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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
19
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010020#define MAX_PREQ_QUEUE_LEN 64
21
Rui Paulo90a5e162009-11-11 00:01:31 +000022static void mesh_queue_preq(struct mesh_path *, u8);
23
Johannes Berg4a3cb702013-02-12 16:43:19 +010024static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae)
Luis Carlos Coboa00de5d2008-02-29 17:07:54 -080025{
26 if (ae)
27 offset += 6;
Harvey Harrisonae7245c2008-05-01 22:19:33 -070028 return get_unaligned_le32(preq_elem + offset);
Luis Carlos Coboa00de5d2008-02-29 17:07:54 -080029}
30
Bob Copelandaee64992014-04-15 10:43:06 -040031static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae)
Rui Paulod611f062009-11-09 23:46:50 +000032{
33 if (ae)
34 offset += 6;
35 return get_unaligned_le16(preq_elem + offset);
36}
37
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010038/* HWMP IE processing macros */
Luis Carlos Coboa00de5d2008-02-29 17:07:54 -080039#define AE_F (1<<6)
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)
Phil Carmody497888c2011-07-14 15:07:13 +030046#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))
Rui Paulod19b3bf2009-11-09 23:46:55 +000049#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)
Phil Carmody497888c2011-07-14 15:07:13 +030051#define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x))
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010052
53
Luis Carlos Coboa00de5d2008-02-29 17:07:54 -080054#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)
Thomas Pedersen25d49e42011-08-11 19:35:15 -070057#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))
Phil Carmody497888c2011-07-14 15:07:13 +030059#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))
Thomas Pedersen25d49e42011-08-11 19:35:15 -070061#define PREP_IE_TARGET_ADDR(x) (x + 3)
62#define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010063
Rui Paulod611f062009-11-09 23:46:50 +000064#define PERR_IE_TTL(x) (*(x))
Rui Paulod19b3bf2009-11-09 23:46:55 +000065#define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
66#define PERR_IE_TARGET_ADDR(x) (x + 3)
Phil Carmody497888c2011-07-14 15:07:13 +030067#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)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010069
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010070#define MSEC_TO_TU(x) (x*1000/1024)
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +080071#define SN_GT(x, y) ((s32)(y - x) < 0)
72#define SN_LT(x, y) ((s32)(x - y) < 0)
Jesse Jonesd8f03002015-06-12 15:38:07 -070073#define MAX_SANE_SN_DELTA 32
74
75static inline u32 SN_DELTA(u32 x, u32 y)
76{
77 return x >= y ? x - y : y - x;
78}
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010079
80#define net_traversal_jiffies(s) \
Johannes Berg472dbc42008-09-11 00:01:49 +020081 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010082#define default_lifetime(s) \
Johannes Berg472dbc42008-09-11 00:01:49 +020083 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010084#define min_preq_int_jiff(s) \
Johannes Berg472dbc42008-09-11 00:01:49 +020085 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
86#define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010087#define disc_timeout_jiff(s) \
Johannes Berg472dbc42008-09-11 00:01:49 +020088 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +080089#define root_path_confirmation_jiffies(s) \
90 msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010091
92enum mpath_frame_type {
93 MPATH_PREQ = 0,
94 MPATH_PREP,
Rui Paulo90a5e162009-11-11 00:01:31 +000095 MPATH_PERR,
96 MPATH_RANN
Luis Carlos Cobo050ac522008-02-23 15:17:15 +010097};
98
Johannes Berg15ff6362009-11-17 13:34:04 +010099static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
100
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100101static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800102 const u8 *orig_addr, u32 orig_sn,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100103 u8 target_flags, const u8 *target,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800104 u32 target_sn, const u8 *da,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100105 u8 hop_count, u8 ttl,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800106 u32 lifetime, u32 metric, u32 preq_id,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100107 struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100108{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200109 struct ieee80211_local *local = sdata->local;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700110 struct sk_buff *skb;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100111 struct ieee80211_mgmt *mgmt;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700112 u8 *pos, ie_len;
113 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
114 sizeof(mgmt->u.action.u.mesh_action);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100115
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800116 skb = dev_alloc_skb(local->tx_headroom +
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700117 hdr_len +
118 2 + 37); /* max HWMP IE */
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100119 if (!skb)
120 return -1;
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800121 skb_reserve(skb, local->tx_headroom);
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700122 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
123 memset(mgmt, 0, hdr_len);
Harvey Harrisone7827a72008-07-15 18:44:13 -0700124 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
125 IEEE80211_STYPE_ACTION);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100126
127 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100128 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Rui Paulo90a5e162009-11-11 00:01:31 +0000129 /* BSSID == SA */
Johannes Berg47846c92009-11-25 17:46:19 +0100130 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700131 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
132 mgmt->u.action.u.mesh_action.action_code =
133 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100134
135 switch (action) {
136 case MPATH_PREQ:
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200137 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100138 ie_len = 37;
139 pos = skb_put(skb, 2 + ie_len);
140 *pos++ = WLAN_EID_PREQ;
141 break;
142 case MPATH_PREP:
Chun-Yeow Yeoh0f716512013-04-03 17:49:53 +0800143 mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100144 ie_len = 31;
145 pos = skb_put(skb, 2 + ie_len);
146 *pos++ = WLAN_EID_PREP;
147 break;
Rui Paulo90a5e162009-11-11 00:01:31 +0000148 case MPATH_RANN:
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200149 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr);
Rui Paulo90a5e162009-11-11 00:01:31 +0000150 ie_len = sizeof(struct ieee80211_rann_ie);
151 pos = skb_put(skb, 2 + ie_len);
152 *pos++ = WLAN_EID_RANN;
153 break;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100154 default:
Patrick McHardy812714d2008-05-06 12:52:07 +0200155 kfree_skb(skb);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100156 return -ENOTSUPP;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100157 }
158 *pos++ = ie_len;
159 *pos++ = flags;
160 *pos++ = hop_count;
161 *pos++ = ttl;
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700162 if (action == MPATH_PREP) {
Rui Paulod19b3bf2009-11-09 23:46:55 +0000163 memcpy(pos, target, ETH_ALEN);
Rui Paulo90a5e162009-11-11 00:01:31 +0000164 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800165 put_unaligned_le32(target_sn, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700166 pos += 4;
167 } else {
168 if (action == MPATH_PREQ) {
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800169 put_unaligned_le32(preq_id, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700170 pos += 4;
171 }
172 memcpy(pos, orig_addr, ETH_ALEN);
173 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800174 put_unaligned_le32(orig_sn, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700175 pos += 4;
176 }
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800177 put_unaligned_le32(lifetime, pos); /* interval for RANN */
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700178 pos += 4;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800179 put_unaligned_le32(metric, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700180 pos += 4;
181 if (action == MPATH_PREQ) {
182 *pos++ = 1; /* destination count */
