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9#include <linux/if_link.h>
10#include <linux/mctp.h>
11#include <linux/netdevice.h>
12#include <linux/rcupdate.h>
13#include <linux/rtnetlink.h>
14
15#include <net/addrconf.h>
16#include <net/netlink.h>
17#include <net/mctp.h>
18#include <net/mctpdevice.h>
19#include <net/sock.h>
20
21struct mctp_dump_cb {
22 int h;
23 int idx;
24 size_t a_idx;
25};
26
27
28struct mctp_dev *__mctp_dev_get(const struct net_device *dev)
29{
30 return rcu_dereference(dev->mctp_ptr);
31}
32
33struct mctp_dev *mctp_dev_get_rtnl(const struct net_device *dev)
34{
35 return rtnl_dereference(dev->mctp_ptr);
36}
37
38static int mctp_fill_addrinfo(struct sk_buff *skb, struct netlink_callback *cb,
39 struct mctp_dev *mdev, mctp_eid_t eid)
40{
41 struct ifaddrmsg *hdr;
42 struct nlmsghdr *nlh;
43
44 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
45 RTM_NEWADDR, sizeof(*hdr), NLM_F_MULTI);
46 if (!nlh)
47 return -EMSGSIZE;
48
49 hdr = nlmsg_data(nlh);
50 hdr->ifa_family = AF_MCTP;
51 hdr->ifa_prefixlen = 0;
52 hdr->ifa_flags = 0;
53 hdr->ifa_scope = 0;
54 hdr->ifa_index = mdev->dev->ifindex;
55
56 if (nla_put_u8(skb, IFA_LOCAL, eid))
57 goto cancel;
58
59 if (nla_put_u8(skb, IFA_ADDRESS, eid))
60 goto cancel;
61
62 nlmsg_end(skb, nlh);
63
64 return 0;
65
66cancel:
67 nlmsg_cancel(skb, nlh);
68 return -EMSGSIZE;
69}
70
71static int mctp_dump_dev_addrinfo(struct mctp_dev *mdev, struct sk_buff *skb,
72 struct netlink_callback *cb)
73{
74 struct mctp_dump_cb *mcb = (void *)cb->ctx;
75 int rc = 0;
76
77 for (; mcb->a_idx < mdev->num_addrs; mcb->a_idx++) {
78 rc = mctp_fill_addrinfo(skb, cb, mdev, mdev->addrs[mcb->a_idx]);
79 if (rc < 0)
80 break;
81 }
82
83 return rc;
84}
85
86static int mctp_dump_addrinfo(struct sk_buff *skb, struct netlink_callback *cb)
87{
88 struct mctp_dump_cb *mcb = (void *)cb->ctx;
89 struct net *net = sock_net(skb->sk);
90 struct hlist_head *head;
91 struct net_device *dev;
92 struct ifaddrmsg *hdr;
93 struct mctp_dev *mdev;
94 int ifindex;
95 int idx, rc;
96
97 hdr = nlmsg_data(cb->nlh);
98
99 ifindex = hdr->ifa_index;
100
101 rcu_read_lock();
102 for (; mcb->h < NETDEV_HASHENTRIES; mcb->h++, mcb->idx = 0) {
103 idx = 0;
104 head = &net->dev_index_head[mcb->h];
105 hlist_for_each_entry_rcu(dev, head, index_hlist) {
106 if (idx >= mcb->idx &&
107 (ifindex == 0 || ifindex == dev->ifindex)) {
108 mdev = __mctp_dev_get(dev);
109 if (mdev) {
110 rc = mctp_dump_dev_addrinfo(mdev,
111 skb, cb);
112
113
114 if (rc < 0)
115 goto out;
116 }
117 }
118 idx++;
119
120 mcb->a_idx = 0;
121 }
122 }
123out:
124 rcu_read_unlock();
125 mcb->idx = idx;
126
127 return skb->len;
128}
129
130static const struct nla_policy ifa_mctp_policy[IFA_MAX + 1] = {
131 [IFA_ADDRESS] = { .type = NLA_U8 },
132 [IFA_LOCAL] = { .type = NLA_U8 },
