1 /* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * RMNET configuration engine
17 #include <linux/module.h>
18 #include <linux/netlink.h>
19 #include <linux/netdevice.h>
20 #include "rmnet_config.h"
21 #include "rmnet_handlers.h"
22 #include "rmnet_vnd.h"
23 #include "rmnet_private.h"
25 /* Local Definitions and Declarations */
27 static const struct nla_policy rmnet_policy[IFLA_RMNET_MAX + 1] = {
28 [IFLA_RMNET_MUX_ID] = { .type = NLA_U16 },
29 [IFLA_RMNET_FLAGS] = { .len = sizeof(struct ifla_rmnet_flags) },
32 static int rmnet_is_real_dev_registered(const struct net_device *real_dev)
34 return rcu_access_pointer(real_dev->rx_handler) == rmnet_rx_handler;
38 static struct rmnet_port*
39 rmnet_get_port_rtnl(const struct net_device *real_dev)
41 return rtnl_dereference(real_dev->rx_handler_data);
44 static int rmnet_unregister_real_device(struct net_device *real_dev)
46 struct rmnet_port *port = rmnet_get_port_rtnl(real_dev);
48 if (port->nr_rmnet_devs)
51 netdev_rx_handler_unregister(real_dev);
55 netdev_dbg(real_dev, "Removed from rmnet\n");
59 static int rmnet_register_real_device(struct net_device *real_dev,
60 struct netlink_ext_ack *extack)
62 struct rmnet_port *port;
67 if (rmnet_is_real_dev_registered(real_dev)) {
68 port = rmnet_get_port_rtnl(real_dev);
69 if (port->rmnet_mode != RMNET_EPMODE_VND) {
70 NL_SET_ERR_MSG_MOD(extack, "bridge device already exists");
77 port = kzalloc(sizeof(*port), GFP_ATOMIC);
82 rc = netdev_rx_handler_register(real_dev, rmnet_rx_handler, port);
88 for (entry = 0; entry < RMNET_MAX_LOGICAL_EP; entry++)
89 INIT_HLIST_HEAD(&port->muxed_ep[entry]);
91 netdev_dbg(real_dev, "registered with rmnet\n");
95 static void rmnet_unregister_bridge(struct rmnet_port *port)
97 struct net_device *bridge_dev, *real_dev, *rmnet_dev;
98 struct rmnet_port *real_port;
100 if (port->rmnet_mode != RMNET_EPMODE_BRIDGE)
103 rmnet_dev = port->rmnet_dev;
104 if (!port->nr_rmnet_devs) {
106 real_dev = port->bridge_ep;
107 bridge_dev = port->dev;
109 real_port = rmnet_get_port_rtnl(real_dev);
110 real_port->bridge_ep = NULL;
111 real_port->rmnet_mode = RMNET_EPMODE_VND;
114 bridge_dev = port->bridge_ep;
116 port->bridge_ep = NULL;
117 port->rmnet_mode = RMNET_EPMODE_VND;
120 netdev_upper_dev_unlink(bridge_dev, rmnet_dev);
121 rmnet_unregister_real_device(bridge_dev);
124 static int rmnet_newlink(struct net *src_net, struct net_device *dev,
125 struct nlattr *tb[], struct nlattr *data[],
126 struct netlink_ext_ack *extack)
128 u32 data_format = RMNET_FLAGS_INGRESS_DEAGGREGATION;
129 struct net_device *real_dev;
130 int mode = RMNET_EPMODE_VND;
131 struct rmnet_endpoint *ep;
132 struct rmnet_port *port;
136 if (!tb[IFLA_LINK]) {
137 NL_SET_ERR_MSG_MOD(extack, "link not specified");
141 real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
142 if (!real_dev || !dev)
145 if (!data[IFLA_RMNET_MUX_ID])
148 ep = kzalloc(sizeof(*ep), GFP_ATOMIC);
152 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
154 err = rmnet_register_real_device(real_dev, extack);
158 port = rmnet_get_port_rtnl(real_dev);
159 err = rmnet_vnd_newlink(mux_id, dev, port, real_dev, ep);
163 err = netdev_upper_dev_link(real_dev, dev, extack);
167 port->rmnet_mode = mode;
168 port->rmnet_dev = dev;
170 hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]);
172 if (data[IFLA_RMNET_FLAGS]) {
