blob: cde671d29d5dd36435e098930f209580d467f4fd [file] [log] [blame]
Thomas Gleixner2b27bdc2019-05-29 16:57:50 -07001// SPDX-License-Identifier: GPL-2.0-only
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -07002/*
3 * File: pn_dev.c
4 *
5 * Phonet network device
6 *
7 * Copyright (C) 2008 Nokia Corporation.
8 *
Rémi Denis-Courmont31fdc552012-06-13 22:29:03 +00009 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
10 * Rémi Denis-Courmont
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070011 */
12
13#include <linux/kernel.h>
14#include <linux/net.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070016#include <linux/netdevice.h>
17#include <linux/phonet.h>
David S. Miller421d20a2009-07-26 13:39:10 -070018#include <linux/proc_fs.h>
Rémi Denis-Courmontf5bb1c52009-09-09 00:00:05 +000019#include <linux/if_arp.h>
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070020#include <net/sock.h>
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +000021#include <net/netns/generic.h>
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070022#include <net/phonet/pn_dev.h>
23
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +000024struct phonet_routes {
Rémi Denis-Courmont88880132009-11-13 05:01:19 +000025 struct mutex lock;
Fabian Frederick79952bc2014-10-06 20:15:20 +020026 struct net_device __rcu *table[64];
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +000027};
28
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +000029struct phonet_net {
30 struct phonet_device_list pndevs;
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +000031 struct phonet_routes routes;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070032};
33
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +030034static unsigned int phonet_net_id __read_mostly;
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +000035
Jiri Pirko0db3f0f2010-04-26 03:41:00 +000036static struct phonet_net *phonet_pernet(struct net *net)
37{
Jiri Pirko0db3f0f2010-04-26 03:41:00 +000038 return net_generic(net, phonet_net_id);
39}
40
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +000041struct phonet_device_list *phonet_device_list(struct net *net)
42{
Jiri Pirko0db3f0f2010-04-26 03:41:00 +000043 struct phonet_net *pnn = phonet_pernet(net);
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +000044 return &pnn->pndevs;
45}
46
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070047/* Allocate new Phonet device. */
48static struct phonet_device *__phonet_device_alloc(struct net_device *dev)
49{
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +000050 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070051 struct phonet_device *pnd = kmalloc(sizeof(*pnd), GFP_ATOMIC);
52 if (pnd == NULL)
53 return NULL;
54 pnd->netdev = dev;
55 bitmap_zero(pnd->addrs, 64);
56
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -080057 BUG_ON(!mutex_is_locked(&pndevs->lock));
58 list_add_rcu(&pnd->list, &pndevs->list);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070059 return pnd;
60}
61
62static struct phonet_device *__phonet_get(struct net_device *dev)
63{
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +000064 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070065 struct phonet_device *pnd;
66
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -080067 BUG_ON(!mutex_is_locked(&pndevs->lock));
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +000068 list_for_each_entry(pnd, &pndevs->list, list) {
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070069 if (pnd->netdev == dev)
70 return pnd;
71 }
72 return NULL;
73}
74
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -080075static struct phonet_device *__phonet_get_rcu(struct net_device *dev)
76{
77 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
78 struct phonet_device *pnd;
79
80 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
81 if (pnd->netdev == dev)
82 return pnd;
83 }
84 return NULL;
85}
86
Rémi Denis-Courmont2be6fa42009-06-24 01:07:45 +000087static void phonet_device_destroy(struct net_device *dev)
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -070088{
Rémi Denis-Courmont2be6fa42009-06-24 01:07:45 +000089 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
90 struct phonet_device *pnd;
91
92 ASSERT_RTNL();
93
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -080094 mutex_lock(&pndevs->lock);
Rémi Denis-Courmont2be6fa42009-06-24 01:07:45 +000095 pnd = __phonet_get(dev);
96 if (pnd)
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -080097 list_del_rcu(&pnd->list);
98 mutex_unlock(&pndevs->lock);
Rémi Denis-Courmont2be6fa42009-06-24 01:07:45 +000099
100 if (pnd) {
101 u8 addr;
102
Akinobu Mitaa1ca14a2010-03-11 12:07:49 +0000103 for_each_set_bit(addr, pnd->addrs, 64)
Rémi Denis-Courmont2be6fa42009-06-24 01:07:45 +0000104 phonet_address_notify(RTM_DELADDR, dev, addr);
105 kfree(pnd);
106 }
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700107}
108
109struct net_device *phonet_device_get(struct net *net)
110{
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000111 struct phonet_device_list *pndevs = phonet_device_list(net);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700112 struct phonet_device *pnd;