183 *pos++ = target_flags;
184 memcpy(pos, target, ETH_ALEN);
185 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800186 put_unaligned_le32(target_sn, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700187 pos += 4;
188 } else if (action == MPATH_PREP) {
189 memcpy(pos, orig_addr, ETH_ALEN);
190 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800191 put_unaligned_le32(orig_sn, pos);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700192 pos += 4;
Rui Paulo90a5e162009-11-11 00:01:31 +0000193 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100194
Johannes Berg62ae67b2009-11-18 18:42:05 +0100195 ieee80211_tx_skb(sdata, skb);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100196 return 0;
197}
198
Javier Cardona2cca3972011-09-06 12:10:43 -0700199
200/* Headroom is not adjusted. Caller should ensure that skb has sufficient
201 * headroom in case the frame is encrypted. */
202static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
203 struct sk_buff *skb)
204{
Javier Cardona2cca3972011-09-06 12:10:43 -0700205 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100206 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Javier Cardona2cca3972011-09-06 12:10:43 -0700207
Zhang Shengjud57a5442016-03-03 01:16:56 +0000208 skb_reset_mac_header(skb);
209 skb_reset_network_header(skb);
210 skb_reset_transport_header(skb);
Javier Cardona2cca3972011-09-06 12:10:43 -0700211
212 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
213 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
214 skb->priority = 7;
215
216 info->control.vif = &sdata->vif;
Bob Copeland9cbbffe2013-01-09 12:34:55 -0500217 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
Javier Cardona2154c812011-09-07 17:49:53 -0700218 ieee80211_set_qos_hdr(sdata, skb);
Marco Porsch3f52b7e2013-01-30 18:14:08 +0100219 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
Javier Cardona2cca3972011-09-06 12:10:43 -0700220}
221
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100222/**
Bob Copeland75ea7192013-01-03 00:09:46 -0500223 * mesh_path_error_tx - Sends a PERR mesh management frame
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100224 *
Bob Copeland75ea7192013-01-03 00:09:46 -0500225 * @ttl: allowed remaining hops
Rui Paulod19b3bf2009-11-09 23:46:55 +0000226 * @target: broken destination
227 * @target_sn: SN of the broken destination
228 * @target_rcode: reason code for this PERR
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100229 * @ra: node this frame is addressed to
Bob Copeland75ea7192013-01-03 00:09:46 -0500230 * @sdata: local mesh subif
Javier Cardona2cca3972011-09-06 12:10:43 -0700231 *
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.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100235 */
Johannes Bergbf7cd942013-02-15 14:40:31 +0100236int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800237 u8 ttl, const u8 *target, u32 target_sn,
238 u16 target_rcode, const u8 *ra)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100239{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200240 struct ieee80211_local *local = sdata->local;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700241 struct sk_buff *skb;
Thomas Pedersendca7e942011-11-24 17:15:24 -0800242 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100243 struct ieee80211_mgmt *mgmt;
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700244 u8 *pos, ie_len;
245 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
246 sizeof(mgmt->u.action.u.mesh_action);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100247
Thomas Pedersendca7e942011-11-24 17:15:24 -0800248 if (time_before(jiffies, ifmsh->next_perr))
249 return -EAGAIN;
250
Javier Cardona65e8b0c2012-01-17 18:17:46 -0800251 skb = dev_alloc_skb(local->tx_headroom +
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200252 sdata->encrypt_headroom +
Bob Copeland86804512013-01-09 12:34:56 -0500253 IEEE80211_ENCRYPT_TAILROOM +
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700254 hdr_len +
255 2 + 15 /* PERR IE */);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100256 if (!skb)
257 return -1;
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200258 skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom);
Thomas Pedersen3b69a9c2011-10-26 14:47:25 -0700259 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
260 memset(mgmt, 0, hdr_len);
Harvey Harrisone7827a72008-07-15 18:44:13 -0700261 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
262 IEEE80211_STYPE_ACTION);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100263
264 memcpy(mgmt->da, ra, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100265 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Thomas Pedersen25d49e42011-08-11 19:35:15 -0700266 /* BSSID == SA */
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;
Rui Paulod611f062009-11-09 23:46:50 +0000271 ie_len = 15;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100272 pos = skb_put(skb, 2 + ie_len);
273 *pos++ = WLAN_EID_PERR;
274 *pos++ = ie_len;
Rui Paulod611f062009-11-09 23:46:50 +0000275 /* ttl */
Javier Cardona45904f22010-12-03 09:20:40 +0100276 *pos++ = ttl;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100277 /* number of destinations */
278 *pos++ = 1;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800279 /* Flags field has AE bit only as defined in
280 * sec 8.4.2.117 IEEE802.11-2012
Rui Paulod611f062009-11-09 23:46:50 +0000281 */
282 *pos = 0;
Rui Paulod611f062009-11-09 23:46:50 +0000283 pos++;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000284 memcpy(pos, target, ETH_ALEN);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100285 pos += ETH_ALEN;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800286 put_unaligned_le32(target_sn, pos);
Rui Paulod611f062009-11-09 23:46:50 +0000287 pos += 4;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800288 put_unaligned_le16(target_rcode, pos);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100289
Javier Cardona2cca3972011-09-06 12:10:43 -0700290 /* see note in function header */
291 prepare_frame_for_deferred_tx(sdata, skb);
Thomas Pedersendca7e942011-11-24 17:15:24 -0800292 ifmsh->next_perr = TU_TO_EXP_TIME(
293 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval);
Javier Cardona2cca3972011-09-06 12:10:43 -0700294 ieee80211_add_pending_skb(local, skb);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100295 return 0;
296}
297
Javier Cardonabfc32e62009-08-17 17:15:55 -0700298void ieee80211s_update_metric(struct ieee80211_local *local,
Javier Cardona35b3fe1c2012-06-08 13:30:25 -0700299 struct sta_info *sta, struct sk_buff *skb)
Javier Cardonabfc32e62009-08-17 17:15:55 -0700300{
301 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
302 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
303 int failed;
304
305 if (!ieee80211_is_data(hdr->frame_control))
306 return;
307
308 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
309
310 /* moving average, scaled to 100 */
Johannes Berga76d5e02015-06-18 16:20:08 +0200311 sta->mesh->fail_avg =
312 ((80 * sta->mesh->fail_avg + 5) / 100 + 20 * failed);
313 if (sta->mesh->fail_avg > 95)
Javier Cardona35b3fe1c2012-06-08 13:30:25 -0700314 mesh_plink_broken(sta);
Javier Cardonabfc32e62009-08-17 17:15:55 -0700315}
316
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100317static u32 airtime_link_metric_get(struct ieee80211_local *local,
318 struct sta_info *sta)
319{
Thomas Pedersen6b62bf32012-03-05 15:31:48 -0800320 struct rate_info rinfo;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100321 /* 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;
325 int rate, err;
326 u32 tx_time, estimated_retx;
327 u64 result;
328
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300329 /* 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
333 */
334 rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 100);
Johannes Berge6a98542008-10-21 12:40:02 +0200335
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300336 if (rate) {
337 err = 0;
338 } else {
339 if (sta->mesh->fail_avg >= 100)
340 return MAX_METRIC;
Johannes Berge6a98542008-10-21 12:40:02 +0200341
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300342 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
343 rate = cfg80211_calculate_bitrate(&rinfo);
344 if (WARN_ON(!rate))
345 return MAX_METRIC;
346
347 err = (sta->mesh->fail_avg << ARITH_SHIFT) / 100;
348 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100349
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.
