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Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001/*
Rui Paulo264d9b72009-11-09 23:46:58 +00002 * Copyright (c) 2008, 2009 open80211s Ltd.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01003 * Author: Luis Carlos Cobo <luisca@cozybit.com>
4 *
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.
8 */
9
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/slab.h>
Felix Fietkau888d04d2012-03-01 15:22:09 +010011#include <linux/etherdevice.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010012#include <asm/unaligned.h>
Javier Cardona2cca3972011-09-06 12:10:43 -070013#include "wme.h"
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010014#include "mesh.h"
15
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010016#define TEST_FRAME_LEN 8192
17#define MAX_METRIC 0xffffffff
18#define ARITH_SHIFT 8
Manoharan, Rajkumarfe56c9c2017-02-15 12:46:50 -080019#define LINK_FAIL_THRESH 95
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010020
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010021#define MAX_PREQ_QUEUE_LEN 64
22
Rui Paulo90a5e162009-11-11 00:01:31 +000023static void mesh_queue_preq(struct mesh_path *, u8);
24
Johannes Berg4a3cb702013-02-12 16:43:19 +010025static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae)
Luis Carlos Coboa00de5d2008-02-29 17:07:54 -080026{
27 if (ae)
28 offset += 6;
Harvey Harrisonae7245c2008-05-01 22:19:33 -070029 return get_unaligned_le32(preq_elem + offset);
Luis Carlos Coboa00de5d2008-02-29 17:07:54 -080030}
31
Bob Copelandaee64992014-04-15 10:43:06 -040032static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae)
Rui Paulod611f062009-11-09 23:46:50 +000033{
34 if (ae)
35 offset += 6;
36 return get_unaligned_le16(preq_elem + offset);
37}
38
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010039/* HWMP IE processing macros */
Luis Carlos Coboa00de5d2008-02-29 17:07:54 -080040#define AE_F (1<<6)
41#define AE_F_SET(x) (*x & AE_F)
42#define PREQ_IE_FLAGS(x) (*(x))
43#define PREQ_IE_HOPCOUNT(x) (*(x + 1))
44#define PREQ_IE_TTL(x) (*(x + 2))
45#define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
46#define PREQ_IE_ORIG_ADDR(x) (x + 7)
Phil Carmody497888c2011-07-14 15:07:13 +030047#define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0)
48#define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x))
49#define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x))
Rui Paulod19b3bf2009-11-09 23:46:55 +000050#define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
51#define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
Phil Carmody497888c2011-07-14 15:07:13 +030052#define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x))
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010053
54
Luis Carlos Coboa00de5d2008-02-29 17:07:54 -080055#define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
56#define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
57#define PREP_IE_TTL(x) PREQ_IE_TTL(x)
Thomas Pedersen25d49e42011-08-11 19:35:15 -070058#define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
59#define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x))
Phil Carmody497888c2011-07-14 15:07:13 +030060#define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x))
61#define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x))
Thomas Pedersen25d49e42011-08-11 19:35:15 -070062#define PREP_IE_TARGET_ADDR(x) (x + 3)
63#define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010064
Rui Paulod611f062009-11-09 23:46:50 +000065#define PERR_IE_TTL(x) (*(x))
Rui Paulod19b3bf2009-11-09 23:46:55 +000066#define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
67#define PERR_IE_TARGET_ADDR(x) (x + 3)
Phil Carmody497888c2011-07-14 15:07:13 +030068#define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
69#define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010070
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010071#define MSEC_TO_TU(x) (x*1000/1024)
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +080072#define SN_GT(x, y) ((s32)(y - x) < 0)
73#define SN_LT(x, y) ((s32)(x - y) < 0)
Jesse Jonesd8f03002015-06-12 15:38:07 -070074#define MAX_SANE_SN_DELTA 32
75
76static inline u32 SN_DELTA(u32 x, u32 y)
77{
78 return x >= y ? x - y : y - x;
79}
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010080
81#define net_traversal_jiffies(s) \
Johannes Berg472dbc42008-09-11 00:01:49 +020082 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010083#define default_lifetime(s) \
Johannes Berg472dbc42008-09-11 00:01:49 +020084 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010085#define min_preq_int_jiff(s) \
Johannes Berg472dbc42008-09-11 00:01:49 +020086 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
87#define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010088#define disc_timeout_jiff(s) \
Johannes Berg472dbc42008-09-11 00:01:49 +020089 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +080090#define root_path_confirmation_jiffies(s) \
91 msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010092
93enum mpath_frame_type {
94 MPATH_PREQ = 0,
95 MPATH_PREP,
Rui Paulo90a5e162009-11-11 00:01:31 +000096 MPATH_PERR,
97 MPATH_RANN
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010098};
99
Johannes Berg15ff6362009-11-17 13:34:04 +0100100static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
101
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100102static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800103 const u8 *orig_addr, u32 orig_sn,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100104 u8 target_flags, const u8 *target,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800105 u32 target_sn, const u8 *da,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100106 u8 hop_count, u8 ttl,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800107 u32 lifetime, u32 metric, u32 preq_id,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100108 struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100109{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200110 struct ieee80211_local *local = sdata->local;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700111 struct sk_buff *skb;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100112 struct ieee80211_mgmt *mgmt;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700113 u8 *pos, ie_len;
114 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
115 sizeof(mgmt->u.action.u.mesh_action);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100116
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800117 skb = dev_alloc_skb(local->tx_headroom +
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700118 hdr_len +
119 2 + 37); /* max HWMP IE */
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100120 if (!skb)
121 return -1;
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800122 skb_reserve(skb, local->tx_headroom);
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700123 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
124 memset(mgmt, 0, hdr_len);
Harvey Harrisone7827a72008-07-15 18:44:13 -0700125 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
126 IEEE80211_STYPE_ACTION);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100127
128 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100129 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Rui Paulo90a5e162009-11-11 00:01:31 +0000130 /* BSSID == SA */
Johannes Berg47846c92009-11-25 17:46:19 +0100131 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700132 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
133 mgmt->u.action.u.mesh_action.action_code =
134 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100135
136 switch (action) {
137 case MPATH_PREQ:
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200138 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100139 ie_len = 37;
140 pos = skb_put(skb, 2 + ie_len);
141 *pos++ = WLAN_EID_PREQ;
142 break;
143 case MPATH_PREP:
Chun-Yeow Yeoh0f716512013-04-03 17:49:53 +0800144 mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100145 ie_len = 31;
146 pos = skb_put(skb, 2 + ie_len);
147 *pos++ = WLAN_EID_PREP;
148 break;
Rui Paulo90a5e162009-11-11 00:01:31 +0000149 case MPATH_RANN:
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200150 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr);
Rui Paulo90a5e162009-11-11 00:01:31 +0000151 ie_len = sizeof(struct ieee80211_rann_ie);
152 pos = skb_put(skb, 2 + ie_len);
153 *pos++ = WLAN_EID_RANN;
154 break;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100155 default:
Patrick McHardy812714d2008-05-06 12:52:07 +0200156 kfree_skb(skb);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100157 return -ENOTSUPP;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100158 }
