scan.c revision 6d3560d4fc9c5b9fe1a07a63926ea70512c69c32
10a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg/* 25484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg * Scanning implementation 35484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg * 40a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 50a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2004, Instant802 Networks, Inc. 60a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2005, Devicescape Software, Inc. 70a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 80a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 90a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * 100a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * This program is free software; you can redistribute it and/or modify 110a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * it under the terms of the GNU General Public License version 2 as 120a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg * published by the Free Software Foundation. 130a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg */ 140a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 150a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include <linux/wireless.h> 160a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include <linux/if_arp.h> 17078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg#include <linux/rtnetlink.h> 180a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include <net/mac80211.h> 190a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 200a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#include "ieee80211_i.h" 212448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg#include "driver-ops.h" 225484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg#include "mesh.h" 230a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 240a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#define IEEE80211_PROBE_DELAY (HZ / 33) 250a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg#define IEEE80211_CHANNEL_TIME (HZ / 33) 2696f7e73938da744e718ce4817dd3e7e424624654Helmut Schaa#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8) 270a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 28c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergstruct ieee80211_bss * 295484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq, 305484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg u8 *ssid, u8 ssid_len) 315484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 3200d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg return (void *)cfg80211_get_bss(local->hw.wiphy, 3300d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg ieee80211_get_channel(local->hw.wiphy, 3400d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg freq), 3500d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg bssid, ssid, ssid_len, 3600d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg 0, 0); 375484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 385484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 3900d3f14cf9f12c21428121026a5e1d5f65926447Johannes Bergstatic void ieee80211_rx_bss_free(struct cfg80211_bss *cbss) 405484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 4100d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg struct ieee80211_bss *bss = (void *)cbss; 425484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 435484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg kfree(bss_mesh_id(bss)); 445484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg kfree(bss_mesh_cfg(bss)); 455484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 465484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 475484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergvoid ieee80211_rx_bss_put(struct ieee80211_local *local, 48c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss) 495484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 5000d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg cfg80211_put_bss((struct cfg80211_bss *)bss); 515484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 525484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 53c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergstruct ieee80211_bss * 545484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Bergieee80211_bss_info_update(struct ieee80211_local *local, 555484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_rx_status *rx_status, 565484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_mgmt *mgmt, 575484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg size_t len, 585484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee802_11_elems *elems, 592a5193119269062608582418deba7af82844159aJohannes Berg struct ieee80211_channel *channel, 602a5193119269062608582418deba7af82844159aJohannes Berg bool beacon) 615484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg{ 62c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 6300d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg int clen; 642a5193119269062608582418deba7af82844159aJohannes Berg s32 signal = 0; 652a5193119269062608582418deba7af82844159aJohannes Berg 6677965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) 672a5193119269062608582418deba7af82844159aJohannes Berg signal = rx_status->signal * 100; 6877965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) 692a5193119269062608582418deba7af82844159aJohannes Berg signal = (rx_status->signal * 100) / local->hw.max_signal; 702a5193119269062608582418deba7af82844159aJohannes Berg 7100d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg bss = (void *)cfg80211_inform_bss_frame(local->hw.wiphy, channel, 7277965c970d7da9c9b6349ff2b1d9adecf54c403bJohannes Berg mgmt, len, signal, GFP_ATOMIC); 735484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 7400d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg if (!bss) 7500d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg return NULL; 7600d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg 7700d3f14cf9f12c21428121026a5e1d5f65926447Johannes Berg bss->cbss.free_priv = ieee80211_rx_bss_free; 785484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 795484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg /* save the ERP value so that it is available at association time */ 805484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->erp_info && elems->erp_info_len >= 1) { 815484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->erp_value = elems->erp_info[0]; 825484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->has_erp_value = 1; 835484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 845484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 855484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->tim) { 865484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg struct ieee80211_tim_ie *tim_ie = 875484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg (struct ieee80211_tim_ie *)elems->tim; 885484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->dtim_period = tim_ie->dtim_period; 895484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 905484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 916a211bf1fc63891bfbc510d9caa751c4dee4bc37Johannes Berg /* set default value for buggy AP/no TIM element */ 926a211bf1fc63891bfbc510d9caa751c4dee4bc37Johannes Berg if (bss->dtim_period == 0) 935484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->dtim_period = 1; 945484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 955484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->supp_rates_len = 0; 965484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->supp_rates) { 975484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; 985484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (clen > elems->supp_rates_len) 995484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen = elems->supp_rates_len; 1005484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates, 1015484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen); 1025484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->supp_rates_len += clen; 1035484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1045484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (elems->ext_supp_rates) { 1055484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len; 1065484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (clen > elems->ext_supp_rates_len) 1075484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg clen = elems->ext_supp_rates_len; 1085484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg memcpy(&bss->supp_rates[bss->supp_rates_len], 1095484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg elems->ext_supp_rates, clen); 