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.
12 #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG
13 #define mhwmp_dbg(fmt, args...) printk(KERN_DEBUG "Mesh HWMP: " fmt, ##args)
15 #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0)
18 #define TEST_FRAME_LEN 8192
19 #define MAX_METRIC 0xffffffff
22 /* Number of frames buffered per destination for unresolved destinations */
23 #define MESH_FRAME_QUEUE_LEN 10
24 #define MAX_PREQ_QUEUE_LEN 64
26 /* Destination only */
28 /* Reply and forward */
30 /* Unknown Sequence Number */
32 /* Reason code Present */
33 #define MP_F_RCODE 0x02
35 static void mesh_queue_preq(struct mesh_path
*, u8
);
37 static inline u32
u32_field_get(u8
*preq_elem
, int offset
, bool ae
)
41 return get_unaligned_le32(preq_elem
+ offset
);
44 static inline u32
u16_field_get(u8
*preq_elem
, int offset
, bool ae
)
48 return get_unaligned_le16(preq_elem
+ offset
);
51 /* HWMP IE processing macros */
53 #define AE_F_SET(x) (*x & AE_F)
54 #define PREQ_IE_FLAGS(x) (*(x))
55 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
56 #define PREQ_IE_TTL(x) (*(x + 2))
57 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
58 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
59 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0);
60 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x));
61 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x));
62 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
63 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
64 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x));
67 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
68 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
69 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
70 #define PREP_IE_ORIG_ADDR(x) (x + 3)
71 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 9, 0);
72 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x));
73 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x));
74 #define PREP_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
75 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 27, AE_F_SET(x));
77 #define PERR_IE_TTL(x) (*(x))
78 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
79 #define PERR_IE_TARGET_ADDR(x) (x + 3)
80 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0);
81 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0);
83 #define MSEC_TO_TU(x) (x*1000/1024)
84 #define SN_GT(x, y) ((long) (y) - (long) (x) < 0)
85 #define SN_LT(x, y) ((long) (x) - (long) (y) < 0)
87 #define net_traversal_jiffies(s) \
88 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
89 #define default_lifetime(s) \
90 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
91 #define min_preq_int_jiff(s) \
92 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
93 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
94 #define disc_timeout_jiff(s) \
95 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
97 enum mpath_frame_type
{
104 static int mesh_path_sel_frame_tx(enum mpath_frame_type action
, u8 flags
,
105 u8
*orig_addr
, __le32 orig_sn
, u8 target_flags
, u8
*target
,
106 __le32 target_sn
, u8
*da
, u8 hop_count
, u8 ttl
,__le32 lifetime
,
107 __le32 metric
, __le32 preq_id
,
108 struct ieee80211_sub_if_data
*sdata
)
110 struct ieee80211_local
*local
= sdata
->local
;
111 struct sk_buff
*skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ 400);
112 struct ieee80211_mgmt
*mgmt
;
118 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
119 /* 25 is the size of the common mgmt part (24) plus the size of the
120 * common action part (1)
122 mgmt
= (struct ieee80211_mgmt
*)
123 skb_put(skb
, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
124 memset(mgmt
, 0, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
125 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
126 IEEE80211_STYPE_ACTION
);
128 memcpy(mgmt
->da
, da
, ETH_ALEN
);
