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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
Johannes Berga76d5e02015-06-18 16:20:08 +0200329 if (sta->mesh->fail_avg >= 100)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100330 return MAX_METRIC;
Johannes Berge6a98542008-10-21 12:40:02 +0200331
Johannes Berge5a9f8d2015-10-16 17:54:47 +0200332 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
Thomas Pedersen6b62bf32012-03-05 15:31:48 -0800333 rate = cfg80211_calculate_bitrate(&rinfo);
334 if (WARN_ON(!rate))
Johannes Berge6a98542008-10-21 12:40:02 +0200335 return MAX_METRIC;
336
Johannes Berga76d5e02015-06-18 16:20:08 +0200337 err = (sta->mesh->fail_avg << ARITH_SHIFT) / 100;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100338
339 /* bitrate is in units of 100 Kbps, while we need rate in units of
340 * 1Mbps. This will be corrected on tx_time computation.
341 */
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100342 tx_time = (device_constant + 10 * test_frame_len / rate);
343 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
344 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
345 return (u32)result;
346}
347
348/**
349 * hwmp_route_info_get - Update routing info to originator and transmitter
350 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200351 * @sdata: local mesh subif
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100352 * @mgmt: mesh management frame
353 * @hwmp_ie: hwmp information element (PREP or PREQ)
Bob Copeland75ea7192013-01-03 00:09:46 -0500354 * @action: type of hwmp ie
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100355 *
356 * This function updates the path routing information to the originator and the
Andrey Yurovskyf99288d2009-10-20 12:17:34 -0700357 * transmitter of a HWMP PREQ or PREP frame.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100358 *
359 * Returns: metric to frame originator or 0 if the frame should not be further
360 * processed
361 *
362 * Notes: this function is the only place (besides user-provided info) where
363 * path routing information is updated.
364 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200365static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100366 struct ieee80211_mgmt *mgmt,
367 const u8 *hwmp_ie, enum mpath_frame_type action)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100368{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200369 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100370 struct mesh_path *mpath;
371 struct sta_info *sta;
372 bool fresh_info;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100373 const u8 *orig_addr, *ta;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000374 u32 orig_sn, orig_metric;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100375 unsigned long orig_lifetime, exp_time;
376 u32 last_hop_metric, new_metric;
377 bool process = true;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100378
379 rcu_read_lock();
Johannes Bergabe60632009-11-25 17:46:18 +0100380 sta = sta_info_get(sdata, mgmt->sa);
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100381 if (!sta) {
382 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100383 return 0;
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100384 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100385
386 last_hop_metric = airtime_link_metric_get(local, sta);
387 /* Update and check originator routing info */
388 fresh_info = true;
389
390 switch (action) {
391 case MPATH_PREQ:
392 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000393 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100394 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
395 orig_metric = PREQ_IE_METRIC(hwmp_ie);
396 break;
397 case MPATH_PREP:
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800398 /* Originator here refers to the MP that was the target in the
399 * Path Request. We divert from the nomenclature in the draft
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100400 * so that we can easily use a single function to gather path
401 * information from both PREQ and PREP frames.
402 */
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800403 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
404 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100405 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
406 orig_metric = PREP_IE_METRIC(hwmp_ie);
407 break;
408 default:
Johannes Bergdc0b0f72008-02-23 15:17:20 +0100409 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100410 return 0;
411 }
412 new_metric = orig_metric + last_hop_metric;
413 if (new_metric < orig_metric)
414 new_metric = MAX_METRIC;
415 exp_time = TU_TO_EXP_TIME(orig_lifetime);
416
Joe Perchesb203ca32012-05-08 18:56:52 +0000417 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100418 /* This MP is the originator, we are not interested in this
419 * frame, except for updating transmitter's path info.
