1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
4 * RMNET configuration engine
8 #include <linux/module.h>
9 #include <linux/netlink.h>
10 #include <linux/netdevice.h>
11 #include "rmnet_config.h"
12 #include "rmnet_handlers.h"
13 #include "rmnet_vnd.h"
14 #include "rmnet_private.h"
16 /* Local Definitions and Declarations */
18 static const struct nla_policy rmnet_policy[IFLA_RMNET_MAX + 1] = {
19 [IFLA_RMNET_MUX_ID] = { .type = NLA_U16 },
20 [IFLA_RMNET_FLAGS] = { .len = sizeof(struct ifla_rmnet_flags) },
23 static int rmnet_is_real_dev_registered(const struct net_device *real_dev)
25 return rcu_access_pointer(real_dev->rx_handler) == rmnet_rx_handler;
29 static struct rmnet_port*
30 rmnet_get_port_rtnl(const struct net_device *real_dev)
32 return rtnl_dereference(real_dev->rx_handler_data);
35 static int rmnet_unregister_real_device(struct net_device *real_dev)
37 struct rmnet_port *port = rmnet_get_port_rtnl(real_dev);
39 if (port->nr_rmnet_devs)
42 netdev_rx_handler_unregister(real_dev);
46 netdev_dbg(real_dev, "Removed from rmnet\n");
50 static int rmnet_register_real_device(struct net_device *real_dev)
52 struct rmnet_port *port;
57 if (rmnet_is_real_dev_registered(real_dev))
60 port = kzalloc(sizeof(*port), GFP_ATOMIC);
65 rc = netdev_rx_handler_register(real_dev, rmnet_rx_handler, port);
71 for (entry = 0; entry < RMNET_MAX_LOGICAL_EP; entry++)
72 INIT_HLIST_HEAD(&port->muxed_ep[entry]);
74 netdev_dbg(real_dev, "registered with rmnet\n");
78 static void rmnet_unregister_bridge(struct rmnet_port *port)
80 struct net_device *bridge_dev, *real_dev, *rmnet_dev;
81 struct rmnet_port *real_port;
83 if (port->rmnet_mode != RMNET_EPMODE_BRIDGE)
86 rmnet_dev = port->rmnet_dev;
87 if (!port->nr_rmnet_devs) {
89 real_dev = port->bridge_ep;
90 bridge_dev = port->dev;
92 real_port = rmnet_get_port_rtnl(real_dev);
93 real_port->bridge_ep = NULL;
94 real_port->rmnet_mode = RMNET_EPMODE_VND;
97 bridge_dev = port->bridge_ep;
99 port->bridge_ep = NULL;
100 port->rmnet_mode = RMNET_EPMODE_VND;
103 netdev_upper_dev_unlink(bridge_dev, rmnet_dev);
104 rmnet_unregister_real_device(bridge_dev);
107 static int rmnet_newlink(struct net *src_net, struct net_device *dev,
108 struct nlattr *tb[], struct nlattr *data[],
109 struct netlink_ext_ack *extack)
111 u32 data_format = RMNET_FLAGS_INGRESS_DEAGGREGATION;
112 struct net_device *real_dev;
113 int mode = RMNET_EPMODE_VND;
114 struct rmnet_endpoint *ep;
115 struct rmnet_port *port;
119 if (!tb[IFLA_LINK]) {
120 NL_SET_ERR_MSG_MOD(extack, "link not specified");
124 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
125 if (!real_dev || !dev)
128 if (!data[IFLA_RMNET_MUX_ID])
131 ep = kzalloc(sizeof(*ep), GFP_ATOMIC);
135 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
137 err = rmnet_register_real_device(real_dev);
141 port = rmnet_get_port_rtnl(real_dev);
142 err = rmnet_vnd_newlink(mux_id, dev, port, real_dev, ep);
146 err = netdev_upper_dev_link(real_dev, dev, extack);
150 port->rmnet_mode = mode;
151 port->rmnet_dev = dev;
153 hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]);
155 if (data[IFLA_RMNET_FLAGS]) {
156 struct ifla_rmnet_flags *flags;
158 flags = nla_data(data[IFLA_RMNET_FLAGS]);
159 data_format = flags->flags & flags->mask;
