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1323 lines
38 KiB
1323 lines
38 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2008, 2009 open80211s Ltd. |
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* Copyright (C) 2019 Intel Corporation |
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* Author: Luis Carlos Cobo <[email protected]> |
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*/ |
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|
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#include <linux/slab.h> |
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#include <linux/etherdevice.h> |
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#include <asm/unaligned.h> |
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#include "wme.h" |
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#include "mesh.h" |
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|
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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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#define LINK_FAIL_THRESH 95 |
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#define MAX_PREQ_QUEUE_LEN 64 |
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|
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static void mesh_queue_preq(struct mesh_path *, u8); |
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|
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static inline u32 u32_field_get(const 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 get_unaligned_le32(preq_elem + offset); |
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} |
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static inline u16 u16_field_get(const 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 get_unaligned_le16(preq_elem + offset); |
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} |
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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_SN(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_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
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#define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) |
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#define PREQ_IE_TARGET_SN(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) (AE_F_SET(x) ? x + 27 : x + 21) |
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#define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) |
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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_TARGET_ADDR(x) (x + 3) |
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#define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
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|
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#define PERR_IE_TTL(x) (*(x)) |
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#define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
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#define PERR_IE_TARGET_ADDR(x) (x + 3) |
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#define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
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#define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) |
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#define MSEC_TO_TU(x) (x*1000/1024) |
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#define SN_GT(x, y) ((s32)(y - x) < 0) |
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#define SN_LT(x, y) ((s32)(x - y) < 0) |
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#define MAX_SANE_SN_DELTA 32 |
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static inline u32 SN_DELTA(u32 x, u32 y) |
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{ |
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return x >= y ? x - y : y - x; |
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} |
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#define net_traversal_jiffies(s) \ |
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msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
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#define default_lifetime(s) \ |
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MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
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#define min_preq_int_jiff(s) \ |
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(msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
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#define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) |
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#define disc_timeout_jiff(s) \ |
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msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
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#define root_path_confirmation_jiffies(s) \ |
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msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) |
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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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MPATH_RANN |
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}; |
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static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
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static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
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const u8 *orig_addr, u32 orig_sn, |
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u8 target_flags, const u8 *target, |
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u32 target_sn, const u8 *da, |
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u8 hop_count, u8 ttl, |
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u32 lifetime, u32 metric, u32 preq_id, |
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struct ieee80211_sub_if_data *sdata) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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struct sk_buff *skb; |
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struct ieee80211_mgmt *mgmt; |
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u8 *pos, ie_len; |
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int hdr_len = offsetofend(struct ieee80211_mgmt, |
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u.action.u.mesh_action); |
