474 lines
12 KiB
C
474 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* MLO link handling
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*
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* Copyright (C) 2022 Intel Corporation
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*/
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "key.h"
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void ieee80211_link_setup(struct ieee80211_link_data *link)
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{
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if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
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ieee80211_mgd_setup_link(link);
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}
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void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
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int link_id,
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struct ieee80211_link_data *link,
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struct ieee80211_bss_conf *link_conf)
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{
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bool deflink = link_id < 0;
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if (link_id < 0)
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link_id = 0;
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rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
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rcu_assign_pointer(sdata->link[link_id], link);
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link->sdata = sdata;
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link->link_id = link_id;
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link->conf = link_conf;
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link_conf->link_id = link_id;
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INIT_WORK(&link->csa_finalize_work,
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ieee80211_csa_finalize_work);
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INIT_WORK(&link->color_change_finalize_work,
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ieee80211_color_change_finalize_work);
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INIT_LIST_HEAD(&link->assigned_chanctx_list);
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INIT_LIST_HEAD(&link->reserved_chanctx_list);
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INIT_DELAYED_WORK(&link->dfs_cac_timer_work,
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ieee80211_dfs_cac_timer_work);
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if (!deflink) {
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP:
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ether_addr_copy(link_conf->addr,
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sdata->wdev.links[link_id].addr);
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link_conf->bssid = link_conf->addr;
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WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
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break;
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case NL80211_IFTYPE_STATION:
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/* station sets the bssid in ieee80211_mgd_setup_link */
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break;
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default:
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WARN_ON(1);
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}
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}
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}
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void ieee80211_link_stop(struct ieee80211_link_data *link)
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{
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if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
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ieee80211_mgd_stop_link(link);
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ieee80211_link_release_channel(link);
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}
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struct link_container {
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struct ieee80211_link_data data;
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struct ieee80211_bss_conf conf;
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};
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static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
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struct link_container **links, u16 mask)
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{
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struct ieee80211_link_data *link;
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LIST_HEAD(keys);
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unsigned int link_id;
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for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
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if (!(mask & BIT(link_id)))
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continue;
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link = &links[link_id]->data;
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if (link_id == 0 && !link)
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link = &sdata->deflink;
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if (WARN_ON(!link))
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continue;
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ieee80211_remove_link_keys(link, &keys);
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ieee80211_link_stop(link);
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}
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synchronize_rcu();
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ieee80211_free_key_list(sdata->local, &keys);
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}
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static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
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struct link_container **links)
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{
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unsigned int link_id;
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for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
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kfree(links[link_id]);
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}
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static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
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{
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unsigned int i, j;
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for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
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struct ieee80211_link_data *link1;
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link1 = sdata_dereference(sdata->link[i], sdata);
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if (!link1)
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continue;
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for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
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struct ieee80211_link_data *link2;
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link2 = sdata_dereference(sdata->link[j], sdata);
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if (!link2)
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continue;
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if (ether_addr_equal(link1->conf->addr,
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link2->conf->addr))
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return -EALREADY;
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}
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}
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return 0;
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}
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static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
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u16 links)
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{
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sdata->vif.valid_links = links;
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if (!links) {
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sdata->vif.active_links = 0;
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return;
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}
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP:
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/* in an AP all links are always active */
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sdata->vif.active_links = links;
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break;
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case NL80211_IFTYPE_STATION:
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if (sdata->vif.active_links)
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break;
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WARN_ON(hweight16(links) > 1);
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sdata->vif.active_links = links;
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break;
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default:
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WARN_ON(1);
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}
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}
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static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
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struct link_container **to_free,
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u16 new_links)
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{
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u16 old_links = sdata->vif.valid_links;
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u16 old_active = sdata->vif.active_links;
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unsigned long add = new_links & ~old_links;
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unsigned long rem = old_links & ~new_links;
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unsigned int link_id;
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int ret;
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struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
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struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
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struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
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bool use_deflink = old_links == 0; /* set for error case */
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sdata_assert_lock(sdata);
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memset(to_free, 0, sizeof(links));
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if (old_links == new_links)
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return 0;
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/* if there were no old links, need to clear the pointers to deflink */
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if (!old_links)
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rem |= BIT(0);
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/* allocate new link structures first */
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for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
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link = kzalloc(sizeof(*link), GFP_KERNEL);
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if (!link) {
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ret = -ENOMEM;
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goto free;
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}
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links[link_id] = link;
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}
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/* keep track of the old pointers for the driver */
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BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
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memcpy(old, sdata->vif.link_conf, sizeof(old));
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/* and for us in error cases */
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BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
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memcpy(old_data, sdata->link, sizeof(old_data));
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/* grab old links to free later */
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for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
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if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
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/*
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* we must have allocated the data through this path so
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* we know we can free both at the same time
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*/
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to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
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typeof(*links[link_id]),
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data);
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}
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RCU_INIT_POINTER(sdata->link[link_id], NULL);
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RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
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}
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/* link them into data structures */
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for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
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WARN_ON(!use_deflink &&
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rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
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link = links[link_id];
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ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
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ieee80211_link_setup(&link->data);
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}
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if (new_links == 0)
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ieee80211_link_init(sdata, -1, &sdata->deflink,
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&sdata->vif.bss_conf);
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ret = ieee80211_check_dup_link_addrs(sdata);
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if (!ret) {
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/* for keys we will not be able to undo this */
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ieee80211_tear_down_links(sdata, to_free, rem);
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ieee80211_set_vif_links_bitmaps(sdata, new_links);
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/* tell the driver */
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ret = drv_change_vif_links(sdata->local, sdata,
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old_links & old_active,
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new_links & sdata->vif.active_links,
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old);
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}
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if (ret) {
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/* restore config */
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memcpy(sdata->link, old_data, sizeof(old_data));
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memcpy(sdata->vif.link_conf, old, sizeof(old));
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ieee80211_set_vif_links_bitmaps(sdata, old_links);
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/* and free (only) the newly allocated links */
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memset(to_free, 0, sizeof(links));
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goto free;
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}
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/* use deflink/bss_conf again if and only if there are no more links */
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use_deflink = new_links == 0;
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goto deinit;
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free:
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/* if we failed during allocation, only free all */
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for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
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kfree(links[link_id]);
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links[link_id] = NULL;
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}
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deinit:
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if (use_deflink)
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ieee80211_link_init(sdata, -1, &sdata->deflink,
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&sdata->vif.bss_conf);
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return ret;
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}
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int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
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u16 new_links)
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{
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struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
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int ret;
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ret = ieee80211_vif_update_links(sdata, links, new_links);
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ieee80211_free_links(sdata, links);
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return ret;
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}
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void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata)
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{
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struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
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/*
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* The locking here is different because when we free links
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* in the station case we need to be able to cancel_work_sync()
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* something that also takes the lock.
