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.
10 #include <asm/unaligned.h>
13 #define IEEE80211_FC(type, stype) cpu_to_le16(type | stype)
15 #define TEST_FRAME_LEN 8192
16 #define MAX_METRIC 0xffffffff
19 /* Number of frames buffered per destination for unresolved destinations */
20 #define MESH_FRAME_QUEUE_LEN 10
21 #define MAX_PREQ_QUEUE_LEN 64
23 /* Destination only */
25 /* Reply and forward */
28 static inline u32
u32_field_get(u8
*preq_elem
, int offset
, bool ae
)
32 return le32_to_cpu(get_unaligned((__le32
*) (preq_elem
+ offset
)));
35 /* HWMP IE processing macros */
37 #define AE_F_SET(x) (*x & AE_F)
38 #define PREQ_IE_FLAGS(x) (*(x))
39 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
40 #define PREQ_IE_TTL(x) (*(x + 2))
41 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
42 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
43 #define PREQ_IE_ORIG_DSN(x) u32_field_get(x, 13, 0);
44 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x));
45 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x));
46 #define PREQ_IE_DST_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
47 #define PREQ_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
48 #define PREQ_IE_DST_DSN(x) u32_field_get(x, 33, AE_F_SET(x));
51 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
52 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
53 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
54 #define PREP_IE_ORIG_ADDR(x) (x + 3)
55 #define PREP_IE_ORIG_DSN(x) u32_field_get(x, 9, 0);
56 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x));
57 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x));
58 #define PREP_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
59 #define PREP_IE_DST_DSN(x) u32_field_get(x, 27, AE_F_SET(x));
61 #define PERR_IE_DST_ADDR(x) (x + 2)
62 #define PERR_IE_DST_DSN(x) u32_field_get(x, 8, 0);
64 #define TU_TO_EXP_TIME(x) (jiffies + msecs_to_jiffies(x * 1024 / 1000))
65 #define MSEC_TO_TU(x) (x*1000/1024)
66 #define DSN_GT(x, y) ((long) (y) - (long) (x) < 0)
67 #define DSN_LT(x, y) ((long) (x) - (long) (y) < 0)
69 #define net_traversal_jiffies(s) \
70 msecs_to_jiffies(s->u.sta.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
71 #define default_lifetime(s) \
72 MSEC_TO_TU(s->u.sta.mshcfg.dot11MeshHWMPactivePathTimeout)
73 #define min_preq_int_jiff(s) \
74 (msecs_to_jiffies(s->u.sta.mshcfg.dot11MeshHWMPpreqMinInterval))
75 #define max_preq_retries(s) (s->u.sta.mshcfg.dot11MeshHWMPmaxPREQretries)
76 #define disc_timeout_jiff(s) \
77 msecs_to_jiffies(sdata->u.sta.mshcfg.min_discovery_timeout)
79 enum mpath_frame_type
{
85 static int mesh_path_sel_frame_tx(enum mpath_frame_type action
, u8 flags
,
86 u8
*orig_addr
, __le32 orig_dsn
, u8 dst_flags
, u8
*dst
,
87 __le32 dst_dsn
, u8
*da
, u8 hop_count
, u8 ttl
, __le32 lifetime
,
88 __le32 metric
, __le32 preq_id
, struct net_device
*dev
)
90 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
91 struct sk_buff
*skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ 400);
92 struct ieee80211_mgmt
*mgmt
;
98 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
99 /* 25 is the size of the common mgmt part (24) plus the size of the
