2 * Copyright (c) 2008 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.
12 #define TEST_FRAME_LEN 8192
13 #define MAX_METRIC 0xffffffff
16 /* Number of frames buffered per destination for unresolved destinations */
17 #define MESH_FRAME_QUEUE_LEN 10
18 #define MAX_PREQ_QUEUE_LEN 64
20 /* Destination only */
22 /* Reply and forward */
25 static inline u32
u32_field_get(u8
*preq_elem
, int offset
, bool ae
)
29 return get_unaligned_le32(preq_elem
+ offset
);
32 /* HWMP IE processing macros */
34 #define AE_F_SET(x) (*x & AE_F)
35 #define PREQ_IE_FLAGS(x) (*(x))
36 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
37 #define PREQ_IE_TTL(x) (*(x + 2))
38 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
39 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
40 #define PREQ_IE_ORIG_DSN(x) u32_field_get(x, 13, 0);
41 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x));
42 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x));
43 #define PREQ_IE_DST_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
44 #define PREQ_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
45 #define PREQ_IE_DST_DSN(x) u32_field_get(x, 33, AE_F_SET(x));
48 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
49 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
50 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
51 #define PREP_IE_ORIG_ADDR(x) (x + 3)
52 #define PREP_IE_ORIG_DSN(x) u32_field_get(x, 9, 0);
53 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x));
54 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x));
55 #define PREP_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
56 #define PREP_IE_DST_DSN(x) u32_field_get(x, 27, AE_F_SET(x));
58 #define PERR_IE_DST_ADDR(x) (x + 2)
59 #define PERR_IE_DST_DSN(x) u32_field_get(x, 8, 0);
61 #define MSEC_TO_TU(x) (x*1000/1024)
62 #define DSN_GT(x, y) ((long) (y) - (long) (x) < 0)
63 #define DSN_LT(x, y) ((long) (x) - (long) (y) < 0)
65 #define net_traversal_jiffies(s) \
66 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
67 #define default_lifetime(s) \
68 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
69 #define min_preq_int_jiff(s) \
70 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
71 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
72 #define disc_timeout_jiff(s) \
73 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
75 enum mpath_frame_type
{
81 static int mesh_path_sel_frame_tx(enum mpath_frame_type action
, u8 flags
,
82 u8
*orig_addr
, __le32 orig_dsn
, u8 dst_flags
, u8
*dst
,
83 __le32 dst_dsn
, u8
*da
, u8 hop_count
, u8 ttl
, __le32 lifetime
,
84 __le32 metric
, __le32 preq_id
, struct ieee80211_sub_if_data
*sdata
)
86 struct ieee80211_local
*local
= sdata
->local
;
87 struct sk_buff
*skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ 400);
88 struct ieee80211_mgmt
*mgmt
;
94 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
95 /* 25 is the size of the common mgmt part (24) plus the size of the
96 * common action part (1)
98 mgmt
= (struct ieee80211_mgmt
*)
99 skb_put(skb
, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
100 memset(mgmt
, 0, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
101 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
102 IEEE80211_STYPE_ACTION
);
104 memcpy(mgmt
->da
, da
, ETH_ALEN
);
105 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
106 /* BSSID is left zeroed, wildcard value */
107 mgmt
->u
.action
.category
= MESH_PATH_SEL_CATEGORY
;
108 mgmt
->u
.action
.u
.mesh_action
.action_code
= action
;
113 pos
= skb_put(skb
, 2 + ie_len
);
114 *pos
++ = WLAN_EID_PREQ
;
118 pos
= skb_put(skb
, 2 + ie_len
);
119 *pos
++ = WLAN_EID_PREP
;
130 if (action
== MPATH_PREQ
) {
131 memcpy(pos
, &preq_id
, 4);
134 memcpy(pos
, orig_addr
, ETH_ALEN
);
136 memcpy(pos
, &orig_dsn
, 4);
138 memcpy(pos
, &lifetime
, 4);
140 memcpy(pos
, &metric
, 4);
142 if (action
== MPATH_PREQ
) {
143 /* destination count */
147 memcpy(pos
, dst
, ETH_ALEN
);
149 memcpy(pos
, &dst_dsn
, 4);
151 ieee80211_tx_skb(sdata