420 */
421 process = false;
422 fresh_info = false;
423 } else {
Johannes Bergbf7cd942013-02-15 14:40:31 +0100424 mpath = mesh_path_lookup(sdata, orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100425 if (mpath) {
426 spin_lock_bh(&mpath->state_lock);
427 if (mpath->flags & MESH_PATH_FIXED)
428 fresh_info = false;
429 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
Rui Paulod19b3bf2009-11-09 23:46:55 +0000430 (mpath->flags & MESH_PATH_SN_VALID)) {
431 if (SN_GT(mpath->sn, orig_sn) ||
432 (mpath->sn == orig_sn &&
Porsch, Marco533866b2010-02-24 09:53:13 +0100433 new_metric >= mpath->metric)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100434 process = false;
435 fresh_info = false;
436 }
Jesse Jonesd8f03002015-06-12 15:38:07 -0700437 } else if (!(mpath->flags & MESH_PATH_ACTIVE)) {
438 bool have_sn, newer_sn, bounced;
439
440 have_sn = mpath->flags & MESH_PATH_SN_VALID;
441 newer_sn = have_sn && SN_GT(orig_sn, mpath->sn);
442 bounced = have_sn &&
443 (SN_DELTA(orig_sn, mpath->sn) >
444 MAX_SANE_SN_DELTA);
445
446 if (!have_sn || newer_sn) {
447 /* if SN is newer than what we had
448 * then we can take it */;
449 } else if (bounced) {
450 /* if SN is way different than what
451 * we had then assume the other side
452 * rebooted or restarted */;
453 } else {
454 process = false;
455 fresh_info = false;
456 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100457 }
458 } else {
Bob Copelandae76eef2013-03-29 09:38:39 -0400459 mpath = mesh_path_add(sdata, orig_addr);
460 if (IS_ERR(mpath)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100461 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100462 return 0;
463 }
464 spin_lock_bh(&mpath->state_lock);
465 }
466
467 if (fresh_info) {
468 mesh_path_assign_nexthop(mpath, sta);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000469 mpath->flags |= MESH_PATH_SN_VALID;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100470 mpath->metric = new_metric;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000471 mpath->sn = orig_sn;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100472 mpath->exp_time = time_after(mpath->exp_time, exp_time)
473 ? mpath->exp_time : exp_time;
474 mesh_path_activate(mpath);
475 spin_unlock_bh(&mpath->state_lock);
476 mesh_path_tx_pending(mpath);
477 /* draft says preq_id should be saved to, but there does
478 * not seem to be any use for it, skipping by now
479 */
480 } else
481 spin_unlock_bh(&mpath->state_lock);
482 }
483
484 /* Update and check transmitter routing info */
485 ta = mgmt->sa;
Joe Perchesb203ca32012-05-08 18:56:52 +0000486 if (ether_addr_equal(orig_addr, ta))
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100487 fresh_info = false;
488 else {
489 fresh_info = true;
490
Johannes Bergbf7cd942013-02-15 14:40:31 +0100491 mpath = mesh_path_lookup(sdata, ta);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100492 if (mpath) {
493 spin_lock_bh(&mpath->state_lock);
494 if ((mpath->flags & MESH_PATH_FIXED) ||
495 ((mpath->flags & MESH_PATH_ACTIVE) &&
496 (last_hop_metric > mpath->metric)))
497 fresh_info = false;
498 } else {
Bob Copelandae76eef2013-03-29 09:38:39 -0400499 mpath = mesh_path_add(sdata, ta);
500 if (IS_ERR(mpath)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100501 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100502 return 0;
503 }
504 spin_lock_bh(&mpath->state_lock);
505 }
506
507 if (fresh_info) {
508 mesh_path_assign_nexthop(mpath, sta);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100509 mpath->metric = last_hop_metric;
510 mpath->exp_time = time_after(mpath->exp_time, exp_time)
511 ? mpath->exp_time : exp_time;
512 mesh_path_activate(mpath);
513 spin_unlock_bh(&mpath->state_lock);
514 mesh_path_tx_pending(mpath);
515 } else
516 spin_unlock_bh(&mpath->state_lock);
517 }
518
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100519 rcu_read_unlock();
520
521 return process ? new_metric : 0;
522}
523
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200524static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100525 struct ieee80211_mgmt *mgmt,
Alexis Green5ec596c2015-06-09 16:20:24 -0700526 const u8 *preq_elem, u32 orig_metric)
David Woo57ef5dd2009-08-12 11:03:43 -0700527{
Johannes Berg472dbc42008-09-11 00:01:49 +0200528 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800529 struct mesh_path *mpath = NULL;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100530 const u8 *target_addr, *orig_addr;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800531 const u8 *da;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800532 u8 target_flags, ttl, flags;
Jeff Mahoneyb4201cc2016-04-04 14:15:23 -0400533 u32 orig_sn, target_sn, lifetime, target_metric = 0;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100534 bool reply = false;
535 bool forward = true;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800536 bool root_is_gate;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100537
Rui Paulod19b3bf2009-11-09 23:46:55 +0000538 /* Update target SN, if present */
539 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100540 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000541 target_sn = PREQ_IE_TARGET_SN(preq_elem);
542 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
543 target_flags = PREQ_IE_TARGET_F(preq_elem);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800544 /* Proactive PREQ gate announcements */
545 flags = PREQ_IE_FLAGS(preq_elem);
546 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100547
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200548 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
Rui Paulo27db2e42009-11-09 23:46:45 +0000549
Joe Perchesb203ca32012-05-08 18:56:52 +0000550 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200551 mhwmp_dbg(sdata, "PREQ is for us\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100552 forward = false;
553 reply = true;
Alexis Green5ec596c2015-06-09 16:20:24 -0700554 target_metric = 0;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000555 if (time_after(jiffies, ifmsh->last_sn_update +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100556 net_traversal_jiffies(sdata)) ||