1105484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->supp_rates_len += clen; 1115484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg } 1125484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1135484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->wmm_used = elems->wmm_param || elems->wmm_info; 1145484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1155484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg if (!beacon) 1165484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg bss->last_probe_resp = jiffies; 1175484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg 1185484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg return bss; 1195484e23749e78d5a4f56928efaf3c4b0d862b7a6Johannes Berg} 1200a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 12198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Bergieee80211_rx_result 122f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Bergieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) 12398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg{ 124f1d58c2521eb160178b2151d6326d8dc5d7c8560Johannes Berg struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); 12598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_mgmt *mgmt; 126c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Berg struct ieee80211_bss *bss; 12798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg u8 *elements; 12898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee80211_channel *channel; 12998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg size_t baselen; 13098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg int freq; 13198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg __le16 fc; 13298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg bool presp, beacon = false; 13398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg struct ieee802_11_elems elems; 13498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 13598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (skb->len < 2) 13698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_UNUSABLE; 13798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 13898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt = (struct ieee80211_mgmt *) skb->data; 13998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg fc = mgmt->frame_control; 14098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 14198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (ieee80211_is_ctl(fc)) 14298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_CONTINUE; 14398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 14498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (skb->len < 24) 14598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 14698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 14798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg presp = ieee80211_is_probe_resp(fc); 14898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (presp) { 14998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg /* ignore ProbeResp to foreign address */ 15098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) 15198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 15298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 15398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg presp = true; 15498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.probe_resp.variable; 15598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); 15698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } else { 15798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg beacon = ieee80211_is_beacon(fc); 15898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); 15998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg elements = mgmt->u.beacon.variable; 16098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg } 16198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!presp && !beacon) 16398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_CONTINUE; 16498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (baselen > skb->len) 16698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 16798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 16898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg ieee802_11_parse_elems(elements, skb->len - baselen, &elems); 16998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 17098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (elems.ds_params && elems.ds_params_len == 1) 17198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg freq = ieee80211_channel_to_frequency(elems.ds_params[0]); 17298c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg else 17398c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg freq = rx_status->freq; 17498c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 17598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq); 17698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 17798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 17898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_DROP_MONITOR; 17998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18098c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg bss = ieee80211_bss_info_update(sdata->local, rx_status, 18198c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg mgmt, skb->len, &elems, 1822a5193119269062608582418deba7af82844159aJohannes Berg channel, beacon); 183d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen if (bss) 184d048e503a2b01e771ee87921c24d89d7ec3f0c2fJouni Malinen ieee80211_rx_bss_put(sdata->local, bss); 18598c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 18698c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg dev_kfree_skb(skb); 18798c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg return RX_QUEUED; 18898c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg} 18998c8fccfaea838e62ffde2f2e44568844e0e5472Johannes Berg 1904d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg/* return false if no more work */ 1914d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Bergstatic bool ieee80211_prep_hw_scan(struct ieee80211_local *local) 1924d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg{ 1934d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 1944d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg enum ieee80211_band band; 1954d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg int i, ielen, n_chans; 1964d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 1974d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg do { 1984d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_band == IEEE80211_NUM_BANDS) 1994d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return false; 2004d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2014d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg band = local->hw_scan_band; 2024d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans = 0; 2034d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg for (i = 0; i < req->n_channels; i++) { 2044d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (req->channels[i]->band == band) { 2054d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->channels[n_chans] = 2064d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->channels[i]; 2074d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg n_chans++; 2084d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2094d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 2104d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2114d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band++; 2124d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } while (!n_chans); 2134d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2144d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_channels = n_chans; 2154d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2164d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, 2174d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->ie, req->ie_len, band); 2184d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie_len = ielen; 2194d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2204d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return true; 2214d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg} 2224d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2239050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo/* 2249050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * inform AP that we will go to sleep so that it will buffer the frames 2259050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * while we scan 2269050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo */ 2279050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valostatic void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data *sdata) 2289050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo{ 2299050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo struct ieee80211_local *local = sdata->local; 2309050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo bool ps = false; 2319050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2329050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo /* FIXME: what to do when local->pspolling is true? */ 2339050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2349050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo del_timer_sync(&local->dynamic_ps_timer); 2359050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo cancel_work_sync(&local->dynamic_ps_enable_work); 2369050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2379050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2389050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ps = true; 2399050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2409050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2419050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo } 2429050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2439050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo if (!ps || !