129 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
131 memcpy(mgmt
->bssid
, sdata
->dev
->dev_addr
, ETH_ALEN
);
132 mgmt
->u
.action
.category
= MESH_PATH_SEL_CATEGORY
;
133 mgmt
->u
.action
.u
.mesh_action
.action_code
= MESH_PATH_SEL_ACTION
;
137 mhwmp_dbg("sending PREQ to %pM\n", target
);
139 pos
= skb_put(skb
, 2 + ie_len
);
140 *pos
++ = WLAN_EID_PREQ
;
143 mhwmp_dbg("sending PREP to %pM\n", target
);
145 pos
= skb_put(skb
, 2 + ie_len
);
146 *pos
++ = WLAN_EID_PREP
;
149 mhwmp_dbg("sending RANN from %pM\n", orig_addr
);
150 ie_len
= sizeof(struct ieee80211_rann_ie
);
151 pos
= skb_put(skb
, 2 + ie_len
);
152 *pos
++ = WLAN_EID_RANN
;
163 if (action
== MPATH_PREQ
) {
164 memcpy(pos
, &preq_id
, 4);
167 memcpy(pos
, orig_addr
, ETH_ALEN
);
169 memcpy(pos
, &orig_sn
, 4);
171 if (action
!= MPATH_RANN
) {
172 memcpy(pos
, &lifetime
, 4);
175 memcpy(pos
, &metric
, 4);
177 if (action
== MPATH_PREQ
) {
178 /* destination count */
180 *pos
++ = target_flags
;
182 if (action
!= MPATH_RANN
) {
183 memcpy(pos
, target
, ETH_ALEN
);
185 memcpy(pos
, &target_sn
, 4);
188 ieee80211_tx_skb(sdata
, skb
, 1);
193 * mesh_send_path error - Sends a PERR mesh management frame
195 * @target: broken destination
196 * @target_sn: SN of the broken destination
197 * @target_rcode: reason code for this PERR
198 * @ra: node this frame is addressed to
200 int mesh_path_error_tx(u8 ttl
, u8
*target
, __le32 target_sn
,
201 __le16 target_rcode
, u8
*ra
,
202 struct ieee80211_sub_if_data
*sdata
)
204 struct ieee80211_local
*local
= sdata
->local
;
205 struct sk_buff
*skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ 400);
206 struct ieee80211_mgmt
*mgmt
;
212 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
213 /* 25 is the size of the common mgmt part (24) plus the size of the
214 * common action part (1)
216 mgmt
= (struct ieee80211_mgmt
*)
217 skb_put(skb
, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
218 memset(mgmt
, 0, 25 + sizeof(mgmt
->u
.action
.u
.mesh_action
));
219 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
220 IEEE80211_STYPE_ACTION
);
222 memcpy(mgmt
->da
, ra
, ETH_ALEN
);
223 memcpy(mgmt
->sa
, sdata
->dev
->dev_addr
, ETH_ALEN
);
224 /* BSSID is left zeroed, wildcard value */
225 mgmt
->u
.action
.category
= MESH_PATH_SEL_CATEGORY
;
226 mgmt
->u
.action
.u
.mesh_action
.action_code
= MESH_PATH_SEL_ACTION
;
228 pos
= skb_put(skb
, 2 + ie_len
);
229 *pos
++ = WLAN_EID_PERR
;
233 /* number of destinations */
236 * flags bit, bit 1 is unset if we know the sequence number and
237 * bit 2 is set if we have a reason code
245 memcpy(pos
, target
, ETH_ALEN
);
247 memcpy(pos
, &target_sn
, 4);
249 memcpy(pos
, &target_rcode
, 2);
251 ieee80211_tx_skb(sdata
, skb
, 1);
255 void ieee80211s_update_metric(struct ieee80211_local
*local
,
256 struct sta_info
*stainfo
, struct sk_buff
*skb
)
258 struct ieee80211_tx_info
*txinfo
= IEEE80211_SKB_CB(skb
);
259 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
262 if (!ieee80211_is_data(hdr
->frame_control
))
265 failed
= !(txinfo
->flags
& IEEE80211_TX_STAT_ACK
);
267 /* moving average, scaled to 100 */
268 stainfo
->fail_avg
= ((80 * stainfo
->fail_avg
+ 5) / 100 + 20 * failed
);
269 if (stainfo
->fail_avg
> 95)
270 mesh_plink_broken(stainfo
);
273 static u32
airtime_link_metric_get(struct ieee80211_local
*local
,
274 struct sta_info
*sta
)
276 struct ieee80211_supported_band
*sband
;
277 /* This should be adjusted for each device */
278 int device_constant
= 1 << ARITH_SHIFT
;
279 int test_frame_len
= TEST_FRAME_LEN
<< ARITH_SHIFT
;
280 int s_unit
= 1 << ARITH_SHIFT
;
282 u32 tx_time
, estimated_retx
;
285 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
287 if (sta
->fail_avg
>= 100)
290 if (sta
->last_tx_rate
.flags
& IEEE80211_TX_RC_MCS
)
293 err
= (sta
->fail_avg
<< ARITH_SHIFT
) / 100;
295 /* bitrate is in units of 100 Kbps, while we need rate in units of
296 * 1Mbps. This will be corrected on tx_time computation.