, skb
, 1);
156 * mesh_send_path error - Sends a PERR mesh management frame
158 * @dst: broken destination
159 * @dst_dsn: dsn of the broken destination
160 * @ra: node this frame is addressed to
162 int mesh_path_error_tx(u8
*dst
, __le32 dst_dsn
, u8
*ra
,
163 struct ieee80211_sub_if_data
*sdata
)
165 struct ieee80211_local
*local
= sdata
->local
;
166 struct sk_buff
*skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ 400);
167 struct ieee80211_mgmt
*mgmt
;
173 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
174 /* 25 is the size of the common mgmt part (24) plus the size of the
175 * common action part (1)
177 mgmt
= (struct ieee80211_mgmt
*)
178 skb_put(skb
, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
179 memset(mgmt
, 0, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
180 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
181 IEEE80211_STYPE_ACTION
);
183 memcpy(mgmt
->da
, ra
, ETH_ALEN
);
184 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
185 /* BSSID is left zeroed, wildcard value */
186 mgmt
->u
.action
.category
= MESH_PATH_SEL_CATEGORY
;
187 mgmt
->u
.action
.u
.mesh_action
.action_code
= MPATH_PERR
;
189 pos
= skb_put(skb
, 2 + ie_len
);
190 *pos
++ = WLAN_EID_PERR
;
192 /* mode flags, reserved */
194 /* number of destinations */
196 memcpy(pos
, dst
, ETH_ALEN
);
198 memcpy(pos
, &dst_dsn
, 4);
200 ieee80211_tx_skb(sdata
, skb
, 1);
204 static u32
airtime_link_metric_get(struct ieee80211_local
*local
,
205 struct sta_info
*sta
)
207 struct ieee80211_supported_band
*sband
;
208 /* This should be adjusted for each device */
209 int device_constant
= 1 << ARITH_SHIFT
;
210 int test_frame_len
= TEST_FRAME_LEN
<< ARITH_SHIFT
;
211 int s_unit
= 1 << ARITH_SHIFT
;
213 u32 tx_time
, estimated_retx
;
216 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
218 if (sta
->fail_avg
>= 100)
221 if (sta
->last_tx_rate
.flags
& IEEE80211_TX_RC_MCS
)
224 err
= (sta
->fail_avg
<< ARITH_SHIFT
) / 100;
226 /* bitrate is in units of 100 Kbps, while we need rate in units of
227 * 1Mbps. This will be corrected on tx_time computation.
229 rate
= sband
->bitrates
[sta
->last_tx_rate
.idx
].bitrate
;
230 tx_time
= (device_constant
+ 10 * test_frame_len
/ rate
);
231 estimated_retx
= ((1 << (2 * ARITH_SHIFT
)) / (s_unit
- err
));
232 result
= (tx_time
* estimated_retx
) >> (2 * ARITH_SHIFT
) ;
237 * hwmp_route_info_get - Update routing info to originator and transmitter
239 * @sdata: local mesh subif
240 * @mgmt: mesh management frame
241 * @hwmp_ie: hwmp information element (PREP or PREQ)
243 * This function updates the path routing information to the originator and the
244 * transmitter of a HWMP PREQ or PREP fram.
246 * Returns: metric to frame originator or 0 if the frame should not be further
249 * Notes: this function is the only place (besides user-provided info) where
250 * path routing information is updated.
252 static u32
hwmp_route_info_get(struct ieee80211_sub_if_data
*sdata
,
253 struct ieee80211_mgmt
*mgmt
,
256 struct ieee80211_local
*local
= sdata
->local
;
257 struct mesh_path
*mpath
;
258 struct sta_info
*sta
;
261 u32 orig_dsn
, orig_metric
;
262 unsigned long orig_lifetime
, exp_time
;
263 u32 last_hop_metric
, new_metric
;
265 u8 action
= mgmt
->u
.action
.u
.mesh_action
.action_code
;
268 sta
= sta_info_get(local
, mgmt
->sa
);
274 last_hop_metric
= airtime_link_metric_get(local
, sta
);
275 /* Update and check originator routing info */
280 orig_addr
= PREQ_IE_ORIG_ADDR(hwmp_ie
);
281 orig_dsn
= PREQ_IE_ORIG_DSN(hwmp_ie
);
282 orig_lifetime
= PREQ_IE_LIFETIME(hwmp_ie
);
283 orig_metric
= PREQ_IE_METRIC(hwmp_ie
);
286 /* Originator here refers to the MP that was the destination in
287 * the Path Request. The draft refers to that MP as the
288 * destination address, even though usually it is the origin of
289 * the PREP frame. We divert from the nomenclature in the draft
290 * so that we can easily use a single function to gather path
291 * information from both PREQ and PREP frames.