100 * common action part (1)
102 mgmt
= (struct ieee80211_mgmt
*)
103 skb_put(skb
, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
104 memset(mgmt
, 0, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
105 mgmt
->frame_control
= IEEE80211_FC(IEEE80211_FTYPE_MGMT
,
106 IEEE80211_STYPE_ACTION
);
108 memcpy(mgmt
->da
, da
, ETH_ALEN
);
109 memcpy(mgmt
->sa
, dev
->dev_addr
, ETH_ALEN
);
110 /* BSSID is left zeroed, wildcard value */
111 mgmt
->u
.action
.category
= MESH_PATH_SEL_CATEGORY
;
112 mgmt
->u
.action
.u
.mesh_action
.action_code
= action
;
117 pos
= skb_put(skb
, 2 + ie_len
);
118 *pos
++ = WLAN_EID_PREQ
;
122 pos
= skb_put(skb
, 2 + ie_len
);
123 *pos
++ = WLAN_EID_PREP
;
134 if (action
== MPATH_PREQ
) {
135 memcpy(pos
, &preq_id
, 4);
138 memcpy(pos
, orig_addr
, ETH_ALEN
);
140 memcpy(pos
, &orig_dsn
, 4);
142 memcpy(pos
, &lifetime
, 4);
144 memcpy(pos
, &metric
, 4);
146 if (action
== MPATH_PREQ
) {
147 /* destination count */
151 memcpy(pos
, dst
, ETH_ALEN
);
153 memcpy(pos
, &dst_dsn
, 4);
155 ieee80211_sta_tx(dev
, skb
, 0);
160 * mesh_send_path error - Sends a PERR mesh management frame
162 * @dst: broken destination
163 * @dst_dsn: dsn of the broken destination
164 * @ra: node this frame is addressed to
166 int mesh_path_error_tx(u8
*dst
, __le32 dst_dsn
, u8
*ra
,
167 struct net_device
*dev
)
169 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
170 struct sk_buff
*skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ 400);
171 struct ieee80211_mgmt
*mgmt
;
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)
181 mgmt
= (struct ieee80211_mgmt
*)
182 skb_put(skb
, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
183 memset(mgmt
, 0, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
184 mgmt
->frame_control
= IEEE80211_FC(IEEE80211_FTYPE_MGMT
,
185 IEEE80211_STYPE_ACTION
);
187 memcpy(mgmt
->da
, ra
, ETH_ALEN
);
188 memcpy(mgmt
->sa
, dev
->dev_addr
, ETH_ALEN
);
189 /* BSSID is left zeroed, wildcard value */
190 mgmt
->u
.action
.category
= MESH_PATH_SEL_CATEGORY
;
191 mgmt
->u
.action
.u
.mesh_action
.action_code
= MPATH_PERR
;
193 pos
= skb_put(skb
, 2 + ie_len
);
194 *pos
++ = WLAN_EID_PERR
;
196 /* mode flags, reserved */
198 /* number of destinations */
200 memcpy(pos
, dst
, ETH_ALEN
);
202 memcpy(pos
, &dst_dsn
, 4);
204 ieee80211_sta_tx(dev
, skb
, 0);
208 static u32
airtime_link_metric_get(struct ieee80211_local
*local
,
209 struct sta_info
*sta
)
211 struct ieee80211_supported_band
*sband
;
212 /* This should be adjusted for each device */
213 int device_constant
= 1 << ARITH_SHIFT
;
214 int test_frame_len
= TEST_FRAME_LEN
<< ARITH_SHIFT
;
215 int s_unit
= 1 << ARITH_SHIFT
;
217 u32 tx_time
, estimated_retx
;
220 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
222 if (sta
->fail_avg
>= 100)
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
->txrate_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 * @dev: local mesh interface
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 net_device
*dev
,
253 struct ieee80211_mgmt
*mgmt
,
256 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
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