133};
134
135static int mctp_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
136 struct netlink_ext_ack *extack)
137{
138 struct net *net = sock_net(skb->sk);
139 struct nlattr *tb[IFA_MAX + 1];
140 struct net_device *dev;
141 struct mctp_addr *addr;
142 struct mctp_dev *mdev;
143 struct ifaddrmsg *ifm;
144 unsigned long flags;
145 u8 *tmp_addrs;
146 int rc;
147
148 rc = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_mctp_policy,
149 extack);
150 if (rc < 0)
151 return rc;
152
153 ifm = nlmsg_data(nlh);
154
155 if (tb[IFA_LOCAL])
156 addr = nla_data(tb[IFA_LOCAL]);
157 else if (tb[IFA_ADDRESS])
158 addr = nla_data(tb[IFA_ADDRESS]);
159 else
160 return -EINVAL;
161
162
163 dev = __dev_get_by_index(net, ifm->ifa_index);
164 if (!dev)
165 return -ENODEV;
166
167 mdev = mctp_dev_get_rtnl(dev);
168 if (!mdev)
169 return -ENODEV;
170
171 if (!mctp_address_ok(addr->s_addr))
172 return -EINVAL;
173
174
175 if (memchr(mdev->addrs, addr->s_addr, mdev->num_addrs))
176 return -EEXIST;
177
178 tmp_addrs = kmalloc(mdev->num_addrs + 1, GFP_KERNEL);
179 if (!tmp_addrs)
180 return -ENOMEM;
181 memcpy(tmp_addrs, mdev->addrs, mdev->num_addrs);
182 tmp_addrs[mdev->num_addrs] = addr->s_addr;
183
184
185 spin_lock_irqsave(&mdev->addrs_lock, flags);
186 mdev->num_addrs++;
187 swap(mdev->addrs, tmp_addrs);
188 spin_unlock_irqrestore(&mdev->addrs_lock, flags);
189
190 kfree(tmp_addrs);
191
192 mctp_route_add_local(mdev, addr->s_addr);
193
194 return 0;
195}
196
197static int mctp_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
198 struct netlink_ext_ack *extack)
199{
200 struct net *net = sock_net(skb->sk);
201 struct nlattr *tb[IFA_MAX + 1];
202 struct net_device *dev;
203 struct mctp_addr *addr;
204 struct mctp_dev *mdev;
205 struct ifaddrmsg *ifm;
206 unsigned long flags;
207 u8 *pos;
208 int rc;
209
210 rc = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_mctp_policy,
211 extack);
212 if (rc < 0)
213 return rc;
214
215 ifm = nlmsg_data(nlh);
216
217 if (tb[IFA_LOCAL])
218 addr = nla_data(tb[IFA_LOCAL]);
219 else if (tb[IFA_ADDRESS])
220 addr = nla_data(tb[IFA_ADDRESS]);
221 else
222 return -EINVAL;
223
224
225 dev = __dev_get_by_index(net, ifm->ifa_index);
226 if (!dev)
227 return -ENODEV;
228
229 mdev = mctp_dev_get_rtnl(dev);
230 if (!mdev)
231 return -ENODEV;
232
233 pos = memchr(mdev->addrs, addr->s_addr, mdev->num_addrs);
234 if (!pos)
235 return -ENOENT;
236
237 rc = mctp_route_remove_local(mdev, addr->s_addr);
238
239 if (rc < 0 && rc != -ENOENT)
240 return rc;
241
242 spin_lock_irqsave(&mdev->addrs_lock, flags);
243 memmove(pos, pos + 1, mdev->num_addrs - 1 - (pos - mdev->addrs));
244 mdev->num_addrs--;
245 spin_unlock_irqrestore(&mdev->addrs_lock, flags);
246
247 return 0;
248}
249
250void mctp_dev_hold(struct mctp_dev *mdev)
251{
252 refcount_inc(&mdev->refs);
