_BUF(mac); |
| 423 | #endif |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 424 | |
| 425 | if (is_multicast_ether_addr(mgmt->da)) { |
| 426 | mpl_dbg("Mesh plink: ignore frame from multicast address"); |
| 427 | return; |
| 428 | } |
| 429 | |
| 430 | baseaddr = mgmt->u.action.u.plink_action.variable; |
| 431 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; |
| 432 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { |
| 433 | baseaddr += 4; |
| 434 | baselen -= 4; |
| 435 | } |
| 436 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); |
| 437 | if (!elems.peer_link) { |
| 438 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); |
| 439 | return; |
| 440 | } |
| 441 | |
| 442 | ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link)); |
| 443 | ie_len = elems.peer_link_len; |
| 444 | if ((ftype == PLINK_OPEN && ie_len != 3) || |
| 445 | (ftype == PLINK_CONFIRM && ie_len != 5) || |
| 446 | (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) { |
| 447 | mpl_dbg("Mesh plink: incorrect plink ie length\n"); |
| 448 | return; |
| 449 | } |
| 450 | |
| 451 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { |
| 452 | mpl_dbg("Mesh plink: missing necessary ie\n"); |
| 453 | return; |
| 454 | } |
| 455 | /* Note the lines below are correct, the llid in the frame is the plid |
| 456 | * from the point of view of this host. |
| 457 | */ |
| 458 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); |
| 459 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7)) |
| 460 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); |
| 461 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 462 | rcu_read_lock(); |
| 463 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 464 | sta = sta_info_get(local, mgmt->sa); |
| 465 | if (!sta && ftype != PLINK_OPEN) { |
| 466 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 467 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 468 | return; |
| 469 | } |
| 470 | |
| 471 | if (sta && sta->plink_state == BLOCKED) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 472 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 473 | return; |
| 474 | } |
| 475 | |
| 476 | /* Now we will figure out the appropriate event... */ |
| 477 | event = PLINK_UNDEFINED; |
| 478 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) { |
| 479 | switch (ftype) { |
| 480 | case PLINK_OPEN: |
| 481 | event = OPN_RJCT; |
| 482 | break; |
| 483 | case PLINK_CONFIRM: |
| 484 | event = CNF_RJCT; |
| 485 | break; |
| 486 | case PLINK_CLOSE: |
| 487 | /* avoid warning */ |
| 488 | break; |
| 489 | } |
| 490 | spin_lock_bh(&sta->plink_lock); |
| 491 | } else if (!sta) { |
| 492 | /* ftype == PLINK_OPEN */ |
| 493 | u64 rates; |
| 494 | if (!mesh_plink_free_count(sdata)) { |
| 495 | mpl_dbg("Mesh plink error: no more free plinks\n"); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 496 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 497 | return; |
| 498 | } |
| 499 | |
| 500 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); |
Johannes Berg | 03e4497 | 2008-02-27 09:56:40 +0100 | [diff] [blame] | 501 | sta = mesh_plink_alloc(sdata, mgmt->sa, rates); |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 502 | if (!sta) { |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 503 | mpl_dbg("Mesh plink error: plink table full\n"); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 504 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 505 | return; |
| 506 | } |
Johannes Berg | 73651ee | 2008-02-25 16:27:47 +0100 | [diff] [blame] | 507 | if (sta_info_insert(sta)) { |
| 508 | sta_info_destroy(sta); |
| 509 | rcu_read_unlock(); |
| 510 | return; |
| 511 | } |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 512 | event = OPN_ACPT; |
| 513 | spin_lock_bh(&sta->plink_lock); |
| 514 | } else { |
| 515 | spin_lock_bh(&sta->plink_lock); |
| 516 | switch (ftype) { |
| 517 | case PLINK_OPEN: |
| 518 | if (!mesh_plink_free_count(sdata) || |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 519 | (sta->plid && sta->plid != plid)) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 520 | event = OPN_IGNR; |
| 521 | else |
| 522 | event = OPN_ACPT; |
| 523 | break; |
| 524 | case PLINK_CONFIRM: |
