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mac80211: fix the mesh channel switch support

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Mesh STA receiving the mesh CSA action frame is not able to trigger
the mesh channel switch due to the incorrect handling and comparison
of mesh channel switch parameters element (MCSP)'s TTL. Make sure
the MCSP's TTL is updated accordingly before calling the
ieee80211_mesh_process_chnswitch. Also, we update the beacon before
forwarding the CSA action frame, so MCSP's precedence value and
initiator flag need to be updated prior to this.

Signed-off-by: Chun-Yeow Yeoh <yeohchunyeow@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Chun-Yeow Yeoh 2013-11-08 15:09:43 +08:00 committed by Johannes Berg
parent 051a41fa4e
commit 3f718fd840
5 changed files with 24 additions and 14 deletions
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10
net/mac80211/cfg.c
View File

@ -3119,9 +3119,17 @@ static int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
params->chandef.chan->band)
return -EINVAL;
ifmsh->chsw_init = true;
if (!ifmsh->pre_value)
ifmsh->pre_value = 1;
else
ifmsh->pre_value++;
err = ieee80211_mesh_csa_beacon(sdata, params, true);
if (err < 0)
if (err < 0) {
ifmsh->chsw_init = false;
return err;
}
break;
#endif
default:

1
net/mac80211/ieee80211_i.h
View File

@ -1228,6 +1228,7 @@ struct ieee80211_csa_ie {
u8 mode;
u8 count;
u8 ttl;
u16 pre_value;
};
/* Parsed Information Elements */

20
net/mac80211/mesh.c
View File

@ -943,14 +943,19 @@ ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
params.chandef.chan->center_freq);
params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
if (beacon)
if (beacon) {
ifmsh->chsw_ttl = csa_ie.ttl - 1;
else
ifmsh->chsw_ttl = 0;
if (ifmsh->pre_value >= csa_ie.pre_value)
return false;
ifmsh->pre_value = csa_ie.pre_value;
}
if (ifmsh->chsw_ttl > 0)
if (ifmsh->chsw_ttl < ifmsh->mshcfg.dot11MeshTTL) {
if (ieee80211_mesh_csa_beacon(sdata, &params, false) < 0)
return false;
} else {
return false;
}
sdata->csa_radar_required = params.radar_required;
@ -1163,7 +1168,6 @@ static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
offset_ttl = (len < 42) ? 7 : 10;
*(pos + offset_ttl) -= 1;
*(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
sdata->u.mesh.chsw_ttl = *(pos + offset_ttl);
memcpy(mgmt_fwd, mgmt, len);
eth_broadcast_addr(mgmt_fwd->da);
@ -1182,7 +1186,7 @@ static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
u16 pre_value;
bool fwd_csa = true;
size_t baselen;
u8 *pos, ttl;
u8 *pos;
if (mgmt->u.action.u.measurement.action_code !=
WLAN_ACTION_SPCT_CHL_SWITCH)
@ -1193,8 +1197,8 @@ static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
u.action.u.chan_switch.variable);
ieee802_11_parse_elems(pos, len - baselen, false, &elems);
ttl = elems.mesh_chansw_params_ie->mesh_ttl;
if (!--ttl)
ifmsh->chsw_ttl = elems.mesh_chansw_params_ie->mesh_ttl;
if (!--ifmsh->chsw_ttl)
fwd_csa = false;
pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);

2
net/mac80211/spectmgmt.c
View File

@ -78,6 +78,8 @@ int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
if (elems->mesh_chansw_params_ie) {
csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
csa_ie->pre_value = le16_to_cpu(
elems->mesh_chansw_params_ie->mesh_pre_value);
}
new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);

5
net/mac80211/util.c
View File

@ -2457,14 +2457,9 @@ int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
pos += 2;
if (!ifmsh->pre_value)
ifmsh->pre_value = 1;
else
ifmsh->pre_value++;
pre_value = cpu_to_le16(ifmsh->pre_value);
memcpy(pos, &pre_value, 2); /* Precedence Value */
pos += 2;
ifmsh->chsw_init = true;
}
ieee80211_tx_skb(sdata, skb);