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) 2449050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo /* 2459050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * If power save was enabled, no need to send a nullfunc 2469050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * frame because AP knows that we are sleeping. But if the 2479050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * hardware is creating the nullfunc frame for power save 2489050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not 2499050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * enabled) and power save was enabled, the firmware just 2509050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * sent a null frame with power save disabled. So we need 2519050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * to send a new nullfunc frame to inform the AP that we 2529050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * are again sleeping. 2539050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo */ 2549050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_send_nullfunc(local, sdata, 1); 2559050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo} 2569050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2579050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo/* inform AP that we are awake again, unless power save is enabled */ 2589050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valostatic void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata) 2599050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo{ 2609050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo struct ieee80211_local *local = sdata->local; 2619050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 262965bedadc01d34027455d5d5b67063ef0209c955Johannes Berg if (!local->ps_sdata) 2639050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_send_nullfunc(local, sdata, 0); 2649050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo else { 2659050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo /* 2669050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware 2679050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * will send a nullfunc frame with the powersave bit set 2689050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * even though the AP already knows that we are sleeping. 2699050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * This could be avoided by sending a null frame with power 2709050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * save bit disabled before enabling the power save, but 2719050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * this doesn't gain anything. 2729050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * 2739050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need 2749050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * to send a nullfunc frame because AP already knows that 2759050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * we are sleeping, let's just enable power save mode in 2769050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * hardware. 2779050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo */ 2789050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo local->hw.conf.flags |= IEEE80211_CONF_PS; 2799050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2809050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo } 2819050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo} 2829050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2832a5193119269062608582418deba7af82844159aJohannes Bergvoid ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 2840a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 2850a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = hw_to_local(hw); 2860a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_sub_if_data *sdata; 287f3b85252f081581a8f257545ed748062dce7798bJohannes Berg bool was_hw_scan; 2880a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 289f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 2905bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 2916d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg /* 2926d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * It's ok to abort a not-yet-running scan (that 2936d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * we have one at all will be verified by checking 2946d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * local->scan_req next), but not to complete it 2956d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * successfully. 2966d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg */ 2976d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg if (WARN_ON(!local->scanning && !aborted)) 2986d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg aborted = true; 2995bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 300f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (WARN_ON(!local->scan_req)) { 301f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 302f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 303de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg } 304de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 3054d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 3064d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { 3074d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ieee80211_queue_delayed_work(&local->hw, 3084d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg &local->scan_work, 0); 3094d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg mutex_unlock(&local->scan_mtx); 3104d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return; 3114d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 3124d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 3134d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 3144d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 315f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3165ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (local->scan_req != local->int_scan_req) 3172a5193119269062608582418deba7af82844159aJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 3182a5193119269062608582418deba7af82844159aJohannes Berg local->scan_req = NULL; 31915db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 3202a5193119269062608582418deba7af82844159aJohannes Berg 321fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 32258905ca5b11a0ff3860f55b789cbbf052f7158a7Johannes Berg local->scan_channel = NULL; 323f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 324f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* we only have to protect scan_req and hw/sw scan */ 325f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 326f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 327e8975581f63870be42ff4662b293d1b0c8c21350Johannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 3285cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg if (was_hw_scan) 3295cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg goto done; 3300a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3313ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 3320a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3332448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_complete(local); 33480e775bf08f1915870fbb0c1c7a45a3fdc291721Michael Buesch 335078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg mutex_lock(&local->iflist_mtx); 336078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg list_for_each_entry(sdata, &local->interfaces, list) { 