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*/
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sdata_lock(sdata);
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ieee80211_vif_update_links(sdata, links, 0);
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sdata_unlock(sdata);
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ieee80211_free_links(sdata, links);
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}
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static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
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u16 active_links)
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{
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struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS];
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struct ieee80211_local *local = sdata->local;
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u16 old_active = sdata->vif.active_links;
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unsigned long rem = old_active & ~active_links;
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unsigned long add = active_links & ~old_active;
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struct sta_info *sta;
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unsigned int link_id;
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int ret, i;
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if (!ieee80211_sdata_running(sdata))
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return -ENETDOWN;
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if (sdata->vif.type != NL80211_IFTYPE_STATION)
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return -EINVAL;
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/* cannot activate links that don't exist */
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if (active_links & ~sdata->vif.valid_links)
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return -EINVAL;
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/* nothing to do */
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if (old_active == active_links)
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return 0;
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for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
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link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
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sdata);
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if (add) {
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sdata->vif.active_links |= active_links;
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ret = drv_change_vif_links(local, sdata,
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old_active,
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sdata->vif.active_links,
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link_confs);
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if (ret) {
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sdata->vif.active_links = old_active;
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return ret;
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}
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}
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for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
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struct ieee80211_link_data *link;
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link = sdata_dereference(sdata->link[link_id], sdata);
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/* FIXME: kill TDLS connections on the link */
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ieee80211_link_release_channel(link);
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}
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list_for_each_entry(sta, &local->sta_list, list) {
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if (sdata != sta->sdata)
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continue;
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ret = drv_change_sta_links(local, sdata, &sta->sta,
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old_active,
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old_active | active_links);
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WARN_ON_ONCE(ret);
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}
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ret = ieee80211_key_switch_links(sdata, rem, add);
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WARN_ON_ONCE(ret);
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list_for_each_entry(sta, &local->sta_list, list) {
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if (sdata != sta->sdata)
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continue;
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ret = drv_change_sta_links(local, sdata, &sta->sta,
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old_active | active_links,
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active_links);
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WARN_ON_ONCE(ret);
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}
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for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
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struct ieee80211_link_data *link;
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link = sdata_dereference(sdata->link[link_id], sdata);
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ret = ieee80211_link_use_channel(link, &link->conf->chandef,
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IEEE80211_CHANCTX_SHARED);
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WARN_ON_ONCE(ret);
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ieee80211_link_info_change_notify(sdata, link,
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BSS_CHANGED_ERP_CTS_PROT |
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BSS_CHANGED_ERP_PREAMBLE |
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BSS_CHANGED_ERP_SLOT |
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BSS_CHANGED_HT |
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BSS_CHANGED_BASIC_RATES |
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BSS_CHANGED_BSSID |
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BSS_CHANGED_CQM |
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BSS_CHANGED_QOS |
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BSS_CHANGED_TXPOWER |
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BSS_CHANGED_BANDWIDTH |
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BSS_CHANGED_TWT |
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BSS_CHANGED_HE_OBSS_PD |
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BSS_CHANGED_HE_BSS_COLOR);
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ieee80211_mgd_set_link_qos_params(link);
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}
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old_active = sdata->vif.active_links;
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sdata->vif.active_links = active_links;
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if (rem) {
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ret = drv_change_vif_links(local, sdata, old_active,
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active_links, link_confs);
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WARN_ON_ONCE(ret);
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}
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return 0;
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}
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int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
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{
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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struct ieee80211_local *local = sdata->local;
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u16 old_active;
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int ret;
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sdata_lock(sdata);
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mutex_lock(&local->sta_mtx);
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mutex_lock(&local->mtx);
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mutex_lock(&local->key_mtx);
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old_active = sdata->vif.active_links;
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if (old_active & active_links) {
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/*
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* if there's at least one link that stays active across
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* the change then switch to it (to those) first, and
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* then enable the additional links
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*/
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ret = _ieee80211_set_active_links(sdata,
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old_active & active_links);
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if (!ret)
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ret = _ieee80211_set_active_links(sdata, active_links);
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} else {
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/* otherwise switch directly */
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ret = _ieee80211_set_active_links(sdata, active_links);
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}
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mutex_unlock(&local->key_mtx);
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mutex_unlock(&local->mtx);
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mutex_unlock(&local->sta_mtx);
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sdata_unlock(sdata);
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return ret;
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}
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EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
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void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
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u16 active_links)
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{
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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if (!ieee80211_sdata_running(sdata))
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return;
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if (sdata->vif.type != NL80211_IFTYPE_STATION)
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return;
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/* cannot activate links that don't exist */
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if (active_links & ~sdata->vif.valid_links)
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return;
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/* nothing to do */
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if (sdata->vif.active_links == active_links)
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return;
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sdata->desired_active_links = active_links;
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schedule_work(&sdata->activate_links_work);
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}
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EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);
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