Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1 | /* |
Rui Paulo | 264d9b7 | 2009-11-09 23:46:58 +0000 | [diff] [blame] | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 3 | * 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 Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 10 | #include <linux/slab.h> |
Felix Fietkau | 888d04d | 2012-03-01 15:22:09 +0100 | [diff] [blame] | 11 | #include <linux/etherdevice.h> |
Johannes Berg | d26ad37 | 2012-02-20 11:38:41 +0100 | [diff] [blame] | 12 | #include <asm/unaligned.h> |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 13 | #include "wme.h" |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 14 | #include "mesh.h" |
| 15 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 16 | #define TEST_FRAME_LEN 8192 |
| 17 | #define MAX_METRIC 0xffffffff |
| 18 | #define ARITH_SHIFT 8 |
Manoharan, Rajkumar | fe56c9c | 2017-02-15 12:46:50 -0800 | [diff] [blame] | 19 | #define LINK_FAIL_THRESH 95 |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 20 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 21 | #define MAX_PREQ_QUEUE_LEN 64 |
| 22 | |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 23 | static void mesh_queue_preq(struct mesh_path *, u8); |
| 24 | |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 25 | static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae) |
Luis Carlos Cobo | a00de5d | 2008-02-29 17:07:54 -0800 | [diff] [blame] | 26 | { |
| 27 | if (ae) |
| 28 | offset += 6; |
Harvey Harrison | ae7245c | 2008-05-01 22:19:33 -0700 | [diff] [blame] | 29 | return get_unaligned_le32(preq_elem + offset); |
Luis Carlos Cobo | a00de5d | 2008-02-29 17:07:54 -0800 | [diff] [blame] | 30 | } |
| 31 | |
Bob Copeland | aee6499 | 2014-04-15 10:43:06 -0400 | [diff] [blame] | 32 | static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae) |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 33 | { |
| 34 | if (ae) |
| 35 | offset += 6; |
| 36 | return get_unaligned_le16(preq_elem + offset); |
| 37 | } |
| 38 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 39 | /* HWMP IE processing macros */ |
Luis Carlos Cobo | a00de5d | 2008-02-29 17:07:54 -0800 | [diff] [blame] | 40 | #define AE_F (1<<6) |
| 41 | #define AE_F_SET(x) (*x & AE_F) |
| 42 | #define PREQ_IE_FLAGS(x) (*(x)) |
| 43 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) |
| 44 | #define PREQ_IE_TTL(x) (*(x + 2)) |
| 45 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) |
| 46 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) |
Phil Carmody | 497888c | 2011-07-14 15:07:13 +0300 | [diff] [blame] | 47 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
| 48 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) |
| 49 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 50 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
| 51 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) |
Phil Carmody | 497888c | 2011-07-14 15:07:13 +0300 | [diff] [blame] | 52 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 53 | |
| 54 | |
Luis Carlos Cobo | a00de5d | 2008-02-29 17:07:54 -0800 | [diff] [blame] | 55 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) |
| 56 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) |
| 57 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 58 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
| 59 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) |
Phil Carmody | 497888c | 2011-07-14 15:07:13 +0300 | [diff] [blame] | 60 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
| 61 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 62 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
| 63 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 64 | |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 65 | #define PERR_IE_TTL(x) (*(x)) |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 66 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
| 67 | #define PERR_IE_TARGET_ADDR(x) (x + 3) |
Phil Carmody | 497888c | 2011-07-14 15:07:13 +0300 | [diff] [blame] | 68 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
| 69 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 70 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 71 | #define MSEC_TO_TU(x) (x*1000/1024) |
Chun-Yeow Yeoh | d2a079f | 2012-03-23 18:48:51 +0800 | [diff] [blame] | 72 | #define SN_GT(x, y) ((s32)(y - x) < 0) |
| 73 | #define SN_LT(x, y) ((s32)(x - y) < 0) |
Jesse Jones | d8f0300 | 2015-06-12 15:38:07 -0700 | [diff] [blame] | 74 | #define MAX_SANE_SN_DELTA 32 |
| 75 | |
| 76 | static inline u32 SN_DELTA(u32 x, u32 y) |
| 77 | { |
| 78 | return x >= y ? x - y : y - x; |
| 79 | } |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 80 | |
| 81 | #define net_traversal_jiffies(s) \ |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 82 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 83 | #define default_lifetime(s) \ |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 84 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 85 | #define min_preq_int_jiff(s) \ |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 86 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
| 87 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 88 | #define disc_timeout_jiff(s) \ |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 89 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
Chun-Yeow Yeoh | 728b19e | 2012-06-14 02:06:10 +0800 | [diff] [blame] | 90 | #define root_path_confirmation_jiffies(s) \ |
| 91 | msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 92 | |
| 93 | enum mpath_frame_type { |
| 94 | MPATH_PREQ = 0, |
| 95 | MPATH_PREP, |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 96 | MPATH_PERR, |
| 97 | MPATH_RANN |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 98 | }; |
| 99 | |
Johannes Berg | 15ff636 | 2009-11-17 13:34:04 +0100 | [diff] [blame] | 100 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
| 101 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 102 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 103 | const u8 *orig_addr, u32 orig_sn, |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 104 | u8 target_flags, const u8 *target, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 105 | u32 target_sn, const u8 *da, |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 106 | u8 hop_count, u8 ttl, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 107 | u32 lifetime, u32 metric, u32 preq_id, |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 108 | struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 109 | { |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 110 | struct ieee80211_local *local = sdata->local; |
Thomas Pedersen | 3b69a9c | 2011-10-26 14:47:25 -0700 | [diff] [blame] | 111 | struct sk_buff *skb; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 112 | struct ieee80211_mgmt *mgmt; |
Thomas Pedersen | 3b69a9c | 2011-10-26 14:47:25 -0700 | [diff] [blame] | 113 | u8 *pos, ie_len; |
| 114 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + |
| 115 | sizeof(mgmt->u.action.u.mesh_action); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 116 | |
Javier Cardona | 65e8b0c | 2012-01-17 18:17:46 -0800 | [diff] [blame] | 117 | skb = dev_alloc_skb(local->tx_headroom + |
Thomas Pedersen | 3b69a9c | 2011-10-26 14:47:25 -0700 | [diff] [blame] | 118 | hdr_len + |
| 119 | 2 + 37); /* max HWMP IE */ |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 120 | if (!skb) |
| 121 | return -1; |
Javier Cardona | 65e8b0c | 2012-01-17 18:17:46 -0800 | [diff] [blame] | 122 | skb_reserve(skb, local->tx_headroom); |
Thomas Pedersen | 3b69a9c | 2011-10-26 14:47:25 -0700 | [diff] [blame] | 123 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
| 124 | memset(mgmt, 0, hdr_len); |
Harvey Harrison | e7827a7 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 125 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 126 | IEEE80211_STYPE_ACTION); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 127 | |
| 128 | memcpy(mgmt->da, da, ETH_ALEN); |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 129 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 130 | /* BSSID == SA */ |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 131 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 132 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
| 133 | mgmt->u.action.u.mesh_action.action_code = |
| 134 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 135 | |
| 136 | switch (action) { |
| 137 | case MPATH_PREQ: |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 138 | mhwmp_dbg(sdata, "sending PREQ to %pM\n", target); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 139 | ie_len = 37; |
| 140 | pos = skb_put(skb, 2 + ie_len); |
| 141 | *pos++ = WLAN_EID_PREQ; |
| 142 | break; |
| 143 | case MPATH_PREP: |
Chun-Yeow Yeoh | 0f71651 | 2013-04-03 17:49:53 +0800 | [diff] [blame] | 144 | mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 145 | ie_len = 31; |
| 146 | pos = skb_put(skb, 2 + ie_len); |
| 147 | *pos++ = WLAN_EID_PREP; |
| 148 | break; |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 149 | case MPATH_RANN: |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 150 | mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr); |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 151 | ie_len = sizeof(struct ieee80211_rann_ie); |
| 152 | pos = skb_put(skb, 2 + ie_len); |
| 153 | *pos++ = WLAN_EID_RANN; |
| 154 | break; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 155 | default: |
