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13#include <linux/gfp.h>
14#include <linux/kernel.h>
15#include <linux/net.h>
16#include <linux/poll.h>
17#include <linux/sched/signal.h>
18
19#include <net/sock.h>
20#include <net/tcp_states.h>
21
22#include <linux/phonet.h>
23#include <linux/export.h>
24#include <net/phonet/phonet.h>
25#include <net/phonet/pep.h>
26#include <net/phonet/pn_dev.h>
27
28static int pn_socket_release(struct socket *sock)
29{
30 struct sock *sk = sock->sk;
31
32 if (sk) {
33 sock->sk = NULL;
34 sk->sk_prot->close(sk, 0);
35 }
36 return 0;
37}
38
39#define PN_HASHSIZE 16
40#define PN_HASHMASK (PN_HASHSIZE-1)
41
42
43static struct {
44 struct hlist_head hlist[PN_HASHSIZE];
45 struct mutex lock;
46} pnsocks;
47
48void __init pn_sock_init(void)
49{
50 unsigned int i;
51
52 for (i = 0; i < PN_HASHSIZE; i++)
53 INIT_HLIST_HEAD(pnsocks.hlist + i);
54 mutex_init(&pnsocks.lock);
55}
56
57static struct hlist_head *pn_hash_list(u16 obj)
58{
59 return pnsocks.hlist + (obj & PN_HASHMASK);
60}
61
62
63
64
65
66struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
67{
68 struct sock *sknode;
69 struct sock *rval = NULL;
70 u16 obj = pn_sockaddr_get_object(spn);
71 u8 res = spn->spn_resource;
72 struct hlist_head *hlist = pn_hash_list(obj);
73
74 rcu_read_lock();
75 sk_for_each_rcu(sknode, hlist) {
76 struct pn_sock *pn = pn_sk(sknode);
77 BUG_ON(!pn->sobject);
78
79 if (!net_eq(sock_net(sknode), net))
80 continue;
81 if (pn_port(obj)) {
82
83 if (pn_port(pn->sobject) != pn_port(obj))
84 continue;
85 } else {
86
87 if (pn->resource != res)
88 continue;
89 }
90 if (pn_addr(pn->sobject) &&
91 pn_addr(pn->sobject) != pn_addr(obj))
92 continue;
93
94 rval = sknode;
95 sock_hold(sknode);
96 break;
97 }
98 rcu_read_unlock();
99
100 return rval;
101}
102
103
104void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
105{
106 struct hlist_head *hlist = pnsocks.hlist;
107 unsigned int h;
108
109 rcu_read_lock();
110 for (h = 0; h < PN_HASHSIZE; h++) {
111 struct sock *sknode;
112
113 sk_for_each(sknode, hlist) {
114 struct sk_buff *clone;
115
116 if (!net_eq(sock_net(sknode), net))
117 continue;
118 if (!sock_flag(sknode, SOCK_BROADCAST))
119 continue;
120
121 clone = skb_clone(skb, GFP_ATOMIC);
122 if (clone) {
123 sock_hold(sknode);
124 sk_receive_skb(sknode, clone, 0);
125 }
126 }
127 hlist++;
128 }
129 rcu_read_unlock();
130}
131
132int pn_sock_hash(struct sock *sk)
133{
134 struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
135
136 mutex_lock(&pnsocks.lock);
137 sk_add_node_rcu(sk, hlist);
138 mutex_unlock(&pnsocks.lock);
139
140 return 0;
141}
142EXPORT_SYMBOL(pn_sock_hash);
143
144void pn_sock_unhash(struct sock *sk)
145{
146 mutex_lock(&pnsocks.lock);
147 sk_del_node_init_rcu(sk);
148 mutex_unlock(&pnsocks.lock);
149 pn_sock_unbind_all_res(sk);
150 synchronize_rcu();
151}
152EXPORT_SYMBOL(pn_sock_unhash);
153
154static DEFINE_MUTEX(port_mutex);
155
156static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len)
157{
158 struct sock *sk = sock->sk;
159 struct pn_sock *pn = pn_sk(sk);
160 struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
161 int err;
162 u16 handle;
163 u8 saddr;
164
165 if (sk->sk_prot->bind)
166 return sk->sk_prot->bind(sk, addr, len);
167
168 if (len < sizeof(struct sockaddr_pn))
169 return -EINVAL;
170 if (spn->spn_family != AF_PHONET)
171 return -EAFNOSUPPORT;
172
173 handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
174 saddr = pn_addr(handle);
175 if (saddr && phonet_address_lookup(sock_net(sk), saddr))