, 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
, dev
);
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
, dev
);
331 mpath
= mesh_path_lookup(orig_addr
, dev
);
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
, dev
);
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
, dev
);
372 mpath
= mesh_path_lookup(ta
, dev
);
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 net_device
*dev
,
399 struct ieee80211_mgmt
*mgmt
,
400 u8
*preq_elem
, u32 metric
) {
401 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
402 struct ieee80211_if_sta
*ifsta
= &sdata
->u
.sta
;
403 struct mesh_path
*mpath
;
404 u8
*dst_addr
, *orig_addr
;
406 u32 orig_dsn
, dst_dsn
, lifetime
;
410 /* Update destination DSN, if present */
411 dst_addr
= PREQ_IE_DST_ADDR(preq_elem
);
412 orig_addr
= PREQ_IE_ORIG_ADDR(preq_elem
);
413 dst_dsn
= PREQ_IE_DST_DSN(preq_elem
);
414 orig_dsn
= PREQ_IE_ORIG_DSN(preq_elem
);
415 dst_flags
= PREQ_IE_DST_F(preq_elem
);
417 if (memcmp(dst_addr
, dev
->dev_addr
, ETH_ALEN
) == 0) {
421 if (time_after(jiffies
, ifsta
->last_dsn_update
+
422 net_traversal_jiffies(sdata
)) ||
423 time_before(jiffies
, ifsta
->last_dsn_update
)) {
424 dst_dsn
= ++ifsta
->dsn
;
425 ifsta
->last_dsn_update
= jiffies
;
429 mpath
= mesh_path_lookup(dst_addr
, dev
);
431 if ((!(mpath
->flags
& MESH_PATH_DSN_VALID
)) ||
432 DSN_LT(mpath
->dsn
, dst_dsn
)) {
433 mpath
->dsn
= dst_dsn
;
434 mpath
->flags
&= MESH_PATH_DSN_VALID
;
435 } else if ((!(dst_flags
& MP_F_DO
)) &&
436 (mpath
->flags
& MESH_PATH_ACTIVE
)) {
438 metric
= mpath
->metric
;
439 dst_dsn
= mpath
->dsn
;
440 if (dst_flags
& MP_F_RF
)
441 dst_flags
|= MP_F_DO
;
450 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
451 ttl
= ifsta
->mshcfg
.dot11MeshTTL
;
453 mesh_path_sel_frame_tx(MPATH_PREP
, 0, dst_addr
,
454 cpu_to_le32(dst_dsn
), 0, orig_addr
,
455 cpu_to_le32(orig_dsn
), mgmt
->sa
, 0, ttl
,
456 cpu_to_le32(lifetime
), cpu_to_le32(metric
),
459 ifsta
->mshstats
.dropped_frames_ttl
++;
466 ttl
= PREQ_IE_TTL(preq_elem
);
467 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
469 ifsta
->mshstats
.dropped_frames_ttl
++;
473 flags
= PREQ_IE_FLAGS(preq_elem
);
474 preq_id
= PREQ_IE_PREQ_ID(preq_elem
);
475 hopcount
= PREQ_IE_HOPCOUNT(preq_elem
) + 1;
476 mesh_path_sel_frame_tx(MPATH_PREQ
, flags
, orig_addr
,
477 cpu_to_le32(orig_dsn
), dst_flags
, dst_addr
,
478 cpu_to_le32(dst_dsn
), dev
->broadcast
,
479 hopcount
, ttl
, cpu_to_le32(lifetime
),
480 cpu_to_le32(metric
), cpu_to_le32(preq_id
),
482 ifsta
->mshstats
.fwded_frames
++;
487 static void hwmp_prep_frame_process(struct net_device
*dev
,
488 struct ieee80211_mgmt
*mgmt
,
489 u8
*prep_elem
, u32 metric
)
491 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
492 struct mesh_path
*mpath
;
493 u8
*dst_addr
, *orig_addr
;
494 u8 ttl
, hopcount
, flags
;
495 u8 next_hop
[ETH_ALEN
];
496 u32 dst_dsn
, orig_dsn
, lifetime
;
498 /* Note that we divert from the draft nomenclature and denominate
499 * destination to what the draft refers to as origininator. So in this
500 * function destnation refers to the final destination of the PREP,
501 * which corresponds with the originator of the PREQ which this PREP