| 525 | if (!mesh_plink_free_count(sdata) || |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 526 | (sta->llid != llid || sta->plid != plid)) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 527 | event = CNF_IGNR; |
| 528 | else |
| 529 | event = CNF_ACPT; |
| 530 | break; |
| 531 | case PLINK_CLOSE: |
| 532 | if (sta->plink_state == ESTAB) |
| 533 | /* Do not check for llid or plid. This does not |
| 534 | * follow the standard but since multiple plinks |
| 535 | * per sta are not supported, it is necessary in |
| 536 | * order to avoid a livelock when MP A sees an |
| 537 | * establish peer link to MP B but MP B does not |
| 538 | * see it. This can be caused by a timeout in |
| 539 | * B's peer link establishment or B beign |
| 540 | * restarted. |
| 541 | */ |
| 542 | event = CLS_ACPT; |
| 543 | else if (sta->plid != plid) |
| 544 | event = CLS_IGNR; |
| 545 | else if (ie_len == 7 && sta->llid != llid) |
| 546 | event = CLS_IGNR; |
| 547 | else |
| 548 | event = CLS_ACPT; |
| 549 | break; |
| 550 | default: |
| 551 | mpl_dbg("Mesh plink: unknown frame subtype\n"); |
| 552 | spin_unlock_bh(&sta->plink_lock); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 553 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 554 | return; |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n", |
| 559 | print_mac(mac, mgmt->sa), sta->plink_state, |
Luis Carlos Cobo | aa2b592 | 2008-02-29 14:30:32 -0800 | [diff] [blame^] | 560 | le16_to_cpu(sta->llid), le16_to_cpu(sta->plid), |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 561 | event); |
| 562 | reason = 0; |
| 563 | switch (sta->plink_state) { |
| 564 | /* spin_unlock as soon as state is updated at each case */ |
| 565 | case LISTEN: |
| 566 | switch (event) { |
| 567 | case CLS_ACPT: |
| 568 | mesh_plink_fsm_restart(sta); |
| 569 | spin_unlock_bh(&sta->plink_lock); |
| 570 | break; |
| 571 | case OPN_ACPT: |
| 572 | sta->plink_state = OPN_RCVD; |
| 573 | sta->plid = plid; |
| 574 | get_random_bytes(&llid, 2); |
| 575 | sta->llid = llid; |
| 576 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
| 577 | spin_unlock_bh(&sta->plink_lock); |
| 578 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, |
| 579 | 0, 0); |
| 580 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, |
| 581 | llid, plid, 0); |
| 582 | break; |
| 583 | default: |
| 584 | spin_unlock_bh(&sta->plink_lock); |
| 585 | break; |
| 586 | } |
| 587 | break; |
| 588 | |
| 589 | case OPN_SNT: |
| 590 | switch (event) { |
| 591 | case OPN_RJCT: |
| 592 | case CNF_RJCT: |
| 593 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 594 | case CLS_ACPT: |
| 595 | if (!reason) |
| 596 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 597 | sta->reason = reason; |
| 598 | sta->plink_state = HOLDING; |
| 599 | if (!mod_plink_timer(sta, |
| 600 | dot11MeshHoldingTimeout(sdata))) |
| 601 | sta->ignore_plink_timer = true; |
| 602 | |
| 603 | llid = sta->llid; |
| 604 | spin_unlock_bh(&sta->plink_lock); |
| 605 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 606 | plid, reason); |
| 607 | break; |
| 608 | case OPN_ACPT: |
| 609 | /* retry timer is left untouched */ |
| 610 | sta->plink_state = OPN_RCVD; |
| 611 | sta->plid = plid; |
| 612 | llid = sta->llid; |
| 613 | spin_unlock_bh(&sta->plink_lock); |
| 614 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 615 | plid, 0); |
| 616 | break; |
| 617 | case CNF_ACPT: |
| 618 | sta->plink_state = CNF_RCVD; |
| 619 | if (!mod_plink_timer(sta, |
| 620 | dot11MeshConfirmTimeout(sdata))) |
| 621 | sta->ignore_plink_timer = true; |
| 622 | |
| 623 | spin_unlock_bh(&sta->plink_lock); |
| 624 | break; |
| 625 | default: |
| 626 | spin_unlock_bh(&sta->plink_lock); |
| 627 | break; |
| 628 | } |
| 629 | break; |
| 630 | |
| 631 | case OPN_RCVD: |
| 632 | switch (event) { |
| 633 | case OPN_RJCT: |
| 634 | case CNF_RJCT: |
| 635 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 636 | case CLS_ACPT: |
| 637 | if (!reason) |
| 638 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 639 | sta->reason = reason; |
| 640 | sta->plink_state = HOLDING; |
| 641 | if (!mod_plink_timer(sta, |
| 642 | dot11MeshHoldingTimeout(sdata))) |
| 643 | sta->ignore_plink_timer = true; |
| 644 | |
| 645 | llid = sta->llid; |