Patrick McHardy | 812714d | 2008-05-06 12:52:07 +0200 | [diff] [blame] | 156 | kfree_skb(skb); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 157 | return -ENOTSUPP; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 158 | } |
| 159 | *pos++ = ie_len; |
| 160 | *pos++ = flags; |
| 161 | *pos++ = hop_count; |
| 162 | *pos++ = ttl; |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 163 | if (action == MPATH_PREP) { |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 164 | memcpy(pos, target, ETH_ALEN); |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 165 | pos += ETH_ALEN; |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 166 | put_unaligned_le32(target_sn, pos); |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 167 | pos += 4; |
| 168 | } else { |
| 169 | if (action == MPATH_PREQ) { |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 170 | put_unaligned_le32(preq_id, pos); |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 171 | pos += 4; |
| 172 | } |
| 173 | memcpy(pos, orig_addr, ETH_ALEN); |
| 174 | pos += ETH_ALEN; |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 175 | put_unaligned_le32(orig_sn, pos); |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 176 | pos += 4; |
| 177 | } |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 178 | put_unaligned_le32(lifetime, pos); /* interval for RANN */ |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 179 | pos += 4; |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 180 | put_unaligned_le32(metric, pos); |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 181 | pos += 4; |
| 182 | if (action == MPATH_PREQ) { |
| 183 | *pos++ = 1; /* destination count */ |
| 184 | *pos++ = target_flags; |
| 185 | memcpy(pos, target, ETH_ALEN); |
| 186 | pos += ETH_ALEN; |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 187 | put_unaligned_le32(target_sn, pos); |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 188 | pos += 4; |
| 189 | } else if (action == MPATH_PREP) { |
| 190 | memcpy(pos, orig_addr, ETH_ALEN); |
| 191 | pos += ETH_ALEN; |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 192 | put_unaligned_le32(orig_sn, pos); |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 193 | pos += 4; |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 194 | } |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 195 | |
Johannes Berg | 62ae67b | 2009-11-18 18:42:05 +0100 | [diff] [blame] | 196 | ieee80211_tx_skb(sdata, skb); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 197 | return 0; |
| 198 | } |
| 199 | |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 200 | |
| 201 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient |
| 202 | * headroom in case the frame is encrypted. */ |
| 203 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, |
| 204 | struct sk_buff *skb) |
| 205 | { |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 206 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
Marco Porsch | 3f52b7e | 2013-01-30 18:14:08 +0100 | [diff] [blame] | 207 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 208 | |
Zhang Shengju | d57a544 | 2016-03-03 01:16:56 +0000 | [diff] [blame] | 209 | skb_reset_mac_header(skb); |
| 210 | skb_reset_network_header(skb); |
| 211 | skb_reset_transport_header(skb); |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 212 | |
| 213 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ |
| 214 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); |
| 215 | skb->priority = 7; |
| 216 | |
| 217 | info->control.vif = &sdata->vif; |
Bob Copeland | 9cbbffe | 2013-01-09 12:34:55 -0500 | [diff] [blame] | 218 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
Javier Cardona | 2154c81 | 2011-09-07 17:49:53 -0700 | [diff] [blame] | 219 | ieee80211_set_qos_hdr(sdata, skb); |
Marco Porsch | 3f52b7e | 2013-01-30 18:14:08 +0100 | [diff] [blame] | 220 | ieee80211_mps_set_frame_flags(sdata, NULL, hdr); |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 223 | /** |
Bob Copeland | 75ea719 | 2013-01-03 00:09:46 -0500 | [diff] [blame] | 224 | * mesh_path_error_tx - Sends a PERR mesh management frame |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 225 | * |
Bob Copeland | 75ea719 | 2013-01-03 00:09:46 -0500 | [diff] [blame] | 226 | * @ttl: allowed remaining hops |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 227 | * @target: broken destination |
| 228 | * @target_sn: SN of the broken destination |
| 229 | * @target_rcode: reason code for this PERR |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 230 | * @ra: node this frame is addressed to |
Bob Copeland | 75ea719 | 2013-01-03 00:09:46 -0500 | [diff] [blame] | 231 | * @sdata: local mesh subif |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 232 | * |
| 233 | * Note: This function may be called with driver locks taken that the driver |
| 234 | * also acquires in the TX path. To avoid a deadlock we don't transmit the |
| 235 | * frame directly but add it to the pending queue instead. |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 236 | */ |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 237 | int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 238 | u8 ttl, const u8 *target, u32 target_sn, |
| 239 | u16 target_rcode, const u8 *ra) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 240 | { |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 241 | struct ieee80211_local *local = sdata->local; |
Thomas Pedersen | 3b69a9c | 2011-10-26 14:47:25 -0700 | [diff] [blame] | 242 | struct sk_buff *skb; |
Thomas Pedersen | dca7e94 | 2011-11-24 17:15:24 -0800 | [diff] [blame] | 243 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 244 | struct ieee80211_mgmt *mgmt; |
Thomas Pedersen | 3b69a9c | 2011-10-26 14:47:25 -0700 | [diff] [blame] | 245 | u8 *pos, ie_len; |
| 246 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + |
| 247 | sizeof(mgmt->u.action.u.mesh_action); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 248 | |
Thomas Pedersen | dca7e94 | 2011-11-24 17:15:24 -0800 | [diff] [blame] | 249 | if (time_before(jiffies, ifmsh->next_perr)) |
| 250 | return -EAGAIN; |
| 251 | |
Javier Cardona | 65e8b0c | 2012-01-17 18:17:46 -0800 | [diff] [blame] | 252 | skb = dev_alloc_skb(local->tx_headroom + |
Max Stepanov | 2475b1cc | 2013-03-24 14:23:27 +0200 | [diff] [blame] | 253 | sdata->encrypt_headroom + |
Bob Copeland | 8680451 | 2013-01-09 12:34:56 -0500 | [diff] [blame] | 254 | IEEE80211_ENCRYPT_TAILROOM + |
Thomas Pedersen | 3b69a9c | 2011-10-26 14:47:25 -0700 | [diff] [blame] | 255 | hdr_len + |
| 256 | 2 + 15 /* PERR IE */); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 257 | if (!skb) |
| 258 | return -1; |
Max Stepanov | 2475b1cc | 2013-03-24 14:23:27 +0200 | [diff] [blame] | 259 | skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom); |
Thomas Pedersen | 3b69a9c | 2011-10-26 14:47:25 -0700 | [diff] [blame] | 260 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
| 261 | memset(mgmt, 0, hdr_len); |
Harvey Harrison | e7827a7 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 262 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 263 | IEEE80211_STYPE_ACTION); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 264 | |
| 265 | memcpy(mgmt->da, ra, ETH_ALEN); |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 266 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
Thomas Pedersen | 25d49e4 | 2011-08-11 19:35:15 -0700 | [diff] [blame] | 267 | /* BSSID == SA */ |
| 268 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
| 269 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
| 270 | mgmt->u.action.u.mesh_action.action_code = |
| 271 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 272 | ie_len = 15; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 273 | pos = skb_put(skb, 2 + ie_len); |
| 274 | *pos++ = WLAN_EID_PERR; |
| 275 | *pos++ = ie_len; |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 276 | /* ttl */ |
Javier Cardona | 45904f2 | 2010-12-03 09:20:40 +0100 | [diff] [blame] | 277 | *pos++ = ttl; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 278 | /* number of destinations */ |
| 279 | *pos++ = 1; |
Chun-Yeow Yeoh | 932e628 | 2015-06-15 11:58:53 +0800 | [diff] [blame] | 280 | /* Flags field has AE bit only as defined in |
| 281 | * sec 8.4.2.117 IEEE802.11-2012 |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 282 | */ |
| 283 | *pos = 0; |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 284 | pos++; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 285 | memcpy(pos, target, ETH_ALEN); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 286 | pos += ETH_ALEN; |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 287 | put_unaligned_le32(target_sn, pos); |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 288 | pos += 4; |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 289 | put_unaligned_le16(target_rcode, pos); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 290 | |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 291 | /* see note in function header */ |
| 292 | prepare_frame_for_deferred_tx(sdata, skb); |
Thomas Pedersen | dca7e94 | 2011-11-24 17:15:24 -0800 | [diff] [blame] | 293 | ifmsh->next_perr = TU_TO_EXP_TIME( |
| 294 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); |
Javier Cardona | 2cca397 | 2011-09-06 12:10:43 -0700 | [diff] [blame] | 295 | ieee80211_add_pending_skb(local, skb); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 296 | return 0; |
| 297 | } |
| 298 | |
Javier Cardona | bfc32e6 | 2009-08-17 17:15:55 -0700 | [diff] [blame] | 299 | void ieee80211s_update_metric(struct ieee80211_local *local, |