Rui Paulod19b3bf2009-11-09 23:46:55 +0000557 time_before(jiffies, ifmsh->last_sn_update)) {
Bob Copelandbc3ce0b2014-04-15 10:43:08 -0400558 ++ifmsh->sn;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000559 ifmsh->last_sn_update = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100560 }
Bob Copelandbc3ce0b2014-04-15 10:43:08 -0400561 target_sn = ifmsh->sn;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800562 } else if (is_broadcast_ether_addr(target_addr) &&
563 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
564 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100565 mpath = mesh_path_lookup(sdata, orig_addr);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800566 if (mpath) {
567 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
568 reply = true;
569 target_addr = sdata->vif.addr;
570 target_sn = ++ifmsh->sn;
Alexis Green5ec596c2015-06-09 16:20:24 -0700571 target_metric = 0;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800572 ifmsh->last_sn_update = jiffies;
573 }
574 if (root_is_gate)
575 mesh_path_add_gate(mpath);
576 }
577 rcu_read_unlock();
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100578 } else {
579 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100580 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100581 if (mpath) {
Rui Paulod19b3bf2009-11-09 23:46:55 +0000582 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
583 SN_LT(mpath->sn, target_sn)) {
584 mpath->sn = target_sn;
585 mpath->flags |= MESH_PATH_SN_VALID;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800586 } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) &&
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100587 (mpath->flags & MESH_PATH_ACTIVE)) {
588 reply = true;
Alexis Green5ec596c2015-06-09 16:20:24 -0700589 target_metric = mpath->metric;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000590 target_sn = mpath->sn;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800591 /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/
592 target_flags |= IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100593 }
594 }
595 rcu_read_unlock();
596 }
597
598 if (reply) {
599 lifetime = PREQ_IE_LIFETIME(preq_elem);
Javier Cardona45904f22010-12-03 09:20:40 +0100600 ttl = ifmsh->mshcfg.element_ttl;
Rui Paulo27db2e42009-11-09 23:46:45 +0000601 if (ttl != 0) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200602 mhwmp_dbg(sdata, "replying to the PREQ\n");
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800603 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800604 orig_sn, 0, target_addr,
605 target_sn, mgmt->sa, 0, ttl,
Alexis Green5ec596c2015-06-09 16:20:24 -0700606 lifetime, target_metric, 0,
607 sdata);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800608 } else {
Johannes Berg472dbc42008-09-11 00:01:49 +0200609 ifmsh->mshstats.dropped_frames_ttl++;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800610 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100611 }
612
Chun-Yeow Yeoh94f90652012-01-21 01:02:16 +0800613 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100614 u32 preq_id;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800615 u8 hopcount;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100616
617 ttl = PREQ_IE_TTL(preq_elem);
618 lifetime = PREQ_IE_LIFETIME(preq_elem);
619 if (ttl <= 1) {
Johannes Berg472dbc42008-09-11 00:01:49 +0200620 ifmsh->mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100621 return;
622 }
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200623 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100624 --ttl;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100625 preq_id = PREQ_IE_PREQ_ID(preq_elem);
626 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800627 da = (mpath && mpath->is_root) ?
628 mpath->rann_snd_addr : broadcast_addr;
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800629
630 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
631 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
632 target_sn = PREQ_IE_TARGET_SN(preq_elem);
Chun-Yeow Yeoh3fbf4b71b2012-06-17 02:27:40 +0800633 }
634
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100635 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800636 orig_sn, target_flags, target_addr,
637 target_sn, da, hopcount, ttl, lifetime,
Alexis Green5ec596c2015-06-09 16:20:24 -0700638 orig_metric, preq_id, sdata);
Chun-Yeow Yeoh7d4e15b2012-05-04 14:57:50 +0800639 if (!is_multicast_ether_addr(da))
640 ifmsh->mshstats.fwded_unicast++;
641 else
642 ifmsh->mshstats.fwded_mcast++;
Johannes Berg472dbc42008-09-11 00:01:49 +0200643 ifmsh->mshstats.fwded_frames++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100644 }
645}
646
647
Johannes Berg40b275b2011-05-13 14:15:49 +0200648static inline struct sta_info *
649next_hop_deref_protected(struct mesh_path *mpath)
650{
651 return rcu_dereference_protected(mpath->next_hop,
652 lockdep_is_held(&mpath->state_lock));
653}
654
655
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200656static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100657 struct ieee80211_mgmt *mgmt,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100658 const u8 *prep_elem, u32 metric)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100659{
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800660 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100661 struct mesh_path *mpath;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100662 const u8 *target_addr, *orig_addr;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100663 u8 ttl, hopcount, flags;
664 u8 next_hop[ETH_ALEN];
Rui Paulod19b3bf2009-11-09 23:46:55 +0000665 u32 target_sn, orig_sn, lifetime;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100666
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200667 mhwmp_dbg(sdata, "received PREP from %pM\n",
Chun-Yeow Yeoh0f716512013-04-03 17:49:53 +0800668 PREP_IE_TARGET_ADDR(prep_elem));
Rui Paulodbb81c42009-11-09 23:46:46 +0000669
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800670 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
Joe Perchesb203ca32012-05-08 18:56:52 +0000671 if (ether_addr_equal(orig_addr, sdata->vif.addr))
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100672 /* destination, no forwarding required */
673 return;
674
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800675 if (!ifmsh->mshcfg.dot11MeshForwarding)
676 return;
677
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100678 ttl = PREP_IE_TTL(prep_elem);
679 if (ttl <= 1) {
Johannes Berg472dbc42008-09-11 00:01:49 +0200680 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100681 return;
682 }
683
684 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100685 mpath = mesh_path_lookup(sdata, orig_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100686 if (mpath)
687 spin_lock_bh(&mpath->state_lock);
688 else
689 goto fail;
690 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
691 spin_unlock_bh(&mpath->state_lock);
692 goto fail;
693 }
Johannes Berg40b275b2011-05-13 14:15:49 +0200694 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100695 spin_unlock_bh(&mpath->state_lock);
696 --ttl;
697 flags = PREP_IE_FLAGS(prep_elem);
698 lifetime = PREP_IE_LIFETIME(prep_elem);
699 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
Thomas Pedersen3c26f1f2011-11-24 17:15:22 -0800700 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
Rui Paulod19b3bf2009-11-09 23:46:55 +0000701 target_sn = PREP_IE_TARGET_SN(prep_elem);
702 orig_sn = PREP_IE_ORIG_SN(prep_elem);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100703
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800704 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0,
705 target_addr, target_sn, next_hop, hopcount,
706 ttl, lifetime, metric, 0, sdata);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100707 rcu_read_unlock();
Daniel Walkerc8a61a72009-08-18 10:59:00 -0700708
709 sdata->u.mesh.mshstats.fwded_unicast++;
Johannes Berg472dbc42008-09-11 00:01:49 +0200710 sdata->u.mesh.mshstats.fwded_frames++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100711 return;
712
713fail:
714 rcu_read_unlock();
Johannes Berg472dbc42008-09-11 00:01:49 +0200715 sdata->u.mesh.mshstats.dropped_frames_no_route++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100716}
717
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200718static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100719 struct ieee80211_mgmt *mgmt,
720 const u8 *perr_elem)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100721{
Rui Paulod611f062009-11-09 23:46:50 +0000722 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100723 struct mesh_path *mpath;
Rui Paulod611f062009-11-09 23:46:50 +0000724 u8 ttl;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100725 const u8 *ta, *target_addr;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000726 u32 target_sn;
727 u16 target_rcode;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100728
729 ta = mgmt->sa;
Rui Paulod611f062009-11-09 23:46:50 +0000730 ttl = PERR_IE_TTL(perr_elem);
731 if (ttl <= 1) {
732 ifmsh->mshstats.dropped_frames_ttl++;
733 return;
734 }
735 ttl--;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000736 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
737 target_sn = PERR_IE_TARGET_SN(perr_elem);
738 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
Rui Paulod611f062009-11-09 23:46:50 +0000739
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100740 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +0100741 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100742 if (mpath) {
Felix Fietkau888d04d2012-03-01 15:22:09 +0100743 struct sta_info *sta;
744
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100745 spin_lock_bh(&mpath->state_lock);
Felix Fietkau888d04d2012-03-01 15:22:09 +0100746 sta = next_hop_deref_protected(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100747 if (mpath->flags & MESH_PATH_ACTIVE &&
Joe Perchesb203ca32012-05-08 18:56:52 +0000748 ether_addr_equal(ta, sta->sta.addr) &&
Rui Paulod19b3bf2009-11-09 23:46:55 +0000749 (!(mpath->flags & MESH_PATH_SN_VALID) ||
Alexis Green703ee732015-06-10 11:02:09 -0700750 SN_GT(target_sn, mpath->sn) || target_sn == 0)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100751 mpath->flags &= ~MESH_PATH_ACTIVE;
Alexis Green703ee732015-06-10 11:02:09 -0700752 if (target_sn != 0)
753 mpath->sn = target_sn;
754 else
755 mpath->sn += 1;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100756 spin_unlock_bh(&mpath->state_lock);
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800757 if (!ifmsh->mshcfg.dot11MeshForwarding)
758 goto endperr;
Johannes Bergbf7cd942013-02-15 14:40:31 +0100759 mesh_path_error_tx(sdata, ttl, target_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800760 target_sn, target_rcode,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100761 broadcast_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100762 } else
763 spin_unlock_bh(&mpath->state_lock);
764 }
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +0800765endperr:
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100766 rcu_read_unlock();
767}
768
Rui Paulo90a5e162009-11-11 00:01:31 +0000769static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
Johannes Berg4a3cb702013-02-12 16:43:19 +0100770 struct ieee80211_mgmt *mgmt,
771 const struct ieee80211_rann_ie *rann)
Rui Paulo90a5e162009-11-11 00:01:31 +0000772{
773 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800774 struct ieee80211_local *local = sdata->local;
775 struct sta_info *sta;
Rui Paulo90a5e162009-11-11 00:01:31 +0000776 struct mesh_path *mpath;
Rui Paulo90a5e162009-11-11 00:01:31 +0000777 u8 ttl, flags, hopcount;
Johannes Berg4a3cb702013-02-12 16:43:19 +0100778 const u8 *orig_addr;
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800779 u32 orig_sn, metric, metric_txsta, interval;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700780 bool root_is_gate;
