scan.c revision a80f7c0b088187c8471b441d461e937991870661
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 */ 15047846c9b0c10808d9337d2e7d09361f3e0a0a71aJohannes Berg if (memcmp(mgmt->da, sdata->vif.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; 2307c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan 2317c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan local->scan_ps_enabled = false; 2329050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2339050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo /* FIXME: what to do when local->pspolling is true? */ 2349050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2359050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo del_timer_sync(&local->dynamic_ps_timer); 2369050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo cancel_work_sync(&local->dynamic_ps_enable_work); 2379050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2389050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2397c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan local->scan_ps_enabled = true; 2409050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2419050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2429050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo } 2439050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2447c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan if (!(local->scan_ps_enabled) || 2457c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) 2469050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo /* 2479050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * If power save was enabled, no need to send a nullfunc 2489050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * frame because AP knows that we are sleeping. But if the 2499050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * hardware is creating the nullfunc frame for power save 2509050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not 2519050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * enabled) and power save was enabled, the firmware just 2529050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * sent a null frame with power save disabled. So we need 2539050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * to send a new nullfunc frame to inform the AP that we 2549050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * are again sleeping. 2559050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo */ 2569050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_send_nullfunc(local, sdata, 1); 2579050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo} 2589050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2599050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo/* inform AP that we are awake again, unless power save is enabled */ 2609050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valostatic void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata) 2619050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo{ 2629050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo struct ieee80211_local *local = sdata->local; 2639050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 264965bedadc01d34027455d5d5b67063ef0209c955Johannes Berg if (!local->ps_sdata) 2659050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_send_nullfunc(local, sdata, 0); 2667c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan else if (local->scan_ps_enabled) { 2679050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo /* 2689050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware 2699050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * will send a nullfunc frame with the powersave bit set 2709050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * even though the AP already knows that we are sleeping. 2719050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * This could be avoided by sending a null frame with power 2729050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * save bit disabled before enabling the power save, but 2739050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * this doesn't gain anything. 2749050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * 2759050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need 2769050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * to send a nullfunc frame because AP already knows that 2779050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * we are sleeping, let's just enable power save mode in 2789050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo * hardware. 2799050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo */ 2809050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo local->hw.conf.flags |= IEEE80211_CONF_PS; 2819050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2827c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan } else if (local->hw.conf.dynamic_ps_timeout > 0) { 2837c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan /* 2847c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer 2857c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan * had been running before leaving the operating channel, 2867c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan * restart the timer now and send a nullfunc frame to inform 2877c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan * the AP that we are awake. 2887c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan */ 2897c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan ieee80211_send_nullfunc(local, sdata, 0); 2907c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan mod_timer(&local->dynamic_ps_timer, jiffies + 2917c3f4bbedc241ddcd3abe1f419c356e625231da1Vivek Natarajan msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 2929050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo } 2939050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo} 2949050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo 2952a5193119269062608582418deba7af82844159aJohannes Bergvoid ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) 2960a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 2970a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = hw_to_local(hw); 2980a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_sub_if_data *sdata; 299f3b85252f081581a8f257545ed748062dce7798bJohannes Berg bool was_hw_scan; 3000a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 301f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 3025bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 3036d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg /* 3046d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * It's ok to abort a not-yet-running scan (that 3056d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * we have one at all will be verified by checking 3066d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * local->scan_req next), but not to complete it 3076d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg * successfully. 