159 *pos++ = ie_len;
160 *pos++ = flags;
161 *pos++ = hop_count;
162 *pos++ = ttl;
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700163 if (action == MPATH_PREP) {
Rui Paulod19b3bf2009-11-09 23:46:55 +0000164 memcpy(pos, target, ETH_ALEN);
Rui Paulo90a5e162009-11-11 00:01:31 +0000165 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800166 put_unaligned_le32(target_sn, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700167 pos += 4;
168 } else {
169 if (action == MPATH_PREQ) {
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800170 put_unaligned_le32(preq_id, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700171 pos += 4;
172 }
173 memcpy(pos, orig_addr, ETH_ALEN);
174 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800175 put_unaligned_le32(orig_sn, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700176 pos += 4;
177 }
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800178 put_unaligned_le32(lifetime, pos); /* interval for RANN */
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700179 pos += 4;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800180 put_unaligned_le32(metric, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700181 pos += 4;
182 if (action == MPATH_PREQ) {
183 *pos++ = 1; /* destination count */
184 *pos++ = target_flags;
185 memcpy(pos, target, ETH_ALEN);
186 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800187 put_unaligned_le32(target_sn, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700188 pos += 4;
189 } else if (action == MPATH_PREP) {
190 memcpy(pos, orig_addr, ETH_ALEN);
191 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800192 put_unaligned_le32(orig_sn, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700193 pos += 4;
Rui Paulo90a5e162009-11-11 00:01:31 +0000194 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100195
Johannes Berg62ae67b2009-11-18 18:42:05 +0100196 ieee80211_tx_skb(sdata, skb);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100197 return 0;
198}
199
Javier Cardona2cca3972011-09-06 12:10:43 -0700200
201/* Headroom is not adjusted. Caller should ensure that skb has sufficient
202 * headroom in case the frame is encrypted. */
203static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
204 struct sk_buff *skb)
205{
Javier Cardona2cca3972011-09-06 12:10:43 -0700206 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100207 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Javier Cardona2cca3972011-09-06 12:10:43 -0700208
Zhang Shengjud57a5442016-03-03 01:16:56 +0000209 skb_reset_mac_header(skb);
210 skb_reset_network_header(skb);
211 skb_reset_transport_header(skb);
Javier Cardona2cca3972011-09-06 12:10:43 -0700212
213 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
214 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
215 skb->priority = 7;
216
217 info->control.vif = &sdata->vif;
Bob Copeland9cbbffe2013-01-09 12:34:55 -0500218 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Javier Cardona2154c812011-09-07 17:49:53 -0700219 ieee80211_set_qos_hdr(sdata, skb);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100220 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
Javier Cardona2cca3972011-09-06 12:10:43 -0700221}
222
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100223/**
Bob Copeland75ea7192013-01-03 00:09:46 -0500224 * mesh_path_error_tx - Sends a PERR mesh management frame
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100225 *
Bob Copeland75ea7192013-01-03 00:09:46 -0500226 * @ttl: allowed remaining hops
Rui Paulod19b3bf2009-11-09 23:46:55 +0000227 * @target: broken destination
228 * @target_sn: SN of the broken destination
229 * @target_rcode: reason code for this PERR
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100230 * @ra: node this frame is addressed to
Bob Copeland75ea7192013-01-03 00:09:46 -0500231 * @sdata: local mesh subif
Javier Cardona2cca3972011-09-06 12:10:43 -0700232 *
233 * Note: This function may be called with driver locks taken that the driver
234 * also acquires in the TX path. To avoid a deadlock we don't transmit the
235 * frame directly but add it to the pending queue instead.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100236 */
Johannes Bergbf7cd942013-02-15 14:40:31 +0100237int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800238 u8 ttl, const u8 *target, u32 target_sn,
239 u16 target_rcode, const u8 *ra)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100240{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200241 struct ieee80211_local *local = sdata->local;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700242 struct sk_buff *skb;
Thomas Pedersendca7e942011-11-24 17:15:24 -0800243 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100244 struct ieee80211_mgmt *mgmt;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700245 u8 *pos, ie_len;
246 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
247 sizeof(mgmt->u.action.u.mesh_action);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100248
Thomas Pedersendca7e942011-11-24 17:15:24 -0800249 if (time_before(jiffies, ifmsh->next_perr))
250 return -EAGAIN;
251
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800252 skb = dev_alloc_skb(local->tx_headroom +
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200253 sdata->encrypt_headroom +
Bob Copeland86804512013-01-09 12:34:56 -0500254 IEEE80211_ENCRYPT_TAILROOM +
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700255 hdr_len +
256 2 + 15 /* PERR IE */);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100257 if (!skb)
258 return -1;
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200259 skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom);
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700260 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
261 memset(mgmt, 0, hdr_len);
Harvey Harrisone7827a72008-07-15 18:44:13 -0700262 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
263 IEEE80211_STYPE_ACTION);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100264
265 memcpy(mgmt->da, ra, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100266 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700267 /* BSSID == SA */
268 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
269 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
270 mgmt->u.action.u.mesh_action.action_code =
271 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
Rui Paulod611f062009-11-09 23:46:50 +0000272 ie_len = 15;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100273 pos = skb_put(skb, 2 + ie_len);
274 *pos++ = WLAN_EID_PERR;
275 *pos++ = ie_len;
Rui Paulod611f062009-11-09 23:46:50 +0000276 /* ttl */
Javier Cardona45904f22010-12-03 09:20:40 +0100277 *pos++ = ttl;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100278 /* number of destinations */
279 *pos++ = 1;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800280 /* Flags field has AE bit only as defined in
281 * sec 8.4.2.117 IEEE802.11-2012
Rui Paulod611f062009-11-09 23:46:50 +0000282 */
283 *pos = 0;
Rui Paulod611f062009-11-09 23:46:50 +0000284 pos++;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000285 memcpy(pos, target, ETH_ALEN);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100286 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800287 put_unaligned_le32(target_sn, pos);
Rui Paulod611f062009-11-09 23:46:50 +0000288 pos += 4;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800289 put_unaligned_le16(target_rcode, pos);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100290
Javier Cardona2cca3972011-09-06 12:10:43 -0700291 /* see note in function header */
292 prepare_frame_for_deferred_tx(sdata, skb);
Thomas Pedersendca7e942011-11-24 17:15:24 -0800293 ifmsh->next_perr = TU_TO_EXP_TIME(
294 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval);
Javier Cardona2cca3972011-09-06 12:10:43 -0700295 ieee80211_add_pending_skb(local, skb);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100296 return 0;
297}
298
Javier Cardonabfc32e62009-08-17 17:15:55 -0700299void ieee80211s_update_metric(struct ieee80211_local *local,
Javier Cardona35b3fe1c2012-06-08 13:30:25 -0700300 struct sta_info *sta, struct sk_buff *skb)
Javier Cardonabfc32e62009-08-17 17:15:55 -0700301{
302 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
303 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
304 int failed;
305
306 if (!ieee80211_is_data(hdr->frame_control))
307 return;
308
309 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
310
Manoharan, Rajkumar3eb09282017-02-14 12:27:16 -0800311 /* moving average, scaled to 100.