293 orig_addr
= PREP_IE_ORIG_ADDR(hwmp_ie
);
294 orig_dsn
= PREP_IE_ORIG_DSN(hwmp_ie
);
295 orig_lifetime
= PREP_IE_LIFETIME(hwmp_ie
);
296 orig_metric
= PREP_IE_METRIC(hwmp_ie
);
302 new_metric
= orig_metric
+ last_hop_metric
;
303 if (new_metric
< orig_metric
)
304 new_metric
= MAX_METRIC
;
305 exp_time
= TU_TO_EXP_TIME(orig_lifetime
);
307 if (memcmp(orig_addr
, sdata
->dev
->dev_addr
, ETH_ALEN
) == 0) {
308 /* This MP is the originator, we are not interested in this
309 * frame, except for updating transmitter's path info.
314 mpath
= mesh_path_lookup(orig_addr
, sdata
);
316 spin_lock_bh(&mpath
->state_lock
);
317 if (mpath
->flags
& MESH_PATH_FIXED
)
319 else if ((mpath
->flags
& MESH_PATH_ACTIVE
) &&
320 (mpath
->flags
& MESH_PATH_DSN_VALID
)) {
321 if (DSN_GT(mpath
->dsn
, orig_dsn
) ||
322 (mpath
->dsn
== orig_dsn
&&
323 action
== MPATH_PREQ
&&
324 new_metric
> mpath
->metric
)) {
330 mesh_path_add(orig_addr
, sdata
);
331 mpath
= mesh_path_lookup(orig_addr
, sdata
);
336 spin_lock_bh(&mpath
->state_lock
);
340 mesh_path_assign_nexthop(mpath
, sta
);
341 mpath
->flags
|= MESH_PATH_DSN_VALID
;
342 mpath
->metric
= new_metric
;
343 mpath
->dsn
= orig_dsn
;
344 mpath
->exp_time
= time_after(mpath
->exp_time
, exp_time
)
345 ? mpath
->exp_time
: exp_time
;
346 mesh_path_activate(mpath
);
347 spin_unlock_bh(&mpath
->state_lock
);
348 mesh_path_tx_pending(mpath
);
349 /* draft says preq_id should be saved to, but there does
350 * not seem to be any use for it, skipping by now
353 spin_unlock_bh(&mpath
->state_lock
);
356 /* Update and check transmitter routing info */
358 if (memcmp(orig_addr
, ta
, ETH_ALEN
) == 0)
363 mpath
= mesh_path_lookup(ta
, sdata
);
365 spin_lock_bh(&mpath
->state_lock
);
366 if ((mpath
->flags
& MESH_PATH_FIXED
) ||
367 ((mpath
->flags
& MESH_PATH_ACTIVE
) &&
368 (last_hop_metric
> mpath
->metric
)))
371 mesh_path_add(ta
, sdata
);
372 mpath
= mesh_path_lookup(ta
, sdata
);
377 spin_lock_bh(&mpath
->state_lock
);
381 mesh_path_assign_nexthop(mpath
, sta
);
382 mpath
->flags
&= ~MESH_PATH_DSN_VALID
;
383 mpath
->metric
= last_hop_metric
;
384 mpath
->exp_time
= time_after(mpath
->exp_time
, exp_time
)
385 ? mpath
->exp_time
: exp_time
;
386 mesh_path_activate(mpath
);
387 spin_unlock_bh(&mpath
->state_lock
);
388 mesh_path_tx_pending(mpath
);
390 spin_unlock_bh(&mpath
->state_lock
);
395 return process
? new_metric
: 0;
398 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data
*sdata
,
399 struct ieee80211_mgmt
*mgmt
,
400 u8
*preq_elem
, u32 metric
) {
401 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
402 struct mesh_path
*mpath
;
403 u8
*dst_addr
, *orig_addr
;
405 u32 orig_dsn
, dst_dsn
, lifetime
;
409 /* Update destination DSN, if present */
410 dst_addr
= PREQ_IE_DST_ADDR(preq_elem
);
411 orig_addr
= PREQ_IE_ORIG_ADDR(preq_elem