337fb9ddbf086591ab4c90c44d10468f84d465b3fdfJohannes Berg if (!netif_running(sdata->dev)) 338fb9ddbf086591ab4c90c44d10468f84d465b3fdfJohannes Berg continue; 339fb9ddbf086591ab4c90c44d10468f84d465b3fdfJohannes Berg 3400a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg /* Tell AP we're back */ 34105c914fe330fa8e1cc67870dc0d3809dfd96c107Johannes Berg if (sdata->vif.type == NL80211_IFTYPE_STATION) { 34277fdaa12cea26c204cc12c312fe40bc0f3dcdfd8Johannes Berg if (sdata->u.mgd.associated) { 3439050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_scan_ps_disable(sdata); 34453623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_wake_queue(sdata->dev); 3450a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg } 3460a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg } else 34753623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_wake_queue(sdata->dev); 348078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg 34914b80724367dfdc86f4807461dd1f7f2dd630416Johannes Berg /* re-enable beaconing */ 35014b80724367dfdc86f4807461dd1f7f2dd630416Johannes Berg if (sdata->vif.type == NL80211_IFTYPE_AP || 35114b80724367dfdc86f4807461dd1f7f2dd630416Johannes Berg sdata->vif.type == NL80211_IFTYPE_ADHOC || 35214b80724367dfdc86f4807461dd1f7f2dd630416Johannes Berg sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3532d0ddec5b2b859f06116f631fc0ffe94fbceb556Johannes Berg ieee80211_bss_info_change_notify( 3542d0ddec5b2b859f06116f631fc0ffe94fbceb556Johannes Berg sdata, BSS_CHANGED_BEACON_ENABLED); 3550a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg } 356078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg mutex_unlock(&local->iflist_mtx); 3570a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3580a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg done: 3595cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 3600a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg ieee80211_mlme_notify_scan_completed(local); 361469002983fc90c2ff0959e2b03335c0fe2e4d5a9Johannes Berg ieee80211_ibss_notify_scan_completed(local); 362472dbc45dc1966284de72d7de15690c17ed2cf33Johannes Berg ieee80211_mesh_notify_scan_completed(local); 3630a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 3640a51b27e956bd9580296c48191b78175ed8b5971Johannes BergEXPORT_SYMBOL(ieee80211_scan_completed); 3650a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 366f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int ieee80211_start_sw_scan(struct ieee80211_local *local) 367f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 368f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_sub_if_data *sdata; 369f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 370f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 371f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 372f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * scanning instead. First send a nullfunc frame with power save 373f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * bit on so that AP will buffer the frames for us while we are not 374f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * listening, then send probe requests to each channel and wait for 375f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * the responses. After all channels are scanned, tune back to the 376f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * original channel and send a nullfunc frame with power save bit 377f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * off to trigger the AP to send us all the buffered frames. 378f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 379f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Note that while local->sw_scanning is true everything else but 380f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * nullfunc frames and probe requests will be dropped in 381f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * ieee80211_tx_h_check_assoc(). 382f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 3832448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_start(local); 384f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 385f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->iflist_mtx); 386f3b85252f081581a8f257545ed748062dce7798bJohannes Berg list_for_each_entry(sdata, &local->interfaces, list) { 387f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (!netif_running(sdata->dev)) 388f3b85252f081581a8f257545ed748062dce7798bJohannes Berg continue; 389f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 390f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* disable beaconing */ 391f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (sdata->vif.type == NL80211_IFTYPE_AP || 392f3b85252f081581a8f257545ed748062dce7798bJohannes Berg sdata->vif.type == NL80211_IFTYPE_ADHOC || 393f3b85252f081581a8f257545ed748062dce7798bJohannes Berg sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3942d0ddec5b2b859f06116f631fc0ffe94fbceb556Johannes Berg ieee80211_bss_info_change_notify( 3952d0ddec5b2b859f06116f631fc0ffe94fbceb556Johannes Berg sdata, BSS_CHANGED_BEACON_ENABLED); 396f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 397142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 398142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * only handle non-STA interfaces here, STA interfaces 399142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * are handled in the scan state machine 400142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 401142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type != NL80211_IFTYPE_STATION) 40253623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_stop_queue(sdata->dev); 403f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 404f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->iflist_mtx); 405f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 406977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 407f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_channel_idx = 0; 408f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4093ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 410f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 411f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* TODO: start scan as soon as all nullfunc frames are ACKed */ 41242935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 41342935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez &local->scan_work, 41442935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez IEEE80211_CHANNEL_TIME); 415f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 416f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 417f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 418f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 419f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 420f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 421f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 422f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 423f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_local *local = sdata->local; 424f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 425f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 426f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 427f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 428f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -EBUSY; 429f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 430f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) { 431f3b85252f081581a8f257545ed748062dce7798bJohannes Berg u8 *ies; 432f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4334d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = kmalloc( 4344d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 4354d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]) + 4364d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + 4374d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->ie_len, GFP_KERNEL); 4384d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (!local->hw_scan_req) 439f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -ENOMEM; 440f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4414d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ssids = req->ssids; 4424d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 4434d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ies = (u8 *)local->hw_scan_req + 4444d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 4454d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]); 4464d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie = ies; 4474d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 4484d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band = 0; 449f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 