298 rate
= sband
->bitrates
[sta
->last_tx_rate
.idx
].bitrate
;
299 tx_time
= (device_constant
+ 10 * test_frame_len
/ rate
);
300 estimated_retx
= ((1 << (2 * ARITH_SHIFT
)) / (s_unit
- err
));
301 result
= (tx_time
* estimated_retx
) >> (2 * ARITH_SHIFT
) ;
306 * hwmp_route_info_get - Update routing info to originator and transmitter
308 * @sdata: local mesh subif
309 * @mgmt: mesh management frame
310 * @hwmp_ie: hwmp information element (PREP or PREQ)
312 * This function updates the path routing information to the originator and the
313 * transmitter of a HWMP PREQ or PREP frame.
315 * Returns: metric to frame originator or 0 if the frame should not be further
318 * Notes: this function is the only place (besides user-provided info) where
319 * path routing information is updated.
321 static u32
hwmp_route_info_get(struct ieee80211_sub_if_data
*sdata
,
322 struct ieee80211_mgmt
*mgmt
,
323 u8
*hwmp_ie
, enum mpath_frame_type action
)
325 struct ieee80211_local
*local
= sdata
->local
;
326 struct mesh_path
*mpath
;
327 struct sta_info
*sta
;
330 u32 orig_sn
, orig_metric
;
331 unsigned long orig_lifetime
, exp_time
;
332 u32 last_hop_metric
, new_metric
;
336 sta
= sta_info_get(local
, mgmt
->sa
);
342 last_hop_metric
= airtime_link_metric_get(local
, sta
);
343 /* Update and check originator routing info */
348 orig_addr
= PREQ_IE_ORIG_ADDR(hwmp_ie
);
349 orig_sn
= PREQ_IE_ORIG_SN(hwmp_ie
);
350 orig_lifetime
= PREQ_IE_LIFETIME(hwmp_ie
);
351 orig_metric
= PREQ_IE_METRIC(hwmp_ie
);
354 /* Originator here refers to the MP that was the destination in
355 * the Path Request. The draft refers to that MP as the
356 * destination address, even though usually it is the origin of
357 * the PREP frame. We divert from the nomenclature in the draft
358 * so that we can easily use a single function to gather path
359 * information from both PREQ and PREP frames.
361 orig_addr
= PREP_IE_ORIG_ADDR(hwmp_ie
);
362 orig_sn
= PREP_IE_ORIG_SN(hwmp_ie
);
363 orig_lifetime
= PREP_IE_LIFETIME(hwmp_ie
);
364 orig_metric
= PREP_IE_METRIC(hwmp_ie
);
370 new_metric
= orig_metric
+ last_hop_metric
;
371 if (new_metric
< orig_metric
)
372 new_metric
= MAX_METRIC
;
373 exp_time
= TU_TO_EXP_TIME(orig_lifetime
);
375 if (memcmp(orig_addr
, sdata
->dev
->dev_addr
, ETH_ALEN
) == 0) {
376 /* This MP is the originator, we are not interested in this
377 * frame, except for updating transmitter's path info.
