![Patrick McHardy](/assets/img/avatar_default.png)
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
855 lines
24 KiB
C
855 lines
24 KiB
C
/*
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* Copyright (c) 2008 open80211s Ltd.
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* Author: Luis Carlos Cobo <luisca@cozybit.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "mesh.h"
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#define TEST_FRAME_LEN 8192
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#define MAX_METRIC 0xffffffff
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#define ARITH_SHIFT 8
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/* Number of frames buffered per destination for unresolved destinations */
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#define MESH_FRAME_QUEUE_LEN 10
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#define MAX_PREQ_QUEUE_LEN 64
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/* Destination only */
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#define MP_F_DO 0x1
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/* Reply and forward */
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#define MP_F_RF 0x2
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static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae)
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{
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if (ae)
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offset += 6;
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return le32_to_cpu(get_unaligned((__le32 *) (preq_elem + offset)));
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}
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/* HWMP IE processing macros */
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#define AE_F (1<<6)
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#define AE_F_SET(x) (*x & AE_F)
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#define PREQ_IE_FLAGS(x) (*(x))
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#define PREQ_IE_HOPCOUNT(x) (*(x + 1))
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#define PREQ_IE_TTL(x) (*(x + 2))
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#define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
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#define PREQ_IE_ORIG_ADDR(x) (x + 7)
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#define PREQ_IE_ORIG_DSN(x) u32_field_get(x, 13, 0);
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#define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x));
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#define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x));
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#define PREQ_IE_DST_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
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#define PREQ_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
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#define PREQ_IE_DST_DSN(x) u32_field_get(x, 33, AE_F_SET(x));
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#define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
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#define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
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#define PREP_IE_TTL(x) PREQ_IE_TTL(x)
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#define PREP_IE_ORIG_ADDR(x) (x + 3)
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#define PREP_IE_ORIG_DSN(x) u32_field_get(x, 9, 0);
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#define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x));
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#define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x));
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#define PREP_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
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#define PREP_IE_DST_DSN(x) u32_field_get(x, 27, AE_F_SET(x));
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#define PERR_IE_DST_ADDR(x) (x + 2)
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#define PERR_IE_DST_DSN(x) u32_field_get(x, 8, 0);
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#define TU_TO_EXP_TIME(x) (jiffies + msecs_to_jiffies(x * 1024 / 1000))
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#define MSEC_TO_TU(x) (x*1000/1024)
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#define DSN_GT(x, y) ((long) (y) - (long) (x) < 0)
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#define DSN_LT(x, y) ((long) (x) - (long) (y) < 0)
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#define net_traversal_jiffies(s) \
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msecs_to_jiffies(s->u.sta.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
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#define default_lifetime(s) \
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MSEC_TO_TU(s->u.sta.mshcfg.dot11MeshHWMPactivePathTimeout)
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#define min_preq_int_jiff(s) \
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(msecs_to_jiffies(s->u.sta.mshcfg.dot11MeshHWMPpreqMinInterval))
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#define max_preq_retries(s) (s->u.sta.mshcfg.dot11MeshHWMPmaxPREQretries)
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#define disc_timeout_jiff(s) \
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msecs_to_jiffies(sdata->u.sta.mshcfg.min_discovery_timeout)
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enum mpath_frame_type {
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MPATH_PREQ = 0,
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MPATH_PREP,
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MPATH_PERR
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};
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static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
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u8 *orig_addr, __le32 orig_dsn, u8 dst_flags, u8 *dst,
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__le32 dst_dsn, u8 *da, u8 hop_count, u8 ttl, __le32 lifetime,
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__le32 metric, __le32 preq_id, struct net_device *dev)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
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struct ieee80211_mgmt *mgmt;
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u8 *pos;
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int ie_len;
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if (!skb)
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return -1;
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skb_reserve(skb, local->hw.extra_tx_headroom);
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/* 25 is the size of the common mgmt part (24) plus the size of the
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* common action part (1)
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*/
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mgmt = (struct ieee80211_mgmt *)
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skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
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memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
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mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
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IEEE80211_STYPE_ACTION);
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memcpy(mgmt->da, da, ETH_ALEN);
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memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
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/* BSSID is left zeroed, wildcard value */
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mgmt->u.action.category = MESH_PATH_SEL_CATEGORY;
