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); |
| 68 | mesh_accept_plinks_update(sdata->dev); |
| 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); |
| 75 | mesh_accept_plinks_update(sdata->dev); |
| 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 | */ |
| 102 | struct sta_info *mesh_plink_add(u8 *hw_addr, u64 rates, struct net_device *dev) |
| 103 | { |
| 104 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| 105 | struct sta_info *sta; |
| 106 | |
| 107 | if (memcmp(hw_addr, dev->dev_addr, ETH_ALEN) == 0) |
| 108 | /* never add ourselves as neighbours */ |
| 109 | return ERR_PTR(-EINVAL); |
| 110 | |
| 111 | if (is_multicast_ether_addr(hw_addr)) |
| 112 | return ERR_PTR(-EINVAL); |
| 113 | |
| 114 | if (local->num_sta >= MESH_MAX_PLINKS) |
| 115 | return ERR_PTR(-ENOSPC); |
| 116 | |
| 117 | sta = sta_info_add(local, dev, hw_addr, GFP_KERNEL); |
| 118 | if (IS_ERR(sta)) |
| 119 | return sta; |
| 120 | |
| 121 | sta->plink_state = LISTEN; |
| 122 | spin_lock_init(&sta->plink_lock); |
| 123 | init_timer(&sta->plink_timer); |
| 124 | sta->flags |= WLAN_STA_AUTHORIZED; |
| 125 | sta->supp_rates[local->hw.conf.channel->band] = rates; |
| 126 | rate_control_rate_init(sta, local); |
| 127 | |
| 128 | mesh_accept_plinks_update(dev); |
| 129 | |
| 130 | return sta; |
| 131 | } |
| 132 | |
| 133 | /** |
Johannes Berg | 42096b6 | 2008-02-25 21:36:27 +0100 | [diff] [blame^] | 134 | * mesh_plink_deactivate - deactivate mesh peer link |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 135 | * |
| 136 | * @sta: mesh peer link to deactivate |
| 137 | * |
| 138 | * All mesh paths with this peer as next hop will be flushed |
| 139 | * |
| 140 | * Locking: the caller must hold sta->plink_lock |
| 141 | */ |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 142 | static void __mesh_plink_deactivate(struct sta_info *sta) |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 143 | { |
| 144 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
| 145 | if (sta->plink_state == ESTAB) |
| 146 | mesh_plink_dec_estab_count(sdata); |
| 147 | sta->plink_state = BLOCKED; |
| 148 | mesh_path_flush_by_nexthop(sta); |
| 149 | } |
| 150 | |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 151 | /** |
| 152 | * __mesh_plink_deactivate - deactivate mesh peer link |
| 153 | * |
| 154 | * @sta: mesh peer link to deactivate |
| 155 | * |
| 156 | * All mesh paths with this peer as next hop will be flushed |
| 157 | */ |
| 158 | void mesh_plink_deactivate(struct sta_info *sta) |
| 159 | { |
| 160 | spin_lock_bh(&sta->plink_lock); |
| 161 | __mesh_plink_deactivate(sta); |
| 162 | spin_unlock_bh(&sta->plink_lock); |
| 163 | } |
| 164 | |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 165 | static int mesh_plink_frame_tx(struct net_device *dev, |
| 166 | enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid, |
| 167 | __le16 reason) { |
| 168 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| 169 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
| 170 | struct ieee80211_mgmt *mgmt; |
| 171 | bool include_plid = false; |
| 172 | u8 *pos; |
| 173 | int ie_len; |
| 174 | |
| 175 | if (!skb) |
| 176 | return -1; |
| 177 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 178 | /* 25 is the size of the common mgmt part (24) plus the size of the |
| 179 | * common action part (1) |
| 180 | */ |