382 mpath
= mesh_path_lookup(orig_addr
, sdata
);
384 spin_lock_bh(&mpath
->state_lock
);
385 if (mpath
->flags
& MESH_PATH_FIXED
)
387 else if ((mpath
->flags
& MESH_PATH_ACTIVE
) &&
388 (mpath
->flags
& MESH_PATH_SN_VALID
)) {
389 if (SN_GT(mpath
->sn
, orig_sn
) ||
390 (mpath
->sn
== orig_sn
&&
391 action
== MPATH_PREQ
&&
392 new_metric
> mpath
->metric
)) {
398 mesh_path_add(orig_addr
, sdata
);
399 mpath
= mesh_path_lookup(orig_addr
, sdata
);
404 spin_lock_bh(&mpath
->state_lock
);
408 mesh_path_assign_nexthop(mpath
, sta
);
409 mpath
->flags
|= MESH_PATH_SN_VALID
;
410 mpath
->metric
= new_metric
;
412 mpath
->exp_time
= time_after(mpath
->exp_time
, exp_time
)
413 ? mpath
->exp_time
: exp_time
;
414 mesh_path_activate(mpath
);
415 spin_unlock_bh(&mpath
->state_lock
);
416 mesh_path_tx_pending(mpath
);
417 /* draft says preq_id should be saved to, but there does
418 * not seem to be any use for it, skipping by now
421 spin_unlock_bh(&mpath
->state_lock
);
424 /* Update and check transmitter routing info */
426 if (memcmp(orig_addr
, ta
, ETH_ALEN
) == 0)
431 mpath
= mesh_path_lookup(ta
, sdata
);
433 spin_lock_bh(&mpath
->state_lock
);
434 if ((mpath
->flags
& MESH_PATH_FIXED
) ||
435 ((mpath
->flags
& MESH_PATH_ACTIVE
) &&
436 (last_hop_metric
> mpath
->metric
)))
439 mesh_path_add(ta
, sdata
);
440 mpath
= mesh_path_lookup(ta
, sdata
);
445 spin_lock_bh(&mpath
->state_lock
);
449 mesh_path_assign_nexthop(mpath
, sta
);
450 mpath
->flags
&= ~MESH_PATH_SN_VALID
;
451 mpath
->metric
= last_hop_metric
;
452 mpath
->exp_time
= time_after(mpath
->exp_time
, exp_time
)
453 ? mpath
->exp_time
: exp_time
;
454 mesh_path_activate(mpath
);
455 spin_unlock_bh(&mpath
->state_lock
);
456 mesh_path_tx_pending(mpath
);
458 spin_unlock_bh(&mpath
->state_lock
);
463 return process
? new_metric
: 0;
466 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data
*sdata
,
467 struct ieee80211_mgmt
*mgmt
,
468 u8
*preq_elem
, u32 metric
)
470 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
471 struct mesh_path
*mpath
;
472 u8
*target_addr
, *orig_addr
;
473 u8 target_flags
, ttl
;
474 u32 orig_sn
, target_sn
, lifetime
;
478 /* Update target SN, if present */
479 target_addr
= PREQ_IE_TARGET_ADDR(preq_elem
);
480 orig_addr
= PREQ_IE_ORIG_ADDR(preq_elem
);
481 target_sn
= PREQ_IE_TARGET_SN(preq_elem
);
482 orig_sn
= PREQ_IE_ORIG_SN(preq_elem
);
483 target_flags
= PREQ_IE_TARGET_F(preq_elem
);
485 mhwmp_dbg("received PREQ from %pM\n", orig_addr
);
487 if (memcmp(target_addr
, sdata
->dev
->dev_addr
, ETH_ALEN
) == 0) {
488 mhwmp_dbg("PREQ is for us\n");
492 if (time_after(jiffies
, ifmsh
->last_sn_update
+
493 net_traversal_jiffies(sdata
)) ||
494 time_before(jiffies
, ifmsh
->last_sn_update
)) {
495 target_sn
= ++ifmsh
->sn
;
496 ifmsh
->last_sn_update
= jiffies
;
500 mpath
= mesh_path_lookup(target_addr
, sdata
);
502 if ((!(mpath
->flags
& MESH_PATH_SN_VALID
)) ||
503 SN_LT(mpath
->sn
, target_sn
)) {
504 mpath
->sn
= target_sn
;
505 mpath
->flags
|= MESH_PATH_SN_VALID
;
506 } else if ((!(target_flags
& MP_F_DO
)) &&
507 (mpath
->flags
& MESH_PATH_ACTIVE
)) {
509 metric
= mpath
->metric
;
510 target_sn
= mpath
->sn
;
511 if (target_flags
