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; |
| 88 | sta->llid = sta->plid = sta->reason = sta->plink_retries = 0; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * mesh_plink_add - allocate and add a new mesh peer link |
| 93 | * |
| 94 | * @hw_addr: hardware address (ETH_ALEN length) |
| 95 | * @rates: rates the mesh peer supports |
| 96 | * @dev: local mesh interface |
| 97 | * |
| 98 | * The initial state of the new plink is set to LISTEN |
| 99 | * |
| 100 | * Returns: non-NULL on success, ERR_PTR() on error. |
| 101 | */ |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 102 | struct sta_info *mesh_plink_add(u8 *hw_addr, u64 rates, |
| 103 | struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 104 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 105 | struct ieee80211_local *local = sdata->local; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 106 | struct sta_info *sta; |
| 107 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 108 | if (compare_ether_addr(hw_addr, sdata->dev->dev_addr) == 0) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 109 | /* never add ourselves as neighbours */ |
| 110 | return ERR_PTR(-EINVAL); |
| 111 | |
| 112 | if (is_multicast_ether_addr(hw_addr)) |
| 113 | return ERR_PTR(-EINVAL); |
| 114 | |
| 115 | if (local->num_sta >= MESH_MAX_PLINKS) |
| 116 | return ERR_PTR(-ENOSPC); |
| 117 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 118 | sta = sta_info_add(sdata, hw_addr); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 119 | if (IS_ERR(sta)) |
| 120 | return sta; |
| 121 | |
| 122 | sta->plink_state = LISTEN; |
| 123 | spin_lock_init(&sta->plink_lock); |
| 124 | init_timer(&sta->plink_timer); |
| 125 | sta->flags |= WLAN_STA_AUTHORIZED; |
| 126 | sta->supp_rates[local->hw.conf.channel->band] = rates; |
| 127 | rate_control_rate_init(sta, local); |
| 128 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 129 | mesh_accept_plinks_update(sdata); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 130 | |
| 131 | return sta; |
| 132 | } |
| 133 | |
| 134 | /** |
Johannes Berg | 42096b6 | 2008-02-25 21:36:27 +0100 | [diff] [blame] | 135 | * mesh_plink_deactivate - deactivate mesh peer link |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 136 | * |
| 137 | * @sta: mesh peer link to deactivate |
| 138 | * |
| 139 | * All mesh paths with this peer as next hop will be flushed |
| 140 | * |
| 141 | * Locking: the caller must hold sta->plink_lock |
| 142 | */ |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 143 | static void __mesh_plink_deactivate(struct sta_info *sta) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 144 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 145 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 146 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 147 | if (sta->plink_state == ESTAB) |
| 148 | mesh_plink_dec_estab_count(sdata); |
| 149 | sta->plink_state = BLOCKED; |
| 150 | mesh_path_flush_by_nexthop(sta); |
| 151 | } |
| 152 | |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 153 | /** |
| 154 | * __mesh_plink_deactivate - deactivate mesh peer link |
| 155 | * |
| 156 | * @sta: mesh peer link to deactivate |
| 157 | * |
| 158 | * All mesh paths with this peer as next hop will be flushed |
| 159 | */ |
| 160 | void mesh_plink_deactivate(struct sta_info *sta) |
| 161 | { |
| 162 | spin_lock_bh(&sta->plink_lock); |
| 163 | __mesh_plink_deactivate(sta); |
| 164 | spin_unlock_bh(&sta->plink_lock); |
| 165 | } |
| 166 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 167 | static int mesh_plink_frame_tx(struct net_device *dev, |
| 168 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, |
| 169 | __le16 reason) { |
| 170 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| 171 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
| 172 | struct ieee80211_mgmt *mgmt; |
| 173 | bool include_plid = false; |
| 174 | u8 *pos; |
| 175 | int ie_len; |
| 176 | |
| 177 | if (!skb) |
| 178 | return -1; |
| 179 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 180 | /* 25 is the size of the common mgmt part (24) plus the size of the |
| 181 | * common action part (1) |
| 182 | */ |
| 183 | mgmt = (struct ieee80211_mgmt *) |
| 184 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); |
| 185 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); |
| 186 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, |