162 netdev_dbg(dev, "data format [0x%08X]\n", data_format);
163 port->data_format = data_format;
168 unregister_netdevice(dev);
169 rmnet_vnd_dellink(mux_id, port, ep);
171 rmnet_unregister_real_device(real_dev);
177 static void rmnet_dellink(struct net_device *dev, struct list_head *head)
179 struct rmnet_priv *priv = netdev_priv(dev);
180 struct net_device *real_dev, *bridge_dev;
181 struct rmnet_port *real_port, *bridge_port;
182 struct rmnet_endpoint *ep;
183 u8 mux_id = priv->mux_id;
185 real_dev = priv->real_dev;
187 if (!rmnet_is_real_dev_registered(real_dev))
190 real_port = rmnet_get_port_rtnl(real_dev);
191 bridge_dev = real_port->bridge_ep;
193 bridge_port = rmnet_get_port_rtnl(bridge_dev);
194 rmnet_unregister_bridge(bridge_port);
197 ep = rmnet_get_endpoint(real_port, mux_id);
199 hlist_del_init_rcu(&ep->hlnode);
200 rmnet_vnd_dellink(mux_id, real_port, ep);
204 netdev_upper_dev_unlink(real_dev, dev);
205 rmnet_unregister_real_device(real_dev);
206 unregister_netdevice_queue(dev, head);
209 static void rmnet_force_unassociate_device(struct net_device *real_dev)
211 struct hlist_node *tmp_ep;
212 struct rmnet_endpoint *ep;
213 struct rmnet_port *port;
214 unsigned long bkt_ep;
217 port = rmnet_get_port_rtnl(real_dev);
219 if (port->nr_rmnet_devs) {
221 rmnet_unregister_bridge(port);
222 hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) {
223 unregister_netdevice_queue(ep->egress_dev, &list);
224 netdev_upper_dev_unlink(real_dev, ep->egress_dev);
225 rmnet_vnd_dellink(ep->mux_id, port, ep);
226 hlist_del_init_rcu(&ep->hlnode);
229 rmnet_unregister_real_device(real_dev);
230 unregister_netdevice_many(&list);
232 rmnet_unregister_bridge(port);
236 static int rmnet_config_notify_cb(struct notifier_block *nb,
237 unsigned long event, void *data)
239 struct net_device *real_dev = netdev_notifier_info_to_dev(data);
241 if (!rmnet_is_real_dev_registered(real_dev))
245 case NETDEV_UNREGISTER:
246 netdev_dbg(real_dev, "Kernel unregister\n");
247 rmnet_force_unassociate_device(real_dev);
257 static struct notifier_block rmnet_dev_notifier __read_mostly = {
258 .notifier_call = rmnet_config_notify_cb,
261 static int rmnet_rtnl_validate(struct nlattr *tb[], struct nlattr *data[],
262 struct netlink_ext_ack *extack)
266 if (!data || !data[IFLA_RMNET_MUX_ID])
269 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
270 if (mux_id > (RMNET_MAX_LOGICAL_EP - 1))
276 static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[],
277 struct nlattr *data[],
278 struct netlink_ext_ack *extack)
280 struct rmnet_priv *priv = netdev_priv(dev);
281 struct net_device *real_dev;
282 struct rmnet_endpoint *ep;
283 struct rmnet_port *port;
289 real_dev = priv->real_dev;
290 if (!rmnet_is_real_dev_registered(real_dev))
293 port = rmnet_get_port_rtnl(real_dev);
295 if (data[IFLA_RMNET_MUX_ID]) {
296 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
297 if (rmnet_get_endpoint(port, mux_id)) {
298 NL_SET_ERR_MSG_MOD(extack, "MUX ID already exists");
301 ep = rmnet_get_endpoint(port, priv->mux_id);
305 hlist_del_init_rcu(&ep->hlnode);
306 hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]);
309 priv->mux_id = mux_id;
312 if (data[IFLA_RMNET_FLAGS]) {
313 struct ifla_rmnet_flags *flags;
315 flags = nla_data(data[IFLA_RMNET_FLAGS]);
