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https://git.kernel.org/pub/scm/network/wireless/iwd.git
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station: try multiple roam candidates
This converts station to using ft_action/ft_authenticate and ft_associate and dropping the use of the netdev-only/auth-proto logic. Doing this allows for more flexibility if FT fails by letting IWD try another roam candidate instead of disconnecting.
This commit is contained in:
James Prestwood
Denis Kenzior
parent
ceebf0dc53
commit
0e6aaea2a9
227
src/station.c
227
src/station.c
@ -59,6 +59,7 @@
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#include "src/frame-xchg.h"
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#include "src/sysfs.h"
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#include "src/band.h"
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#include "src/ft.h"
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static struct l_queue *station_list;
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static uint32_t netdev_watch;
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@ -115,6 +116,8 @@ struct station {
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uint32_t wiphy_watch;
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struct wiphy_radio_work_item ft_work;
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bool preparing_roam : 1;
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bool roam_scan_full : 1;
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bool signal_low : 1;
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@ -1676,6 +1679,8 @@ static void station_roam_state_clear(struct station *station)
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}
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l_queue_clear(station->roam_bss_list, l_free);
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ft_clear_authentications(netdev_get_ifindex(station->netdev));
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}
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static void station_reset_connection_state(struct station *station)
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@ -1987,7 +1992,8 @@ static void station_ft_ds_action_start(struct station *station)
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* Fire and forget. Netdev will maintain a cache of responses
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* and when the time comes these can be referenced for a roam
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*/
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netdev_fast_transition_over_ds_action(station->netdev, bss);
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ft_action(netdev_get_ifindex(station->netdev),
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station->connected_bss->frequency, bss);
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}
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}
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@ -2116,42 +2122,26 @@ static void station_reassociate_cb(struct netdev *netdev,
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station_roam_failed(station);
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}
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static void station_fast_transition_cb(struct netdev *netdev,
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enum netdev_result result,
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void *event_data,
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void *user_data)
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{
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struct station *station = user_data;
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l_debug("%u, result: %d", netdev_get_ifindex(station->netdev), result);
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if (station->state != STATION_STATE_ROAMING)
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return;
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if (result == NETDEV_RESULT_OK)
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station_roamed(station);
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else
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station_roam_failed(station);
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}
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static void station_netdev_event(struct netdev *netdev, enum netdev_event event,
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void *event_data, void *user_data);
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static void station_transition_reassociate(struct station *station,
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static int station_transition_reassociate(struct station *station,
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struct scan_bss *bss,
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struct handshake_state *new_hs)
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{
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if (netdev_reassociate(station->netdev, bss, station->connected_bss,
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int ret;
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ret = netdev_reassociate(station->netdev, bss, station->connected_bss,
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new_hs, station_netdev_event,
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station_reassociate_cb, station) < 0) {
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handshake_state_free(new_hs);
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station_roam_failed(station);
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return;
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}
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station_reassociate_cb, station);
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if (ret < 0)
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return ret;
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station->connected_bss = bss;
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station->preparing_roam = false;
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station_enter_state(station, STATION_STATE_ROAMING);
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return 0;
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}
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static bool bss_match_bssid(const void *a, const void *b)
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@ -2223,19 +2213,107 @@ static void station_preauthenticate_cb(struct netdev *netdev,
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handshake_state_set_supplicant_ie(new_hs, rsne_buf);
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}
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station_transition_reassociate(station, bss, new_hs);
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if (station_transition_reassociate(station, bss, new_hs) < 0) {
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handshake_state_free(new_hs);
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station_roam_failed(station);
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}
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}
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static void station_transition_start(struct station *station)
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static void station_transition_start(struct station *station);
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static bool station_ft_work_ready(struct wiphy_radio_work_item *item)
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{
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struct station *station = l_container_of(item, struct station, ft_work);
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struct roam_bss *rbss = l_queue_pop_head(station->roam_bss_list);
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struct scan_bss *bss = network_bss_find_by_addr(
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station->connected_network, rbss->addr);
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int ret;
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l_free(rbss);
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/* Very unlikely, but the BSS could have gone away */
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if (!bss)
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goto try_next;
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ret = ft_associate(netdev_get_ifindex(station->netdev), bss->addr);
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if (ret == -ENOENT) {
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try_next:
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station_transition_start(station);
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return true;
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} else if (ret < 0)
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goto assoc_failed;
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station->connected_bss = bss;
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station->preparing_roam = false;
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station_enter_state(station, STATION_STATE_ROAMING);
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return true;
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assoc_failed:
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station_roam_failed(station);
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return true;
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}
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static const struct wiphy_radio_work_item_ops ft_work_ops = {
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.do_work = station_ft_work_ready,
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};
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static bool station_fast_transition(struct station *station,
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struct scan_bss *bss)
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{
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struct handshake_state *hs = netdev_get_handshake(station->netdev);
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struct network *connected = station->connected_network;
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const struct network_info *info = network_get_info(connected);
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const struct iovec *vendor_ies;
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size_t iov_elems = 0;
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int ret;
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/* Rebuild handshake RSN for target AP */
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if (station_build_handshake_rsn(hs, station->wiphy,
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station->connected_network, bss) < 0)