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|
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skb = dev_alloc_skb(local->tx_headroom + |
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hdr_len + |
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2 + 37); /* max HWMP IE */ |
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if (!skb) |
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return -1; |
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skb_reserve(skb, local->tx_headroom); |
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mgmt = skb_put_zero(skb, hdr_len); |
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mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
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IEEE80211_STYPE_ACTION); |
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|
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memcpy(mgmt->da, da, ETH_ALEN); |
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memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
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/* BSSID == SA */ |
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memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
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mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
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mgmt->u.action.u.mesh_action.action_code = |
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WLAN_MESH_ACTION_HWMP_PATH_SELECTION; |
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|
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switch (action) { |
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case MPATH_PREQ: |
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mhwmp_dbg(sdata, "sending PREQ to %pM\n", target); |
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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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mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr); |
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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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case MPATH_RANN: |
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mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr); |
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ie_len = sizeof(struct ieee80211_rann_ie); |
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pos = skb_put(skb, 2 + ie_len); |
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*pos++ = WLAN_EID_RANN; |
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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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} |
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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_PREP) { |
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memcpy(pos, target, ETH_ALEN); |
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pos += ETH_ALEN; |
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put_unaligned_le32(target_sn, pos); |
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pos += 4; |
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} else { |
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if (action == MPATH_PREQ) { |
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put_unaligned_le32(preq_id, pos); |
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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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put_unaligned_le32(orig_sn, pos); |
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pos += 4; |
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} |
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put_unaligned_le32(lifetime, pos); /* interval for RANN */ |
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pos += 4; |
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put_unaligned_le32(metric, pos); |
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pos += 4; |
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if (action == MPATH_PREQ) { |
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*pos++ = 1; /* destination count */ |
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*pos++ = target_flags; |
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memcpy(pos, target, ETH_ALEN); |
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pos += ETH_ALEN; |
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put_unaligned_le32(target_sn, pos); |
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pos += 4; |
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} else if (action == MPATH_PREP) { |
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memcpy(pos, orig_addr, ETH_ALEN); |
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pos += ETH_ALEN; |
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put_unaligned_le32(orig_sn, pos); |
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pos += 4; |
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} |
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ieee80211_tx_skb(sdata, skb); |
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return 0; |
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} |
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/* Headroom is not adjusted. Caller should ensure that skb has sufficient |
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* headroom in case the frame is encrypted. */ |
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static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb) |
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{ |
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
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skb_reset_mac_header(skb); |
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skb_reset_network_header(skb); |
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skb_reset_transport_header(skb); |
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/* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ |
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skb_set_queue_mapping(skb, IEEE80211_AC_VO); |
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skb->priority = 7; |
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info->control.vif = &sdata->vif; |
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info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; |
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ieee80211_set_qos_hdr(sdata, skb); |
