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>
11 #include <linux/etherdevice.h>
12 #include <asm/unaligned.h>
16 #define TEST_FRAME_LEN 8192
17 #define MAX_METRIC 0xffffffff
20 #define MAX_PREQ_QUEUE_LEN 64
22 static void mesh_queue_preq(struct mesh_path
*, u8
);
24 static inline u32
u32_field_get(const u8
*preq_elem
, int offset
, bool ae
)
28 return get_unaligned_le32(preq_elem
+ offset
);
31 static inline u16
u16_field_get(const u8
*preq_elem
, int offset
, bool ae
)
35 return get_unaligned_le16(preq_elem
+ offset
);
38 /* HWMP IE processing macros */
40 #define AE_F_SET(x) (*x & AE_F)
41 #define PREQ_IE_FLAGS(x) (*(x))
42 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
43 #define PREQ_IE_TTL(x) (*(x + 2))
44 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
45 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
46 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0)
47 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x))
48 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x))
49 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
50 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
51 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x))
54 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
55 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
56 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
57 #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
58 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x))
59 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x))
60 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x))
61 #define PREP_IE_TARGET_ADDR(x) (x + 3)
62 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
64 #define PERR_IE_TTL(x) (*(x))
65 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
66 #define PERR_IE_TARGET_ADDR(x) (x + 3)
67 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
68 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0)
70 #define MSEC_TO_TU(x) (x*1000/1024)
71 #define SN_GT(x, y) ((s32)(y - x) < 0)
72 #define SN_LT(x, y) ((s32)(x - y) < 0)
73 #define MAX_SANE_SN_DELTA 32
75 static inline u32
SN_DELTA(u32 x
, u32 y
)
77 return x
>= y
? x
- y
: y
- x
;
80 #define net_traversal_jiffies(s) \
81 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
82 #define default_lifetime(s) \
83 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
84 #define min_preq_int_jiff(s) \
85 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
86 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
87 #define disc_timeout_jiff(s) \
88 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
89 #define root_path_confirmation_jiffies(s) \
90 msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval)
92 enum mpath_frame_type
{
99 static const u8 broadcast_addr
[ETH_ALEN
] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
101 static int mesh_path_sel_frame_tx(enum mpath_frame_type action
, u8 flags
,
102 const u8
*orig_addr
, u32 orig_sn
,
103 u8 target_flags
, const u8
*target
,
104 u32 target_sn
, const u8
*da
,
105 u8 hop_count
, u8 ttl
,
106 u32 lifetime
, u32 metric
, u32 preq_id
,
107 struct ieee80211_sub_if_data
*sdata
)
109 struct ieee80211_local
*local
= sdata
->local
;
111 struct ieee80211_mgmt
*mgmt
;
113 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.action
.u
.mesh_action
) +
114 sizeof(mgmt
->u
.action
.u
.mesh_action
);
116 skb
= dev_alloc_skb(local
->tx_headroom
+
118 2 + 37); /* max HWMP IE */
121 skb_reserve(skb
, local
->tx_headroom
);
122 mgmt
= (struct ieee80211_mgmt
*) skb_put(skb
, hdr_len
);
123 memset(mgmt
, 0, hdr_len
);
124 mgmt
->frame_control
= cpu_to_le16(IEEE80211_FTYPE_MGMT
|
125 IEEE80211_STYPE_ACTION
);
127 memcpy(mgmt
->da
, da
, ETH_ALEN
);
128 memcpy(mgmt
->sa
, sdata
->vif
.addr
, ETH_ALEN
);
130 memcpy(mgmt
->bssid
, sdata
->vif
.addr
, ETH_ALEN
);
131 mgmt
->u
.action
.category
= WLAN_CATEGORY_MESH_ACTION
;
132 mgmt
->u
.action
.u
.mesh_action
.action_code
=
133 WLAN_MESH_ACTION_HWMP_PATH_SELECTION
;
137 mhwmp_dbg(sdata
, "sending PREQ to %pM\n", target
);
139 pos
= skb_put(skb
, 2 + ie_len
);
140 *pos
++ = WLAN_EID_PREQ
;
143 mhwmp_dbg(sdata
, "sending PREP to %pM\n", orig_addr
);
145 pos
= skb_put(skb
, 2 + ie_len
);
146 *pos
++ = WLAN_EID_PREP
;
149 mhwmp_dbg(sdata
, "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
;
162 if (action
== MPATH_PREP
) {
163 memcpy(pos
, target
, ETH_ALEN
);
165 put_unaligned_le32(target_sn
, pos
);
168 if (action
== MPATH_PREQ
) {
169 put_unaligned_le32(preq_id
, pos
);
172 memcpy(pos
, orig_addr
, ETH_ALEN
);
174 put_unaligned_le32(orig_sn
, pos
);
177 put_unaligned_le32(lifetime
, pos
); /* interval for RANN */
179 put_unaligned_le32(metric
, pos
);
181 if (action
== MPATH_PREQ
) {
182 *pos
++ = 1; /* destination count */
183 *pos
++ = target_flags
;
184 memcpy(pos
, target
, ETH_ALEN
);
186 put_unaligned_le32(target_sn
, pos
);
188 } else if (action
== MPATH_PREP
) {
189 memcpy(pos
, orig_addr
, ETH_ALEN
);
191 put_unaligned_le32(orig_sn
, pos
);
195 ieee80211_tx_skb(sdata
, skb
);
200 /* Headroom is not adjusted. Caller should ensure that skb has sufficient
201 * headroom in case the frame is encrypted. */
202 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data
*sdata
,
205 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
206 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
208 skb_reset_mac_header(skb
);
209 skb_reset_network_header(skb
);
210 skb_reset_transport_header(skb
);
212 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
213 skb_set_queue_mapping(skb
, IEEE80211_AC_VO
);
216 info
->control
.vif
= &sdata
->vif
;
217 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
218 ieee80211_set_qos_hdr(sdata
, skb
);
219 ieee80211_mps_set_frame_flags(sdata
, NULL
, hdr
);
223 * mesh_path_error_tx - Sends a PERR mesh management frame
225 * @ttl: allowed remaining hops
226 * @target: broken destination
227 * @target_sn: SN of the broken destination
228 * @target_rcode: reason code for this PERR
229 * @ra: node this frame is addressed to
230 * @sdata: local mesh subif
232 * Note: This function may be called with driver locks taken that the driver
233 * also acquires in the TX path. To avoid a deadlock we don't transmit the
234 * frame directly but add it to the pending queue instead.