173 struct ifla_rmnet_flags *flags;
175 flags = nla_data(data[IFLA_RMNET_FLAGS]);
176 data_format = flags->flags & flags->mask;
179 netdev_dbg(dev, "data format [0x%08X]\n", data_format);
180 port->data_format = data_format;
185 unregister_netdevice(dev);
186 rmnet_vnd_dellink(mux_id, port, ep);
188 rmnet_unregister_real_device(real_dev);
194 static void rmnet_dellink(struct net_device *dev, struct list_head *head)
196 struct rmnet_priv *priv = netdev_priv(dev);
197 struct net_device *real_dev, *bridge_dev;
198 struct rmnet_port *real_port, *bridge_port;
199 struct rmnet_endpoint *ep;
200 u8 mux_id = priv->mux_id;
202 real_dev = priv->real_dev;
204 if (!rmnet_is_real_dev_registered(real_dev))
207 real_port = rmnet_get_port_rtnl(real_dev);
208 bridge_dev = real_port->bridge_ep;
210 bridge_port = rmnet_get_port_rtnl(bridge_dev);
211 rmnet_unregister_bridge(bridge_port);
214 ep = rmnet_get_endpoint(real_port, mux_id);
216 hlist_del_init_rcu(&ep->hlnode);
217 rmnet_vnd_dellink(mux_id, real_port, ep);
221 netdev_upper_dev_unlink(real_dev, dev);
222 rmnet_unregister_real_device(real_dev);
223 unregister_netdevice_queue(dev, head);
226 static void rmnet_force_unassociate_device(struct net_device *real_dev)
228 struct hlist_node *tmp_ep;
229 struct rmnet_endpoint *ep;
230 struct rmnet_port *port;
231 unsigned long bkt_ep;
234 port = rmnet_get_port_rtnl(real_dev);
236 if (port->nr_rmnet_devs) {
238 rmnet_unregister_bridge(port);
239 hash_for_each_safe(port->muxed_ep, bkt_ep, tmp_ep, ep, hlnode) {
240 unregister_netdevice_queue(ep->egress_dev, &list);
241 netdev_upper_dev_unlink(real_dev, ep->egress_dev);
242 rmnet_vnd_dellink(ep->mux_id, port, ep);
243 hlist_del_init_rcu(&ep->hlnode);
246 rmnet_unregister_real_device(real_dev);
247 unregister_netdevice_many(&list);
249 rmnet_unregister_bridge(port);
253 static int rmnet_config_notify_cb(struct notifier_block *nb,
254 unsigned long event, void *data)
256 struct net_device *real_dev = netdev_notifier_info_to_dev(data);
258 if (!rmnet_is_real_dev_registered(real_dev))
262 case NETDEV_UNREGISTER:
263 netdev_dbg(real_dev, "Kernel unregister\n");
264 rmnet_force_unassociate_device(real_dev);
274 static struct notifier_block rmnet_dev_notifier __read_mostly = {
275 .notifier_call = rmnet_config_notify_cb,
278 static int rmnet_rtnl_validate(struct nlattr *tb[], struct nlattr *data[],
279 struct netlink_ext_ack *extack)
283 if (!data || !data[IFLA_RMNET_MUX_ID])
286 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
287 if (mux_id > (RMNET_MAX_LOGICAL_EP - 1))
293 static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[],
294 struct nlattr *data[],
295 struct netlink_ext_ack *extack)
297 struct rmnet_priv *priv = netdev_priv(dev);
298 struct net_device *real_dev;
299 struct rmnet_port *port;
305 real_dev = priv->real_dev;
306 if (!rmnet_is_real_dev_registered(real_dev))
309 port = rmnet_get_port_rtnl(real_dev);
311 if (data[IFLA_RMNET_MUX_ID]) {
312 mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
314 if (mux_id != priv->mux_id) {
315 struct rmnet_endpoint *ep;
317 ep = rmnet_get_endpoint(port, priv->mux_id);
321 if (rmnet_get_endpoint(port, mux_id)) {
322 NL_SET_ERR_MSG_MOD(extack,
323 "MUX ID already exists");
327 hlist_del_init_rcu(&ep->hlnode);
328 hlist_add_head_rcu(&ep->hlnode,
329 &port->muxed_ep[mux_id]);
332 priv->mux_id = mux_id;
336 if (data[IFLA_RMNET_FLAGS]) {