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ieee80211_mps_set_frame_flags(sdata, NULL, hdr); |
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} |
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/** |
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* mesh_path_error_tx - Sends a PERR mesh management frame |
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* |
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* @ttl: allowed remaining hops |
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* @target: broken destination |
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* @target_sn: SN of the broken destination |
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* @target_rcode: reason code for this PERR |
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* @ra: node this frame is addressed to |
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* @sdata: local mesh subif |
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* |
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* Note: This function may be called with driver locks taken that the driver |
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* also acquires in the TX path. To avoid a deadlock we don't transmit the |
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* frame directly but add it to the pending queue instead. |
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*/ |
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int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, |
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u8 ttl, const u8 *target, u32 target_sn, |
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u16 target_rcode, const u8 *ra) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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struct sk_buff *skb; |
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struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
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struct ieee80211_mgmt *mgmt; |
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u8 *pos, ie_len; |
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int hdr_len = offsetofend(struct ieee80211_mgmt, |
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u.action.u.mesh_action); |
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if (time_before(jiffies, ifmsh->next_perr)) |
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return -EAGAIN; |
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skb = dev_alloc_skb(local->tx_headroom + |
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sdata->encrypt_headroom + |
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IEEE80211_ENCRYPT_TAILROOM + |
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hdr_len + |
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2 + 15 /* PERR IE */); |
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if (!skb) |
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return -1; |
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skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom); |
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mgmt = skb_put_zero(skb, hdr_len); |
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mgmt->frame_control = cpu_to_le16(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, sdata->vif.addr, ETH_ALEN); |
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/* BSSID == SA */ |
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memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
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mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
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mgmt->u.action.u.mesh_action.action_code = |
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WLAN_MESH_ACTION_HWMP_PATH_SELECTION; |
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ie_len = 15; |
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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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/* ttl */ |
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*pos++ = ttl; |
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/* number of destinations */ |
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*pos++ = 1; |
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/* Flags field has AE bit only as defined in |
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* sec 8.4.2.117 IEEE802.11-2012 |
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*/ |
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*pos = 0; |
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pos++; |
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memcpy(pos, target, ETH_ALEN); |
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pos += ETH_ALEN; |
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put_unaligned_le32(target_sn, pos); |
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pos += 4; |
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put_unaligned_le16(target_rcode, pos); |
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/* see note in function header */ |
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prepare_frame_for_deferred_tx(sdata, skb); |
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ifmsh->next_perr = TU_TO_EXP_TIME( |
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ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); |
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ieee80211_add_pending_skb(local, skb); |
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return 0; |
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} |
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void ieee80211s_update_metric(struct ieee80211_local *local, |
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struct sta_info *sta, |
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struct ieee80211_tx_status *st) |
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{ |
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struct ieee80211_tx_info *txinfo = st->info; |
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int failed; |
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struct rate_info rinfo; |
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failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); |
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|
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/* moving average, scaled to 100. |
