1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
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
77
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);
91
92 if (!net_eq(sock_net(sknode), net))
93 continue;
94 if (pn_port(obj)) {
95
96 if (pn_port(pn->sobject) != pn_port(obj))
97 continue;
98 } else {
99
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
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;
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
203 pn->sobject = pn_object(saddr, pn_port(pn->sobject));
204 pn->resource = spn->spn_resource;
205
206
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;
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 *sockaddr_len, 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)
337 pn_sockaddr_set_object((struct sockaddr_pn *)addr,
338 pn->sobject);
339
340 *sockaddr_len = sizeof(struct sockaddr_pn);
341 return 0;
342}
343
344static __poll_t pn_socket_poll(struct file *file, struct socket *sock,
345 poll_table *wait)
346{
347 struct sock *sk = sock->sk;
348 struct pep_sock *pn = pep_sk(sk);
349 __poll_t mask = 0;
350
351 poll_wait(file, sk_sleep(sk), wait);
352
353 if (sk->sk_state == TCP_CLOSE)
354 return EPOLLERR;
355 if (!skb_queue_empty(&sk->sk_receive_queue))
356 mask |= EPOLLIN | EPOLLRDNORM;
357 if (!skb_queue_empty(&pn->ctrlreq_queue))
358 mask |= EPOLLPRI;
359 if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
360 return EPOLLHUP;
361
362 if (sk->sk_state == TCP_ESTABLISHED &&
363 refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
364 atomic_read(&pn->tx_credits))
365 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
366
367 return mask;
368}
369
370static int pn_socket_ioctl(struct socket *sock, unsigned int cmd,
371 unsigned long arg)
372{
373 struct sock *sk = sock->sk;
374 struct pn_sock *pn = pn_sk(sk);
375
376 if (cmd == SIOCPNGETOBJECT) {
377 struct net_device *dev;
378 u16 handle;
379 u8 saddr;
380
381 if (get_user(handle, (__u16 __user *)arg))
382 return -EFAULT;
383
384 lock_sock(sk);
385 if (sk->sk_bound_dev_if)
386 dev = dev_get_by_index(sock_net(sk),
387 sk->sk_bound_dev_if);
388 else
389 dev = phonet_device_get(sock_net(sk));
390 if (dev && (dev->flags & IFF_UP))
391 saddr = phonet_address_get(dev, pn_addr(handle));
392 else
393 saddr = PN_NO_ADDR;
394 release_sock(sk);
395
396 if (dev)
397 dev_put(dev);
398 if (saddr == PN_NO_ADDR)
399 return -EHOSTUNREACH;
400
401 handle = pn_object(saddr, pn_port(pn->sobject));
402 return put_user(handle, (__u16 __user *)arg);
403 }
404
405 return sk->sk_prot->ioctl(sk, cmd, arg);
406}
407
408static int pn_socket_listen(struct socket *sock, int backlog)
409{
410 struct sock *sk = sock->sk;
411 int err = 0;
412
413 if (pn_socket_autobind(sock))
414 return -ENOBUFS;
415
416 lock_sock(sk);
417 if (sock->state != SS_UNCONNECTED) {
418 err = -EINVAL;
419 goto out;
420 }
421
422 if (sk->sk_state != TCP_LISTEN) {
423 sk->sk_state = TCP_LISTEN;
424 sk->sk_ack_backlog = 0;
425 }
426 sk->sk_max_ack_backlog = backlog;
427out:
428 release_sock(sk);
429 return err;
430}
431
432static int pn_socket_sendmsg(struct socket *sock, struct msghdr *m,
433 size_t total_len)
434{
435 struct sock *sk = sock->sk;
436
437 if (pn_socket_autobind(sock))
438 return -EAGAIN;
439
440 return sk->sk_prot->sendmsg(sk, m, total_len);
441}
442
443const struct proto_ops phonet_dgram_ops = {
444 .family = AF_PHONET,
445 .owner = THIS_MODULE,
446 .release = pn_socket_release,
447 .bind = pn_socket_bind,
448 .connect = sock_no_connect,
449 .socketpair = sock_no_socketpair,
450 .accept = sock_no_accept,
451 .getname = pn_socket_getname,
452 .poll = datagram_poll,
453 .ioctl = pn_socket_ioctl,
454 .listen = sock_no_listen,
455 .shutdown = sock_no_shutdown,
456 .setsockopt = sock_no_setsockopt,
457 .getsockopt = sock_no_getsockopt,
458#ifdef CONFIG_COMPAT
459 .compat_setsockopt = sock_no_setsockopt,
460 .compat_getsockopt = sock_no_getsockopt,
461#endif
462 .sendmsg = pn_socket_sendmsg,
463 .recvmsg = sock_common_recvmsg,
464 .mmap = sock_no_mmap,
465 .sendpage = sock_no_sendpage,
466};
467
468const struct proto_ops phonet_stream_ops = {
