2 * Copyright (c) 2008, 2009 open80211s Ltd.
3 * Author: Luis Carlos Cobo <luisca@cozybit.com>
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.
10 #include <linux/slab.h>
14 #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG
15 #define mhwmp_dbg(fmt, args...) \
16 printk(KERN_DEBUG "Mesh HWMP (%s): " fmt "\n", sdata->name, ##args)
18 #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0)
21 #define TEST_FRAME_LEN 8192
22 #define MAX_METRIC 0xffffffff
25 /* Number of frames buffered per destination for unresolved destinations */
26 #define MESH_FRAME_QUEUE_LEN 10
27 #define MAX_PREQ_QUEUE_LEN 64
29 /* Destination only */
31 /* Reply and forward */
33 /* Unknown Sequence Number */
35 /* Reason code Present */
36 #define MP_F_RCODE 0x02
38 static void mesh_queue_preq(struct mesh_path
*, u8
);
40 static inline u32
u32_field_get(u8
*preq_elem
, int offset
, bool ae
)
44 return get_unaligned_le32(preq_elem
+ offset
);
47 static inline u32
u16_field_get(u8
*preq_elem
, int offset
, bool ae
)
51 return get_unaligned_le16(preq_elem
+ offset
);
54 /* HWMP IE processing macros */
56 #define AE_F_SET(x) (*x & AE_F)
57 #define PREQ_IE_FLAGS(x) (*(x))
58 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
59 #define PREQ_IE_TTL(x) (*(x + 2))
60 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
61 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
62 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0)
63 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x))
64 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x))
65 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
66 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
67 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x))
70 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
71 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
72 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
73 #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
74 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x))
75 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x))
76 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x))
77 #define PREP_IE_TARGET_ADDR(x) (x + 3)
78 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
80 #define PERR_IE_TTL(x) (*(x))
81 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
82 #define PERR_IE_TARGET_ADDR(x) (x + 3)
83 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
84 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0)
86 #define MSEC_TO_TU(x) (x*1000/1024)
87 #define SN_GT(x, y) ((long) (y) - (long) (x) < 0)
88 #define SN_LT(x, y) ((long) (x) - (long) (y) < 0)
90 #define net_traversal_jiffies(s) \
91 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
92 #define default_lifetime(s) \
93 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
94 #define min_preq_int_jiff(s) \
95 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
96 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
97 #define disc_timeout_jiff(s) \
98 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
100 enum mpath_frame_type
{
107 static const u8 broadcast_addr
[ETH_ALEN
] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
109 static int mesh_path_sel_frame_tx(enum mpath_frame_type action
, u8 flags
,
110 u8
*orig_addr
, __le32 orig_sn
, u8 target_flags
, u8
*target
,
111 __le32 target_sn
, const u8
*da
, u8 hop_count
, u8 ttl
,
112 __le32 lifetime
, __le32 metric
, __le32 preq_id
,
113 struct ieee80211_sub_if_data
*sdata
)
115 struct ieee80211_local
*local
= sdata
->local
;
117 struct ieee80211_mgmt
*mgmt
;
119 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.action
.u
.mesh_action
) +
120 sizeof(mgmt
->u
.action
.u
.mesh_action
);
122 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+
124 2 + 37); /* max HWMP IE */
127 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
128 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
129 memset(mgmt
, 0, hdr_len
);
130 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
131 IEEE80211_STYPE_ACTION
);
133 memcpy(mgmt
->da
, da
, ETH_ALEN
);
134 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
136 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
137 mgmt
->u
.action
.category
= WLAN_CATEGORY_MESH_ACTION
;
138 mgmt
->u
.action
.u
.mesh_action
.action_code
=
139 WLAN_MESH_ACTION_HWMP_PATH_SELECTION
;
143 mhwmp_dbg("sending PREQ to %pM", target
);
145 pos
= skb_put(skb
, 2 + ie_len
);
146 *pos
++ = WLAN_EID_PREQ
;
149 mhwmp_dbg("sending PREP to %pM", target
);
151 pos
= skb_put(skb
, 2 + ie_len
);
152 *pos
++ = WLAN_EID_PREP
;
155 mhwmp_dbg("sending RANN from %pM", orig_addr
);
156 ie_len
= sizeof(struct ieee80211_rann_ie