| 181 | mgmt = (struct ieee80211_mgmt *) |
| 182 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action)); |
| 183 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action)); |
| 184 | mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT, |
| 185 | IEEE80211_STYPE_ACTION); |
| 186 | memcpy(mgmt->da, da, ETH_ALEN); |
| 187 | memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN); |
| 188 | /* BSSID is left zeroed, wildcard value */ |
| 189 | mgmt->u.action.category = PLINK_CATEGORY; |
| 190 | mgmt->u.action.u.plink_action.action_code = action; |
| 191 | |
| 192 | if (action == PLINK_CLOSE) |
| 193 | mgmt->u.action.u.plink_action.aux = reason; |
| 194 | else { |
| 195 | mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0); |
| 196 | if (action == PLINK_CONFIRM) { |
| 197 | pos = skb_put(skb, 4); |
| 198 | /* two-byte status code followed by two-byte AID */ |
| 199 | memset(pos, 0, 4); |
| 200 | } |
| 201 | mesh_mgmt_ies_add(skb, dev); |
| 202 | } |
| 203 | |
| 204 | /* Add Peer Link Management element */ |
| 205 | switch (action) { |
| 206 | case PLINK_OPEN: |
| 207 | ie_len = 3; |
| 208 | break; |
| 209 | case PLINK_CONFIRM: |
| 210 | ie_len = 5; |
| 211 | include_plid = true; |
| 212 | break; |
| 213 | case PLINK_CLOSE: |
| 214 | default: |
| 215 | if (!plid) |
| 216 | ie_len = 5; |
| 217 | else { |
| 218 | ie_len = 7; |
| 219 | include_plid = true; |
| 220 | } |
| 221 | break; |
| 222 | } |
| 223 | |
| 224 | pos = skb_put(skb, 2 + ie_len); |
| 225 | *pos++ = WLAN_EID_PEER_LINK; |
| 226 | *pos++ = ie_len; |
| 227 | *pos++ = action; |
| 228 | memcpy(pos, &llid, 2); |
| 229 | if (include_plid) { |
| 230 | pos += 2; |
| 231 | memcpy(pos, &plid, 2); |
| 232 | } |
| 233 | if (action == PLINK_CLOSE) { |
| 234 | pos += 2; |
| 235 | memcpy(pos, &reason, 2); |
| 236 | } |
| 237 | |
| 238 | ieee80211_sta_tx(dev, skb, 0); |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | void mesh_neighbour_update(u8 *hw_addr, u64 rates, struct net_device *dev, |
| 243 | bool peer_accepting_plinks) |
| 244 | { |
| 245 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 246 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| 247 | struct sta_info *sta; |
| 248 | |
| 249 | sta = sta_info_get(local, hw_addr); |
| 250 | if (!sta) { |
| 251 | sta = mesh_plink_add(hw_addr, rates, dev); |
| 252 | if (IS_ERR(sta)) |
| 253 | return; |
| 254 | } |
| 255 | |
| 256 | sta->last_rx = jiffies; |
| 257 | sta->supp_rates[local->hw.conf.channel->band] = rates; |
| 258 | if (peer_accepting_plinks && sta->plink_state == LISTEN && |
| 259 | sdata->u.sta.accepting_plinks && |
| 260 | sdata->u.sta.mshcfg.auto_open_plinks) |
| 261 | mesh_plink_open(sta); |
| 262 | |
| 263 | sta_info_put(sta); |
| 264 | } |
| 265 | |
| 266 | static void mesh_plink_timer(unsigned long data) |
| 267 | { |
| 268 | struct sta_info *sta; |
| 269 | __le16 llid, plid, reason; |
| 270 | struct net_device *dev = NULL; |
| 271 | struct ieee80211_sub_if_data *sdata; |
| 272 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 273 | DECLARE_MAC_BUF(mac); |
| 274 | #endif |
| 275 | |
| 276 | sta = (struct sta_info *) data; |
| 277 | |
| 278 | spin_lock_bh(&sta->plink_lock); |
| 279 | if (sta->ignore_plink_timer) { |
| 280 | sta->ignore_plink_timer = false; |
| 281 | spin_unlock_bh(&sta->plink_lock); |
| 282 | return; |
| 283 | } |
| 284 | mpl_dbg("Mesh plink timer for %s fired on state %d\n", |