469 .family = AF_PHONET,
470 .owner = THIS_MODULE,
471 .release = pn_socket_release,
472 .bind = pn_socket_bind,
473 .connect = pn_socket_connect,
474 .socketpair = sock_no_socketpair,
475 .accept = pn_socket_accept,
476 .getname = pn_socket_getname,
477 .poll = pn_socket_poll,
478 .ioctl = pn_socket_ioctl,
479 .listen = pn_socket_listen,
480 .shutdown = sock_no_shutdown,
481 .setsockopt = sock_common_setsockopt,
482 .getsockopt = sock_common_getsockopt,
483#ifdef CONFIG_COMPAT
484 .compat_setsockopt = compat_sock_common_setsockopt,
485 .compat_getsockopt = compat_sock_common_getsockopt,
486#endif
487 .sendmsg = pn_socket_sendmsg,
488 .recvmsg = sock_common_recvmsg,
489 .mmap = sock_no_mmap,
490 .sendpage = sock_no_sendpage,
491};
492EXPORT_SYMBOL(phonet_stream_ops);
493
494
495int pn_sock_get_port(struct sock *sk, unsigned short sport)
496{
497 static int port_cur;
498 struct net *net = sock_net(sk);
499 struct pn_sock *pn = pn_sk(sk);
500 struct sockaddr_pn try_sa;
501 struct sock *tmpsk;
502
503 memset(&try_sa, 0, sizeof(struct sockaddr_pn));
504 try_sa.spn_family = AF_PHONET;
505 WARN_ON(!mutex_is_locked(&port_mutex));
506 if (!sport) {
507
508 int port, pmin, pmax;
509
510 phonet_get_local_port_range(&pmin, &pmax);
511 for (port = pmin; port <= pmax; port++) {
512 port_cur++;
513 if (port_cur < pmin || port_cur > pmax)
514 port_cur = pmin;
515
516 pn_sockaddr_set_port(&try_sa, port_cur);
517 tmpsk = pn_find_sock_by_sa(net, &try_sa);
518 if (tmpsk == NULL) {
519 sport = port_cur;
520 goto found;
521 } else
522 sock_put(tmpsk);
523 }
524 } else {
525
526 pn_sockaddr_set_port(&try_sa, sport);
527 tmpsk = pn_find_sock_by_sa(net, &try_sa);
528 if (tmpsk == NULL)
529
530 goto found;
531 else
532 sock_put(tmpsk);
533 }
534
535 return -EADDRINUSE;
536
537found:
538 pn->sobject = pn_object(pn_addr(pn->sobject), sport);
539 return 0;
540}
541EXPORT_SYMBOL(pn_sock_get_port);
542
543#ifdef CONFIG_PROC_FS
544static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)
545{
546 struct net *net = seq_file_net(seq);
547 struct hlist_head *hlist = pnsocks.hlist;
548 struct sock *sknode;
549 unsigned int h;
550
551 for (h = 0; h < PN_HASHSIZE; h++) {
552 sk_for_each_rcu(sknode, hlist) {
553 if (!net_eq(net, sock_net(sknode)))
554 continue;
555 if (!pos)
556 return sknode;
557 pos--;
558 }
559 hlist++;
560 }
561 return NULL;
562}
563
564static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk)
565{
566 struct net *net = seq_file_net(seq);
567
568 do
569 sk = sk_next(sk);
570 while (sk && !net_eq(net, sock_net(sk)));
571
572 return sk;
573}
574
575static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos)
576 __acquires(rcu)
577{
578 rcu_read_lock();
579 return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
580}
581
582static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos)
583{
584 struct sock *sk;
585
586 if (v == SEQ_START_TOKEN)
587 sk = pn_sock_get_idx(seq, 0);
588 else
589 sk = pn_sock_get_next(seq, v);
590 (*pos)++;
591 return sk;
592}
593
594static void pn_sock_seq_stop(struct seq_file *seq, void *v)
595 __releases(rcu)
596{
597 rcu_read_unlock();
598}
599
600static int pn_sock_seq_show(struct seq_file *seq, void *v)
601{
602 seq_setwidth(seq, 127);
603 if (v == SEQ_START_TOKEN)
604 seq_puts(seq, "pt loc rem rs st tx_queue rx_queue "
605 " uid inode ref pointer drops");
606 else {
607 struct sock *sk = v;
608 struct pn_sock *pn = pn_sk(sk);
609
610 seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu "
611 "%d %pK %d",
612 sk->sk_protocol, pn->sobject, pn->dobject,
613 pn->resource, sk->sk_state,
614 sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk),
615 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
616 sock_i_ino(sk),
617 refcount_read(&sk->sk_refcnt), sk,
618 atomic_read(&sk->sk_drops));
619 }
620 seq_pad(seq, '\n');
621 return 0;
622}
623
624static const struct seq_operations pn_sock_seq_ops = {
625 .start = pn_sock_seq_start,
626 .next = pn_sock_seq_next,
627 .stop = pn_sock_seq_stop,
628 .show = pn_sock_seq_show,
629};
630
631static int pn_sock_open(struct inode *inode, struct file *file)
632{