);
157 pos
= skb_put(skb
, 2 + ie_len
);
158 *pos
++ = WLAN_EID_RANN
;
169 if (action
== MPATH_PREP
) {
170 memcpy(pos
, target
, ETH_ALEN
);
172 memcpy(pos
, &target_sn
, 4);
175 if (action
== MPATH_PREQ
) {
176 memcpy(pos
, &preq_id
, 4);
179 memcpy(pos
, orig_addr
, ETH_ALEN
);
181 memcpy(pos
, &orig_sn
, 4);
184 memcpy(pos
, &lifetime
, 4); /* interval for RANN */
186 memcpy(pos
, &metric
, 4);
188 if (action
== MPATH_PREQ
) {
189 *pos
++ = 1; /* destination count */
190 *pos
++ = target_flags
;
191 memcpy(pos
, target
, ETH_ALEN
);
193 memcpy(pos
, &target_sn
, 4);
195 } else if (action
== MPATH_PREP
) {
196 memcpy(pos
, orig_addr
, ETH_ALEN
);
198 memcpy(pos
, &orig_sn
, 4);
202 ieee80211_tx_skb(sdata
, skb
);
207 /* Headroom is not adjusted. Caller should ensure that skb has sufficient
208 * headroom in case the frame is encrypted. */
209 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data
*sdata
,
212 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
214 skb_set_mac_header(skb
, 0);
215 skb_set_network_header(skb
, 0);
216 skb_set_transport_header(skb
, 0);
218 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
219 skb_set_queue_mapping(skb
, IEEE80211_AC_VO
);
222 info
->control
.vif
= &sdata
->vif
;
223 ieee80211_set_qos_hdr(sdata
, skb
);
227 * mesh_send_path error - Sends a PERR mesh management frame
229 * @target: broken destination
230 * @target_sn: SN of the broken destination
231 * @target_rcode: reason code for this PERR
232 * @ra: node this frame is addressed to
234 * Note: This function may be called with driver locks taken that the driver
235 * also acquires in the TX path. To avoid a deadlock we don't transmit the
236 * frame directly but add it to the pending queue instead.
238 int mesh_path_error_tx(u8 ttl
, u8
*target
, __le32 target_sn
,
239 __le16 target_rcode
, const u8
*ra
,
240 struct ieee80211_sub_if_data
*sdata
)
242 struct ieee80211_local
*local
= sdata
->local
;
244 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
245 struct ieee80211_mgmt
*mgmt
;
247 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.action
.u
.mesh_action
) +
248 sizeof(mgmt
->u
.action
.u
.mesh_action
);
250 if (time_before(jiffies
, ifmsh
->next_perr
))
253 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+
255 2 + 15 /* PERR IE */);
258 skb_reserve(skb
, local
->tx_headroom
+ local
->hw
.extra_tx_headroom
);
259 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
260 memset(mgmt
, 0, hdr_len
);
261 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
262 IEEE80211_STYPE_ACTION
);
264 memcpy(mgmt
->da
, ra
, ETH_ALEN
);
265 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
267 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
268 mgmt
->u
.action
.category
= WLAN_CATEGORY_MESH_ACTION
;
269 mgmt
->u
.action
.u
.mesh_action
.action_code
=
270 WLAN_MESH_ACTION_HWMP_PATH_SELECTION
;
272 pos
= skb_put(skb
, 2 + ie_len
);
273 *pos
++ = WLAN_EID_PERR
;
277 /* number of destinations */
280 * flags bit, bit 1 is unset if we know the sequence number and
281 * bit 2 is set if we have a reason code
289 memcpy(pos
, target
, ETH_ALEN
);
291 memcpy(pos
, &target_sn
, 4);
293 memcpy(pos
, &target_rcode
, 2);
295 /* see note in function header */
296 prepare_frame_for_deferred_tx(sdata
, skb
);
297 ifmsh
->next_perr
= TU_TO_EXP_TIME(
298 ifmsh
->mshcfg
.dot11MeshHWMPperrMinInterval
);
299 ieee80211_add_pending_skb(local
, skb
);
303 void ieee80211s_update_metric(struct ieee80211_local
*local
,
304 struct sta_info
*stainfo
, struct sk_buff
*skb
)
306 struct ieee80211_tx_info
*txinfo
= IEEE80211_SKB_CB(skb
);
307 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
310 if (!ieee80211_is_data(hdr
->frame_control
))
313 failed
= !(txinfo
->flags
& IEEE80211_TX_STAT_ACK
);
315 /* moving average, scaled to 100 */
316 stainfo
->fail_avg
= ((80 * stainfo
->fail_avg
+ 5) / 100 + 20 * failed
);
317 if (stainfo
->fail_avg
> 95)
318 mesh_plink_broken(stainfo
);
321 static u32
airtime_link_metric_get(struct ieee80211_local
*local
,
322 struct sta_info
*sta
)
324 struct ieee80211_supported_band
*sband
;
325 /* This should be adjusted for each device */
326 int device_constant
= 1 << ARITH_SHIFT
;
327 int test_frame_len
= TEST_FRAME_LEN
<< ARITH_SHIFT
;
328 int s_unit
= 1 << ARITH_SHIFT
;
330 u32 tx_time
, estimated_retx
;
333 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
335 if (sta
->fail_avg
>= 100)
338 if (sta
->last_tx_rate
.flags
& IEEE80211_TX_RC_MCS
)
341 err
= (sta
->fail_avg
<< ARITH_SHIFT
) / 100;
343 /* bitrate is in units of 100 Kbps, while we need rate in units of
344 * 1Mbps. This will be corrected on tx_time computation.