& MP_F_RF
)
512 target_flags
|= MP_F_DO
;
521 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
522 ttl
= ifmsh
->mshcfg
.dot11MeshTTL
;
524 mhwmp_dbg("replying to the PREQ\n");
525 mesh_path_sel_frame_tx(MPATH_PREP
, 0, target_addr
,
526 cpu_to_le32(target_sn
), 0, orig_addr
,
527 cpu_to_le32(orig_sn
), mgmt
->sa
, 0, ttl
,
528 cpu_to_le32(lifetime
), cpu_to_le32(metric
),
531 ifmsh
->mshstats
.dropped_frames_ttl
++;
538 ttl
= PREQ_IE_TTL(preq_elem
);
539 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
541 ifmsh
->mshstats
.dropped_frames_ttl
++;
544 mhwmp_dbg("forwarding the PREQ from %pM\n", orig_addr
);
546 flags
= PREQ_IE_FLAGS(preq_elem
);
547 preq_id
= PREQ_IE_PREQ_ID(preq_elem
);
548 hopcount
= PREQ_IE_HOPCOUNT(preq_elem
) + 1;
549 mesh_path_sel_frame_tx(MPATH_PREQ
, flags
, orig_addr
,
550 cpu_to_le32(orig_sn
), target_flags
, target_addr
,
551 cpu_to_le32(target_sn
), sdata
->dev
->broadcast
,
552 hopcount
, ttl
, cpu_to_le32(lifetime
),
553 cpu_to_le32(metric
), cpu_to_le32(preq_id
),
555 ifmsh
->mshstats
.fwded_mcast
++;
556 ifmsh
->mshstats
.fwded_frames
++;
561 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data
*sdata
,
562 struct ieee80211_mgmt
*mgmt
,
563 u8
*prep_elem
, u32 metric
)
565 struct mesh_path
*mpath
;
566 u8
*target_addr
, *orig_addr
;
567 u8 ttl
, hopcount
, flags
;
568 u8 next_hop
[ETH_ALEN
];
569 u32 target_sn
, orig_sn
, lifetime
;
571 mhwmp_dbg("received PREP from %pM\n", PREP_IE_ORIG_ADDR(prep_elem
));
573 /* Note that we divert from the draft nomenclature and denominate
574 * destination to what the draft refers to as origininator. So in this
575 * function destnation refers to the final destination of the PREP,
576 * which corresponds with the originator of the PREQ which this PREP
579 target_addr
= PREP_IE_TARGET_ADDR(prep_elem
);
580 if (memcmp(target_addr
, sdata
->dev
->dev_addr
, ETH_ALEN
) == 0)
581 /* destination, no forwarding required */
584 ttl
= PREP_IE_TTL(prep_elem
);
586 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
591 mpath
= mesh_path_lookup(target_addr
, sdata
);
593 spin_lock_bh(&mpath
->state_lock
);
596 if (!(mpath
->flags
& MESH_PATH_ACTIVE
)) {
597 spin_unlock_bh(&mpath
->state_lock
);
600 memcpy(next_hop
, mpath
->next_hop
->sta
.addr
, ETH_ALEN
);
601 spin_unlock_bh(&mpath
->state_lock
);
603 flags
= PREP_IE_FLAGS(prep_elem
);
604 lifetime
= PREP_IE_LIFETIME(prep_elem
);
605 hopcount
= PREP_IE_HOPCOUNT(prep_elem
) + 1;
606 orig_addr
= PREP_IE_ORIG_ADDR(prep_elem
);
607 target_sn
= PREP_IE_TARGET_SN(prep_elem
);
608 orig_sn
= PREP_IE_ORIG_SN(prep_elem
);
610 mesh_path_sel_frame_tx(MPATH_PREP
, flags
, orig_addr
,
611 cpu_to_le32(orig_sn
), 0, target_addr
,
612 cpu_to_le32(target_sn
), mpath
->next_hop
->sta
.addr
, hopcount
,
613 ttl
, cpu_to_le32(lifetime
), cpu_to_le32(metric
),
617 sdata
->u
.mesh
.mshstats
.fwded_unicast
++;
618 sdata
->u
.mesh
.mshstats
.fwded_frames
++;
623 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
627 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data
*sdata
,
628 struct ieee80211_mgmt
*mgmt
, u8
*perr_elem
)
630 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
631 struct mesh_path
*mpath
;