176 return -EADDRNOTAVAIL;
177
178 lock_sock(sk);
179 if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) {
180 err = -EINVAL;
181 goto out;
182 }
183 WARN_ON(sk_hashed(sk));
184 mutex_lock(&port_mutex);
185 err = sk->sk_prot->get_port(sk, pn_port(handle));
186 if (err)
187 goto out_port;
188
189
190 pn->sobject = pn_object(saddr, pn_port(pn->sobject));
191 pn->resource = spn->spn_resource;
192
193
194 err = sk->sk_prot->hash(sk);
195out_port:
196 mutex_unlock(&port_mutex);
197out:
198 release_sock(sk);
199 return err;
200}
201
202static int pn_socket_autobind(struct socket *sock)
203{
204 struct sockaddr_pn sa;
205 int err;
206
207 memset(&sa, 0, sizeof(sa));
208 sa.spn_family = AF_PHONET;
209 err = pn_socket_bind(sock, (struct sockaddr *)&sa,
210 sizeof(struct sockaddr_pn));
211 if (err != -EINVAL)
212 return err;
213 BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
214 return 0;
215}
216
217static int pn_socket_connect(struct socket *sock, struct sockaddr *addr,
218 int len, int flags)
219{
220 struct sock *sk = sock->sk;
221 struct pn_sock *pn = pn_sk(sk);
222 struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
223 struct task_struct *tsk = current;
224 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
225 int err;
226
227 if (pn_socket_autobind(sock))
228 return -ENOBUFS;
229 if (len < sizeof(struct sockaddr_pn))
230 return -EINVAL;
231 if (spn->spn_family != AF_PHONET)
232 return -EAFNOSUPPORT;
233
234 lock_sock(sk);
235
236 switch (sock->state) {
237 case SS_UNCONNECTED:
238 if (sk->sk_state != TCP_CLOSE) {
239 err = -EISCONN;
240 goto out;
241 }
242 break;
243 case SS_CONNECTING:
244 err = -EALREADY;
245 goto out;
246 default:
247 err = -EISCONN;
248 goto out;
249 }
250
251 pn->dobject = pn_sockaddr_get_object(spn);
252 pn->resource = pn_sockaddr_get_resource(spn);
253 sock->state = SS_CONNECTING;
254
255 err = sk->sk_prot->connect(sk, addr, len);
256 if (err) {
257 sock->state = SS_UNCONNECTED;
258 pn->dobject = 0;
259 goto out;
260 }
261
262 while (sk->sk_state == TCP_SYN_SENT) {
263 DEFINE_WAIT(wait);
264
265 if (!timeo) {
266 err = -EINPROGRESS;
267 goto out;
268 }
269 if (signal_pending(tsk)) {
270 err = sock_intr_errno(timeo);
271 goto out;
272 }
273
274 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
275 TASK_INTERRUPTIBLE);
276 release_sock(sk);
277 timeo = schedule_timeout(timeo);
278 lock_sock(sk);
279 finish_wait(sk_sleep(sk), &wait);
280 }
281
282 if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED))
283 err = 0;
284 else if (sk->sk_state == TCP_CLOSE_WAIT)
285 err = -ECONNRESET;
286 else
287 err = -ECONNREFUSED;
288 sock->state = err ? SS_UNCONNECTED : SS_CONNECTED;
289out:
290 release_sock(sk);
291 return err;
292}
293
294static int pn_socket_accept(struct socket *sock, struct socket *newsock,
295 int flags, bool kern)
296{
297 struct sock *sk = sock->sk;
298 struct sock *newsk;
299 int err;
300
301 if (unlikely(sk->sk_state != TCP_LISTEN))
302 return -EINVAL;
303
304 newsk = sk->sk_prot->accept(sk, flags, &err, kern);
305 if (!newsk)
306 return err;
307
308 lock_sock(newsk);
309 sock_graft(newsk, newsock);
310 newsock->state = SS_CONNECTED;
311 release_sock(newsk);
312 return 0;
313}
314
315static int pn_socket_getname(struct socket *sock, struct sockaddr *addr,
316 int peer)
317{
318 struct sock *sk = sock->sk;
319 struct pn_sock *pn = pn_sk(sk);
320
321 memset(addr, 0, sizeof(struct sockaddr_pn));
322 addr->sa_family = AF_PHONET;
323 if (!peer)