633 return seq_open_net(inode, file, &pn_sock_seq_ops,
634 sizeof(struct seq_net_private));
635}
636
637const struct file_operations pn_sock_seq_fops = {
638 .open = pn_sock_open,
639 .read = seq_read,
640 .llseek = seq_lseek,
641 .release = seq_release_net,
642};
643#endif
644
645static struct {
646 struct sock *sk[256];
647} pnres;
648
649
650
651
652struct sock *pn_find_sock_by_res(struct net *net, u8 res)
653{
654 struct sock *sk;
655
656 if (!net_eq(net, &init_net))
657 return NULL;
658
659 rcu_read_lock();
660 sk = rcu_dereference(pnres.sk[res]);
661 if (sk)
662 sock_hold(sk);
663 rcu_read_unlock();
664 return sk;
665}
666
667static DEFINE_MUTEX(resource_mutex);
668
669int pn_sock_bind_res(struct sock *sk, u8 res)
670{
671 int ret = -EADDRINUSE;
672
673 if (!net_eq(sock_net(sk), &init_net))
674 return -ENOIOCTLCMD;
675 if (!capable(CAP_SYS_ADMIN))
676 return -EPERM;
677 if (pn_socket_autobind(sk->sk_socket))
678 return -EAGAIN;
679
680 mutex_lock(&resource_mutex);
681 if (pnres.sk[res] == NULL) {
682 sock_hold(sk);
683 rcu_assign_pointer(pnres.sk[res], sk);
684 ret = 0;
685 }
686 mutex_unlock(&resource_mutex);
687 return ret;
688}
689
690int pn_sock_unbind_res(struct sock *sk, u8 res)
691{
692 int ret = -ENOENT;
693
694 if (!capable(CAP_SYS_ADMIN))
695 return -EPERM;
696
697 mutex_lock(&resource_mutex);
698 if (pnres.sk[res] == sk) {
699 RCU_INIT_POINTER(pnres.sk[res], NULL);
700 ret = 0;
701 }
702 mutex_unlock(&resource_mutex);
703
704 if (ret == 0) {
705 synchronize_rcu();
706 sock_put(sk);
707 }
708 return ret;
709}
710
711void pn_sock_unbind_all_res(struct sock *sk)
712{
713 unsigned int res, match = 0;
714
715 mutex_lock(&resource_mutex);
716 for (res = 0; res < 256; res++) {
717 if (pnres.sk[res] == sk) {
718 RCU_INIT_POINTER(pnres.sk[res], NULL);
719 match++;
720 }
721 }
722 mutex_unlock(&resource_mutex);
723
724 while (match > 0) {
725 __sock_put(sk);
726 match--;
727 }
728
729}
730
731#ifdef CONFIG_PROC_FS
732static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos)
733{
734 struct net *net = seq_file_net(seq);
735 unsigned int i;
736
737 if (!net_eq(net, &init_net))
738 return NULL;
739
740 for (i = 0; i < 256; i++) {
741 if (pnres.sk[i] == NULL)
742 continue;
743 if (!pos)
744 return pnres.sk + i;
745 pos--;
746 }
747 return NULL;
748}
749
750static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk)
751{
752 struct net *net = seq_file_net(seq);
753 unsigned int i;
754
755 BUG_ON(!net_eq(net, &init_net));
756
757 for (i = (sk - pnres.sk) + 1; i < 256; i++)
758 if (pnres.sk[i])
759 return pnres.sk + i;
760 return NULL;
761}
762
763static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos)
764 __acquires(resource_mutex)
765{
766 mutex_lock(&resource_mutex);
767 return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
768}
769
770static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos)
771{
772 struct sock **sk;
773
774 if (v == SEQ_START_TOKEN)
775 sk = pn_res_get_idx(seq, 0);
776 else
777 sk = pn_res_get_next(seq, v);
778 (*pos)++;
779 return sk;
780}
781
782static void pn_res_seq_stop(struct seq_file *seq, void *v)
783 __releases(resource_mutex)
784{
785 mutex_unlock(&resource_mutex);
786}
787
788static int pn_res_seq_show(struct seq_file *seq, void *v)
789{
790 seq_setwidth(seq, 63);
791 if (v == SEQ_START_TOKEN)
792 seq_puts(seq, "rs uid inode");
793 else {
794 struct sock **psk = v;
795 struct sock *sk = *psk;
796
797 seq_printf(seq, "%02X %5u %lu",
798 (int) (psk - pnres.sk),
799 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
800 sock_i_ino(sk));
801 }
802 seq_pad(seq, '\n');
803 return 0;
804}
805
806static const struct seq_operations pn_res_seq_ops = {
807 .start = pn_res_seq_start,
808 .next = pn_res_seq_next,
809 .stop = pn_res_seq_stop,
810 .show = pn_res_seq_show,
811};
812
813static int pn_res_open(struct inode *inode, struct file *file)
814{
815 return seq_open_net(inode, file, &pn_res_seq_ops,
816 sizeof(struct seq_net_private));
817}
818
819const struct file_operations pn_res_seq_fops = {
820 .open = pn_res_open,
821 .read = seq_read,
822 .llseek = seq_lseek,
823 .release = seq_release_net,
824};
825#endif
826
