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https://git.kernel.org/pub/scm/network/wireless/iwd.git
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device: Add support for AP directed roaming
This patch adds a watcher/parser for the frame event associated with an AP directed BSS transition (AP roaming). When the AP sends a BSS transition request, this will parse out the BSS candidate list (neighbor report) and initiate a roam scan. After this point the existing roaming code path is reused.
This commit is contained in:
James Prestwood
Denis Kenzior
parent
6a9de526a8
commit
38e9a67da8
148
src/device.c
148
src/device.c
@ -2,7 +2,7 @@
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2013-2016 Intel Corporation. All rights reserved.
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* Copyright (C) 2013-2018 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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@ -90,6 +90,9 @@ struct device {
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bool preparing_roam : 1;
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bool signal_low : 1;
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bool roam_no_orig_ap : 1;
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bool ap_directed_roaming : 1;
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uint32_t ap_roam_watch;
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};
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struct signal_agent {
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@ -763,6 +766,7 @@ static void device_roam_failed(struct device *device)
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device->preparing_roam = false;
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device->roam_no_orig_ap = false;
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device->ap_directed_roaming = false;
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if (device->state == DEVICE_STATE_ROAMING)
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device_disassociated(device);
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@ -921,6 +925,9 @@ static void device_transition_start(struct device *device, struct scan_bss *bss)
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l_debug("%d, target %s", device->index,
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util_address_to_string(bss->addr));
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/* Reset AP roam flag, at this point the roaming behaves the same */
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device->ap_directed_roaming = false;
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if (hs->mde)
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ie_parse_mobility_domain_from_data(hs->mde, hs->mde[1] + 2,
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&mdid, NULL, NULL);
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@ -1054,6 +1061,11 @@ static bool device_roam_scan_notify(uint32_t wiphy_id, uint32_t ifindex,
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struct ie_rsn_info info;
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int r;
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/* Skip the BSS we are connected to if doing an AP roam */
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if (device->ap_directed_roaming && !memcmp(bss->addr,
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device->connected_bss->addr, 6))
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goto next;
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/* Skip result if it is not part of the ESS */
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if (bss->ssid_len != hs->ssid_len ||
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@ -1153,6 +1165,29 @@ static void device_roam_scan(struct device *device,
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device_roam_failed(device);
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}
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static uint32_t device_freq_from_neighbor_report(const uint8_t *country,
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struct ie_neighbor_report_info *info)
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{
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enum scan_band band;
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uint32_t freq;
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band = scan_oper_class_to_band(country, info->oper_class);
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if (!band) {
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l_debug("Ignored: unsupported oper class");
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return 0;
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}
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freq = scan_channel_to_freq(info->channel_num, band);
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if (!freq) {
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l_debug("Ignored: unsupported channel");
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return 0;
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}
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return freq;
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}
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static void device_neighbor_report_cb(struct netdev *netdev, int err,
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const uint8_t *reports,
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size_t reports_len, void *user_data)
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@ -1186,7 +1221,6 @@ static void device_neighbor_report_cb(struct netdev *netdev, int err,
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/* First see if any of the reports contain the MD bit set */
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while (ie_tlv_iter_next(&iter)) {
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struct ie_neighbor_report_info info;
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enum scan_band band;
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uint32_t freq;
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const uint8_t *cc = NULL;
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@ -1205,19 +1239,9 @@ static void device_neighbor_report_cb(struct netdev *netdev, int err,
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if (device->connected_bss->cc_present)
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cc = device->connected_bss->cc;
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band = scan_oper_class_to_band(cc, info.oper_class);
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if (!band) {
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l_debug("Ignored: unsupported oper class");
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freq = device_freq_from_neighbor_report(cc, &info);
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if (!freq)
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continue;
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}
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freq = scan_channel_to_freq(info.channel_num, band);
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if (!freq) {
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l_debug("Ignored: unsupported channel");
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continue;
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}
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if (!memcmp(info.addr, device->connected_bss->addr, ETH_ALEN)) {
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/*
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@ -1333,6 +1357,91 @@ static void device_roam_timeout_rearm(struct device *device, int seconds)
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l_timeout_create(seconds, device_roam_trigger_cb, device, NULL);
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}
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#define AP_ROAM_BSS_LIST_BIT (1 << 0)
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#define AP_ROAM_BSS_TERMINATION_BIT (1 << 3)
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#define AP_ROAM_ESS_DISSASSOCIATION_IMMINENT (1 << 4)
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static void device_ap_roam_frame_event(struct netdev *netdev,
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const struct mmpdu_header *hdr,
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const void *body, size_t body_len,
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void *user_data)
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{
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struct device *device = user_data;
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uint32_t pos = 0;
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uint8_t req_mode;
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uint16_t dtimer;
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uint8_t valid_interval;
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if (device->preparing_roam || device->state == DEVICE_STATE_ROAMING)
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return;
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if (body_len < 7)
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goto format_error;
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/*
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* First two bytes are checked by the frame watch (WNM category and
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* WNM action). The third is the dialog token which is not relevant
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* because we did not send a BSS transition query -- so skip these
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* first three bytes.