312 * feed failure as 100 and success as 0
313 */
314 ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, failed * 100);
Manoharan, Rajkumarfe56c9c2017-02-15 12:46:50 -0800315 if (ewma_mesh_fail_avg_read(&sta->mesh->fail_avg) >
316 LINK_FAIL_THRESH)
Javier Cardona35b3fe1c2012-06-08 13:30:25 -0700317 mesh_plink_broken(sta);
Javier Cardonabfc32e62009-08-17 17:15:55 -0700318}
319
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100320static u32 airtime_link_metric_get(struct ieee80211_local *local,
321 struct sta_info *sta)
322{
Thomas Pedersen6b62bf32012-03-05 15:31:48 -0800323 struct rate_info rinfo;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100324 /* This should be adjusted for each device */
325 int device_constant = 1 << ARITH_SHIFT;
326 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
327 int s_unit = 1 << ARITH_SHIFT;
328 int rate, err;
329 u32 tx_time, estimated_retx;
330 u64 result;
Manoharan, Rajkumar3eb09282017-02-14 12:27:16 -0800331 unsigned long fail_avg =
332 ewma_mesh_fail_avg_read(&sta->mesh->fail_avg);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100333
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300334 /* Try to get rate based on HW/SW RC algorithm.
335 * Rate is returned in units of Kbps, correct this
336 * to comply with airtime calculation units
337 * Round up in case we get rate < 100Kbps
338 */
339 rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 100);
Johannes Berge6a98542008-10-21 12:40:02 +0200340
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300341 if (rate) {
342 err = 0;
343 } else {
Manoharan, Rajkumarfe56c9c2017-02-15 12:46:50 -0800344 if (fail_avg > LINK_FAIL_THRESH)
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300345 return MAX_METRIC;
Johannes Berge6a98542008-10-21 12:40:02 +0200346
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300347 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
348 rate = cfg80211_calculate_bitrate(&rinfo);
349 if (WARN_ON(!rate))
350 return MAX_METRIC;
351
Manoharan, Rajkumar3eb09282017-02-14 12:27:16 -0800352 err = (fail_avg << ARITH_SHIFT) / 100;
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300353 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100354
355 /* bitrate is in units of 100 Kbps, while we need rate in units of
356 * 1Mbps. This will be corrected on tx_time computation.
357 */
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100358 tx_time = (device_constant + 10 * test_frame_len / rate);
359 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300360 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100361 return (u32)result;
362}
363
364/**
365 * hwmp_route_info_get - Update routing info to originator and transmitter
366 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200367 * @sdata: local mesh subif
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100368 * @mgmt: mesh management frame
369 * @hwmp_ie: hwmp information element (PREP or PREQ)
Bob Copeland75ea7192013-01-03 00:09:46 -0500370 * @action: type of hwmp ie
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100371 *
372 * This function updates the path routing information to the originator and the
Andrey Yurovskyf99288d2009-10-20 12:17:34 -0700373 * transmitter of a HWMP PREQ or PREP frame.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100374 *
375 * Returns: metric to frame originator or 0 if the frame should not be further
376 * processed
377 *
378 * Notes: this function is the only place (besides user-provided info) where
379 * path routing information is updated.
380 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200381static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100382 struct ieee80211_mgmt *mgmt,
383 const u8 *hwmp_ie, enum mpath_frame_type action)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100384{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200385 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100386 struct mesh_path *mpath;
387 struct sta_info *sta;
388 bool fresh_info;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100389 const u8 *orig_addr, *ta;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000390 u32 orig_sn, orig_metric;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100391 unsigned long orig_lifetime, exp_time;
392 u32 last_hop_metric, new_metric;
393 bool process = true;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100394
395 rcu_read_lock();
Johannes Bergabe60632009-11-25 17:46:18 +0100396 sta = sta_info_get(sdata, mgmt->sa);
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100397 if (!sta) {
398 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100399 return 0;
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100400 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100401
402 last_hop_metric = airtime_link_metric_get(local, sta);
403 /* Update and check originator routing info */
404 fresh_info = true;
405
406 switch (action) {
407 case MPATH_PREQ:
408 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000409 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100410 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
411 orig_metric = PREQ_IE_METRIC(hwmp_ie);
412 break;
413 case MPATH_PREP:
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800414 /* Originator here refers to the MP that was the target in the
415 * Path Request. We divert from the nomenclature in the draft
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100416 * so that we can easily use a single function to gather path
417 * information from both PREQ and PREP frames.
418 */
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800419 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
420 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100421 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
422 orig_metric = PREP_IE_METRIC(hwmp_ie);
423 break;
424 default:
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100425 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100426 return 0;
427 }
428 new_metric = orig_metric + last_hop_metric;
429 if (new_metric < orig_metric)
430 new_metric = MAX_METRIC;
431 exp_time = TU_TO_EXP_TIME(orig_lifetime);
432
Joe Perchesb203ca32012-05-08 18:56:52 +0000433 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100434 /* This MP is the originator, we are not interested in this
435 * frame, except for updating transmitter's path info.