Rui Paulo90a5e162009-11-11 00:01:31 +0000781
Rui Paulo90a5e162009-11-11 00:01:31 +0000782 ttl = rann->rann_ttl;
Rui Paulo90a5e162009-11-11 00:01:31 +0000783 flags = rann->rann_flags;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700784 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
Rui Paulo90a5e162009-11-11 00:01:31 +0000785 orig_addr = rann->rann_addr;
Chun-Yeow Yeoh292c41a2012-03-19 21:38:46 +0800786 orig_sn = le32_to_cpu(rann->rann_seq);
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800787 interval = le32_to_cpu(rann->rann_interval);
Rui Paulo90a5e162009-11-11 00:01:31 +0000788 hopcount = rann->rann_hopcount;
Rui Pauloa6a58b42009-11-09 23:46:51 +0000789 hopcount++;
Chun-Yeow Yeoh292c41a2012-03-19 21:38:46 +0800790 metric = le32_to_cpu(rann->rann_metric);
Javier Cardona5ee68e52011-08-09 16:45:08 -0700791
792 /* Ignore our own RANNs */
Joe Perchesb203ca32012-05-08 18:56:52 +0000793 if (ether_addr_equal(orig_addr, sdata->vif.addr))
Javier Cardona5ee68e52011-08-09 16:45:08 -0700794 return;
795
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200796 mhwmp_dbg(sdata,
797 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
798 orig_addr, mgmt->sa, root_is_gate);
Rui Paulo90a5e162009-11-11 00:01:31 +0000799
800 rcu_read_lock();
Chun-Yeow Yeohd2a079f2012-03-23 18:48:51 +0800801 sta = sta_info_get(sdata, mgmt->sa);
802 if (!sta) {
803 rcu_read_unlock();
804 return;
805 }
806
807 metric_txsta = airtime_link_metric_get(local, sta);
808
Johannes Bergbf7cd942013-02-15 14:40:31 +0100809 mpath = mesh_path_lookup(sdata, orig_addr);
Rui Paulo90a5e162009-11-11 00:01:31 +0000810 if (!mpath) {
Bob Copelandae76eef2013-03-29 09:38:39 -0400811 mpath = mesh_path_add(sdata, orig_addr);
812 if (IS_ERR(mpath)) {
Rui Paulo90a5e162009-11-11 00:01:31 +0000813 rcu_read_unlock();
814 sdata->u.mesh.mshstats.dropped_frames_no_route++;
815 return;
816 }
Rui Paulo90a5e162009-11-11 00:01:31 +0000817 }
Javier Cardona5ee68e52011-08-09 16:45:08 -0700818
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800819 if (!(SN_LT(mpath->sn, orig_sn)) &&
820 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) {
821 rcu_read_unlock();
822 return;
823 }
824
Javier Cardona5ee68e52011-08-09 16:45:08 -0700825 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +0800826 (time_after(jiffies, mpath->last_preq_to_root +
827 root_path_confirmation_jiffies(sdata)) ||
828 time_before(jiffies, mpath->last_preq_to_root))) &&
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800829 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200830 mhwmp_dbg(sdata,
831 "time to refresh root mpath %pM\n",
832 orig_addr);
Javier Cardona5ee68e52011-08-09 16:45:08 -0700833 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
Chun-Yeow Yeoh728b19e2012-06-14 02:06:10 +0800834 mpath->last_preq_to_root = jiffies;
Javier Cardona5ee68e52011-08-09 16:45:08 -0700835 }
836
Chun-Yeow Yeoh7ebfa462012-06-15 10:20:02 +0800837 mpath->sn = orig_sn;
838 mpath->rann_metric = metric + metric_txsta;
839 mpath->is_root = true;
840 /* Recording RANNs sender address to send individually
841 * addressed PREQs destined for root mesh STA */
842 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
843
844 if (root_is_gate)
845 mesh_path_add_gate(mpath);
846
847 if (ttl <= 1) {
848 ifmsh->mshstats.dropped_frames_ttl++;
849 rcu_read_unlock();
850 return;
851 }
852 ttl--;
853
854 if (ifmsh->mshcfg.dot11MeshForwarding) {
Rui Paulo90a5e162009-11-11 00:01:31 +0000855 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +0800856 orig_sn, 0, NULL, 0, broadcast_addr,
857 hopcount, ttl, interval,
858 metric + metric_txsta, 0, sdata);
Rui Paulo90a5e162009-11-11 00:01:31 +0000859 }
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800860
Rui Paulo90a5e162009-11-11 00:01:31 +0000861 rcu_read_unlock();
862}
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100863
864
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200865void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
Johannes Bergbf7cd942013-02-15 14:40:31 +0100866 struct ieee80211_mgmt *mgmt, size_t len)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100867{
868 struct ieee802_11_elems elems;
869 size_t baselen;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700870 u32 path_metric;
Javier Cardona97091312011-10-06 14:54:22 -0700871 struct sta_info *sta;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100872
Johannes Berg9c80d3d2008-09-08 15:41:59 +0200873 /* need action_code */
874 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
875 return;
876
Javier Cardona97091312011-10-06 14:54:22 -0700877 rcu_read_lock();
878 sta = sta_info_get(sdata, mgmt->sa);
Johannes Berg433f5bc2015-06-17 10:31:00 +0200879 if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
Javier Cardona97091312011-10-06 14:54:22 -0700880 rcu_read_unlock();
881 return;
882 }
883 rcu_read_unlock();
884
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100885 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
886 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
Johannes Bergb2e506b2013-03-26 14:54:16 +0100887 len - baselen, false, &elems);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100888
Rui Paulodbb81c42009-11-09 23:46:46 +0000889 if (elems.preq) {
890 if (elems.preq_len != 37)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100891 /* Right now we support just 1 destination and no AE */
892 return;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700893 path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
894 MPATH_PREQ);
895 if (path_metric)
Rui Paulodbb81c42009-11-09 23:46:46 +0000896 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
Alexis Greenafd2efb2015-06-05 12:43:54 -0700897 path_metric);
Rui Paulodbb81c42009-11-09 23:46:46 +0000898 }
899 if (elems.prep) {
900 if (elems.prep_len != 31)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100901 /* Right now we support no AE */
902 return;
Alexis Greenafd2efb2015-06-05 12:43:54 -0700903 path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