352 */
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100353 tx_time = (device_constant + 10 * test_frame_len / rate);
354 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
Maxim Altshul3b17fbf2016-07-11 17:15:24 +0300355 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100356 return (u32)result;
357}
358
359/**
360 * hwmp_route_info_get - Update routing info to originator and transmitter
361 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200362 * @sdata: local mesh subif
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100363 * @mgmt: mesh management frame
364 * @hwmp_ie: hwmp information element (PREP or PREQ)
Bob Copeland75ea7192013-01-03 00:09:46 -0500365 * @action: type of hwmp ie
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100366 *
367 * This function updates the path routing information to the originator and the
Andrey Yurovskyf99288d2009-10-20 12:17:34 -0700368 * transmitter of a HWMP PREQ or PREP frame.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100369 *
370 * Returns: metric to frame originator or 0 if the frame should not be further
371 * processed
372 *
373 * Notes: this function is the only place (besides user-provided info) where
374 * path routing information is updated.
375 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200376static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100377 struct ieee80211_mgmt *mgmt,
378 const u8 *hwmp_ie, enum mpath_frame_type action)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100379{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200380 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100381 struct mesh_path *mpath;
382 struct sta_info *sta;
383 bool fresh_info;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100384 const u8 *orig_addr, *ta;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000385 u32 orig_sn, orig_metric;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100386 unsigned long orig_lifetime, exp_time;
387 u32 last_hop_metric, new_metric;
388 bool process = true;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100389
390 rcu_read_lock();
Johannes Bergabe60632009-11-25 17:46:18 +0100391 sta = sta_info_get(sdata, mgmt->sa);
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100392 if (!sta) {
393 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100394 return 0;
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100395 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100396
397 last_hop_metric = airtime_link_metric_get(local, sta);
398 /* Update and check originator routing info */
399 fresh_info = true;
400
401 switch (action) {
402 case MPATH_PREQ:
403 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000404 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100405 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
406 orig_metric = PREQ_IE_METRIC(hwmp_ie);
407 break;
408 case MPATH_PREP:
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800409 /* Originator here refers to the MP that was the target in the
410 * Path Request. We divert from the nomenclature in the draft
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100411 * so that we can easily use a single function to gather path
412 * information from both PREQ and PREP frames.
413 */
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800414 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
415 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100416 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
417 orig_metric = PREP_IE_METRIC(hwmp_ie);
418 break;
419 default:
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100420 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100421 return 0;
422 }
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);
427
Joe Perchesb203ca32012-05-08 18:56:52 +0000428 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100429 /* This MP is the originator, we are not interested in this
430 * frame, except for updating transmitter's path info.
431 */
432 process = false;
433 fresh_info = false;
434 } else {
Johannes Bergbf7cd942013-02-15 14:40:31 +0100435 mpath = mesh_path_lookup(sdata, orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100436 if (mpath) {
437 spin_lock_bh(&mpath->state_lock);
438 if (mpath->flags & MESH_PATH_FIXED)
439 fresh_info = false;
440 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
Rui Paulod19b3bf2009-11-09 23:46:55 +0000441 (mpath->flags & MESH_PATH_SN_VALID)) {
442 if (SN_GT(mpath->sn, orig_sn) ||
443 (mpath->sn == orig_sn &&
Porsch, Marco533866b2010-02-24 09:53:13 +0100444 new_metric >= mpath->metric)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100445 process = false;
446 fresh_info = false;
447 }
Jesse Jonesd8f03002015-06-12 15:38:07 -0700448 } else if (!(mpath->flags & MESH_PATH_ACTIVE)) {
449 bool have_sn, newer_sn, bounced;
450
451 have_sn = mpath->flags & MESH_PATH_SN_VALID;
452 newer_sn = have_sn && SN_GT(orig_sn, mpath->sn);
453 bounced = have_sn &&
454 (SN_DELTA(orig_sn, mpath->sn) >
455 MAX_SANE_SN_DELTA);
456
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 */;
464 } else {
465 process = false;
466 fresh_info = false;
467 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100468 }
469 } else {
Bob Copelandae76eef2013-03-29 09:38:39 -0400470 mpath = mesh_path_add(sdata, orig_addr);
471 if (IS_ERR(mpath)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100472 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100473 return 0;
474 }
475 spin_lock_bh(&mpath->state_lock);
476 }
477
478 if (fresh_info) {
479 mesh_path_assign_nexthop(mpath, sta);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000480 mpath->flags |= MESH_PATH_SN_VALID;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100481 mpath->metric = new_metric;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000482 mpath->sn = orig_sn;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100483 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
490 */
491 } else
492 spin_unlock_bh(&mpath->state_lock);
493 }
494
495 /* Update and check transmitter routing info */
496 ta = mgmt->sa;
Joe Perchesb203ca32012-05-08 18:56:52 +0000497 if (ether_addr_equal(orig_addr, ta))
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100498 fresh_info = false;
499 else {
500 fresh_info = true;
501
Johannes Bergbf7cd942013-02-15 14:40:31 +0100502 mpath = mesh_path_lookup(sdata, ta);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100503 if (mpath) {
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)))
508 fresh_info = false;
509 } else {
Bob Copelandae76eef2013-03-29 09:38:39 -0400510 mpath = mesh_path_add(sdata, ta);