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* feed failure as 100 and success as 0 |
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*/ |
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ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, failed * 100); |
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if (ewma_mesh_fail_avg_read(&sta->mesh->fail_avg) > |
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LINK_FAIL_THRESH) |
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mesh_plink_broken(sta); |
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sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo); |
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ewma_mesh_tx_rate_avg_add(&sta->mesh->tx_rate_avg, |
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cfg80211_calculate_bitrate(&rinfo)); |
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} |
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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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/* 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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unsigned long fail_avg = |
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ewma_mesh_fail_avg_read(&sta->mesh->fail_avg); |
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if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
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return MAX_METRIC; |
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/* Try to get rate based on HW/SW RC algorithm. |
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* Rate is returned in units of Kbps, correct this |
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* to comply with airtime calculation units |
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* Round up in case we get rate < 100Kbps |
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*/ |
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rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 100); |
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if (rate) { |
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err = 0; |
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} else { |
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if (fail_avg > LINK_FAIL_THRESH) |
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return MAX_METRIC; |
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rate = ewma_mesh_tx_rate_avg_read(&sta->mesh->tx_rate_avg); |
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if (WARN_ON(!rate)) |
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return MAX_METRIC; |
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err = (fail_avg << ARITH_SHIFT) / 100; |
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} |
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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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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 = ((u64)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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* @sdata: local mesh subif |
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* @mgmt: mesh management frame |
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* @hwmp_ie: hwmp information element (PREP or PREQ) |
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* @action: type of hwmp ie |
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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 frame. |
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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 ieee80211_sub_if_data *sdata, |
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struct ieee80211_mgmt *mgmt, |
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const u8 *hwmp_ie, enum mpath_frame_type action) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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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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const u8 *orig_addr, *ta; |
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u32 orig_sn, 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 hopcount; |
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|
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rcu_read_lock(); |
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sta = sta_info_get(sdata, 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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|
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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_sn = PREQ_IE_ORIG_SN(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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hopcount = PREQ_IE_HOPCOUNT(hwmp_ie) + 1; |
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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 target in the |
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* Path Request. 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_TARGET_ADDR(hwmp_ie); |
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orig_sn = PREP_IE_TARGET_SN(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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hopcount = PREP_IE_HOPCOUNT(hwmp_ie) + 1; |
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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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|
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if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
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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(sdata, orig_addr); |
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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_SN_VALID)) { |
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if (SN_GT(mpath->sn, orig_sn) || |
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(mpath->sn == orig_sn && |
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(rcu_access_pointer(mpath->next_hop) != |
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sta ? |
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mult_frac(new_metric, 10, 9) : |
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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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} else if (!(mpath->flags & MESH_PATH_ACTIVE)) { |
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bool have_sn, newer_sn, bounced; |