450f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 451f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = req; 452f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_sdata = sdata; 453f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4545ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (req != local->int_scan_req && 455f3b85252f081581a8f257545ed748062dce7798bJohannes Berg sdata->vif.type == NL80211_IFTYPE_STATION && 45677fdaa12cea26c204cc12c312fe40bc0f3dcdfd8Johannes Berg !list_empty(&ifmgd->work_list)) { 45777fdaa12cea26c204cc12c312fe40bc0f3dcdfd8Johannes Berg /* actually wait for the work it's doing to finish/time out */ 458f3b85252f081581a8f257545ed748062dce7798bJohannes Berg set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request); 459f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 460f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 461f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 462f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) 463fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 464f3b85252f081581a8f257545ed748062dce7798bJohannes Berg else 465fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 466f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 467f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Kicking off the scan need not be protected, 468f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * only the scan variable stuff, since now 469f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * local->scan_req is assigned and other callers 470f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * will abort their scan attempts. 471f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 472f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * This avoids getting a scan_mtx -> iflist_mtx 473f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * dependency, so that the scan completed calls 474f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * have more locking freedom. 475f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 4765cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 4775cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 478f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 479f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4804d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->ops->hw_scan) { 4814d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 4824d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg rc = drv_hw_scan(local, local->hw_scan_req); 4834d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } else 484f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = ieee80211_start_sw_scan(local); 485f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 486f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 487f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 488f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) { 4894d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 4904d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 491fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 492f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4935cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 4945cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 495f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 496f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_sdata = NULL; 497f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 498f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 499f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return rc; 500f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 501f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5022fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic int ieee80211_scan_state_decision(struct ieee80211_local *local, 5032fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 5047d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 505142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa bool associated = false; 506142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 507142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 508142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* if no more bands/channels left, complete scan and advance to the idle state */ 5097d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (local->scan_channel_idx >= local->scan_req->n_channels) { 5107d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa ieee80211_scan_completed(&local->hw, false); 5117d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa return 1; 5127d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 5132fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 514142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* check if at least one STA interface is associated */ 515142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 516142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 517142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (!netif_running(sdata->dev)) 518142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 519142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 520142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 521142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) { 522142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa associated = true; 523142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 524142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 525142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 526142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 527142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 528142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 529142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (local->scan_channel) { 530142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 531142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * we're currently scanning a different channel, let's 532142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * switch back to the operating channel now if at least 533142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * one interface is associated. Otherwise just scan the 534142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * next channel 535142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 536142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (associated) 537977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; 538142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa else 539977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 540142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } else { 541142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 542142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * we're on the operating channel currently, let's 543142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * leave that channel now to scan another one 544142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 545977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; 546142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 547142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 5482fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa *next_delay = 0; 5492fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return 0; 5502fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa} 5512fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 552142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaastatic void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, 553142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa unsigned long *next_delay) 554142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa{ 555142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 556142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 557142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 558142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * notify the AP about us leaving the channel and stop all STA interfaces 559142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 560142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 561142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 562142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (!netif_running(sdata->dev)) 563142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 564142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 565142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 56653623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_stop_queue(sdata->dev); 567142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) 568142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_ps_enable(sdata); 