| 187 | IEEE80211_STYPE_ACTION); |
| 188 | memcpy(mgmt->da, da, ETH_ALEN); |
| 189 | memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN); |
| 190 | /* BSSID is left zeroed, wildcard value */ |
| 191 | mgmt->u.action.category = PLINK_CATEGORY; |
| 192 | mgmt->u.action.u.plink_action.action_code = action; |
| 193 | |
| 194 | if (action == PLINK_CLOSE) |
| 195 | mgmt->u.action.u.plink_action.aux = reason; |
| 196 | else { |
| 197 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); |
| 198 | if (action == PLINK_CONFIRM) { |
| 199 | pos = skb_put(skb, 4); |
| 200 | /* two-byte status code followed by two-byte AID */ |
| 201 | memset(pos, 0, 4); |
| 202 | } |
| 203 | mesh_mgmt_ies_add(skb, dev); |
| 204 | } |
| 205 | |
| 206 | /* Add Peer Link Management element */ |
| 207 | switch (action) { |
| 208 | case PLINK_OPEN: |
| 209 | ie_len = 3; |
| 210 | break; |
| 211 | case PLINK_CONFIRM: |
| 212 | ie_len = 5; |
| 213 | include_plid = true; |
| 214 | break; |
| 215 | case PLINK_CLOSE: |
| 216 | default: |
| 217 | if (!plid) |
| 218 | ie_len = 5; |
| 219 | else { |
| 220 | ie_len = 7; |
| 221 | include_plid = true; |
| 222 | } |
| 223 | break; |
| 224 | } |
| 225 | |
| 226 | pos = skb_put(skb, 2 + ie_len); |
| 227 | *pos++ = WLAN_EID_PEER_LINK; |
| 228 | *pos++ = ie_len; |
| 229 | *pos++ = action; |
| 230 | memcpy(pos, &llid, 2); |
| 231 | if (include_plid) { |
| 232 | pos += 2; |
| 233 | memcpy(pos, &plid, 2); |
| 234 | } |
| 235 | if (action == PLINK_CLOSE) { |
| 236 | pos += 2; |
| 237 | memcpy(pos, &reason, 2); |
| 238 | } |
| 239 | |
| 240 | ieee80211_sta_tx(dev, skb, 0); |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev, |
| 245 | bool peer_accepting_plinks) |
| 246 | { |
| 247 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 248 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| 249 | struct sta_info *sta; |
| 250 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 251 | rcu_read_lock(); |
| 252 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 253 | sta = sta_info_get(local, hw_addr); |
| 254 | if (!sta) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 255 | sta = mesh_plink_add(hw_addr, rates, sdata); |
| 256 | if (IS_ERR(sta)) { |
| 257 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 258 | return; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 259 | } |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | sta->last_rx = jiffies; |
| 263 | sta->supp_rates[local->hw.conf.channel->band] = rates; |
| 264 | if (peer_accepting_plinks && sta->plink_state == LISTEN && |
| 265 | sdata->u.sta.accepting_plinks && |
| 266 | sdata->u.sta.mshcfg.auto_open_plinks) |
| 267 | mesh_plink_open(sta); |
| 268 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 269 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | static void mesh_plink_timer(unsigned long data) |
| 273 | { |
| 274 | struct sta_info *sta; |
| 275 | __le16 llid, plid, reason; |
| 276 | struct net_device *dev = NULL; |
| 277 | struct ieee80211_sub_if_data *sdata; |
| 278 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 279 | DECLARE_MAC_BUF(mac); |
| 280 | #endif |
| 281 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 282 | /* |
| 283 | * This STA is valid because sta_info_destroy() will |
| 284 | * del_timer_sync() this timer after having made sure |
| 285 | * it cannot be readded (by deleting the plink.) |
| 286 | */ |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 287 | sta = (struct sta_info *) data; |
| 288 | |
| 289 | spin_lock_bh(&sta->plink_lock); |
| 290 | if (sta->ignore_plink_timer) { |
| 291 | sta->ignore_plink_timer = false; |
| 292 | spin_unlock_bh(&sta->plink_lock); |
| 293 | return; |
| 294 | } |
| 295 | mpl_dbg("Mesh plink timer for %s fired on state %d\n", |
| 296 | print_mac(mac, sta->addr), sta->plink_state); |
| 297 | reason = 0; |
| 298 | llid = sta->llid; |
| 299 | plid = sta->plid; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 300 | sdata = sta->sdata; |
| 301 | dev = sdata->dev; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 302 | |
| 303 | switch (sta->plink_state) { |
| 304 | case OPN_RCVD: |
| 305 | case OPN_SNT: |
| 306 | /* retry timer */ |
| 307 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { |
| 308 | u32 rand; |
| 309 | mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n", |
| 310 | print_mac(mac, sta->addr), |
| 311 | sta->plink_retries, sta->plink_timeout); |
| 312 | get_random_bytes(&rand, sizeof(u32)); |
| 313 | sta->plink_timeout = sta->plink_timeout + |
| 314 | rand % sta->plink_timeout; |
| 315 | ++sta->plink_retries; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 316 | mod_plink_timer(sta, sta->plink_timeout); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 317 | spin_unlock_bh(&sta->plink_lock); |
| 318 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, |
| 319 | 0, 0); |
| 320 | break; |
| 321 | } |
| 322 | reason = cpu_to_le16(MESH_MAX_RETRIES); |
| 323 | /* fall through on else */ |
| 324 | case CNF_RCVD: |
| 325 | /* confirm timer */ |
| 326 | if (!reason) |
| 327 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); |
| 328 | sta->plink_state = HOLDING; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 329 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 330 | spin_unlock_bh(&sta->plink_lock); |
| 331 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid, |
| 332 | reason); |
| 333 | break; |
| 334 | case HOLDING: |
| 335 | /* holding timer */ |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 336 | del_timer(&sta->plink_timer); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 337 | mesh_plink_fsm_restart(sta); |
| 338 | spin_unlock_bh(&sta->plink_lock); |
| 339 | break; |
| 340 | default: |
| 341 | spin_unlock_bh(&sta->plink_lock); |
| 342 | break; |
| 343 | } |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
| 347 | { |
| 348 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); |
| 349 | sta->plink_timer.data = (unsigned long) sta; |
| 350 | sta->plink_timer.function = mesh_plink_timer; |
| 351 | sta->plink_timeout = timeout; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 352 | add_timer(&sta->plink_timer); |
| 353 | } |
| 354 | |
| 355 | int mesh_plink_open(struct sta_info *sta) |
| 356 | { |
| 357 | __le16 llid; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 358 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 359 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 360 | DECLARE_MAC_BUF(mac); |
| 361 | #endif |
| 362 | |
| 363 | spin_lock_bh(&sta->plink_lock); |
| 364 | get_random_bytes(&llid, 2); |
| 365 | sta->llid = llid; |
| 366 | if (sta->plink_state != LISTEN) { |
| 367 | spin_unlock_bh(&sta->plink_lock); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 368 | return -EBUSY; |
| 369 | } |
| 370 | sta->plink_state = OPN_SNT; |
| 371 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
| 372 | spin_unlock_bh(&sta->plink_lock); |
| 373 | mpl_dbg("Mesh plink: starting establishment with %s\n", |
| 374 | print_mac(mac, sta->addr)); |
| 375 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 376 | return mesh_plink_frame_tx(sdata->dev, PLINK_OPEN, |
| 377 | sta->addr, llid, 0, 0); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | void mesh_plink_block(struct sta_info *sta) |
| 381 | { |
| 382 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 383 | DECLARE_MAC_BUF(mac); |
| 384 | #endif |
| 385 | |
| 386 | spin_lock_bh(&sta->plink_lock); |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 387 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 388 | sta->plink_state = BLOCKED; |
| 389 | spin_unlock_bh(&sta->plink_lock); |
| 390 | } |
| 391 | |
| 392 | int mesh_plink_close(struct sta_info *sta) |
| 393 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 394 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 395 | int llid, plid, reason; |
| 396 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 397 | DECLARE_MAC_BUF(mac); |
| 398 | #endif |
| 399 | |
| 400 | mpl_dbg("Mesh plink: closing link with %s\n", |
| 401 | print_mac(mac, sta->addr)); |
| 402 | spin_lock_bh(&sta->plink_lock); |
| 403 | sta->reason = cpu_to_le16(MESH_LINK_CANCELLED); |
| 404 | reason = sta->reason; |
| 405 | |
| 406 | if (sta->plink_state == LISTEN || sta->plink_state == BLOCKED) { |
| 407 | mesh_plink_fsm_restart(sta); |
| 408 | spin_unlock_bh(&sta->plink_lock); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 409 | return 0; |
| 410 | } else if (sta->plink_state == ESTAB) { |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 411 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 412 | /* The timer should not be running */ |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 413 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 414 | } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) |
| 415 | sta->ignore_plink_timer = true; |
