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synced 2025-10-31 16:54:21 +00:00
wifi: mac80211: move link code to a new file
We probably should've done that originally, we already have about 300 lines of code there, and will add more. Move all the link code we wrote to a new file. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
parent
b1622adaa5
commit
e73b5e51a0
4 changed files with 274 additions and 254 deletions
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@ -16,6 +16,7 @@ mac80211-y := \
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s1g.o \
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ibss.o \
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iface.o \
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link.o \
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rate.o \
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michael.o \
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tkip.o \
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@ -1930,9 +1930,6 @@ void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata);
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int ieee80211_add_virtual_monitor(struct ieee80211_local *local);
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void ieee80211_del_virtual_monitor(struct ieee80211_local *local);
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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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bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata);
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void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
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bool update_bss);
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@ -1943,6 +1940,17 @@ static inline bool ieee80211_sdata_running(struct ieee80211_sub_if_data *sdata)
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return test_bit(SDATA_STATE_RUNNING, &sdata->state);
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}
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/* link handling */
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void ieee80211_link_setup(struct ieee80211_link_data *link);
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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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void ieee80211_link_stop(struct ieee80211_link_data *link);
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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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void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata);
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/* tx handling */
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void ieee80211_clear_tx_pending(struct ieee80211_local *local);
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void ieee80211_tx_pending(struct tasklet_struct *t);
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@ -439,257 +439,6 @@ static int ieee80211_open(struct net_device *dev)
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return err;
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}
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static 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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static 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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static 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_free_links(struct ieee80211_sub_if_data *sdata,
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struct link_container **links)
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{
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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 (!links[link_id])
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continue;
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ieee80211_remove_link_keys(&links[link_id]->data, &keys);
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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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for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
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if (!links[link_id])
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continue;
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ieee80211_link_stop(&links[link_id]->data);
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kfree(links[link_id]);
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}
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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 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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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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sdata->vif.valid_links = new_links;
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ret = ieee80211_check_dup_link_addrs(sdata);
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if (!ret) {
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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, new_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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sdata->vif.valid_links = 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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static 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 void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
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{
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struct ieee80211_local *local = sdata->local;
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262
net/mac80211/link.c
Normal file
262
net/mac80211/link.c
Normal file
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@ -0,0 +1,262 @@
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// 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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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_free_links(struct ieee80211_sub_if_data *sdata,
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struct link_container **links)
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{
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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 (!links[link_id])
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continue;
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ieee80211_remove_link_keys(&links[link_id]->data, &keys);
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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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for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
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if (!links[link_id])
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continue;
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ieee80211_link_stop(&links[link_id]->data);
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kfree(links[link_id]);
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}
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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 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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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 */
|
||||
if (!old_links)
|
||||
rem |= BIT(0);
|
||||
|
||||
/* allocate new link structures first */
|
||||
for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
|
||||
link = kzalloc(sizeof(*link), GFP_KERNEL);
|
||||
if (!link) {
|
||||
ret = -ENOMEM;
|
||||
goto free;
|
||||
}
|
||||
links[link_id] = link;
|
||||
}
|
||||
|
||||
/* keep track of the old pointers for the driver */
|
||||
BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
|
||||
memcpy(old, sdata->vif.link_conf, sizeof(old));
|
||||
/* and for us in error cases */
|
||||
BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
|
||||
memcpy(old_data, sdata->link, sizeof(old_data));
|
||||
|
||||
/* grab old links to free later */
|
||||
for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
|
||||
if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
|
||||
/*
|
||||
* we must have allocated the data through this path so
|
||||
* we know we can free both at the same time
|
||||
*/
|
||||
to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
|
||||
typeof(*links[link_id]),
|
||||
data);
|
||||
}
|
||||
|
||||
RCU_INIT_POINTER(sdata->link[link_id], NULL);
|
||||
RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
|
||||
}
|
||||
|
||||
/* link them into data structures */
|
||||
for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
|
||||
WARN_ON(!use_deflink &&
|
||||
rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
|
||||
|
||||
link = links[link_id];
|
||||
ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
|
||||
ieee80211_link_setup(&link->data);
|
||||
}
|
||||
|
||||
if (new_links == 0)
|
||||
ieee80211_link_init(sdata, -1, &sdata->deflink,
|
||||
&sdata->vif.bss_conf);
|
||||
|
||||
sdata->vif.valid_links = new_links;
|
||||
|
||||
ret = ieee80211_check_dup_link_addrs(sdata);
|
||||
if (!ret) {
|
||||
/* tell the driver */
|
||||
ret = drv_change_vif_links(sdata->local, sdata,
|
||||
old_links, new_links,
|
||||
old);
|
||||
}
|
||||
|
||||
if (ret) {
|
||||
/* restore config */
|
||||
memcpy(sdata->link, old_data, sizeof(old_data));
|
||||
memcpy(sdata->vif.link_conf, old, sizeof(old));
|
||||
sdata->vif.valid_links = old_links;
|
||||
/* and free (only) the newly allocated links */
|
||||
memset(to_free, 0, sizeof(links));
|
||||
goto free;
|
||||
}
|
||||
|
||||
/* use deflink/bss_conf again if and only if there are no more links */
|
||||
use_deflink = new_links == 0;
|
||||
|
||||
goto deinit;
|
||||
free:
|
||||
/* if we failed during allocation, only free all */
|
||||
for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
|
||||
kfree(links[link_id]);
|
||||
links[link_id] = NULL;
|
||||
}
|
||||
deinit:
|
||||
if (use_deflink)
|
||||
ieee80211_link_init(sdata, -1, &sdata->deflink,
|
||||
&sdata->vif.bss_conf);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
|
||||
u16 new_links)
|
||||
{
|
||||
struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
|
||||
int ret;
|
||||
|
||||
ret = ieee80211_vif_update_links(sdata, links, new_links);
|
||||
ieee80211_free_links(sdata, links);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata)
|
||||
{
|
||||
struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
|
||||
|
||||
/*
|
||||
* The locking here is different because when we free links
|
||||
* in the station case we need to be able to cancel_work_sync()
|
||||
* something that also takes the lock.
|
||||
*/
|
||||
|
||||
sdata_lock(sdata);
|
||||
ieee80211_vif_update_links(sdata, links, 0);
|
||||
sdata_unlock(sdata);
|
||||
|
||||
ieee80211_free_links(sdata, links);
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue