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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * File: socket.c
4 *
5 * Phonet sockets
6 *
7 * Copyright (C) 2008 Nokia Corporation.
8 *
9 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
10 * Rémi Denis-Courmont
11 */
12
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 * Find address based on socket address, match only certain fields.
64 * Also grab sock if it was found. Remember to sock_put it later.
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); /* unbound socket */
78
79 if (!net_eq(sock_net(sknode), net))
80 continue;
81 if (pn_port(obj)) {
82 /* Look up socket by port */
83 if (pn_port(pn->sobject) != pn_port(obj))
84 continue;
85 } else {
86 /* If port is zero, look up by resource */
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/* Deliver a broadcast packet (only in bottom-half) */
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; /* attempt to rebind */
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 /* get_port() sets the port, bind() sets the address if applicable */
190 pn->sobject = pn_object(saddr, pn_port(pn->sobject));
191 pn->resource = spn->spn_resource;
192
193 /* Enable RX on the socket */
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; /* socket was already bound */
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) /* Race with bind() here is userland's problem. */
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_ioctl(sk, cmd, (void __user *)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};
445
446const struct proto_ops phonet_stream_ops = {
447 .family = AF_PHONET,
448 .owner = THIS_MODULE,
449 .release = pn_socket_release,
450 .bind = pn_socket_bind,
451 .connect = pn_socket_connect,
452 .socketpair = sock_no_socketpair,
453 .accept = pn_socket_accept,
454 .getname = pn_socket_getname,
455 .poll = pn_socket_poll,
456 .ioctl = pn_socket_ioctl,
457 .listen = pn_socket_listen,
458 .shutdown = sock_no_shutdown,
459 .setsockopt = sock_common_setsockopt,
460 .getsockopt = sock_common_getsockopt,
461 .sendmsg = pn_socket_sendmsg,
462 .recvmsg = sock_common_recvmsg,
463 .mmap = sock_no_mmap,
464};
465EXPORT_SYMBOL(phonet_stream_ops);
466
467/* allocate port for a socket */
468int pn_sock_get_port(struct sock *sk, unsigned short sport)
469{
470 static int port_cur;
471 struct net *net = sock_net(sk);
472 struct pn_sock *pn = pn_sk(sk);
473 struct sockaddr_pn try_sa;
474 struct sock *tmpsk;
475
476 memset(&try_sa, 0, sizeof(struct sockaddr_pn));
477 try_sa.spn_family = AF_PHONET;
478 WARN_ON(!mutex_is_locked(&port_mutex));
479 if (!sport) {
480 /* search free port */
481 int port, pmin, pmax;
482
483 phonet_get_local_port_range(&pmin, &pmax);
484 for (port = pmin; port <= pmax; port++) {
485 port_cur++;
486 if (port_cur < pmin || port_cur > pmax)
487 port_cur = pmin;
488
489 pn_sockaddr_set_port(&try_sa, port_cur);
490 tmpsk = pn_find_sock_by_sa(net, &try_sa);
491 if (tmpsk == NULL) {
492 sport = port_cur;
493 goto found;
494 } else
495 sock_put(tmpsk);
496 }
497 } else {
498 /* try to find specific port */
499 pn_sockaddr_set_port(&try_sa, sport);
500 tmpsk = pn_find_sock_by_sa(net, &try_sa);
501 if (tmpsk == NULL)
502 /* No sock there! We can use that port... */
503 goto found;
504 else
505 sock_put(tmpsk);
506 }
507 /* the port must be in use already */
508 return -EADDRINUSE;
509
510found:
511 pn->sobject = pn_object(pn_addr(pn->sobject), sport);
512 return 0;
513}
514EXPORT_SYMBOL(pn_sock_get_port);
515
516#ifdef CONFIG_PROC_FS
517static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)