236 int mesh_path_error_tx(struct ieee80211_sub_if_data
*sdata
,
237 u8 ttl
, const u8
*target
, u32 target_sn
,
238 u16 target_rcode
, const u8
*ra
)
240 struct ieee80211_local
*local
= sdata
->local
;
242 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
243 struct ieee80211_mgmt
*mgmt
;
245 int hdr_len
= offsetof(struct ieee80211_mgmt
, u
.action
.u
.mesh_action
) +
246 sizeof(mgmt
->u
.action
.u
.mesh_action
);
248 if (time_before(jiffies
, ifmsh
->next_perr
))
251 skb
= dev_alloc_skb(local
->tx_headroom
+
252 sdata
->encrypt_headroom
+
253 IEEE80211_ENCRYPT_TAILROOM
+
255 2 + 15 /* PERR IE */);
258 skb_reserve(skb
, local
->tx_headroom
+ sdata
->encrypt_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 */
279 /* Flags field has AE bit only as defined in
280 * sec 8.4.2.117 IEEE802.11-2012
284 memcpy(pos
, target
, ETH_ALEN
);
286 put_unaligned_le32(target_sn
, pos
);
288 put_unaligned_le16(target_rcode
, pos
);
290 /* see note in function header */
291 prepare_frame_for_deferred_tx(sdata
, skb
);
292 ifmsh
->next_perr
= TU_TO_EXP_TIME(
293 ifmsh
->mshcfg
.dot11MeshHWMPperrMinInterval
);
294 ieee80211_add_pending_skb(local
, skb
);
298 void ieee80211s_update_metric(struct ieee80211_local
*local
,
299 struct sta_info
*sta
, struct sk_buff
*skb
)
301 struct ieee80211_tx_info
*txinfo
= IEEE80211_SKB_CB(skb
);
302 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
305 if (!ieee80211_is_data(hdr
->frame_control
))
308 failed
= !(txinfo
->flags
& IEEE80211_TX_STAT_ACK
);
310 /* moving average, scaled to 100 */
311 sta
->mesh
->fail_avg
=
312 ((80 * sta
->mesh
->fail_avg
+ 5) / 100 + 20 * failed
);
313 if (sta
->mesh
->fail_avg
> 95)
314 mesh_plink_broken(sta
);
317 static u32
airtime_link_metric_get(struct ieee80211_local
*local
,
318 struct sta_info
*sta
)
320 struct rate_info rinfo
;
321 /* This should be adjusted for each device */
322 int device_constant
= 1 << ARITH_SHIFT
;
323 int test_frame_len
= TEST_FRAME_LEN
<< ARITH_SHIFT
;
324 int s_unit
= 1 << ARITH_SHIFT
;
326 u32 tx_time
, estimated_retx
;
329 /* Try to get rate based on HW/SW RC algorithm.
330 * Rate is returned in units of Kbps, correct this
331 * to comply with airtime calculation units
332 * Round up in case we get rate < 100Kbps
334 rate
= DIV_ROUND_UP(sta_get_expected_throughput(sta
), 100);
339 if (sta
->mesh
->fail_avg
>= 100)
342 sta_set_rate_info_tx(sta
, &sta
->tx_stats
.last_rate
, &rinfo
);
343 rate
= cfg80211_calculate_bitrate(&rinfo
);
347 err
= (sta
->mesh
->fail_avg
<< ARITH_SHIFT
) / 100;
350 /* bitrate is in units of 100 Kbps, while we need rate in units of
351 * 1Mbps. This will be corrected on tx_time computation.
353 tx_time
= (device_constant
+ 10 * test_frame_len
/ rate
);
354 estimated_retx
= ((1 << (2 * ARITH_SHIFT
)) / (s_unit
- err
));
355 result
= (tx_time
* estimated_retx
) >> (2 * ARITH_SHIFT
);
360 * hwmp_route_info_get - Update routing info to originator and transmitter
362 * @sdata: local mesh subif
363 * @mgmt: mesh management frame
364 * @hwmp_ie: hwmp information element (PREP or PREQ)
365 * @action: type of hwmp ie
367 * This function updates the path routing information to the originator and the
368 * transmitter of a HWMP PREQ or PREP frame.