253}
254
255void mctp_dev_put(struct mctp_dev *mdev)
256{
257 if (refcount_dec_and_test(&mdev->refs)) {
258 dev_put(mdev->dev);
259 kfree_rcu(mdev, rcu);
260 }
261}
262
263void mctp_dev_release_key(struct mctp_dev *dev, struct mctp_sk_key *key)
264 __must_hold(&key->lock)
265{
266 if (!dev)
267 return;
268 if (dev->ops && dev->ops->release_flow)
269 dev->ops->release_flow(dev, key);
270 key->dev = NULL;
271 mctp_dev_put(dev);
272}
273
274void mctp_dev_set_key(struct mctp_dev *dev, struct mctp_sk_key *key)
275 __must_hold(&key->lock)
276{
277 mctp_dev_hold(dev);
278 key->dev = dev;
279}
280
281static struct mctp_dev *mctp_add_dev(struct net_device *dev)
282{
283 struct mctp_dev *mdev;
284
285 ASSERT_RTNL();
286
287 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
288 if (!mdev)
289 return ERR_PTR(-ENOMEM);
290
291 spin_lock_init(&mdev->addrs_lock);
292
293 mdev->net = mctp_default_net(dev_net(dev));
294
295
296 refcount_set(&mdev->refs, 1);
297 rcu_assign_pointer(dev->mctp_ptr, mdev);
298
299 dev_hold(dev);
300 mdev->dev = dev;
301
302 return mdev;
303}
304
305static int mctp_fill_link_af(struct sk_buff *skb,
306 const struct net_device *dev, u32 ext_filter_mask)
307{
308 struct mctp_dev *mdev;
309
310 mdev = mctp_dev_get_rtnl(dev);
311 if (!mdev)
312 return -ENODATA;
313 if (nla_put_u32(skb, IFLA_MCTP_NET, mdev->net))
314 return -EMSGSIZE;
315 return 0;
316}
317
318static size_t mctp_get_link_af_size(const struct net_device *dev,
319 u32 ext_filter_mask)
320{
321 struct mctp_dev *mdev;
322 unsigned int ret;
323
324
325 mdev = __mctp_dev_get(dev);
326 if (!mdev)
327 return 0;
328 ret = nla_total_size(4);
329 return ret;
330}
331
332static const struct nla_policy ifla_af_mctp_policy[IFLA_MCTP_MAX + 1] = {
333 [IFLA_MCTP_NET] = { .type = NLA_U32 },
334};
335
336static int mctp_set_link_af(struct net_device *dev, const struct nlattr *attr,
337 struct netlink_ext_ack *extack)
338{
339 struct nlattr *tb[IFLA_MCTP_MAX + 1];
340 struct mctp_dev *mdev;
341 int rc;
342
343 rc = nla_parse_nested(tb, IFLA_MCTP_MAX, attr, ifla_af_mctp_policy,
344 NULL);
345 if (rc)
346 return rc;
347
348 mdev = mctp_dev_get_rtnl(dev);
349 if (!mdev)
350 return 0;
351
352 if (tb[IFLA_MCTP_NET])
353 WRITE_ONCE(mdev->net, nla_get_u32(tb[IFLA_MCTP_NET]));
354
355 return 0;
356}
357
358
359static bool mctp_known(struct net_device *dev)
360{
361
362 return dev->type == ARPHRD_MCTP ||
363 dev->type == ARPHRD_LOOPBACK ||
364 dev->type == ARPHRD_NONE;
365}
366
367static void mctp_unregister(struct net_device *dev)
368{
369 struct mctp_dev *mdev;
370
371 mdev = mctp_dev_get_rtnl(dev);
372 if (mctp_known(dev) != (bool)mdev) {
373
374 netdev_warn(dev, "%s: mdev pointer %d but type (%d) match is %d",
375 __func__, (bool)mdev, mctp_known(dev), dev->type);
376 return;
377 }
378 if (!mdev)