518{
519 struct net *net = seq_file_net(seq);
520 struct hlist_head *hlist = pnsocks.hlist;
521 struct sock *sknode;
522 unsigned int h;
523
524 for (h = 0; h < PN_HASHSIZE; h++) {
525 sk_for_each_rcu(sknode, hlist) {
526 if (!net_eq(net, sock_net(sknode)))
527 continue;
528 if (!pos)
529 return sknode;
530 pos--;
531 }
532 hlist++;
533 }
534 return NULL;
535}
536
537static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk)
538{
539 struct net *net = seq_file_net(seq);
540
541 do
542 sk = sk_next(sk);
543 while (sk && !net_eq(net, sock_net(sk)));
544
545 return sk;
546}
547
548static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos)
549 __acquires(rcu)
550{
551 rcu_read_lock();
552 return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
553}
554
555static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos)
556{
557 struct sock *sk;
558
559 if (v == SEQ_START_TOKEN)
560 sk = pn_sock_get_idx(seq, 0);
561 else
562 sk = pn_sock_get_next(seq, v);
563 (*pos)++;
564 return sk;
565}
566
567static void pn_sock_seq_stop(struct seq_file *seq, void *v)
568 __releases(rcu)
569{
570 rcu_read_unlock();
571}
572
573static int pn_sock_seq_show(struct seq_file *seq, void *v)
574{
575 seq_setwidth(seq, 127);
576 if (v == SEQ_START_TOKEN)
577 seq_puts(seq, "pt loc rem rs st tx_queue rx_queue "
578 " uid inode ref pointer drops");
579 else {
580 struct sock *sk = v;
581 struct pn_sock *pn = pn_sk(sk);
582
583 seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
584 "%d %pK %u",
585 sk->sk_protocol, pn->sobject, pn->dobject,
586 pn->resource, sk->sk_state,
587 sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
588 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
589 sock_i_ino(sk),
590 refcount_read(&sk->sk_refcnt), sk,
591 atomic_read(&sk->sk_drops));
592 }
593 seq_pad(seq, '\n');
594 return 0;
595}
596
597const struct seq_operations pn_sock_seq_ops = {
598 .start = pn_sock_seq_start,
599 .next = pn_sock_seq_next,
600 .stop = pn_sock_seq_stop,
601 .show = pn_sock_seq_show,
602};
603#endif
604
605static struct {
606 struct sock *sk[256];
607} pnres;
608
609/*
610 * Find and hold socket based on resource.
611 */
612struct sock *pn_find_sock_by_res(struct net *net, u8 res)
613{
614 struct sock *sk;
615
616 if (!net_eq(net, &init_net))
617 return NULL;
618
619 rcu_read_lock();
620 sk = rcu_dereference(pnres.sk[res]);
621 if (sk)
622 sock_hold(sk);
623 rcu_read_unlock();
624 return sk;
625}
626
627static DEFINE_MUTEX(resource_mutex);
628
629int pn_sock_bind_res(struct sock *sk, u8 res)
630{
631 int ret = -EADDRINUSE;
632
633 if (!net_eq(sock_net(sk), &init_net))
634 return -ENOIOCTLCMD;
635 if (!capable(CAP_SYS_ADMIN))
636 return -EPERM;
637 if (pn_socket_autobind(sk->sk_socket))
638 return -EAGAIN;
639
640 mutex_lock(&resource_mutex);
641 if (pnres.sk[res] == NULL) {
642 sock_hold(sk);
643 rcu_assign_pointer(pnres.sk[res], sk);
644 ret = 0;
645 }
646 mutex_unlock(&resource_mutex);
647 return ret;
648}
649
650int pn_sock_unbind_res(struct sock *sk, u8 res)
651{
652 int ret = -ENOENT;
653
654 if (!capable(CAP_SYS_ADMIN))
655 return -EPERM;
656
657 mutex_lock(&resource_mutex);
658 if (pnres.sk[res] == sk) {
659 RCU_INIT_POINTER(pnres.sk[res], NULL);
660 ret = 0;
661 }
662 mutex_unlock(&resource_mutex);
663
664 if (ret == 0) {
665 synchronize_rcu();
666 sock_put(sk);
667 }
668 return ret;
669}
670
671void pn_sock_unbind_all_res(struct sock *sk)
672{
673 unsigned int res, match = 0;
674
675 mutex_lock(&resource_mutex);
676 for (res = 0; res < 256; res++) {
677 if (pnres.sk[res] == sk) {