569142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 570142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 571142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 572142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 573142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa __set_bit(SCAN_OFF_CHANNEL, &local->scanning); 574142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 575142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* advance to the next channel to be scanned */ 576142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa *next_delay = HZ / 10; 577977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 578142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 579142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 580142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaastatic void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, 581142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa unsigned long *next_delay) 582142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa{ 583142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 584142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 585142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* switch back to the operating channel */ 586142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa local->scan_channel = NULL; 587142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 588142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 589142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 590142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * notify the AP about us being back and restart all STA interfaces 591142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 592142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 593142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 594142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (!netif_running(sdata->dev)) 595142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 596142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 597142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* Tell AP we're back */ 598142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 599142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) 600142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_ps_disable(sdata); 60153623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_wake_queue(sdata->dev); 602142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 603142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 604142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 605142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 606142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); 607142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 608142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa *next_delay = HZ / 5; 609977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 610142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 611142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 6122fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 6132fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 6142fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa{ 6152fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa int skip; 6162fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa struct ieee80211_channel *chan; 6172fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 6182fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 6197d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 0; 6207d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 6217d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6227d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (chan->flags & IEEE80211_CHAN_DISABLED || 6237d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa (sdata->vif.type == NL80211_IFTYPE_ADHOC && 6247d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa chan->flags & IEEE80211_CHAN_NO_IBSS)) 6257d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 1; 6267d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6277d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (!skip) { 6287d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_channel = chan; 6297d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (ieee80211_hw_config(local, 6307d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa IEEE80211_CONF_CHANGE_CHANNEL)) 6317d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 1; 6327d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 6337d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6347d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* advance state machine to next channel/band */ 6357d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_channel_idx++; 6367d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6370ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa if (skip) { 6380ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa /* if we skip this channel return to the decision state */ 6390ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa local->next_scan_state = SCAN_DECISION; 6402fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6410ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa } 6427d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6437d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6447d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 6457d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 6467d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * but it waits for the probe delay or until a frame is 6477d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received - and the received frame would update the NAV). 6487d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * For now, we do not support waiting until a frame is 6497d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received. 6507d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * 6517d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * In any case, it is not necessary for a passive scan. 6527d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6537d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 6547d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa !local->scan_req->n_ssids) { 6557d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 656977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6572fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6587d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 6597d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6602fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa /* active scan, send probes */ 6617d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 662977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 6637d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6647d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6657d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaastatic void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 6667d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa unsigned long *next_delay) 6677d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 6687d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa int i; 6697d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 6707d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6717d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa for (i = 0; i < local->scan_req->n_ssids; i++) 6727d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa ieee80211_send_probe_req( 6737d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa sdata, NULL, 6747d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ssids[i].ssid, 6757d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ssids[i].ssid_len, 6767d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ie, local->scan_req->ie_len); 6777d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6787d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6797d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * After sending probe requests, wait for probe responses 6807d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * on the channel. 