| 416 | |
| 417 | sta->plink_state = HOLDING; |
| 418 | llid = sta->llid; |
| 419 | plid = sta->plid; |
| 420 | spin_unlock_bh(&sta->plink_lock); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 421 | mesh_plink_frame_tx(sta->sdata->dev, PLINK_CLOSE, sta->addr, llid, |
| 422 | plid, reason); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt, |
| 427 | size_t len, struct ieee80211_rx_status *rx_status) |
| 428 | { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 429 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 430 | struct ieee80211_local *local = sdata->local; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 431 | struct ieee802_11_elems elems; |
| 432 | struct sta_info *sta; |
| 433 | enum plink_event event; |
| 434 | enum plink_frame_type ftype; |
| 435 | size_t baselen; |
| 436 | u8 ie_len; |
| 437 | u8 *baseaddr; |
| 438 | __le16 plid, llid, reason; |
| 439 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 440 | DECLARE_MAC_BUF(mac); |
| 441 | #endif |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 442 | |
| 443 | if (is_multicast_ether_addr(mgmt->da)) { |
| 444 | mpl_dbg("Mesh plink: ignore frame from multicast address"); |
| 445 | return; |
| 446 | } |
| 447 | |
| 448 | baseaddr = mgmt->u.action.u.plink_action.variable; |
| 449 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; |
| 450 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { |
| 451 | baseaddr += 4; |
| 452 | baselen -= 4; |
| 453 | } |
| 454 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); |
| 455 | if (!elems.peer_link) { |
| 456 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); |
| 457 | return; |
| 458 | } |
| 459 | |
| 460 | ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link)); |
| 461 | ie_len = elems.peer_link_len; |
| 462 | if ((ftype == PLINK_OPEN && ie_len != 3) || |
| 463 | (ftype == PLINK_CONFIRM && ie_len != 5) || |
| 464 | (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) { |
| 465 | mpl_dbg("Mesh plink: incorrect plink ie length\n"); |
| 466 | return; |
| 467 | } |
| 468 | |
| 469 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { |
| 470 | mpl_dbg("Mesh plink: missing necessary ie\n"); |
| 471 | return; |
| 472 | } |
| 473 | /* Note the lines below are correct, the llid in the frame is the plid |
| 474 | * from the point of view of this host. |
| 475 | */ |
| 476 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); |
| 477 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7)) |
| 478 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); |
| 479 | |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 480 | rcu_read_lock(); |
| 481 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 482 | sta = sta_info_get(local, mgmt->sa); |
| 483 | if (!sta && ftype != PLINK_OPEN) { |
| 484 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 485 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 486 | return; |
| 487 | } |
| 488 | |
| 489 | if (sta && sta->plink_state == BLOCKED) { |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 490 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 491 | return; |
| 492 | } |
| 493 | |
| 494 | /* Now we will figure out the appropriate event... */ |
| 495 | event = PLINK_UNDEFINED; |
| 496 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) { |
| 497 | switch (ftype) { |
| 498 | case PLINK_OPEN: |
| 499 | event = OPN_RJCT; |
| 500 | break; |
| 501 | case PLINK_CONFIRM: |
| 502 | event = CNF_RJCT; |
| 503 | break; |
| 504 | case PLINK_CLOSE: |
| 505 | /* avoid warning */ |
| 506 | break; |
| 507 | } |
| 508 | spin_lock_bh(&sta->plink_lock); |
| 509 | } else if (!sta) { |
| 510 | /* ftype == PLINK_OPEN */ |
| 511 | u64 rates; |
| 512 | if (!mesh_plink_free_count(sdata)) { |
| 513 | mpl_dbg("Mesh plink error: no more free plinks\n"); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 514 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 515 | return; |
| 516 | } |
| 517 | |
| 518 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 519 | sta = mesh_plink_add(mgmt->sa, rates, sdata); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 520 | if (IS_ERR(sta)) { |
| 521 | mpl_dbg("Mesh plink error: plink table full\n"); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 522 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 523 | return; |
| 524 | } |
| 525 | event = OPN_ACPT; |
| 526 | spin_lock_bh(&sta->plink_lock); |