511 if (IS_ERR(mpath)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100512 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100513 return 0;
514 }
515 spin_lock_bh(&mpath->state_lock);
516 }
517
518 if (fresh_info) {
519 mesh_path_assign_nexthop(mpath, sta);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100520 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);
526 } else
527 spin_unlock_bh(&mpath->state_lock);
528 }
529
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100530 rcu_read_unlock();
531
532 return process ? new_metric : 0;
533}
534
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200535static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100536 struct ieee80211_mgmt *mgmt,
Alexis Green5ec596c2015-06-09 16:20:24 -0700537 const u8 *preq_elem, u32 orig_metric)
David Woo57ef5dd2009-08-12 11:03:43 -0700538{
Johannes Berg472dbc42008-09-11 00:01:49 +0200539 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800540 struct mesh_path *mpath = NULL;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100541 const u8 *target_addr, *orig_addr;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800542 const u8 *da;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800543 u8 target_flags, ttl, flags;
Jeff Mahoneyb4201cc2016-04-04 14:15:23 -0400544 u32 orig_sn, target_sn, lifetime, target_metric = 0;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100545 bool reply = false;
546 bool forward = true;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800547 bool root_is_gate;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100548
Rui Paulod19b3bf2009-11-09 23:46:55 +0000549 /* Update target SN, if present */
550 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100551 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000552 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);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800555 /* Proactive PREQ gate announcements */
556 flags = PREQ_IE_FLAGS(preq_elem);
557 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100558
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200559 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
Rui Paulo27db2e42009-11-09 23:46:45 +0000560
Joe Perchesb203ca32012-05-08 18:56:52 +0000561 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200562 mhwmp_dbg(sdata, "PREQ is for us\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100563 forward = false;
564 reply = true;
Alexis Green5ec596c2015-06-09 16:20:24 -0700565 target_metric = 0;
Yuan-Chi Pang7c10ec12018-08-29 09:30:08 +0800566
567 if (SN_GT(target_sn, ifmsh->sn))
568 ifmsh->sn = target_sn;
569
Rui Paulod19b3bf2009-11-09 23:46:55 +0000570 if (time_after(jiffies, ifmsh->last_sn_update +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100571 net_traversal_jiffies(sdata)) ||
Rui Paulod19b3bf2009-11-09 23:46:55 +0000572 time_before(jiffies, ifmsh->last_sn_update)) {
Bob Copelandbc3ce0b2014-04-15 10:43:08 -0400573 ++ifmsh->sn;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000574 ifmsh->last_sn_update = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100575 }
Bob Copelandbc3ce0b2014-04-15 10:43:08 -0400576 target_sn = ifmsh->sn;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800577 } else if (is_broadcast_ether_addr(target_addr) &&
578 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
579 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100580 mpath = mesh_path_lookup(sdata, orig_addr);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800581 if (mpath) {
582 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
583 reply = true;
584 target_addr = sdata->vif.addr;
585 target_sn = ++ifmsh->sn;
Alexis Green5ec596c2015-06-09 16:20:24 -0700586 target_metric = 0;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800587 ifmsh->last_sn_update = jiffies;
588 }
589 if (root_is_gate)
590 mesh_path_add_gate(mpath);
591 }
592 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100593 } else {
594 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100595 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100596 if (mpath) {
Rui Paulod19b3bf2009-11-09 23:46:55 +0000597 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
598 SN_LT(mpath->sn, target_sn)) {
599 mpath->sn = target_sn;
600 mpath->flags |= MESH_PATH_SN_VALID;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800601 } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) &&
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100602 (mpath->flags & MESH_PATH_ACTIVE)) {
603 reply = true;
Alexis Green5ec596c2015-06-09 16:20:24 -0700604 target_metric = mpath->metric;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000605 target_sn = mpath->sn;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800606 /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/
607 target_flags |= IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100608 }
609 }
610 rcu_read_unlock();
611 }
612
613 if (reply) {
614 lifetime = PREQ_IE_LIFETIME(preq_elem);
Javier Cardona45904f22010-12-03 09:20:40 +0100615 ttl = ifmsh->mshcfg.element_ttl;
Rui Paulo27db2e42009-11-09 23:46:45 +0000616 if (ttl != 0) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200617 mhwmp_dbg(sdata, "replying to the PREQ\n");
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800618 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800619 orig_sn, 0, target_addr,
620 target_sn, mgmt->sa, 0, ttl,
Alexis Green5ec596c2015-06-09 16:20:24 -0700621 lifetime, target_metric, 0,
622 sdata);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800623 } else {
Johannes Berg472dbc42008-09-11 00:01:49 +0200624 ifmsh->mshstats.dropped_frames_ttl++;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800625 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100626 }
627
Chun-Yeow Yeoh94f90652012-01-21 01:02:16 +0800628 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100629 u32 preq_id;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800630 u8 hopcount;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100631
632 ttl = PREQ_IE_TTL(preq_elem);
633 lifetime = PREQ_IE_LIFETIME(preq_elem);
634 if (ttl <= 1) {
Johannes Berg472dbc42008-09-11 00:01:49 +0200635 ifmsh->mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100636 return;
637 }
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200638 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100639 --ttl;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100640 preq_id = PREQ_IE_PREQ_ID(preq_elem);
641 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800642 da = (mpath && mpath->is_root) ?
643 mpath->rann_snd_addr : broadcast_addr;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800644
645 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
646 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
647 target_sn = PREQ_IE_TARGET_SN(preq_elem);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800648 }
649
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100650 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800651 orig_sn, target_flags, target_addr,
652 target_sn, da, hopcount, ttl, lifetime,
Alexis Green5ec596c2015-06-09 16:20:24 -0700653 orig_metric, preq_id, sdata);
Chun-Yeow Yeoh7d4e15b2012-05-04 14:57:50 +0800654 if (!is_multicast_ether_addr(da))
655 ifmsh->mshstats.fwded_unicast++;
656 else
657 ifmsh->mshstats.fwded_mcast++;
Johannes Berg472dbc42008-09-11 00:01:49 +0200658 ifmsh->mshstats.fwded_frames++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100659 }
660}
661
662
Johannes Berg40b275b2011-05-13 14:15:49 +0200663static inline struct sta_info *
664next_hop_deref_protected(struct mesh_path *mpath)
665{
666 return rcu_dereference_protected(mpath->next_hop,
667 lockdep_is_held(&mpath->state_lock));
668}
669
670
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200671static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100672 struct ieee80211_mgmt *mgmt,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100673 const u8 *prep_elem, u32 metric)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100674{
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800675 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100676 struct mesh_path *mpath;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100677 const u8 *target_addr, *orig_addr;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100678 u8 ttl, hopcount, flags;
679 u8 next_hop[ETH_ALEN];
Rui Paulod19b3bf2009-11-09 23:46:55 +0000680 u32 target_sn, orig_sn, lifetime;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100681
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200682 mhwmp_dbg(sdata, "received PREP from %pM\n",
Chun-Yeow Yeoh0f716512013-04-03 17:49:53 +0800683 PREP_IE_TARGET_ADDR(prep_elem));
Rui Paulodbb81c42009-11-09 23:46:46 +0000684
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800685 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
Joe Perchesb203ca32012-05-08 18:56:52 +0000686 if (ether_addr_equal(orig_addr, sdata->vif.addr))
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100687 /* destination, no forwarding required */
688 return;
689
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800690 if (!ifmsh->mshcfg.dot11MeshForwarding)
691 return;
692
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100693 ttl = PREP_IE_TTL(prep_elem);
694 if (ttl <= 1) {
Johannes Berg472dbc42008-09-11 00:01:49 +0200695 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100696 return;
697 }
698
699 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100700 mpath = mesh_path_lookup(sdata, orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100701 if (mpath)
702 spin_lock_bh(&mpath->state_lock);
703 else
704 goto fail;
705 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
706 spin_unlock_bh(&mpath->state_lock);
707 goto fail;
708 }
Johannes Berg40b275b2011-05-13 14:15:49 +0200709 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100710 spin_unlock_bh(&mpath->state_lock);
711 --ttl;
712 flags = PREP_IE_FLAGS(prep_elem);
713 lifetime = PREP_IE_LIFETIME(prep_elem);
714 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800715 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000716 target_sn = PREP_IE_TARGET_SN(prep_elem);
717 orig_sn = PREP_IE_ORIG_SN(prep_elem);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100718
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800719 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0,
720 target_addr, target_sn, next_hop, hopcount,
721 ttl, lifetime, metric, 0, sdata);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100722 rcu_read_unlock();
Daniel Walkerc8a61a72009-08-18 10:59:00 -0700723
724 sdata->u.mesh.mshstats.fwded_unicast++;
Johannes Berg472dbc42008-09-11 00:01:49 +0200725 sdata->u.mesh.mshstats.fwded_frames++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100726 return;
727
728fail:
729 rcu_read_unlock();
Johannes Berg472dbc42008-09-11 00:01:49 +0200730 sdata->u.mesh.mshstats.dropped_frames_no_route++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100731}
732
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200733static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100734 struct ieee80211_mgmt *mgmt,
735 const u8 *perr_elem)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100736{
Rui Paulod611f062009-11-09 23:46:50 +0000737 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100738 struct mesh_path *mpath;
Rui Paulod611f062009-11-09 23:46:50 +0000739 u8 ttl;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100740 const u8 *ta, *target_addr;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000741 u32 target_sn;
742 u16 target_rcode;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100743
744 ta = mgmt->sa;
Rui Paulod611f062009-11-09 23:46:50 +0000745 ttl = PERR_IE_TTL(perr_elem);
746 if (ttl <= 1) {
747 ifmsh->mshstats.dropped_frames_ttl++;
748 return;
749 }
750 ttl--;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000751 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
752 target_sn = PERR_IE_TARGET_SN(perr_elem);
753 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
Rui Paulod611f062009-11-09 23:46:50 +0000754
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100755 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100756 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100757 if (mpath) {
Felix Fietkau888d04d2012-03-01 15:22:09 +0100758 struct sta_info *sta;
759
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100760 spin_lock_bh(&mpath->state_lock);
Felix Fietkau888d04d2012-03-01 15:22:09 +0100761 sta = next_hop_deref_protected(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100762 if (mpath->flags & MESH_PATH_ACTIVE &&
Joe Perchesb203ca32012-05-08 18:56:52 +0000763 ether_addr_equal(ta, sta->sta.addr) &&
Pedersen, Thomas5df20f22016-09-06 11:59:00 -0700764 !(mpath->flags & MESH_PATH_FIXED) &&
Rui Paulod19b3bf2009-11-09 23:46:55 +0000765 (!(mpath->flags & MESH_PATH_SN_VALID) ||
Alexis Green703ee732015-06-10 11:02:09 -0700766 SN_GT(target_sn, mpath->sn) || target_sn == 0)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100767 mpath->flags &= ~MESH_PATH_ACTIVE;
Alexis Green703ee732015-06-10 11:02:09 -0700768 if (target_sn != 0)
769 mpath->sn = target_sn;
770 else
771 mpath->sn += 1;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100772 spin_unlock_bh(&mpath->state_lock);
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800773 if (!ifmsh->mshcfg.dot11MeshForwarding)
774 goto endperr;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100775 mesh_path_error_tx(sdata, ttl, target_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800776 target_sn, target_rcode,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100777 broadcast_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100778 } else
779 spin_unlock_bh(&mpath->state_lock);
780 }
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800781endperr:
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100782 rcu_read_unlock();
783}
784
Rui Paulo90a5e162009-11-11 00:01:31 +0000785static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100786 struct ieee80211_mgmt *mgmt,
787 const struct ieee80211_rann_ie *rann)
Rui Paulo90a5e162009-11-11 00:01:31 +0000788{
789 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800790 struct ieee80211_local *local = sdata->local;
791 struct sta_info *sta;