Javier Cardona | 35b3fe1c | 2012-06-08 13:30:25 -0700 | [diff] [blame] | 300 | struct sta_info *sta, struct sk_buff *skb) |
Javier Cardona | bfc32e6 | 2009-08-17 17:15:55 -0700 | [diff] [blame] | 301 | { |
| 302 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); |
| 303 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 304 | int failed; |
| 305 | |
| 306 | if (!ieee80211_is_data(hdr->frame_control)) |
| 307 | return; |
| 308 | |
| 309 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); |
| 310 | |
Manoharan, Rajkumar | 3eb0928 | 2017-02-14 12:27:16 -0800 | [diff] [blame] | 311 | /* moving average, scaled to 100. |
| 312 | * feed failure as 100 and success as 0 |
| 313 | */ |
| 314 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, failed * 100); |
Manoharan, Rajkumar | fe56c9c | 2017-02-15 12:46:50 -0800 | [diff] [blame] | 315 | if (ewma_mesh_fail_avg_read(&sta->mesh->fail_avg) > |
| 316 | LINK_FAIL_THRESH) |
Javier Cardona | 35b3fe1c | 2012-06-08 13:30:25 -0700 | [diff] [blame] | 317 | mesh_plink_broken(sta); |
Javier Cardona | bfc32e6 | 2009-08-17 17:15:55 -0700 | [diff] [blame] | 318 | } |
| 319 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 320 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
| 321 | struct sta_info *sta) |
| 322 | { |
Thomas Pedersen | 6b62bf3 | 2012-03-05 15:31:48 -0800 | [diff] [blame] | 323 | struct rate_info rinfo; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 324 | /* This should be adjusted for each device */ |
| 325 | int device_constant = 1 << ARITH_SHIFT; |
| 326 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; |
| 327 | int s_unit = 1 << ARITH_SHIFT; |
| 328 | int rate, err; |
| 329 | u32 tx_time, estimated_retx; |
| 330 | u64 result; |
Manoharan, Rajkumar | 3eb0928 | 2017-02-14 12:27:16 -0800 | [diff] [blame] | 331 | unsigned long fail_avg = |
| 332 | ewma_mesh_fail_avg_read(&sta->mesh->fail_avg); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 333 | |
Maxim Altshul | 3b17fbf | 2016-07-11 17:15:24 +0300 | [diff] [blame] | 334 | /* Try to get rate based on HW/SW RC algorithm. |
| 335 | * Rate is returned in units of Kbps, correct this |
| 336 | * to comply with airtime calculation units |
| 337 | * Round up in case we get rate < 100Kbps |
| 338 | */ |
| 339 | rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 100); |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 340 | |
Maxim Altshul | 3b17fbf | 2016-07-11 17:15:24 +0300 | [diff] [blame] | 341 | if (rate) { |
| 342 | err = 0; |
| 343 | } else { |
Manoharan, Rajkumar | fe56c9c | 2017-02-15 12:46:50 -0800 | [diff] [blame] | 344 | if (fail_avg > LINK_FAIL_THRESH) |
Maxim Altshul | 3b17fbf | 2016-07-11 17:15:24 +0300 | [diff] [blame] | 345 | return MAX_METRIC; |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 346 | |
Maxim Altshul | 3b17fbf | 2016-07-11 17:15:24 +0300 | [diff] [blame] | 347 | sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo); |
| 348 | rate = cfg80211_calculate_bitrate(&rinfo); |
| 349 | if (WARN_ON(!rate)) |
| 350 | return MAX_METRIC; |
| 351 | |
Manoharan, Rajkumar | 3eb0928 | 2017-02-14 12:27:16 -0800 | [diff] [blame] | 352 | err = (fail_avg << ARITH_SHIFT) / 100; |
Maxim Altshul | 3b17fbf | 2016-07-11 17:15:24 +0300 | [diff] [blame] | 353 | } |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 354 | |
| 355 | /* bitrate is in units of 100 Kbps, while we need rate in units of |
| 356 | * 1Mbps. This will be corrected on tx_time computation. |
| 357 | */ |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 358 | tx_time = (device_constant + 10 * test_frame_len / rate); |
| 359 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); |
Maxim Altshul | 3b17fbf | 2016-07-11 17:15:24 +0300 | [diff] [blame] | 360 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 361 | return (u32)result; |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * hwmp_route_info_get - Update routing info to originator and transmitter |
| 366 | * |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 367 | * @sdata: local mesh subif |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 368 | * @mgmt: mesh management frame |
| 369 | * @hwmp_ie: hwmp information element (PREP or PREQ) |
Bob Copeland | 75ea719 | 2013-01-03 00:09:46 -0500 | [diff] [blame] | 370 | * @action: type of hwmp ie |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 371 | * |
| 372 | * This function updates the path routing information to the originator and the |
Andrey Yurovsky | f99288d | 2009-10-20 12:17:34 -0700 | [diff] [blame] | 373 | * transmitter of a HWMP PREQ or PREP frame. |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 374 | * |
| 375 | * Returns: metric to frame originator or 0 if the frame should not be further |
| 376 | * processed |
| 377 | * |
| 378 | * Notes: this function is the only place (besides user-provided info) where |
| 379 | * path routing information is updated. |
| 380 | */ |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 381 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 382 | struct ieee80211_mgmt *mgmt, |
| 383 | const u8 *hwmp_ie, enum mpath_frame_type action) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 384 | { |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 385 | struct ieee80211_local *local = sdata->local; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 386 | struct mesh_path *mpath; |
| 387 | struct sta_info *sta; |
| 388 | bool fresh_info; |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 389 | const u8 *orig_addr, *ta; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 390 | u32 orig_sn, orig_metric; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 391 | unsigned long orig_lifetime, exp_time; |
| 392 | u32 last_hop_metric, new_metric; |
| 393 | bool process = true; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 394 | |
| 395 | rcu_read_lock(); |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 396 | sta = sta_info_get(sdata, mgmt->sa); |
Johannes Berg | dc0b0f7 | 2008-02-23 15:17:20 +0100 | [diff] [blame] | 397 | if (!sta) { |
| 398 | rcu_read_unlock(); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 399 | return 0; |
Johannes Berg | dc0b0f7 | 2008-02-23 15:17:20 +0100 | [diff] [blame] | 400 | } |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 401 | |
| 402 | last_hop_metric = airtime_link_metric_get(local, sta); |
| 403 | /* Update and check originator routing info */ |
| 404 | fresh_info = true; |
| 405 | |
| 406 | switch (action) { |
| 407 | case MPATH_PREQ: |
| 408 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 409 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 410 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
| 411 | orig_metric = PREQ_IE_METRIC(hwmp_ie); |
| 412 | break; |
| 413 | case MPATH_PREP: |
Thomas Pedersen | 3c26f1f | 2011-11-24 17:15:22 -0800 | [diff] [blame] | 414 | /* Originator here refers to the MP that was the target in the |
| 415 | * Path Request. We divert from the nomenclature in the draft |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 416 | * so that we can easily use a single function to gather path |
| 417 | * information from both PREQ and PREP frames. |
| 418 | */ |
Thomas Pedersen | 3c26f1f | 2011-11-24 17:15:22 -0800 | [diff] [blame] | 419 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
| 420 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 421 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
| 422 | orig_metric = PREP_IE_METRIC(hwmp_ie); |
| 423 | break; |
| 424 | default: |
Johannes Berg | dc0b0f7 | 2008-02-23 15:17:20 +0100 | [diff] [blame] | 425 | rcu_read_unlock(); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 426 | return 0; |
| 427 | } |
| 428 | new_metric = orig_metric + last_hop_metric; |
| 429 | if (new_metric < orig_metric) |
| 430 | new_metric = MAX_METRIC; |
| 431 | exp_time = TU_TO_EXP_TIME(orig_lifetime); |
| 432 | |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 433 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 434 | /* This MP is the originator, we are not interested in this |
| 435 | * frame, except for updating transmitter's path info. |
| 436 | */ |
| 437 | process = false; |
| 438 | fresh_info = false; |
| 439 | } else { |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 440 | mpath = mesh_path_lookup(sdata, orig_addr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 441 | if (mpath) { |
| 442 | spin_lock_bh(&mpath->state_lock); |
| 443 | if (mpath->flags & MESH_PATH_FIXED) |
| 444 | fresh_info = false; |
| 445 | else if ((mpath->flags & MESH_PATH_ACTIVE) && |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 446 | (mpath->flags & MESH_PATH_SN_VALID)) { |
| 447 | if (SN_GT(mpath->sn, orig_sn) || |
| 448 | (mpath->sn == orig_sn && |
Porsch, Marco | 533866b | 2010-02-24 09:53:13 +0100 | [diff] [blame] | 449 | new_metric >= mpath->metric)) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 450 | process = false; |
| 451 | fresh_info = false; |
| 452 | } |
Jesse Jones | d8f0300 | 2015-06-12 15:38:07 -0700 | [diff] [blame] | 453 | } else if (!(mpath->flags & MESH_PATH_ACTIVE)) { |
| 454 | bool have_sn, newer_sn, bounced; |
| 455 | |
| 456 | have_sn = mpath->flags & MESH_PATH_SN_VALID; |
| 457 | newer_sn = have_sn && SN_GT(orig_sn, mpath->sn); |
| 458 | bounced = have_sn && |
| 459 | (SN_DELTA(orig_sn, mpath->sn) > |
| 460 | MAX_SANE_SN_DELTA); |
| 461 | |
| 462 | if (!have_sn || newer_sn) { |
| 463 | /* if SN is newer than what we had |
| 464 | * then we can take it */; |
| 465 | } else if (bounced) { |
| 466 | /* if SN is way different than what |
| 467 | * we had then assume the other side |