346 rate
= sband
->bitrates
[sta
->last_tx_rate
.idx
].bitrate
;
347 tx_time
= (device_constant
+ 10 * test_frame_len
/ rate
);
348 estimated_retx
= ((1 << (2 * ARITH_SHIFT
)) / (s_unit
- err
));
349 result
= (tx_time
* estimated_retx
) >> (2 * ARITH_SHIFT
) ;
354 * hwmp_route_info_get - Update routing info to originator and transmitter
356 * @sdata: local mesh subif
357 * @mgmt: mesh management frame
358 * @hwmp_ie: hwmp information element (PREP or PREQ)
360 * This function updates the path routing information to the originator and the
361 * transmitter of a HWMP PREQ or PREP frame.
363 * Returns: metric to frame originator or 0 if the frame should not be further
366 * Notes: this function is the only place (besides user-provided info) where
367 * path routing information is updated.
369 static u32
hwmp_route_info_get(struct ieee80211_sub_if_data
*sdata
,
370 struct ieee80211_mgmt
*mgmt
,
371 u8
*hwmp_ie
, enum mpath_frame_type action
)
373 struct ieee80211_local
*local
= sdata
->local
;
374 struct mesh_path
*mpath
;
375 struct sta_info
*sta
;
378 u32 orig_sn
, orig_metric
;
379 unsigned long orig_lifetime
, exp_time
;
380 u32 last_hop_metric
, new_metric
;
384 sta
= sta_info_get(sdata
, mgmt
->sa
);
390 last_hop_metric
= airtime_link_metric_get(local
, sta
);
391 /* Update and check originator routing info */
396 orig_addr
= PREQ_IE_ORIG_ADDR(hwmp_ie
);
397 orig_sn
= PREQ_IE_ORIG_SN(hwmp_ie
);
398 orig_lifetime
= PREQ_IE_LIFETIME(hwmp_ie
);
399 orig_metric
= PREQ_IE_METRIC(hwmp_ie
);
402 /* Originator here refers to the MP that was the target in the
403 * Path Request. We divert from the nomenclature in the draft
404 * so that we can easily use a single function to gather path
405 * information from both PREQ and PREP frames.
407 orig_addr
= PREP_IE_TARGET_ADDR(hwmp_ie
);
408 orig_sn
= PREP_IE_TARGET_SN(hwmp_ie
);
409 orig_lifetime
= PREP_IE_LIFETIME(hwmp_ie
);
410 orig_metric
= PREP_IE_METRIC(hwmp_ie
);
416 new_metric
= orig_metric
+ last_hop_metric
;
417 if (new_metric
< orig_metric
)
418 new_metric
= MAX_METRIC
;
419 exp_time
= TU_TO_EXP_TIME(orig_lifetime
);
421 if (memcmp(orig_addr
, sdata
->vif
.addr
, ETH_ALEN
) == 0) {
422 /* This MP is the originator, we are not interested in this
423 * frame, except for updating transmitter's path info.