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|
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have_sn = mpath->flags & MESH_PATH_SN_VALID; |
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newer_sn = have_sn && SN_GT(orig_sn, mpath->sn); |
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bounced = have_sn && |
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(SN_DELTA(orig_sn, mpath->sn) > |
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MAX_SANE_SN_DELTA); |
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|
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if (!have_sn || newer_sn) { |
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/* if SN is newer than what we had |
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* then we can take it */; |
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} else if (bounced) { |
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/* if SN is way different than what |
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* we had then assume the other side |
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* rebooted or restarted */; |
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} else { |
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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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mpath = mesh_path_add(sdata, orig_addr); |
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if (IS_ERR(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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|
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if (fresh_info) { |
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if (rcu_access_pointer(mpath->next_hop) != sta) |
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mpath->path_change_count++; |
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mesh_path_assign_nexthop(mpath, sta); |
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mpath->flags |= MESH_PATH_SN_VALID; |
|
mpath->metric = new_metric; |
|
mpath->sn = orig_sn; |
|
mpath->exp_time = time_after(mpath->exp_time, exp_time) |
|
? mpath->exp_time : exp_time; |
|
mpath->hop_count = hopcount; |
|
mesh_path_activate(mpath); |
|
spin_unlock_bh(&mpath->state_lock); |
|
ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
|
/* init it at a low value - 0 start is tricky */ |
|
ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); |
|
mesh_path_tx_pending(mpath); |
|
/* draft says preq_id should be saved to, but there does |
|
* not seem to be any use for it, skipping by now |
|
*/ |
|
} else |
|
spin_unlock_bh(&mpath->state_lock); |
|
} |
|
|
|
/* Update and check transmitter routing info */ |
|
ta = mgmt->sa; |
|
if (ether_addr_equal(orig_addr, ta)) |
|
fresh_info = false; |
|
else { |
|
fresh_info = true; |
|
|
|
mpath = mesh_path_lookup(sdata, ta); |
|
if (mpath) { |
|
spin_lock_bh(&mpath->state_lock); |
|
if ((mpath->flags & MESH_PATH_FIXED) || |
|
((mpath->flags & MESH_PATH_ACTIVE) && |
|
((rcu_access_pointer(mpath->next_hop) != sta ? |
|
mult_frac(last_hop_metric, 10, 9) : |
|
last_hop_metric) > mpath->metric))) |
|
fresh_info = false; |
|
} else { |
|
mpath = mesh_path_add(sdata, ta); |
|
if (IS_ERR(mpath)) { |
|
rcu_read_unlock(); |
|
return 0; |
|
} |
|
spin_lock_bh(&mpath->state_lock); |
|
} |
|
|
|
if (fresh_info) { |
|
if (rcu_access_pointer(mpath->next_hop) != sta) |
|
mpath->path_change_count++; |
|
mesh_path_assign_nexthop(mpath, sta); |
|
mpath->metric = last_hop_metric; |
|
mpath->exp_time = time_after(mpath->exp_time, exp_time) |
|
? mpath->exp_time : exp_time; |
|
mpath->hop_count = 1; |
|
mesh_path_activate(mpath); |
|
spin_unlock_bh(&mpath->state_lock); |
|
ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
|
/* init it at a low value - 0 start is tricky */ |
|
ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); |
|
mesh_path_tx_pending(mpath); |
|
} else |
|
spin_unlock_bh(&mpath->state_lock); |
|
} |
|
|
|
rcu_read_unlock(); |
|
|
|
return process ? new_metric : 0; |
|
} |
|
|
|
static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
|
struct ieee80211_mgmt *mgmt, |
|
const u8 *preq_elem, u32 orig_metric) |
|
{ |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
struct mesh_path *mpath = NULL; |
|
const u8 *target_addr, *orig_addr; |
|
const u8 *da; |
|
u8 target_flags, ttl, flags; |
|
u32 orig_sn, target_sn, lifetime, target_metric = 0; |
|
bool reply = false; |
|
bool forward = true; |
|
bool root_is_gate; |
|
|
|
/* Update target SN, if present */ |
|
target_addr = PREQ_IE_TARGET_ADDR(preq_elem); |
|
orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
|
target_sn = PREQ_IE_TARGET_SN(preq_elem); |
|
orig_sn = PREQ_IE_ORIG_SN(preq_elem); |
|
target_flags = PREQ_IE_TARGET_F(preq_elem); |
|
/* Proactive PREQ gate announcements */ |
|
flags = PREQ_IE_FLAGS(preq_elem); |
|
root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
|
|
|
mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
|
|
|
if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
|
mhwmp_dbg(sdata, "PREQ is for us\n"); |
|
forward = false; |
|
reply = true; |
|
target_metric = 0; |
|
|
|
if (SN_GT(target_sn, ifmsh->sn)) |
|
ifmsh->sn = target_sn; |
|
|
|
if (time_after(jiffies, ifmsh->last_sn_update + |
|
net_traversal_jiffies(sdata)) || |
|
time_before(jiffies, ifmsh->last_sn_update)) { |
|
++ifmsh->sn; |
|
ifmsh->last_sn_update = jiffies; |
|
} |
|
target_sn = ifmsh->sn; |
|
} else if (is_broadcast_ether_addr(target_addr) && |
|
(target_flags & IEEE80211_PREQ_TO_FLAG)) { |
|
rcu_read_lock(); |
|
mpath = mesh_path_lookup(sdata, orig_addr); |
|
if (mpath) { |
|
if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { |
|
reply = true; |
|
target_addr = sdata->vif.addr; |
|
target_sn = ++ifmsh->sn; |
|
target_metric = 0; |
|
ifmsh->last_sn_update = jiffies; |
|
} |
|
if (root_is_gate) |
|
mesh_path_add_gate(mpath); |
|
} |
|
rcu_read_unlock(); |
|
} else { |
|
rcu_read_lock(); |
|
mpath = mesh_path_lookup(sdata, target_addr); |
|
if (mpath) { |
|
if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
|
SN_LT(mpath->sn, target_sn)) { |
|
mpath->sn = target_sn; |
|
mpath->flags |= MESH_PATH_SN_VALID; |
|
} else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) && |
|
(mpath->flags & MESH_PATH_ACTIVE)) { |
|
reply = true; |
|
target_metric = mpath->metric; |
|
target_sn = mpath->sn; |
|
/* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/ |
|
target_flags |= IEEE80211_PREQ_TO_FLAG; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
if (reply) { |
|