Eric Dumazet59e57f42009-07-27 08:03:18 -0700113 struct net_device *dev = NULL;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700114
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800115 rcu_read_lock();
116 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700117 dev = pnd->netdev;
118 BUG_ON(!dev);
119
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000120 if ((dev->reg_state == NETREG_REGISTERED) &&
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700121 ((pnd->netdev->flags & IFF_UP)) == IFF_UP)
122 break;
123 dev = NULL;
124 }
Yajun Deng1160dfa2021-08-05 19:55:27 +0800125 dev_hold(dev);
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800126 rcu_read_unlock();
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700127 return dev;
128}
129
130int phonet_address_add(struct net_device *dev, u8 addr)
131{
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000132 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700133 struct phonet_device *pnd;
134 int err = 0;
135
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800136 mutex_lock(&pndevs->lock);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700137 /* Find or create Phonet-specific device data */
138 pnd = __phonet_get(dev);
139 if (pnd == NULL)
140 pnd = __phonet_device_alloc(dev);
141 if (unlikely(pnd == NULL))
142 err = -ENOMEM;
143 else if (test_and_set_bit(addr >> 2, pnd->addrs))
144 err = -EEXIST;
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800145 mutex_unlock(&pndevs->lock);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700146 return err;
147}
148
149int phonet_address_del(struct net_device *dev, u8 addr)
150{
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000151 struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700152 struct phonet_device *pnd;
153 int err = 0;
154
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800155 mutex_lock(&pndevs->lock);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700156 pnd = __phonet_get(dev);
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800157 if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs)) {
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700158 err = -EADDRNOTAVAIL;
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800159 pnd = NULL;
160 } else if (bitmap_empty(pnd->addrs, 64))
161 list_del_rcu(&pnd->list);
162 else
163 pnd = NULL;
164 mutex_unlock(&pndevs->lock);
165
Jiri Pirko88e75942010-06-07 03:27:39 +0000166 if (pnd)
Lai Jiangshan7e113a92011-03-18 12:09:03 +0800167 kfree_rcu(pnd, rcu);
Jiri Pirko88e75942010-06-07 03:27:39 +0000168
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700169 return err;
170}
171
172/* Gets a source address toward a destination, through a interface. */
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000173u8 phonet_address_get(struct net_device *dev, u8 daddr)
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700174{
175 struct phonet_device *pnd;
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000176 u8 saddr;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700177
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800178 rcu_read_lock();
179 pnd = __phonet_get_rcu(dev);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700180 if (pnd) {
181 BUG_ON(bitmap_empty(pnd->addrs, 64));
182
183 /* Use same source address as destination, if possible */
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000184 if (test_bit(daddr >> 2, pnd->addrs))
185 saddr = daddr;
186 else
187 saddr = find_first_bit(pnd->addrs, 64) << 2;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700188 } else
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000189 saddr = PN_NO_ADDR;
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800190 rcu_read_unlock();
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000191
192 if (saddr == PN_NO_ADDR) {
193 /* Fallback to another device */
194 struct net_device *def_dev;
195
196 def_dev = phonet_device_get(dev_net(dev));
197 if (def_dev) {
198 if (def_dev != dev)
199 saddr = phonet_address_get(def_dev, daddr);
200 dev_put(def_dev);
201 }
202 }
203 return saddr;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700204}
205
Rémi Denis-Courmont52404882008-12-03 15:42:56 -0800206int phonet_address_lookup(struct net *net, u8 addr)
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700207{
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000208 struct phonet_device_list *pndevs = phonet_device_list(net);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700209 struct phonet_device *pnd;
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000210 int err = -EADDRNOTAVAIL;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700211
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800212 rcu_read_lock();
213 list_for_each_entry_rcu(pnd, &pndevs->list, list) {
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700214 /* Don't allow unregistering devices! */
215 if ((pnd->netdev->reg_state != NETREG_REGISTERED) ||
216 ((pnd->netdev->flags & IFF_UP)) != IFF_UP)
217 continue;
218
219 if (test_bit(addr >> 2, pnd->addrs)) {
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000220 err = 0;