);
412 dst_dsn
= PREQ_IE_DST_DSN(preq_elem
);
413 orig_dsn
= PREQ_IE_ORIG_DSN(preq_elem
);
414 dst_flags
= PREQ_IE_DST_F(preq_elem
);
416 if (memcmp(dst_addr
, sdata
->dev
->dev_addr
, ETH_ALEN
) == 0) {
420 if (time_after(jiffies
, ifmsh
->last_dsn_update
+
421 net_traversal_jiffies(sdata
)) ||
422 time_before(jiffies
, ifmsh
->last_dsn_update
)) {
423 dst_dsn
= ++ifmsh
->dsn
;
424 ifmsh
->last_dsn_update
= jiffies
;
428 mpath
= mesh_path_lookup(dst_addr
, sdata
);
430 if ((!(mpath
->flags
& MESH_PATH_DSN_VALID
)) ||
431 DSN_LT(mpath
->dsn
, dst_dsn
)) {
432 mpath
->dsn
= dst_dsn
;
433 mpath
->flags
&= MESH_PATH_DSN_VALID
;
434 } else if ((!(dst_flags
& MP_F_DO
)) &&
435 (mpath
->flags
& MESH_PATH_ACTIVE
)) {
437 metric
= mpath
->metric
;
438 dst_dsn
= mpath
->dsn
;
439 if (dst_flags
& MP_F_RF
)
440 dst_flags
|= MP_F_DO
;
449 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
450 ttl
= ifmsh
->mshcfg
.dot11MeshTTL
;
452 mesh_path_sel_frame_tx(MPATH_PREP
, 0, dst_addr
,
453 cpu_to_le32(dst_dsn
), 0, orig_addr
,
454 cpu_to_le32(orig_dsn
), mgmt
->sa
, 0, ttl
,
455 cpu_to_le32(lifetime
), cpu_to_le32(metric
),
458 ifmsh
->mshstats
.dropped_frames_ttl
++;
465 ttl
= PREQ_IE_TTL(preq_elem
);
466 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
468 ifmsh
->mshstats
.dropped_frames_ttl
++;
472 flags
= PREQ_IE_FLAGS(preq_elem
);
473 preq_id
= PREQ_IE_PREQ_ID(preq_elem
);
474 hopcount
= PREQ_IE_HOPCOUNT(preq_elem
) + 1;
475 mesh_path_sel_frame_tx(MPATH_PREQ
, flags
, orig_addr
,
476 cpu_to_le32(orig_dsn
), dst_flags
, dst_addr
,
477 cpu_to_le32(dst_dsn
), sdata
->dev
->broadcast
,
478 hopcount
, ttl
, cpu_to_le32(lifetime
),
479 cpu_to_le32(metric
), cpu_to_le32(preq_id
),
481 ifmsh
->mshstats
.fwded_frames
++;
486 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data
*sdata
,
487 struct ieee80211_mgmt
*mgmt
,
488 u8
*prep_elem
, u32 metric
)
490 struct mesh_path
*mpath
;
491 u8
*dst_addr
, *orig_addr
;
492 u8 ttl
, hopcount
, flags
;
493 u8 next_hop
[ETH_ALEN
];
494 u32 dst_dsn
, orig_dsn
, lifetime
;
496 /* Note that we divert from the draft nomenclature and denominate
497 * destination to what the draft refers to as origininator. So in this
498 * function destnation refers to the final destination of the PREP,
499 * which corresponds with the originator of the PREQ which this PREP
502 dst_addr
= PREP_IE_DST_ADDR(prep_elem
);
503 if (memcmp(dst_addr
, sdata
->dev
->dev_addr
, ETH_ALEN
) == 0)
504 /* destination, no forwarding required */
507 ttl
= PREP_IE_TTL(prep_elem
);
509 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
514 mpath
= mesh_path_lookup(dst_addr
, sdata
);
516 spin_lock_bh(&mpath
->state_lock
);
519 if (!(mpath
->flags
& MESH_PATH_ACTIVE
)) {
520 spin_unlock_bh(&mpath
->state_lock
);
523 memcpy(next_hop
, mpath
->next_hop
->sta
.addr
, ETH_ALEN
);