lifetime = PREQ_IE_LIFETIME(preq_elem); |
|
ttl = ifmsh->mshcfg.element_ttl; |
|
if (ttl != 0) { |
|
mhwmp_dbg(sdata, "replying to the PREQ\n"); |
|
mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
|
orig_sn, 0, target_addr, |
|
target_sn, mgmt->sa, 0, ttl, |
|
lifetime, target_metric, 0, |
|
sdata); |
|
} else { |
|
ifmsh->mshstats.dropped_frames_ttl++; |
|
} |
|
} |
|
|
|
if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
|
u32 preq_id; |
|
u8 hopcount; |
|
|
|
ttl = PREQ_IE_TTL(preq_elem); |
|
lifetime = PREQ_IE_LIFETIME(preq_elem); |
|
if (ttl <= 1) { |
|
ifmsh->mshstats.dropped_frames_ttl++; |
|
return; |
|
} |
|
mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
|
--ttl; |
|
preq_id = PREQ_IE_PREQ_ID(preq_elem); |
|
hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; |
|
da = (mpath && mpath->is_root) ? |
|
mpath->rann_snd_addr : broadcast_addr; |
|
|
|
if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { |
|
target_addr = PREQ_IE_TARGET_ADDR(preq_elem); |
|
target_sn = PREQ_IE_TARGET_SN(preq_elem); |
|
} |
|
|
|
mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
|
orig_sn, target_flags, target_addr, |
|
target_sn, da, hopcount, ttl, lifetime, |
|
orig_metric, preq_id, sdata); |
|
if (!is_multicast_ether_addr(da)) |
|
ifmsh->mshstats.fwded_unicast++; |
|
else |
|
ifmsh->mshstats.fwded_mcast++; |
|
ifmsh->mshstats.fwded_frames++; |
|
} |
|
} |
|
|
|
|
|
static inline struct sta_info * |
|
next_hop_deref_protected(struct mesh_path *mpath) |
|
{ |
|
return rcu_dereference_protected(mpath->next_hop, |
|
lockdep_is_held(&mpath->state_lock)); |
|
} |
|
|
|
|
|
static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
|
struct ieee80211_mgmt *mgmt, |
|
const u8 *prep_elem, u32 metric) |
|
{ |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
struct mesh_path *mpath; |
|
const u8 *target_addr, *orig_addr; |
|
u8 ttl, hopcount, flags; |
|
u8 next_hop[ETH_ALEN]; |
|
u32 target_sn, orig_sn, lifetime; |
|
|
|
mhwmp_dbg(sdata, "received PREP from %pM\n", |
|
PREP_IE_TARGET_ADDR(prep_elem)); |
|
|
|
orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
|
if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
|
/* destination, no forwarding required */ |
|
return; |
|
|
|
if (!ifmsh->mshcfg.dot11MeshForwarding) |
|
return; |
|
|
|
ttl = PREP_IE_TTL(prep_elem); |
|
if (ttl <= 1) { |
|
sdata->u.mesh.mshstats.dropped_frames_ttl++; |
|
return; |
|
} |
|
|
|
rcu_read_lock(); |
|
mpath = mesh_path_lookup(sdata, orig_addr); |
|
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, next_hop_deref_protected(mpath)->sta.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; |
|
target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
|
target_sn = PREP_IE_TARGET_SN(prep_elem); |
|
orig_sn = PREP_IE_ORIG_SN(prep_elem); |
|
|
|
mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0, |
|
target_addr, target_sn, next_hop, hopcount, |
|
ttl, lifetime, metric, 0, sdata); |
|
rcu_read_unlock(); |
|
|
|
sdata->u.mesh.mshstats.fwded_unicast++; |
|
sdata->u.mesh.mshstats.fwded_frames++; |
|
return; |
|
|
|
fail: |
|
rcu_read_unlock(); |
|
sdata->u.mesh.mshstats.dropped_frames_no_route++; |
|
} |
|
|
|
static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
|
struct ieee80211_mgmt *mgmt, |
|
const u8 *perr_elem) |
|
{ |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
struct mesh_path *mpath; |
|
u8 ttl; |
|
const u8 *ta, *target_addr; |
|
u32 target_sn; |
|
u16 target_rcode; |
|
|
|
ta = mgmt->sa; |
|
ttl = PERR_IE_TTL(perr_elem); |
|
if (ttl <= 1) { |
|
ifmsh->mshstats.dropped_frames_ttl++; |
|
return; |
|
} |
|
ttl--; |
|
target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
|
target_sn = PERR_IE_TARGET_SN(perr_elem); |
|
target_rcode = PERR_IE_TARGET_RCODE(perr_elem); |
|
|
|
rcu_read_lock(); |
|
mpath = mesh_path_lookup(sdata, target_addr); |
|
if (mpath) { |
|
struct sta_info *sta; |
|
|
|
spin_lock_bh(&mpath->state_lock); |
|
sta = next_hop_deref_protected(mpath); |
|
if (mpath->flags & MESH_PATH_ACTIVE && |
|
ether_addr_equal(ta, sta->sta.addr) && |
|
!(mpath->flags & MESH_PATH_FIXED) && |
|
(!(mpath->flags & MESH_PATH_SN_VALID) || |
|
SN_GT(target_sn, mpath->sn) || target_sn == 0)) { |
|
mpath->flags &= ~MESH_PATH_ACTIVE; |
|
if (target_sn != 0) |
|
mpath->sn = target_sn; |
|
else |
|
mpath->sn += 1; |
|
spin_unlock_bh(&mpath->state_lock); |
|
if (!ifmsh->mshcfg.dot11MeshForwarding) |
|
goto endperr; |
|
mesh_path_error_tx(sdata, ttl, target_addr, |
|
target_sn, target_rcode, |
|
broadcast_addr); |
|
} else |
|
spin_unlock_bh(&mpath->state_lock); |
|
} |
|
endperr: |
|
rcu_read_unlock(); |
|
} |
|
|
|
static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
|
struct ieee80211_mgmt *mgmt, |
|
const struct ieee80211_rann_ie *rann) |
|
{ |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
struct ieee80211_local *local = sdata->local; |
|
struct sta_info *sta; |
|
struct mesh_path *mpath; |
|
u8 ttl, flags, hopcount; |
|
const u8 *orig_addr; |
|
u32 orig_sn, new_metric, orig_metric, last_hop_metric, interval; |
|
bool root_is_gate; |
|
|
|
ttl = rann->rann_ttl; |
|
flags = rann->rann_flags; |
|
root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
|
orig_addr = rann->rann_addr; |
|
orig_sn = le32_to_cpu(rann->rann_seq); |
|
interval = le32_to_cpu(rann->rann_interval); |
|
hopcount = rann->rann_hopcount; |
|
hopcount++; |
|
orig_metric = le32_to_cpu(rann->rann_metric); |
|
|
|
/* Ignore our own RANNs */ |
|
if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
|
return; |
|
|
|
mhwmp_dbg(sdata, |
|
"received RANN from %pM via neighbour %pM (is_gate=%d)\n", |
|
orig_addr, mgmt->sa, root_is_gate); |
|
|
|
rcu_read_lock(); |
|
sta = sta_info_get(sdata, mgmt->sa); |
|
if (!sta) { |
|
rcu_read_unlock(); |
|
return; |
|
} |
|
|
|
last_hop_metric = airtime_link_metric_get(local, sta); |
|
new_metric = orig_metric + last_hop_metric; |
|
if (new_metric < orig_metric) |
|
new_metric = MAX_METRIC; |
|
|
|
mpath = mesh_path_lookup(sdata, orig_addr); |
|
if (!mpath) { |
|
mpath = mesh_path_add(sdata, orig_addr); |
|
if (IS_ERR(mpath)) { |
|
rcu_read_unlock(); |
|
sdata->u.mesh.mshstats.dropped_frames_no_route++; |
|
return; |
|
} |
|
} |
|
|
|
if (!(SN_LT(mpath->sn, orig_sn)) && |
|
!(mpath->sn == orig_sn && new_metric < mpath->rann_metric)) { |
|
rcu_read_unlock(); |
|
return; |
|
} |
|
|
|
if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
|
(time_after(jiffies, mpath->last_preq_to_root + |
|
root_path_confirmation_jiffies(sdata)) || |
|
time_before(jiffies, mpath->last_preq_to_root))) && |
|
!(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