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mgmt->u.action.u.mesh_action.action_code = action;
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switch (action) {
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case MPATH_PREQ:
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ie_len = 37;
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pos = skb_put(skb, 2 + ie_len);
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*pos++ = WLAN_EID_PREQ;
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break;
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case MPATH_PREP:
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ie_len = 31;
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pos = skb_put(skb, 2 + ie_len);
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*pos++ = WLAN_EID_PREP;
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break;
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default:
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kfree_skb(skb);
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return -ENOTSUPP;
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break;
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}
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*pos++ = ie_len;
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*pos++ = flags;
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*pos++ = hop_count;
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*pos++ = ttl;
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if (action == MPATH_PREQ) {
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memcpy(pos, &preq_id, 4);
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pos += 4;
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}
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memcpy(pos, orig_addr, ETH_ALEN);
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pos += ETH_ALEN;
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memcpy(pos, &orig_dsn, 4);
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pos += 4;
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memcpy(pos, &lifetime, 4);
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pos += 4;
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memcpy(pos, &metric, 4);
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pos += 4;
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if (action == MPATH_PREQ) {
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/* destination count */
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*pos++ = 1;
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*pos++ = dst_flags;
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}
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memcpy(pos, dst, ETH_ALEN);
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pos += ETH_ALEN;
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memcpy(pos, &dst_dsn, 4);
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ieee80211_sta_tx(dev, skb, 0);
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return 0;
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}
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/**
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* mesh_send_path error - Sends a PERR mesh management frame
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*
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* @dst: broken destination
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* @dst_dsn: dsn of the broken destination
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* @ra: node this frame is addressed to
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*/
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int mesh_path_error_tx(u8 *dst, __le32 dst_dsn, u8 *ra,
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struct net_device *dev)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
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struct ieee80211_mgmt *mgmt;
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u8 *pos;
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int ie_len;
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if (!skb)
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return -1;
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skb_reserve(skb, local->hw.extra_tx_headroom);
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/* 25 is the size of the common mgmt part (24) plus the size of the
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* common action part (1)
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*/
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mgmt = (struct ieee80211_mgmt *)
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skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
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memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
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mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
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IEEE80211_STYPE_ACTION);
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memcpy(mgmt->da, ra, ETH_ALEN);
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memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
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/* BSSID is left zeroed, wildcard value */
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mgmt->u.action.category = MESH_PATH_SEL_CATEGORY;
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mgmt->u.action.u.mesh_action.action_code = MPATH_PERR;
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ie_len = 12;
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pos = skb_put(skb, 2 + ie_len);
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*pos++ = WLAN_EID_PERR;
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*pos++ = ie_len;
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/* mode flags, reserved */
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*pos++ = 0;
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/* number of destinations */
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*pos++ = 1;
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memcpy(pos, dst, ETH_ALEN);
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pos += ETH_ALEN;
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memcpy(pos, &dst_dsn, 4);
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ieee80211_sta_tx(dev, skb, 0);
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return 0;
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}
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static u32 airtime_link_metric_get(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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struct ieee80211_supported_band *sband;
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/* This should be adjusted for each device */
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int device_constant = 1 << ARITH_SHIFT;
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int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
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int s_unit = 1 << ARITH_SHIFT;
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int rate, err;
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u32 tx_time, estimated_retx;
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u64 result;
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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if (sta->fail_avg >= 100)
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return MAX_METRIC;
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err = (sta->fail_avg << ARITH_SHIFT) / 100;
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/* bitrate is in units of 100 Kbps, while we need rate in units of
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* 1Mbps. This will be corrected on tx_time computation.