428 mpath
= mesh_path_lookup(orig_addr
, sdata
);
430 spin_lock_bh(&mpath
->state_lock
);
431 if (mpath
->flags
& MESH_PATH_FIXED
)
433 else if ((mpath
->flags
& MESH_PATH_ACTIVE
) &&
434 (mpath
->flags
& MESH_PATH_SN_VALID
)) {
435 if (SN_GT(mpath
->sn
, orig_sn
) ||
436 (mpath
->sn
== orig_sn
&&
437 new_metric
>= mpath
->metric
)) {
443 mesh_path_add(orig_addr
, sdata
);
444 mpath
= mesh_path_lookup(orig_addr
, sdata
);
449 spin_lock_bh(&mpath
->state_lock
);
453 mesh_path_assign_nexthop(mpath
, sta
);
454 mpath
->flags
|= MESH_PATH_SN_VALID
;
455 mpath
->metric
= new_metric
;
457 mpath
->exp_time
= time_after(mpath
->exp_time
, exp_time
)
458 ? mpath
->exp_time
: exp_time
;
459 mesh_path_activate(mpath
);
460 spin_unlock_bh(&mpath
->state_lock
);
461 mesh_path_tx_pending(mpath
);
462 /* draft says preq_id should be saved to, but there does
463 * not seem to be any use for it, skipping by now
466 spin_unlock_bh(&mpath
->state_lock
);
469 /* Update and check transmitter routing info */
471 if (memcmp(orig_addr
, ta
, ETH_ALEN
) == 0)
476 mpath
= mesh_path_lookup(ta
, sdata
);
478 spin_lock_bh(&mpath
->state_lock
);
479 if ((mpath
->flags
& MESH_PATH_FIXED
) ||
480 ((mpath
->flags
& MESH_PATH_ACTIVE
) &&
481 (last_hop_metric
> mpath
->metric
)))
484 mesh_path_add(ta
, sdata
);
485 mpath
= mesh_path_lookup(ta
, sdata
);
490 spin_lock_bh(&mpath
->state_lock
);
494 mesh_path_assign_nexthop(mpath
, sta
);
495 mpath
->metric
= last_hop_metric
;
496 mpath
->exp_time
= time_after(mpath
->exp_time
, exp_time
)
497 ? mpath
->exp_time
: exp_time
;
498 mesh_path_activate(mpath
);
499 spin_unlock_bh(&mpath
->state_lock
);
500 mesh_path_tx_pending(mpath
);
502 spin_unlock_bh(&mpath
->state_lock
);
507 return process
? new_metric
: 0;
510 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data
*sdata
,
511 struct ieee80211_mgmt
*mgmt
,
512 u8
*preq_elem
, u32 metric
)
514 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
515 struct mesh_path
*mpath
;
516 u8
*target_addr
, *orig_addr
;
517 u8 target_flags
, ttl
;
518 u32 orig_sn
, target_sn
, lifetime
;
522 /* Update target SN, if present */
523 target_addr
= PREQ_IE_TARGET_ADDR(preq_elem
);
524 orig_addr
= PREQ_IE_ORIG_ADDR(preq_elem
);
525 target_sn
= PREQ_IE_TARGET_SN(preq_elem
);
526 orig_sn
= PREQ_IE_ORIG_SN(preq_elem
);
527 target_flags
= PREQ_IE_TARGET_F(preq_elem
);
529 mhwmp_dbg("received PREQ from %pM", orig_addr
);
531 if (memcmp(target_addr
, sdata
->vif
.addr
, ETH_ALEN
) == 0) {
532 mhwmp_dbg("PREQ is for us");
536 if (time_after(jiffies
, ifmsh
->last_sn_update
+
537 net_traversal_jiffies(sdata
)) ||
538 time_before(jiffies
, ifmsh
->last_sn_update
)) {
539 target_sn
= ++ifmsh
->sn
;
540 ifmsh
->last_sn_update
= jiffies
;
544 mpath
= mesh_path_lookup(target_addr
, sdata
);
546 if ((!(mpath
->flags
& MESH_PATH_SN_VALID
)) ||
547 SN_LT(mpath
->sn
, target_sn
)) {
548 mpath
->sn
= target_sn
;
549 mpath
->flags
|= MESH_PATH_SN_VALID
;
550 } else if ((!(target_flags
& MP_F_DO
)) &&
551 (mpath
->flags
& MESH_PATH_ACTIVE
)) {
553 metric
= mpath
->metric
;
554 target_sn
= mpath
->sn
;
555 if (target_flags
& MP_F_RF
)
556 target_flags
|= MP_F_DO
;
565 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
566 ttl
= ifmsh
->mshcfg
.element_ttl
;
568 mhwmp_dbg("replying to the PREQ");
569 mesh_path_sel_frame_tx(MPATH_PREP