|
mhwmp_dbg(sdata, |
|
"time to refresh root mpath %pM\n", |
|
orig_addr); |
|
mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
|
mpath->last_preq_to_root = jiffies; |
|
} |
|
|
|
mpath->sn = orig_sn; |
|
mpath->rann_metric = new_metric; |
|
mpath->is_root = true; |
|
/* Recording RANNs sender address to send individually |
|
* addressed PREQs destined for root mesh STA */ |
|
memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); |
|
|
|
if (root_is_gate) |
|
mesh_path_add_gate(mpath); |
|
|
|
if (ttl <= 1) { |
|
ifmsh->mshstats.dropped_frames_ttl++; |
|
rcu_read_unlock(); |
|
return; |
|
} |
|
ttl--; |
|
|
|
if (ifmsh->mshcfg.dot11MeshForwarding) { |
|
mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
|
orig_sn, 0, NULL, 0, broadcast_addr, |
|
hopcount, ttl, interval, |
|
new_metric, 0, sdata); |
|
} |
|
|
|
rcu_read_unlock(); |
|
} |
|
|
|
|
|
void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
|
struct ieee80211_mgmt *mgmt, size_t len) |
|
{ |
|
struct ieee802_11_elems elems; |
|
size_t baselen; |
|
u32 path_metric; |
|
struct sta_info *sta; |
|
|
|
/* need action_code */ |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
|
return; |
|
|
|
rcu_read_lock(); |
|
sta = sta_info_get(sdata, mgmt->sa); |
|
if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { |
|
rcu_read_unlock(); |
|
return; |
|
} |
|
rcu_read_unlock(); |
|
|
|
baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
|
ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, |
|
len - baselen, false, &elems, mgmt->bssid, NULL); |
|
|
|
if (elems.preq) { |
|
if (elems.preq_len != 37) |
|
/* Right now we support just 1 destination and no AE */ |
|
return; |
|
path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
|
MPATH_PREQ); |
|
if (path_metric) |
|
hwmp_preq_frame_process(sdata, mgmt, elems.preq, |
|
path_metric); |
|
} |
|
if (elems.prep) { |
|
if (elems.prep_len != 31) |
|
/* Right now we support no AE */ |
|
return; |
|
path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
|
MPATH_PREP); |
|
if (path_metric) |
|
hwmp_prep_frame_process(sdata, mgmt, elems.prep, |
|
path_metric); |
|
} |
|
if (elems.perr) { |
|
if (elems.perr_len != 15) |
|
/* Right now we support only one destination per PERR */ |
|
return; |
|
hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
|
} |
|
if (elems.rann) |
|
hwmp_rann_frame_process(sdata, mgmt, elems.rann); |
|
} |
|
|
|
/** |
|
* 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 = mpath->sdata; |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
struct mesh_preq_queue *preq_node; |
|
|
|
preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
|
if (!preq_node) { |
|
mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
|
return; |
|
} |
|
|
|
spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
|
if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
|
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
|
kfree(preq_node); |
|
if (printk_ratelimit()) |
|
mhwmp_dbg(sdata, "PREQ node queue full\n"); |
|
return; |
|
} |
|
|
|
spin_lock(&mpath->state_lock); |
|
if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
|
spin_unlock(&mpath->state_lock); |
|
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
|
kfree(preq_node); |
|
return; |
|
} |
|
|
|
memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
|
preq_node->flags = flags; |
|
|
|
mpath->flags |= MESH_PATH_REQ_QUEUED; |
|
spin_unlock(&mpath->state_lock); |
|
|
|
list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
|
++ifmsh->preq_queue_len; |
|
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
|
|
|
if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
|
ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
|
|
|
else if (time_before(jiffies, ifmsh->last_preq)) { |
|
/* avoid long wait if did not send preqs for a long time |
|
* and jiffies wrapped around |
|
*/ |
|
ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
|
ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
|
} else |
|
mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
|
min_preq_int_jiff(sdata)); |
|
} |
|
|
|
/** |
|
* mesh_path_start_discovery - launch a path discovery from the PREQ queue |
|
* |
|
* @sdata: local mesh subif |
|
*/ |
|
void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
|
{ |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
struct mesh_preq_queue *preq_node; |
|
struct mesh_path *mpath; |
|
u8 ttl, target_flags = 0; |
|
const u8 *da; |
|
u32 lifetime; |
|
|
|
spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
|
if (!ifmsh->preq_queue_len || |
|
time_before(jiffies, ifmsh->last_preq + |
|
min_preq_int_jiff(sdata))) { |
|
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
|
return; |
|
} |
|
|
|
preq_node = list_first_entry(&ifmsh->preq_queue.list, |
|
struct mesh_preq_queue, list); |
|
list_del(&preq_node->list); |
|
--ifmsh->preq_queue_len; |
|
spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
|
|
|
rcu_read_lock(); |
|
mpath = mesh_path_lookup(sdata, preq_node->dst); |
|
if (!mpath) |
|
goto enddiscovery; |
|
|
|
spin_lock_bh(&mpath->state_lock); |
|
if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) { |
|
spin_unlock_bh(&mpath->state_lock); |
|
goto enddiscovery; |
|
} |
|
mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
|
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; |
|
} |
|
|
|
ifmsh->last_preq = jiffies; |
|
|
|
if (time_after(jiffies, ifmsh->last_sn_update + |
|
net_traversal_jiffies(sdata)) || |
|
time_before(jiffies, ifmsh->last_sn_update)) { |
|
++ifmsh->sn; |
|
sdata->u.mesh.last_sn_update = jiffies; |
|
} |
|
lifetime = default_lifetime(sdata); |
|
ttl = sdata->u.mesh.mshcfg.element_ttl; |
|
if (ttl == 0) { |
|
sdata->u.mesh.mshstats.dropped_frames_ttl++; |
|
spin_unlock_bh(&mpath->state_lock); |
|
goto enddiscovery; |
|
} |
|
|
|
if (preq_node->flags & PREQ_Q_F_REFRESH) |
|
target_flags |= IEEE80211_PREQ_TO_FLAG; |
|
else |
|
target_flags &= ~IEEE80211_PREQ_TO_FLAG; |
|
|
|
spin_unlock_bh(&mpath->state_lock); |
|
da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
|
mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, |
|
target_flags, mpath->dst, mpath->sn, da, 0, |
|
ttl, lifetime, 0, ifmsh->preq_id++, sdata); |
|
|
|
spin_lock_bh(&mpath->state_lock); |
|
if (!(mpath->flags & MESH_PATH_DELETED)) |
|
mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
|
spin_unlock_bh(&mpath->state_lock); |
|
|
|
enddiscovery: |
|
rcu_read_unlock(); |
|
kfree(preq_node); |
|
} |
|
|
|
/** |
|
* mesh_nexthop_resolve - lookup next hop; conditionally start path discovery |
|
* |
|