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*/
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rate = sband->bitrates[sta->txrate_idx].bitrate;
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tx_time = (device_constant + 10 * test_frame_len / rate);
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estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
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result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
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return (u32)result;
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}
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/**
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* hwmp_route_info_get - Update routing info to originator and transmitter
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*
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* @dev: local mesh interface
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* @mgmt: mesh management frame
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* @hwmp_ie: hwmp information element (PREP or PREQ)
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*
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* This function updates the path routing information to the originator and the
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* transmitter of a HWMP PREQ or PREP fram.
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*
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* Returns: metric to frame originator or 0 if the frame should not be further
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* processed
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*
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* Notes: this function is the only place (besides user-provided info) where
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* path routing information is updated.
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*/
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static u32 hwmp_route_info_get(struct net_device *dev,
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struct ieee80211_mgmt *mgmt,
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u8 *hwmp_ie)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct mesh_path *mpath;
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struct sta_info *sta;
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bool fresh_info;
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u8 *orig_addr, *ta;
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u32 orig_dsn, orig_metric;
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unsigned long orig_lifetime, exp_time;
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u32 last_hop_metric, new_metric;
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bool process = true;
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u8 action = mgmt->u.action.u.mesh_action.action_code;
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rcu_read_lock();
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sta = sta_info_get(local, mgmt->sa);
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if (!sta) {
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rcu_read_unlock();
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return 0;
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}
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last_hop_metric = airtime_link_metric_get(local, sta);
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/* Update and check originator routing info */
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fresh_info = true;
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switch (action) {
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case MPATH_PREQ:
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orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
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orig_dsn = PREQ_IE_ORIG_DSN(hwmp_ie);
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orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
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orig_metric = PREQ_IE_METRIC(hwmp_ie);
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break;
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case MPATH_PREP:
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/* Originator here refers to the MP that was the destination in
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* the Path Request. The draft refers to that MP as the
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* destination address, even though usually it is the origin of
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* the PREP frame. We divert from the nomenclature in the draft
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* so that we can easily use a single function to gather path
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* information from both PREQ and PREP frames.
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*/
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orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie);
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orig_dsn = PREP_IE_ORIG_DSN(hwmp_ie);
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orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
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orig_metric = PREP_IE_METRIC(hwmp_ie);
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break;
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default:
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rcu_read_unlock();
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return 0;
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}
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new_metric = orig_metric + last_hop_metric;
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if (new_metric < orig_metric)
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new_metric = MAX_METRIC;
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exp_time = TU_TO_EXP_TIME(orig_lifetime);
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if (memcmp(orig_addr, dev->dev_addr, ETH_ALEN) == 0) {
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/* This MP is the originator, we are not interested in this
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* frame, except for updating transmitter's path info.
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*/
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process = false;
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fresh_info = false;
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} else {
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mpath = mesh_path_lookup(orig_addr, dev);
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if (mpath) {
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spin_lock_bh(&mpath->state_lock);
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if (mpath->flags & MESH_PATH_FIXED)
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fresh_info = false;
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else if ((mpath->flags & MESH_PATH_ACTIVE) &&
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(mpath->flags & MESH_PATH_DSN_VALID)) {
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if (DSN_GT(mpath->dsn, orig_dsn) ||
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(mpath->dsn == orig_dsn &&
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action == MPATH_PREQ &&
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new_metric > mpath->metric)) {
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process = false;
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fresh_info = false;
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}
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}
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} else {
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mesh_path_add(orig_addr, dev);
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mpath = mesh_path_lookup(orig_addr, dev);
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if (!mpath) {
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rcu_read_unlock();
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return 0;
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}
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spin_lock_bh(&mpath->state_lock);
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}
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if (fresh_info) {
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mesh_path_assign_nexthop(mpath, sta);
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mpath->flags |= MESH_PATH_DSN_VALID;
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mpath->metric = new_metric;
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mpath->dsn = orig_dsn;
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mpath->exp_time = time_after(mpath->exp_time, exp_time)
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? mpath->exp_time : exp_time;
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mesh_path_activate(mpath);
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spin_unlock_bh(&mpath->state_lock);
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mesh_path_tx_pending(mpath);
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/* draft says preq_id should be saved to, but there does
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* not seem to be any use for it, skipping by now
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*/
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} else
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spin_unlock_bh(&mpath->state_lock);
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}
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/* Update and check transmitter routing info */
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ta = mgmt->sa;
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if (memcmp(orig_addr, ta, ETH_ALEN) == 0)
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fresh_info = false;
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else {
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fresh_info = true;
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mpath = mesh_path_lookup(ta, dev);
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if (mpath) {
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spin_lock_bh(&mpath->state_lock);