524 spin_unlock_bh(&mpath
->state_lock
);
526 flags
= PREP_IE_FLAGS(prep_elem
);
527 lifetime
= PREP_IE_LIFETIME(prep_elem
);
528 hopcount
= PREP_IE_HOPCOUNT(prep_elem
) + 1;
529 orig_addr
= PREP_IE_ORIG_ADDR(prep_elem
);
530 dst_dsn
= PREP_IE_DST_DSN(prep_elem
);
531 orig_dsn
= PREP_IE_ORIG_DSN(prep_elem
);
533 mesh_path_sel_frame_tx(MPATH_PREP
, flags
, orig_addr
,
534 cpu_to_le32(orig_dsn
), 0, dst_addr
,
535 cpu_to_le32(dst_dsn
), mpath
->next_hop
->sta
.addr
, hopcount
, ttl
,
536 cpu_to_le32(lifetime
), cpu_to_le32(metric
),
539 sdata
->u
.mesh
.mshstats
.fwded_frames
++;
544 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
548 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data
*sdata
,
549 struct ieee80211_mgmt
*mgmt
, u8
*perr_elem
)
551 struct mesh_path
*mpath
;
556 dst_addr
= PERR_IE_DST_ADDR(perr_elem
);
557 dst_dsn
= PERR_IE_DST_DSN(perr_elem
);
559 mpath
= mesh_path_lookup(dst_addr
, sdata
);
561 spin_lock_bh(&mpath
->state_lock
);
562 if (mpath
->flags
& MESH_PATH_ACTIVE
&&
563 memcmp(ta
, mpath
->next_hop
->sta
.addr
, ETH_ALEN
) == 0 &&
564 (!(mpath
->flags
& MESH_PATH_DSN_VALID
) ||
565 DSN_GT(dst_dsn
, mpath
->dsn
))) {
566 mpath
->flags
&= ~MESH_PATH_ACTIVE
;
567 mpath
->dsn
= dst_dsn
;
568 spin_unlock_bh(&mpath
->state_lock
);
569 mesh_path_error_tx(dst_addr
, cpu_to_le32(dst_dsn
),
570 sdata
->dev
->broadcast
, sdata
);
572 spin_unlock_bh(&mpath
->state_lock
);
579 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data
*sdata
,
580 struct ieee80211_mgmt
*mgmt
,
583 struct ieee802_11_elems elems
;
587 /* need action_code */
588 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
591 baselen
= (u8
*) mgmt
->u
.action
.u
.mesh_action
.variable
- (u8
*) mgmt
;
592 ieee802_11_parse_elems(mgmt
->u
.action
.u
.mesh_action
.variable
,
593 len
- baselen
, &elems
);
595 switch (mgmt
->u
.action
.u
.mesh_action
.action_code
) {
597 if (!elems
.preq
|| elems
.preq_len
!= 37)
598 /* Right now we support just 1 destination and no AE */
600 last_hop_metric
= hwmp_route_info_get(sdata
, mgmt
, elems
.preq
);
601 if (!last_hop_metric
)
603 hwmp_preq_frame_process(sdata
, mgmt
, elems
.preq
, last_hop_metric
);
606 if (!elems
.prep
|| elems
.prep_len
!= 31)
607 /* Right now we support no AE */
609 last_hop_metric
= hwmp_route_info_get(sdata
, mgmt
, elems
.prep
);
610 if (!last_hop_metric
)
612 hwmp_prep_frame_process(sdata
, mgmt
, elems
.prep
, last_hop_metric
);
615 if (!elems
.perr
|| elems
.perr_len
!= 12)
616 /* Right now we support only one destination per PERR */
618 hwmp_perr_frame_process(sdata
, mgmt
, elems
.perr
);
626 * mesh_queue_preq - queue a PREQ to a given destination
628 * @mpath: mesh path to discover
629 * @flags: special attributes of the PREQ to be sent
631 * Locking: the function must be called from within a rcu read lock block.