633 u8
*ta
, *target_addr
;
639 ttl
= PERR_IE_TTL(perr_elem
);
641 ifmsh
->mshstats
.dropped_frames_ttl
++;
645 target_flags
= PERR_IE_TARGET_FLAGS(perr_elem
);
646 target_addr
= PERR_IE_TARGET_ADDR(perr_elem
);
647 target_sn
= PERR_IE_TARGET_SN(perr_elem
);
648 target_rcode
= PERR_IE_TARGET_RCODE(perr_elem
);
651 mpath
= mesh_path_lookup(target_addr
, sdata
);
653 spin_lock_bh(&mpath
->state_lock
);
654 if (mpath
->flags
& MESH_PATH_ACTIVE
&&
655 memcmp(ta
, mpath
->next_hop
->sta
.addr
, ETH_ALEN
) == 0 &&
656 (!(mpath
->flags
& MESH_PATH_SN_VALID
) ||
657 SN_GT(target_sn
, mpath
->sn
))) {
658 mpath
->flags
&= ~MESH_PATH_ACTIVE
;
659 mpath
->sn
= target_sn
;
660 spin_unlock_bh(&mpath
->state_lock
);
661 mesh_path_error_tx(ttl
, target_addr
, cpu_to_le32(target_sn
),
662 cpu_to_le16(target_rcode
),
663 sdata
->dev
->broadcast
, sdata
);
665 spin_unlock_bh(&mpath
->state_lock
);
670 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data
*sdata
,
671 struct ieee80211_mgmt
*mgmt
,
672 struct ieee80211_rann_ie
*rann
)
674 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
675 struct mesh_path
*mpath
;
677 u8 ttl
, flags
, hopcount
;
682 ttl
= rann
->rann_ttl
;
684 ifmsh
->mshstats
.dropped_frames_ttl
++;
688 flags
= rann
->rann_flags
;
689 orig_addr
= rann
->rann_addr
;
690 orig_sn
= rann
->rann_seq
;
691 hopcount
= rann
->rann_hopcount
;
693 metric
= rann
->rann_metric
;
694 mhwmp_dbg("received RANN from %pM\n", orig_addr
);
697 mpath
= mesh_path_lookup(orig_addr
, sdata
);
699 mesh_path_add(orig_addr
, sdata
);
700 mpath
= mesh_path_lookup(orig_addr
, sdata
);
703 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
706 mesh_queue_preq(mpath
,
707 PREQ_Q_F_START
| PREQ_Q_F_REFRESH
);
709 if (mpath
->sn
< orig_sn
) {
710 mesh_path_sel_frame_tx(MPATH_RANN
, flags
, orig_addr
,
711 cpu_to_le32(orig_sn
),
712 0, NULL
, 0, sdata
->dev
->broadcast
,
714 cpu_to_le32(metric
+ mpath
->metric
),
722 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data
*sdata
,
723 struct ieee80211_mgmt
*mgmt
,
726 struct ieee802_11_elems elems
;
730 /* need action_code */
731 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
734 baselen
= (u8
*) mgmt
->u
.action
.u
.mesh_action
.variable
- (u8
*) mgmt
;
735 ieee802_11_parse_elems(mgmt
->u
.action
.u
.mesh_action
.variable
,
736 len
- baselen
, &elems
);
739 if (elems
.preq_len
!= 37)
740 /* Right now we support just 1 destination and no AE */
742 last_hop_metric
= hwmp_route_info_get(sdata
, mgmt
, elems
.preq
,
745 hwmp_preq_frame_process(sdata
, mgmt
, elems
.preq
,
749 if (elems
.prep_len
!= 31)
750 /* Right now we support no AE */
752 last_hop_metric
= hwmp_route_info_get(sdata
, mgmt
, elems
.prep
,
755 hwmp_prep_frame_process(sdata
, mgmt
, elems
.prep
,
759 if (elems
.perr_len
!= 15)
760 /* Right now we support only one destination per PERR */
762 hwmp_perr_frame_process(sdata
, mgmt
, elems
.perr
);
765 hwmp_rann_frame_process(sdata
, mgmt
, elems
.rann
);
769 * mesh_queue_preq - queue a PREQ to a given destination
771 * @mpath: mesh path to discover
772 * @flags: special attributes of the PREQ to be sent
774 * Locking: the function must be called from within a rcu read lock block.
