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Linux/net/phonet/pep.c

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  1 /*
  2  * File: pep.c
  3  *
  4  * Phonet pipe protocol end point socket
  5  *
  6  * Copyright (C) 2008 Nokia Corporation.
  7  *
  8  * Author: RĂ©mi Denis-Courmont
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public License
 12  * version 2 as published by the Free Software Foundation.
 13  *
 14  * This program is distributed in the hope that it will be useful, but
 15  * WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17  * General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 22  * 02110-1301 USA
 23  */
 24 
 25 #include <linux/kernel.h>
 26 #include <linux/sched/signal.h>
 27 #include <linux/slab.h>
 28 #include <linux/socket.h>
 29 #include <net/sock.h>
 30 #include <net/tcp_states.h>
 31 #include <asm/ioctls.h>
 32 
 33 #include <linux/phonet.h>
 34 #include <linux/module.h>
 35 #include <net/phonet/phonet.h>
 36 #include <net/phonet/pep.h>
 37 #include <net/phonet/gprs.h>
 38 
 39 /* sk_state values:
 40  * TCP_CLOSE            sock not in use yet
 41  * TCP_CLOSE_WAIT       disconnected pipe
 42  * TCP_LISTEN           listening pipe endpoint
 43  * TCP_SYN_RECV         connected pipe in disabled state
 44  * TCP_ESTABLISHED      connected pipe in enabled state
 45  *
 46  * pep_sock locking:
 47  *  - sk_state, hlist: sock lock needed
 48  *  - listener: read only
 49  *  - pipe_handle: read only
 50  */
 51 
 52 #define CREDITS_MAX     10
 53 #define CREDITS_THR     7
 54 
 55 #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
 56 
 57 /* Get the next TLV sub-block. */
 58 static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
 59                                         void *buf)
 60 {
 61         void *data = NULL;
 62         struct {
 63                 u8 sb_type;
 64                 u8 sb_len;
 65         } *ph, h;
 66         int buflen = *plen;
 67 
 68         ph = skb_header_pointer(skb, 0, 2, &h);
 69         if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
 70                 return NULL;
 71         ph->sb_len -= 2;
 72         *ptype = ph->sb_type;
 73         *plen = ph->sb_len;
 74 
 75         if (buflen > ph->sb_len)
 76                 buflen = ph->sb_len;
 77         data = skb_header_pointer(skb, 2, buflen, buf);
 78         __skb_pull(skb, 2 + ph->sb_len);
 79         return data;
 80 }
 81 
 82 static struct sk_buff *pep_alloc_skb(struct sock *sk, const void *payload,
 83                                         int len, gfp_t priority)
 84 {
 85         struct sk_buff *skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
 86         if (!skb)
 87                 return NULL;
 88         skb_set_owner_w(skb, sk);
 89 
 90         skb_reserve(skb, MAX_PNPIPE_HEADER);
 91         __skb_put(skb, len);
 92         skb_copy_to_linear_data(skb, payload, len);
 93         __skb_push(skb, sizeof(struct pnpipehdr));
 94         skb_reset_transport_header(skb);
 95         return skb;
 96 }
 97 
 98 static int pep_reply(struct sock *sk, struct sk_buff *oskb, u8 code,
 99                         const void *data, int len, gfp_t priority)
100 {
101         const struct pnpipehdr *oph = pnp_hdr(oskb);
102         struct pnpipehdr *ph;
103         struct sk_buff *skb;
104         struct sockaddr_pn peer;
105 
106         skb = pep_alloc_skb(sk, data, len, priority);
107         if (!skb)
108                 return -ENOMEM;
109 
110         ph = pnp_hdr(skb);
111         ph->utid = oph->utid;
112         ph->message_id = oph->message_id + 1; /* REQ -> RESP */
113         ph->pipe_handle = oph->pipe_handle;
114         ph->error_code = code;
115 
116         pn_skb_get_src_sockaddr(oskb, &peer);
117         return pn_skb_send(sk, skb, &peer);
118 }
119 
120 static int pep_indicate(struct sock *sk, u8 id, u8 code,
121                         const void *data, int len, gfp_t priority)
122 {
123         struct pep_sock *pn = pep_sk(sk);
124         struct pnpipehdr *ph;
125         struct sk_buff *skb;
126 
127         skb = pep_alloc_skb(sk, data, len, priority);
128         if (!skb)
129                 return -ENOMEM;
130 
131         ph = pnp_hdr(skb);
132         ph->utid = 0;
133         ph->message_id = id;
134         ph->pipe_handle = pn->pipe_handle;
135         ph->data[0] = code;
136         return pn_skb_send(sk, skb, NULL);
137 }
138 
139 #define PAD 0x00
140 
141 static int pipe_handler_request(struct sock *sk, u8 id, u8 code,
142                                 const void *data, int len)
143 {
144         struct pep_sock *pn = pep_sk(sk);
145         struct pnpipehdr *ph;
146         struct sk_buff *skb;
147 
148         skb = pep_alloc_skb(sk, data, len, GFP_KERNEL);
149         if (!skb)
