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