777 static void mesh_queue_preq(struct mesh_path
*mpath
, u8 flags
)
779 struct ieee80211_sub_if_data
*sdata
= mpath
->sdata
;
780 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
781 struct mesh_preq_queue
*preq_node
;
783 preq_node
= kmalloc(sizeof(struct mesh_preq_queue
), GFP_ATOMIC
);
785 mhwmp_dbg("could not allocate PREQ node\n");
789 spin_lock(&ifmsh
->mesh_preq_queue_lock
);
790 if (ifmsh
->preq_queue_len
== MAX_PREQ_QUEUE_LEN
) {
791 spin_unlock(&ifmsh
->mesh_preq_queue_lock
);
793 if (printk_ratelimit())
794 mhwmp_dbg("PREQ node queue full\n");
798 memcpy(preq_node
->dst
, mpath
->dst
, ETH_ALEN
);
799 preq_node
->flags
= flags
;
801 list_add_tail(&preq_node
->list
, &ifmsh
->preq_queue
.list
);
802 ++ifmsh
->preq_queue_len
;
803 spin_unlock(&ifmsh
->mesh_preq_queue_lock
);
805 if (time_after(jiffies
, ifmsh
->last_preq
+ min_preq_int_jiff(sdata
)))
806 ieee80211_queue_work(&sdata
->local
->hw
, &ifmsh
->work
);
808 else if (time_before(jiffies
, ifmsh
->last_preq
)) {
809 /* avoid long wait if did not send preqs for a long time
810 * and jiffies wrapped around
812 ifmsh
->last_preq
= jiffies
- min_preq_int_jiff(sdata
) - 1;
813 ieee80211_queue_work(&sdata
->local
->hw
, &ifmsh
->work
);
815 mod_timer(&ifmsh
->mesh_path_timer
, ifmsh
->last_preq
+
816 min_preq_int_jiff(sdata
));
820 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
822 * @sdata: local mesh subif
824 void mesh_path_start_discovery(struct ieee80211_sub_if_data
*sdata
)
826 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
827 struct mesh_preq_queue
*preq_node
;
828 struct mesh_path
*mpath
;
829 u8 ttl
, target_flags
;
832 spin_lock_bh(&ifmsh
->mesh_preq_queue_lock
);
833 if (!ifmsh
->preq_queue_len
||
834 time_before(jiffies
, ifmsh
->last_preq
+
835 min_preq_int_jiff(sdata
))) {
836 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
840 preq_node
= list_first_entry(&ifmsh
->preq_queue
.list
,
841 struct mesh_preq_queue
, list
);
842 list_del(&preq_node
->list
);
843 --ifmsh
->preq_queue_len
;
844 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
847 mpath
= mesh_path_lookup(preq_node
->dst
, sdata
);
851 spin_lock_bh(&mpath
->state_lock
);
852 if (preq_node
->flags
& PREQ_Q_F_START
) {
853 if (mpath
->flags
& MESH_PATH_RESOLVING
) {
854 spin_unlock_bh(&mpath
->state_lock
);
857 mpath
->flags
&= ~MESH_PATH_RESOLVED
;
858 mpath
->flags
|= MESH_PATH_RESOLVING
;
859 mpath
->discovery_retries
= 0;
860 mpath
->discovery_timeout
= disc_timeout_jiff(sdata
);
862 } else if (!(mpath
->flags
& MESH_PATH_RESOLVING
) ||
863 mpath
->flags
& MESH_PATH_RESOLVED
) {
864 mpath
->flags
&= ~MESH_PATH_RESOLVING
;
865 spin_unlock_bh(&mpath
->state_lock
);
869 ifmsh
->last_preq
= jiffies
;
871 if (time_after(jiffies
, ifmsh
->last_sn_update
+
872 net_traversal_jiffies(sdata
)) ||
873 time_before(jiffies
, ifmsh
->last_sn_update
)) {
875 sdata
->u
.mesh
.last_sn_update
= jiffies
;
877 lifetime
= default_lifetime(sdata
);
878 ttl
= sdata
->u
.mesh
.mshcfg
.dot11MeshTTL
;
880 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
881 spin_unlock_bh(&mpath
->state_lock
);
885 if (preq_node
->flags
& PREQ_Q_F_REFRESH
)
886 target_flags
= MP_F_DO
;
888 target_flags
= MP_F_RF
;