| 468 | * rebooted or restarted */; |
| 469 | } else { |
| 470 | process = false; |
| 471 | fresh_info = false; |
| 472 | } |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 473 | } |
| 474 | } else { |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 475 | mpath = mesh_path_add(sdata, orig_addr); |
| 476 | if (IS_ERR(mpath)) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 477 | rcu_read_unlock(); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 478 | return 0; |
| 479 | } |
| 480 | spin_lock_bh(&mpath->state_lock); |
| 481 | } |
| 482 | |
| 483 | if (fresh_info) { |
| 484 | mesh_path_assign_nexthop(mpath, sta); |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 485 | mpath->flags |= MESH_PATH_SN_VALID; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 486 | mpath->metric = new_metric; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 487 | mpath->sn = orig_sn; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 488 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
| 489 | ? mpath->exp_time : exp_time; |
| 490 | mesh_path_activate(mpath); |
| 491 | spin_unlock_bh(&mpath->state_lock); |
Manoharan, Rajkumar | 3eb0928 | 2017-02-14 12:27:16 -0800 | [diff] [blame] | 492 | ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
| 493 | /* init it at a low value - 0 start is tricky */ |
| 494 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 495 | mesh_path_tx_pending(mpath); |
| 496 | /* draft says preq_id should be saved to, but there does |
| 497 | * not seem to be any use for it, skipping by now |
| 498 | */ |
| 499 | } else |
| 500 | spin_unlock_bh(&mpath->state_lock); |
| 501 | } |
| 502 | |
| 503 | /* Update and check transmitter routing info */ |
| 504 | ta = mgmt->sa; |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 505 | if (ether_addr_equal(orig_addr, ta)) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 506 | fresh_info = false; |
| 507 | else { |
| 508 | fresh_info = true; |
| 509 | |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 510 | mpath = mesh_path_lookup(sdata, ta); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 511 | if (mpath) { |
| 512 | spin_lock_bh(&mpath->state_lock); |
| 513 | if ((mpath->flags & MESH_PATH_FIXED) || |
| 514 | ((mpath->flags & MESH_PATH_ACTIVE) && |
| 515 | (last_hop_metric > mpath->metric))) |
| 516 | fresh_info = false; |
| 517 | } else { |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 518 | mpath = mesh_path_add(sdata, ta); |
| 519 | if (IS_ERR(mpath)) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 520 | rcu_read_unlock(); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 521 | return 0; |
| 522 | } |
| 523 | spin_lock_bh(&mpath->state_lock); |
| 524 | } |
| 525 | |
| 526 | if (fresh_info) { |
| 527 | mesh_path_assign_nexthop(mpath, sta); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 528 | mpath->metric = last_hop_metric; |
| 529 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
| 530 | ? mpath->exp_time : exp_time; |
| 531 | mesh_path_activate(mpath); |
| 532 | spin_unlock_bh(&mpath->state_lock); |
Manoharan, Rajkumar | 3eb0928 | 2017-02-14 12:27:16 -0800 | [diff] [blame] | 533 | ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
| 534 | /* init it at a low value - 0 start is tricky */ |
| 535 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 536 | mesh_path_tx_pending(mpath); |
| 537 | } else |
| 538 | spin_unlock_bh(&mpath->state_lock); |
| 539 | } |
| 540 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 541 | rcu_read_unlock(); |
| 542 | |
| 543 | return process ? new_metric : 0; |
| 544 | } |
| 545 | |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 546 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 547 | struct ieee80211_mgmt *mgmt, |
Alexis Green | 5ec596c | 2015-06-09 16:20:24 -0700 | [diff] [blame] | 548 | const u8 *preq_elem, u32 orig_metric) |
David Woo | 57ef5dd | 2009-08-12 11:03:43 -0700 | [diff] [blame] | 549 | { |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 550 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
Chun-Yeow Yeoh | 3d045a5 | 2012-02-28 22:00:06 +0800 | [diff] [blame] | 551 | struct mesh_path *mpath = NULL; |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 552 | const u8 *target_addr, *orig_addr; |
Chun-Yeow Yeoh | 3d045a5 | 2012-02-28 22:00:06 +0800 | [diff] [blame] | 553 | const u8 *da; |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 554 | u8 target_flags, ttl, flags; |
Jeff Mahoney | b4201cc | 2016-04-04 14:15:23 -0400 | [diff] [blame] | 555 | u32 orig_sn, target_sn, lifetime, target_metric = 0; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 556 | bool reply = false; |
| 557 | bool forward = true; |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 558 | bool root_is_gate; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 559 | |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 560 | /* Update target SN, if present */ |
| 561 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 562 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 563 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
| 564 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); |
| 565 | target_flags = PREQ_IE_TARGET_F(preq_elem); |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 566 | /* Proactive PREQ gate announcements */ |
| 567 | flags = PREQ_IE_FLAGS(preq_elem); |
| 568 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 569 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 570 | mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
Rui Paulo | 27db2e4 | 2009-11-09 23:46:45 +0000 | [diff] [blame] | 571 | |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 572 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 573 | mhwmp_dbg(sdata, "PREQ is for us\n"); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 574 | forward = false; |
| 575 | reply = true; |
Alexis Green | 5ec596c | 2015-06-09 16:20:24 -0700 | [diff] [blame] | 576 | target_metric = 0; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 577 | if (time_after(jiffies, ifmsh->last_sn_update + |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 578 | net_traversal_jiffies(sdata)) || |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 579 | time_before(jiffies, ifmsh->last_sn_update)) { |
Bob Copeland | bc3ce0b | 2014-04-15 10:43:08 -0400 | [diff] [blame] | 580 | ++ifmsh->sn; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 581 | ifmsh->last_sn_update = jiffies; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 582 | } |
Bob Copeland | bc3ce0b | 2014-04-15 10:43:08 -0400 | [diff] [blame] | 583 | target_sn = ifmsh->sn; |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 584 | } else if (is_broadcast_ether_addr(target_addr) && |
| 585 | (target_flags & IEEE80211_PREQ_TO_FLAG)) { |
| 586 | rcu_read_lock(); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 587 | mpath = mesh_path_lookup(sdata, orig_addr); |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 588 | if (mpath) { |
| 589 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { |
| 590 | reply = true; |
| 591 | target_addr = sdata->vif.addr; |
| 592 | target_sn = ++ifmsh->sn; |
Alexis Green | 5ec596c | 2015-06-09 16:20:24 -0700 | [diff] [blame] | 593 | target_metric = 0; |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 594 | ifmsh->last_sn_update = jiffies; |
| 595 | } |
| 596 | if (root_is_gate) |
| 597 | mesh_path_add_gate(mpath); |
| 598 | } |
| 599 | rcu_read_unlock(); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 600 | } else { |
| 601 | rcu_read_lock(); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 602 | mpath = mesh_path_lookup(sdata, target_addr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 603 | if (mpath) { |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 604 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
| 605 | SN_LT(mpath->sn, target_sn)) { |
| 606 | mpath->sn = target_sn; |
| 607 | mpath->flags |= MESH_PATH_SN_VALID; |
Chun-Yeow Yeoh | 932e628 | 2015-06-15 11:58:53 +0800 | [diff] [blame] | 608 | } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) && |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 609 | (mpath->flags & MESH_PATH_ACTIVE)) { |
| 610 | reply = true; |
Alexis Green | 5ec596c | 2015-06-09 16:20:24 -0700 | [diff] [blame] | 611 | target_metric = mpath->metric; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 612 | target_sn = mpath->sn; |
Chun-Yeow Yeoh | 932e628 | 2015-06-15 11:58:53 +0800 | [diff] [blame] | 613 | /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/ |
| 614 | target_flags |= IEEE80211_PREQ_TO_FLAG; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 615 | } |
| 616 | } |
| 617 | rcu_read_unlock(); |
| 618 | } |
| 619 | |
| 620 | if (reply) { |
| 621 | lifetime = PREQ_IE_LIFETIME(preq_elem); |
Javier Cardona | 45904f2 | 2010-12-03 09:20:40 +0100 | [diff] [blame] | 622 | ttl = ifmsh->mshcfg.element_ttl; |
Rui Paulo | 27db2e4 | 2009-11-09 23:46:45 +0000 | [diff] [blame] | 623 | if (ttl != 0) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 624 | mhwmp_dbg(sdata, "replying to the PREQ\n"); |
Thomas Pedersen | 3c26f1f | 2011-11-24 17:15:22 -0800 | [diff] [blame] | 625 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 626 | orig_sn, 0, target_addr, |
| 627 | target_sn, mgmt->sa, 0, ttl, |
Alexis Green | 5ec596c | 2015-06-09 16:20:24 -0700 | [diff] [blame] | 628 | lifetime, target_metric, 0, |
| 629 | sdata); |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 630 | } else { |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 631 | ifmsh->mshstats.dropped_frames_ttl++; |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 632 | } |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 633 | } |
| 634 | |
Chun-Yeow Yeoh | 94f9065 | 2012-01-21 01:02:16 +0800 | [diff] [blame] | 635 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 636 | u32 preq_id; |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 637 | u8 hopcount; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 638 | |
| 639 | ttl = PREQ_IE_TTL(preq_elem); |
| 640 | lifetime = PREQ_IE_LIFETIME(preq_elem); |
| 641 | if (ttl <= 1) { |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 642 | ifmsh->mshstats.dropped_frames_ttl++; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 643 | return; |
| 644 | } |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 645 | mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 646 | --ttl; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 647 | preq_id = PREQ_IE_PREQ_ID(preq_elem); |
| 648 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; |
Chun-Yeow Yeoh | 3d045a5 | 2012-02-28 22:00:06 +0800 | [diff] [blame] | 649 | da = (mpath && mpath->is_root) ? |
| 650 | mpath->rann_snd_addr : broadcast_addr; |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 651 | |
| 652 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { |
| 653 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); |
| 654 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
Chun-Yeow Yeoh | 3fbf4b71b | 2012-06-17 02:27:40 +0800 | [diff] [blame] | 655 | } |
| 656 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 657 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 658 | orig_sn, target_flags, target_addr, |
| 659 | target_sn, da, hopcount, ttl, lifetime, |
Alexis Green | 5ec596c | 2015-06-09 16:20:24 -0700 | [diff] [blame] | 660 | orig_metric, preq_id, sdata); |
Chun-Yeow Yeoh | 7d4e15b | 2012-05-04 14:57:50 +0800 | [diff] [blame] | 661 | if (!is_multicast_ether_addr(da)) |
| 662 | ifmsh->mshstats.fwded_unicast++; |
| 663 | else |
| 664 | ifmsh->mshstats.fwded_mcast++; |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 665 | ifmsh->mshstats.fwded_frames++; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 666 | } |
| 667 | } |
| 668 | |
| 669 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 670 | static inline struct sta_info * |
| 671 | next_hop_deref_protected(struct mesh_path *mpath) |
| 672 | { |
| 673 | return rcu_dereference_protected(mpath->next_hop, |
| 674 | lockdep_is_held(&mpath->state_lock)); |
| 675 | } |
| 676 | |
| 677 | |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 678 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 679 | struct ieee80211_mgmt *mgmt, |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 680 | const u8 *prep_elem, u32 metric) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 681 | { |
Chun-Yeow Yeoh | d665508 | 2012-03-02 02:03:19 +0800 | [diff] [blame] | 682 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 683 | struct mesh_path *mpath; |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 684 | const u8 *target_addr, *orig_addr; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 685 | u8 ttl, hopcount, flags; |
| 686 | u8 next_hop[ETH_ALEN]; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 687 | u32 target_sn, orig_sn, lifetime; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 688 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 689 | mhwmp_dbg(sdata, "received PREP from %pM\n", |
Chun-Yeow Yeoh | 0f71651 | 2013-04-03 17:49:53 +0800 | [diff] [blame] | 690 | PREP_IE_TARGET_ADDR(prep_elem)); |
Rui Paulo | dbb81c4 | 2009-11-09 23:46:46 +0000 | [diff] [blame] | 691 | |
Thomas Pedersen | 3c26f1f | 2011-11-24 17:15:22 -0800 | [diff] [blame] | 692 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 693 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 694 | /* destination, no forwarding required */ |
| 695 | return; |
| 696 | |
Chun-Yeow Yeoh | d665508 | 2012-03-02 02:03:19 +0800 | [diff] [blame] | 697 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
| 698 | return; |
| 699 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 700 | ttl = PREP_IE_TTL(prep_elem); |
| 701 | if (ttl <= 1) { |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 702 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 703 | return; |
| 704 | } |
| 705 | |
| 706 | rcu_read_lock(); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 707 | mpath = mesh_path_lookup(sdata, orig_addr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 708 | if (mpath) |
| 709 | spin_lock_bh(&mpath->state_lock); |
| 710 | else |
| 711 | goto fail; |
| 712 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { |
| 713 | spin_unlock_bh(&mpath->state_lock); |
| 714 | goto fail; |
| 715 | } |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 716 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 717 | spin_unlock_bh(&mpath->state_lock); |
| 718 | --ttl; |
| 719 | flags = PREP_IE_FLAGS(prep_elem); |
| 720 | lifetime = PREP_IE_LIFETIME(prep_elem); |
| 721 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; |
Thomas Pedersen | 3c26f1f | 2011-11-24 17:15:22 -0800 | [diff] [blame] | 722 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 723 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
| 724 | orig_sn = PREP_IE_ORIG_SN(prep_elem); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 725 | |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 726 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0, |
| 727 | target_addr, target_sn, next_hop, hopcount, |
| 728 | ttl, lifetime, metric, 0, sdata); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 729 | rcu_read_unlock(); |
Daniel Walker | c8a61a7 | 2009-08-18 10:59:00 -0700 | [diff] [blame] | 730 | |
| 731 | sdata->u.mesh.mshstats.fwded_unicast++; |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 732 | sdata->u.mesh.mshstats.fwded_frames++; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 733 | return; |
| 734 | |
| 735 | fail: |
| 736 | rcu_read_unlock(); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 737 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 738 | } |
| 739 | |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 740 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 741 | struct ieee80211_mgmt *mgmt, |
| 742 | const u8 *perr_elem) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 743 | { |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 744 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 745 | struct mesh_path *mpath; |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 746 | u8 ttl; |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 747 | const u8 *ta, *target_addr; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 748 | u32 target_sn; |
| 749 | u16 target_rcode; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 750 | |
| 751 | ta = mgmt->sa; |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 752 | ttl = PERR_IE_TTL(perr_elem); |
| 753 | if (ttl <= 1) { |
| 754 | ifmsh->mshstats.dropped_frames_ttl++; |
| 755 | return; |
| 756 | } |
| 757 | ttl--; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 758 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
| 759 | target_sn = PERR_IE_TARGET_SN(perr_elem); |
| 760 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 761 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 762 | rcu_read_lock(); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 763 | mpath = mesh_path_lookup(sdata, target_addr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 764 | if (mpath) { |
Felix Fietkau | 888d04d | 2012-03-01 15:22:09 +0100 | [diff] [blame] | 765 | struct sta_info *sta; |
| 766 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 767 | spin_lock_bh(&mpath->state_lock); |
Felix Fietkau | 888d04d | 2012-03-01 15:22:09 +0100 | [diff] [blame] | 768 | sta = next_hop_deref_protected(mpath); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 769 | if (mpath->flags & MESH_PATH_ACTIVE && |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 770 | ether_addr_equal(ta, sta->sta.addr) && |
Pedersen, Thomas | 5df20f2 | 2016-09-06 11:59:00 -0700 | [diff] [blame] | 771 | !(mpath->flags & MESH_PATH_FIXED) && |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 772 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
Alexis Green | 703ee73 | 2015-06-10 11:02:09 -0700 | [diff] [blame] | 773 | SN_GT(target_sn, mpath->sn) || target_sn == 0)) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 774 | mpath->flags &= ~MESH_PATH_ACTIVE; |
Alexis Green | 703ee73 | 2015-06-10 11:02:09 -0700 | [diff] [blame] | 775 | if (target_sn != 0) |
| 776 | mpath->sn = target_sn; |
| 777 | else |
| 778 | mpath->sn += 1; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 779 | spin_unlock_bh(&mpath->state_lock); |
Chun-Yeow Yeoh | d665508 | 2012-03-02 02:03:19 +0800 | [diff] [blame] | 780 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
| 781 | goto endperr; |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 782 | mesh_path_error_tx(sdata, ttl, target_addr, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 783 | target_sn, target_rcode, |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 784 | broadcast_addr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 785 | } else |
| 786 | spin_unlock_bh(&mpath->state_lock); |
| 787 | } |
Chun-Yeow Yeoh | d665508 | 2012-03-02 02:03:19 +0800 | [diff] [blame] | 788 | endperr: |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 789 | rcu_read_unlock(); |
| 790 | } |
| 791 | |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 792 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 793 | struct ieee80211_mgmt *mgmt, |