379 return;
380
381 RCU_INIT_POINTER(mdev->dev->mctp_ptr, NULL);
382
383 mctp_route_remove_dev(mdev);
384 mctp_neigh_remove_dev(mdev);
385 kfree(mdev->addrs);
386
387 mctp_dev_put(mdev);
388}
389
390static int mctp_register(struct net_device *dev)
391{
392 struct mctp_dev *mdev;
393
394
395 mdev = rtnl_dereference(dev->mctp_ptr);
396
397 if (mdev) {
398 if (!mctp_known(dev))
399 netdev_warn(dev, "%s: mctp_dev set for unknown type %d",
400 __func__, dev->type);
401 return 0;
402 }
403
404
405 if (!mctp_known(dev))
406 return 0;
407
408 mdev = mctp_add_dev(dev);
409 if (IS_ERR(mdev))
410 return PTR_ERR(mdev);
411
412 return 0;
413}
414
415static int mctp_dev_notify(struct notifier_block *this, unsigned long event,
416 void *ptr)
417{
418 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
419 int rc;
420
421 switch (event) {
422 case NETDEV_REGISTER:
423 rc = mctp_register(dev);
424 if (rc)
425 return notifier_from_errno(rc);
426 break;
427 case NETDEV_UNREGISTER:
428 mctp_unregister(dev);
429 break;
430 }
431
432 return NOTIFY_OK;
433}
434
435static int mctp_register_netdevice(struct net_device *dev,
436 const struct mctp_netdev_ops *ops)
437{
438 struct mctp_dev *mdev;
439
440 mdev = mctp_add_dev(dev);
441 if (IS_ERR(mdev))
442 return PTR_ERR(mdev);
443
444 mdev->ops = ops;
445
446 return register_netdevice(dev);
447}
448
449int mctp_register_netdev(struct net_device *dev,
450 const struct mctp_netdev_ops *ops)
451{
452 int rc;
453
454 rtnl_lock();
455 rc = mctp_register_netdevice(dev, ops);
456 rtnl_unlock();
457
458 return rc;
459}
460EXPORT_SYMBOL_GPL(mctp_register_netdev);
461
462void mctp_unregister_netdev(struct net_device *dev)
463{
464 unregister_netdev(dev);
465}
466EXPORT_SYMBOL_GPL(mctp_unregister_netdev);
467
468static struct rtnl_af_ops mctp_af_ops = {
469 .family = AF_MCTP,
470 .fill_link_af = mctp_fill_link_af,
471 .get_link_af_size = mctp_get_link_af_size,
472 .set_link_af = mctp_set_link_af,
473};
474
475static struct notifier_block mctp_dev_nb = {
476 .notifier_call = mctp_dev_notify,
477 .priority = ADDRCONF_NOTIFY_PRIORITY,
478};
479
480void __init mctp_device_init(void)
481{
482 register_netdevice_notifier(&mctp_dev_nb);
483
484 rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_GETADDR,
485 NULL, mctp_dump_addrinfo, 0);
486 rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_NEWADDR,
487 mctp_rtm_newaddr, NULL, 0);
488 rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_DELADDR,
489 mctp_rtm_deladdr, NULL, 0);
490 rtnl_af_register(&mctp_af_ops);
491}
492
493void __exit mctp_device_exit(void)
494{
495 rtnl_af_unregister(&mctp_af_ops);
496 rtnl_unregister(PF_MCTP, RTM_DELADDR);
497 rtnl_unregister(PF_MCTP, RTM_NEWADDR);
498 rtnl_unregister(PF_MCTP, RTM_GETADDR);
499
500 unregister_netdevice_notifier(&mctp_dev_nb);
501}
502