890 spin_unlock_bh(&mpath
->state_lock
);
891 mesh_path_sel_frame_tx(MPATH_PREQ
, 0, sdata
->dev
->dev_addr
,
892 cpu_to_le32(ifmsh
->sn
), target_flags
, mpath
->dst
,
893 cpu_to_le32(mpath
->sn
), sdata
->dev
->broadcast
, 0,
894 ttl
, cpu_to_le32(lifetime
), 0,
895 cpu_to_le32(ifmsh
->preq_id
++), sdata
);
896 mod_timer(&mpath
->timer
, jiffies
+ mpath
->discovery_timeout
);
904 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame
906 * @skb: 802.11 frame to be sent
907 * @sdata: network subif the frame will be sent through
909 * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is
910 * found, the function will start a path discovery and queue the frame so it is
911 * sent when the path is resolved. This means the caller must not free the skb
914 int mesh_nexthop_lookup(struct sk_buff
*skb
,
915 struct ieee80211_sub_if_data
*sdata
)
917 struct sk_buff
*skb_to_free
= NULL
;
918 struct mesh_path
*mpath
;
919 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
920 u8
*target_addr
= hdr
->addr3
;
924 mpath
= mesh_path_lookup(target_addr
, sdata
);
927 mesh_path_add(target_addr
, sdata
);
928 mpath
= mesh_path_lookup(target_addr
, sdata
);
930 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
936 if (mpath
->flags
& MESH_PATH_ACTIVE
) {
937 if (time_after(jiffies
, mpath
->exp_time
+
938 msecs_to_jiffies(sdata
->u
.mesh
.mshcfg
.path_refresh_time
))
939 && !memcmp(sdata
->dev
->dev_addr
, hdr
->addr4
,
941 && !(mpath
->flags
& MESH_PATH_RESOLVING
)
942 && !(mpath
->flags
& MESH_PATH_FIXED
)) {
943 mesh_queue_preq(mpath
,
944 PREQ_Q_F_START
| PREQ_Q_F_REFRESH
);
946 memcpy(hdr
->addr1
, mpath
->next_hop
->sta
.addr
,
949 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
950 if (!(mpath
->flags
& MESH_PATH_RESOLVING
)) {
951 /* Start discovery only if it is not running yet */
952 mesh_queue_preq(mpath
, PREQ_Q_F_START
);
955 if (skb_queue_len(&mpath
->frame_queue
) >=
956 MESH_FRAME_QUEUE_LEN
)
957 skb_to_free
= skb_dequeue(&mpath
->frame_queue
);
959 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
960 skb_queue_tail(&mpath
->frame_queue
, skb
);
962 mesh_path_discard_frame(skb_to_free
, sdata
);
971 void mesh_path_timer(unsigned long data
)
973 struct ieee80211_sub_if_data
*sdata
;
974 struct mesh_path
*mpath
;
977 mpath
= (struct mesh_path
*) data
;
978 mpath
= rcu_dereference(mpath
);
981 sdata
= mpath
->sdata
;
983 if (sdata
->local
->quiescing
) {
988 spin_lock_bh(&mpath
->state_lock
);
989 if (mpath
->flags
& MESH_PATH_RESOLVED
||
990 (!(mpath
->flags
& MESH_PATH_RESOLVING
)))
991 mpath
->flags
&= ~(MESH_PATH_RESOLVING
| MESH_PATH_RESOLVED
);
992 else if (mpath
->discovery_retries
< max_preq_retries(sdata
)) {
993 ++mpath
->discovery_retries
;
994 mpath
->discovery_timeout
*= 2;
995 mesh_queue_preq(mpath
, 0);
998 mpath
->exp_time
= jiffies
;
999 mesh_path_flush_pending(mpath
);
1002 spin_unlock_bh(&mpath
->state_lock
);
1008 mesh_path_tx_root_frame(struct ieee80211_sub_if_data
*sdata
)
1010 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
1012 mesh_path_sel_frame_tx(MPATH_RANN
, 0, sdata
->dev
->dev_addr
,
1013 cpu_to_le32(++ifmsh
->sn
),
1014 0, NULL
, 0, sdata
->dev
->broadcast
,
1015 0, MESH_TTL
, 0, 0, 0, sdata
);