324 pn_sockaddr_set_object((struct sockaddr_pn *)addr,
325 pn->sobject);
326
327 return sizeof(struct sockaddr_pn);
328}
329
330static __poll_t pn_socket_poll(struct file *file, struct socket *sock,
331 poll_table *wait)
332{
333 struct sock *sk = sock->sk;
334 struct pep_sock *pn = pep_sk(sk);
335 __poll_t mask = 0;
336
337 poll_wait(file, sk_sleep(sk), wait);
338
339 if (sk->sk_state == TCP_CLOSE)
340 return EPOLLERR;
341 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
342 mask |= EPOLLIN | EPOLLRDNORM;
343 if (!skb_queue_empty_lockless(&pn->ctrlreq_queue))
344 mask |= EPOLLPRI;
345 if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
346 return EPOLLHUP;
347
348 if (sk->sk_state == TCP_ESTABLISHED &&
349 refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
350 atomic_read(&pn->tx_credits))
351 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
352
353 return mask;
354}
355
356static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
357 unsigned long arg)
358{
359 struct sock *sk = sock->sk;
360 struct pn_sock *pn = pn_sk(sk);
361
362 if (cmd == SIOCPNGETOBJECT) {
363 struct net_device *dev;
364 u16 handle;
365 u8 saddr;
366
367 if (get_user(handle, (__u16 __user *)arg))
368 return -EFAULT;
369
370 lock_sock(sk);
371 if (sk->sk_bound_dev_if)
372 dev = dev_get_by_index(sock_net(sk),
373 sk->sk_bound_dev_if);
374 else
375 dev = phonet_device_get(sock_net(sk));
376 if (dev && (dev->flags & IFF_UP))
377 saddr = phonet_address_get(dev, pn_addr(handle));
378 else
379 saddr = PN_NO_ADDR;
380 release_sock(sk);
381
382 dev_put(dev);
383 if (saddr == PN_NO_ADDR)
384 return -EHOSTUNREACH;
385
386 handle = pn_object(saddr, pn_port(pn->sobject));
387 return put_user(handle, (__u16 __user *)arg);
388 }
389
390 return sk->sk_prot->ioctl(sk, cmd, arg);
391}
392
393static int pn_socket_listen(struct socket *sock, int backlog)
394{
395 struct sock *sk = sock->sk;
396 int err = 0;
397
398 if (pn_socket_autobind(sock))
399 return -ENOBUFS;
400
401 lock_sock(sk);
402 if (sock->state != SS_UNCONNECTED) {
403 err = -EINVAL;
404 goto out;
405 }
406
407 if (sk->sk_state != TCP_LISTEN) {
408 sk->sk_state = TCP_LISTEN;
409 sk->sk_ack_backlog = 0;
410 }
411 sk->sk_max_ack_backlog = backlog;
412out:
413 release_sock(sk);
414 return err;
415}
416
417static int pn_socket_sendmsg(struct socket *sock, struct msghdr *m,
418 size_t total_len)
419{
420 struct sock *sk = sock->sk;
421
422 if (pn_socket_autobind(sock))
423 return -EAGAIN;
424
425 return sk->sk_prot->sendmsg(sk, m, total_len);
426}
427
428const struct proto_ops phonet_dgram_ops = {
429 .family = AF_PHONET,
430 .owner = THIS_MODULE,
431 .release = pn_socket_release,
432 .bind = pn_socket_bind,
433 .connect = sock_no_connect,
434 .socketpair = sock_no_socketpair,
435 .accept = sock_no_accept,
436 .getname = pn_socket_getname,
437 .poll = datagram_poll,
438 .ioctl = pn_socket_ioctl,
439 .listen = sock_no_listen,
440 .shutdown = sock_no_shutdown,
441 .sendmsg = pn_socket_sendmsg,
442 .recvmsg = sock_common_recvmsg,
443 .mmap = sock_no_mmap,
444 .sendpage = sock_no_sendpage,
445};
446
447const struct proto_ops phonet_stream_ops = {
448 .family = AF_PHONET,
449 .owner = THIS_MODULE,
450 .release = pn_socket_release,
451 .bind = pn_socket_bind,
452 .connect = pn_socket_connect,
453 .socketpair = sock_no_socketpair,
454 .accept = pn_socket_accept,
455 .getname = pn_socket_getname,
456 .poll = pn_socket_poll,
457 .ioctl = pn_socket_ioctl,
458 .listen = pn_socket_listen,
459 .shutdown = sock_no_shutdown,
