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netdev: Make sure set_powered calls are cancelable
Since all netdevs share the rtnl l_netlink object, it was possible for netdevs to be destroyed with outstanding commands still executing on the rtnl object. This can lead to crashes and other nasty situations. This patch makes sure that Powered requests are always tracked via set_powered_cmd_id and the request is canceled when netdev is destroyed. This also implies that netdev_set_powered can now return an -EBUSY error in case a request is already outstanding.
This commit is contained in:
Denis Kenzior
parent
c530667ed1
commit
015e8625bf
134
src/netdev.c
134
src/netdev.c
@ -104,6 +104,11 @@ struct netdev {
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struct l_timeout *rssi_poll_timeout;
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uint32_t rssi_poll_cmd_id;
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uint32_t set_powered_cmd_id;
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netdev_set_powered_cb_t set_powered_cb;
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void *set_powered_user_data;
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netdev_destroy_func_t set_powered_destroy;
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struct watchlist event_watches;
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struct watchlist frame_watches;
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@ -305,45 +310,39 @@ struct handshake_state *netdev_get_handshake(struct netdev *netdev)
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return netdev->handshake;
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}
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struct set_powered_cb_data {
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struct netdev *netdev;
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netdev_set_powered_cb_t callback;
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void *user_data;
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l_netlink_destroy_func_t destroy;
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};
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static void netdev_set_powered_result(int error, uint16_t type,
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const void *data,
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uint32_t len, void *user_data)
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{
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struct set_powered_cb_data *cb_data = user_data;
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struct netdev *netdev = user_data;
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if (!cb_data)
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return;
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if (netdev->set_powered_cb)
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netdev->set_powered_cb(netdev, error,
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netdev->set_powered_user_data);
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cb_data->callback(cb_data->netdev, error, cb_data->user_data);
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netdev->set_powered_cb = NULL;
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}
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static void netdev_set_powered_destroy(void *user_data)
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{
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struct set_powered_cb_data *cb_data = user_data;
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struct netdev *netdev = user_data;
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if (!cb_data)
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return;
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netdev->set_powered_cmd_id = 0;
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if (cb_data->destroy)
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cb_data->destroy(cb_data->user_data);
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if (netdev->set_powered_destroy)
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netdev->set_powered_destroy(netdev->set_powered_user_data);
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l_free(cb_data);
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netdev->set_powered_destroy = NULL;
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netdev->set_powered_user_data = NULL;
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}
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int netdev_set_powered(struct netdev *netdev, bool powered,
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netdev_set_powered_cb_t callback, void *user_data,
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netdev_destroy_func_t destroy)
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static uint32_t rtnl_set_powered(int ifindex, bool powered,
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l_netlink_command_func_t cb, void *user_data,
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l_netlink_destroy_func_t destroy)
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{
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struct ifinfomsg *rtmmsg;
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size_t bufsize;
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struct set_powered_cb_data *cb_data = NULL;
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uint32_t id;
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bufsize = NLMSG_ALIGN(sizeof(struct ifinfomsg));
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@ -351,24 +350,34 @@ int netdev_set_powered(struct netdev *netdev, bool powered,
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memset(rtmmsg, 0, bufsize);
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rtmmsg->ifi_family = AF_UNSPEC;
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rtmmsg->ifi_index = netdev->index;
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rtmmsg->ifi_change = 0xffffffff;
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rtmmsg->ifi_flags = powered ? (netdev->ifi_flags | IFF_UP) :
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(netdev->ifi_flags & ~IFF_UP);
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rtmmsg->ifi_index = ifindex;
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rtmmsg->ifi_change = IFF_UP;
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rtmmsg->ifi_flags = powered ? IFF_UP : 0;
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if (callback) {
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cb_data = l_new(struct set_powered_cb_data, 1);
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cb_data->netdev = netdev;
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cb_data->callback = callback;
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cb_data->user_data = user_data;
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cb_data->destroy = destroy;
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}
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l_netlink_send(rtnl, RTM_SETLINK, 0, rtmmsg, bufsize,
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netdev_set_powered_result, cb_data,
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netdev_set_powered_destroy);
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id = l_netlink_send(rtnl, RTM_SETLINK, 0, rtmmsg, bufsize,
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cb, user_data, destroy);
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l_free(rtmmsg);
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return id;
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}
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int netdev_set_powered(struct netdev *netdev, bool powered,
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netdev_set_powered_cb_t callback, void *user_data,
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netdev_destroy_func_t destroy)
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{
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if (netdev->set_powered_cmd_id)
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return -EBUSY;
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netdev->set_powered_cmd_id =