| 794 | const struct ieee80211_rann_ie *rann) |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 795 | { |
| 796 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
Chun-Yeow Yeoh | d2a079f | 2012-03-23 18:48:51 +0800 | [diff] [blame] | 797 | struct ieee80211_local *local = sdata->local; |
| 798 | struct sta_info *sta; |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 799 | struct mesh_path *mpath; |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 800 | u8 ttl, flags, hopcount; |
Johannes Berg | 4a3cb70 | 2013-02-12 16:43:19 +0100 | [diff] [blame] | 801 | const u8 *orig_addr; |
Chun-Yeow Yeoh | d2a079f | 2012-03-23 18:48:51 +0800 | [diff] [blame] | 802 | u32 orig_sn, metric, metric_txsta, interval; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 803 | bool root_is_gate; |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 804 | |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 805 | ttl = rann->rann_ttl; |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 806 | flags = rann->rann_flags; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 807 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 808 | orig_addr = rann->rann_addr; |
Chun-Yeow Yeoh | 292c41a | 2012-03-19 21:38:46 +0800 | [diff] [blame] | 809 | orig_sn = le32_to_cpu(rann->rann_seq); |
Chun-Yeow Yeoh | d2a079f | 2012-03-23 18:48:51 +0800 | [diff] [blame] | 810 | interval = le32_to_cpu(rann->rann_interval); |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 811 | hopcount = rann->rann_hopcount; |
Rui Paulo | a6a58b4 | 2009-11-09 23:46:51 +0000 | [diff] [blame] | 812 | hopcount++; |
Chun-Yeow Yeoh | 292c41a | 2012-03-19 21:38:46 +0800 | [diff] [blame] | 813 | metric = le32_to_cpu(rann->rann_metric); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 814 | |
| 815 | /* Ignore our own RANNs */ |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 816 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 817 | return; |
| 818 | |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 819 | mhwmp_dbg(sdata, |
| 820 | "received RANN from %pM via neighbour %pM (is_gate=%d)\n", |
| 821 | orig_addr, mgmt->sa, root_is_gate); |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 822 | |
| 823 | rcu_read_lock(); |
Chun-Yeow Yeoh | d2a079f | 2012-03-23 18:48:51 +0800 | [diff] [blame] | 824 | sta = sta_info_get(sdata, mgmt->sa); |
| 825 | if (!sta) { |
| 826 | rcu_read_unlock(); |
| 827 | return; |
| 828 | } |
| 829 | |
| 830 | metric_txsta = airtime_link_metric_get(local, sta); |
| 831 | |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 832 | mpath = mesh_path_lookup(sdata, orig_addr); |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 833 | if (!mpath) { |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 834 | mpath = mesh_path_add(sdata, orig_addr); |
| 835 | if (IS_ERR(mpath)) { |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 836 | rcu_read_unlock(); |
| 837 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
| 838 | return; |
| 839 | } |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 840 | } |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 841 | |
Chun-Yeow Yeoh | 7ebfa46 | 2012-06-15 10:20:02 +0800 | [diff] [blame] | 842 | if (!(SN_LT(mpath->sn, orig_sn)) && |
| 843 | !(mpath->sn == orig_sn && metric < mpath->rann_metric)) { |
| 844 | rcu_read_unlock(); |
| 845 | return; |
| 846 | } |
| 847 | |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 848 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
Chun-Yeow Yeoh | 728b19e | 2012-06-14 02:06:10 +0800 | [diff] [blame] | 849 | (time_after(jiffies, mpath->last_preq_to_root + |
| 850 | root_path_confirmation_jiffies(sdata)) || |
| 851 | time_before(jiffies, mpath->last_preq_to_root))) && |
Chun-Yeow Yeoh | 7ebfa46 | 2012-06-15 10:20:02 +0800 | [diff] [blame] | 852 | !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 853 | mhwmp_dbg(sdata, |
| 854 | "time to refresh root mpath %pM\n", |
| 855 | orig_addr); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 856 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
Chun-Yeow Yeoh | 728b19e | 2012-06-14 02:06:10 +0800 | [diff] [blame] | 857 | mpath->last_preq_to_root = jiffies; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 858 | } |
| 859 | |
Chun-Yeow Yeoh | 7ebfa46 | 2012-06-15 10:20:02 +0800 | [diff] [blame] | 860 | mpath->sn = orig_sn; |
| 861 | mpath->rann_metric = metric + metric_txsta; |
| 862 | mpath->is_root = true; |
| 863 | /* Recording RANNs sender address to send individually |
| 864 | * addressed PREQs destined for root mesh STA */ |
| 865 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); |
| 866 | |
| 867 | if (root_is_gate) |
| 868 | mesh_path_add_gate(mpath); |
| 869 | |
| 870 | if (ttl <= 1) { |
| 871 | ifmsh->mshstats.dropped_frames_ttl++; |
| 872 | rcu_read_unlock(); |
| 873 | return; |
| 874 | } |
| 875 | ttl--; |
| 876 | |
| 877 | if (ifmsh->mshcfg.dot11MeshForwarding) { |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 878 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 879 | orig_sn, 0, NULL, 0, broadcast_addr, |
| 880 | hopcount, ttl, interval, |
| 881 | metric + metric_txsta, 0, sdata); |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 882 | } |
Chun-Yeow Yeoh | 3d045a5 | 2012-02-28 22:00:06 +0800 | [diff] [blame] | 883 | |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 884 | rcu_read_unlock(); |
| 885 | } |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 886 | |
| 887 | |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 888 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 889 | struct ieee80211_mgmt *mgmt, size_t len) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 890 | { |
| 891 | struct ieee802_11_elems elems; |
| 892 | size_t baselen; |
Alexis Green | afd2efb | 2015-06-05 12:43:54 -0700 | [diff] [blame] | 893 | u32 path_metric; |
Javier Cardona | 9709131 | 2011-10-06 14:54:22 -0700 | [diff] [blame] | 894 | struct sta_info *sta; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 895 | |
Johannes Berg | 9c80d3d | 2008-09-08 15:41:59 +0200 | [diff] [blame] | 896 | /* need action_code */ |
| 897 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
| 898 | return; |
| 899 | |
Javier Cardona | 9709131 | 2011-10-06 14:54:22 -0700 | [diff] [blame] | 900 | rcu_read_lock(); |
| 901 | sta = sta_info_get(sdata, mgmt->sa); |
Johannes Berg | 433f5bc | 2015-06-17 10:31:00 +0200 | [diff] [blame] | 902 | if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { |
Javier Cardona | 9709131 | 2011-10-06 14:54:22 -0700 | [diff] [blame] | 903 | rcu_read_unlock(); |
| 904 | return; |
| 905 | } |
| 906 | rcu_read_unlock(); |
| 907 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 908 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
| 909 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, |
Johannes Berg | b2e506b | 2013-03-26 14:54:16 +0100 | [diff] [blame] | 910 | len - baselen, false, &elems); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 911 | |
Rui Paulo | dbb81c4 | 2009-11-09 23:46:46 +0000 | [diff] [blame] | 912 | if (elems.preq) { |
| 913 | if (elems.preq_len != 37) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 914 | /* Right now we support just 1 destination and no AE */ |
| 915 | return; |
Alexis Green | afd2efb | 2015-06-05 12:43:54 -0700 | [diff] [blame] | 916 | path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
| 917 | MPATH_PREQ); |
| 918 | if (path_metric) |
Rui Paulo | dbb81c4 | 2009-11-09 23:46:46 +0000 | [diff] [blame] | 919 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, |
Alexis Green | afd2efb | 2015-06-05 12:43:54 -0700 | [diff] [blame] | 920 | path_metric); |
Rui Paulo | dbb81c4 | 2009-11-09 23:46:46 +0000 | [diff] [blame] | 921 | } |
| 922 | if (elems.prep) { |
| 923 | if (elems.prep_len != 31) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 924 | /* Right now we support no AE */ |
| 925 | return; |
Alexis Green | afd2efb | 2015-06-05 12:43:54 -0700 | [diff] [blame] | 926 | path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
| 927 | MPATH_PREP); |
| 928 | if (path_metric) |
Rui Paulo | dbb81c4 | 2009-11-09 23:46:46 +0000 | [diff] [blame] | 929 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, |
Alexis Green | afd2efb | 2015-06-05 12:43:54 -0700 | [diff] [blame] | 930 | path_metric); |
Rui Paulo | dbb81c4 | 2009-11-09 23:46:46 +0000 | [diff] [blame] | 931 | } |
| 932 | if (elems.perr) { |
Rui Paulo | d611f06 | 2009-11-09 23:46:50 +0000 | [diff] [blame] | 933 | if (elems.perr_len != 15) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 934 | /* Right now we support only one destination per PERR */ |
| 935 | return; |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 936 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 937 | } |
Rui Paulo | 90a5e16 | 2009-11-11 00:01:31 +0000 | [diff] [blame] | 938 | if (elems.rann) |
| 939 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 940 | } |
| 941 | |
| 942 | /** |
| 943 | * mesh_queue_preq - queue a PREQ to a given destination |
| 944 | * |
| 945 | * @mpath: mesh path to discover |
| 946 | * @flags: special attributes of the PREQ to be sent |
| 947 | * |
| 948 | * Locking: the function must be called from within a rcu read lock block. |
| 949 | * |
| 950 | */ |
| 951 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) |
| 952 | { |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 953 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 954 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 955 | struct mesh_preq_queue *preq_node; |