3086d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg */ 3096d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg if (WARN_ON(!local->scanning && !aborted)) 3106d3560d4fc9c5b9fe1a07a63926ea70512c69c32Johannes Berg aborted = true; 3115bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg 312f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (WARN_ON(!local->scan_req)) { 313f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 314f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 315de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg } 316de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 3174d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); 3184d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { 3194d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ieee80211_queue_delayed_work(&local->hw, 3204d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg &local->scan_work, 0); 3214d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg mutex_unlock(&local->scan_mtx); 3224d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return; 3234d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 3244d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 3254d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 3264d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 327f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 3285ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (local->scan_req != local->int_scan_req) 3292a5193119269062608582418deba7af82844159aJohannes Berg cfg80211_scan_done(local->scan_req, aborted); 3302a5193119269062608582418deba7af82844159aJohannes Berg local->scan_req = NULL; 33115db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 3322a5193119269062608582418deba7af82844159aJohannes Berg 333fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 33458905ca5b11a0ff3860f55b789cbbf052f7158a7Johannes Berg local->scan_channel = NULL; 335f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 336f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* we only have to protect scan_req and hw/sw scan */ 337f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 338f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 339e8975581f63870be42ff4662b293d1b0c8c21350Johannes Berg ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 3405cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg if (was_hw_scan) 3415cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg goto done; 3420a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3433ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 3440a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3452448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_complete(local); 34680e775bf08f1915870fbb0c1c7a45a3fdc291721Michael Buesch 347078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg mutex_lock(&local->iflist_mtx); 348078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg list_for_each_entry(sdata, &local->interfaces, list) { 3499607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 350fb9ddbf086591ab4c90c44d10468f84d465b3fdfJohannes Berg continue; 351fb9ddbf086591ab4c90c44d10468f84d465b3fdfJohannes Berg 3520a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg /* Tell AP we're back */ 35305c914fe330fa8e1cc67870dc0d3809dfd96c107Johannes Berg if (sdata->vif.type == NL80211_IFTYPE_STATION) { 35477fdaa12cea26c204cc12c312fe40bc0f3dcdfd8Johannes Berg if (sdata->u.mgd.associated) { 3559050bdd8589c373e01e41ddbd9a192de2ff01ef0Kalle Valo ieee80211_scan_ps_disable(sdata); 35653623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_wake_queue(sdata->dev); 3570a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg } 3580a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg } else 35953623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_wake_queue(sdata->dev); 360078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg 36114b80724367dfdc86f4807461dd1f7f2dd630416Johannes Berg /* re-enable beaconing */ 36214b80724367dfdc86f4807461dd1f7f2dd630416Johannes Berg if (sdata->vif.type == NL80211_IFTYPE_AP || 36314b80724367dfdc86f4807461dd1f7f2dd630416Johannes Berg sdata->vif.type == NL80211_IFTYPE_ADHOC || 36414b80724367dfdc86f4807461dd1f7f2dd630416Johannes Berg sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 3652d0ddec5b2b859f06116f631fc0ffe94fbceb556Johannes Berg ieee80211_bss_info_change_notify( 3662d0ddec5b2b859f06116f631fc0ffe94fbceb556Johannes Berg sdata, BSS_CHANGED_BEACON_ENABLED); 3670a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg } 368078e1e60dd6c6b0d4bc8d58ccb80c008e8efc9ffJohannes Berg mutex_unlock(&local->iflist_mtx); 3690a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 3700a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg done: 3715cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 3720a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg ieee80211_mlme_notify_scan_completed(local); 373469002983fc90c2ff0959e2b03335c0fe2e4d5a9Johannes Berg ieee80211_ibss_notify_scan_completed(local); 374472dbc45dc1966284de72d7de15690c17ed2cf33Johannes Berg ieee80211_mesh_notify_scan_completed(local); 3750a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 3760a51b27e956bd9580296c48191b78175ed8b5971Johannes BergEXPORT_SYMBOL(ieee80211_scan_completed); 3770a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 378f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int ieee80211_start_sw_scan(struct ieee80211_local *local) 379f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 380f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_sub_if_data *sdata; 381f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 382f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 383f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Hardware/driver doesn't support hw_scan, so use software 384f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * scanning instead. First send a nullfunc frame with power save 385f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * bit on so that AP will buffer the frames for us while we are not 386f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * listening, then send probe requests to each channel and wait for 387f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * the responses. After all channels are scanned, tune back to the 388f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * original channel and send a nullfunc frame with power save bit 389f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * off to trigger the AP to send us all the buffered frames. 390f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 391f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Note that while local->sw_scanning is true everything else but 392f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * nullfunc frames and probe requests will be dropped in 393f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * ieee80211_tx_h_check_assoc(). 394f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 3952448798133d747ad339e57099e32a1d1e68aca1cJohannes Berg drv_sw_scan_start(local); 396f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 397f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->iflist_mtx); 398f3b85252f081581a8f257545ed748062dce7798bJohannes Berg list_for_each_entry(sdata, &local->interfaces, list) { 3999607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 400f3b85252f081581a8f257545ed748062dce7798bJohannes Berg continue; 401f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 402f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* disable beaconing */ 403f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (sdata->vif.type == NL80211_IFTYPE_AP || 404f3b85252f081581a8f257545ed748062dce7798bJohannes Berg sdata->vif.type == NL80211_IFTYPE_ADHOC || 405f3b85252f081581a8f257545ed748062dce7798bJohannes Berg sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 4062d0ddec5b2b859f06116f631fc0ffe94fbceb556Johannes Berg ieee80211_bss_info_change_notify( 4072d0ddec5b2b859f06116f631fc0ffe94fbceb556Johannes Berg sdata, BSS_CHANGED_BEACON_ENABLED); 408f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 409142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 410142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * only handle non-STA interfaces here, STA interfaces 411142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * are handled in the scan state machine 412142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 413142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type != NL80211_IFTYPE_STATION) 41453623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_stop_queue(sdata->dev); 415f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 416f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->iflist_mtx); 417f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 418977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 419f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_channel_idx = 0; 420f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 421a80f7c0b088187c8471b441d461e937991870661Johannes Berg drv_flush(local, false); 422a80f7c0b088187c8471b441d461e937991870661Johannes Berg 4233ac64beecd27400d12cc7afb4108eef26c499f6aJohannes Berg ieee80211_configure_filter(local); 424f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 42542935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, 42642935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez &local->scan_work, 42742935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez IEEE80211_CHANNEL_TIME); 428f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 429f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 430f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 431f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 432f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 433f3b85252f081581a8f257545ed748062dce7798bJohannes Bergstatic int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, 434f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 435f3b85252f081581a8f257545ed748062dce7798bJohannes Berg{ 436f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_local *local = sdata->local; 437f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; 438f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 439f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 440f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 441f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -EBUSY; 442f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 443f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) { 444f3b85252f081581a8f257545ed748062dce7798bJohannes Berg u8 *ies; 445f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4464d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = kmalloc( 4474d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 4484d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]) + 4494d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len + 4504d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->ie_len, GFP_KERNEL); 4514d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (!local->hw_scan_req) 452f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return -ENOMEM; 453f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4544d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ssids = req->ssids; 4554d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->n_ssids = req->n_ssids; 4564d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ies = (u8 *)local->hw_scan_req + 4574d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg sizeof(*local->hw_scan_req) + 4584d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg req->n_channels * sizeof(req->channels[0]); 4594d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req->ie = ies; 4604d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 4614d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_band = 0; 462f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 463f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 464f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = req; 465f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_sdata = sdata; 466f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4675ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg if (req != local->int_scan_req && 468f3b85252f081581a8f257545ed748062dce7798bJohannes Berg sdata->vif.type == NL80211_IFTYPE_STATION && 46977fdaa12cea26c204cc12c312fe40bc0f3dcdfd8Johannes Berg !list_empty(&ifmgd->work_list)) { 47077fdaa12cea26c204cc12c312fe40bc0f3dcdfd8Johannes Berg /* actually wait for the work it's doing to finish/time out */ 471f3b85252f081581a8f257545ed748062dce7798bJohannes Berg set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request); 472f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return 0; 473f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 474f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 475f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->ops->hw_scan) 476fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_HW_SCANNING, &local->scanning); 477f3b85252f081581a8f257545ed748062dce7798bJohannes Berg else 478fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa __set_bit(SCAN_SW_SCANNING, &local->scanning); 479f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* 480f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * Kicking off the scan need not be protected, 481f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * only the scan variable stuff, since now 482f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * local->scan_req is assigned and other callers 483f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * will abort their scan attempts. 484f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * 485f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * This avoids getting a scan_mtx -> iflist_mtx 486f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * dependency, so that the scan completed calls 487f3b85252f081581a8f257545ed748062dce7798bJohannes Berg * have more locking freedom. 488f3b85252f081581a8f257545ed748062dce7798bJohannes Berg */ 4895cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 4905cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 491f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 492f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 4934d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->ops->hw_scan) { 4944d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg WARN_ON(!ieee80211_prep_hw_scan(local)); 4954d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg rc = drv_hw_scan(local, local->hw_scan_req); 4964d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } else 497f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = ieee80211_start_sw_scan(local); 498f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 499f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 500f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 501f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) { 5024d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg kfree(local->hw_scan_req); 5034d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg local->hw_scan_req = NULL; 504fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa local->scanning = 0; 505f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5065cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg ieee80211_recalc_idle(local); 5075cff20e6c5a6591a79d3b027af222870f52bb550Johannes Berg 508f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 509f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_sdata = NULL; 510f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 511f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 512f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return rc; 513f3b85252f081581a8f257545ed748062dce7798bJohannes Berg} 514f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 5152fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic int ieee80211_scan_state_decision(struct ieee80211_local *local, 5162fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 5177d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 518142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa bool associated = false; 519142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 