Rui Paulo90a5e162009-11-11 00:01:31 +0000792 struct mesh_path *mpath;
Rui Paulo90a5e162009-11-11 00:01:31 +0000793 u8 ttl, flags, hopcount;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100794 const u8 *orig_addr;
Chun-Yeow Yeoh030d4672017-11-14 23:20:05 +0800795 u32 orig_sn, new_metric, orig_metric, last_hop_metric, interval;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700796 bool root_is_gate;
Rui Paulo90a5e162009-11-11 00:01:31 +0000797
Rui Paulo90a5e162009-11-11 00:01:31 +0000798 ttl = rann->rann_ttl;
Rui Paulo90a5e162009-11-11 00:01:31 +0000799 flags = rann->rann_flags;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700800 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
Rui Paulo90a5e162009-11-11 00:01:31 +0000801 orig_addr = rann->rann_addr;
Chun-Yeow Yeoh292c41a2012-03-19 21:38:46 +0800802 orig_sn = le32_to_cpu(rann->rann_seq);
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800803 interval = le32_to_cpu(rann->rann_interval);
Rui Paulo90a5e162009-11-11 00:01:31 +0000804 hopcount = rann->rann_hopcount;
Rui Pauloa6a58b42009-11-09 23:46:51 +0000805 hopcount++;
Chun-Yeow Yeoh030d4672017-11-14 23:20:05 +0800806 orig_metric = le32_to_cpu(rann->rann_metric);
Javier Cardona5ee68e52011-08-09 16:45:08 -0700807
808 /* Ignore our own RANNs */
Joe Perchesb203ca32012-05-08 18:56:52 +0000809 if (ether_addr_equal(orig_addr, sdata->vif.addr))
Javier Cardona5ee68e52011-08-09 16:45:08 -0700810 return;
811
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200812 mhwmp_dbg(sdata,
813 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
814 orig_addr, mgmt->sa, root_is_gate);
Rui Paulo90a5e162009-11-11 00:01:31 +0000815
816 rcu_read_lock();
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800817 sta = sta_info_get(sdata, mgmt->sa);
818 if (!sta) {
819 rcu_read_unlock();
820 return;
821 }
822
Chun-Yeow Yeoh030d4672017-11-14 23:20:05 +0800823 last_hop_metric = airtime_link_metric_get(local, sta);
824 new_metric = orig_metric + last_hop_metric;
825 if (new_metric < orig_metric)
826 new_metric = MAX_METRIC;
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800827
Johannes Bergbf7cd942013-02-15 14:40:31 +0100828 mpath = mesh_path_lookup(sdata, orig_addr);
Rui Paulo90a5e162009-11-11 00:01:31 +0000829 if (!mpath) {
Bob Copelandae76eef2013-03-29 09:38:39 -0400830 mpath = mesh_path_add(sdata, orig_addr);
831 if (IS_ERR(mpath)) {
Rui Paulo90a5e162009-11-11 00:01:31 +0000832 rcu_read_unlock();
833 sdata->u.mesh.mshstats.dropped_frames_no_route++;
834 return;
835 }
Rui Paulo90a5e162009-11-11 00:01:31 +0000836 }
Javier Cardona5ee68e52011-08-09 16:45:08 -0700837
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800838 if (!(SN_LT(mpath->sn, orig_sn)) &&
Chun-Yeow Yeoh030d4672017-11-14 23:20:05 +0800839 !(mpath->sn == orig_sn && new_metric < mpath->rann_metric)) {
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800840 rcu_read_unlock();
841 return;
842 }
843
Javier Cardona5ee68e52011-08-09 16:45:08 -0700844 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +0800845 (time_after(jiffies, mpath->last_preq_to_root +
846 root_path_confirmation_jiffies(sdata)) ||
847 time_before(jiffies, mpath->last_preq_to_root))) &&
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800848 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200849 mhwmp_dbg(sdata,
850 "time to refresh root mpath %pM\n",
851 orig_addr);
Javier Cardona5ee68e52011-08-09 16:45:08 -0700852 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +0800853 mpath->last_preq_to_root = jiffies;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700854 }
855
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800856 mpath->sn = orig_sn;
Chun-Yeow Yeoh030d4672017-11-14 23:20:05 +0800857 mpath->rann_metric = new_metric;
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800858 mpath->is_root = true;
859 /* Recording RANNs sender address to send individually
860 * addressed PREQs destined for root mesh STA */
861 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
862
863 if (root_is_gate)
864 mesh_path_add_gate(mpath);
865
866 if (ttl <= 1) {
867 ifmsh->mshstats.dropped_frames_ttl++;
868 rcu_read_unlock();
869 return;
870 }
871 ttl--;
872
873 if (ifmsh->mshcfg.dot11MeshForwarding) {
Rui Paulo90a5e162009-11-11 00:01:31 +0000874 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800875 orig_sn, 0, NULL, 0, broadcast_addr,
876 hopcount, ttl, interval,
Chun-Yeow Yeoh030d4672017-11-14 23:20:05 +0800877 new_metric, 0, sdata);
Rui Paulo90a5e162009-11-11 00:01:31 +0000878 }
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800879
Rui Paulo90a5e162009-11-11 00:01:31 +0000880 rcu_read_unlock();
881}
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100882
883
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200884void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100885 struct ieee80211_mgmt *mgmt, size_t len)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100886{
887 struct ieee802_11_elems elems;
888 size_t baselen;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700889 u32 path_metric;
Javier Cardona97091312011-10-06 14:54:22 -0700890 struct sta_info *sta;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100891
Johannes Berg9c80d3d2008-09-08 15:41:59 +0200892 /* need action_code */
893 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
894 return;
895
Javier Cardona97091312011-10-06 14:54:22 -0700896 rcu_read_lock();
897 sta = sta_info_get(sdata, mgmt->sa);
Johannes Berg433f5bc2015-06-17 10:31:00 +0200898 if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
Javier Cardona97091312011-10-06 14:54:22 -0700899 rcu_read_unlock();
900 return;
901 }
902 rcu_read_unlock();
903
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100904 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
905 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
Johannes Bergb2e506b2013-03-26 14:54:16 +0100906 len - baselen, false, &elems);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100907
Rui Paulodbb81c42009-11-09 23:46:46 +0000908 if (elems.preq) {
909 if (elems.preq_len != 37)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100910 /* Right now we support just 1 destination and no AE */
911 return;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700912 path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
913 MPATH_PREQ);
914 if (path_metric)
Rui Paulodbb81c42009-11-09 23:46:46 +0000915 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
Alexis Greenafd2efb2015-06-05 12:43:54 -0700916 path_metric);
Rui Paulodbb81c42009-11-09 23:46:46 +0000917 }
918 if (elems.prep) {
919 if (elems.prep_len != 31)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100920 /* Right now we support no AE */
921 return;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700922 path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
923 MPATH_PREP);
924 if (path_metric)
Rui Paulodbb81c42009-11-09 23:46:46 +0000925 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
Alexis Greenafd2efb2015-06-05 12:43:54 -0700926 path_metric);
Rui Paulodbb81c42009-11-09 23:46:46 +0000927 }
928 if (elems.perr) {
Rui Paulod611f062009-11-09 23:46:50 +0000929 if (elems.perr_len != 15)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100930 /* Right now we support only one destination per PERR */
931 return;
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200932 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100933 }
Rui Paulo90a5e162009-11-11 00:01:31 +0000934 if (elems.rann)
935 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100936}
937
938/**
939 * mesh_queue_preq - queue a PREQ to a given destination
940 *
941 * @mpath: mesh path to discover
942 * @flags: special attributes of the PREQ to be sent
943 *
944 * Locking: the function must be called from within a rcu read lock block.