460 .setsockopt = sock_common_setsockopt,
461 .getsockopt = sock_common_getsockopt,
462 .sendmsg = pn_socket_sendmsg,
463 .recvmsg = sock_common_recvmsg,
464 .mmap = sock_no_mmap,
465 .sendpage = sock_no_sendpage,
466};
467EXPORT_SYMBOL(phonet_stream_ops);
468
469
470int pn_sock_get_port(struct sock *sk, unsigned short sport)
471{
472 static int port_cur;
473 struct net *net = sock_net(sk);
474 struct pn_sock *pn = pn_sk(sk);
475 struct sockaddr_pn try_sa;
476 struct sock *tmpsk;
477
478 memset(&try_sa, 0, sizeof(struct sockaddr_pn));
479 try_sa.spn_family = AF_PHONET;
480 WARN_ON(!mutex_is_locked(&port_mutex));
481 if (!sport) {
482
483 int port, pmin, pmax;
484
485 phonet_get_local_port_range(&pmin, &pmax);
486 for (port = pmin; port <= pmax; port++) {
487 port_cur++;
488 if (port_cur < pmin || port_cur > pmax)
489 port_cur = pmin;
490
491 pn_sockaddr_set_port(&try_sa, port_cur);
492 tmpsk = pn_find_sock_by_sa(net, &try_sa);
493 if (tmpsk == NULL) {
494 sport = port_cur;
495 goto found;
496 } else
497 sock_put(tmpsk);
498 }
499 } else {
500
501 pn_sockaddr_set_port(&try_sa, sport);
502 tmpsk = pn_find_sock_by_sa(net, &try_sa);
503 if (tmpsk == NULL)
504
505 goto found;
506 else
507 sock_put(tmpsk);
508 }
509
510 return -EADDRINUSE;
511
512found:
513 pn->sobject = pn_object(pn_addr(pn->sobject), sport);
514 return 0;
515}
516EXPORT_SYMBOL(pn_sock_get_port);
517
518#ifdef CONFIG_PROC_FS
519static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)
520{
521 struct net *net = seq_file_net(seq);
522 struct hlist_head *hlist = pnsocks.hlist;
523 struct sock *sknode;
524 unsigned int h;
525
526 for (h = 0; h < PN_HASHSIZE; h++) {
527 sk_for_each_rcu(sknode, hlist) {
528 if (!net_eq(net, sock_net(sknode)))
529 continue;
530 if (!pos)
531 return sknode;
532 pos--;
533 }
534 hlist++;
535 }
536 return NULL;
537}
538
539static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk)
540{
541 struct net *net = seq_file_net(seq);
542
543 do
544 sk = sk_next(sk);
545 while (sk && !net_eq(net, sock_net(sk)));
546
547 return sk;
548}
549
550static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos)
551 __acquires(rcu)
552{
553 rcu_read_lock();
554 return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
555}
556
557static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos)
558{
559 struct sock *sk;
560
561 if (v == SEQ_START_TOKEN)
562 sk = pn_sock_get_idx(seq, 0);
563 else
564 sk = pn_sock_get_next(seq, v);
565 (*pos)++;
566 return sk;
567}
568
569static void pn_sock_seq_stop(struct seq_file *seq, void *v)
570 __releases(rcu)
571{
572 rcu_read_unlock();
573}
574
575static int pn_sock_seq_show(struct seq_file *seq, void *v)
576{
577 seq_setwidth(seq, 127);
578 if (v == SEQ_START_TOKEN)
579 seq_puts(seq, "pt loc rem rs st tx_queue rx_queue "
580 " uid inode ref pointer drops");
581 else {
582 struct sock *sk = v;
583 struct pn_sock *pn = pn_sk(sk);
584
585 seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
586 "%d %pK %u",
587 sk->sk_protocol, pn->sobject, pn->dobject,
588 pn->resource, sk->sk_state,
589 sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
590 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
591 sock_i_ino(sk),
592 refcount_read(&sk->sk_refcnt), sk,
593 atomic_read(&sk->sk_drops));
594 }
595 seq_pad(seq, '\n');
596 return 0;
597}
598
599const struct seq_operations pn_sock_seq_ops = {
600 .start = pn_sock_seq_start,
601 .next = pn_sock_seq_next,
602 .stop = pn_sock_seq_stop,
603 .show = pn_sock_seq_show,
604};
605#endif
606
607static struct {
