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_KERNEL);
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]));
126 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
130 ep = kzalloc(sizeof(*ep), GFP_KERNEL);
134 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
136 err = rmnet_register_real_device(real_dev);
140 port = rmnet_get_port_rtnl(real_dev);
141 err = rmnet_vnd_newlink(mux_id, dev, port, real_dev, ep, extack);
145 err = netdev_upper_dev_link(real_dev, dev, extack);
149 port->rmnet_mode = mode;
150 port->rmnet_dev = dev;
152 hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]);
154 if (data[IFLA_RMNET_FLAGS]) {
155 struct ifla_rmnet_flags *flags;
157 flags = nla_data(data[IFLA_RMNET_FLAGS]);
158 data_format = flags->flags & flags->mask;
161 netdev_dbg(dev, "data format [0x%08X]\n", data_format);
162 port->data_format = data_format;
167 unregister_netdevice(dev);
168 rmnet_vnd_dellink(mux_id, port, ep);
170 rmnet_unregister_real_device(real_dev);
176 static void rmnet_dellink(struct net_device *dev, struct list_head *head)
178 struct rmnet_priv *priv = netdev_priv(dev);
179 struct net_device *real_dev, *bridge_dev;
180 struct rmnet_port *real_port, *bridge_port;
181 struct rmnet_endpoint *ep;
182 u8 mux_id = priv->mux_id;
184 real_dev = priv->real_dev;
186 if (!rmnet_is_real_dev_registered(real_dev))
189 real_port = rmnet_get_port_rtnl(real_dev);
190 bridge_dev = real_port->bridge_ep;
192 bridge_port = rmnet_get_port_rtnl(bridge_dev);
193 rmnet_unregister_bridge(bridge_port);
196 ep = rmnet_get_endpoint(real_port, mux_id);
198 hlist_del_init_rcu(&ep->hlnode);
199 rmnet_vnd_dellink(mux_id, real_port, ep);
203 netdev_upper_dev_unlink(real_dev, dev);
204 rmnet_unregister_real_device(real_dev);
205 unregister_netdevice_queue(dev, head);
208 static void rmnet_force_unassociate_device(struct net_device *real_dev)
210 struct hlist_node *tmp_ep;
211 struct rmnet_endpoint *ep;
212 struct rmnet_port *port;
213 unsigned long bkt_ep;
216 port = rmnet_get_port_rtnl(real_dev);
218 if (port->nr_rmnet_devs) {
220 rmnet_unregister_bridge(port);
221 hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) {
222 unregister_netdevice_queue(ep->egress_dev, &list);
223 netdev_upper_dev_unlink(real_dev, ep->egress_dev);
224 rmnet_vnd_dellink(ep->mux_id, port, ep);
225 hlist_del_init_rcu(&ep->hlnode);
228 rmnet_unregister_real_device(real_dev);
229 unregister_netdevice_many(&list);
231 rmnet_unregister_bridge(port);
235 static int rmnet_config_notify_cb(struct notifier_block *nb,
236 unsigned long event, void *data)
238 struct net_device *real_dev = netdev_notifier_info_to_dev(data);
240 if (!rmnet_is_real_dev_registered(real_dev))
244 case NETDEV_UNREGISTER:
245 netdev_dbg(real_dev, "Kernel unregister\n");
246 rmnet_force_unassociate_device(real_dev);
256 static struct notifier_block rmnet_dev_notifier __read_mostly = {
257 .notifier_call = rmnet_config_notify_cb,
260 static int rmnet_rtnl_validate(struct nlattr *tb[], struct nlattr *data[],
261 struct netlink_ext_ack *extack)
265 if (!data || !data[IFLA_RMNET_MUX_ID]) {
266 NL_SET_ERR_MSG_MOD(extack, "MUX ID not specified");
270 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
271 if (mux_id > (RMNET_MAX_LOGICAL_EP - 1)) {
272 NL_SET_ERR_MSG_MOD(extack, "invalid MUX ID");
279 static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[],
280 struct nlattr *data[],
281 struct netlink_ext_ack *extack)
283 struct rmnet_priv *priv = netdev_priv(dev);
284 struct net_device *real_dev;
285 struct rmnet_endpoint *ep;
286 struct rmnet_port *port;
292 real_dev = priv->real_dev;
293 if (!rmnet_is_real_dev_registered(real_dev))
296 port = rmnet_get_port_rtnl(real_dev);
298 if (data[IFLA_RMNET_MUX_ID]) {
299 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
300 if (rmnet_get_endpoint(port, mux_id)) {
301 NL_SET_ERR_MSG_MOD(extack, "MUX ID already exists");