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if ((mpath->flags & MESH_PATH_FIXED) ||
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((mpath->flags & MESH_PATH_ACTIVE) &&
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(last_hop_metric > mpath->metric)))
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fresh_info = false;
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} else {
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mesh_path_add(ta, dev);
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mpath = mesh_path_lookup(ta, dev);
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if (!mpath) {
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rcu_read_unlock();
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return 0;
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}
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spin_lock_bh(&mpath->state_lock);
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}
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if (fresh_info) {
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mesh_path_assign_nexthop(mpath, sta);
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mpath->flags &= ~MESH_PATH_DSN_VALID;
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mpath->metric = last_hop_metric;
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mpath->exp_time = time_after(mpath->exp_time, exp_time)
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? mpath->exp_time : exp_time;
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mesh_path_activate(mpath);
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spin_unlock_bh(&mpath->state_lock);
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mesh_path_tx_pending(mpath);
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} else
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spin_unlock_bh(&mpath->state_lock);
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}
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rcu_read_unlock();
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return process ? new_metric : 0;
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}
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static void hwmp_preq_frame_process(struct net_device *dev,
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struct ieee80211_mgmt *mgmt,
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u8 *preq_elem, u32 metric) {
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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struct ieee80211_if_sta *ifsta = &sdata->u.sta;
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struct mesh_path *mpath;
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u8 *dst_addr, *orig_addr;
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u8 dst_flags, ttl;
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u32 orig_dsn, dst_dsn, lifetime;
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bool reply = false;
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bool forward = true;
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/* Update destination DSN, if present */
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dst_addr = PREQ_IE_DST_ADDR(preq_elem);
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orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
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dst_dsn = PREQ_IE_DST_DSN(preq_elem);
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orig_dsn = PREQ_IE_ORIG_DSN(preq_elem);
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dst_flags = PREQ_IE_DST_F(preq_elem);
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if (memcmp(dst_addr, dev->dev_addr, ETH_ALEN) == 0) {
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forward = false;
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reply = true;
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metric = 0;
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if (time_after(jiffies, ifsta->last_dsn_update +
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net_traversal_jiffies(sdata)) ||
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time_before(jiffies, ifsta->last_dsn_update)) {
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dst_dsn = ++ifsta->dsn;
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ifsta->last_dsn_update = jiffies;
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}
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} else {
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rcu_read_lock();
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mpath = mesh_path_lookup(dst_addr, dev);
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if (mpath) {
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if ((!(mpath->flags & MESH_PATH_DSN_VALID)) ||
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DSN_LT(mpath->dsn, dst_dsn)) {
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mpath->dsn = dst_dsn;
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mpath->flags &= MESH_PATH_DSN_VALID;
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} else if ((!(dst_flags & MP_F_DO)) &&
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(mpath->flags & MESH_PATH_ACTIVE)) {