| 527 | } else { |
| 528 | spin_lock_bh(&sta->plink_lock); |
| 529 | switch (ftype) { |
| 530 | case PLINK_OPEN: |
| 531 | if (!mesh_plink_free_count(sdata) || |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 532 | (sta->plid && sta->plid != plid)) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 533 | event = OPN_IGNR; |
| 534 | else |
| 535 | event = OPN_ACPT; |
| 536 | break; |
| 537 | case PLINK_CONFIRM: |
| 538 | if (!mesh_plink_free_count(sdata) || |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 539 | (sta->llid != llid || sta->plid != plid)) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 540 | event = CNF_IGNR; |
| 541 | else |
| 542 | event = CNF_ACPT; |
| 543 | break; |
| 544 | case PLINK_CLOSE: |
| 545 | if (sta->plink_state == ESTAB) |
| 546 | /* Do not check for llid or plid. This does not |
| 547 | * follow the standard but since multiple plinks |
| 548 | * per sta are not supported, it is necessary in |
| 549 | * order to avoid a livelock when MP A sees an |
| 550 | * establish peer link to MP B but MP B does not |
| 551 | * see it. This can be caused by a timeout in |
| 552 | * B's peer link establishment or B beign |
| 553 | * restarted. |
| 554 | */ |
| 555 | event = CLS_ACPT; |
| 556 | else if (sta->plid != plid) |
| 557 | event = CLS_IGNR; |
| 558 | else if (ie_len == 7 && sta->llid != llid) |
| 559 | event = CLS_IGNR; |
| 560 | else |
| 561 | event = CLS_ACPT; |
| 562 | break; |
| 563 | default: |
| 564 | mpl_dbg("Mesh plink: unknown frame subtype\n"); |
| 565 | spin_unlock_bh(&sta->plink_lock); |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 566 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 567 | return; |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n", |
| 572 | print_mac(mac, mgmt->sa), sta->plink_state, |
| 573 | __le16_to_cpu(sta->llid), __le16_to_cpu(sta->plid), |
| 574 | event); |
| 575 | reason = 0; |
| 576 | switch (sta->plink_state) { |
| 577 | /* spin_unlock as soon as state is updated at each case */ |
| 578 | case LISTEN: |
| 579 | switch (event) { |
| 580 | case CLS_ACPT: |
| 581 | mesh_plink_fsm_restart(sta); |
| 582 | spin_unlock_bh(&sta->plink_lock); |
| 583 | break; |
| 584 | case OPN_ACPT: |
| 585 | sta->plink_state = OPN_RCVD; |
| 586 | sta->plid = plid; |
| 587 | get_random_bytes(&llid, 2); |
| 588 | sta->llid = llid; |
| 589 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
| 590 | spin_unlock_bh(&sta->plink_lock); |
| 591 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, |
| 592 | 0, 0); |
| 593 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, |
| 594 | llid, plid, 0); |
| 595 | break; |
| 596 | default: |
| 597 | spin_unlock_bh(&sta->plink_lock); |
| 598 | break; |
| 599 | } |
| 600 | break; |
| 601 | |
| 602 | case OPN_SNT: |
| 603 | switch (event) { |
| 604 | case OPN_RJCT: |
| 605 | case CNF_RJCT: |
| 606 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 607 | case CLS_ACPT: |
| 608 | if (!reason) |
| 609 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 610 | sta->reason = reason; |
| 611 | sta->plink_state = HOLDING; |
| 612 | if (!mod_plink_timer(sta, |
| 613 | dot11MeshHoldingTimeout(sdata))) |
| 614 | sta->ignore_plink_timer = true; |
| 615 | |
| 616 | llid = sta->llid; |
| 617 | spin_unlock_bh(&sta->plink_lock); |
| 618 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 619 | plid, reason); |
| 620 | break; |
| 621 | case OPN_ACPT: |
| 622 | /* retry timer is left untouched */ |
| 623 | sta->plink_state = OPN_RCVD; |
| 624 | sta->plid = plid; |
| 625 | llid = sta->llid; |
| 626 | spin_unlock_bh(&sta->plink_lock); |
| 627 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 628 | plid, 0); |
| 629 | break; |
| 630 | case CNF_ACPT: |
| 631 | sta->plink_state = CNF_RCVD; |
| 632 | if (!mod_plink_timer(sta, |
| 633 | dot11MeshConfirmTimeout(sdata))) |
| 634 | sta->ignore_plink_timer = true; |
| 635 | |
| 636 | spin_unlock_bh(&sta->plink_lock); |
| 637 | break; |
| 638 | default: |
| 639 | spin_unlock_bh(&sta->plink_lock); |
| 640 | break; |
| 641 | } |
| 642 | break; |
| 643 | |
| 644 | case OPN_RCVD: |
| 645 | switch (event) { |
| 646 | case OPN_RJCT: |
| 647 | case CNF_RJCT: |
| 648 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 649 | case CLS_ACPT: |
| 650 | if (!reason) |
| 651 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 652 | sta->reason = reason; |
| 653 | sta->plink_state = HOLDING; |
| 654 | if (!mod_plink_timer(sta, |