304 ep = rmnet_get_endpoint(port, priv->mux_id);
308 hlist_del_init_rcu(&ep->hlnode);
309 hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]);
312 priv->mux_id = mux_id;
315 if (data[IFLA_RMNET_FLAGS]) {
316 struct ifla_rmnet_flags *flags;
318 flags = nla_data(data[IFLA_RMNET_FLAGS]);
319 port->data_format = flags->flags & flags->mask;
325 static size_t rmnet_get_size(const struct net_device *dev)
328 /* IFLA_RMNET_MUX_ID */
330 /* IFLA_RMNET_FLAGS */
331 nla_total_size(sizeof(struct ifla_rmnet_flags));
334 static int rmnet_fill_info(struct sk_buff *skb, const struct net_device *dev)
336 struct rmnet_priv *priv = netdev_priv(dev);
337 struct net_device *real_dev;
338 struct ifla_rmnet_flags f;
339 struct rmnet_port *port;
341 real_dev = priv->real_dev;
343 if (nla_put_u16(skb, IFLA_RMNET_MUX_ID, priv->mux_id))
344 goto nla_put_failure;
346 if (rmnet_is_real_dev_registered(real_dev)) {
347 port = rmnet_get_port_rtnl(real_dev);
348 f.flags = port->data_format;
355 if (nla_put(skb, IFLA_RMNET_FLAGS, sizeof(f), &f))
356 goto nla_put_failure;
364 struct rtnl_link_ops rmnet_link_ops __read_mostly = {
366 .maxtype = __IFLA_RMNET_MAX,
367 .priv_size = sizeof(struct rmnet_priv),
368 .setup = rmnet_vnd_setup,
369 .validate = rmnet_rtnl_validate,
370 .newlink = rmnet_newlink,
371 .dellink = rmnet_dellink,
372 .get_size = rmnet_get_size,
373 .changelink = rmnet_changelink,
374 .policy = rmnet_policy,
375 .fill_info = rmnet_fill_info,
378 struct rmnet_port *rmnet_get_port_rcu(struct net_device *real_dev)
380 if (rmnet_is_real_dev_registered(real_dev))
381 return rcu_dereference_bh(real_dev->rx_handler_data);
386 struct rmnet_endpoint *rmnet_get_endpoint(struct rmnet_port *port, u8 mux_id)
388 struct rmnet_endpoint *ep;
390 hlist_for_each_entry_rcu(ep, &port->muxed_ep[mux_id], hlnode) {
391 if (ep->mux_id == mux_id)
398 int rmnet_add_bridge(struct net_device *rmnet_dev,
399 struct net_device *slave_dev,
400 struct netlink_ext_ack *extack)
402 struct rmnet_priv *priv = netdev_priv(rmnet_dev);
403 struct net_device *real_dev = priv->real_dev;
404 struct rmnet_port *port, *slave_port;
407 port = rmnet_get_port_rtnl(real_dev);
409 /* If there is more than one rmnet dev attached, its probably being
410 * used for muxing. Skip the briding in that case
412 if (port->nr_rmnet_devs > 1) {
413 NL_SET_ERR_MSG_MOD(extack, "more than one rmnet dev attached");
417 if (port->rmnet_mode != RMNET_EPMODE_VND) {
418 NL_SET_ERR_MSG_MOD(extack, "bridge device already exists");
422 if (rmnet_is_real_dev_registered(slave_dev)) {
423 NL_SET_ERR_MSG_MOD(extack,
424 "slave cannot be another rmnet dev");
429 err = rmnet_register_real_device(slave_dev);
433 err = netdev_master_upper_dev_link(slave_dev, rmnet_dev, NULL, NULL,
436 rmnet_unregister_real_device(slave_dev);
440 slave_port = rmnet_get_port_rtnl(slave_dev);
441 slave_port->rmnet_mode = RMNET_EPMODE_BRIDGE;
442 slave_port->bridge_ep = real_dev;
443 slave_port->rmnet_dev = rmnet_dev;
445 port->rmnet_mode = RMNET_EPMODE_BRIDGE;
446 port->bridge_ep = slave_dev;
448 netdev_dbg(slave_dev, "registered with rmnet as slave\n");
452 int rmnet_del_bridge(struct net_device *rmnet_dev,
453 struct net_device *slave_dev)
455 struct rmnet_port *port = rmnet_get_port_rtnl(slave_dev);
457 rmnet_unregister_bridge(port);
459 netdev_dbg(slave_dev, "removed from rmnet as slave\n");
463 /* Startup/Shutdown */
465 static int __init rmnet_init(void)
469 rc = register_netdevice_notifier(&rmnet_dev_notifier);
473 rc = rtnl_link_register(&rmnet_link_ops);
475 unregister_netdevice_notifier(&rmnet_dev_notifier);
481 static void __exit rmnet_exit(void)
483 rtnl_link_unregister(&rmnet_link_ops);
484 unregister_netdevice_notifier(&rmnet_dev_notifier);
487 module_init(rmnet_init)
488 module_exit(rmnet_exit)
489 MODULE_ALIAS_RTNL_LINK("rmnet");
490 MODULE_LICENSE("GPL v2");