| 285 | print_mac(mac, sta->addr), sta->plink_state); |
| 286 | reason = 0; |
| 287 | llid = sta->llid; |
| 288 | plid = sta->plid; |
| 289 | dev = sta->dev; |
| 290 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 291 | |
| 292 | switch (sta->plink_state) { |
| 293 | case OPN_RCVD: |
| 294 | case OPN_SNT: |
| 295 | /* retry timer */ |
| 296 | if (sta->plink_retries < dot11MeshMaxRetries(sdata)) { |
| 297 | u32 rand; |
| 298 | mpl_dbg("Mesh plink for %s (retry, timeout): %d %d\n", |
| 299 | print_mac(mac, sta->addr), |
| 300 | sta->plink_retries, sta->plink_timeout); |
| 301 | get_random_bytes(&rand, sizeof(u32)); |
| 302 | sta->plink_timeout = sta->plink_timeout + |
| 303 | rand % sta->plink_timeout; |
| 304 | ++sta->plink_retries; |
| 305 | if (!mod_plink_timer(sta, sta->plink_timeout)) |
| 306 | __sta_info_get(sta); |
| 307 | spin_unlock_bh(&sta->plink_lock); |
| 308 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, |
| 309 | 0, 0); |
| 310 | break; |
| 311 | } |
| 312 | reason = cpu_to_le16(MESH_MAX_RETRIES); |
| 313 | /* fall through on else */ |
| 314 | case CNF_RCVD: |
| 315 | /* confirm timer */ |
| 316 | if (!reason) |
| 317 | reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT); |
| 318 | sta->plink_state = HOLDING; |
| 319 | if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) |
| 320 | __sta_info_get(sta); |
| 321 | spin_unlock_bh(&sta->plink_lock); |
| 322 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, plid, |
| 323 | reason); |
| 324 | break; |
| 325 | case HOLDING: |
| 326 | /* holding timer */ |
| 327 | if (del_timer(&sta->plink_timer)) |
| 328 | sta_info_put(sta); |
| 329 | mesh_plink_fsm_restart(sta); |
| 330 | spin_unlock_bh(&sta->plink_lock); |
| 331 | break; |
| 332 | default: |
| 333 | spin_unlock_bh(&sta->plink_lock); |
| 334 | break; |
| 335 | } |
| 336 | |
| 337 | sta_info_put(sta); |
| 338 | } |
| 339 | |
| 340 | static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) |
| 341 | { |
| 342 | sta->plink_timer.expires = jiffies + (HZ * timeout / 1000); |
| 343 | sta->plink_timer.data = (unsigned long) sta; |
| 344 | sta->plink_timer.function = mesh_plink_timer; |
| 345 | sta->plink_timeout = timeout; |
| 346 | __sta_info_get(sta); |
| 347 | add_timer(&sta->plink_timer); |
| 348 | } |
| 349 | |
| 350 | int mesh_plink_open(struct sta_info *sta) |
| 351 | { |
| 352 | __le16 llid; |
| 353 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
| 354 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 355 | DECLARE_MAC_BUF(mac); |
| 356 | #endif |
| 357 | |
| 358 | spin_lock_bh(&sta->plink_lock); |
| 359 | get_random_bytes(&llid, 2); |
| 360 | sta->llid = llid; |
| 361 | if (sta->plink_state != LISTEN) { |
| 362 | spin_unlock_bh(&sta->plink_lock); |
| 363 | sta_info_put(sta); |
| 364 | return -EBUSY; |
| 365 | } |
| 366 | sta->plink_state = OPN_SNT; |
| 367 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
| 368 | spin_unlock_bh(&sta->plink_lock); |
| 369 | mpl_dbg("Mesh plink: starting establishment with %s\n", |
| 370 | print_mac(mac, sta->addr)); |
| 371 | |
| 372 | return mesh_plink_frame_tx(sta->dev, PLINK_OPEN, sta->addr, llid, 0, 0); |
| 373 | } |
| 374 | |
| 375 | void mesh_plink_block(struct sta_info *sta) |
| 376 | { |
| 377 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 378 | DECLARE_MAC_BUF(mac); |
| 379 | #endif |
| 380 | |