436 */
437 process = false;
438 fresh_info = false;
439 } else {
Johannes Bergbf7cd942013-02-15 14:40:31 +0100440 mpath = mesh_path_lookup(sdata, orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100441 if (mpath) {
442 spin_lock_bh(&mpath->state_lock);
443 if (mpath->flags & MESH_PATH_FIXED)
444 fresh_info = false;
445 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
Rui Paulod19b3bf2009-11-09 23:46:55 +0000446 (mpath->flags & MESH_PATH_SN_VALID)) {
447 if (SN_GT(mpath->sn, orig_sn) ||
448 (mpath->sn == orig_sn &&
Porsch, Marco533866b2010-02-24 09:53:13 +0100449 new_metric >= mpath->metric)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100450 process = false;
451 fresh_info = false;
452 }
Jesse Jonesd8f03002015-06-12 15:38:07 -0700453 } else if (!(mpath->flags & MESH_PATH_ACTIVE)) {
454 bool have_sn, newer_sn, bounced;
455
456 have_sn = mpath->flags & MESH_PATH_SN_VALID;
457 newer_sn = have_sn && SN_GT(orig_sn, mpath->sn);
458 bounced = have_sn &&
459 (SN_DELTA(orig_sn, mpath->sn) >
460 MAX_SANE_SN_DELTA);
461
462 if (!have_sn || newer_sn) {
463 /* if SN is newer than what we had
464 * then we can take it */;
465 } else if (bounced) {
466 /* if SN is way different than what
467 * we had then assume the other side
468 * rebooted or restarted */;
469 } else {
470 process = false;
471 fresh_info = false;
472 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100473 }
474 } else {
Bob Copelandae76eef2013-03-29 09:38:39 -0400475 mpath = mesh_path_add(sdata, orig_addr);
476 if (IS_ERR(mpath)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100477 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100478 return 0;
479 }
480 spin_lock_bh(&mpath->state_lock);
481 }
482
483 if (fresh_info) {
484 mesh_path_assign_nexthop(mpath, sta);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000485 mpath->flags |= MESH_PATH_SN_VALID;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100486 mpath->metric = new_metric;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000487 mpath->sn = orig_sn;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100488 mpath->exp_time = time_after(mpath->exp_time, exp_time)
489 ? mpath->exp_time : exp_time;
490 mesh_path_activate(mpath);
491 spin_unlock_bh(&mpath->state_lock);
Manoharan, Rajkumar3eb09282017-02-14 12:27:16 -0800492 ewma_mesh_fail_avg_init(&sta->mesh->fail_avg);
493 /* init it at a low value - 0 start is tricky */
494 ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100495 mesh_path_tx_pending(mpath);
496 /* draft says preq_id should be saved to, but there does
497 * not seem to be any use for it, skipping by now
498 */
499 } else
500 spin_unlock_bh(&mpath->state_lock);
501 }
502
503 /* Update and check transmitter routing info */
504 ta = mgmt->sa;
Joe Perchesb203ca32012-05-08 18:56:52 +0000505 if (ether_addr_equal(orig_addr, ta))
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100506 fresh_info = false;
507 else {
508 fresh_info = true;
509
Johannes Bergbf7cd942013-02-15 14:40:31 +0100510 mpath = mesh_path_lookup(sdata, ta);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100511 if (mpath) {
512 spin_lock_bh(&mpath->state_lock);
513 if ((mpath->flags & MESH_PATH_FIXED) ||
514 ((mpath->flags & MESH_PATH_ACTIVE) &&
515 (last_hop_metric > mpath->metric)))
516 fresh_info = false;
517 } else {
Bob Copelandae76eef2013-03-29 09:38:39 -0400518 mpath = mesh_path_add(sdata, ta);
519 if (IS_ERR(mpath)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100520 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100521 return 0;
522 }
523 spin_lock_bh(&mpath->state_lock);
524 }
525
526 if (fresh_info) {
527 mesh_path_assign_nexthop(mpath, sta);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100528 mpath->metric = last_hop_metric;
529 mpath->exp_time = time_after(mpath->exp_time, exp_time)
530 ? mpath->exp_time : exp_time;
531 mesh_path_activate(mpath);
532 spin_unlock_bh(&mpath->state_lock);
Manoharan, Rajkumar3eb09282017-02-14 12:27:16 -0800533 ewma_mesh_fail_avg_init(&sta->mesh->fail_avg);
534 /* init it at a low value - 0 start is tricky */
535 ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100536 mesh_path_tx_pending(mpath);
537 } else
538 spin_unlock_bh(&mpath->state_lock);
539 }
540
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100541 rcu_read_unlock();
542
543 return process ? new_metric : 0;
544}
545
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200546static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100547 struct ieee80211_mgmt *mgmt,
Alexis Green5ec596c2015-06-09 16:20:24 -0700548 const u8 *preq_elem, u32 orig_metric)
David Woo57ef5dd2009-08-12 11:03:43 -0700549{
Johannes Berg472dbc42008-09-11 00:01:49 +0200550 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800551 struct mesh_path *mpath = NULL;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100552 const u8 *target_addr, *orig_addr;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800553 const u8 *da;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800554 u8 target_flags, ttl, flags;
Jeff Mahoneyb4201cc2016-04-04 14:15:23 -0400555 u32 orig_sn, target_sn, lifetime, target_metric = 0;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100556 bool reply = false;
557 bool forward = true;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800558 bool root_is_gate;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100559
Rui Paulod19b3bf2009-11-09 23:46:55 +0000560 /* Update target SN, if present */
561 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100562 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000563 target_sn = PREQ_IE_TARGET_SN(preq_elem);
564 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
565 target_flags = PREQ_IE_TARGET_F(preq_elem);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800566 /* Proactive PREQ gate announcements */
567 flags = PREQ_IE_FLAGS(preq_elem);
568 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100569
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200570 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
Rui Paulo27db2e42009-11-09 23:46:45 +0000571
Joe Perchesb203ca32012-05-08 18:56:52 +0000572 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200573 mhwmp_dbg(sdata, "PREQ is for us\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100574 forward = false;
575 reply = true;
Alexis Green5ec596c2015-06-09 16:20:24 -0700576 target_metric = 0;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000577 if (time_after(jiffies, ifmsh->last_sn_update +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100578 net_traversal_jiffies(sdata)) ||
Rui Paulod19b3bf2009-11-09 23:46:55 +0000579 time_before(jiffies, ifmsh->last_sn_update)) {
Bob Copelandbc3ce0b2014-04-15 10:43:08 -0400580 ++ifmsh->sn;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000581 ifmsh->last_sn_update = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100582 }
Bob Copelandbc3ce0b2014-04-15 10:43:08 -0400583 target_sn = ifmsh->sn;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800584 } else if (is_broadcast_ether_addr(target_addr) &&
585 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
586 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100587 mpath = mesh_path_lookup(sdata, orig_addr);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800588 if (mpath) {
589 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
590 reply = true;
591 target_addr = sdata->vif.addr;
592 target_sn = ++ifmsh->sn;
Alexis Green5ec596c2015-06-09 16:20:24 -0700593 target_metric = 0;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800594 ifmsh->last_sn_update = jiffies;
595 }
596 if (root_is_gate)
597 mesh_path_add_gate(mpath);
598 }
599 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100600 } else {
601 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100602 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100603 if (mpath) {
Rui Paulod19b3bf2009-11-09 23:46:55 +0000604 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
605 SN_LT(mpath->sn, target_sn)) {
606 mpath->sn = target_sn;
607 mpath->flags |= MESH_PATH_SN_VALID;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800608 } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) &&
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100609 (mpath->flags & MESH_PATH_ACTIVE)) {
610 reply = true;
Alexis Green5ec596c2015-06-09 16:20:24 -0700611 target_metric = mpath->metric;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000612 target_sn = mpath->sn;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800613 /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/
614 target_flags |= IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100615 }
616 }
617 rcu_read_unlock();
618 }
619
620 if (reply) {
621 lifetime = PREQ_IE_LIFETIME(preq_elem);
Javier Cardona45904f22010-12-03 09:20:40 +0100622 ttl = ifmsh->mshcfg.element_ttl;
Rui Paulo27db2e42009-11-09 23:46:45 +0000623 if (ttl != 0) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200624 mhwmp_dbg(sdata, "replying to the PREQ\n");
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800625 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800626 orig_sn, 0, target_addr,
627 target_sn, mgmt->sa, 0, ttl,
Alexis Green5ec596c2015-06-09 16:20:24 -0700628 lifetime, target_metric, 0,
629 sdata);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800630 } else {
Johannes Berg472dbc42008-09-11 00:01:49 +0200631 ifmsh->mshstats.dropped_frames_ttl++;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800632 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100633 }
634
Chun-Yeow Yeoh94f90652012-01-21 01:02:16 +0800635 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100636 u32 preq_id;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800637 u8 hopcount;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100638
639 ttl = PREQ_IE_TTL(preq_elem);
640 lifetime = PREQ_IE_LIFETIME(preq_elem);
641 if (ttl <= 1) {
Johannes Berg472dbc42008-09-11 00:01:49 +0200642 ifmsh->mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100643 return;
644 }
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200645 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100646 --ttl;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100647 preq_id = PREQ_IE_PREQ_ID(preq_elem);
648 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800649 da = (mpath && mpath->is_root) ?