504 dst_addr
= PREP_IE_DST_ADDR(prep_elem
);
505 if (memcmp(dst_addr
, dev
->dev_addr
, ETH_ALEN
) == 0)
506 /* destination, no forwarding required */
509 ttl
= PREP_IE_TTL(prep_elem
);
511 sdata
->u
.sta
.mshstats
.dropped_frames_ttl
++;
516 mpath
= mesh_path_lookup(dst_addr
, dev
);
518 spin_lock_bh(&mpath
->state_lock
);
521 if (!(mpath
->flags
& MESH_PATH_ACTIVE
)) {
522 spin_unlock_bh(&mpath
->state_lock
);
525 memcpy(next_hop
, mpath
->next_hop
->addr
, ETH_ALEN
);
526 spin_unlock_bh(&mpath
->state_lock
);
528 flags
= PREP_IE_FLAGS(prep_elem
);
529 lifetime
= PREP_IE_LIFETIME(prep_elem
);
530 hopcount
= PREP_IE_HOPCOUNT(prep_elem
) + 1;
531 orig_addr
= PREP_IE_ORIG_ADDR(prep_elem
);
532 dst_dsn
= PREP_IE_DST_DSN(prep_elem
);
533 orig_dsn
= PREP_IE_ORIG_DSN(prep_elem
);
535 mesh_path_sel_frame_tx(MPATH_PREP
, flags
, orig_addr
,
536 cpu_to_le32(orig_dsn
), 0, dst_addr
,
537 cpu_to_le32(dst_dsn
), mpath
->next_hop
->addr
, hopcount
, ttl
,
538 cpu_to_le32(lifetime
), cpu_to_le32(metric
),
541 sdata
->u
.sta
.mshstats
.fwded_frames
++;
546 sdata
->u
.sta
.mshstats
.dropped_frames_no_route
++;
550 static void hwmp_perr_frame_process(struct net_device
*dev
,
551 struct ieee80211_mgmt
*mgmt
, u8
*perr_elem
)
553 struct mesh_path
*mpath
;
558 dst_addr
= PERR_IE_DST_ADDR(perr_elem
);
559 dst_dsn
= PERR_IE_DST_DSN(perr_elem
);
561 mpath
= mesh_path_lookup(dst_addr
, dev
);
563 spin_lock_bh(&mpath
->state_lock
);
564 if (mpath
->flags
& MESH_PATH_ACTIVE
&&
565 memcmp(ta
, mpath
->next_hop
->addr
, ETH_ALEN
) == 0 &&
566 (!(mpath
->flags
& MESH_PATH_DSN_VALID
) ||
567 DSN_GT(dst_dsn
, mpath
->dsn
))) {
568 mpath
->flags
&= ~MESH_PATH_ACTIVE
;
569 mpath
->dsn
= dst_dsn
;
570 spin_unlock_bh(&mpath
->state_lock
);
571 mesh_path_error_tx(dst_addr
, cpu_to_le32(dst_dsn
),
572 dev
->broadcast
, dev
);
574 spin_unlock_bh(&mpath
->state_lock
);
581 void mesh_rx_path_sel_frame(struct net_device
*dev
,
582 struct ieee80211_mgmt
*mgmt
,
585 struct ieee802_11_elems elems
;
589 baselen
= (u8
*) mgmt
->u
.action
.u
.mesh_action
.variable
- (u8
*) mgmt
;
590 ieee802_11_parse_elems(mgmt
->u
.action
.u
.mesh_action
.variable
,
591 len
- baselen
, &elems
);
593 switch (mgmt
->u
.action
.u
.mesh_action
.action_code
) {
595 if (!elems
.preq
|| elems
.preq_len
!= 37)
596 /* Right now we support just 1 destination and no AE */
598 last_hop_metric
= hwmp_route_info_get(dev
, mgmt
, elems
.preq
);
599 if (!last_hop_metric
)
601 hwmp_preq_frame_process(dev
, mgmt
, elems
.preq
, last_hop_metric
);
604 if (!elems
.prep
|| elems
.prep_len
!= 31)
605 /* Right now we support no AE */
607 last_hop_metric
= hwmp_route_info_get(dev
, mgmt
, elems
.prep
);
608 if (!last_hop_metric
)
610 hwmp_prep_frame_process(dev
, mgmt
, elems
.prep
, last_hop_metric
);
613 if (!elems
.perr
|| elems
.perr_len
!= 12)
614 /* Right now we support only one destination per PERR */
616 hwmp_perr_frame_process(dev
, mgmt
, elems
.perr
);
624 * mesh_queue_preq - queue a PREQ to a given destination
626 * @mpath: mesh path to discover
627 * @flags: special attributes of the PREQ to be sent
629 * Locking: the function must be called from within a rcu read lock block.