678 RCU_INIT_POINTER(pnres.sk[res], NULL);
679 match++;
680 }
681 }
682 mutex_unlock(&resource_mutex);
683
684 while (match > 0) {
685 __sock_put(sk);
686 match--;
687 }
688 /* Caller is responsible for RCU sync before final sock_put() */
689}
690
691#ifdef CONFIG_PROC_FS
692static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos)
693{
694 struct net *net = seq_file_net(seq);
695 unsigned int i;
696
697 if (!net_eq(net, &init_net))
698 return NULL;
699
700 for (i = 0; i < 256; i++) {
701 if (pnres.sk[i] == NULL)
702 continue;
703 if (!pos)
704 return pnres.sk + i;
705 pos--;
706 }
707 return NULL;
708}
709
710static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk)
711{
712 struct net *net = seq_file_net(seq);
713 unsigned int i;
714
715 BUG_ON(!net_eq(net, &init_net));
716
717 for (i = (sk - pnres.sk) + 1; i < 256; i++)
718 if (pnres.sk[i])
719 return pnres.sk + i;
720 return NULL;
721}
722
723static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos)
724 __acquires(resource_mutex)
725{
726 mutex_lock(&resource_mutex);
727 return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
728}
729
730static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos)
731{
732 struct sock **sk;
733
734 if (v == SEQ_START_TOKEN)
735 sk = pn_res_get_idx(seq, 0);
736 else
737 sk = pn_res_get_next(seq, v);
738 (*pos)++;
739 return sk;
740}
741
742static void pn_res_seq_stop(struct seq_file *seq, void *v)
743 __releases(resource_mutex)
744{
745 mutex_unlock(&resource_mutex);
746}
747
748static int pn_res_seq_show(struct seq_file *seq, void *v)
749{
750 seq_setwidth(seq, 63);
751 if (v == SEQ_START_TOKEN)
752 seq_puts(seq, "rs uid inode");
753 else {
754 struct sock **psk = v;
755 struct sock *sk = *psk;
756
757 seq_printf(seq, "%02X %5u %lu",
758 (int) (psk - pnres.sk),
759 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
760 sock_i_ino(sk));
761 }
762 seq_pad(seq, '\n');
763 return 0;
764}
765
766const struct seq_operations pn_res_seq_ops = {
767 .start = pn_res_seq_start,
768 .next = pn_res_seq_next,
769 .stop = pn_res_seq_stop,
770 .show = pn_res_seq_show,
771};
772#endif
1/*
2 * File: socket.c
3 *
4 * Phonet sockets
5 *
6 * Copyright (C) 2008 Nokia Corporation.
7 *
8 * Authors: Sakari Ailus <sakari.ailus@nokia.com>
9 * Rémi Denis-Courmont
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * version 2 as published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
23 * 02110-1301 USA
24 */
25
26#include <linux/gfp.h>
27#include <linux/kernel.h>
28#include <linux/net.h>
29#include <linux/poll.h>
30#include <linux/sched/signal.h>
31
32#include <net/sock.h>
33#include <net/tcp_states.h>
34
35#include <linux/phonet.h>
36#include <linux/export.h>
37#include <net/phonet/phonet.h>
38#include <net/phonet/pep.h>
39#include <net/phonet/pn_dev.h>
40
41static int pn_socket_release(struct socket *sock)
42{
43 struct sock *sk = sock->sk;
44
45 if (sk) {
46 sock->sk = NULL;
47 sk->sk_prot->close(sk, 0);
48 }
49 return 0;
50}
51
52#define PN_HASHSIZE 16
53#define PN_HASHMASK (PN_HASHSIZE-1)
54
55
56static struct {
57 struct hlist_head hlist[PN_HASHSIZE];
58 struct mutex lock;
59} pnsocks;
60
61void __init pn_sock_init(void)
62{
63 unsigned int i;
64
65 for (i = 0; i < PN_HASHSIZE; i++)
66 INIT_HLIST_HEAD(pnsocks.hlist + i);
67 mutex_init(&pnsocks.lock);
68}
69
70static struct hlist_head *pn_hash_list(u16 obj)
71{
72 return pnsocks.hlist + (obj & PN_HASHMASK);
73}
74
75/*
76 * Find address based on socket address, match only certain fields.
77 * Also grab sock if it was found. Remember to sock_put it later.