| 956 | |
Andrey Yurovsky | 59615b5 | 2009-06-25 16:07:42 -0700 | [diff] [blame] | 957 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 958 | if (!preq_node) { |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 959 | mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 960 | return; |
| 961 | } |
| 962 | |
Baruch Siach | 987dafa | 2011-07-28 08:51:05 +0300 | [diff] [blame] | 963 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 964 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
Baruch Siach | 987dafa | 2011-07-28 08:51:05 +0300 | [diff] [blame] | 965 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 966 | kfree(preq_node); |
| 967 | if (printk_ratelimit()) |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 968 | mhwmp_dbg(sdata, "PREQ node queue full\n"); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 969 | return; |
| 970 | } |
| 971 | |
Johannes Berg | f2dc798 | 2011-11-18 15:27:31 +0100 | [diff] [blame] | 972 | spin_lock(&mpath->state_lock); |
Javier Cardona | f3011cf | 2011-11-03 21:11:10 -0700 | [diff] [blame] | 973 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
Johannes Berg | f2dc798 | 2011-11-18 15:27:31 +0100 | [diff] [blame] | 974 | spin_unlock(&mpath->state_lock); |
Javier Cardona | f3011cf | 2011-11-03 21:11:10 -0700 | [diff] [blame] | 975 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
Dan Carpenter | 88d5346 | 2011-11-15 09:33:31 +0300 | [diff] [blame] | 976 | kfree(preq_node); |
Javier Cardona | f3011cf | 2011-11-03 21:11:10 -0700 | [diff] [blame] | 977 | return; |
| 978 | } |
| 979 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 980 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
| 981 | preq_node->flags = flags; |
| 982 | |
Javier Cardona | f3011cf | 2011-11-03 21:11:10 -0700 | [diff] [blame] | 983 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
Johannes Berg | f2dc798 | 2011-11-18 15:27:31 +0100 | [diff] [blame] | 984 | spin_unlock(&mpath->state_lock); |
Javier Cardona | f3011cf | 2011-11-03 21:11:10 -0700 | [diff] [blame] | 985 | |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 986 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
| 987 | ++ifmsh->preq_queue_len; |
Baruch Siach | 987dafa | 2011-07-28 08:51:05 +0300 | [diff] [blame] | 988 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 989 | |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 990 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
Johannes Berg | 64592c8 | 2010-06-10 10:21:31 +0200 | [diff] [blame] | 991 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 992 | |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 993 | else if (time_before(jiffies, ifmsh->last_preq)) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 994 | /* avoid long wait if did not send preqs for a long time |
| 995 | * and jiffies wrapped around |
| 996 | */ |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 997 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
Johannes Berg | 64592c8 | 2010-06-10 10:21:31 +0200 | [diff] [blame] | 998 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 999 | } else |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 1000 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1001 | min_preq_int_jiff(sdata)); |
| 1002 | } |
| 1003 | |
| 1004 | /** |
| 1005 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue |
| 1006 | * |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 1007 | * @sdata: local mesh subif |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1008 | */ |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 1009 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1010 | { |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 1011 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1012 | struct mesh_preq_queue *preq_node; |
| 1013 | struct mesh_path *mpath; |
Chun-Yeow Yeoh | 932e628 | 2015-06-15 11:58:53 +0800 | [diff] [blame] | 1014 | u8 ttl, target_flags = 0; |
Chun-Yeow Yeoh | 3d045a5 | 2012-02-28 22:00:06 +0800 | [diff] [blame] | 1015 | const u8 *da; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1016 | u32 lifetime; |
| 1017 | |
Johannes Berg | a43816d | 2009-07-10 11:39:26 +0200 | [diff] [blame] | 1018 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 1019 | if (!ifmsh->preq_queue_len || |
| 1020 | time_before(jiffies, ifmsh->last_preq + |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1021 | min_preq_int_jiff(sdata))) { |
Johannes Berg | a43816d | 2009-07-10 11:39:26 +0200 | [diff] [blame] | 1022 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1023 | return; |
| 1024 | } |
| 1025 | |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 1026 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1027 | struct mesh_preq_queue, list); |
| 1028 | list_del(&preq_node->list); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 1029 | --ifmsh->preq_queue_len; |
Johannes Berg | a43816d | 2009-07-10 11:39:26 +0200 | [diff] [blame] | 1030 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1031 | |
| 1032 | rcu_read_lock(); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1033 | mpath = mesh_path_lookup(sdata, preq_node->dst); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1034 | if (!mpath) |
| 1035 | goto enddiscovery; |
| 1036 | |
| 1037 | spin_lock_bh(&mpath->state_lock); |
Pedersen, Thomas | 5df20f2 | 2016-09-06 11:59:00 -0700 | [diff] [blame] | 1038 | if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) { |
Bob Copeland | 7493295 | 2016-03-18 22:03:24 -0400 | [diff] [blame] | 1039 | spin_unlock_bh(&mpath->state_lock); |
| 1040 | goto enddiscovery; |
| 1041 | } |
Javier Cardona | f3011cf | 2011-11-03 21:11:10 -0700 | [diff] [blame] | 1042 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1043 | if (preq_node->flags & PREQ_Q_F_START) { |
| 1044 | if (mpath->flags & MESH_PATH_RESOLVING) { |
| 1045 | spin_unlock_bh(&mpath->state_lock); |
| 1046 | goto enddiscovery; |
| 1047 | } else { |
| 1048 | mpath->flags &= ~MESH_PATH_RESOLVED; |
| 1049 | mpath->flags |= MESH_PATH_RESOLVING; |
| 1050 | mpath->discovery_retries = 0; |
| 1051 | mpath->discovery_timeout = disc_timeout_jiff(sdata); |
| 1052 | } |
| 1053 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || |
| 1054 | mpath->flags & MESH_PATH_RESOLVED) { |
| 1055 | mpath->flags &= ~MESH_PATH_RESOLVING; |
| 1056 | spin_unlock_bh(&mpath->state_lock); |
| 1057 | goto enddiscovery; |
| 1058 | } |
| 1059 | |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 1060 | ifmsh->last_preq = jiffies; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1061 | |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 1062 | if (time_after(jiffies, ifmsh->last_sn_update + |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1063 | net_traversal_jiffies(sdata)) || |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 1064 | time_before(jiffies, ifmsh->last_sn_update)) { |
| 1065 | ++ifmsh->sn; |
| 1066 | sdata->u.mesh.last_sn_update = jiffies; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1067 | } |
| 1068 | lifetime = default_lifetime(sdata); |
Javier Cardona | 45904f2 | 2010-12-03 09:20:40 +0100 | [diff] [blame] | 1069 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1070 | if (ttl == 0) { |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 1071 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1072 | spin_unlock_bh(&mpath->state_lock); |
| 1073 | goto enddiscovery; |
| 1074 | } |
| 1075 | |
| 1076 | if (preq_node->flags & PREQ_Q_F_REFRESH) |
Chun-Yeow Yeoh | 932e628 | 2015-06-15 11:58:53 +0800 | [diff] [blame] | 1077 | target_flags |= IEEE80211_PREQ_TO_FLAG; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1078 | else |
Chun-Yeow Yeoh | 932e628 | 2015-06-15 11:58:53 +0800 | [diff] [blame] | 1079 | target_flags &= ~IEEE80211_PREQ_TO_FLAG; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1080 | |
| 1081 | spin_unlock_bh(&mpath->state_lock); |
Chun-Yeow Yeoh | 3d045a5 | 2012-02-28 22:00:06 +0800 | [diff] [blame] | 1082 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 1083 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, |
| 1084 | target_flags, mpath->dst, mpath->sn, da, 0, |
| 1085 | ttl, lifetime, 0, ifmsh->preq_id++, sdata); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1086 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
| 1087 | |
| 1088 | enddiscovery: |
| 1089 | rcu_read_unlock(); |
| 1090 | kfree(preq_node); |
| 1091 | } |
| 1092 | |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1093 | /** |
| 1094 | * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1095 | * |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1096 | * @skb: 802.11 frame to be sent |
Jasper Bryant-Greene | f698d85 | 2008-08-03 12:04:37 +1200 | [diff] [blame] | 1097 | * @sdata: network subif the frame will be sent through |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1098 | * |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1099 | * Lookup next hop for given skb and start path discovery if no |
| 1100 | * forwarding information is found. |
| 1101 | * |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1102 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
| 1103 | * skb is freeed here if no mpath could be allocated. |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1104 | */ |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1105 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
| 1106 | struct sk_buff *skb) |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1107 | { |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1108 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1109 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| 1110 | struct mesh_path *mpath; |