316 port->data_format = flags->flags & flags->mask;
322 static size_t rmnet_get_size(const struct net_device *dev)
325 /* IFLA_RMNET_MUX_ID */
327 /* IFLA_RMNET_FLAGS */
328 nla_total_size(sizeof(struct ifla_rmnet_flags));
331 static int rmnet_fill_info(struct sk_buff *skb, const struct net_device *dev)
333 struct rmnet_priv *priv = netdev_priv(dev);
334 struct net_device *real_dev;
335 struct ifla_rmnet_flags f;
336 struct rmnet_port *port;
338 real_dev = priv->real_dev;
340 if (nla_put_u16(skb, IFLA_RMNET_MUX_ID, priv->mux_id))
341 goto nla_put_failure;
343 if (rmnet_is_real_dev_registered(real_dev)) {
344 port = rmnet_get_port_rtnl(real_dev);
345 f.flags = port->data_format;
352 if (nla_put(skb, IFLA_RMNET_FLAGS, sizeof(f), &f))
353 goto nla_put_failure;
361 struct rtnl_link_ops rmnet_link_ops __read_mostly = {
363 .maxtype = __IFLA_RMNET_MAX,
364 .priv_size = sizeof(struct rmnet_priv),
365 .setup = rmnet_vnd_setup,
366 .validate = rmnet_rtnl_validate,
367 .newlink = rmnet_newlink,
368 .dellink = rmnet_dellink,
369 .get_size = rmnet_get_size,
370 .changelink = rmnet_changelink,
371 .policy = rmnet_policy,
372 .fill_info = rmnet_fill_info,
375 struct rmnet_port *rmnet_get_port_rcu(struct net_device *real_dev)
377 if (rmnet_is_real_dev_registered(real_dev))
378 return rcu_dereference_bh(real_dev->rx_handler_data);
383 struct rmnet_endpoint *rmnet_get_endpoint(struct rmnet_port *port, u8 mux_id)
385 struct rmnet_endpoint *ep;
387 hlist_for_each_entry_rcu(ep, &port->muxed_ep[mux_id], hlnode) {
388 if (ep->mux_id == mux_id)
395 int rmnet_add_bridge(struct net_device *rmnet_dev,
396 struct net_device *slave_dev,
397 struct netlink_ext_ack *extack)
399 struct rmnet_priv *priv = netdev_priv(rmnet_dev);
400 struct net_device *real_dev = priv->real_dev;
401 struct rmnet_port *port, *slave_port;
404 port = rmnet_get_port_rtnl(real_dev);
406 /* If there is more than one rmnet dev attached, its probably being
407 * used for muxing. Skip the briding in that case
409 if (port->nr_rmnet_devs > 1)
412 if (port->rmnet_mode != RMNET_EPMODE_VND)
415 if (rmnet_is_real_dev_registered(slave_dev))
418 err = rmnet_register_real_device(slave_dev);
422 err = netdev_master_upper_dev_link(slave_dev, rmnet_dev, NULL, NULL,
425 rmnet_unregister_real_device(slave_dev);
429 slave_port = rmnet_get_port_rtnl(slave_dev);
430 slave_port->rmnet_mode = RMNET_EPMODE_BRIDGE;
431 slave_port->bridge_ep = real_dev;
432 slave_port->rmnet_dev = rmnet_dev;
434 port->rmnet_mode = RMNET_EPMODE_BRIDGE;
435 port->bridge_ep = slave_dev;
437 netdev_dbg(slave_dev, "registered with rmnet as slave\n");
441 int rmnet_del_bridge(struct net_device *rmnet_dev,
442 struct net_device *slave_dev)
444 struct rmnet_port *port = rmnet_get_port_rtnl(slave_dev);
446 rmnet_unregister_bridge(port);
448 netdev_dbg(slave_dev, "removed from rmnet as slave\n");
452 /* Startup/Shutdown */
454 static int __init rmnet_init(void)
458 rc = register_netdevice_notifier(&rmnet_dev_notifier);
462 rc = rtnl_link_register(&rmnet_link_ops);
464 unregister_netdevice_notifier(&rmnet_dev_notifier);
470 static void __exit rmnet_exit(void)
472 rtnl_link_unregister(&rmnet_link_ops);
473 unregister_netdevice_notifier(&rmnet_dev_notifier);
476 module_init(rmnet_init)
477 module_exit(rmnet_exit)
478 MODULE_LICENSE("GPL v2");