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return false;
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/* Reset the vendor_ies in case they're different */
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vendor_ies = network_info_get_extra_ies(info, bss, &iov_elems);
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handshake_state_set_vendor_ies(hs, vendor_ies, iov_elems);
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if ((hs->mde[4] & 1)) {
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ret = ft_associate(netdev_get_ifindex(station->netdev),
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bss->addr);
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/* No action responses from this BSS, try over air */
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if (ret == -ENOENT)
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goto try_over_air;
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else if (ret < 0)
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return false;
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station->connected_bss = bss;
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station->preparing_roam = false;
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station_enter_state(station, STATION_STATE_ROAMING);
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return true;
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} else {
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try_over_air:
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/*
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* Send FT-Authenticate and insert a work item which will be
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* gated until authentication completes
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*/
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ft_authenticate(netdev_get_ifindex(station->netdev), bss);
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wiphy_radio_work_insert(station->wiphy, &station->ft_work,
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WIPHY_WORK_PRIORITY_CONNECT, &ft_work_ops);
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return true;
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}
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}
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static bool station_try_next_transition(struct station *station,
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struct scan_bss *bss)
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{
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struct handshake_state *hs = netdev_get_handshake(station->netdev);
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struct network *connected = station->connected_network;
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enum security security = network_get_security(connected);
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struct handshake_state *new_hs;
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struct ie_rsn_info cur_rsne, target_rsne;
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int ret;
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struct roam_bss *rbss = l_queue_peek_head(station->roam_bss_list);
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struct scan_bss *bss = network_bss_find_by_addr(connected, rbss->addr);
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l_debug("%u, target %s", netdev_get_ifindex(station->netdev),
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util_address_to_string(bss->addr));
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@ -2244,54 +2322,8 @@ static void station_transition_start(struct station *station)
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station->ap_directed_roaming = false;
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/* Can we use Fast Transition? */
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if (station_can_fast_transition(hs, bss)) {
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const struct network_info *info = network_get_info(connected);
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const struct iovec *vendor_ies;
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size_t iov_elems = 0;
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/* Rebuild handshake RSN for target AP */
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if (station_build_handshake_rsn(hs, station->wiphy,
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station->connected_network, bss) < 0) {
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l_error("rebuilding handshake rsne failed");
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station_roam_failed(station);
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return;
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}
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/* Reset the vendor_ies in case they're different */
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vendor_ies = network_info_get_extra_ies(info, bss, &iov_elems);
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handshake_state_set_vendor_ies(hs, vendor_ies, iov_elems);
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if ((hs->mde[4] & 1)) {
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ret = netdev_fast_transition_over_ds(station->netdev,
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bss, station->connected_bss,
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station_fast_transition_cb);
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/* No action responses from this BSS, try over air */
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if (ret == -ENOENT)
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goto try_over_air;
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else if (ret < 0) {
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/*
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* If we are here FT-over-air will not work
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* either (identical checks) so try again later.
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*/
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station_roam_retry(station);
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return;
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}
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} else {
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try_over_air:
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if (netdev_fast_transition(station->netdev, bss,
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station->connected_bss,
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station_fast_transition_cb) < 0) {
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station_roam_failed(station);
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return;
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}
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}
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station->connected_bss = bss;
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station->preparing_roam = false;
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station_enter_state(station, STATION_STATE_ROAMING);
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return;
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}
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if (station_can_fast_transition(hs, bss))
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return station_fast_transition(station, bss);
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/* Non-FT transition */
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@ -2321,17 +2353,46 @@ try_over_air:
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if (netdev_preauthenticate(station->netdev, bss,
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station_preauthenticate_cb,
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station) >= 0)
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return;
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return true;
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}
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new_hs = station_handshake_setup(station, connected, bss);
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if (!new_hs) {
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l_error("station_handshake_setup failed in reassociation");
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station_roam_failed(station);
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return;
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return false;
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}
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station_transition_reassociate(station, bss, new_hs);
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if (station_transition_reassociate(station, bss, new_hs) < 0) {
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handshake_state_free(new_hs);
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return false;
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}
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return true;
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}
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static void station_transition_start(struct station *station)
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{
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struct roam_bss *rbss;
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bool roaming = false;
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/*
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* For each failed attempt pop the BSS leaving the head of the queue
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* with the current roam candidate.
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*/
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while ((rbss = l_queue_peek_head(station->roam_bss_list))) {
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struct scan_bss *bss = network_bss_find_by_addr(
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station->connected_network, rbss->addr);
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roaming = station_try_next_transition(station, bss);
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if (roaming)
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break;
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l_queue_pop_head(station->roam_bss_list);
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l_free(rbss);
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}
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if (!roaming)
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station_roam_failed(station);
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}
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static void station_roam_scan_triggered(int err, void *user_data)
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