945 *
946 */
947static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
948{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200949 struct ieee80211_sub_if_data *sdata = mpath->sdata;
Johannes Berg472dbc42008-09-11 00:01:49 +0200950 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100951 struct mesh_preq_queue *preq_node;
952
Andrey Yurovsky59615b52009-06-25 16:07:42 -0700953 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100954 if (!preq_node) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200955 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100956 return;
957 }
958
Baruch Siach987dafa2011-07-28 08:51:05 +0300959 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
Johannes Berg472dbc42008-09-11 00:01:49 +0200960 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
Baruch Siach987dafa2011-07-28 08:51:05 +0300961 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100962 kfree(preq_node);
963 if (printk_ratelimit())
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200964 mhwmp_dbg(sdata, "PREQ node queue full\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100965 return;
966 }
967
Johannes Bergf2dc7982011-11-18 15:27:31 +0100968 spin_lock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700969 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
Johannes Bergf2dc7982011-11-18 15:27:31 +0100970 spin_unlock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700971 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Dan Carpenter88d53462011-11-15 09:33:31 +0300972 kfree(preq_node);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700973 return;
974 }
975
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100976 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
977 preq_node->flags = flags;
978
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700979 mpath->flags |= MESH_PATH_REQ_QUEUED;
Johannes Bergf2dc7982011-11-18 15:27:31 +0100980 spin_unlock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700981
Johannes Berg472dbc42008-09-11 00:01:49 +0200982 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
983 ++ifmsh->preq_queue_len;
Baruch Siach987dafa2011-07-28 08:51:05 +0300984 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100985
Johannes Berg472dbc42008-09-11 00:01:49 +0200986 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
Johannes Berg64592c82010-06-10 10:21:31 +0200987 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100988
Johannes Berg472dbc42008-09-11 00:01:49 +0200989 else if (time_before(jiffies, ifmsh->last_preq)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100990 /* avoid long wait if did not send preqs for a long time
991 * and jiffies wrapped around
992 */
Johannes Berg472dbc42008-09-11 00:01:49 +0200993 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
Johannes Berg64592c82010-06-10 10:21:31 +0200994 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100995 } else
Johannes Berg472dbc42008-09-11 00:01:49 +0200996 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100997 min_preq_int_jiff(sdata));
998}
999
1000/**
1001 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
1002 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001003 * @sdata: local mesh subif
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001004 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001005void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001006{
Johannes Berg472dbc42008-09-11 00:01:49 +02001007 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001008 struct mesh_preq_queue *preq_node;
1009 struct mesh_path *mpath;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +08001010 u8 ttl, target_flags = 0;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +08001011 const u8 *da;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001012 u32 lifetime;
1013
Johannes Berga43816d2009-07-10 11:39:26 +02001014 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
Johannes Berg472dbc42008-09-11 00:01:49 +02001015 if (!ifmsh->preq_queue_len ||
1016 time_before(jiffies, ifmsh->last_preq +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001017 min_preq_int_jiff(sdata))) {
Johannes Berga43816d2009-07-10 11:39:26 +02001018 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001019 return;
1020 }
1021
Johannes Berg472dbc42008-09-11 00:01:49 +02001022 preq_node = list_first_entry(&ifmsh->preq_queue.list,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001023 struct mesh_preq_queue, list);
1024 list_del(&preq_node->list);
Johannes Berg472dbc42008-09-11 00:01:49 +02001025 --ifmsh->preq_queue_len;
Johannes Berga43816d2009-07-10 11:39:26 +02001026 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001027
1028 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001029 mpath = mesh_path_lookup(sdata, preq_node->dst);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001030 if (!mpath)
1031 goto enddiscovery;
1032
1033 spin_lock_bh(&mpath->state_lock);
Pedersen, Thomas5df20f22016-09-06 11:59:00 -07001034 if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) {
Bob Copeland74932952016-03-18 22:03:24 -04001035 spin_unlock_bh(&mpath->state_lock);
1036 goto enddiscovery;
1037 }
Javier Cardonaf3011cf2011-11-03 21:11:10 -07001038 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001039 if (preq_node->flags & PREQ_Q_F_START) {
1040 if (mpath->flags & MESH_PATH_RESOLVING) {
1041 spin_unlock_bh(&mpath->state_lock);
1042 goto enddiscovery;
1043 } else {
1044 mpath->flags &= ~MESH_PATH_RESOLVED;
1045 mpath->flags |= MESH_PATH_RESOLVING;
1046 mpath->discovery_retries = 0;
1047 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1048 }
1049 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1050 mpath->flags & MESH_PATH_RESOLVED) {
1051 mpath->flags &= ~MESH_PATH_RESOLVING;
1052 spin_unlock_bh(&mpath->state_lock);
1053 goto enddiscovery;
1054 }
1055
Johannes Berg472dbc42008-09-11 00:01:49 +02001056 ifmsh->last_preq = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001057
Rui Paulod19b3bf2009-11-09 23:46:55 +00001058 if (time_after(jiffies, ifmsh->last_sn_update +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001059 net_traversal_jiffies(sdata)) ||
Rui Paulod19b3bf2009-11-09 23:46:55 +00001060 time_before(jiffies, ifmsh->last_sn_update)) {
1061 ++ifmsh->sn;
1062 sdata->u.mesh.last_sn_update = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001063 }
1064 lifetime = default_lifetime(sdata);
Javier Cardona45904f22010-12-03 09:20:40 +01001065 ttl = sdata->u.mesh.mshcfg.element_ttl;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001066 if (ttl == 0) {
Johannes Berg472dbc42008-09-11 00:01:49 +02001067 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001068 spin_unlock_bh(&mpath->state_lock);
1069 goto enddiscovery;
1070 }
1071
1072 if (preq_node->flags & PREQ_Q_F_REFRESH)
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +08001073 target_flags |= IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001074 else
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +08001075 target_flags &= ~IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001076
1077 spin_unlock_bh(&mpath->state_lock);
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +08001078 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001079 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn,
1080 target_flags, mpath->dst, mpath->sn, da, 0,
1081 ttl, lifetime, 0, ifmsh->preq_id++, sdata);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001082 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1083
1084enddiscovery:
1085 rcu_read_unlock();
1086 kfree(preq_node);
1087}
1088
Ben Hutchings2c530402012-07-10 10:55:09 +00001089/**
1090 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001091 *
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001092 * @skb: 802.11 frame to be sent
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001093 * @sdata: network subif the frame will be sent through
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001094 *
Ben Hutchings2c530402012-07-10 10:55:09 +00001095 * Lookup next hop for given skb and start path discovery if no
1096 * forwarding information is found.