370 * Returns: metric to frame originator or 0 if the frame should not be further
373 * Notes: this function is the only place (besides user-provided info) where
374 * path routing information is updated.
376 static u32
hwmp_route_info_get(struct ieee80211_sub_if_data
*sdata
,
377 struct ieee80211_mgmt
*mgmt
,
378 const u8
*hwmp_ie
, enum mpath_frame_type action
)
380 struct ieee80211_local
*local
= sdata
->local
;
381 struct mesh_path
*mpath
;
382 struct sta_info
*sta
;
384 const u8
*orig_addr
, *ta
;
385 u32 orig_sn
, orig_metric
;
386 unsigned long orig_lifetime
, exp_time
;
387 u32 last_hop_metric
, new_metric
;
391 sta
= sta_info_get(sdata
, mgmt
->sa
);
397 last_hop_metric
= airtime_link_metric_get(local
, sta
);
398 /* Update and check originator routing info */
403 orig_addr
= PREQ_IE_ORIG_ADDR(hwmp_ie
);
404 orig_sn
= PREQ_IE_ORIG_SN(hwmp_ie
);
405 orig_lifetime
= PREQ_IE_LIFETIME(hwmp_ie
);
406 orig_metric
= PREQ_IE_METRIC(hwmp_ie
);
409 /* Originator here refers to the MP that was the target in the
410 * Path Request. We divert from the nomenclature in the draft
411 * so that we can easily use a single function to gather path
412 * information from both PREQ and PREP frames.
414 orig_addr
= PREP_IE_TARGET_ADDR(hwmp_ie
);
415 orig_sn
= PREP_IE_TARGET_SN(hwmp_ie
);
416 orig_lifetime
= PREP_IE_LIFETIME(hwmp_ie
);
417 orig_metric
= PREP_IE_METRIC(hwmp_ie
);
423 new_metric
= orig_metric
+ last_hop_metric
;
424 if (new_metric
< orig_metric
)
425 new_metric
= MAX_METRIC
;
426 exp_time
= TU_TO_EXP_TIME(orig_lifetime
);
428 if (ether_addr_equal(orig_addr
, sdata
->vif
.addr
)) {
429 /* This MP is the originator, we are not interested in this
430 * frame, except for updating transmitter's path info.
435 mpath
= mesh_path_lookup(sdata
, orig_addr
);
437 spin_lock_bh(&mpath
->state_lock
);
438 if (mpath
->flags
& MESH_PATH_FIXED
)
440 else if ((mpath
->flags
& MESH_PATH_ACTIVE
) &&
441 (mpath
->flags
& MESH_PATH_SN_VALID
)) {
442 if (SN_GT(mpath
->sn
, orig_sn
) ||
443 (mpath
->sn
== orig_sn
&&
444 new_metric
>= mpath
->metric
)) {
448 } else if (!(mpath
->flags
& MESH_PATH_ACTIVE
)) {
449 bool have_sn
, newer_sn
, bounced
;
451 have_sn
= mpath
->flags
& MESH_PATH_SN_VALID
;
452 newer_sn
= have_sn
&& SN_GT(orig_sn
, mpath
->sn
);
454 (SN_DELTA(orig_sn
, mpath
->sn
) >
457 if (!have_sn
|| newer_sn
) {
458 /* if SN is newer than what we had
459 * then we can take it */;
460 } else if (bounced
) {
461 /* if SN is way different than what
462 * we had then assume the other side
463 * rebooted or restarted */;
470 mpath
= mesh_path_add(sdata
, orig_addr
);
475 spin_lock_bh(&mpath
->state_lock
);
479 mesh_path_assign_nexthop(mpath
, sta
);
480 mpath
->flags
|= MESH_PATH_SN_VALID
;
481 mpath
->metric
= new_metric
;
483 mpath
->exp_time
= time_after(mpath
->exp_time
, exp_time
)
484 ? mpath
->exp_time
: exp_time
;
485 mesh_path_activate(mpath
);
486 spin_unlock_bh(&mpath
->state_lock
);
487 mesh_path_tx_pending(mpath
);
488 /* draft says preq_id should be saved to, but there does
489 * not seem to be any use for it, skipping by now
492 spin_unlock_bh(&mpath
->state_lock
);
495 /* Update and check transmitter routing info */
497 if (ether_addr_equal(orig_addr
, ta
))
502 mpath
= mesh_path_lookup(sdata
, ta
);
504 spin_lock_bh(&mpath
->state_lock
);
505 if ((mpath