78 */
79struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
80{
81 struct sock *sknode;
82 struct sock *rval = NULL;
83 u16 obj = pn_sockaddr_get_object(spn);
84 u8 res = spn->spn_resource;
85 struct hlist_head *hlist = pn_hash_list(obj);
86
87 rcu_read_lock();
88 sk_for_each_rcu(sknode, hlist) {
89 struct pn_sock *pn = pn_sk(sknode);
90 BUG_ON(!pn->sobject); /* unbound socket */
91
92 if (!net_eq(sock_net(sknode), net))
93 continue;
94 if (pn_port(obj)) {
95 /* Look up socket by port */
96 if (pn_port(pn->sobject) != pn_port(obj))
97 continue;
98 } else {
99 /* If port is zero, look up by resource */
100 if (pn->resource != res)
101 continue;
102 }
103 if (pn_addr(pn->sobject) &&
104 pn_addr(pn->sobject) != pn_addr(obj))
105 continue;
106
107 rval = sknode;
108 sock_hold(sknode);
109 break;
110 }
111 rcu_read_unlock();
112
113 return rval;
114}
115
116/* Deliver a broadcast packet (only in bottom-half) */
117void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
118{
119 struct hlist_head *hlist = pnsocks.hlist;
120 unsigned int h;
121
122 rcu_read_lock();
123 for (h = 0; h < PN_HASHSIZE; h++) {
124 struct sock *sknode;
125
126 sk_for_each(sknode, hlist) {
127 struct sk_buff *clone;
128
129 if (!net_eq(sock_net(sknode), net))
130 continue;
131 if (!sock_flag(sknode, SOCK_BROADCAST))
132 continue;
133
134 clone = skb_clone(skb, GFP_ATOMIC);
135 if (clone) {
136 sock_hold(sknode);
137 sk_receive_skb(sknode, clone, 0);
138 }
139 }
140 hlist++;
141 }
142 rcu_read_unlock();
143}
144
145int pn_sock_hash(struct sock *sk)
146{
147 struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
148
149 mutex_lock(&pnsocks.lock);
150 sk_add_node_rcu(sk, hlist);
151 mutex_unlock(&pnsocks.lock);
152
153 return 0;
154}
155EXPORT_SYMBOL(pn_sock_hash);
156
157void pn_sock_unhash(struct sock *sk)
158{
159 mutex_lock(&pnsocks.lock);
160 sk_del_node_init_rcu(sk);
161 mutex_unlock(&pnsocks.lock);
162 pn_sock_unbind_all_res(sk);
163 synchronize_rcu();
164}
165EXPORT_SYMBOL(pn_sock_unhash);
166
167static DEFINE_MUTEX(port_mutex);
168
169static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len)
170{
171 struct sock *sk = sock->sk;
172 struct pn_sock *pn = pn_sk(sk);
173 struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
174 int err;
175 u16 handle;
176 u8 saddr;
177
178 if (sk->sk_prot->bind)
179 return sk->sk_prot->bind(sk, addr, len);
180
181 if (len < sizeof(struct sockaddr_pn))
182 return -EINVAL;
183 if (spn->spn_family != AF_PHONET)
184 return -EAFNOSUPPORT;
185
186 handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr);
187 saddr = pn_addr(handle);
188 if (saddr && phonet_address_lookup(sock_net(sk), saddr))
189 return -EADDRNOTAVAIL;
190
191 lock_sock(sk);
192 if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) {
193 err = -EINVAL; /* attempt to rebind */
194 goto out;
195 }
196 WARN_ON(sk_hashed(sk));
197 mutex_lock(&port_mutex);
198 err = sk->sk_prot->get_port(sk, pn_port(handle));
199 if (err)
200 goto out_port;
201
202 /* get_port() sets the port, bind() sets the address if applicable */
203 pn->sobject = pn_object(saddr, pn_port(pn->sobject));
204 pn->resource = spn->spn_resource;
205
206 /* Enable RX on the socket */
207 err = sk->sk_prot->hash(sk);
208out_port:
209 mutex_unlock(&port_mutex);
210out:
211 release_sock(sk);
212 return err;
213}
214
215static int pn_socket_autobind(struct socket *sock)
216{
217 struct sockaddr_pn sa;
218 int err;
219
220 memset(&sa, 0, sizeof(sa));
221 sa.spn_family = AF_PHONET;
222 err = pn_socket_bind(sock, (struct sockaddr *)&sa,
223 sizeof(struct sockaddr_pn));