| 381 | spin_lock_bh(&sta->plink_lock); |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 382 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 383 | sta->plink_state = BLOCKED; |
| 384 | spin_unlock_bh(&sta->plink_lock); |
| 385 | } |
| 386 | |
| 387 | int mesh_plink_close(struct sta_info *sta) |
| 388 | { |
| 389 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
| 390 | int llid, plid, reason; |
| 391 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 392 | DECLARE_MAC_BUF(mac); |
| 393 | #endif |
| 394 | |
| 395 | mpl_dbg("Mesh plink: closing link with %s\n", |
| 396 | print_mac(mac, sta->addr)); |
| 397 | spin_lock_bh(&sta->plink_lock); |
| 398 | sta->reason = cpu_to_le16(MESH_LINK_CANCELLED); |
| 399 | reason = sta->reason; |
| 400 | |
| 401 | if (sta->plink_state == LISTEN || sta->plink_state == BLOCKED) { |
| 402 | mesh_plink_fsm_restart(sta); |
| 403 | spin_unlock_bh(&sta->plink_lock); |
| 404 | sta_info_put(sta); |
| 405 | return 0; |
| 406 | } else if (sta->plink_state == ESTAB) { |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 407 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 408 | /* The timer should not be running */ |
| 409 | if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) |
| 410 | __sta_info_get(sta); |
| 411 | } else if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) |
| 412 | sta->ignore_plink_timer = true; |
| 413 | |
| 414 | sta->plink_state = HOLDING; |
| 415 | llid = sta->llid; |
| 416 | plid = sta->plid; |
| 417 | spin_unlock_bh(&sta->plink_lock); |
| 418 | mesh_plink_frame_tx(sta->dev, PLINK_CLOSE, sta->addr, llid, plid, |
| 419 | reason); |
| 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt, |
| 424 | size_t len, struct ieee80211_rx_status *rx_status) |
| 425 | { |
| 426 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
| 427 | struct ieee802_11_elems elems; |
| 428 | struct sta_info *sta; |
| 429 | enum plink_event event; |
| 430 | enum plink_frame_type ftype; |
| 431 | size_t baselen; |
| 432 | u8 ie_len; |
| 433 | u8 *baseaddr; |
| 434 | __le16 plid, llid, reason; |
| 435 | #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG |
| 436 | DECLARE_MAC_BUF(mac); |
| 437 | #endif |
| 438 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 439 | |
| 440 | if (is_multicast_ether_addr(mgmt->da)) { |
| 441 | mpl_dbg("Mesh plink: ignore frame from multicast address"); |
| 442 | return; |
| 443 | } |
| 444 | |
| 445 | baseaddr = mgmt->u.action.u.plink_action.variable; |
| 446 | baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; |
| 447 | if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { |
| 448 | baseaddr += 4; |
| 449 | baselen -= 4; |
| 450 | } |
| 451 | ieee802_11_parse_elems(baseaddr, len - baselen, &elems); |
| 452 | if (!elems.peer_link) { |
| 453 | mpl_dbg("Mesh plink: missing necessary peer link ie\n"); |
| 454 | return; |
| 455 | } |
| 456 | |
| 457 | ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link)); |
| 458 | ie_len = elems.peer_link_len; |
| 459 | if ((ftype == PLINK_OPEN && ie_len != 3) || |
| 460 | (ftype == PLINK_CONFIRM && ie_len != 5) || |
| 461 | (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) { |
| 462 | mpl_dbg("Mesh plink: incorrect plink ie length\n"); |
| 463 | return; |
| 464 | } |
| 465 | |
| 466 | if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { |
| 467 | mpl_dbg("Mesh plink: missing necessary ie\n"); |
| 468 | return; |
| 469 | } |
| 470 | /* Note the lines below are correct, the llid in the frame is the plid |
| 471 | * from the point of view of this host. |
| 472 | */ |
| 473 | memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2); |
| 474 | if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7)) |
| 475 | memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); |
| 476 | |
| 477 | sta = sta_info_get(local, mgmt->sa); |
| 478 | if (!sta && ftype != PLINK_OPEN) { |
| 479 | mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); |
| 480 | return; |
| 481 | } |
| 482 | |
| 483 | if (sta && sta->plink_state == BLOCKED) { |
| 484 | sta_info_put(sta); |
| 485 | return; |
| 486 | } |
| 487 | |
| 488 | /* Now we will figure out the appropriate event... */ |
| 489 | event = PLINK_UNDEFINED; |
| 490 | if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, dev))) { |
| 491 | switch (ftype) { |
| 492 | case PLINK_OPEN: |
| 493 | event = OPN_RJCT; |
| 494 | break; |
| 495 | case PLINK_CONFIRM: |
| 496 | event = CNF_RJCT; |
| 497 | break; |
| 498 | case PLINK_CLOSE: |
| 499 | /* avoid warning */ |
| 500 | break; |
| 501 | } |
| 502 | spin_lock_bh(&sta->plink_lock); |
| 503 | } else if (!sta) { |
| 504 | /* ftype == PLINK_OPEN */ |
| 505 | u64 rates; |
| 506 | if (!mesh_plink_free_count(sdata)) { |
| 507 | mpl_dbg("Mesh plink error: no more free plinks\n"); |
| 508 | return; |
| 509 | } |
| 510 | |
| 511 | rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); |
| 512 | sta = mesh_plink_add(mgmt->sa, rates, dev); |
| 513 | if (IS_ERR(sta)) { |
| 514 | mpl_dbg("Mesh plink error: plink table full\n"); |
| 515 | return; |
| 516 | } |
| 517 | event = OPN_ACPT; |
| 518 | spin_lock_bh(&sta->plink_lock); |
| 519 | } else { |
| 520 | spin_lock_bh(&sta->plink_lock); |
| 521 | switch (ftype) { |
| 522 | case PLINK_OPEN: |
| 523 | if (!mesh_plink_free_count(sdata) || |
| 524 | (sta->plid && sta->plid != plid)) |
| 525 | event = OPN_IGNR; |
| 526 | else |
| 527 | event = OPN_ACPT; |
| 528 | break; |
| 529 | case PLINK_CONFIRM: |
| 530 | if (!mesh_plink_free_count(sdata) || |
| 531 | (sta->llid != llid || sta->plid != plid)) |
| 532 | event = CNF_IGNR; |
| 533 | else |
| 534 | event = CNF_ACPT; |
| 535 | break; |
| 536 | case PLINK_CLOSE: |
| 537 | if (sta->plink_state == ESTAB) |
| 538 | /* Do not check for llid or plid. This does not |
| 539 | * follow the standard but since multiple plinks |
| 540 | * per sta are not supported, it is necessary in |
| 541 | * order to avoid a livelock when MP A sees an |
| 542 | * establish peer link to MP B but MP B does not |
| 543 | * see it. This can be caused by a timeout in |
| 544 | * B's peer link establishment or B beign |
| 545 | * restarted. |
| 546 | */ |
| 547 | event = CLS_ACPT; |
| 548 | else if (sta->plid != plid) |
| 549 | event = CLS_IGNR; |
| 550 | else if (ie_len == 7 && sta->llid != llid) |
| 551 | event = CLS_IGNR; |
| 552 | else |
| 553 | event = CLS_ACPT; |
| 554 | break; |
| 555 | default: |
| 556 | mpl_dbg("Mesh plink: unknown frame subtype\n"); |
| 557 | spin_unlock_bh(&sta->plink_lock); |
| 558 | sta_info_put(sta); |
| 559 | return; |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | mpl_dbg("Mesh plink (peer, state, llid, plid, event): %s %d %d %d %d\n", |
| 564 | print_mac(mac, mgmt->sa), sta->plink_state, |