, 0, orig_addr
,
570 cpu_to_le32(orig_sn
), 0, target_addr
,
571 cpu_to_le32(target_sn
), mgmt
->sa
, 0, ttl
,
572 cpu_to_le32(lifetime
), cpu_to_le32(metric
),
575 ifmsh
->mshstats
.dropped_frames_ttl
++;
582 ttl
= PREQ_IE_TTL(preq_elem
);
583 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
585 ifmsh
->mshstats
.dropped_frames_ttl
++;
588 mhwmp_dbg("forwarding the PREQ from %pM", orig_addr
);
590 flags
= PREQ_IE_FLAGS(preq_elem
);
591 preq_id
= PREQ_IE_PREQ_ID(preq_elem
);
592 hopcount
= PREQ_IE_HOPCOUNT(preq_elem
) + 1;
593 mesh_path_sel_frame_tx(MPATH_PREQ
, flags
, orig_addr
,
594 cpu_to_le32(orig_sn
), target_flags
, target_addr
,
595 cpu_to_le32(target_sn
), broadcast_addr
,
596 hopcount
, ttl
, cpu_to_le32(lifetime
),
597 cpu_to_le32(metric
), cpu_to_le32(preq_id
),
599 ifmsh
->mshstats
.fwded_mcast
++;
600 ifmsh
->mshstats
.fwded_frames
++;
605 static inline struct sta_info
*
606 next_hop_deref_protected(struct mesh_path
*mpath
)
608 return rcu_dereference_protected(mpath
->next_hop
,
609 lockdep_is_held(&mpath
->state_lock
));
613 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data
*sdata
,
614 struct ieee80211_mgmt
*mgmt
,
615 u8
*prep_elem
, u32 metric
)
617 struct mesh_path
*mpath
;
618 u8
*target_addr
, *orig_addr
;
619 u8 ttl
, hopcount
, flags
;
620 u8 next_hop
[ETH_ALEN
];
621 u32 target_sn
, orig_sn
, lifetime
;
623 mhwmp_dbg("received PREP from %pM", PREP_IE_ORIG_ADDR(prep_elem
));
625 orig_addr
= PREP_IE_ORIG_ADDR(prep_elem
);
626 if (memcmp(orig_addr
, sdata
->vif
.addr
, ETH_ALEN
) == 0)
627 /* destination, no forwarding required */
630 ttl
= PREP_IE_TTL(prep_elem
);
632 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
637 mpath
= mesh_path_lookup(orig_addr
, sdata
);
639 spin_lock_bh(&mpath
->state_lock
);
642 if (!(mpath
->flags
& MESH_PATH_ACTIVE
)) {
643 spin_unlock_bh(&mpath
->state_lock
);
646 memcpy(next_hop
, next_hop_deref_protected(mpath
)->sta
.addr
, ETH_ALEN
);
647 spin_unlock_bh(&mpath
->state_lock
);
649 flags
= PREP_IE_FLAGS(prep_elem
);
650 lifetime
= PREP_IE_LIFETIME(prep_elem
);
651 hopcount
= PREP_IE_HOPCOUNT(prep_elem
) + 1;
652 target_addr
= PREP_IE_TARGET_ADDR(prep_elem
);
653 target_sn
= PREP_IE_TARGET_SN(prep_elem
);
654 orig_sn
= PREP_IE_ORIG_SN(prep_elem
);
656 mesh_path_sel_frame_tx(MPATH_PREP
, flags
, orig_addr
,
657 cpu_to_le32(orig_sn
), 0, target_addr
,
658 cpu_to_le32(target_sn
), next_hop
, hopcount
,
659 ttl
, cpu_to_le32(lifetime
), cpu_to_le32(metric
),
663 sdata
->u
.mesh
.mshstats
.fwded_unicast
++;
664 sdata
->u
.mesh
.mshstats
.fwded_frames
++;
669 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
672 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data
*sdata
,
673 struct ieee80211_mgmt
*mgmt
, u8
*perr_elem
)
675 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
676 struct mesh_path
*mpath
;
678 u8
*ta
, *target_addr
;
683 ttl
= PERR_IE_TTL(perr_elem
);
685 ifmsh
->mshstats
.dropped_frames_ttl
++;
689 target_addr
= PERR_IE_TARGET_ADDR(perr_elem
);
690 target_sn
= PERR_IE_TARGET_SN(perr_elem
);
691 target_rcode
= PERR_IE_TARGET_RCODE(perr_elem
);
694 mpath
= mesh_path_lookup(target_addr
, sdata
);
696 spin_lock_bh(&mpath
->state_lock
);
697 if (mpath
->flags
& MESH_PATH_ACTIVE
&&
698 memcmp(ta
, next_hop_deref_protected(mpath
)->sta
.addr
,
700 (!(mpath
->flags
& MESH_PATH_SN_VALID
) ||
701 SN_GT(target_sn
, mpath
->sn
))) {
702 mpath
->flags
&= ~MESH_PATH_ACTIVE
;
703 mpath
->sn
= target_sn
;
704 spin_unlock_bh(&mpath
->state_lock
);
705 mesh_path_error_tx(ttl
, target_addr
, cpu_to_le32(target_sn
),
706 cpu_to_le16(target_rcode
),
707 broadcast_addr
, sdata
);
709 spin_unlock_bh(&mpath
->state_lock
);
714 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data
*sdata
,
715 struct ieee80211_mgmt
*mgmt
,
716 struct ieee80211_rann_ie
*rann
)
718 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
719 struct mesh_path
*mpath
;
720 u8 ttl
, flags
, hopcount
;
723 u32 interval
= ifmsh
->mshcfg
.dot11MeshHWMPRannInterval
;
726 ttl
= rann
->rann_ttl
;
728 ifmsh
->mshstats
.dropped_frames_ttl
++;
732 flags
= rann
->rann_flags
;
733 root_is_gate
= !!(flags
& RANN_FLAG_IS_GATE
);
734 orig_addr
= rann
->rann_addr
;
735 orig_sn
= rann
->rann_seq
;
736 hopcount
= rann
->rann_hopcount
;
738 metric
= rann
->rann_metric
;
740 /* Ignore our own RANNs */
741 if (memcmp(orig_addr
, sdata
->vif
.addr
, ETH_ALEN
) == 0)
744 mhwmp_dbg("received RANN from %pM (is_gate=%d)", orig_addr
,
748 mpath
= mesh_path_lookup(orig_addr
, sdata
);
750 mesh_path_add(orig_addr
, sdata
);
751 mpath
= mesh_path_lookup(orig_addr
, sdata
);
754 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
759 if ((!(mpath
->flags
& (MESH_PATH_ACTIVE
| MESH_PATH_RESOLVING
)) ||
760 time_after(jiffies
, mpath
->exp_time
- 1*HZ
)) &&
761 !(mpath
->flags
& MESH_PATH_FIXED
)) {
762 mhwmp_dbg("%s time to refresh root mpath %pM", sdata
->name
,
764 mesh_queue_preq(mpath
, PREQ_Q_F_START
| PREQ_Q_F_REFRESH
);
767 if (mpath
->sn
< orig_sn
) {
768 mesh_path_sel_frame_tx(MPATH_RANN
, flags
, orig_addr
,
769 cpu_to_le32(orig_sn
),
770 0, NULL
, 0, broadcast_addr
,
771 hopcount
, ttl
, cpu_to_le32(interval
),
772 cpu_to_le32(metric
+ mpath
->metric
),
777 mesh_path_add_gate(mpath
);
783 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data
*sdata
,
784 struct ieee80211_mgmt
*mgmt
,
787 struct ieee802_11_elems elems
;
790 struct sta_info
*sta
;
792 /* need action_code */
793 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
797 sta
= sta_info_get(sdata
, mgmt
->sa
);
798 if (!sta
|| sta
->plink_state
!= NL80211_PLINK_ESTAB
) {
804 baselen
= (u8
*) mgmt
->u
.action
.u
.mesh_action
.variable
- (u8
*) mgmt
;
805 ieee802_11_parse_elems(mgmt
->u
.action
.u
.mesh_action
.variable
,
806 len
- baselen
, &elems
);
809 if (elems
.preq_len
!= 37)
810 /* Right now we support just 1 destination and no AE */
812 last_hop_metric
= hwmp_route_info_get(sdata
, mgmt
, elems
.preq
,
815 hwmp_preq_frame_process(sdata
, mgmt
, elems
.preq
,
819 if (elems
.prep_len
!= 31)
820 /* Right now we support no AE */
822 last_hop_metric
= hwmp_route_info_get(sdata
, mgmt
, elems
.prep
,
825 hwmp_prep_frame_process(sdata
, mgmt
, elems
.prep
,
829 if (elems
.perr_len
!= 15)
830 /* Right now we support only one destination per PERR */
832 hwmp_perr_frame_process(sdata
, mgmt
, elems
.perr
);
835 hwmp_rann_frame_process(sdata
, mgmt
, elems
.rann
);
839 * mesh_queue_preq - queue a PREQ to a given destination
841 * @mpath: mesh path to discover
842 * @flags: special attributes of the PREQ to be sent
844 * Locking: the function must be called from within a rcu read lock block.