224 if (err != -EINVAL)
225 return err;
226 BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
227 return 0; /* socket was already bound */
228}
229
230static int pn_socket_connect(struct socket *sock, struct sockaddr *addr,
231 int len, int flags)
232{
233 struct sock *sk = sock->sk;
234 struct pn_sock *pn = pn_sk(sk);
235 struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
236 struct task_struct *tsk = current;
237 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
238 int err;
239
240 if (pn_socket_autobind(sock))
241 return -ENOBUFS;
242 if (len < sizeof(struct sockaddr_pn))
243 return -EINVAL;
244 if (spn->spn_family != AF_PHONET)
245 return -EAFNOSUPPORT;
246
247 lock_sock(sk);
248
249 switch (sock->state) {
250 case SS_UNCONNECTED:
251 if (sk->sk_state != TCP_CLOSE) {
252 err = -EISCONN;
253 goto out;
254 }
255 break;
256 case SS_CONNECTING:
257 err = -EALREADY;
258 goto out;
259 default:
260 err = -EISCONN;
261 goto out;
262 }
263
264 pn->dobject = pn_sockaddr_get_object(spn);
265 pn->resource = pn_sockaddr_get_resource(spn);
266 sock->state = SS_CONNECTING;
267
268 err = sk->sk_prot->connect(sk, addr, len);
269 if (err) {
270 sock->state = SS_UNCONNECTED;
271 pn->dobject = 0;
272 goto out;
273 }
274
275 while (sk->sk_state == TCP_SYN_SENT) {
276 DEFINE_WAIT(wait);
277
278 if (!timeo) {
279 err = -EINPROGRESS;
280 goto out;
281 }
282 if (signal_pending(tsk)) {
283 err = sock_intr_errno(timeo);
284 goto out;
285 }
286
287 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
288 TASK_INTERRUPTIBLE);
289 release_sock(sk);
290 timeo = schedule_timeout(timeo);
291 lock_sock(sk);
292 finish_wait(sk_sleep(sk), &wait);
293 }
294
295 if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED))
296 err = 0;
297 else if (sk->sk_state == TCP_CLOSE_WAIT)
298 err = -ECONNRESET;
299 else
300 err = -ECONNREFUSED;
301 sock->state = err ? SS_UNCONNECTED : SS_CONNECTED;
302out:
303 release_sock(sk);
304 return err;
305}
306
307static int pn_socket_accept(struct socket *sock, struct socket *newsock,
308 int flags, bool kern)
309{
310 struct sock *sk = sock->sk;
311 struct sock *newsk;
312 int err;
313
314 if (unlikely(sk->sk_state != TCP_LISTEN))
315 return -EINVAL;
316
317 newsk = sk->sk_prot->accept(sk, flags, &err, kern);
318 if (!newsk)
319 return err;
320
321 lock_sock(newsk);
322 sock_graft(newsk, newsock);
323 newsock->state = SS_CONNECTED;
324 release_sock(newsk);
325 return 0;
326}
327
328static int pn_socket_getname(struct socket *sock, struct sockaddr *addr,
329 int peer)
330{
331 struct sock *sk = sock->sk;
332 struct pn_sock *pn = pn_sk(sk);
333
334 memset(addr, 0, sizeof(struct sockaddr_pn));
335 addr->sa_family = AF_PHONET;
336 if (!peer) /* Race with bind() here is userland's problem. */
337 pn_sockaddr_set_object((struct sockaddr_pn *)addr,
338 pn->sobject);
339
340 return sizeof(struct sockaddr_pn);
341}
342
343static __poll_t pn_socket_poll(struct file *file, struct socket *sock,
344 poll_table *wait)
345{
346 struct sock *sk = sock->sk;
347 struct pep_sock *pn = pep_sk(sk);
348 __poll_t mask = 0;
349
350 poll_wait(file, sk_sleep(sk), wait);
351
352 if (sk->sk_state == TCP_CLOSE)
353 return EPOLLERR;
354 if (!skb_queue_empty(&sk->sk_receive_queue))
355 mask |= EPOLLIN | EPOLLRDNORM;
356 if (!skb_queue_empty(&pn->ctrlreq_queue))
357 mask |= EPOLLPRI;
358 if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
359 return EPOLLHUP;
360
361 if (sk->sk_state == TCP_ESTABLISHED &&
362 refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
363 atomic_read(&pn->tx_credits))
364 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