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reply = true;
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metric = mpath->metric;
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dst_dsn = mpath->dsn;
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if (dst_flags & MP_F_RF)
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dst_flags |= MP_F_DO;
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else
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forward = false;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
if (reply) {
|
|
lifetime = PREQ_IE_LIFETIME(preq_elem);
|
|
ttl = ifsta->mshcfg.dot11MeshTTL;
|
|
if (ttl != 0)
|
|
mesh_path_sel_frame_tx(MPATH_PREP, 0, dst_addr,
|
|
cpu_to_le32(dst_dsn), 0, orig_addr,
|
|
cpu_to_le32(orig_dsn), mgmt->sa, 0, ttl,
|
|
cpu_to_le32(lifetime), cpu_to_le32(metric),
|
|
0, dev);
|
|
else
|
|
ifsta->mshstats.dropped_frames_ttl++;
|
|
}
|
|
|
|
if (forward) {
|
|
u32 preq_id;
|
|
u8 hopcount, flags;
|
|
|
|
ttl = PREQ_IE_TTL(preq_elem);
|
|
lifetime = PREQ_IE_LIFETIME(preq_elem);
|
|
if (ttl <= 1) {
|
|
ifsta->mshstats.dropped_frames_ttl++;
|
|
return;
|
|
}
|
|
--ttl;
|
|
flags = PREQ_IE_FLAGS(preq_elem);
|
|
preq_id = PREQ_IE_PREQ_ID(preq_elem);
|
|
hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
|
|
mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
|
|
cpu_to_le32(orig_dsn), dst_flags, dst_addr,
|
|
cpu_to_le32(dst_dsn), dev->broadcast,
|
|
hopcount, ttl, cpu_to_le32(lifetime),
|
|
cpu_to_le32(metric), cpu_to_le32(preq_id),
|
|
dev);
|
|
ifsta->mshstats.fwded_frames++;
|
|
}
|
|
}
|
|
|
|
|
|
static void hwmp_prep_frame_process(struct net_device *dev,
|
|
struct ieee80211_mgmt *mgmt,
|
|
u8 *prep_elem, u32 metric)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
|
struct mesh_path *mpath;
|
|
u8 *dst_addr, *orig_addr;
|
|
u8 ttl, hopcount, flags;
|
|
u8 next_hop[ETH_ALEN];
|
|
u32 dst_dsn, orig_dsn, lifetime;
|
|
|
|
/* Note that we divert from the draft nomenclature and denominate
|
|
* destination to what the draft refers to as origininator. So in this
|
|
* function destnation refers to the final destination of the PREP,
|
|
* which corresponds with the originator of the PREQ which this PREP
|
|
* replies
|
|
*/
|
|
dst_addr = PREP_IE_DST_ADDR(prep_elem);
|
|
if (memcmp(dst_addr, dev->dev_addr, ETH_ALEN) == 0)
|
|
/* destination, no forwarding required */
|
|
return;
|
|
|
|
ttl = PREP_IE_TTL(prep_elem);
|
|
if (ttl <= 1) {
|
|
sdata->u.sta.mshstats.dropped_frames_ttl++;
|
|
return;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
mpath = mesh_path_lookup(dst_addr, dev);
|
|
if (mpath)
|
|
spin_lock_bh(&mpath->state_lock);
|
|
else
|
|
goto fail;
|
|
if (!(mpath->flags & MESH_PATH_ACTIVE)) {
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
goto fail;
|
|
}
|
|
memcpy(next_hop, mpath->next_hop->addr, ETH_ALEN);
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
--ttl;
|
|
flags = PREP_IE_FLAGS(prep_elem);
|
|
lifetime = PREP_IE_LIFETIME(prep_elem);
|
|
hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
|
|
orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
|
|
dst_dsn = PREP_IE_DST_DSN(prep_elem);
|
|
orig_dsn = PREP_IE_ORIG_DSN(prep_elem);
|
|
|
|
mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
|
|
cpu_to_le32(orig_dsn), 0, dst_addr,
|
|
cpu_to_le32(dst_dsn), mpath->next_hop->addr, hopcount, ttl,
|
|
cpu_to_le32(lifetime), cpu_to_le32(metric),
|
|
0, dev);
|
|
rcu_read_unlock();
|
|
sdata->u.sta.mshstats.fwded_frames++;
|
|
return;
|
|
|
|
fail:
|
|
rcu_read_unlock();
|
|
sdata->u.sta.mshstats.dropped_frames_no_route++;
|
|
return;
|
|
}
|
|
|
|
static void hwmp_perr_frame_process(struct net_device *dev,
|
|
struct ieee80211_mgmt *mgmt, u8 *perr_elem)
|
|
{
|
|
struct mesh_path *mpath;
|
|
u8 *ta, *dst_addr;
|
|
u32 dst_dsn;
|
|
|
|
ta = mgmt->sa;
|
|
dst_addr = PERR_IE_DST_ADDR(perr_elem);
|
|
dst_dsn = PERR_IE_DST_DSN(perr_elem);
|
|
rcu_read_lock();
|
|
mpath = mesh_path_lookup(dst_addr, dev);
|
|
if (mpath) {
|
|
spin_lock_bh(&mpath->state_lock);
|
|
if (mpath->flags & MESH_PATH_ACTIVE &&
|
|
memcmp(ta, mpath->next_hop->addr, ETH_ALEN) == 0 &&
|
|
(!(mpath->flags & MESH_PATH_DSN_VALID) ||
|
|
DSN_GT(dst_dsn, mpath->dsn))) {
|
|
mpath->flags &= ~MESH_PATH_ACTIVE;
|
|
mpath->dsn = dst_dsn;
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
mesh_path_error_tx(dst_addr, cpu_to_le32(dst_dsn),
|
|
dev->broadcast, dev);
|
|
} else
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
|
|
|
|
void mesh_rx_path_sel_frame(struct net_device *dev,
|
|
struct ieee80211_mgmt *mgmt,
|
|
size_t len)
|
|
{
|
|
struct ieee802_11_elems elems;
|
|
size_t baselen;
|
|
u32 last_hop_metric;
|
|
|
|
baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
|
|
ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
|
|
len - baselen, &elems);
|
|
|
|
switch (mgmt->u.action.u.mesh_action.action_code) {
|
|
case MPATH_PREQ:
|
|
if (!elems.preq || elems.preq_len != 37)
|
|
/* Right now we support just 1 destination and no AE */
|
|
return;
|
|
last_hop_metric = hwmp_route_info_get(dev, mgmt, elems.preq);
|
|
if (!last_hop_metric)
|
|
return;
|
|
hwmp_preq_frame_process(dev, mgmt, elems.preq, last_hop_metric);
|
|
break;
|
|
case MPATH_PREP:
|
|
if (!elems.prep || elems.prep_len != 31)
|
|
/* Right now we support no AE */