847 static void mesh_queue_preq(struct mesh_path
*mpath
, u8 flags
)
849 struct ieee80211_sub_if_data
*sdata
= mpath
->sdata
;
850 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
851 struct mesh_preq_queue
*preq_node
;
853 preq_node
= kmalloc(sizeof(struct mesh_preq_queue
), GFP_ATOMIC
);
855 mhwmp_dbg("could not allocate PREQ node");
859 spin_lock_bh(&ifmsh
->mesh_preq_queue_lock
);
860 if (ifmsh
->preq_queue_len
== MAX_PREQ_QUEUE_LEN
) {
861 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
863 if (printk_ratelimit())
864 mhwmp_dbg("PREQ node queue full");
868 spin_lock(&mpath
->state_lock
);
869 if (mpath
->flags
& MESH_PATH_REQ_QUEUED
) {
870 spin_unlock(&mpath
->state_lock
);
871 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
876 memcpy(preq_node
->dst
, mpath
->dst
, ETH_ALEN
);
877 preq_node
->flags
= flags
;
879 mpath
->flags
|= MESH_PATH_REQ_QUEUED
;
880 spin_unlock(&mpath
->state_lock
);
882 list_add_tail(&preq_node
->list
, &ifmsh
->preq_queue
.list
);
883 ++ifmsh
->preq_queue_len
;
884 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
886 if (time_after(jiffies
, ifmsh
->last_preq
+ min_preq_int_jiff(sdata
)))
887 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
889 else if (time_before(jiffies
, ifmsh
->last_preq
)) {
890 /* avoid long wait if did not send preqs for a long time
891 * and jiffies wrapped around
893 ifmsh
->last_preq
= jiffies
- min_preq_int_jiff(sdata
) - 1;
894 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
896 mod_timer(&ifmsh
->mesh_path_timer
, ifmsh
->last_preq
+
897 min_preq_int_jiff(sdata
));
901 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
903 * @sdata: local mesh subif
905 void mesh_path_start_discovery(struct ieee80211_sub_if_data
*sdata
)
907 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
908 struct mesh_preq_queue
*preq_node
;
909 struct mesh_path
*mpath
;
910 u8 ttl
, target_flags
;
913 spin_lock_bh(&ifmsh
->mesh_preq_queue_lock
);
914 if (!ifmsh
->preq_queue_len
||
915 time_before(jiffies
, ifmsh
->last_preq
+
916 min_preq_int_jiff(sdata
))) {
917 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
921 preq_node
= list_first_entry(&ifmsh
->preq_queue
.list
,
922 struct mesh_preq_queue
, list
);
923 list_del(&preq_node
->list
);
924 --ifmsh
->preq_queue_len
;
925 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
928 mpath
= mesh_path_lookup(preq_node
->dst
, sdata
);
932 spin_lock_bh(&mpath
->state_lock
);
933 mpath
->flags
&= ~MESH_PATH_REQ_QUEUED
;
934 if (preq_node
->flags
& PREQ_Q_F_START
) {
935 if (mpath
->flags
& MESH_PATH_RESOLVING
) {
936 spin_unlock_bh(&mpath
->state_lock
);
939 mpath
->flags
&= ~MESH_PATH_RESOLVED
;
940 mpath
->flags
|= MESH_PATH_RESOLVING
;
941 mpath
->discovery_retries
= 0;
942 mpath
->discovery_timeout
= disc_timeout_jiff(sdata
);
944 } else if (!(mpath
->flags
& MESH_PATH_RESOLVING
) ||
945 mpath
->flags
& MESH_PATH_RESOLVED
) {
946 mpath
->flags
&= ~MESH_PATH_RESOLVING
;
947 spin_unlock_bh(&mpath
->state_lock
);
951 ifmsh
->last_preq
= jiffies
;
953 if (time_after(jiffies
, ifmsh
->last_sn_update
+
954 net_traversal_jiffies(sdata
)) ||
955 time_before(jiffies
, ifmsh
->last_sn_update
)) {
957 sdata
->u
.mesh
.last_sn_update
= jiffies
;
959 lifetime
= default_lifetime(sdata
);
960 ttl
= sdata
->u
.mesh
.mshcfg
.element_ttl
;
962 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
963 spin_unlock_bh(&mpath
->state_lock
);
967 if (preq_node
->flags
& PREQ_Q_F_REFRESH
)
968 target_flags
= MP_F_DO
;
970 target_flags
= MP_F_RF
;
972 spin_unlock_bh(&mpath
->state_lock
);
973 mesh_path_sel_frame_tx(MPATH_PREQ
, 0, sdata
->vif
.addr
,
974 cpu_to_le32(ifmsh
->sn
), target_flags
, mpath
->dst
,
975 cpu_to_le32(mpath
->sn
), broadcast_addr
, 0,
976 ttl
, cpu_to_le32(lifetime
), 0,
977 cpu_to_le32(ifmsh
->preq_id
++), sdata
);
978 mod_timer(&mpath
->timer
, jiffies
+ mpath
->discovery_timeout
);
985 /* mesh_nexthop_resolve - lookup next hop for given skb and start path
986 * discovery if no forwarding information is found.
988 * @skb: 802.11 frame to be sent
989 * @sdata: network subif the frame will be sent through
991 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
992 * skb is freeed here if no mpath could be allocated.