->flags
& MESH_PATH_FIXED
) ||
506 ((mpath
->flags
& MESH_PATH_ACTIVE
) &&
507 (last_hop_metric
> mpath
->metric
)))
510 mpath
= mesh_path_add(sdata
, ta
);
515 spin_lock_bh(&mpath
->state_lock
);
519 mesh_path_assign_nexthop(mpath
, sta
);
520 mpath
->metric
= last_hop_metric
;
521 mpath
->exp_time
= time_after(mpath
->exp_time
, exp_time
)
522 ? mpath
->exp_time
: exp_time
;
523 mesh_path_activate(mpath
);
524 spin_unlock_bh(&mpath
->state_lock
);
525 mesh_path_tx_pending(mpath
);
527 spin_unlock_bh(&mpath
->state_lock
);
532 return process
? new_metric
: 0;
535 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data
*sdata
,
536 struct ieee80211_mgmt
*mgmt
,
537 const u8
*preq_elem
, u32 orig_metric
)
539 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
540 struct mesh_path
*mpath
= NULL
;
541 const u8
*target_addr
, *orig_addr
;
543 u8 target_flags
, ttl
, flags
;
544 u32 orig_sn
, target_sn
, lifetime
, target_metric
= 0;
549 /* Update target SN, if present */
550 target_addr
= PREQ_IE_TARGET_ADDR(preq_elem
);
551 orig_addr
= PREQ_IE_ORIG_ADDR(preq_elem
);
552 target_sn
= PREQ_IE_TARGET_SN(preq_elem
);
553 orig_sn
= PREQ_IE_ORIG_SN(preq_elem
);
554 target_flags
= PREQ_IE_TARGET_F(preq_elem
);
555 /* Proactive PREQ gate announcements */
556 flags
= PREQ_IE_FLAGS(preq_elem
);
557 root_is_gate
= !!(flags
& RANN_FLAG_IS_GATE
);
559 mhwmp_dbg(sdata
, "received PREQ from %pM\n", orig_addr
);
561 if (ether_addr_equal(target_addr
, sdata
->vif
.addr
)) {
562 mhwmp_dbg(sdata
, "PREQ is for us\n");
566 if (time_after(jiffies
, ifmsh
->last_sn_update
+
567 net_traversal_jiffies(sdata
)) ||
568 time_before(jiffies
, ifmsh
->last_sn_update
)) {
570 ifmsh
->last_sn_update
= jiffies
;
572 target_sn
= ifmsh
->sn
;
573 } else if (is_broadcast_ether_addr(target_addr
) &&
574 (target_flags
& IEEE80211_PREQ_TO_FLAG
)) {
576 mpath
= mesh_path_lookup(sdata
, orig_addr
);
578 if (flags
& IEEE80211_PREQ_PROACTIVE_PREP_FLAG
) {
580 target_addr
= sdata
->vif
.addr
;
581 target_sn
= ++ifmsh
->sn
;
583 ifmsh
->last_sn_update
= jiffies
;
586 mesh_path_add_gate(mpath
);
591 mpath
= mesh_path_lookup(sdata
, target_addr
);
593 if ((!(mpath
->flags
& MESH_PATH_SN_VALID
)) ||
594 SN_LT(mpath
->sn
, target_sn
)) {
595 mpath
->sn
= target_sn
;
596 mpath
->flags
|= MESH_PATH_SN_VALID
;
597 } else if ((!(target_flags
& IEEE80211_PREQ_TO_FLAG
)) &&
598 (mpath
->flags
& MESH_PATH_ACTIVE
)) {
600 target_metric
= mpath
->metric
;
601 target_sn
= mpath
->sn
;
602 /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/
603 target_flags
|= IEEE80211_PREQ_TO_FLAG
;
610 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
611 ttl
= ifmsh
->mshcfg
.element_ttl
;
613 mhwmp_dbg(sdata
, "replying to the PREQ\n");
614 mesh_path_sel_frame_tx(MPATH_PREP
, 0, orig_addr
,
615 orig_sn
, 0, target_addr
,
616 target_sn
, mgmt
->sa
, 0, ttl
,
617 lifetime
, target_metric
, 0,
620 ifmsh
->mshstats
.dropped_frames_ttl
++;
624 if (forward
&& ifmsh
->mshcfg
.dot11MeshForwarding
) {
628 ttl
= PREQ_IE_TTL(preq_elem
);
629 lifetime
= PREQ_IE_LIFETIME(preq_elem
);
631 ifmsh
->mshstats
.dropped_frames_ttl
++;
634 mhwmp_dbg(sdata
, "forwarding the PREQ from %pM\n", orig_addr
);
636 preq_id
= PREQ_IE_PREQ_ID(preq_elem
);
637 hopcount
= PREQ_IE_HOPCOUNT(preq_elem
) + 1;
638 da
= (mpath
&& mpath
->is_root
) ?