221 goto found;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700222 }
223 }
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000224found:
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800225 rcu_read_unlock();
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000226 return err;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700227}
228
Rémi Denis-Courmontf5bb1c52009-09-09 00:00:05 +0000229/* automatically configure a Phonet device, if supported */
230static int phonet_device_autoconf(struct net_device *dev)
231{
232 struct if_phonet_req req;
233 int ret;
234
Arnd Bergmann4747c1a2021-07-27 15:44:52 +0200235 if (!dev->netdev_ops->ndo_siocdevprivate)
Rémi Denis-Courmontf5bb1c52009-09-09 00:00:05 +0000236 return -EOPNOTSUPP;
237
Arnd Bergmann4747c1a2021-07-27 15:44:52 +0200238 ret = dev->netdev_ops->ndo_siocdevprivate(dev, (struct ifreq *)&req,
239 NULL, SIOCPNGAUTOCONF);
Rémi Denis-Courmontf5bb1c52009-09-09 00:00:05 +0000240 if (ret < 0)
241 return ret;
Rémi Denis-Courmontb11b5162009-09-14 03:10:27 +0000242
243 ASSERT_RTNL();
244 ret = phonet_address_add(dev, req.ifr_phonet_autoconf.device);
245 if (ret)
246 return ret;
247 phonet_address_notify(RTM_NEWADDR, dev,
248 req.ifr_phonet_autoconf.device);
249 return 0;
Rémi Denis-Courmontf5bb1c52009-09-09 00:00:05 +0000250}
251
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000252static void phonet_route_autodel(struct net_device *dev)
253{
Jiri Pirko0db3f0f2010-04-26 03:41:00 +0000254 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
Eric Dumazet95c96172012-04-15 05:58:06 +0000255 unsigned int i;
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000256 DECLARE_BITMAP(deleted, 64);
257
258 /* Remove left-over Phonet routes */
259 bitmap_zero(deleted, 64);
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000260 mutex_lock(&pnn->routes.lock);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000261 for (i = 0; i < 64; i++)
Fabian Frederick79952bc2014-10-06 20:15:20 +0200262 if (rcu_access_pointer(pnn->routes.table[i]) == dev) {
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000263 RCU_INIT_POINTER(pnn->routes.table[i], NULL);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000264 set_bit(i, deleted);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000265 }
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000266 mutex_unlock(&pnn->routes.lock);
267
268 if (bitmap_empty(deleted, 64))
269 return; /* short-circuit RCU */
270 synchronize_rcu();
Akinobu Mita6a499b22010-08-27 19:08:26 +0000271 for_each_set_bit(i, deleted, 64) {
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000272 rtm_phonet_notify(RTM_DELROUTE, dev, i);
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000273 dev_put(dev);
274 }
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000275}
276
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700277/* notify Phonet of device events */
278static int phonet_device_notify(struct notifier_block *me, unsigned long what,
Jiri Pirko351638e2013-05-28 01:30:21 +0000279 void *ptr)
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700280{
Jiri Pirko351638e2013-05-28 01:30:21 +0000281 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700282
Rémi Denis-Courmontf5bb1c52009-09-09 00:00:05 +0000283 switch (what) {
284 case NETDEV_REGISTER:
285 if (dev->type == ARPHRD_PHONET)
286 phonet_device_autoconf(dev);
287 break;
288 case NETDEV_UNREGISTER:
Rémi Denis-Courmont2be6fa42009-06-24 01:07:45 +0000289 phonet_device_destroy(dev);
Rémi Denis-Courmontf062f412009-10-14 00:48:29 +0000290 phonet_route_autodel(dev);
Rémi Denis-Courmontf5bb1c52009-09-09 00:00:05 +0000291 break;
292 }
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700293 return 0;
294
295}
296
297static struct notifier_block phonet_device_notifier = {
298 .notifier_call = phonet_device_notify,
299 .priority = 0,
300};
301
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000302/* Per-namespace Phonet devices handling */
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000303static int __net_init phonet_init_net(struct net *net)
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000304{
Jiri Pirko0db3f0f2010-04-26 03:41:00 +0000305 struct phonet_net *pnn = phonet_pernet(net);
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000306
Christoph Hellwigc3506372018-04-10 19:42:55 +0200307 if (!proc_create_net("phonet", 0, net->proc_net, &pn_sock_seq_ops,
308 sizeof(struct seq_net_private)))
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000309 return -ENOMEM;
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000310
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000311 INIT_LIST_HEAD(&pnn->pndevs.list);
Rémi Denis-Courmonteeb74a9d2009-11-18 10:08:26 -0800312 mutex_init(&pnn->pndevs.lock);
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000313 mutex_init(&pnn->routes.lock);
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000314 return 0;
315}
316
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000317static void __net_exit phonet_exit_net(struct net *net)
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000318{
Vasily Averinae61e8c2017-11-12 22:32:47 +0300319 struct phonet_net *pnn = phonet_pernet(net);
320