994 int mesh_nexthop_resolve(struct sk_buff
*skb
,
995 struct ieee80211_sub_if_data
*sdata
)
997 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
998 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
999 struct mesh_path
*mpath
;
1000 struct sk_buff
*skb_to_free
= NULL
;
1001 u8
*target_addr
= hdr
->addr3
;
1005 err
= mesh_nexthop_lookup(skb
, sdata
);
1009 /* no nexthop found, start resolving */
1010 mpath
= mesh_path_lookup(target_addr
, sdata
);
1012 mesh_path_add(target_addr
, sdata
);
1013 mpath
= mesh_path_lookup(target_addr
, sdata
);
1015 mesh_path_discard_frame(skb
, sdata
);
1021 if (!(mpath
->flags
& MESH_PATH_RESOLVING
))
1022 mesh_queue_preq(mpath
, PREQ_Q_F_START
);
1024 if (skb_queue_len(&mpath
->frame_queue
) >= MESH_FRAME_QUEUE_LEN
)
1025 skb_to_free
= skb_dequeue(&mpath
->frame_queue
);
1027 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1028 ieee80211_set_qos_hdr(sdata
, skb
);
1029 skb_queue_tail(&mpath
->frame_queue
, skb
);
1032 mesh_path_discard_frame(skb_to_free
, sdata
);
1039 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1040 * this function is considered "using" the associated mpath, so preempt a path
1041 * refresh if this mpath expires soon.
1043 * @skb: 802.11 frame to be sent
1044 * @sdata: network subif the frame will be sent through
1046 * Returns: 0 if the next hop was found. Nonzero otherwise.
1048 int mesh_nexthop_lookup(struct sk_buff
*skb
,
1049 struct ieee80211_sub_if_data
*sdata
)
1051 struct mesh_path
*mpath
;
1052 struct sta_info
*next_hop
;
1053 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1054 u8
*target_addr
= hdr
->addr3
;
1058 mpath
= mesh_path_lookup(target_addr
, sdata
);
1060 if (!mpath
|| !(mpath
->flags
& MESH_PATH_ACTIVE
))
1063 if (time_after(jiffies
,
1065 msecs_to_jiffies(sdata
->u
.mesh
.mshcfg
.path_refresh_time
)) &&
1066 !memcmp(sdata
->vif
.addr
, hdr
->addr4
, ETH_ALEN
) &&
1067 !(mpath
->flags
& MESH_PATH_RESOLVING
) &&
1068 !(mpath
->flags
& MESH_PATH_FIXED
))
1069 mesh_queue_preq(mpath
, PREQ_Q_F_START
| PREQ_Q_F_REFRESH
);
1071 next_hop
= rcu_dereference(mpath
->next_hop
);
1073 memcpy(hdr
->addr1
, next_hop
->sta
.addr
, ETH_ALEN
);
1074 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1083 void mesh_path_timer(unsigned long data
)
1085 struct mesh_path
*mpath
= (void *) data
;
1086 struct ieee80211_sub_if_data
*sdata
= mpath
->sdata
;
1089 if (sdata
->local
->quiescing
)
1092 spin_lock_bh(&mpath
->state_lock
);
1093 if (mpath
->flags
& MESH_PATH_RESOLVED
||
1094 (!(mpath
->flags
& MESH_PATH_RESOLVING
))) {
1095 mpath
->flags
&= ~(MESH_PATH_RESOLVING
| MESH_PATH_RESOLVED
);
1096 spin_unlock_bh(&mpath
->state_lock
);
1097 } else if (mpath
->discovery_retries
< max_preq_retries(sdata
)) {
1098 ++mpath
->discovery_retries
;
1099 mpath
->discovery_timeout
*= 2;
1100 mpath
->flags
&= ~MESH_PATH_REQ_QUEUED
;
1101 spin_unlock_bh(&mpath
->state_lock
);
1102 mesh_queue_preq(mpath
, 0);
1105 mpath
->exp_time
= jiffies
;
1106 spin_unlock_bh(&mpath
->state_lock
);
1107 if (!mpath
->is_gate
&& mesh_gate_num(sdata
) > 0) {
1108 ret
= mesh_path_send_to_gates(mpath
);
1110 mhwmp_dbg("no gate was reachable");
1112 mesh_path_flush_pending(mpath
);
1117 mesh_path_tx_root_frame(struct ieee80211_sub_if_data
*sdata
)
1119 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
1120 u32 interval
= ifmsh
->mshcfg
.dot11MeshHWMPRannInterval
;
1123 flags
= (ifmsh
->mshcfg
.dot11MeshGateAnnouncementProtocol
)
1124 ? RANN_FLAG_IS_GATE
: 0;
1125 mesh_path_sel_frame_tx(MPATH_RANN
, flags
, sdata
->vif
.addr
,
1126 cpu_to_le32(++ifmsh
->sn
),
1127 0, NULL
, 0, broadcast_addr
,
1128 0, sdata
->u
.mesh
.mshcfg
.element_ttl
,
1129 cpu_to_le32(interval
), 0, 0, sdata
);