639 mpath
->rann_snd_addr
: broadcast_addr
;
641 if (flags
& IEEE80211_PREQ_PROACTIVE_PREP_FLAG
) {
642 target_addr
= PREQ_IE_TARGET_ADDR(preq_elem
);
643 target_sn
= PREQ_IE_TARGET_SN(preq_elem
);
646 mesh_path_sel_frame_tx(MPATH_PREQ
, flags
, orig_addr
,
647 orig_sn
, target_flags
, target_addr
,
648 target_sn
, da
, hopcount
, ttl
, lifetime
,
649 orig_metric
, preq_id
, sdata
);
650 if (!is_multicast_ether_addr(da
))
651 ifmsh
->mshstats
.fwded_unicast
++;
653 ifmsh
->mshstats
.fwded_mcast
++;
654 ifmsh
->mshstats
.fwded_frames
++;
659 static inline struct sta_info
*
660 next_hop_deref_protected(struct mesh_path
*mpath
)
662 return rcu_dereference_protected(mpath
->next_hop
,
663 lockdep_is_held(&mpath
->state_lock
));
667 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data
*sdata
,
668 struct ieee80211_mgmt
*mgmt
,
669 const u8
*prep_elem
, u32 metric
)
671 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
672 struct mesh_path
*mpath
;
673 const u8
*target_addr
, *orig_addr
;
674 u8 ttl
, hopcount
, flags
;
675 u8 next_hop
[ETH_ALEN
];
676 u32 target_sn
, orig_sn
, lifetime
;
678 mhwmp_dbg(sdata
, "received PREP from %pM\n",
679 PREP_IE_TARGET_ADDR(prep_elem
));
681 orig_addr
= PREP_IE_ORIG_ADDR(prep_elem
);
682 if (ether_addr_equal(orig_addr
, sdata
->vif
.addr
))
683 /* destination, no forwarding required */
686 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
689 ttl
= PREP_IE_TTL(prep_elem
);
691 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
696 mpath
= mesh_path_lookup(sdata
, orig_addr
);
698 spin_lock_bh(&mpath
->state_lock
);
701 if (!(mpath
->flags
& MESH_PATH_ACTIVE
)) {
702 spin_unlock_bh(&mpath
->state_lock
);
705 memcpy(next_hop
, next_hop_deref_protected(mpath
)->sta
.addr
, ETH_ALEN
);
706 spin_unlock_bh(&mpath
->state_lock
);
708 flags
= PREP_IE_FLAGS(prep_elem
);
709 lifetime
= PREP_IE_LIFETIME(prep_elem
);
710 hopcount
= PREP_IE_HOPCOUNT(prep_elem
) + 1;
711 target_addr
= PREP_IE_TARGET_ADDR(prep_elem
);
712 target_sn
= PREP_IE_TARGET_SN(prep_elem
);
713 orig_sn
= PREP_IE_ORIG_SN(prep_elem
);
715 mesh_path_sel_frame_tx(MPATH_PREP
, flags
, orig_addr
, orig_sn
, 0,
716 target_addr
, target_sn
, next_hop
, hopcount
,
717 ttl
, lifetime
, metric
, 0, sdata
);
720 sdata
->u
.mesh
.mshstats
.fwded_unicast
++;
721 sdata
->u
.mesh
.mshstats
.fwded_frames
++;
726 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
729 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data
*sdata
,
730 struct ieee80211_mgmt
*mgmt
,
733 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
734 struct mesh_path
*mpath
;
736 const u8
*ta
, *target_addr
;
741 ttl
= PERR_IE_TTL(perr_elem
);
743 ifmsh
->mshstats
.dropped_frames_ttl
++;
747 target_addr
= PERR_IE_TARGET_ADDR(perr_elem
);
748 target_sn
= PERR_IE_TARGET_SN(perr_elem
);
749 target_rcode
= PERR_IE_TARGET_RCODE(perr_elem
);
752 mpath
= mesh_path_lookup(sdata
, target_addr
);
754 struct sta_info
*sta
;
756 spin_lock_bh(&mpath
->state_lock
);
757 sta
= next_hop_deref_protected(mpath
);
758 if (mpath
->flags
& MESH_PATH_ACTIVE
&&
759 ether_addr_equal(ta
, sta
->sta
.addr
) &&
760 !(mpath
->flags
& MESH_PATH_FIXED
) &&
761 (!(mpath
->flags
& MESH_PATH_SN_VALID
) ||
762 SN_GT(target_sn
, mpath
->sn
) || target_sn
== 0)) {
763 mpath
->flags
&= ~MESH_PATH_ACTIVE
;
765 mpath
->sn
= target_sn
;
768 spin_unlock_bh(&mpath
->state_lock
);
769 if (!ifmsh
->mshcfg
.dot11MeshForwarding
)
771 mesh_path_error_tx(sdata
, ttl
, target_addr
,
772 target_sn
, target_rcode
,
775 spin_unlock_bh(&mpath
->state_lock
);
781 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data
*sdata
,
782 struct ieee80211_mgmt
*mgmt
,
783 const struct ieee80211_rann_ie
*rann
)
785 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
786 struct ieee80211_local
*local
= sdata
->local
;
787 struct sta_info
*sta
;
788 struct mesh_path
*mpath
;
789 u8 ttl
, flags
, hopcount
;
791 u32 orig_sn
, metric
, metric_txsta
, interval
;
794 ttl
= rann
->rann_ttl
;
795 flags
= rann
->rann_flags
;
796 root_is_gate
= !!(flags
& RANN_FLAG_IS_GATE
);
797 orig_addr
= rann
->rann_addr
;
798 orig_sn
= le32_to_cpu(rann
->rann_seq
);
799 interval
= le32_to_cpu(rann
->rann_interval
);
800 hopcount
= rann
->rann_hopcount
;
802 metric
= le32_to_cpu(rann
->rann_metric
);
804 /* Ignore our own RANNs */
805 if (ether_addr_equal(orig_addr
, sdata
->vif
.addr
))
809 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
810 orig_addr
, mgmt
->sa
, root_is_gate
);
813 sta
= sta_info_get(sdata
, mgmt
->sa
);
819 metric_txsta
= airtime_link_metric_get(local
, sta
);
821 mpath
= mesh_path_lookup(sdata
, orig_addr
);
823 mpath
= mesh_path_add(sdata
, orig_addr
);
826 sdata
->u
.mesh
.mshstats
.dropped_frames_no_route
++;
831 if (!(SN_LT(mpath
->sn
, orig_sn
)) &&
832 !(mpath
->sn
== orig_sn
&& metric
< mpath
->rann_metric
)) {
837 if ((!(mpath
->flags
& (MESH_PATH_ACTIVE
| MESH_PATH_RESOLVING
)) ||
838 (time_after(jiffies
, mpath
->last_preq_to_root
+
839 root_path_confirmation_jiffies(sdata
)) ||
840 time_before(jiffies
, mpath
->last_preq_to_root
))) &&
841 !(mpath
->flags
& MESH_PATH_FIXED
) && (ttl
!= 0)) {
843 "time to refresh root mpath %pM\n",
845 mesh_queue_preq(mpath
, PREQ_Q_F_START
| PREQ_Q_F_REFRESH
);
846 mpath
->last_preq_to_root
= jiffies
;
850 mpath
->rann_metric
= metric
+ metric_txsta
;
851 mpath
->is_root
= true;
852 /* Recording RANNs sender address to send individually
853 * addressed PREQs destined for root mesh STA */
854 memcpy(mpath
->rann_snd_addr
, mgmt
->sa
, ETH_ALEN
);
857 mesh_path_add_gate(mpath
);
860 ifmsh
->mshstats
.dropped_frames_ttl
++;
866 if (ifmsh
->mshcfg
.dot11MeshForwarding
) {
867 mesh_path_sel_frame_tx(MPATH_RANN
, flags
, orig_addr
,
868 orig_sn
, 0, NULL
, 0, broadcast_addr
,
869 hopcount
, ttl
, interval
,
870 metric
+ metric_txsta
, 0, sdata
);
877 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data
*sdata
,
878 struct ieee80211_mgmt
*mgmt
, size_t len
)
880 struct ieee802_11_elems elems
;
883 struct sta_info
*sta
;
885 /* need action_code */
886 if (len
< IEEE80211_MIN_ACTION_SIZE
+ 1)
890 sta
= sta_info_get(sdata
, mgmt
->sa
);
891 if (!sta
|| sta
->mesh
->plink_state
!= NL80211_PLINK_ESTAB
) {
897 baselen
= (u8
*) mgmt
->u
.action
.u
.mesh_action
.variable
- (u8
*) mgmt
;
898 ieee802_11_parse_elems(mgmt
->u
.action
.u
.mesh_action
.variable
,
899 len
- baselen
, false, &elems
);
902 if (elems
.preq_len
!= 37)
903 /* Right now we support just 1 destination and no AE */
905 path_metric
= hwmp_route_info_get(sdata
, mgmt
, elems
.preq
,
908 hwmp_preq_frame_process(sdata
, mgmt
, elems
.preq
,
912 if (elems
.prep_len
!= 31)
913 /* Right now we support no AE */
915 path_metric
= hwmp_route_info_get(sdata
, mgmt
, elems
.prep
,
918 hwmp_prep_frame_process(sdata
, mgmt
, elems
.prep
,
922 if (elems
.perr_len
!= 15)
923 /* Right now we support only one destination per PERR */
925 hwmp_perr_frame_process(sdata
, mgmt
, elems
.perr
);
928 hwmp_rann_frame_process(sdata
, mgmt
, elems
.rann
);
932 * mesh_queue_preq - queue a PREQ to a given destination
934 * @mpath: mesh path to discover
935 * @flags: special attributes of the PREQ to be sent
937 * Locking: the function must be called from within a rcu read lock block.
940 static void mesh_queue_preq(struct mesh_path
*mpath
, u8 flags
)
942 struct ieee80211_sub_if_data
*sdata
= mpath
->sdata
;
943 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
944 struct mesh_preq_queue
*preq_node
;
946 preq_node
= kmalloc(sizeof(struct mesh_preq_queue
), GFP_ATOMIC
);
948 mhwmp_dbg(sdata
, "could not allocate PREQ node\n");
952 spin_lock_bh(&ifmsh
->mesh_preq_queue_lock
);
953 if (ifmsh
->preq_queue_len
== MAX_PREQ_QUEUE_LEN
) {
954 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
956 if (printk_ratelimit())
957 mhwmp_dbg(sdata
, "PREQ node queue full\n");
961 spin_lock(&mpath
->state_lock
);
962 if (mpath
->flags
& MESH_PATH_REQ_QUEUED
) {
963 spin_unlock(&mpath
->state_lock
);
964 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
969 memcpy(preq_node
->dst
, mpath
->dst
, ETH_ALEN
);
970 preq_node
->flags
= flags
;
972 mpath
->flags
|= MESH_PATH_REQ_QUEUED
;
973 spin_unlock(&mpath
->state_lock
);
975 list_add_tail(&preq_node
->list
, &ifmsh
->preq_queue
.list
);
976 ++ifmsh
->preq_queue_len
;
977 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
979 if (time_after(jiffies
, ifmsh
->last_preq
+ min_preq_int_jiff(sdata
)))
980 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
982 else if (time_before(jiffies
, ifmsh
->last_preq
)) {
983 /* avoid long wait if did not send preqs for a long time
984 * and jiffies wrapped around
986 ifmsh
->last_preq
= jiffies
- min_preq_int_jiff(sdata
) - 1;
987 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->work
