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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/nl80211.h>
#include "device-util.h"
#include "networkd-manager.h"
#include "networkd-wiphy.h"
#include "parse-util.h"
#include "wifi-util.h"
Wiphy *wiphy_free(Wiphy *w) {
if (!w)
return NULL;
if (w->manager) {
hashmap_remove_value(w->manager->wiphy_by_index, UINT32_TO_PTR(w->index), w);
if (w->name)
hashmap_remove_value(w->manager->wiphy_by_name, w->name, w);
}
free(w->name);
return mfree(w);
}
static int wiphy_new(Manager *manager, sd_netlink_message *message, Wiphy **ret) {
_cleanup_(wiphy_freep) Wiphy *w = NULL;
_cleanup_free_ char *name = NULL;
uint32_t index;
int r;
assert(manager);
assert(message);
r = sd_netlink_message_read_u32(message, NL80211_ATTR_WIPHY, &index);
if (r < 0)
return r;
r = sd_netlink_message_read_string_strdup(message, NL80211_ATTR_WIPHY_NAME, &name);
if (r < 0)
return r;
w = new(Wiphy, 1);
if (!w)
return -ENOMEM;
*w = (Wiphy) {
.manager = manager,
.index = index,
.name = TAKE_PTR(name),
};
r = hashmap_ensure_put(&manager->wiphy_by_index, NULL, UINT32_TO_PTR(w->index), w);
if (r < 0)
return r;
r = hashmap_ensure_put(&w->manager->wiphy_by_name, &string_hash_ops, w->name, w);
if (r < 0)
return r;
log_wiphy_debug(w, "Saved new wiphy: index=%"PRIu32, w->index);
if (ret)
*ret = w;
TAKE_PTR(w);
return 0;
}
int wiphy_get_by_index(Manager *manager, uint32_t index, Wiphy **ret) {
Wiphy *w;
assert(manager);
w = hashmap_get(manager->wiphy_by_index, UINT32_TO_PTR(index));
if (!w)
return -ENODEV;
if (ret)
*ret = w;
return 0;
}
int wiphy_get_by_name(Manager *manager, const char *name, Wiphy **ret) {
Wiphy *w;
assert(manager);
assert(name);
w = hashmap_get(manager->wiphy_by_name, name);
if (!w)
return -ENODEV;
if (ret)
*ret = w;
return 0;
}
static int wiphy_update_name(Wiphy *w, sd_netlink_message *message) {
const char *name;
int r;
assert(w);
assert(w->manager);
assert(message);
r = sd_netlink_message_read_string(message, NL80211_ATTR_WIPHY_NAME, &name);
if (r == -ENODATA)
return 0;
if (r < 0)
return r;
if (streq(w->name, name))
return 0;
log_wiphy_debug(w, "Wiphy name change detected, renamed to %s.", name);
hashmap_remove_value(w->manager->wiphy_by_name, w->name, w);
r = free_and_strdup(&w->name, name);
if (r < 0)
return r;
r = hashmap_ensure_put(&w->manager->wiphy_by_name, &string_hash_ops, w->name, w);
if (r < 0)
return r;
return 1; /* updated */
}
int manager_genl_process_nl80211_wiphy(sd_netlink *genl, sd_netlink_message *message, Manager *manager) {
const char *family;
uint32_t index;
uint8_t cmd;
Wiphy *w = NULL;
int r;
assert(genl);
assert(message);
assert(manager);
if (sd_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_message_warning_errno(message, r, "nl80211: received error message, ignoring");
return 0;
}
r = sd_genl_message_get_family_name(genl, message, &family);
if (r < 0) {
log_debug_errno(r, "nl80211: failed to determine genl family, ignoring: %m");
return 0;
}
if (!streq(family, NL80211_GENL_NAME)) {
log_debug("nl80211: Received message of unexpected genl family '%s', ignoring.", family);
return 0;
}
r = sd_genl_message_get_command(genl, message, &cmd);
if (r < 0) {
log_debug_errno(r, "nl80211: failed to determine genl message command, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_u32(message, NL80211_ATTR_WIPHY, &index);
if (r < 0) {
log_debug_errno(r, "nl80211: received %s(%u) message without valid index, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
(void) wiphy_get_by_index(manager, index, &w);
switch (cmd) {
case NL80211_CMD_NEW_WIPHY: {
if (!w) {
r = wiphy_new(manager, message, &w);
if (r < 0) {
log_warning_errno(r, "Failed to save new wiphy, ignoring: %m");
return 0;
}
} else {
r = wiphy_update_name(w, message);
if (r < 0) {
log_wiphy_warning_errno(w, r, "Failed to update wiphy name, ignoring: %m");
return 0;
}
if (r == 0)
return 0;
}
break;
}
case NL80211_CMD_DEL_WIPHY:
if (!w) {
log_debug("The kernel removes wiphy we do not know, ignoring: %m");
return 0;
}
log_wiphy_debug(w, "Removed.");
wiphy_free(w);
break;
default:
log_wiphy_debug(w, "nl80211: received %s(%u) message.",
strna(nl80211_cmd_to_string(cmd)), cmd);
}
return 0;
}
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