Gao fengece31ff2013-02-18 01:34:56 +0000321 remove_proc_entry("phonet", net->proc_net);
Vasily Averinae61e8c2017-11-12 22:32:47 +0300322 WARN_ON_ONCE(!list_empty(&pnn->pndevs.list));
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000323}
324
325static struct pernet_operations phonet_net_ops = {
326 .init = phonet_init_net,
327 .exit = phonet_exit_net,
Eric W. Biedermand2b3eb62009-11-29 15:46:12 +0000328 .id = &phonet_net_id,
329 .size = sizeof(struct phonet_net),
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000330};
331
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700332/* Initialize Phonet devices list */
remi.denis-courmont@nokia76e02cf2009-01-23 03:00:27 +0000333int __init phonet_device_init(void)
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700334{
Eric W. Biederman03478752012-04-06 15:35:39 +0000335 int err = register_pernet_subsys(&phonet_net_ops);
remi.denis-courmont@nokia9a3b7a42009-01-23 03:00:30 +0000336 if (err)
337 return err;
remi.denis-courmont@nokia660f7062009-01-23 03:00:28 +0000338
Christoph Hellwigc3506372018-04-10 19:42:55 +0200339 proc_create_net("pnresource", 0, init_net.proc_net, &pn_res_seq_ops,
340 sizeof(struct seq_net_private));
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700341 register_netdevice_notifier(&phonet_device_notifier);
remi.denis-courmont@nokia660f7062009-01-23 03:00:28 +0000342 err = phonet_netlink_register();
343 if (err)
344 phonet_device_exit();
345 return err;
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700346}
347
348void phonet_device_exit(void)
349{
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700350 rtnl_unregister_all(PF_PHONET);
remi.denis-courmont@nokia6530e0f2009-01-23 03:00:29 +0000351 unregister_netdevice_notifier(&phonet_device_notifier);
Eric W. Biederman03478752012-04-06 15:35:39 +0000352 unregister_pernet_subsys(&phonet_net_ops);
Gao fengece31ff2013-02-18 01:34:56 +0000353 remove_proc_entry("pnresource", init_net.proc_net);
Remi Denis-Courmontf8ff6022008-09-22 20:03:44 -0700354}
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000355
356int phonet_route_add(struct net_device *dev, u8 daddr)
357{
Jiri Pirko0db3f0f2010-04-26 03:41:00 +0000358 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000359 struct phonet_routes *routes = &pnn->routes;
360 int err = -EEXIST;
361
362 daddr = daddr >> 2;
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000363 mutex_lock(&routes->lock);
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000364 if (routes->table[daddr] == NULL) {
Eric Dumazetcf778b02012-01-12 04:41:32 +0000365 rcu_assign_pointer(routes->table[daddr], dev);
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000366 dev_hold(dev);
367 err = 0;
368 }
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000369 mutex_unlock(&routes->lock);
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000370 return err;
371}
372
373int phonet_route_del(struct net_device *dev, u8 daddr)
374{
Jiri Pirko0db3f0f2010-04-26 03:41:00 +0000375 struct phonet_net *pnn = phonet_pernet(dev_net(dev));
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000376 struct phonet_routes *routes = &pnn->routes;
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000377
378 daddr = daddr >> 2;
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000379 mutex_lock(&routes->lock);
Fabian Frederick79952bc2014-10-06 20:15:20 +0200380 if (rcu_access_pointer(routes->table[daddr]) == dev)
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000381 RCU_INIT_POINTER(routes->table[daddr], NULL);
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000382 else
383 dev = NULL;
384 mutex_unlock(&routes->lock);
385
386 if (!dev)
387 return -ENOENT;
388 synchronize_rcu();
389 dev_put(dev);
390 return 0;
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000391}
392
Eric Dumazete67f88d2011-04-27 22:56:07 +0000393struct net_device *phonet_route_get_rcu(struct net *net, u8 daddr)
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000394{
Jiri Pirko0db3f0f2010-04-26 03:41:00 +0000395 struct phonet_net *pnn = phonet_pernet(net);
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000396 struct phonet_routes *routes = &pnn->routes;
397 struct net_device *dev;
398
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000399 daddr >>= 2;
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000400 dev = rcu_dereference(routes->table[daddr]);
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000401 return dev;
402}
403
404struct net_device *phonet_route_output(struct net *net, u8 daddr)
405{
Jiri Pirko0db3f0f2010-04-26 03:41:00 +0000406 struct phonet_net *pnn = phonet_pernet(net);
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000407 struct phonet_routes *routes = &pnn->routes;
408 struct net_device *dev;
409
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000410 daddr >>= 2;
411 rcu_read_lock();
412 dev = rcu_dereference(routes->table[daddr]);
Yajun Deng1160dfa2021-08-05 19:55:27 +0800413 dev_hold(dev);
Rémi Denis-Courmont88880132009-11-13 05:01:19 +0000414 rcu_read_unlock();
Rémi Denis-Courmont55748ac02009-10-14 00:48:28 +0000415
416 if (!dev)
417 dev = phonet_device_get(net); /* Default route */
418 return dev;
419}