650 mpath->rann_snd_addr : broadcast_addr;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800651
652 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
653 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
654 target_sn = PREQ_IE_TARGET_SN(preq_elem);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800655 }
656
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100657 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800658 orig_sn, target_flags, target_addr,
659 target_sn, da, hopcount, ttl, lifetime,
Alexis Green5ec596c2015-06-09 16:20:24 -0700660 orig_metric, preq_id, sdata);
Chun-Yeow Yeoh7d4e15b2012-05-04 14:57:50 +0800661 if (!is_multicast_ether_addr(da))
662 ifmsh->mshstats.fwded_unicast++;
663 else
664 ifmsh->mshstats.fwded_mcast++;
Johannes Berg472dbc42008-09-11 00:01:49 +0200665 ifmsh->mshstats.fwded_frames++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100666 }
667}
668
669
Johannes Berg40b275b2011-05-13 14:15:49 +0200670static inline struct sta_info *
671next_hop_deref_protected(struct mesh_path *mpath)
672{
673 return rcu_dereference_protected(mpath->next_hop,
674 lockdep_is_held(&mpath->state_lock));
675}
676
677
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200678static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100679 struct ieee80211_mgmt *mgmt,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100680 const u8 *prep_elem, u32 metric)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100681{
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800682 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100683 struct mesh_path *mpath;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100684 const u8 *target_addr, *orig_addr;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100685 u8 ttl, hopcount, flags;
686 u8 next_hop[ETH_ALEN];
Rui Paulod19b3bf2009-11-09 23:46:55 +0000687 u32 target_sn, orig_sn, lifetime;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100688
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200689 mhwmp_dbg(sdata, "received PREP from %pM\n",
Chun-Yeow Yeoh0f716512013-04-03 17:49:53 +0800690 PREP_IE_TARGET_ADDR(prep_elem));
Rui Paulodbb81c42009-11-09 23:46:46 +0000691
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800692 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
Joe Perchesb203ca32012-05-08 18:56:52 +0000693 if (ether_addr_equal(orig_addr, sdata->vif.addr))
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100694 /* destination, no forwarding required */
695 return;
696
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800697 if (!ifmsh->mshcfg.dot11MeshForwarding)
698 return;
699
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100700 ttl = PREP_IE_TTL(prep_elem);
701 if (ttl <= 1) {
Johannes Berg472dbc42008-09-11 00:01:49 +0200702 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100703 return;
704 }
705
706 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100707 mpath = mesh_path_lookup(sdata, orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100708 if (mpath)
709 spin_lock_bh(&mpath->state_lock);
710 else
711 goto fail;
712 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
713 spin_unlock_bh(&mpath->state_lock);
714 goto fail;
715 }
Johannes Berg40b275b2011-05-13 14:15:49 +0200716 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100717 spin_unlock_bh(&mpath->state_lock);
718 --ttl;
719 flags = PREP_IE_FLAGS(prep_elem);
720 lifetime = PREP_IE_LIFETIME(prep_elem);
721 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800722 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000723 target_sn = PREP_IE_TARGET_SN(prep_elem);
724 orig_sn = PREP_IE_ORIG_SN(prep_elem);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100725
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800726 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0,
727 target_addr, target_sn, next_hop, hopcount,
728 ttl, lifetime, metric, 0, sdata);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100729 rcu_read_unlock();
Daniel Walkerc8a61a72009-08-18 10:59:00 -0700730
731 sdata->u.mesh.mshstats.fwded_unicast++;
Johannes Berg472dbc42008-09-11 00:01:49 +0200732 sdata->u.mesh.mshstats.fwded_frames++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100733 return;
734
735fail:
736 rcu_read_unlock();
Johannes Berg472dbc42008-09-11 00:01:49 +0200737 sdata->u.mesh.mshstats.dropped_frames_no_route++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100738}
739
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200740static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100741 struct ieee80211_mgmt *mgmt,
742 const u8 *perr_elem)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100743{
Rui Paulod611f062009-11-09 23:46:50 +0000744 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100745 struct mesh_path *mpath;
Rui Paulod611f062009-11-09 23:46:50 +0000746 u8 ttl;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100747 const u8 *ta, *target_addr;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000748 u32 target_sn;
749 u16 target_rcode;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100750
751 ta = mgmt->sa;
Rui Paulod611f062009-11-09 23:46:50 +0000752 ttl = PERR_IE_TTL(perr_elem);
753 if (ttl <= 1) {
754 ifmsh->mshstats.dropped_frames_ttl++;
755 return;
756 }
757 ttl--;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000758 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
759 target_sn = PERR_IE_TARGET_SN(perr_elem);
760 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
Rui Paulod611f062009-11-09 23:46:50 +0000761
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100762 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100763 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100764 if (mpath) {
Felix Fietkau888d04d2012-03-01 15:22:09 +0100765 struct sta_info *sta;
766
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100767 spin_lock_bh(&mpath->state_lock);
Felix Fietkau888d04d2012-03-01 15:22:09 +0100768 sta = next_hop_deref_protected(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100769 if (mpath->flags & MESH_PATH_ACTIVE &&
Joe Perchesb203ca32012-05-08 18:56:52 +0000770 ether_addr_equal(ta, sta->sta.addr) &&
Pedersen, Thomas5df20f22016-09-06 11:59:00 -0700771 !(mpath->flags & MESH_PATH_FIXED) &&
Rui Paulod19b3bf2009-11-09 23:46:55 +0000772 (!(mpath->flags & MESH_PATH_SN_VALID) ||
Alexis Green703ee732015-06-10 11:02:09 -0700773 SN_GT(target_sn, mpath->sn) || target_sn == 0)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100774 mpath->flags &= ~MESH_PATH_ACTIVE;
Alexis Green703ee732015-06-10 11:02:09 -0700775 if (target_sn != 0)
776 mpath->sn = target_sn;
777 else
778 mpath->sn += 1;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100779 spin_unlock_bh(&mpath->state_lock);
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800780 if (!ifmsh->mshcfg.dot11MeshForwarding)
781 goto endperr;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100782 mesh_path_error_tx(sdata, ttl, target_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800783 target_sn, target_rcode,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100784 broadcast_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100785 } else
786 spin_unlock_bh(&mpath->state_lock);
787 }
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800788endperr:
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100789 rcu_read_unlock();
790}
791
Rui Paulo90a5e162009-11-11 00:01:31 +0000792static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100793 struct ieee80211_mgmt *mgmt,