520142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 521142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* if no more bands/channels left, complete scan and advance to the idle state */ 5227d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (local->scan_channel_idx >= local->scan_req->n_channels) { 5237d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa ieee80211_scan_completed(&local->hw, false); 5247d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa return 1; 5257d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 5262fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 527142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* check if at least one STA interface is associated */ 528142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 529142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 5309607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 531142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 532142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 533142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 534142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) { 535142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa associated = true; 536142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 537142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 538142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 539142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 540142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 541142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 542142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (local->scan_channel) { 543142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 544142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * we're currently scanning a different channel, let's 545142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * switch back to the operating channel now if at least 546142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * one interface is associated. Otherwise just scan the 547142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * next channel 548142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 549142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (associated) 550977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; 551142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa else 552977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 553142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } else { 554142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 555142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * we're on the operating channel currently, let's 556142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * leave that channel now to scan another one 557142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 558977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; 559142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 560142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 5612fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa *next_delay = 0; 5622fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return 0; 5632fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa} 5642fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 565142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaastatic void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, 566142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa unsigned long *next_delay) 567142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa{ 568142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata; 569142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 570142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 571142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * notify the AP about us leaving the channel and stop all STA interfaces 572142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 573142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 574142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 5759607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 576142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 577142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 578142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 57953623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_stop_queue(sdata->dev); 580142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) 581142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_ps_enable(sdata); 582142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 583142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 584142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 585142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 586142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa __set_bit(SCAN_OFF_CHANNEL, &local->scanning); 587142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 588a80f7c0b088187c8471b441d461e937991870661Johannes Berg /* 589a80f7c0b088187c8471b441d461e937991870661Johannes Berg * What if the nullfunc frames didn't arrive? 590a80f7c0b088187c8471b441d461e937991870661Johannes Berg */ 591a80f7c0b088187c8471b441d461e937991870661Johannes Berg drv_flush(local, false); 592a80f7c0b088187c8471b441d461e937991870661Johannes Berg if (local->ops->flush) 593a80f7c0b088187c8471b441d461e937991870661Johannes Berg *next_delay = 0; 594a80f7c0b088187c8471b441d461e937991870661Johannes Berg else 595a80f7c0b088187c8471b441d461e937991870661Johannes Berg *next_delay = HZ / 10; 596a80f7c0b088187c8471b441d461e937991870661Johannes Berg 597142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* advance to the next channel to be scanned */ 598977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SET_CHANNEL; 599142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 600142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 601142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaastatic void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, 602142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa unsigned long *next_delay) 603142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa{ 604142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 605142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 606142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* switch back to the operating channel */ 607142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa local->scan_channel = NULL; 608142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 609142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 610142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* 611142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa * notify the AP about us being back and restart all STA interfaces 612142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa */ 613142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_lock(&local->iflist_mtx); 614142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa list_for_each_entry(sdata, &local->interfaces, list) { 6159607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) 616142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa continue; 617142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 618142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa /* Tell AP we're back */ 619142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->vif.type == NL80211_IFTYPE_STATION) { 620142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa if (sdata->u.mgd.associated) 621142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_ps_disable(sdata); 62253623f1a09c7a7d23b74f0f7d93dba0ebde1006bJohn W. Linville netif_wake_queue(sdata->dev); 623142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 