365
366 return mask;
367}
368
369static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
370 unsigned long arg)
371{
372 struct sock *sk = sock->sk;
373 struct pn_sock *pn = pn_sk(sk);
374
375 if (cmd == SIOCPNGETOBJECT) {
376 struct net_device *dev;
377 u16 handle;
378 u8 saddr;
379
380 if (get_user(handle, (__u16 __user *)arg))
381 return -EFAULT;
382
383 lock_sock(sk);
384 if (sk->sk_bound_dev_if)
385 dev = dev_get_by_index(sock_net(sk),
386 sk->sk_bound_dev_if);
387 else
388 dev = phonet_device_get(sock_net(sk));
389 if (dev && (dev->flags & IFF_UP))
390 saddr = phonet_address_get(dev, pn_addr(handle));
391 else
392 saddr = PN_NO_ADDR;
393 release_sock(sk);
394
395 if (dev)
396 dev_put(dev);
397 if (saddr == PN_NO_ADDR)
398 return -EHOSTUNREACH;
399
400 handle = pn_object(saddr, pn_port(pn->sobject));
401 return put_user(handle, (__u16 __user *)arg);
402 }
403
404 return sk->sk_prot->ioctl(sk, cmd, arg);
405}
406
407static int pn_socket_listen(struct socket *sock, int backlog)
408{
409 struct sock *sk = sock->sk;
410 int err = 0;
411
412 if (pn_socket_autobind(sock))
413 return -ENOBUFS;
414
415 lock_sock(sk);
416 if (sock->state != SS_UNCONNECTED) {
417 err = -EINVAL;
418 goto out;
419 }
420
421 if (sk->sk_state != TCP_LISTEN) {
422 sk->sk_state = TCP_LISTEN;
423 sk->sk_ack_backlog = 0;
424 }
425 sk->sk_max_ack_backlog = backlog;
426out:
427 release_sock(sk);
428 return err;
429}
430
431static int pn_socket_sendmsg(struct socket *sock, struct msghdr *m,
432 size_t total_len)
433{
434 struct sock *sk = sock->sk;
435
436 if (pn_socket_autobind(sock))
437 return -EAGAIN;
438
439 return sk->sk_prot->sendmsg(sk, m, total_len);
440}
441
442const struct proto_ops phonet_dgram_ops = {
443 .family = AF_PHONET,
444 .owner = THIS_MODULE,
445 .release = pn_socket_release,
446 .bind = pn_socket_bind,
447 .connect = sock_no_connect,
448 .socketpair = sock_no_socketpair,
449 .accept = sock_no_accept,
450 .getname = pn_socket_getname,
451 .poll = datagram_poll,
452 .ioctl = pn_socket_ioctl,
453 .listen = sock_no_listen,
454 .shutdown = sock_no_shutdown,
455 .setsockopt = sock_no_setsockopt,
456 .getsockopt = sock_no_getsockopt,
457#ifdef CONFIG_COMPAT
458 .compat_setsockopt = sock_no_setsockopt,
459 .compat_getsockopt = sock_no_getsockopt,
460#endif
461 .sendmsg = pn_socket_sendmsg,
462 .recvmsg = sock_common_recvmsg,
463 .mmap = sock_no_mmap,
464 .sendpage = sock_no_sendpage,
465};
466
467const struct proto_ops phonet_stream_ops = {
468 .family = AF_PHONET,
469 .owner = THIS_MODULE,
470 .release = pn_socket_release,
471 .bind = pn_socket_bind,
472 .connect = pn_socket_connect,
473 .socketpair = sock_no_socketpair,
474 .accept = pn_socket_accept,
475 .getname = pn_socket_getname,
476 .poll = pn_socket_poll,
477 .ioctl = pn_socket_ioctl,
478 .listen = pn_socket_listen,
479 .shutdown = sock_no_shutdown,
480 .setsockopt = sock_common_setsockopt,
481 .getsockopt = sock_common_getsockopt,
482#ifdef CONFIG_COMPAT
483 .compat_setsockopt = compat_sock_common_setsockopt,
484 .compat_getsockopt = compat_sock_common_getsockopt,
485#endif
486 .sendmsg = pn_socket_sendmsg,
487 .recvmsg = sock_common_recvmsg,
488 .mmap = sock_no_mmap,
489 .sendpage = sock_no_sendpage,
490};
491EXPORT_SYMBOL(phonet_stream_ops);
492
493/* allocate port for a socket */
494int pn_sock_get_port(struct sock *sk, unsigned short sport)
495{
496 static int port_cur;
497 struct net *net = sock_net(sk);
498 struct pn_sock *pn = pn_sk(sk);
499 struct sockaddr_pn try_sa;
500 struct sock *tmpsk;
501
502 memset(&try_sa, 0, sizeof(struct sockaddr_pn));