|
|
return;
|
|
last_hop_metric = hwmp_route_info_get(dev, mgmt, elems.prep);
|
|
if (!last_hop_metric)
|
|
return;
|
|
hwmp_prep_frame_process(dev, mgmt, elems.prep, last_hop_metric);
|
|
break;
|
|
case MPATH_PERR:
|
|
if (!elems.perr || elems.perr_len != 12)
|
|
/* Right now we support only one destination per PERR */
|
|
return;
|
|
hwmp_perr_frame_process(dev, mgmt, elems.perr);
|
|
default:
|
|
return;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* mesh_queue_preq - queue a PREQ to a given destination
|
|
*
|
|
* @mpath: mesh path to discover
|
|
* @flags: special attributes of the PREQ to be sent
|
|
*
|
|
* Locking: the function must be called from within a rcu read lock block.
|
|
*
|
|
*/
|
|
static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata =
|
|
IEEE80211_DEV_TO_SUB_IF(mpath->dev);
|
|
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
|
|
struct mesh_preq_queue *preq_node;
|
|
|
|
preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_KERNEL);
|
|
if (!preq_node) {
|
|
printk(KERN_DEBUG "Mesh HWMP: could not allocate PREQ node\n");
|
|
return;
|
|
}
|
|
|
|
spin_lock(&ifsta->mesh_preq_queue_lock);
|
|
if (ifsta->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
|
|
spin_unlock(&ifsta->mesh_preq_queue_lock);
|
|
kfree(preq_node);
|
|
if (printk_ratelimit())
|
|
printk(KERN_DEBUG "Mesh HWMP: PREQ node queue full\n");
|
|
return;
|
|
}
|
|
|
|
memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
|
|
preq_node->flags = flags;
|
|
|
|
list_add_tail(&preq_node->list, &ifsta->preq_queue.list);
|
|
++ifsta->preq_queue_len;
|
|
spin_unlock(&ifsta->mesh_preq_queue_lock);
|
|
|
|
if (time_after(jiffies, ifsta->last_preq + min_preq_int_jiff(sdata)))
|
|
queue_work(sdata->local->hw.workqueue, &ifsta->work);
|
|
|
|
else if (time_before(jiffies, ifsta->last_preq)) {
|
|
/* avoid long wait if did not send preqs for a long time
|
|
* and jiffies wrapped around
|
|
*/
|
|
ifsta->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
|
|
queue_work(sdata->local->hw.workqueue, &ifsta->work);
|
|
} else
|
|
mod_timer(&ifsta->mesh_path_timer, ifsta->last_preq +
|
|
min_preq_int_jiff(sdata));
|
|
}
|
|
|
|
/**
|
|
* mesh_path_start_discovery - launch a path discovery from the PREQ queue
|
|
*
|
|
* @dev: local mesh interface
|
|
*/
|
|
void mesh_path_start_discovery(struct net_device *dev)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata =
|
|
IEEE80211_DEV_TO_SUB_IF(dev);
|
|
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
|
|
struct mesh_preq_queue *preq_node;
|
|
struct mesh_path *mpath;
|
|
u8 ttl, dst_flags;
|
|
u32 lifetime;
|
|
|
|
spin_lock(&ifsta->mesh_preq_queue_lock);
|
|
if (!ifsta->preq_queue_len ||
|
|
time_before(jiffies, ifsta->last_preq +
|
|
min_preq_int_jiff(sdata))) {
|
|
spin_unlock(&ifsta->mesh_preq_queue_lock);
|
|
return;
|
|
}
|
|
|
|
preq_node = list_first_entry(&ifsta->preq_queue.list,
|
|
struct mesh_preq_queue, list);
|
|
list_del(&preq_node->list);
|
|
--ifsta->preq_queue_len;
|
|
spin_unlock(&ifsta->mesh_preq_queue_lock);
|
|
|
|
rcu_read_lock();
|
|
mpath = mesh_path_lookup(preq_node->dst, dev);
|
|
if (!mpath)
|
|
goto enddiscovery;
|
|
|
|
spin_lock_bh(&mpath->state_lock);
|
|
if (preq_node->flags & PREQ_Q_F_START) {
|
|
if (mpath->flags & MESH_PATH_RESOLVING) {
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
goto enddiscovery;
|
|
} else {
|
|
mpath->flags &= ~MESH_PATH_RESOLVED;
|
|
mpath->flags |= MESH_PATH_RESOLVING;
|
|
mpath->discovery_retries = 0;
|
|
mpath->discovery_timeout = disc_timeout_jiff(sdata);
|
|
}
|
|
} else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
|
|
mpath->flags & MESH_PATH_RESOLVED) {
|
|
mpath->flags &= ~MESH_PATH_RESOLVING;
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
goto enddiscovery;
|
|
}
|
|
|
|
ifsta->last_preq = jiffies;
|
|
|
|
if (time_after(jiffies, ifsta->last_dsn_update +
|
|
net_traversal_jiffies(sdata)) ||
|
|
time_before(jiffies, ifsta->last_dsn_update)) {
|
|
++ifsta->dsn;
|
|
sdata->u.sta.last_dsn_update = jiffies;
|
|
}
|
|
lifetime = default_lifetime(sdata);
|
|
ttl = sdata->u.sta.mshcfg.dot11MeshTTL;
|
|
if (ttl == 0) {
|
|
sdata->u.sta.mshstats.dropped_frames_ttl++;
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
goto enddiscovery;
|
|
}
|
|
|
|
if (preq_node->flags & PREQ_Q_F_REFRESH)
|
|
dst_flags = MP_F_DO;
|
|
else
|
|
dst_flags = MP_F_RF;
|
|
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
mesh_path_sel_frame_tx(MPATH_PREQ, 0, dev->dev_addr,
|
|
cpu_to_le32(ifsta->dsn), dst_flags, mpath->dst,
|
|
cpu_to_le32(mpath->dsn), dev->broadcast, 0,
|
|
ttl, cpu_to_le32(lifetime), 0,
|
|
cpu_to_le32(ifsta->preq_id++), dev);
|
|
mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
|
|
|
|
enddiscovery:
|
|
rcu_read_unlock();
|
|
kfree(preq_node);
|
|
}
|
|
|
|
/**
|
|
* ieee80211s_lookup_nexthop - put the appropriate next hop on a mesh frame
|
|
*
|
|
* @next_hop: output argument for next hop address
|
|
* @skb: frame to be sent
|
|
* @dev: network device the frame will be sent through
|
|
*
|
|
* Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is
|
|
* found, the function will start a path discovery and queue the frame so it is
|
|
* sent when the path is resolved. This means the caller must not free the skb
|
|
* in this case.