624142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa } 625142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa mutex_unlock(&local->iflist_mtx); 626142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 627142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); 628142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 629142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa *next_delay = HZ / 5; 630977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 631142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa} 632142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa 6332fb3f028a9a46bd344329766257699b4acb36525Helmut Schaastatic void ieee80211_scan_state_set_channel(struct ieee80211_local *local, 6342fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa unsigned long *next_delay) 6352fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa{ 6362fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa int skip; 6372fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa struct ieee80211_channel *chan; 6382fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa 6397d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 0; 6407d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa chan = local->scan_req->channels[local->scan_channel_idx]; 6417d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 642584991dccfd347cd2e1675ab262998f6c335d3c0Johannes Berg local->scan_channel = chan; 643584991dccfd347cd2e1675ab262998f6c335d3c0Johannes Berg if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) 6447d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa skip = 1; 6457d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6467d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* advance state machine to next channel/band */ 6477d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_channel_idx++; 6487d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6490ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa if (skip) { 6500ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa /* if we skip this channel return to the decision state */ 6510ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa local->next_scan_state = SCAN_DECISION; 6522fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6530ee9c13c7c92581ab005d80795cf65897213b249Helmut Schaa } 6547d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6557d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6567d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * Probe delay is used to update the NAV, cf. 11.1.3.2.2 6577d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * (which unfortunately doesn't say _why_ step a) is done, 6587d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * but it waits for the probe delay or until a frame is 6597d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received - and the received frame would update the NAV). 6607d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * For now, we do not support waiting until a frame is 6617d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * received. 6627d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * 6637d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * In any case, it is not necessary for a passive scan. 6647d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6657d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || 6667d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa !local->scan_req->n_ssids) { 6677d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; 668977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6692fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa return; 6707d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa } 6717d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6722fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa /* active scan, send probes */ 6737d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_PROBE_DELAY; 674977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_SEND_PROBE; 6757d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6767d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6777d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaastatic void ieee80211_scan_state_send_probe(struct ieee80211_local *local, 6787d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa unsigned long *next_delay) 6797d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa{ 6807d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa int i; 6817d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa struct ieee80211_sub_if_data *sdata = local->scan_sdata; 6827d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6837d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa for (i = 0; i < local->scan_req->n_ssids; i++) 6847d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa ieee80211_send_probe_req( 6857d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa sdata, NULL, 6867d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ssids[i].ssid, 6877d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ssids[i].ssid_len, 6887d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa local->scan_req->ie, local->scan_req->ie_len); 6897d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 6907d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa /* 6917d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * After sending probe requests, wait for probe responses 6927d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa * on the channel. 6937d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa */ 6947d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa *next_delay = IEEE80211_CHANNEL_TIME; 695977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa local->next_scan_state = SCAN_DECISION; 6967d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa} 6977d3be3cc489176bc7bd23e673b0b4aef597af2b3Helmut Schaa 698c2b13452b283f9c4a5b02a6b53ed6416ebf4c03cJohannes Bergvoid ieee80211_scan_work(struct work_struct *work) 6990a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 7000a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = 7010a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg container_of(work, struct ieee80211_local, scan_work.work); 7020a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_sub_if_data *sdata = local->scan_sdata; 7030a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg unsigned long next_delay = 0; 7040a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 705f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 706f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (!sdata || !local->scan_req) { 707f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 708f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 709f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 710f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 7114d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (local->hw_scan_req) { 7124d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg int rc = drv_hw_scan(local, local->hw_scan_req); 7134d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg mutex_unlock(&local->scan_mtx); 7144d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg if (rc) 7154d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg ieee80211_scan_completed(&local->hw, true); 7164d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg return; 7174d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg } 7184d36ec58239eec44d77839ef6c25108efcbbb58cJohannes Berg 719fbe9c429f195111bbf7f1630efa19aee295fd8e7Helmut Schaa if (local->scan_req && !local->scanning) { 720f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req = local->scan_req; 721f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int rc; 