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rtnl_set_powered(netdev->index, powered,
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netdev_set_powered_result, netdev,
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netdev_set_powered_destroy);
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if (!netdev->set_powered_cmd_id)
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return -EIO;
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netdev->set_powered_cb = callback;
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netdev->set_powered_user_data = user_data;
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netdev->set_powered_destroy = destroy;
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return 0;
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}
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@ -608,6 +617,11 @@ static void netdev_free(void *data)
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netdev->leave_adhoc_cmd_id = 0;
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}
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if (netdev->set_powered_cmd_id) {
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l_netlink_cancel(rtnl, netdev->set_powered_cmd_id);
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netdev->set_powered_cmd_id = 0;
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}
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device_remove(netdev->device);
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watchlist_destroy(&netdev->event_watches);
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watchlist_destroy(&netdev->frame_watches);
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@ -626,7 +640,7 @@ static void netdev_shutdown_one(void *data, void *user_data)
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netdev_set_iftype(netdev, NETDEV_IFTYPE_STATION);
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if (netdev_get_is_up(netdev))
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netdev_set_powered(netdev, false, NULL, NULL, NULL);
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rtnl_set_powered(netdev->index, false, NULL, NULL, NULL);
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}
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static bool netdev_match(const void *a, const void *b)
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@ -4037,14 +4051,18 @@ static void netdev_dellink_notify(const struct ifinfomsg *ifi, int bytes)
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netdev_free(netdev);
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}
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static void netdev_initial_up_cb(struct netdev *netdev, int result,
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void *user_data)
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static void netdev_initial_up_cb(int error, uint16_t type, const void *data,
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uint32_t len, void *user_data)
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{
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if (result != 0) {
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l_error("Error bringing interface %i up: %s", netdev->index,
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strerror(-result));
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struct netdev *netdev = user_data;
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if (result != -ERFKILL)
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netdev->set_powered_cmd_id = 0;
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if (error != 0) {
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l_error("Error bringing interface %i up: %s", netdev->index,
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strerror(-error));
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if (error != -ERFKILL)
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return;
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}
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@ -4064,18 +4082,22 @@ static void netdev_initial_up_cb(struct netdev *netdev, int result,
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netdev->device = device_create(netdev->wiphy, netdev);
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}
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static void netdev_initial_down_cb(struct netdev *netdev, int result,
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void *user_data)
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static void netdev_initial_down_cb(int error, uint16_t type, const void *data,
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uint32_t len, void *user_data)
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{
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if (result != 0) {
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l_error("Error taking interface %i down: %s", netdev->index,
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strerror(-result));
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struct netdev *netdev = user_data;
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if (error != 0) {
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l_error("Error taking interface %i down: %s", netdev->index,
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strerror(-error));
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netdev->set_powered_cmd_id = 0;
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return;
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}
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netdev_set_powered(netdev, true, netdev_initial_up_cb,
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NULL, NULL);
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netdev->set_powered_cmd_id =
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rtnl_set_powered(netdev->index, true, netdev_initial_up_cb,
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netdev, NULL);
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}
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static void netdev_getlink_cb(int error, uint16_t type, const void *data,
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@ -4084,6 +4106,8 @@ static void netdev_getlink_cb(int error, uint16_t type, const void *data,
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const struct ifinfomsg *ifi = data;
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unsigned int bytes;
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struct netdev *netdev;
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l_netlink_command_func_t cb;
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bool powered;
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if (error != 0 || ifi->ifi_type != ARPHRD_ETHER ||
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type != RTM_NEWLINK) {
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@ -4104,11 +4128,11 @@ static void netdev_getlink_cb(int error, uint16_t type, const void *data,
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* If the interface is UP, reset it to ensure a clean state,
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* otherwise just bring it UP.
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*/
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if (netdev_get_is_up(netdev)) {
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netdev_set_powered(netdev, false, netdev_initial_down_cb,
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NULL, NULL);
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} else
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netdev_initial_down_cb(netdev, 0, NULL);
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powered = netdev_get_is_up(netdev);
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cb = powered ? netdev_initial_down_cb : netdev_initial_up_cb;
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netdev->set_powered_cmd_id =
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rtnl_set_powered(ifi->ifi_index, !powered, cb, netdev, NULL);
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}
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static bool netdev_is_managed(const char *ifname)
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