| 565 | __le16_to_cpu(sta->llid), __le16_to_cpu(sta->plid), |
| 566 | event); |
| 567 | reason = 0; |
| 568 | switch (sta->plink_state) { |
| 569 | /* spin_unlock as soon as state is updated at each case */ |
| 570 | case LISTEN: |
| 571 | switch (event) { |
| 572 | case CLS_ACPT: |
| 573 | mesh_plink_fsm_restart(sta); |
| 574 | spin_unlock_bh(&sta->plink_lock); |
| 575 | break; |
| 576 | case OPN_ACPT: |
| 577 | sta->plink_state = OPN_RCVD; |
| 578 | sta->plid = plid; |
| 579 | get_random_bytes(&llid, 2); |
| 580 | sta->llid = llid; |
| 581 | mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); |
| 582 | spin_unlock_bh(&sta->plink_lock); |
| 583 | mesh_plink_frame_tx(dev, PLINK_OPEN, sta->addr, llid, |
| 584 | 0, 0); |
| 585 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, |
| 586 | llid, plid, 0); |
| 587 | break; |
| 588 | default: |
| 589 | spin_unlock_bh(&sta->plink_lock); |
| 590 | break; |
| 591 | } |
| 592 | break; |
| 593 | |
| 594 | case OPN_SNT: |
| 595 | switch (event) { |
| 596 | case OPN_RJCT: |
| 597 | case CNF_RJCT: |
| 598 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 599 | case CLS_ACPT: |
| 600 | if (!reason) |
| 601 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 602 | sta->reason = reason; |
| 603 | sta->plink_state = HOLDING; |
| 604 | if (!mod_plink_timer(sta, |
| 605 | dot11MeshHoldingTimeout(sdata))) |
| 606 | sta->ignore_plink_timer = true; |
| 607 | |
| 608 | llid = sta->llid; |
| 609 | spin_unlock_bh(&sta->plink_lock); |
| 610 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 611 | plid, reason); |
| 612 | break; |
| 613 | case OPN_ACPT: |
| 614 | /* retry timer is left untouched */ |
| 615 | sta->plink_state = OPN_RCVD; |
| 616 | sta->plid = plid; |
| 617 | llid = sta->llid; |
| 618 | spin_unlock_bh(&sta->plink_lock); |
| 619 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 620 | plid, 0); |
| 621 | break; |
| 622 | case CNF_ACPT: |
| 623 | sta->plink_state = CNF_RCVD; |
| 624 | if (!mod_plink_timer(sta, |
| 625 | dot11MeshConfirmTimeout(sdata))) |
| 626 | sta->ignore_plink_timer = true; |
| 627 | |
| 628 | spin_unlock_bh(&sta->plink_lock); |
| 629 | break; |
| 630 | default: |
| 631 | spin_unlock_bh(&sta->plink_lock); |
| 632 | break; |
| 633 | } |
| 634 | break; |
| 635 | |
| 636 | case OPN_RCVD: |
| 637 | switch (event) { |
| 638 | case OPN_RJCT: |
| 639 | case CNF_RJCT: |
| 640 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 641 | case CLS_ACPT: |
| 642 | if (!reason) |
| 643 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 644 | sta->reason = reason; |
| 645 | sta->plink_state = HOLDING; |
| 646 | if (!mod_plink_timer(sta, |
| 647 | dot11MeshHoldingTimeout(sdata))) |
| 648 | sta->ignore_plink_timer = true; |
| 649 | |
| 650 | llid = sta->llid; |
| 651 | spin_unlock_bh(&sta->plink_lock); |
| 652 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 653 | plid, reason); |
| 654 | break; |
| 655 | case OPN_ACPT: |
| 656 | llid = sta->llid; |
| 657 | spin_unlock_bh(&sta->plink_lock); |
| 658 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 659 | plid, 0); |
| 660 | break; |
| 661 | case CNF_ACPT: |
| 662 | if (del_timer(&sta->plink_timer)) |
| 663 | sta_info_put(sta); |
| 664 | sta->plink_state = ESTAB; |
| 665 | mesh_plink_inc_estab_count(sdata); |
| 666 | spin_unlock_bh(&sta->plink_lock); |
| 667 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", |