722f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 723f3b85252f081581a8f257545ed748062dce7798bJohannes Berg local->scan_req = NULL; 72415db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg local->scan_sdata = NULL; 725f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 726f3b85252f081581a8f257545ed748062dce7798bJohannes Berg rc = __ieee80211_start_scan(sdata, req); 727f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 728f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 729f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (rc) 730f3b85252f081581a8f257545ed748062dce7798bJohannes Berg ieee80211_scan_completed(&local->hw, true); 731f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return; 732f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 733f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 734f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 735f3b85252f081581a8f257545ed748062dce7798bJohannes Berg 7365bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg /* 7375bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg * Avoid re-scheduling when the sdata is going away. 7385bc75728fd43bb15b46f16ef465bcf9d487393cfJohannes Berg */ 7399607e6b66a0d25ca63b70d54a4283fa13d8f7c9dJohannes Berg if (!ieee80211_sdata_running(sdata)) { 740f3b85252f081581a8f257545ed748062dce7798bJohannes Berg ieee80211_scan_completed(&local->hw, true); 7410a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg return; 742f3b85252f081581a8f257545ed748062dce7798bJohannes Berg } 7430a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 744f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa /* 745f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * as long as no delay is required advance immediately 746f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa * without scheduling a new work 747f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa */ 748f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa do { 749977923b00c79185c11b4b47664f5ffa4c3820438Helmut Schaa switch (local->next_scan_state) { 7502fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_DECISION: 7512fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa if (ieee80211_scan_state_decision(local, &next_delay)) 752f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa return; 753f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 7542fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa case SCAN_SET_CHANNEL: 7552fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa ieee80211_scan_state_set_channel(local, &next_delay); 7562fb3f028a9a46bd344329766257699b4acb36525Helmut Schaa break; 757f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa case SCAN_SEND_PROBE: 758f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa ieee80211_scan_state_send_probe(local, &next_delay); 759f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa break; 760142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa case SCAN_LEAVE_OPER_CHANNEL: 761142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_state_leave_oper_channel(local, &next_delay); 762142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 763142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa case SCAN_ENTER_OPER_CHANNEL: 764142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa ieee80211_scan_state_enter_oper_channel(local, &next_delay); 765142b9f5074dc0d09dc0025739ad437723d7bf527Helmut Schaa break; 766f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } 767f502d09b750437a4ec9c63333acf1070fe7958afHelmut Schaa } while (next_delay == 0); 7680a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 76942935ecaf4e784d0815afa9a7e5fe7e141157ca3Luis R. Rodriguez ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); 7700a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7710a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 772f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, 773f3b85252f081581a8f257545ed748062dce7798bJohannes Berg struct cfg80211_scan_request *req) 7740a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 775f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int res; 776de95a54b1aebe5592cae971ca5e5d9ec6a381a17Johannes Berg 777f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&sdata->local->scan_mtx); 778f3b85252f081581a8f257545ed748062dce7798bJohannes Berg res = __ieee80211_start_scan(sdata, req); 779f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&sdata->local->scan_mtx); 7800a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 781f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return res; 7820a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 7830a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 784f3b85252f081581a8f257545ed748062dce7798bJohannes Bergint ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata, 785f3b85252f081581a8f257545ed748062dce7798bJohannes Berg const u8 *ssid, u8 ssid_len) 7860a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg{ 7870a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg struct ieee80211_local *local = sdata->local; 788f3b85252f081581a8f257545ed748062dce7798bJohannes Berg int ret = -EBUSY; 7892a5193119269062608582418deba7af82844159aJohannes Berg 790f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_lock(&local->scan_mtx); 7910a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg 792f3b85252f081581a8f257545ed748062dce7798bJohannes Berg /* busy scanning */ 793f3b85252f081581a8f257545ed748062dce7798bJohannes Berg if (local->scan_req) 794f3b85252f081581a8f257545ed748062dce7798bJohannes Berg goto unlock; 7959116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 7965ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); 7975ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg local->int_scan_req->ssids[0].ssid_len = ssid_len; 7989116dd01120e249dc2e84e6edecd7ad7f828680fJohannes Berg 7995ba63533bbf653631faab60f6988506160ec6ba4Johannes Berg ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); 800f3b85252f081581a8f257545ed748062dce7798bJohannes Berg unlock: 801f3b85252f081581a8f257545ed748062dce7798bJohannes Berg mutex_unlock(&local->scan_mtx); 802f3b85252f081581a8f257545ed748062dce7798bJohannes Berg return ret; 8030a51b27e956bd9580296c48191b78175ed8b5971Johannes Berg} 8045bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 8055bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Bergvoid ieee80211_scan_cancel(struct ieee80211_local *local) 8065bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg{ 80715db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg bool abortscan; 8085bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 8095bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg cancel_delayed_work_sync(&local->scan_work); 8105bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 8115bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg /* 8125bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg * Only call this function when a scan can't be 8135bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg * queued -- mostly at suspend under RTNL. 8145bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg */ 8155bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg mutex_lock(&local->scan_mtx); 81615db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) || 81715db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg (!local->scanning && local->scan_req); 8185bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg mutex_unlock(&local->scan_mtx); 8195bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg 82015db0b7fd872b0312033666d3a82e1214a227ec0Johannes Berg if (abortscan) 8215bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg ieee80211_scan_completed(&local->hw, true); 8225bb644a0fd25a5e083ecbfaa92a211db99aa6ef7Johannes Berg} 823