6817d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6827d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_CHANNEL_TIME; 683977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6847d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6857d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 686c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergvoid ieee80211_scan_work(struct work_struct *work) 6870a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 6880a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = 6890a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg container_of(work, struct ieee80211_local, scan_work.work); 6900a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_sub_if_data *sdata = local->scan_sdata; 6910a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg unsigned long next_delay = 0; 6920a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 693f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 694f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (!sdata || !local->scan_req) { 695f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 696f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 697f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 698f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 6994d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_req) { 7004d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg int rc = drv_hw_scan(local, local->hw_scan_req); 7014d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg mutex_unlock(&local->scan_mtx); 7024d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (rc) 7034d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ieee80211_scan_completed(&local->hw, true); 7044d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return; 7054d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 7064d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 707fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa if (local->scan_req && !local->scanning) { 708f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 709f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 710f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 711f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 71215db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 713f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 714f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = __ieee80211_start_scan(sdata, req); 715f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 716f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 717f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) 718f3b85252f081581a8f257545ed748062dce7798bJohannes Berg ieee80211_scan_completed(&local->hw, true); 719f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 720f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 721f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 722f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 723f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 7245bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg /* 7255bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg * Avoid re-scheduling when the sdata is going away. 7265bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg */ 727f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (!netif_running(sdata->dev)) { 728f3b85252f081581a8f257545ed748062dce7798bJohannes Berg ieee80211_scan_completed(&local->hw, true); 7290a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg return; 730f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 7310a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 732f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa /* 733f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * as long as no delay is required advance immediately 734f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * without scheduling a new work 735f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa */ 736f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa do { 737977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa switch (local->next_scan_state) { 7382fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_DECISION: 7392fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa if (ieee80211_scan_state_decision(local, &next_delay)) 740f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa return; 741f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 7422fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_SET_CHANNEL: 7432fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 7442fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa break; 745f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa case SCAN_SEND_PROBE: 746f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 747f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 748142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa case SCAN_LEAVE_OPER_CHANNEL: 749142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_state_leave_oper_channel(local, &next_delay); 750142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 751142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa case SCAN_ENTER_OPER_CHANNEL: 752142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_state_enter_oper_channel(local, &next_delay); 753142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 754f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } 755f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } while (next_delay == 0); 7560a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 75742935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 7580a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7590a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 760f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 761f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 7620a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 763f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int res; 764de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 765f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&sdata->local->scan_mtx); 766f3b85252f081581a8f257545ed748062dce7798bJohannes Berg res = __ieee80211_start_scan(sdata, req); 767f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&sdata->local->scan_mtx); 7680a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 769f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return res; 7700a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7710a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 772f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 773f3b85252f081581a8f257545ed748062dce7798bJohannes Berg const u8 *ssid, u8 ssid_len) 7740a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 7750a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = sdata->local; 776f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int ret = -EBUSY; 7772a5193119269062608582418deba7af82844159aJohannes Berg 778f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 7790a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 780f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* busy scanning */ 781f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 782f3b85252f081581a8f257545ed748062dce7798bJohannes Berg goto unlock; 7839116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 7845ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 7855ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 7869116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 7875ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 788f3b85252f081581a8f257545ed748062dce7798bJohannes Berg unlock: 789f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 790f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return ret; 7910a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7925bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 7935bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Bergvoid ieee80211_scan_cancel(struct ieee80211_local *local) 7945bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg{ 79515db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg bool abortscan; 7965bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 7975bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg cancel_delayed_work_sync(&local->scan_work); 7985bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 7995bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg /* 8005bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg * Only call this function when a scan can't be 8015bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg * queued -- mostly at suspend under RTNL. 8025bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg */ 8035bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg mutex_lock(&local->scan_mtx); 80415db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) || 80515db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg (!local->scanning && local->scan_req); 8065bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg mutex_unlock(&local->scan_mtx); 8075bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 80815db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg if (abortscan) 8095bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg ieee80211_scan_completed(&local->hw, true); 8105bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg} 811