| 668 | print_mac(mac, sta->addr)); |
| 669 | break; |
| 670 | default: |
| 671 | spin_unlock_bh(&sta->plink_lock); |
| 672 | break; |
| 673 | } |
| 674 | break; |
| 675 | |
| 676 | case CNF_RCVD: |
| 677 | switch (event) { |
| 678 | case OPN_RJCT: |
| 679 | case CNF_RJCT: |
| 680 | reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); |
| 681 | case CLS_ACPT: |
| 682 | if (!reason) |
| 683 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 684 | sta->reason = reason; |
| 685 | sta->plink_state = HOLDING; |
| 686 | if (!mod_plink_timer(sta, |
| 687 | dot11MeshHoldingTimeout(sdata))) |
| 688 | sta->ignore_plink_timer = true; |
| 689 | |
| 690 | llid = sta->llid; |
| 691 | spin_unlock_bh(&sta->plink_lock); |
| 692 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 693 | plid, reason); |
Johannes Berg | ff59dc7 | 2008-02-25 10:11:50 +0100 | [diff] [blame] | 694 | break; |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 695 | case OPN_ACPT: |
| 696 | if (del_timer(&sta->plink_timer)) |
| 697 | sta_info_put(sta); |
| 698 | sta->plink_state = ESTAB; |
| 699 | mesh_plink_inc_estab_count(sdata); |
| 700 | spin_unlock_bh(&sta->plink_lock); |
| 701 | mpl_dbg("Mesh plink with %s ESTABLISHED\n", |
| 702 | print_mac(mac, sta->addr)); |
| 703 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 704 | plid, 0); |
| 705 | break; |
| 706 | default: |
| 707 | spin_unlock_bh(&sta->plink_lock); |
| 708 | break; |
| 709 | } |
| 710 | break; |
| 711 | |
| 712 | case ESTAB: |
| 713 | switch (event) { |
| 714 | case CLS_ACPT: |
| 715 | reason = cpu_to_le16(MESH_CLOSE_RCVD); |
| 716 | sta->reason = reason; |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 717 | __mesh_plink_deactivate(sta); |
Luis Carlos Cobo | c3896d2c | 2008-02-23 15:17:13 +0100 | [diff] [blame] | 718 | sta->plink_state = HOLDING; |
| 719 | llid = sta->llid; |
| 720 | if (!mod_plink_timer(sta, |
| 721 | dot11MeshHoldingTimeout(sdata))) |
| 722 | __sta_info_get(sta); |
| 723 | spin_unlock_bh(&sta->plink_lock); |
| 724 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 725 | plid, reason); |
| 726 | break; |
| 727 | case OPN_ACPT: |
| 728 | llid = sta->llid; |
| 729 | spin_unlock_bh(&sta->plink_lock); |
| 730 | mesh_plink_frame_tx(dev, PLINK_CONFIRM, sta->addr, llid, |
| 731 | plid, 0); |
| 732 | break; |
| 733 | default: |
| 734 | spin_unlock_bh(&sta->plink_lock); |
| 735 | break; |
| 736 | } |
| 737 | break; |
| 738 | case HOLDING: |
| 739 | switch (event) { |
| 740 | case CLS_ACPT: |
| 741 | if (del_timer(&sta->plink_timer)) { |
| 742 | sta->ignore_plink_timer = 1; |
| 743 | sta_info_put(sta); |
| 744 | } |
| 745 | mesh_plink_fsm_restart(sta); |
| 746 | spin_unlock_bh(&sta->plink_lock); |
| 747 | break; |
| 748 | case OPN_ACPT: |
| 749 | case CNF_ACPT: |
| 750 | case OPN_RJCT: |
| 751 | case CNF_RJCT: |
| 752 | llid = sta->llid; |
| 753 | reason = sta->reason; |
| 754 | spin_unlock_bh(&sta->plink_lock); |
| 755 | mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid, |
| 756 | plid, reason); |
| 757 | break; |
| 758 | default: |
| 759 | spin_unlock_bh(&sta->plink_lock); |
| 760 | } |
| 761 | break; |
| 762 | default: |
| 763 | /* should not get here, BLOCKED is dealt with at the beggining |
| 764 | * of the function |
| 765 | */ |
| 766 | spin_unlock_bh(&sta->plink_lock); |
| 767 | break; |
| 768 | } |
| 769 | sta_info_put(sta); |
| 770 | } |