| 646 | spin_unlock_bh(&sta->plink_lock); |
| 647 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 648 | plid, reason); |
| 649 | break; |
| 650 | case OPN_ACPT: |
| 651 | llid = sta->llid; |
| 652 | spin_unlock_bh(&sta->plink_lock); |
| 653 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 654 | plid, 0); |
| 655 | break; |
| 656 | case CNF_ACPT: |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 657 | del_timer(&sta->plink_timer); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 658 | sta->plink_state = ESTAB; |
| 659 | mesh_plink_inc_estab_count(sdata); |
| 660 | spin_unlock_bh(&sta->plink_lock); |
| 661 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", |
| 662 | print_mac(mac, sta->addr)); |
| 663 | break; |
| 664 | default: |
| 665 | spin_unlock_bh(&sta->plink_lock); |
| 666 | break; |
| 667 | } |
| 668 | break; |
| 669 | |
| 670 | case CNF_RCVD: |
| 671 | switch (event) { |
| 672 | case OPN_RJCT: |
| 673 | case CNF_RJCT: |
| 674 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 675 | case CLS_ACPT: |
| 676 | if (!reason) |
| 677 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 678 | sta->reason = reason; |
| 679 | sta->plink_state = HOLDING; |
| 680 | if (!mod_plink_timer(sta, |
| 681 | dot11MeshHoldingTimeout(sdata))) |
| 682 | sta->ignore_plink_timer = true; |
| 683 | |
| 684 | llid = sta->llid; |
| 685 | spin_unlock_bh(&sta->plink_lock); |
| 686 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 687 | plid, reason); |
Johannes Berg | ff59dc7 | 2008-02-25 10:11:50 +0100 | [diff] [blame] | 688 | break; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 689 | case OPN_ACPT: |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 690 | del_timer(&sta->plink_timer); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 691 | sta->plink_state = ESTAB; |
| 692 | mesh_plink_inc_estab_count(sdata); |
| 693 | spin_unlock_bh(&sta->plink_lock); |
| 694 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", |
| 695 | print_mac(mac, sta->addr)); |
| 696 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 697 | plid, 0); |
| 698 | break; |
| 699 | default: |
| 700 | spin_unlock_bh(&sta->plink_lock); |
| 701 | break; |
| 702 | } |
| 703 | break; |
| 704 | |
| 705 | case ESTAB: |
| 706 | switch (event) { |
| 707 | case CLS_ACPT: |
| 708 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 709 | sta->reason = reason; |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 710 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 711 | sta->plink_state = HOLDING; |
| 712 | llid = sta->llid; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 713 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 714 | spin_unlock_bh(&sta->plink_lock); |
| 715 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 716 | plid, reason); |
| 717 | break; |
| 718 | case OPN_ACPT: |
| 719 | llid = sta->llid; |
| 720 | spin_unlock_bh(&sta->plink_lock); |
| 721 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 722 | plid, 0); |
| 723 | break; |
| 724 | default: |
| 725 | spin_unlock_bh(&sta->plink_lock); |
| 726 | break; |
| 727 | } |
| 728 | break; |
| 729 | case HOLDING: |
| 730 | switch (event) { |
| 731 | case CLS_ACPT: |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 732 | if (del_timer(&sta->plink_timer)) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 733 | sta->ignore_plink_timer = 1; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 734 | mesh_plink_fsm_restart(sta); |
| 735 | spin_unlock_bh(&sta->plink_lock); |
| 736 | break; |
| 737 | case OPN_ACPT: |
| 738 | case CNF_ACPT: |
| 739 | case OPN_RJCT: |
| 740 | case CNF_RJCT: |
| 741 | llid = sta->llid; |
| 742 | reason = sta->reason; |
| 743 | spin_unlock_bh(&sta->plink_lock); |
| 744 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 745 | plid, reason); |
| 746 | break; |
| 747 | default: |
| 748 | spin_unlock_bh(&sta->plink_lock); |
| 749 | } |
| 750 | break; |
| 751 | default: |
| 752 | /* should not get here, BLOCKED is dealt with at the beggining |
| 753 | * of the function |
| 754 | */ |
| 755 | spin_unlock_bh(&sta->plink_lock); |
| 756 | break; |
| 757 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 758 | |
| 759 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 760 | } |