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*/
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pos += 3;
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req_mode = l_get_u8(body + pos);
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pos++;
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/*
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* TODO: Disassociation timer and validity interval are currently not
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* used since the BSS transition request is being handled immediately.
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*/
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dtimer = l_get_le16(body + pos);
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pos += 2;
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valid_interval = l_get_u8(body + pos);
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pos++;
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l_debug("BSS transition received from AP: Disassociation Time: %u, "
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"Validity interval: %u", dtimer, valid_interval);
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/* check req_mode for optional values */
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if (req_mode & AP_ROAM_BSS_TERMINATION_BIT) {
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if (pos + 12 > body_len)
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goto format_error;
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pos += 12;
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}
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if (req_mode & AP_ROAM_ESS_DISSASSOCIATION_IMMINENT) {
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uint8_t url_len;
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if (pos + 1 > body_len)
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goto format_error;
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url_len = l_get_u8(body + pos);
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pos++;
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if (pos + url_len > body_len)
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goto format_error;
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pos += url_len;
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}
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device->ap_directed_roaming = true;
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device->preparing_roam = true;
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l_timeout_remove(device->roam_trigger_timeout);
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device->roam_trigger_timeout = NULL;
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if (req_mode & AP_ROAM_BSS_LIST_BIT)
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device_neighbor_report_cb(device->netdev, 0, body + pos,
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body_len - pos, device);
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else
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device_roam_scan(device, NULL);
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return;
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format_error:
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l_debug("bad AP roam frame formatting");
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}
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static void device_lost_beacon(struct device *device)
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{
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l_debug("%d", device->index);
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@ -2216,6 +2325,7 @@ struct device *device_create(struct wiphy *wiphy, struct netdev *netdev)
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struct device *device;
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struct l_dbus *dbus = dbus_get_bus();
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uint32_t ifindex = netdev_get_ifindex(netdev);
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const uint8_t action_ap_roam_prefix[2] = { 0x0a, 0x07 };
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device = l_new(struct device, 1);
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device->bss_list = l_queue_new();
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@ -2252,6 +2362,13 @@ struct device *device_create(struct wiphy *wiphy, struct netdev *netdev)
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device->netdev_watch_id =
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netdev_watch_add(netdev, device_netdev_notify, device);
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/*
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* register for AP roam transition watch
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*/
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device->ap_roam_watch = netdev_frame_watch_add(netdev, 0x00d0,
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action_ap_roam_prefix, sizeof(action_ap_roam_prefix),
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device_ap_roam_frame_event, device);
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return device;
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}
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@ -2297,6 +2414,9 @@ static void device_free(void *user)
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l_timeout_remove(device->roam_trigger_timeout);
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scan_ifindex_remove(device->index);
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netdev_frame_watch_remove(device->netdev, device->ap_roam_watch);
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l_free(device);
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}
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