632 static void mesh_queue_preq(struct mesh_path
*mpath
, u8 flags
)
634 struct ieee80211_sub_if_data
*sdata
=
635 IEEE80211_DEV_TO_SUB_IF(mpath
->dev
);
636 struct ieee80211_if_sta
*ifsta
= &sdata
->u
.sta
;
637 struct mesh_preq_queue
*preq_node
;
639 preq_node
= kmalloc(sizeof(struct mesh_preq_queue
), GFP_KERNEL
);
641 printk(KERN_DEBUG
"Mesh HWMP: could not allocate PREQ node\n");
645 spin_lock(&ifsta
->mesh_preq_queue_lock
);
646 if (ifsta
->preq_queue_len
== MAX_PREQ_QUEUE_LEN
) {
647 spin_unlock(&ifsta
->mesh_preq_queue_lock
);
649 if (printk_ratelimit())
650 printk(KERN_DEBUG
"Mesh HWMP: PREQ node queue full\n");
654 memcpy(preq_node
->dst
, mpath
->dst
, ETH_ALEN
);
655 preq_node
->flags
= flags
;
657 list_add_tail(&preq_node
->list
, &ifsta
->preq_queue
.list
);
658 ++ifsta
->preq_queue_len
;
659 spin_unlock(&ifsta
->mesh_preq_queue_lock
);
661 if (time_after(jiffies
, ifsta
->last_preq
+ min_preq_int_jiff(sdata
)))
662 queue_work(sdata
->local
->hw
.workqueue
, &ifsta
->work
);
664 else if (time_before(jiffies
, ifsta
->last_preq
)) {
665 /* avoid long wait if did not send preqs for a long time
666 * and jiffies wrapped around
668 ifsta
->last_preq
= jiffies
- min_preq_int_jiff(sdata
) - 1;
669 queue_work(sdata
->local
->hw
.workqueue
, &ifsta
->work
);
671 mod_timer(&ifsta
->mesh_path_timer
, ifsta
->last_preq
+
672 min_preq_int_jiff(sdata
));
676 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
678 * @dev: local mesh interface
680 void mesh_path_start_discovery(struct net_device
*dev
)
682 struct ieee80211_sub_if_data
*sdata
=
683 IEEE80211_DEV_TO_SUB_IF(dev
);
684 struct ieee80211_if_sta
*ifsta
= &sdata
->u
.sta
;
685 struct mesh_preq_queue
*preq_node
;
686 struct mesh_path
*mpath
;
690 spin_lock(&ifsta
->mesh_preq_queue_lock
);
691 if (!ifsta
->preq_queue_len
||
692 time_before(jiffies
, ifsta
->last_preq
+
693 min_preq_int_jiff(sdata
))) {
694 spin_unlock(&ifsta
->mesh_preq_queue_lock
);
698 preq_node
= list_first_entry(&ifsta
->preq_queue
.list
,
699 struct mesh_preq_queue
, list
);
700 list_del(&preq_node
->list
);
701 --ifsta
->preq_queue_len
;
702 spin_unlock(&ifsta
->mesh_preq_queue_lock
);
705 mpath
= mesh_path_lookup(preq_node
->dst
, dev
);
709 spin_lock_bh(&mpath
->state_lock
);
710 if (preq_node
->flags
& PREQ_Q_F_START
) {
711 if (mpath
->flags
& MESH_PATH_RESOLVING
) {
712 spin_unlock_bh(&mpath
->state_lock
);
715 mpath
->flags
&= ~MESH_PATH_RESOLVED
;
716 mpath
->flags
|= MESH_PATH_RESOLVING
;
717 mpath
->discovery_retries
= 0;
718 mpath
->discovery_timeout
= disc_timeout_jiff(sdata
);
720 } else if (!(mpath
->flags
& MESH_PATH_RESOLVING
) ||
721 mpath
->flags
& MESH_PATH_RESOLVED
) {
722 mpath
->flags