503 try_sa.spn_family = AF_PHONET;
504 WARN_ON(!mutex_is_locked(&port_mutex));
505 if (!sport) {
506 /* search free port */
507 int port, pmin, pmax;
508
509 phonet_get_local_port_range(&pmin, &pmax);
510 for (port = pmin; port <= pmax; port++) {
511 port_cur++;
512 if (port_cur < pmin || port_cur > pmax)
513 port_cur = pmin;
514
515 pn_sockaddr_set_port(&try_sa, port_cur);
516 tmpsk = pn_find_sock_by_sa(net, &try_sa);
517 if (tmpsk == NULL) {
518 sport = port_cur;
519 goto found;
520 } else
521 sock_put(tmpsk);
522 }
523 } else {
524 /* try to find specific port */
525 pn_sockaddr_set_port(&try_sa, sport);
526 tmpsk = pn_find_sock_by_sa(net, &try_sa);
527 if (tmpsk == NULL)
528 /* No sock there! We can use that port... */
529 goto found;
530 else
531 sock_put(tmpsk);
532 }
533 /* the port must be in use already */
534 return -EADDRINUSE;
535
536found:
537 pn->sobject = pn_object(pn_addr(pn->sobject), sport);
538 return 0;
539}
540EXPORT_SYMBOL(pn_sock_get_port);
541
542#ifdef CONFIG_PROC_FS
543static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)
544{
545 struct net *net = seq_file_net(seq);
546 struct hlist_head *hlist = pnsocks.hlist;
547 struct sock *sknode;
548 unsigned int h;
549
550 for (h = 0; h < PN_HASHSIZE; h++) {
551 sk_for_each_rcu(sknode, hlist) {
552 if (!net_eq(net, sock_net(sknode)))
553 continue;
554 if (!pos)
555 return sknode;
556 pos--;
557 }
558 hlist++;
559 }
560 return NULL;
561}
562
563static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk)
564{
565 struct net *net = seq_file_net(seq);
566
567 do
568 sk = sk_next(sk);
569 while (sk && !net_eq(net, sock_net(sk)));
570
571 return sk;
572}
573
574static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos)
575 __acquires(rcu)
576{
577 rcu_read_lock();
578 return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
579}
580
581static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos)
582{
583 struct sock *sk;
584
585 if (v == SEQ_START_TOKEN)
586 sk = pn_sock_get_idx(seq, 0);
587 else
588 sk = pn_sock_get_next(seq, v);
589 (*pos)++;
590 return sk;
591}
592
593static void pn_sock_seq_stop(struct seq_file *seq, void *v)
594 __releases(rcu)
595{
596 rcu_read_unlock();
597}
598
599static int pn_sock_seq_show(struct seq_file *seq, void *v)
600{
601 seq_setwidth(seq, 127);
602 if (v == SEQ_START_TOKEN)
603 seq_puts(seq, "pt loc rem rs st tx_queue rx_queue "
604 " uid inode ref pointer drops");
605 else {
606 struct sock *sk = v;
607 struct pn_sock *pn = pn_sk(sk);
608
609 seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
610 "%d %pK %d",
611 sk->sk_protocol, pn->sobject, pn->dobject,
612 pn->resource, sk->sk_state,
613 sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
614 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
615 sock_i_ino(sk),
616 refcount_read(&sk->sk_refcnt), sk,
617 atomic_read(&sk->sk_drops));
618 }
619 seq_pad(seq, '\n');
620 return 0;
621}
622
623static const struct seq_operations pn_sock_seq_ops = {
624 .start = pn_sock_seq_start,
625 .next = pn_sock_seq_next,
626 .stop = pn_sock_seq_stop,
627 .show = pn_sock_seq_show,
628};
629
630static int pn_sock_open(struct inode *inode, struct file *file)
631{
632 return seq_open_net(inode, file, &pn_sock_seq_ops,
633 sizeof(struct seq_net_private));
634}
635
636const struct file_operations pn_sock_seq_fops = {
637 .open = pn_sock_open,
638 .read = seq_read,
639 .llseek = seq_lseek,
640 .release = seq_release_net,
641};
642#endif
643
644static struct {
645 struct sock *sk[256];
646} pnres;
647
648/*
649 * Find and hold socket based on resource.