904 MPATH_PREP);
905 if (path_metric)
Rui Paulodbb81c42009-11-09 23:46:46 +0000906 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
Alexis Greenafd2efb2015-06-05 12:43:54 -0700907 path_metric);
Rui Paulodbb81c42009-11-09 23:46:46 +0000908 }
909 if (elems.perr) {
Rui Paulod611f062009-11-09 23:46:50 +0000910 if (elems.perr_len != 15)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100911 /* Right now we support only one destination per PERR */
912 return;
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200913 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100914 }
Rui Paulo90a5e162009-11-11 00:01:31 +0000915 if (elems.rann)
916 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100917}
918
919/**
920 * mesh_queue_preq - queue a PREQ to a given destination
921 *
922 * @mpath: mesh path to discover
923 * @flags: special attributes of the PREQ to be sent
924 *
925 * Locking: the function must be called from within a rcu read lock block.
926 *
927 */
928static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
929{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200930 struct ieee80211_sub_if_data *sdata = mpath->sdata;
Johannes Berg472dbc42008-09-11 00:01:49 +0200931 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100932 struct mesh_preq_queue *preq_node;
933
Andrey Yurovsky59615b52009-06-25 16:07:42 -0700934 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100935 if (!preq_node) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200936 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100937 return;
938 }
939
Baruch Siach987dafa2011-07-28 08:51:05 +0300940 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
Johannes Berg472dbc42008-09-11 00:01:49 +0200941 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
Baruch Siach987dafa2011-07-28 08:51:05 +0300942 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100943 kfree(preq_node);
944 if (printk_ratelimit())
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200945 mhwmp_dbg(sdata, "PREQ node queue full\n");
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100946 return;
947 }
948
Johannes Bergf2dc7982011-11-18 15:27:31 +0100949 spin_lock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700950 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
Johannes Bergf2dc7982011-11-18 15:27:31 +0100951 spin_unlock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700952 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Dan Carpenter88d53462011-11-15 09:33:31 +0300953 kfree(preq_node);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700954 return;
955 }
956
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100957 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
958 preq_node->flags = flags;
959
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700960 mpath->flags |= MESH_PATH_REQ_QUEUED;
Johannes Bergf2dc7982011-11-18 15:27:31 +0100961 spin_unlock(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -0700962
Johannes Berg472dbc42008-09-11 00:01:49 +0200963 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
964 ++ifmsh->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
Johannes Berg472dbc42008-09-11 00:01:49 +0200967 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
Johannes Berg64592c82010-06-10 10:21:31 +0200968 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100969
Johannes Berg472dbc42008-09-11 00:01:49 +0200970 else if (time_before(jiffies, ifmsh->last_preq)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100971 /* avoid long wait if did not send preqs for a long time
972 * and jiffies wrapped around
973 */
Johannes Berg472dbc42008-09-11 00:01:49 +0200974 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
Johannes Berg64592c82010-06-10 10:21:31 +0200975 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100976 } else
Johannes Berg472dbc42008-09-11 00:01:49 +0200977 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100978 min_preq_int_jiff(sdata));
979}
980
981/**
982 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
983 *
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200984 * @sdata: local mesh subif
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100985 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200986void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100987{
Johannes Berg472dbc42008-09-11 00:01:49 +0200988 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100989 struct mesh_preq_queue *preq_node;
990 struct mesh_path *mpath;
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +0800991 u8 ttl, target_flags = 0;
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +0800992 const u8 *da;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100993 u32 lifetime;
994
Johannes Berga43816d2009-07-10 11:39:26 +0200995 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
Johannes Berg472dbc42008-09-11 00:01:49 +0200996 if (!ifmsh->preq_queue_len ||
997 time_before(jiffies, ifmsh->last_preq +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +0100998 min_preq_int_jiff(sdata))) {
Johannes Berga43816d2009-07-10 11:39:26 +0200999 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001000 return;
1001 }
1002
Johannes Berg472dbc42008-09-11 00:01:49 +02001003 preq_node = list_first_entry(&ifmsh->preq_queue.list,
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001004 struct mesh_preq_queue, list);
1005 list_del(&preq_node->list);
Johannes Berg472dbc42008-09-11 00:01:49 +02001006 --ifmsh->preq_queue_len;
Johannes Berga43816d2009-07-10 11:39:26 +02001007 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001008
1009 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001010 mpath = mesh_path_lookup(sdata, preq_node->dst);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001011 if (!mpath)
1012 goto enddiscovery;
1013
1014 spin_lock_bh(&mpath->state_lock);
Javier Cardonaf3011cf2011-11-03 21:11:10 -07001015 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001016 if (preq_node->flags & PREQ_Q_F_START) {
1017 if (mpath->flags & MESH_PATH_RESOLVING) {