608 struct sock *sk[256];
609} pnres;
610
611
612
613
614struct sock *pn_find_sock_by_res(struct net *net, u8 res)
615{
616 struct sock *sk;
617
618 if (!net_eq(net, &init_net))
619 return NULL;
620
621 rcu_read_lock();
622 sk = rcu_dereference(pnres.sk[res]);
623 if (sk)
624 sock_hold(sk);
625 rcu_read_unlock();
626 return sk;
627}
628
629static DEFINE_MUTEX(resource_mutex);
630
631int pn_sock_bind_res(struct sock *sk, u8 res)
632{
633 int ret = -EADDRINUSE;
634
635 if (!net_eq(sock_net(sk), &init_net))
636 return -ENOIOCTLCMD;
637 if (!capable(CAP_SYS_ADMIN))
638 return -EPERM;
639 if (pn_socket_autobind(sk->sk_socket))
640 return -EAGAIN;
641
642 mutex_lock(&resource_mutex);
643 if (pnres.sk[res] == NULL) {
644 sock_hold(sk);
645 rcu_assign_pointer(pnres.sk[res], sk);
646 ret = 0;
647 }
648 mutex_unlock(&resource_mutex);
649 return ret;
650}
651
652int pn_sock_unbind_res(struct sock *sk, u8 res)
653{
654 int ret = -ENOENT;
655
656 if (!capable(CAP_SYS_ADMIN))
657 return -EPERM;
658
659 mutex_lock(&resource_mutex);
660 if (pnres.sk[res] == sk) {
661 RCU_INIT_POINTER(pnres.sk[res], NULL);
662 ret = 0;
663 }
664 mutex_unlock(&resource_mutex);
665
666 if (ret == 0) {
667 synchronize_rcu();
668 sock_put(sk);
669 }
670 return ret;
671}
672
673void pn_sock_unbind_all_res(struct sock *sk)
674{
675 unsigned int res, match = 0;
676
677 mutex_lock(&resource_mutex);
678 for (res = 0; res < 256; res++) {
679 if (pnres.sk[res] == sk) {
680 RCU_INIT_POINTER(pnres.sk[res], NULL);
681 match++;
682 }
683 }
684 mutex_unlock(&resource_mutex);
685
686 while (match > 0) {
687 __sock_put(sk);
688 match--;
689 }
690
691}
692
693#ifdef CONFIG_PROC_FS
694static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos)
695{
696 struct net *net = seq_file_net(seq);
697 unsigned int i;
698
699 if (!net_eq(net, &init_net))
700 return NULL;
701
702 for (i = 0; i < 256; i++) {
703 if (pnres.sk[i] == NULL)
704 continue;
705 if (!pos)
706 return pnres.sk + i;
707 pos--;
708 }
709 return NULL;
710}
711
712static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk)
713{
714 struct net *net = seq_file_net(seq);
715 unsigned int i;
716
717 BUG_ON(!net_eq(net, &init_net));
718
719 for (i = (sk - pnres.sk) + 1; i < 256; i++)
720 if (pnres.sk[i])
721 return pnres.sk + i;
722 return NULL;
723}
724
725static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos)
726 __acquires(resource_mutex)
727{
728 mutex_lock(&resource_mutex);
729 return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
730}
731
732static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos)
733{
734 struct sock **sk;
735
736 if (v == SEQ_START_TOKEN)
737 sk = pn_res_get_idx(seq, 0);
738 else
739 sk = pn_res_get_next(seq, v);
740 (*pos)++;
741 return sk;
742}
743
744static void pn_res_seq_stop(struct seq_file *seq, void *v)
745 __releases(resource_mutex)
746{
747 mutex_unlock(&resource_mutex);
748}
749
750static int pn_res_seq_show(struct seq_file *seq, void *v)
751{
752 seq_setwidth(seq, 63);
753 if (v == SEQ_START_TOKEN)
754 seq_puts(seq, "rs uid inode");
755 else {
756 struct sock **psk = v;
757 struct sock *sk = *psk;
758
759 seq_printf(seq, "%02X %5u %lu",
760 (int) (psk - pnres.sk),
761 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
762 sock_i_ino(sk));
763 }
764 seq_pad(seq, '\n');
765 return 0;
766}
767
768const struct seq_operations pn_res_seq_ops = {
769 .start = pn_res_seq_start,
770 .next = pn_res_seq_next,
771 .stop = pn_res_seq_stop,
772 .show = pn_res_seq_show,
773};
774#endif
775