* @skb: 802.11 frame to be sent |
|
* @sdata: network subif the frame will be sent through |
|
* |
|
* Lookup next hop for given skb and start path discovery if no |
|
* forwarding information is found. |
|
* |
|
* Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
|
* skb is freed here if no mpath could be allocated. |
|
*/ |
|
int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
|
struct sk_buff *skb) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
|
struct mesh_path *mpath; |
|
struct sk_buff *skb_to_free = NULL; |
|
u8 *target_addr = hdr->addr3; |
|
|
|
/* Nulls are only sent to peers for PS and should be pre-addressed */ |
|
if (ieee80211_is_qos_nullfunc(hdr->frame_control)) |
|
return 0; |
|
|
|
/* Allow injected packets to bypass mesh routing */ |
|
if (info->control.flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) |
|
return 0; |
|
|
|
if (!mesh_nexthop_lookup(sdata, skb)) |
|
return 0; |
|
|
|
/* no nexthop found, start resolving */ |
|
mpath = mesh_path_lookup(sdata, target_addr); |
|
if (!mpath) { |
|
mpath = mesh_path_add(sdata, target_addr); |
|
if (IS_ERR(mpath)) { |
|
mesh_path_discard_frame(sdata, skb); |
|
return PTR_ERR(mpath); |
|
} |
|
} |
|
|
|
if (!(mpath->flags & MESH_PATH_RESOLVING) && |
|
mesh_path_sel_is_hwmp(sdata)) |
|
mesh_queue_preq(mpath, PREQ_Q_F_START); |
|
|
|
if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) |
|
skb_to_free = skb_dequeue(&mpath->frame_queue); |
|
|
|
info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; |
|
ieee80211_set_qos_hdr(sdata, skb); |
|
skb_queue_tail(&mpath->frame_queue, skb); |
|
if (skb_to_free) |
|
mesh_path_discard_frame(sdata, skb_to_free); |
|
|
|
return -ENOENT; |
|
} |
|
|
|
/** |
|
* mesh_nexthop_lookup_nolearn - try to set next hop without path discovery |
|
* @skb: 802.11 frame to be sent |
|
* @sdata: network subif the frame will be sent through |
|
* |
|
* Check if the meshDA (addr3) of a unicast frame is a direct neighbor. |
|
* And if so, set the RA (addr1) to it to transmit to this node directly, |
|
* avoiding PREQ/PREP path discovery. |
|
* |
|
* Returns: 0 if the next hop was found and -ENOENT otherwise. |
|
*/ |
|
static int mesh_nexthop_lookup_nolearn(struct ieee80211_sub_if_data *sdata, |
|
struct sk_buff *skb) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
|
struct sta_info *sta; |
|
|
|
if (is_multicast_ether_addr(hdr->addr1)) |
|
return -ENOENT; |
|
|
|
rcu_read_lock(); |
|
sta = sta_info_get(sdata, hdr->addr3); |
|
|
|
if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { |
|
rcu_read_unlock(); |
|
return -ENOENT; |
|
} |
|
rcu_read_unlock(); |
|
|
|
memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); |
|
memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); |
|
return 0; |
|
} |
|
|
|
/** |
|
* mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling |
|
* this function is considered "using" the associated mpath, so preempt a path |
|
* refresh if this mpath expires soon. |
|
* |
|
* @skb: 802.11 frame to be sent |
|
* @sdata: network subif the frame will be sent through |
|
* |
|
* Returns: 0 if the next hop was found. Nonzero otherwise. |
|
*/ |
|
int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
|
struct sk_buff *skb) |
|
{ |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
struct mesh_path *mpath; |
|
struct sta_info *next_hop; |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
|
u8 *target_addr = hdr->addr3; |
|
|
|
if (ifmsh->mshcfg.dot11MeshNolearn && |
|
!mesh_nexthop_lookup_nolearn(sdata, skb)) |
|
return 0; |
|
|
|
mpath = mesh_path_lookup(sdata, target_addr); |
|
if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) |
|
return -ENOENT; |
|
|
|
if (time_after(jiffies, |
|
mpath->exp_time - |
|
msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && |
|
ether_addr_equal(sdata->vif.addr, hdr->addr4) && |
|
!(mpath->flags & MESH_PATH_RESOLVING) && |
|
!(mpath->flags & MESH_PATH_FIXED)) |
|
mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
|
|
|
next_hop = rcu_dereference(mpath->next_hop); |
|
if (next_hop) { |
|
memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); |
|
memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); |
|
ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); |
|
return 0; |
|
} |
|
|
|
return -ENOENT; |
|
} |
|
|
|
void mesh_path_timer(struct timer_list *t) |
|
{ |
|
struct mesh_path *mpath = from_timer(mpath, t, timer); |
|
struct ieee80211_sub_if_data *sdata = mpath->sdata; |
|
int ret; |
|
|
|
if (sdata->local->quiescing) |
|
return; |
|
|
|
spin_lock_bh(&mpath->state_lock); |
|
if (mpath->flags & MESH_PATH_RESOLVED || |
|
(!(mpath->flags & MESH_PATH_RESOLVING))) { |
|
mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
|
spin_unlock_bh(&mpath->state_lock); |
|
} else if (mpath->discovery_retries < max_preq_retries(sdata)) { |
|
++mpath->discovery_retries; |
|
mpath->discovery_timeout *= 2; |
|
mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
|
spin_unlock_bh(&mpath->state_lock); |
|
mesh_queue_preq(mpath, 0); |
|
} else { |
|
mpath->flags &= ~(MESH_PATH_RESOLVING | |
|
MESH_PATH_RESOLVED | |
|
MESH_PATH_REQ_QUEUED); |
|
mpath->exp_time = jiffies; |
|
spin_unlock_bh(&mpath->state_lock); |
|
if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { |
|
ret = mesh_path_send_to_gates(mpath); |
|
if (ret) |
|
mhwmp_dbg(sdata, "no gate was reachable\n"); |
|
} else |
|
mesh_path_flush_pending(mpath); |
|
} |
|
} |
|
|
|
void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) |
|
{ |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
|
u8 flags, target_flags = 0; |
|
|
|
flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
|
? RANN_FLAG_IS_GATE : 0; |
|
|
|
switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { |
|
case IEEE80211_PROACTIVE_RANN: |
|
mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, |
|
++ifmsh->sn, 0, NULL, 0, broadcast_addr, |
|
0, ifmsh->mshcfg.element_ttl, |
|
interval, 0, 0, sdata); |
|
break; |
|
case IEEE80211_PROACTIVE_PREQ_WITH_PREP: |
|
flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; |
|
fallthrough; |
|
case IEEE80211_PROACTIVE_PREQ_NO_PREP: |
|
interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; |
|
target_flags |= IEEE80211_PREQ_TO_FLAG | |
|
IEEE80211_PREQ_USN_FLAG; |
|
mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, |
|
++ifmsh->sn, target_flags, |
|
(u8 *) broadcast_addr, 0, broadcast_addr, |
|
0, ifmsh->mshcfg.element_ttl, interval, |
|
0, ifmsh->preq_id++, sdata); |
|
break; |
|
default: |
|
mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
|
return; |
|
} |
|
}
|
|
|