1018 spin_unlock_bh(&mpath->state_lock);
1019 goto enddiscovery;
1020 } else {
1021 mpath->flags &= ~MESH_PATH_RESOLVED;
1022 mpath->flags |= MESH_PATH_RESOLVING;
1023 mpath->discovery_retries = 0;
1024 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1025 }
1026 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1027 mpath->flags & MESH_PATH_RESOLVED) {
1028 mpath->flags &= ~MESH_PATH_RESOLVING;
1029 spin_unlock_bh(&mpath->state_lock);
1030 goto enddiscovery;
1031 }
1032
Johannes Berg472dbc42008-09-11 00:01:49 +02001033 ifmsh->last_preq = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001034
Rui Paulod19b3bf2009-11-09 23:46:55 +00001035 if (time_after(jiffies, ifmsh->last_sn_update +
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001036 net_traversal_jiffies(sdata)) ||
Rui Paulod19b3bf2009-11-09 23:46:55 +00001037 time_before(jiffies, ifmsh->last_sn_update)) {
1038 ++ifmsh->sn;
1039 sdata->u.mesh.last_sn_update = jiffies;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001040 }
1041 lifetime = default_lifetime(sdata);
Javier Cardona45904f22010-12-03 09:20:40 +01001042 ttl = sdata->u.mesh.mshcfg.element_ttl;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001043 if (ttl == 0) {
Johannes Berg472dbc42008-09-11 00:01:49 +02001044 sdata->u.mesh.mshstats.dropped_frames_ttl++;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001045 spin_unlock_bh(&mpath->state_lock);
1046 goto enddiscovery;
1047 }
1048
1049 if (preq_node->flags & PREQ_Q_F_REFRESH)
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +08001050 target_flags |= IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001051 else
Chun-Yeow Yeoh932e6282015-06-15 11:58:53 +08001052 target_flags &= ~IEEE80211_PREQ_TO_FLAG;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001053
1054 spin_unlock_bh(&mpath->state_lock);
Chun-Yeow Yeoh3d045a52012-02-28 22:00:06 +08001055 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001056 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn,
1057 target_flags, mpath->dst, mpath->sn, da, 0,
1058 ttl, lifetime, 0, ifmsh->preq_id++, sdata);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001059 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1060
1061enddiscovery:
1062 rcu_read_unlock();
1063 kfree(preq_node);
1064}
1065
Ben Hutchings2c530402012-07-10 10:55:09 +00001066/**
1067 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001068 *
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001069 * @skb: 802.11 frame to be sent
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +12001070 * @sdata: network subif the frame will be sent through
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001071 *
Ben Hutchings2c530402012-07-10 10:55:09 +00001072 * Lookup next hop for given skb and start path discovery if no
1073 * forwarding information is found.
1074 *
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001075 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1076 * skb is freeed here if no mpath could be allocated.
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001077 */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001078int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
1079 struct sk_buff *skb)
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001080{
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02001081 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001082 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1083 struct mesh_path *mpath;
1084 struct sk_buff *skb_to_free = NULL;
Rui Paulod19b3bf2009-11-09 23:46:55 +00001085 u8 *target_addr = hdr->addr3;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001086 int err = 0;
1087
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001088 /* Nulls are only sent to peers for PS and should be pre-addressed */
1089 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1090 return 0;
1091
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001092 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001093 err = mesh_nexthop_lookup(sdata, skb);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001094 if (!err)
1095 goto endlookup;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001096
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001097 /* no nexthop found, start resolving */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001098 mpath = mesh_path_lookup(sdata, target_addr);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001099 if (!mpath) {
Bob Copelandae76eef2013-03-29 09:38:39 -04001100 mpath = mesh_path_add(sdata, target_addr);
1101 if (IS_ERR(mpath)) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01001102 mesh_path_discard_frame(sdata, skb);
Bob Copelandae76eef2013-03-29 09:38:39 -04001103 err = PTR_ERR(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001104 goto endlookup;
1105 }
1106 }
1107
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001108 if (!(mpath->flags & MESH_PATH_RESOLVING))
1109 mesh_queue_preq(mpath, PREQ_Q_F_START);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001110
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001111 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1112 skb_to_free = skb_dequeue(&mpath->frame_queue);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001113
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001114 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1115 ieee80211_set_qos_hdr(sdata, skb);
1116 skb_queue_tail(&mpath->frame_queue, skb);
1117 err = -ENOENT;
1118 if (skb_to_free)
Johannes Bergbf7cd942013-02-15 14:40:31 +01001119 mesh_path_discard_frame(sdata, skb_to_free);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001120
1121endlookup:
1122 rcu_read_unlock();
1123 return err;
1124}
Johannes Bergbf7cd942013-02-15 14:40:31 +01001125
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001126/**
1127 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1128 * this function is considered "using" the associated mpath, so preempt a path
1129 * refresh if this mpath expires soon.