650 */
651struct sock *pn_find_sock_by_res(struct net *net, u8 res)
652{
653 struct sock *sk;
654
655 if (!net_eq(net, &init_net))
656 return NULL;
657
658 rcu_read_lock();
659 sk = rcu_dereference(pnres.sk[res]);
660 if (sk)
661 sock_hold(sk);
662 rcu_read_unlock();
663 return sk;
664}
665
666static DEFINE_MUTEX(resource_mutex);
667
668int pn_sock_bind_res(struct sock *sk, u8 res)
669{
670 int ret = -EADDRINUSE;
671
672 if (!net_eq(sock_net(sk), &init_net))
673 return -ENOIOCTLCMD;
674 if (!capable(CAP_SYS_ADMIN))
675 return -EPERM;
676 if (pn_socket_autobind(sk->sk_socket))
677 return -EAGAIN;
678
679 mutex_lock(&resource_mutex);
680 if (pnres.sk[res] == NULL) {
681 sock_hold(sk);
682 rcu_assign_pointer(pnres.sk[res], sk);
683 ret = 0;
684 }
685 mutex_unlock(&resource_mutex);
686 return ret;
687}
688
689int pn_sock_unbind_res(struct sock *sk, u8 res)
690{
691 int ret = -ENOENT;
692
693 if (!capable(CAP_SYS_ADMIN))
694 return -EPERM;
695
696 mutex_lock(&resource_mutex);
697 if (pnres.sk[res] == sk) {
698 RCU_INIT_POINTER(pnres.sk[res], NULL);
699 ret = 0;
700 }
701 mutex_unlock(&resource_mutex);
702
703 if (ret == 0) {
704 synchronize_rcu();
705 sock_put(sk);
706 }
707 return ret;
708}
709
710void pn_sock_unbind_all_res(struct sock *sk)
711{
712 unsigned int res, match = 0;
713
714 mutex_lock(&resource_mutex);
715 for (res = 0; res < 256; res++) {
716 if (pnres.sk[res] == sk) {
717 RCU_INIT_POINTER(pnres.sk[res], NULL);
718 match++;
719 }
720 }
721 mutex_unlock(&resource_mutex);
722
723 while (match > 0) {
724 __sock_put(sk);
725 match--;
726 }
727 /* Caller is responsible for RCU sync before final sock_put() */
728}
729
730#ifdef CONFIG_PROC_FS
731static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos)
732{
733 struct net *net = seq_file_net(seq);
734 unsigned int i;
735
736 if (!net_eq(net, &init_net))
737 return NULL;
738
739 for (i = 0; i < 256; i++) {
740 if (pnres.sk[i] == NULL)
741 continue;
742 if (!pos)
743 return pnres.sk + i;
744 pos--;
745 }
746 return NULL;
747}
748
749static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk)
750{
751 struct net *net = seq_file_net(seq);
752 unsigned int i;
753
754 BUG_ON(!net_eq(net, &init_net));
755
756 for (i = (sk - pnres.sk) + 1; i < 256; i++)
757 if (pnres.sk[i])
758 return pnres.sk + i;
759 return NULL;
760}
761
762static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos)
763 __acquires(resource_mutex)
764{
765 mutex_lock(&resource_mutex);
766 return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
767}
768
769static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos)
770{
771 struct sock **sk;
772
773 if (v == SEQ_START_TOKEN)
774 sk = pn_res_get_idx(seq, 0);
775 else
776 sk = pn_res_get_next(seq, v);
777 (*pos)++;
778 return sk;
779}
780
781static void pn_res_seq_stop(struct seq_file *seq, void *v)
782 __releases(resource_mutex)
783{
784 mutex_unlock(&resource_mutex);
785}
786
787static int pn_res_seq_show(struct seq_file *seq, void *v)
788{
789 seq_setwidth(seq, 63);
790 if (v == SEQ_START_TOKEN)
791 seq_puts(seq, "rs uid inode");
792 else {
793 struct sock **psk = v;
794 struct sock *sk = *psk;
795
796 seq_printf(seq, "%02X %5u %lu",
797 (int) (psk - pnres.sk),
798 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
799 sock_i_ino(sk));
800 }
801 seq_pad(seq, '\n');
802 return 0;
803}
804
805static const struct seq_operations pn_res_seq_ops = {
806 .start = pn_res_seq_start,
807 .next = pn_res_seq_next,
808 .stop = pn_res_seq_stop,
809 .show = pn_res_seq_show,
810};
811
812static int pn_res_open(struct inode *inode, struct file *file)
813{
814 return seq_open_net(inode, file, &pn_res_seq_ops,
815 sizeof(struct seq_net_private));
816}
817
818const struct file_operations pn_res_seq_fops = {
819 .open = pn_res_open,
820 .read = seq_read,
821 .llseek = seq_lseek,
822 .release = seq_release_net,
823};
824#endif