&= ~MESH_PATH_RESOLVING
;
723 spin_unlock_bh(&mpath
->state_lock
);
727 ifsta
->last_preq
= jiffies
;
729 if (time_after(jiffies
, ifsta
->last_dsn_update
+
730 net_traversal_jiffies(sdata
)) ||
731 time_before(jiffies
, ifsta
->last_dsn_update
)) {
733 sdata
->u
.sta
.last_dsn_update
= jiffies
;
735 lifetime
= default_lifetime(sdata
);
736 ttl
= sdata
->u
.sta
.mshcfg
.dot11MeshTTL
;
738 sdata
->u
.sta
.mshstats
.dropped_frames_ttl
++;
739 spin_unlock_bh(&mpath
->state_lock
);
743 if (preq_node
->flags
& PREQ_Q_F_REFRESH
)
748 spin_unlock_bh(&mpath
->state_lock
);
749 mesh_path_sel_frame_tx(MPATH_PREQ
, 0, dev
->dev_addr
,
750 cpu_to_le32(ifsta
->dsn
), dst_flags
, mpath
->dst
,
751 cpu_to_le32(mpath
->dsn
), dev
->broadcast
, 0,
752 ttl
, cpu_to_le32(lifetime
), 0,
753 cpu_to_le32(ifsta
->preq_id
++), dev
);
754 mod_timer(&mpath
->timer
, jiffies
+ mpath
->discovery_timeout
);
762 * ieee80211s_lookup_nexthop - put the appropriate next hop on a mesh frame
764 * @next_hop: output argument for next hop address
765 * @skb: frame to be sent
766 * @dev: network device the frame will be sent through
768 * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is
769 * found, the function will start a path discovery and queue the frame so it is
770 * sent when the path is resolved. This means the caller must not free the skb
773 int mesh_nexthop_lookup(u8
*next_hop
, struct sk_buff
*skb
,
774 struct net_device
*dev
)
776 struct ieee80211_sub_if_data
*sdata
= IEEE80211_DEV_TO_SUB_IF(dev
);
777 struct sk_buff
*skb_to_free
= NULL
;
778 struct mesh_path
*mpath
;
782 mpath
= mesh_path_lookup(skb
->data
, dev
);
785 mesh_path_add(skb
->data
, dev
);
786 mpath
= mesh_path_lookup(skb
->data
, dev
);
789 sdata
->u
.sta
.mshstats
.dropped_frames_no_route
++;
795 if (mpath
->flags
& MESH_PATH_ACTIVE
) {
796 if (time_after(jiffies
, mpath
->exp_time
-
797 msecs_to_jiffies(sdata
->u
.sta
.mshcfg
.path_refresh_time
))
798 && skb
->pkt_type
!= PACKET_OTHERHOST
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(next_hop
, mpath
->next_hop
->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
, dev
);
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 spin_lock_bh(&mpath
->state_lock
);
840 sdata
= IEEE80211_DEV_TO_SUB_IF(mpath
->dev
);
841 if (mpath
->flags
& MESH_PATH_RESOLVED
||
842 (!(mpath
->flags
& MESH_PATH_RESOLVING
)))
843 mpath
->flags
&= ~(MESH_PATH_RESOLVING
| MESH_PATH_RESOLVED
);
844 else if (mpath
->discovery_retries
< max_preq_retries(sdata
)) {
845 ++mpath
->discovery_retries
;
846 mpath
->discovery_timeout
*= 2;
847 mesh_queue_preq(mpath
, 0);
850 mpath
->exp_time
= jiffies
;
851 mesh_path_flush_pending(mpath
);
854 spin_unlock_bh(&mpath
->state_lock
);