|
|
*/
|
|
int mesh_nexthop_lookup(u8 *next_hop, struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
|
|
struct sk_buff *skb_to_free = NULL;
|
|
struct mesh_path *mpath;
|
|
int err = 0;
|
|
|
|
rcu_read_lock();
|
|
mpath = mesh_path_lookup(skb->data, dev);
|
|
|
|
if (!mpath) {
|
|
mesh_path_add(skb->data, dev);
|
|
mpath = mesh_path_lookup(skb->data, dev);
|
|
if (!mpath) {
|
|
dev_kfree_skb(skb);
|
|
sdata->u.sta.mshstats.dropped_frames_no_route++;
|
|
err = -ENOSPC;
|
|
goto endlookup;
|
|
}
|
|
}
|
|
|
|
if (mpath->flags & MESH_PATH_ACTIVE) {
|
|
if (time_after(jiffies, mpath->exp_time -
|
|
msecs_to_jiffies(sdata->u.sta.mshcfg.path_refresh_time))
|
|
&& skb->pkt_type != PACKET_OTHERHOST
|
|
&& !(mpath->flags & MESH_PATH_RESOLVING)
|
|
&& !(mpath->flags & MESH_PATH_FIXED)) {
|
|
mesh_queue_preq(mpath,
|
|
PREQ_Q_F_START | PREQ_Q_F_REFRESH);
|
|
}
|
|
memcpy(next_hop, mpath->next_hop->addr,
|
|
ETH_ALEN);
|
|
} else {
|
|
if (!(mpath->flags & MESH_PATH_RESOLVING)) {
|
|
/* Start discovery only if it is not running yet */
|
|
mesh_queue_preq(mpath, PREQ_Q_F_START);
|
|
}
|
|
|
|
if (skb_queue_len(&mpath->frame_queue) >=
|
|
MESH_FRAME_QUEUE_LEN) {
|
|
skb_to_free = mpath->frame_queue.next;
|
|
skb_unlink(skb_to_free, &mpath->frame_queue);
|
|
}
|
|
|
|
skb_queue_tail(&mpath->frame_queue, skb);
|
|
if (skb_to_free)
|
|
mesh_path_discard_frame(skb_to_free, dev);
|
|
err = -ENOENT;
|
|
}
|
|
|
|
endlookup:
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
void mesh_path_timer(unsigned long data)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct mesh_path *mpath;
|
|
|
|
rcu_read_lock();
|
|
mpath = (struct mesh_path *) data;
|
|
mpath = rcu_dereference(mpath);
|
|
if (!mpath)
|
|
goto endmpathtimer;
|
|
spin_lock_bh(&mpath->state_lock);
|
|
sdata = IEEE80211_DEV_TO_SUB_IF(mpath->dev);
|
|
if (mpath->flags & MESH_PATH_RESOLVED ||
|
|
(!(mpath->flags & MESH_PATH_RESOLVING)))
|
|
mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
|
|
else if (mpath->discovery_retries < max_preq_retries(sdata)) {
|
|
++mpath->discovery_retries;
|
|
mpath->discovery_timeout *= 2;
|
|
mesh_queue_preq(mpath, 0);
|
|
} else {
|
|
mpath->flags = 0;
|
|
mpath->exp_time = jiffies;
|
|
mesh_path_flush_pending(mpath);
|
|
}
|
|
|
|
spin_unlock_bh(&mpath->state_lock);
|
|
endmpathtimer:
|
|
rcu_read_unlock();
|
|
}
|