);
989 mod_timer(&ifmsh
->mesh_path_timer
, ifmsh
->last_preq
+
990 min_preq_int_jiff(sdata
));
994 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
996 * @sdata: local mesh subif
998 void mesh_path_start_discovery(struct ieee80211_sub_if_data
*sdata
)
1000 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
1001 struct mesh_preq_queue
*preq_node
;
1002 struct mesh_path
*mpath
;
1003 u8 ttl
, target_flags
= 0;
1007 spin_lock_bh(&ifmsh
->mesh_preq_queue_lock
);
1008 if (!ifmsh
->preq_queue_len
||
1009 time_before(jiffies
, ifmsh
->last_preq
+
1010 min_preq_int_jiff(sdata
))) {
1011 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
1015 preq_node
= list_first_entry(&ifmsh
->preq_queue
.list
,
1016 struct mesh_preq_queue
, list
);
1017 list_del(&preq_node
->list
);
1018 --ifmsh
->preq_queue_len
;
1019 spin_unlock_bh(&ifmsh
->mesh_preq_queue_lock
);
1022 mpath
= mesh_path_lookup(sdata
, preq_node
->dst
);
1026 spin_lock_bh(&mpath
->state_lock
);
1027 if (mpath
->flags
& (MESH_PATH_DELETED
| MESH_PATH_FIXED
)) {
1028 spin_unlock_bh(&mpath
->state_lock
);
1031 mpath
->flags
&= ~MESH_PATH_REQ_QUEUED
;
1032 if (preq_node
->flags
& PREQ_Q_F_START
) {
1033 if (mpath
->flags
& MESH_PATH_RESOLVING
) {
1034 spin_unlock_bh(&mpath
->state_lock
);
1037 mpath
->flags
&= ~MESH_PATH_RESOLVED
;
1038 mpath
->flags
|= MESH_PATH_RESOLVING
;
1039 mpath
->discovery_retries
= 0;
1040 mpath
->discovery_timeout
= disc_timeout_jiff(sdata
);
1042 } else if (!(mpath
->flags
& MESH_PATH_RESOLVING
) ||
1043 mpath
->flags
& MESH_PATH_RESOLVED
) {
1044 mpath
->flags
&= ~MESH_PATH_RESOLVING
;
1045 spin_unlock_bh(&mpath
->state_lock
);
1049 ifmsh
->last_preq
= jiffies
;
1051 if (time_after(jiffies
, ifmsh
->last_sn_update
+
1052 net_traversal_jiffies(sdata
)) ||
1053 time_before(jiffies
, ifmsh
->last_sn_update
)) {
1055 sdata
->u
.mesh
.last_sn_update
= jiffies
;
1057 lifetime
= default_lifetime(sdata
);
1058 ttl
= sdata
->u
.mesh
.mshcfg
.element_ttl
;
1060 sdata
->u
.mesh
.mshstats
.dropped_frames_ttl
++;
1061 spin_unlock_bh(&mpath
->state_lock
);
1065 if (preq_node
->flags
& PREQ_Q_F_REFRESH
)
1066 target_flags
|= IEEE80211_PREQ_TO_FLAG
;
1068 target_flags
&= ~IEEE80211_PREQ_TO_FLAG
;
1070 spin_unlock_bh(&mpath
->state_lock
);
1071 da
= (mpath
->is_root
) ? mpath
->rann_snd_addr
: broadcast_addr
;
1072 mesh_path_sel_frame_tx(MPATH_PREQ
, 0, sdata
->vif
.addr
, ifmsh
->sn
,
1073 target_flags
, mpath
->dst
, mpath
->sn
, da
, 0,
1074 ttl
, lifetime
, 0, ifmsh
->preq_id
++, sdata
);
1075 mod_timer(&mpath
->timer
, jiffies
+ mpath
->discovery_timeout
);
1083 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
1085 * @skb: 802.11 frame to be sent
1086 * @sdata: network subif the frame will be sent through
1088 * Lookup next hop for given skb and start path discovery if no
1089 * forwarding information is found.
1091 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1092 * skb is freeed here if no mpath could be allocated.
1094 int mesh_nexthop_resolve(struct ieee80211_sub_if_data
*sdata
,
1095 struct sk_buff
*skb
)
1097 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1098 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1099 struct mesh_path
*mpath
;
1100 struct sk_buff
*skb_to_free
= NULL
;
1101 u8
*target_addr
= hdr
->addr3
;
1104 /* Nulls are only sent to peers for PS and should be pre-addressed */
1105 if (ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1109 err
= mesh_nexthop_lookup(sdata
, skb
);
1113 /* no nexthop found, start resolving */
1114 mpath
= mesh_path_lookup(sdata
, target_addr
);
1116 mpath
= mesh_path_add(sdata
, target_addr
);
1117 if (IS_ERR(mpath
)) {
1118 mesh_path_discard_frame(sdata
, skb
);
1119 err
= PTR_ERR(mpath
);
1124 if (!(mpath
->flags
& MESH_PATH_RESOLVING
))
1125 mesh_queue_preq(mpath
, PREQ_Q_F_START
);
1127 if (skb_queue_len(&mpath
->frame_queue
) >= MESH_FRAME_QUEUE_LEN
)
1128 skb_to_free
= skb_dequeue(&mpath
->frame_queue
);
1130 info
->flags
|= IEEE80211_TX_INTFL_NEED_TXPROCESSING
;
1131 ieee80211_set_qos_hdr(sdata
, skb
);
1132 skb_queue_tail(&mpath
->frame_queue
, skb
);
1135 mesh_path_discard_frame(sdata
, skb_to_free
);
1143 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1144 * this function is considered "using" the associated mpath, so preempt a path
1145 * refresh if this mpath expires soon.