634 static void mesh_queue_preq(struct mesh_path
*mpath
, u8 flags
)
636 struct ieee80211_sub_if_data
*sdata
= mpath
->sdata
;
637 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
638 struct mesh_preq_queue
*preq_node
;
640 preq_node
= kmalloc(sizeof(struct mesh_preq_queue
), GFP_KERNEL
);
642 printk(KERN_DEBUG
"Mesh HWMP: could not allocate PREQ node\n");
646 spin_lock(&ifmsh
->mesh_preq_queue_lock
);
647 if (ifmsh
->preq_queue_len
== MAX_PREQ_QUEUE_LEN
) {
648 spin_unlock(&ifmsh
->mesh_preq_queue_lock
);
650 if (printk_ratelimit())
651 printk(KERN_DEBUG
"Mesh HWMP: PREQ node queue full\n");
655 memcpy(preq_node
->dst
, mpath
->dst
, ETH_ALEN
);
656 preq_node
->flags
= flags
;
658 list_add_tail(&preq_node
->list
, &ifmsh
->preq_queue
.list
);
659 ++ifmsh
->preq_queue_len
;
660 spin_unlock(&ifmsh
->mesh_preq_queue_lock
);
662 if (time_after(jiffies
, ifmsh
->last_preq
+ min_preq_int_jiff(sdata
)))
663 queue_work(sdata
->local
->hw
.workqueue
, &ifmsh
->work
);
665 else if (time_before(jiffies
, ifmsh
->last_preq
)) {
666 /* avoid long wait if did not send preqs for a long time
667 * and jiffies wrapped around
669 ifmsh
->last_preq
= jiffies
- min_preq_int_jiff(sdata
) - 1;
670 queue_work(sdata
->local
->hw
.workqueue
, &ifmsh
->work
);
672 mod_timer(&ifmsh
->mesh_path_timer
, ifmsh
->last_preq
+
673 min_preq_int_jiff(sdata
));
677 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
679 * @sdata: local mesh subif
681 void mesh_path_start_discovery(struct ieee80211_sub_if_data
*sdata
)
683 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
684 struct mesh_preq_queue
*preq_node
;
685 struct mesh_path
*mpath
;
689 spin_lock(&ifmsh
->mesh_preq_queue_lock
);
690 if (!ifmsh
->preq_queue_len
||
691 time_before(jiffies
, ifmsh
->last_preq
+
692 min_preq_int_jiff(sdata
))) {
693 spin_unlock(&ifmsh
->mesh_preq_queue_lock
);
697 preq_node
= list_first_entry(&ifmsh
->preq_queue
.list
,
698 struct mesh_preq_queue
, list
);
699 list_del(&preq_node
->list
);
700 --ifmsh
->preq_queue_len
;
701 spin_unlock(&ifmsh
->mesh_preq_queue_lock
);
704 mpath
= mesh_path_lookup(preq_node
->dst
, sdata
);
708 spin_lock_bh(&mpath
->state_lock
);
709 if (preq_node
->flags
& PREQ_Q_F_START
) {
710 if (mpath
->flags
& MESH_PATH_RESOLVING
) {
711 spin_unlock_bh(&mpath
->state_lock
);
714 mpath
->flags
&= ~MESH_PATH_RESOLVED
;
715 mpath
->flags
|= MESH_PATH_RESOLVING
;
716 mpath
->discovery_retries
= 0;
717 mpath
->discovery_timeout
= disc_timeout_jiff(sdata
);
719 } else if (!(mpath
->flags
& MESH_PATH_RESOLVING
) ||
720 mpath
->flags
& MESH_PATH_RESOLVED
) {
721 mpath
->flags
&= ~MESH_PATH_RESOLVING
;
722 spin_unlock_bh(&mpath
->state_lock
);
726 ifmsh
->last_preq
= jiffies
;
728 if (time_after(jiffies
, ifmsh
->last_dsn_update
+
729 net_traversal_jiffies(sdata
)) ||
730 time_before(jiffies
, ifmsh
->last_dsn_update
)) {
732 sdata
->u
.mesh
.last_dsn_update
= jiffies
;
734 lifetime
= default_lifetime(sdata
);
735 ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