337 struct ifla_rmnet_flags *flags;
339 flags = nla_data(data[IFLA_RMNET_FLAGS]);
340 port->data_format = flags->flags & flags->mask;
346 static size_t rmnet_get_size(const struct net_device *dev)
349 /* IFLA_RMNET_MUX_ID */
351 /* IFLA_RMNET_FLAGS */
352 nla_total_size(sizeof(struct ifla_rmnet_flags));
355 static int rmnet_fill_info(struct sk_buff *skb, const struct net_device *dev)
357 struct rmnet_priv *priv = netdev_priv(dev);
358 struct net_device *real_dev;
359 struct ifla_rmnet_flags f;
360 struct rmnet_port *port;
362 real_dev = priv->real_dev;
364 if (nla_put_u16(skb, IFLA_RMNET_MUX_ID, priv->mux_id))
365 goto nla_put_failure;
367 if (rmnet_is_real_dev_registered(real_dev)) {
368 port = rmnet_get_port_rtnl(real_dev);
369 f.flags = port->data_format;
376 if (nla_put(skb, IFLA_RMNET_FLAGS, sizeof(f), &f))
377 goto nla_put_failure;
385 struct rtnl_link_ops rmnet_link_ops __read_mostly = {
387 .maxtype = __IFLA_RMNET_MAX,
388 .priv_size = sizeof(struct rmnet_priv),
389 .setup = rmnet_vnd_setup,
390 .validate = rmnet_rtnl_validate,
391 .newlink = rmnet_newlink,
392 .dellink = rmnet_dellink,
393 .get_size = rmnet_get_size,
394 .changelink = rmnet_changelink,
395 .policy = rmnet_policy,
396 .fill_info = rmnet_fill_info,
399 struct rmnet_port *rmnet_get_port_rcu(struct net_device *real_dev)
401 if (rmnet_is_real_dev_registered(real_dev))
402 return rcu_dereference_bh(real_dev->rx_handler_data);
407 struct rmnet_endpoint *rmnet_get_endpoint(struct rmnet_port *port, u8 mux_id)
409 struct rmnet_endpoint *ep;
411 hlist_for_each_entry_rcu(ep, &port->muxed_ep[mux_id], hlnode) {
412 if (ep->mux_id == mux_id)
419 int rmnet_add_bridge(struct net_device *rmnet_dev,
420 struct net_device *slave_dev,
421 struct netlink_ext_ack *extack)
423 struct rmnet_priv *priv = netdev_priv(rmnet_dev);
424 struct net_device *real_dev = priv->real_dev;
425 struct rmnet_port *port, *slave_port;
428 port = rmnet_get_port_rtnl(real_dev);
430 /* If there is more than one rmnet dev attached, its probably being
431 * used for muxing. Skip the briding in that case
433 if (port->nr_rmnet_devs > 1)
436 if (rmnet_is_real_dev_registered(slave_dev))
439 err = rmnet_register_real_device(slave_dev, extack);
443 err = netdev_master_upper_dev_link(slave_dev, rmnet_dev, NULL, NULL,
446 rmnet_unregister_real_device(slave_dev);
450 slave_port = rmnet_get_port_rtnl(slave_dev);
451 slave_port->rmnet_mode = RMNET_EPMODE_BRIDGE;
452 slave_port->bridge_ep = real_dev;
453 slave_port->rmnet_dev = rmnet_dev;
455 port->rmnet_mode = RMNET_EPMODE_BRIDGE;
456 port->bridge_ep = slave_dev;
458 netdev_dbg(slave_dev, "registered with rmnet as slave\n");
462 int rmnet_del_bridge(struct net_device *rmnet_dev,
463 struct net_device *slave_dev)
465 struct rmnet_port *port = rmnet_get_port_rtnl(slave_dev);
467 rmnet_unregister_bridge(port);
469 netdev_dbg(slave_dev, "removed from rmnet as slave\n");
473 /* Startup/Shutdown */
475 static int __init rmnet_init(void)
479 rc = register_netdevice_notifier(&rmnet_dev_notifier);
483 rc = rtnl_link_register(&rmnet_link_ops);
485 unregister_netdevice_notifier(&rmnet_dev_notifier);
491 static void __exit rmnet_exit(void)
493 rtnl_link_unregister(&rmnet_link_ops);
494 unregister_netdevice_notifier(&rmnet_dev_notifier);
497 module_init(rmnet_init)
498 module_exit(rmnet_exit)
499 MODULE_LICENSE("GPL v2");