| 1111 | struct sk_buff *skb_to_free = NULL; |
Rui Paulo | d19b3bf | 2009-11-09 23:46:55 +0000 | [diff] [blame] | 1112 | u8 *target_addr = hdr->addr3; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1113 | int err = 0; |
| 1114 | |
Marco Porsch | 3f52b7e | 2013-01-30 18:14:08 +0100 | [diff] [blame] | 1115 | /* Nulls are only sent to peers for PS and should be pre-addressed */ |
| 1116 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) |
| 1117 | return 0; |
| 1118 | |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1119 | rcu_read_lock(); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1120 | err = mesh_nexthop_lookup(sdata, skb); |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1121 | if (!err) |
| 1122 | goto endlookup; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1123 | |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1124 | /* no nexthop found, start resolving */ |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1125 | mpath = mesh_path_lookup(sdata, target_addr); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1126 | if (!mpath) { |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 1127 | mpath = mesh_path_add(sdata, target_addr); |
| 1128 | if (IS_ERR(mpath)) { |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1129 | mesh_path_discard_frame(sdata, skb); |
Bob Copeland | ae76eef | 2013-03-29 09:38:39 -0400 | [diff] [blame] | 1130 | err = PTR_ERR(mpath); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1131 | goto endlookup; |
| 1132 | } |
| 1133 | } |
| 1134 | |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1135 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
| 1136 | mesh_queue_preq(mpath, PREQ_Q_F_START); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1137 | |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1138 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) |
| 1139 | skb_to_free = skb_dequeue(&mpath->frame_queue); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1140 | |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1141 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
| 1142 | ieee80211_set_qos_hdr(sdata, skb); |
| 1143 | skb_queue_tail(&mpath->frame_queue, skb); |
| 1144 | err = -ENOENT; |
| 1145 | if (skb_to_free) |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1146 | mesh_path_discard_frame(sdata, skb_to_free); |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1147 | |
| 1148 | endlookup: |
| 1149 | rcu_read_unlock(); |
| 1150 | return err; |
| 1151 | } |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1152 | |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1153 | /** |
| 1154 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling |
| 1155 | * this function is considered "using" the associated mpath, so preempt a path |
| 1156 | * refresh if this mpath expires soon. |
| 1157 | * |
| 1158 | * @skb: 802.11 frame to be sent |
| 1159 | * @sdata: network subif the frame will be sent through |
| 1160 | * |
| 1161 | * Returns: 0 if the next hop was found. Nonzero otherwise. |
| 1162 | */ |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1163 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
| 1164 | struct sk_buff *skb) |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1165 | { |
| 1166 | struct mesh_path *mpath; |
| 1167 | struct sta_info *next_hop; |
| 1168 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 1169 | u8 *target_addr = hdr->addr3; |
| 1170 | int err = -ENOENT; |
| 1171 | |
| 1172 | rcu_read_lock(); |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1173 | mpath = mesh_path_lookup(sdata, target_addr); |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1174 | |
| 1175 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) |
| 1176 | goto endlookup; |
| 1177 | |
| 1178 | if (time_after(jiffies, |
| 1179 | mpath->exp_time - |
| 1180 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && |
Joe Perches | b203ca3 | 2012-05-08 18:56:52 +0000 | [diff] [blame] | 1181 | ether_addr_equal(sdata->vif.addr, hdr->addr4) && |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1182 | !(mpath->flags & MESH_PATH_RESOLVING) && |
| 1183 | !(mpath->flags & MESH_PATH_FIXED)) |
| 1184 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
| 1185 | |
| 1186 | next_hop = rcu_dereference(mpath->next_hop); |
| 1187 | if (next_hop) { |
| 1188 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); |
| 1189 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); |
Marco Porsch | 3f52b7e | 2013-01-30 18:14:08 +0100 | [diff] [blame] | 1190 | ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); |
Thomas Pedersen | 0cfda85 | 2011-11-24 17:15:25 -0800 | [diff] [blame] | 1191 | err = 0; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1192 | } |
| 1193 | |
| 1194 | endlookup: |
| 1195 | rcu_read_unlock(); |
| 1196 | return err; |
| 1197 | } |
| 1198 | |
| 1199 | void mesh_path_timer(unsigned long data) |
| 1200 | { |
Johannes Berg | dea4096 | 2011-05-12 15:03:32 +0200 | [diff] [blame] | 1201 | struct mesh_path *mpath = (void *) data; |
| 1202 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1203 | int ret; |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1204 | |
Johannes Berg | dea4096 | 2011-05-12 15:03:32 +0200 | [diff] [blame] | 1205 | if (sdata->local->quiescing) |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 1206 | return; |
Johannes Berg | 5bb644a | 2009-05-17 11:40:42 +0200 | [diff] [blame] | 1207 | |
| 1208 | spin_lock_bh(&mpath->state_lock); |
Luis Carlos Cobo | cfa22c7 | 2008-02-29 15:04:13 -0800 | [diff] [blame] | 1209 | if (mpath->flags & MESH_PATH_RESOLVED || |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1210 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1211 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1212 | spin_unlock_bh(&mpath->state_lock); |
| 1213 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1214 | ++mpath->discovery_retries; |
| 1215 | mpath->discovery_timeout *= 2; |
Javier Cardona | f3011cf | 2011-11-03 21:11:10 -0700 | [diff] [blame] | 1216 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1217 | spin_unlock_bh(&mpath->state_lock); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1218 | mesh_queue_preq(mpath, 0); |
| 1219 | } else { |
Jesse Jones | d825471 | 2015-06-12 14:13:09 -0700 | [diff] [blame] | 1220 | mpath->flags &= ~(MESH_PATH_RESOLVING | |
| 1221 | MESH_PATH_RESOLVED | |
| 1222 | MESH_PATH_REQ_QUEUED); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1223 | mpath->exp_time = jiffies; |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1224 | spin_unlock_bh(&mpath->state_lock); |
| 1225 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { |
| 1226 | ret = mesh_path_send_to_gates(mpath); |
| 1227 | if (ret) |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 1228 | mhwmp_dbg(sdata, "no gate was reachable\n"); |
Javier Cardona | 5ee68e5 | 2011-08-09 16:45:08 -0700 | [diff] [blame] | 1229 | } else |
| 1230 | mesh_path_flush_pending(mpath); |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1231 | } |
Luis Carlos Cobo | 050ac52 | 2008-02-23 15:17:15 +0100 | [diff] [blame] | 1232 | } |
Rui Paulo | e304bfd | 2009-11-09 23:46:56 +0000 | [diff] [blame] | 1233 | |
Johannes Berg | bf7cd94 | 2013-02-15 14:40:31 +0100 | [diff] [blame] | 1234 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) |
Rui Paulo | e304bfd | 2009-11-09 23:46:56 +0000 | [diff] [blame] | 1235 | { |
| 1236 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
Javier Cardona | 0507e15 | 2011-08-09 16:45:10 -0700 | [diff] [blame] | 1237 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
Chun-Yeow Yeoh | a69cc44 | 2012-06-14 02:06:07 +0800 | [diff] [blame] | 1238 | u8 flags, target_flags = 0; |
Rui Paulo | e304bfd | 2009-11-09 23:46:56 +0000 | [diff] [blame] | 1239 | |
Javier Cardona | 16dd726 | 2011-08-09 16:45:11 -0700 | [diff] [blame] | 1240 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
| 1241 | ? RANN_FLAG_IS_GATE : 0; |
Chun-Yeow Yeoh | a69cc44 | 2012-06-14 02:06:07 +0800 | [diff] [blame] | 1242 | |
| 1243 | switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { |
| 1244 | case IEEE80211_PROACTIVE_RANN: |
| 1245 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 1246 | ++ifmsh->sn, 0, NULL, 0, broadcast_addr, |
| 1247 | 0, ifmsh->mshcfg.element_ttl, |
| 1248 | interval, 0, 0, sdata); |
Chun-Yeow Yeoh | a69cc44 | 2012-06-14 02:06:07 +0800 | [diff] [blame] | 1249 | break; |
| 1250 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: |
| 1251 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; |
| 1252 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: |
| 1253 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; |
| 1254 | target_flags |= IEEE80211_PREQ_TO_FLAG | |
| 1255 | IEEE80211_PREQ_USN_FLAG; |
| 1256 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, |
Chun-Yeow Yeoh | f63f842 | 2013-11-13 15:39:12 +0800 | [diff] [blame] | 1257 | ++ifmsh->sn, target_flags, |
| 1258 | (u8 *) broadcast_addr, 0, broadcast_addr, |
| 1259 | 0, ifmsh->mshcfg.element_ttl, interval, |
| 1260 | 0, ifmsh->preq_id++, sdata); |
Chun-Yeow Yeoh | a69cc44 | 2012-06-14 02:06:07 +0800 | [diff] [blame] | 1261 | break; |
| 1262 | default: |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 1263 | mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
Chun-Yeow Yeoh | a69cc44 | 2012-06-14 02:06:07 +0800 | [diff] [blame] | 1264 | return; |
| 1265 | } |
Rui Paulo | e304bfd | 2009-11-09 23:46:56 +0000 | [diff] [blame] | 1266 | } |