| 655 | dot11MeshHoldingTimeout(sdata))) |
| 656 | sta->ignore_plink_timer = true; |
| 657 | |
| 658 | llid = sta->llid; |
| 659 | spin_unlock_bh(&sta->plink_lock); |
| 660 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 661 | plid, reason); |
| 662 | break; |
| 663 | case OPN_ACPT: |
| 664 | llid = sta->llid; |
| 665 | spin_unlock_bh(&sta->plink_lock); |
| 666 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 667 | plid, 0); |
| 668 | break; |
| 669 | case CNF_ACPT: |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 670 | del_timer(&sta->plink_timer); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 671 | sta->plink_state = ESTAB; |
| 672 | mesh_plink_inc_estab_count(sdata); |
| 673 | spin_unlock_bh(&sta->plink_lock); |
| 674 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", |
| 675 | print_mac(mac, sta->addr)); |
| 676 | break; |
| 677 | default: |
| 678 | spin_unlock_bh(&sta->plink_lock); |
| 679 | break; |
| 680 | } |
| 681 | break; |
| 682 | |
| 683 | case CNF_RCVD: |
| 684 | switch (event) { |
| 685 | case OPN_RJCT: |
| 686 | case CNF_RJCT: |
| 687 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 688 | case CLS_ACPT: |
| 689 | if (!reason) |
| 690 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 691 | sta->reason = reason; |
| 692 | sta->plink_state = HOLDING; |
| 693 | if (!mod_plink_timer(sta, |
| 694 | dot11MeshHoldingTimeout(sdata))) |
| 695 | sta->ignore_plink_timer = true; |
| 696 | |
| 697 | llid = sta->llid; |
| 698 | spin_unlock_bh(&sta->plink_lock); |
| 699 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 700 | plid, reason); |
Johannes Berg | ff59dc7 | 2008-02-25 10:11:50 +0100 | [diff] [blame] | 701 | break; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 702 | case OPN_ACPT: |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 703 | del_timer(&sta->plink_timer); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 704 | sta->plink_state = ESTAB; |
| 705 | mesh_plink_inc_estab_count(sdata); |
| 706 | spin_unlock_bh(&sta->plink_lock); |
| 707 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", |
| 708 | print_mac(mac, sta->addr)); |
| 709 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 710 | plid, 0); |
| 711 | break; |
| 712 | default: |
| 713 | spin_unlock_bh(&sta->plink_lock); |
| 714 | break; |
| 715 | } |
| 716 | break; |
| 717 | |
| 718 | case ESTAB: |
| 719 | switch (event) { |
| 720 | case CLS_ACPT: |
| 721 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 722 | sta->reason = reason; |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 723 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 724 | sta->plink_state = HOLDING; |
| 725 | llid = sta->llid; |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 726 | mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 727 | spin_unlock_bh(&sta->plink_lock); |
| 728 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 729 | plid, reason); |
| 730 | break; |
| 731 | case OPN_ACPT: |
| 732 | llid = sta->llid; |
| 733 | spin_unlock_bh(&sta->plink_lock); |
| 734 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 735 | plid, 0); |
| 736 | break; |
| 737 | default: |
| 738 | spin_unlock_bh(&sta->plink_lock); |
| 739 | break; |
| 740 | } |
| 741 | break; |
| 742 | case HOLDING: |
| 743 | switch (event) { |
| 744 | case CLS_ACPT: |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 745 | if (del_timer(&sta->plink_timer)) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 746 | sta->ignore_plink_timer = 1; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 747 | mesh_plink_fsm_restart(sta); |
| 748 | spin_unlock_bh(&sta->plink_lock); |
| 749 | break; |
| 750 | case OPN_ACPT: |
| 751 | case CNF_ACPT: |
| 752 | case OPN_RJCT: |
| 753 | case CNF_RJCT: |
| 754 | llid = sta->llid; |
| 755 | reason = sta->reason; |
| 756 | spin_unlock_bh(&sta->plink_lock); |
| 757 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 758 | plid, reason); |
| 759 | break; |
| 760 | default: |
| 761 | spin_unlock_bh(&sta->plink_lock); |
| 762 | } |
| 763 | break; |
| 764 | default: |
| 765 | /* should not get here, BLOCKED is dealt with at the beggining |
| 766 | * of the function |
| 767 | */ |
| 768 | spin_unlock_bh(&sta->plink_lock); |
| 769 | break; |
| 770 | } |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame^] | 771 | |
| 772 | rcu_read_unlock(); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 773 | } |