737 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
738 spin_unlock_bh(&mpath
->state_lock
);
742 if (preq_node
->flags
& PREQ_Q_F_REFRESH
)
747 spin_unlock_bh(&mpath
->state_lock
);
748 mesh_path_sel_frame_tx(MPATH_PREQ
, 0, sdata
->dev
->dev_addr
,
749 cpu_to_le32(ifmsh
->dsn
), dst_flags
, mpath
->dst
,
750 cpu_to_le32(mpath
->dsn
), sdata
->dev
->broadcast
, 0,
751 ttl
, cpu_to_le32(lifetime
), 0,
752 cpu_to_le32(ifmsh
->preq_id
++), sdata
);
753 mod_timer(&mpath
->timer
, jiffies
+ mpath
->discovery_timeout
);
761 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame
763 * @skb: 802.11 frame to be sent
764 * @sdata: network subif the frame will be sent through
766 * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is
767 * found, the function will start a path discovery and queue the frame so it is
768 * sent when the path is resolved. This means the caller must not free the skb
771 int mesh_nexthop_lookup(struct sk_buff
*skb
,
772 struct ieee80211_sub_if_data
*sdata
)
774 struct sk_buff
*skb_to_free
= NULL
;
775 struct mesh_path
*mpath
;
776 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
777 u8
*dst_addr
= hdr
->addr3
;
781 mpath
= mesh_path_lookup(dst_addr
, sdata
);
784 mesh_path_add(dst_addr
, sdata
);
785 mpath
= mesh_path_lookup(dst_addr
, sdata
);
788 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
794 if (mpath
->flags
& MESH_PATH_ACTIVE
) {
795 if (time_after(jiffies
, mpath
->exp_time
-
796 msecs_to_jiffies(sdata
->u
.mesh
.mshcfg
.path_refresh_time
))
797 && !memcmp(sdata
->dev
->dev_addr
, hdr
->addr4
,
799 && !(mpath
->flags
& MESH_PATH_RESOLVING
)
800 && !(mpath
->flags
& MESH_PATH_FIXED
)) {
801 mesh_queue_preq(mpath
,
802 PREQ_Q_F_START
| PREQ_Q_F_REFRESH
);
804 memcpy(hdr
->addr1
, mpath
->next_hop
->sta
.addr
,
807 if (!(mpath
->flags
& MESH_PATH_RESOLVING
)) {
808 /* Start discovery only if it is not running yet */
809 mesh_queue_preq(mpath
, PREQ_Q_F_START
);
812 if (skb_queue_len(&mpath
->frame_queue
) >=
813 MESH_FRAME_QUEUE_LEN
) {
814 skb_to_free
= mpath
->frame_queue
.next
;
815 skb_unlink(skb_to_free
, &mpath
->frame_queue
);
818 skb_queue_tail(&mpath
->frame_queue
, skb
);
820 mesh_path_discard_frame(skb_to_free
, sdata
);
829 void mesh_path_timer(unsigned long data
)
831 struct ieee80211_sub_if_data
*sdata
;
832 struct mesh_path
*mpath
;
835 mpath
= (struct mesh_path
*) data
;
836 mpath
= rcu_dereference(mpath
);
839 sdata
= mpath
->sdata
;
841 if (sdata
->local
->quiescing
) {
846 spin_lock_bh(&mpath
->state_lock
);
847 if (mpath
->flags
& MESH_PATH_RESOLVED
||
848 (!(mpath
->flags
& MESH_PATH_RESOLVING
)))
849 mpath
->flags
&= ~(MESH_PATH_RESOLVING
| MESH_PATH_RESOLVED
);
850 else if (mpath
->discovery_retries
< max_preq_retries(sdata
)) {
851 ++mpath
->discovery_retries
;
852 mpath
->discovery_timeout
*= 2;
853 mesh_queue_preq(mpath
, 0);
856 mpath
->exp_time
= jiffies
;
857 mesh_path_flush_pending(mpath
);
860 spin_unlock_bh(&mpath
->state_lock
);