1097 *
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001098 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1099 * skb is freeed here if no mpath could be allocated.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001100 */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001101int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
1102 struct sk_buff *skb)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001103{
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001104 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001105 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1106 struct mesh_path *mpath;
1107 struct sk_buff *skb_to_free = NULL;
Rui Paulod19b3bf2009-11-09 23:46:55 +00001108 u8 *target_addr = hdr->addr3;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001109 int err = 0;
1110
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001111 /* Nulls are only sent to peers for PS and should be pre-addressed */
1112 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1113 return 0;
1114
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001115 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001116 err = mesh_nexthop_lookup(sdata, skb);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001117 if (!err)
1118 goto endlookup;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001119
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001120 /* no nexthop found, start resolving */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001121 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001122 if (!mpath) {
Bob Copelandae76eef2013-03-29 09:38:39 -04001123 mpath = mesh_path_add(sdata, target_addr);
1124 if (IS_ERR(mpath)) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01001125 mesh_path_discard_frame(sdata, skb);
Bob Copelandae76eef2013-03-29 09:38:39 -04001126 err = PTR_ERR(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001127 goto endlookup;
1128 }
1129 }
1130
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001131 if (!(mpath->flags & MESH_PATH_RESOLVING))
1132 mesh_queue_preq(mpath, PREQ_Q_F_START);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001133
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001134 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1135 skb_to_free = skb_dequeue(&mpath->frame_queue);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001136
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001137 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1138 ieee80211_set_qos_hdr(sdata, skb);
1139 skb_queue_tail(&mpath->frame_queue, skb);
1140 err = -ENOENT;
1141 if (skb_to_free)
Johannes Bergbf7cd942013-02-15 14:40:31 +01001142 mesh_path_discard_frame(sdata, skb_to_free);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001143
1144endlookup:
1145 rcu_read_unlock();
1146 return err;
1147}
Johannes Bergbf7cd942013-02-15 14:40:31 +01001148
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001149/**
1150 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1151 * this function is considered "using" the associated mpath, so preempt a path
1152 * refresh if this mpath expires soon.
1153 *
1154 * @skb: 802.11 frame to be sent
1155 * @sdata: network subif the frame will be sent through
1156 *
1157 * Returns: 0 if the next hop was found. Nonzero otherwise.
1158 */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001159int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
1160 struct sk_buff *skb)
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001161{
1162 struct mesh_path *mpath;
1163 struct sta_info *next_hop;
1164 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1165 u8 *target_addr = hdr->addr3;
1166 int err = -ENOENT;
1167
1168 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001169 mpath = mesh_path_lookup(sdata, target_addr);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001170
1171 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
1172 goto endlookup;
1173
1174 if (time_after(jiffies,
1175 mpath->exp_time -
1176 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00001177 ether_addr_equal(sdata->vif.addr, hdr->addr4) &&
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001178 !(mpath->flags & MESH_PATH_RESOLVING) &&
1179 !(mpath->flags & MESH_PATH_FIXED))
1180 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1181
1182 next_hop = rcu_dereference(mpath->next_hop);
1183 if (next_hop) {
1184 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1185 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001186 ieee80211_mps_set_frame_flags(sdata, next_hop, hdr);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001187 err = 0;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001188 }
1189
1190endlookup:
1191 rcu_read_unlock();
1192 return err;
1193}
1194
1195void mesh_path_timer(unsigned long data)
1196{
Johannes Bergdea40962011-05-12 15:03:32 +02001197 struct mesh_path *mpath = (void *) data;
1198 struct ieee80211_sub_if_data *sdata = mpath->sdata;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001199 int ret;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001200
Johannes Bergdea40962011-05-12 15:03:32 +02001201 if (sdata->local->quiescing)
Johannes Berg5bb644a2009-05-17 11:40:42 +02001202 return;
Johannes Berg5bb644a2009-05-17 11:40:42 +02001203
1204 spin_lock_bh(&mpath->state_lock);
Luis Carlos Cobocfa22c72008-02-29 15:04:13 -08001205 if (mpath->flags & MESH_PATH_RESOLVED ||
Javier Cardona5ee68e52011-08-09 16:45:08 -07001206 (!(mpath->flags & MESH_PATH_RESOLVING))) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001207 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
Javier Cardona5ee68e52011-08-09 16:45:08 -07001208 spin_unlock_bh(&mpath->state_lock);
1209 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001210 ++mpath->discovery_retries;
1211 mpath->discovery_timeout *= 2;
Javier Cardonaf3011cf2011-11-03 21:11:10 -07001212 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001213 spin_unlock_bh(&mpath->state_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001214 mesh_queue_preq(mpath, 0);
1215 } else {
Jesse Jonesd8254712015-06-12 14:13:09 -07001216 mpath->flags &= ~(MESH_PATH_RESOLVING |
1217 MESH_PATH_RESOLVED |
1218 MESH_PATH_REQ_QUEUED);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001219 mpath->exp_time = jiffies;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001220 spin_unlock_bh(&mpath->state_lock);
1221 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1222 ret = mesh_path_send_to_gates(mpath);
1223 if (ret)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001224 mhwmp_dbg(sdata, "no gate was reachable\n");
Javier Cardona5ee68e52011-08-09 16:45:08 -07001225 } else
1226 mesh_path_flush_pending(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001227 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001228}
Rui Pauloe304bfd2009-11-09 23:46:56 +00001229
Johannes Bergbf7cd942013-02-15 14:40:31 +01001230void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
Rui Pauloe304bfd2009-11-09 23:46:56 +00001231{
1232 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Javier Cardona0507e152011-08-09 16:45:10 -07001233 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001234 u8 flags, target_flags = 0;
Rui Pauloe304bfd2009-11-09 23:46:56 +00001235
Javier Cardona16dd7262011-08-09 16:45:11 -07001236 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1237 ? RANN_FLAG_IS_GATE : 0;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001238
1239 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) {
1240 case IEEE80211_PROACTIVE_RANN:
1241 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001242 ++ifmsh->sn, 0, NULL, 0, broadcast_addr,
1243 0, ifmsh->mshcfg.element_ttl,
1244 interval, 0, 0, sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001245 break;
1246 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1247 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1248 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1249 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1250 target_flags |= IEEE80211_PREQ_TO_FLAG |
1251 IEEE80211_PREQ_USN_FLAG;
1252 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001253 ++ifmsh->sn, target_flags,
1254 (u8 *) broadcast_addr, 0, broadcast_addr,
1255 0, ifmsh->mshcfg.element_ttl, interval,
1256 0, ifmsh->preq_id++, sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001257 break;
1258 default:
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001259 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001260 return;
1261 }
Rui Pauloe304bfd2009-11-09 23:46:56 +00001262}