794 const struct ieee80211_rann_ie *rann)
Rui Paulo90a5e162009-11-11 00:01:31 +0000795{
796 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800797 struct ieee80211_local *local = sdata->local;
798 struct sta_info *sta;
Rui Paulo90a5e162009-11-11 00:01:31 +0000799 struct mesh_path *mpath;
Rui Paulo90a5e162009-11-11 00:01:31 +0000800 u8 ttl, flags, hopcount;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100801 const u8 *orig_addr;
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800802 u32 orig_sn, metric, metric_txsta, interval;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700803 bool root_is_gate;
Rui Paulo90a5e162009-11-11 00:01:31 +0000804
Rui Paulo90a5e162009-11-11 00:01:31 +0000805 ttl = rann->rann_ttl;
Rui Paulo90a5e162009-11-11 00:01:31 +0000806 flags = rann->rann_flags;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700807 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
Rui Paulo90a5e162009-11-11 00:01:31 +0000808 orig_addr = rann->rann_addr;
Chun-Yeow Yeoh292c41a2012-03-19 21:38:46 +0800809 orig_sn = le32_to_cpu(rann->rann_seq);
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800810 interval = le32_to_cpu(rann->rann_interval);
Rui Paulo90a5e162009-11-11 00:01:31 +0000811 hopcount = rann->rann_hopcount;
Rui Pauloa6a58b42009-11-09 23:46:51 +0000812 hopcount++;
Chun-Yeow Yeoh292c41a2012-03-19 21:38:46 +0800813 metric = le32_to_cpu(rann->rann_metric);
Javier Cardona5ee68e52011-08-09 16:45:08 -0700814
815 /* Ignore our own RANNs */
Joe Perchesb203ca32012-05-08 18:56:52 +0000816 if (ether_addr_equal(orig_addr, sdata->vif.addr))
Javier Cardona5ee68e52011-08-09 16:45:08 -0700817 return;
818
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200819 mhwmp_dbg(sdata,
820 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
821 orig_addr, mgmt->sa, root_is_gate);
Rui Paulo90a5e162009-11-11 00:01:31 +0000822
823 rcu_read_lock();
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800824 sta = sta_info_get(sdata, mgmt->sa);
825 if (!sta) {
826 rcu_read_unlock();
827 return;
828 }
829
830 metric_txsta = airtime_link_metric_get(local, sta);
831
Johannes Bergbf7cd942013-02-15 14:40:31 +0100832 mpath = mesh_path_lookup(sdata, orig_addr);
Rui Paulo90a5e162009-11-11 00:01:31 +0000833 if (!mpath) {
Bob Copelandae76eef2013-03-29 09:38:39 -0400834 mpath = mesh_path_add(sdata, orig_addr);
835 if (IS_ERR(mpath)) {
Rui Paulo90a5e162009-11-11 00:01:31 +0000836 rcu_read_unlock();
837 sdata->u.mesh.mshstats.dropped_frames_no_route++;
838 return;
839 }
Rui Paulo90a5e162009-11-11 00:01:31 +0000840 }
Javier Cardona5ee68e52011-08-09 16:45:08 -0700841
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800842 if (!(SN_LT(mpath->sn, orig_sn)) &&
843 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) {
844 rcu_read_unlock();
845 return;
846 }
847
Javier Cardona5ee68e52011-08-09 16:45:08 -0700848 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +0800849 (time_after(jiffies, mpath->last_preq_to_root +
850 root_path_confirmation_jiffies(sdata)) ||
851 time_before(jiffies, mpath->last_preq_to_root))) &&
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800852 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200853 mhwmp_dbg(sdata,
854 "time to refresh root mpath %pM\n",
855 orig_addr);
Javier Cardona5ee68e52011-08-09 16:45:08 -0700856 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +0800857 mpath->last_preq_to_root = jiffies;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700858 }
859
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800860 mpath->sn = orig_sn;
861 mpath->rann_metric = metric + metric_txsta;
862 mpath->is_root = true;
863 /* Recording RANNs sender address to send individually
864 * addressed PREQs destined for root mesh STA */
865 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
866
867 if (root_is_gate)
868 mesh_path_add_gate(mpath);
869
870 if (ttl <= 1) {
871 ifmsh->mshstats.dropped_frames_ttl++;
872 rcu_read_unlock();
873 return;
874 }
875 ttl--;
876
877 if (ifmsh->mshcfg.dot11MeshForwarding) {
Rui Paulo90a5e162009-11-11 00:01:31 +0000878 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800879 orig_sn, 0, NULL, 0, broadcast_addr,
880 hopcount, ttl, interval,
881 metric + metric_txsta, 0, sdata);
Rui Paulo90a5e162009-11-11 00:01:31 +0000882 }
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800883
Rui Paulo90a5e162009-11-11 00:01:31 +0000884 rcu_read_unlock();
885}
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100886
887
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200888void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100889 struct ieee80211_mgmt *mgmt, size_t len)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100890{
891 struct ieee802_11_elems elems;
892 size_t baselen;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700893 u32 path_metric;
Javier Cardona97091312011-10-06 14:54:22 -0700894 struct sta_info *sta;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100895
Johannes Berg9c80d3d2008-09-08 15:41:59 +0200896 /* need action_code */
897 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
898 return;
899
Javier Cardona97091312011-10-06 14:54:22 -0700900 rcu_read_lock();
901 sta = sta_info_get(sdata, mgmt->sa);
Johannes Berg433f5bc2015-06-17 10:31:00 +0200902 if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
Javier Cardona97091312011-10-06 14:54:22 -0700903 rcu_read_unlock();
904 return;
905 }
906 rcu_read_unlock();
907
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100908 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
909 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
Johannes Bergb2e506b2013-03-26 14:54:16 +0100910 len - baselen, false, &elems);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100911
Rui Paulodbb81c42009-11-09 23:46:46 +0000912 if (elems.preq) {
913 if (elems.preq_len != 37)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100914 /* Right now we support just 1 destination and no AE */
915 return;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700916 path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
917 MPATH_PREQ);
918 if (path_metric)
Rui Paulodbb81c42009-11-09 23:46:46 +0000919 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
Alexis Greenafd2efb2015-06-05 12:43:54 -0700920 path_metric);
Rui Paulodbb81c42009-11-09 23:46:46 +0000921 }
922 if (elems.prep) {
923 if (elems.prep_len != 31)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100924 /* Right now we support no AE */
925 return;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700926 path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
927 MPATH_PREP);
928 if (path_metric)
Rui Paulodbb81c42009-11-09 23:46:46 +0000929 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
Alexis Greenafd2efb2015-06-05 12:43:54 -0700930 path_metric);
Rui Paulodbb81c42009-11-09 23:46:46 +0000931 }
932 if (elems.perr) {
Rui Paulod611f062009-11-09 23:46:50 +0000933 if (elems.perr_len != 15)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100934 /* Right now we support only one destination per PERR */
935 return;
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200936 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100937 }
Rui Paulo90a5e162009-11-11 00:01:31 +0000938 if (elems.rann)
939 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100940}
941
942/**
943 * mesh_queue_preq - queue a PREQ to a given destination
944 *
945 * @mpath: mesh path to discover
946 * @flags: special attributes of the PREQ to be sent
947 *
948 * Locking: the function must be called from within a rcu read lock block.
949 *
950 */
951static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
952{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200953 struct ieee80211_sub_if_data *sdata = mpath->sdata;
Johannes Berg472dbc42008-09-11 00:01:49 +0200954 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100955 struct mesh_preq_queue *preq_node;
956
Andrey Yurovsky59615b52009-06-25 16:07:42 -0700957 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100958 if (!preq_node) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200959 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100960 return;
961 }
962
Baruch Siach987dafa2011-07-28 08:51:05 +0300963 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
Johannes Berg472dbc42008-09-11 00:01:49 +0200964 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
Baruch Siach987dafa2011-07-28 08:51:05 +0300965 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100966 kfree(preq_node);
967 if (printk_ratelimit())
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200968 mhwmp_dbg(sdata, "PREQ node queue full\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100969 return;
970 }
971
Johannes Bergf2dc7982011-11-18 15:27:31 +0100972 spin_lock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700973 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
Johannes Bergf2dc7982011-11-18 15:27:31 +0100974 spin_unlock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700975 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Dan Carpenter88d53462011-11-15 09:33:31 +0300976 kfree(preq_node);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700977 return;
978 }
979
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100980 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
981 preq_node->flags = flags;
982
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700983 mpath->flags |= MESH_PATH_REQ_QUEUED;
Johannes Bergf2dc7982011-11-18 15:27:31 +0100984 spin_unlock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700985
Johannes Berg472dbc42008-09-11 00:01:49 +0200986 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
987 ++ifmsh->preq_queue_len;
Baruch Siach987dafa2011-07-28 08:51:05 +0300988 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100989
Johannes Berg472dbc42008-09-11 00:01:49 +0200990 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
Johannes Berg64592c82010-06-10 10:21:31 +0200991 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100992
Johannes Berg472dbc42008-09-11 00:01:49 +0200993 else if (time_before(jiffies, ifmsh->last_preq)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100994 /* avoid long wait if did not send preqs for a long time
995 * and jiffies wrapped around
996 */
Johannes Berg472dbc42008-09-11 00:01:49 +0200997 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
Johannes Berg64592c82010-06-10 10:21:31 +0200998 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100999 } else
Johannes Berg472dbc42008-09-11 00:01:49 +02001000 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001001 min_preq_int_jiff(sdata));
1002}
1003
1004/**
1005 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
1006 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001007 * @sdata: local mesh subif
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001008 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001009void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001010{
Johannes Berg472dbc42008-09-11 00:01:49 +02001011 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001012 struct mesh_preq_queue *preq_node;
1013 struct mesh_path *mpath;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +08001014 u8 ttl, target_flags = 0;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +08001015 const u8 *da;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001016 u32 lifetime;
1017
Johannes Berga43816d2009-07-10 11:39:26 +02001018 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
Johannes Berg472dbc42008-09-11 00:01:49 +02001019 if (!ifmsh->preq_queue_len ||
1020 time_before(jiffies, ifmsh->last_preq +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001021 min_preq_int_jiff(sdata))) {
Johannes Berga43816d2009-07-10 11:39:26 +02001022 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001023 return;
1024 }
1025
Johannes Berg472dbc42008-09-11 00:01:49 +02001026 preq_node = list_first_entry(&ifmsh->preq_queue.list,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001027 struct mesh_preq_queue, list);
1028 list_del(&preq_node->list);
Johannes Berg472dbc42008-09-11 00:01:49 +02001029 --ifmsh->preq_queue_len;
Johannes Berga43816d2009-07-10 11:39:26 +02001030 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001031
1032 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001033 mpath = mesh_path_lookup(sdata, preq_node->dst);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001034 if (!mpath)
1035 goto enddiscovery;
1036
1037 spin_lock_bh(&mpath->state_lock);
Pedersen, Thomas5df20f22016-09-06 11:59:00 -07001038 if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) {
Bob Copeland74932952016-03-18 22:03:24 -04001039 spin_unlock_bh(&mpath->state_lock);
1040 goto enddiscovery;
1041 }
Javier Cardonaf3011cf2011-11-03 21:11:10 -07001042 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001043 if (preq_node->flags & PREQ_Q_F_START) {
1044 if (mpath->flags & MESH_PATH_RESOLVING) {
1045 spin_unlock_bh(&mpath->state_lock);
1046 goto enddiscovery;
1047 } else {
1048 mpath->flags &= ~MESH_PATH_RESOLVED;
1049 mpath->flags |= MESH_PATH_RESOLVING;
1050 mpath->discovery_retries = 0;
1051 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1052 }
1053 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1054 mpath->flags & MESH_PATH_RESOLVED) {
1055 mpath->flags &= ~MESH_PATH_RESOLVING;
1056 spin_unlock_bh(&mpath->state_lock);
1057 goto enddiscovery;
1058 }
1059
Johannes Berg472dbc42008-09-11 00:01:49 +02001060 ifmsh->last_preq = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001061
Rui Paulod19b3bf2009-11-09 23:46:55 +00001062 if (time_after(jiffies, ifmsh->last_sn_update +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001063 net_traversal_jiffies(sdata)) ||
Rui Paulod19b3bf2009-11-09 23:46:55 +00001064 time_before(jiffies, ifmsh->last_sn_update)) {
1065 ++ifmsh->sn;
1066 sdata->u.mesh.last_sn_update = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001067 }
1068 lifetime = default_lifetime(sdata);
Javier Cardona45904f22010-12-03 09:20:40 +01001069 ttl = sdata->u.mesh.mshcfg.element_ttl;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001070 if (ttl == 0) {
Johannes Berg472dbc42008-09-11 00:01:49 +02001071 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001072 spin_unlock_bh(&mpath->state_lock);
1073 goto enddiscovery;
1074 }
1075
1076 if (preq_node->flags & PREQ_Q_F_REFRESH)
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +08001077 target_flags |= IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001078 else
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +08001079 target_flags &= ~IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001080
1081 spin_unlock_bh(&mpath->state_lock);
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +08001082 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001083 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn,
1084 target_flags, mpath->dst, mpath->sn, da, 0,
1085 ttl, lifetime, 0, ifmsh->preq_id++, sdata);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001086 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1087
1088enddiscovery:
1089 rcu_read_unlock();
1090 kfree(preq_node);
1091}
1092
Ben Hutchings2c530402012-07-10 10:55:09 +00001093/**
1094 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001095 *
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001096 * @skb: 802.11 frame to be sent
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001097 * @sdata: network subif the frame will be sent through
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001098 *
Ben Hutchings2c530402012-07-10 10:55:09 +00001099 * Lookup next hop for given skb and start path discovery if no
1100 * forwarding information is found.