1147 * @skb: 802.11 frame to be sent
1148 * @sdata: network subif the frame will be sent through
1150 * Returns: 0 if the next hop was found. Nonzero otherwise.
1152 int mesh_nexthop_lookup(struct ieee80211_sub_if_data
*sdata
,
1153 struct sk_buff
*skb
)
1155 struct mesh_path
*mpath
;
1156 struct sta_info
*next_hop
;
1157 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
1158 u8
*target_addr
= hdr
->addr3
;
1162 mpath
= mesh_path_lookup(sdata
, target_addr
);
1164 if (!mpath
|| !(mpath
->flags
& MESH_PATH_ACTIVE
))
1167 if (time_after(jiffies
,
1169 msecs_to_jiffies(sdata
->u
.mesh
.mshcfg
.path_refresh_time
)) &&
1170 ether_addr_equal(sdata
->vif
.addr
, hdr
->addr4
) &&
1171 !(mpath
->flags
& MESH_PATH_RESOLVING
) &&
1172 !(mpath
->flags
& MESH_PATH_FIXED
))
1173 mesh_queue_preq(mpath
, PREQ_Q_F_START
| PREQ_Q_F_REFRESH
);
1175 next_hop
= rcu_dereference(mpath
->next_hop
);
1177 memcpy(hdr
->addr1
, next_hop
->sta
.addr
, ETH_ALEN
);
1178 memcpy(hdr
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1179 ieee80211_mps_set_frame_flags(sdata
, next_hop
, hdr
);
1188 void mesh_path_timer(unsigned long data
)
1190 struct mesh_path
*mpath
= (void *) data
;
1191 struct ieee80211_sub_if_data
*sdata
= mpath
->sdata
;
1194 if (sdata
->local
->quiescing
)
1197 spin_lock_bh(&mpath
->state_lock
);
1198 if (mpath
->flags
& MESH_PATH_RESOLVED
||
1199 (!(mpath
->flags
& MESH_PATH_RESOLVING
))) {
1200 mpath
->flags
&= ~(MESH_PATH_RESOLVING
| MESH_PATH_RESOLVED
);
1201 spin_unlock_bh(&mpath
->state_lock
);
1202 } else if (mpath
->discovery_retries
< max_preq_retries(sdata
)) {
1203 ++mpath
->discovery_retries
;
1204 mpath
->discovery_timeout
*= 2;
1205 mpath
->flags
&= ~MESH_PATH_REQ_QUEUED
;
1206 spin_unlock_bh(&mpath
->state_lock
);
1207 mesh_queue_preq(mpath
, 0);
1209 mpath
->flags
&= ~(MESH_PATH_RESOLVING
|
1210 MESH_PATH_RESOLVED
|
1211 MESH_PATH_REQ_QUEUED
);
1212 mpath
->exp_time
= jiffies
;
1213 spin_unlock_bh(&mpath
->state_lock
);
1214 if (!mpath
->is_gate
&& mesh_gate_num(sdata
) > 0) {
1215 ret
= mesh_path_send_to_gates(mpath
);
1217 mhwmp_dbg(sdata
, "no gate was reachable\n");
1219 mesh_path_flush_pending(mpath
);
1223 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data
*sdata
)
1225 struct ieee80211_if_mesh
*ifmsh
= &sdata
->u
.mesh
;
1226 u32 interval
= ifmsh
->mshcfg
.dot11MeshHWMPRannInterval
;
1227 u8 flags
, target_flags
= 0;
1229 flags
= (ifmsh
->mshcfg
.dot11MeshGateAnnouncementProtocol
)
1230 ? RANN_FLAG_IS_GATE
: 0;
1232 switch (ifmsh
->mshcfg
.dot11MeshHWMPRootMode
) {
1233 case IEEE80211_PROACTIVE_RANN
:
1234 mesh_path_sel_frame_tx(MPATH_RANN
, flags
, sdata
->vif
.addr
,
1235 ++ifmsh
->sn
, 0, NULL
, 0, broadcast_addr
,
1236 0, ifmsh
->mshcfg
.element_ttl
,
1237 interval
, 0, 0, sdata
);
1239 case IEEE80211_PROACTIVE_PREQ_WITH_PREP
:
1240 flags
|= IEEE80211_PREQ_PROACTIVE_PREP_FLAG
;
1241 case IEEE80211_PROACTIVE_PREQ_NO_PREP
:
1242 interval
= ifmsh
->mshcfg
.dot11MeshHWMPactivePathToRootTimeout
;
1243 target_flags
|= IEEE80211_PREQ_TO_FLAG
|
1244 IEEE80211_PREQ_USN_FLAG
;
1245 mesh_path_sel_frame_tx(MPATH_PREQ
, flags
, sdata
->vif
.addr
,
1246 ++ifmsh
->sn
, target_flags
,
1247 (u8
*) broadcast_addr
, 0, broadcast_addr
,
1248 0, ifmsh
->mshcfg
.element_ttl
, interval
,
1249 0, ifmsh
->preq_id
++, sdata
);
1252 mhwmp_dbg(sdata
, "Proactive mechanism not supported\n");