1130 *
1131 * @skb: 802.11 frame to be sent
1132 * @sdata: network subif the frame will be sent through
1133 *
1134 * Returns: 0 if the next hop was found. Nonzero otherwise.
1135 */
Johannes Bergbf7cd942013-02-15 14:40:31 +01001136int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
1137 struct sk_buff *skb)
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001138{
1139 struct mesh_path *mpath;
1140 struct sta_info *next_hop;
1141 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1142 u8 *target_addr = hdr->addr3;
1143 int err = -ENOENT;
1144
1145 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01001146 mpath = mesh_path_lookup(sdata, target_addr);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001147
1148 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
1149 goto endlookup;
1150
1151 if (time_after(jiffies,
1152 mpath->exp_time -
1153 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00001154 ether_addr_equal(sdata->vif.addr, hdr->addr4) &&
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001155 !(mpath->flags & MESH_PATH_RESOLVING) &&
1156 !(mpath->flags & MESH_PATH_FIXED))
1157 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1158
1159 next_hop = rcu_dereference(mpath->next_hop);
1160 if (next_hop) {
1161 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1162 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001163 ieee80211_mps_set_frame_flags(sdata, next_hop, hdr);
Thomas Pedersen0cfda852011-11-24 17:15:25 -08001164 err = 0;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001165 }
1166
1167endlookup:
1168 rcu_read_unlock();
1169 return err;
1170}
1171
1172void mesh_path_timer(unsigned long data)
1173{
Johannes Bergdea40962011-05-12 15:03:32 +02001174 struct mesh_path *mpath = (void *) data;
1175 struct ieee80211_sub_if_data *sdata = mpath->sdata;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001176 int ret;
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001177
Johannes Bergdea40962011-05-12 15:03:32 +02001178 if (sdata->local->quiescing)
Johannes Berg5bb644a2009-05-17 11:40:42 +02001179 return;
Johannes Berg5bb644a2009-05-17 11:40:42 +02001180
1181 spin_lock_bh(&mpath->state_lock);
Luis Carlos Cobocfa22c72008-02-29 15:04:13 -08001182 if (mpath->flags & MESH_PATH_RESOLVED ||
Javier Cardona5ee68e52011-08-09 16:45:08 -07001183 (!(mpath->flags & MESH_PATH_RESOLVING))) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001184 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
Javier Cardona5ee68e52011-08-09 16:45:08 -07001185 spin_unlock_bh(&mpath->state_lock);
1186 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001187 ++mpath->discovery_retries;
1188 mpath->discovery_timeout *= 2;
Javier Cardonaf3011cf2011-11-03 21:11:10 -07001189 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001190 spin_unlock_bh(&mpath->state_lock);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001191 mesh_queue_preq(mpath, 0);
1192 } else {
Jesse Jonesd8254712015-06-12 14:13:09 -07001193 mpath->flags &= ~(MESH_PATH_RESOLVING |
1194 MESH_PATH_RESOLVED |
1195 MESH_PATH_REQ_QUEUED);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001196 mpath->exp_time = jiffies;
Javier Cardona5ee68e52011-08-09 16:45:08 -07001197 spin_unlock_bh(&mpath->state_lock);
1198 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1199 ret = mesh_path_send_to_gates(mpath);
1200 if (ret)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001201 mhwmp_dbg(sdata, "no gate was reachable\n");
Javier Cardona5ee68e52011-08-09 16:45:08 -07001202 } else
1203 mesh_path_flush_pending(mpath);
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001204 }
Luis Carlos Cobo050ac522008-02-23 15:17:15 +01001205}
Rui Pauloe304bfd2009-11-09 23:46:56 +00001206
Johannes Bergbf7cd942013-02-15 14:40:31 +01001207void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
Rui Pauloe304bfd2009-11-09 23:46:56 +00001208{
1209 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Javier Cardona0507e152011-08-09 16:45:10 -07001210 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001211 u8 flags, target_flags = 0;
Rui Pauloe304bfd2009-11-09 23:46:56 +00001212
Javier Cardona16dd7262011-08-09 16:45:11 -07001213 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1214 ? RANN_FLAG_IS_GATE : 0;
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001215
1216 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) {
1217 case IEEE80211_PROACTIVE_RANN:
1218 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001219 ++ifmsh->sn, 0, NULL, 0, broadcast_addr,
1220 0, ifmsh->mshcfg.element_ttl,
1221 interval, 0, 0, sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001222 break;
1223 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1224 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1225 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1226 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1227 target_flags |= IEEE80211_PREQ_TO_FLAG |
1228 IEEE80211_PREQ_USN_FLAG;
1229 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08001230 ++ifmsh->sn, target_flags,
1231 (u8 *) broadcast_addr, 0, broadcast_addr,
1232 0, ifmsh->mshcfg.element_ttl, interval,
1233 0, ifmsh->preq_id++, sdata);
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001234 break;
1235 default:
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001236 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");
Chun-Yeow Yeoha69cc442012-06-14 02:06:07 +08001237 return;
1238 }
Rui Pauloe304bfd2009-11-09 23:46:56 +00001239}