1101 *
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001102 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1103 * skb is freeed here if no mpath could be allocated.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001104 */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001105int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
1106 struct sk_buff *skb)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001107{
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001108 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001109 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1110 struct mesh_path *mpath;
1111 struct sk_buff *skb_to_free = NULL;
Rui Paulod19b3bf2009-11-09 23:46:55 +00001112 u8 *target_addr = hdr->addr3;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001113 int err = 0;
1114
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001115 /* Nulls are only sent to peers for PS and should be pre-addressed */
1116 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1117 return 0;
1118
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001119 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001120 err = mesh_nexthop_lookup(sdata, skb);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001121 if (!err)
1122 goto endlookup;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001123
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001124 /* no nexthop found, start resolving */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001125 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001126 if (!mpath) {
Bob Copelandae76eef2013-03-29 09:38:39 -04001127 mpath = mesh_path_add(sdata, target_addr);
1128 if (IS_ERR(mpath)) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01001129 mesh_path_discard_frame(sdata, skb);
Bob Copelandae76eef2013-03-29 09:38:39 -04001130 err = PTR_ERR(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001131 goto endlookup;
1132 }
1133 }
1134
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001135 if (!(mpath->flags & MESH_PATH_RESOLVING))
1136 mesh_queue_preq(mpath, PREQ_Q_F_START);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001137
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001138 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1139 skb_to_free = skb_dequeue(&mpath->frame_queue);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001140
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001141 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1142 ieee80211_set_qos_hdr(sdata, skb);
1143 skb_queue_tail(&mpath->frame_queue, skb);
1144 err = -ENOENT;
1145 if (skb_to_free)
Johannes Bergbf7cd942013-02-15 14:40:31 +01001146 mesh_path_discard_frame(sdata, skb_to_free);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001147
1148endlookup:
1149 rcu_read_unlock();
1150 return err;
1151}
Johannes Bergbf7cd942013-02-15 14:40:31 +01001152
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001153/**
1154 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1155 * this function is considered "using" the associated mpath, so preempt a path
1156 * refresh if this mpath expires soon.
1157 *
1158 * @skb: 802.11 frame to be sent
1159 * @sdata: network subif the frame will be sent through
1160 *
1161 * Returns: 0 if the next hop was found. Nonzero otherwise.
1162 */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001163int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
1164 struct sk_buff *skb)
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001165{
1166 struct mesh_path *mpath;
1167 struct sta_info *next_hop;
1168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1169 u8 *target_addr = hdr->addr3;
1170 int err = -ENOENT;
1171
1172 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001173 mpath = mesh_path_lookup(sdata, target_addr);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001174
1175 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
1176 goto endlookup;
1177
1178 if (time_after(jiffies,
1179 mpath->exp_time -
1180 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00001181 ether_addr_equal(sdata->vif.addr, hdr->addr4) &&
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001182 !(mpath->flags & MESH_PATH_RESOLVING) &&
1183 !(mpath->flags & MESH_PATH_FIXED))
1184 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1185
1186 next_hop = rcu_dereference(mpath->next_hop);
1187 if (next_hop) {
1188 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1189 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001190 ieee80211_mps_set_frame_flags(sdata, next_hop, hdr);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001191 err = 0;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001192 }
1193
1194endlookup:
1195 rcu_read_unlock();
1196 return err;
1197}
1198
1199void mesh_path_timer(unsigned long data)
1200{
Johannes Bergdea40962011-05-12 15:03:32 +02001201 struct mesh_path *mpath = (void *) data;
1202 struct ieee80211_sub_if_data *sdata = mpath->sdata;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001203 int ret;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001204
Johannes Bergdea40962011-05-12 15:03:32 +02001205 if (sdata->local->quiescing)
Johannes Berg5bb644a2009-05-17 11:40:42 +02001206 return;
Johannes Berg5bb644a2009-05-17 11:40:42 +02001207
1208 spin_lock_bh(&mpath->state_lock);
Luis Carlos Cobocfa22c72008-02-29 15:04:13 -08001209 if (mpath->flags & MESH_PATH_RESOLVED ||
Javier Cardona5ee68e52011-08-09 16:45:08 -07001210 (!(mpath->flags & MESH_PATH_RESOLVING))) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001211 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
Javier Cardona5ee68e52011-08-09 16:45:08 -07001212 spin_unlock_bh(&mpath->state_lock);
1213 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001214 ++mpath->discovery_retries;
1215 mpath->discovery_timeout *= 2;
Javier Cardonaf3011cf2011-11-03 21:11:10 -07001216 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001217 spin_unlock_bh(&mpath->state_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001218 mesh_queue_preq(mpath, 0);
1219 } else {
Jesse Jonesd8254712015-06-12 14:13:09 -07001220 mpath->flags &= ~(MESH_PATH_RESOLVING |
1221 MESH_PATH_RESOLVED |
1222 MESH_PATH_REQ_QUEUED);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001223 mpath->exp_time = jiffies;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001224 spin_unlock_bh(&mpath->state_lock);
1225 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1226 ret = mesh_path_send_to_gates(mpath);
1227 if (ret)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001228 mhwmp_dbg(sdata, "no gate was reachable\n");
Javier Cardona5ee68e52011-08-09 16:45:08 -07001229 } else
1230 mesh_path_flush_pending(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001231 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001232}
Rui Pauloe304bfd2009-11-09 23:46:56 +00001233
Johannes Bergbf7cd942013-02-15 14:40:31 +01001234void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
Rui Pauloe304bfd2009-11-09 23:46:56 +00001235{
1236 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Javier Cardona0507e152011-08-09 16:45:10 -07001237 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001238 u8 flags, target_flags = 0;
Rui Pauloe304bfd2009-11-09 23:46:56 +00001239
Javier Cardona16dd7262011-08-09 16:45:11 -07001240 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1241 ? RANN_FLAG_IS_GATE : 0;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001242
1243 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) {
1244 case IEEE80211_PROACTIVE_RANN:
1245 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001246 ++ifmsh->sn, 0, NULL, 0, broadcast_addr,
1247 0, ifmsh->mshcfg.element_ttl,
1248 interval, 0, 0, sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001249 break;
1250 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1251 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1252 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1253 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1254 target_flags |= IEEE80211_PREQ_TO_FLAG |
1255 IEEE80211_PREQ_USN_FLAG;
1256 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001257 ++ifmsh->sn, target_flags,
1258 (u8 *) broadcast_addr, 0, broadcast_addr,
1259 0, ifmsh->mshcfg.element_ttl, interval,
1260 0, ifmsh->preq_id++, sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001261 break;
1262 default:
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001263 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001264 return;
1265 }
Rui Pauloe304bfd2009-11-09 23:46:56 +00001266}