150                 return -ENOMEM;
151 
152         ph = pnp_hdr(skb);
153         ph->utid = id; /* whatever */
154         ph->message_id = id;
155         ph->pipe_handle = pn->pipe_handle;
156         ph->data[0] = code;
157         return pn_skb_send(sk, skb, NULL);
158 }
159 
160 static int pipe_handler_send_created_ind(struct sock *sk)
161 {
162         struct pep_sock *pn = pep_sk(sk);
163         u8 data[4] = {
164                 PN_PIPE_SB_NEGOTIATED_FC, pep_sb_size(2),
165                 pn->tx_fc, pn->rx_fc,
166         };
167 
168         return pep_indicate(sk, PNS_PIPE_CREATED_IND, 1 /* sub-blocks */,
169                                 data, 4, GFP_ATOMIC);
170 }
171 
172 static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
173 {
174         static const u8 data[20] = {
175                 PAD, PAD, PAD, 2 /* sub-blocks */,
176                 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
177                         PN_MULTI_CREDIT_FLOW_CONTROL,
178                         PN_ONE_CREDIT_FLOW_CONTROL,
179                         PN_LEGACY_FLOW_CONTROL,
180                         PAD,
181                 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
182                         PN_MULTI_CREDIT_FLOW_CONTROL,
183                         PN_ONE_CREDIT_FLOW_CONTROL,
184                         PN_LEGACY_FLOW_CONTROL,
185                         PAD,
186         };
187 
188         might_sleep();
189         return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
190                                 GFP_KERNEL);
191 }
192 
193 static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code,
194                                 gfp_t priority)
195 {
196         static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
197         WARN_ON(code == PN_PIPE_NO_ERROR);
198         return pep_reply(sk, skb, code, data, sizeof(data), priority);
199 }
200 
201 /* Control requests are not sent by the pipe service and have a specific
202  * message format. */
203 static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
204                                 gfp_t priority)
205 {
206         const struct pnpipehdr *oph = pnp_hdr(oskb);
207         struct sk_buff *skb;
208         struct pnpipehdr *ph;
209         struct sockaddr_pn dst;
210         u8 data[4] = {
211                 oph->data[0], /* PEP type */
212                 code, /* error code, at an unusual offset */
213                 PAD, PAD,
214         };
215 
216         skb = pep_alloc_skb(sk, data, 4, priority);
217         if (!skb)
218                 return -ENOMEM;
219 
220         ph = pnp_hdr(skb);
221         ph->utid = oph->utid;
222         ph->message_id = PNS_PEP_CTRL_RESP;
223         ph->pipe_handle = oph->pipe_handle;
224         ph->data[0] = oph->data[1]; /* CTRL id */
225 
226         pn_skb_get_src_sockaddr(oskb, &dst);
227         return pn_skb_send(sk, skb, &dst);
228 }
229 
230 static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
231 {
232         u8 data[4] = { type, PAD, PAD, status };
233 
234         return pep_indicate(sk, PNS_PEP_STATUS_IND, PN_PEP_TYPE_COMMON,
235                                 data, 4, priority);
236 }
237 
238 /* Send our RX flow control information to the sender.
239  * Socket must be locked. */
240 static void pipe_grant_credits(struct sock *sk, gfp_t priority)
241 {
242         struct pep_sock *pn = pep_sk(sk);
243 
244         BUG_ON(sk->sk_state != TCP_ESTABLISHED);
245 
246         switch (pn->rx_fc) {
247         case PN_LEGACY_FLOW_CONTROL: /* TODO */
248                 break;
249         case PN_ONE_CREDIT_FLOW_CONTROL:
250                 if (pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
251                                         PEP_IND_READY, priority) == 0)
252                         pn->rx_credits = 1;
253                 break;
254         case PN_MULTI_CREDIT_FLOW_CONTROL:
255                 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
256                         break;
257                 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
258                                         CREDITS_MAX - pn->rx_credits,
259                                         priority) == 0)
260                         pn->rx_credits = CREDITS_MAX;
261                 break;
262         }
263 }
264 
265 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
266 {
267         struct pep_sock *pn = pep_sk(sk);
268         struct pnpipehdr *hdr;
269         int wake = 0;
270 
271         if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
272                 return -EINVAL;
273 
274         hdr = pnp_hdr(skb);
275         if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
276                 net_dbg_ratelimited("Phonet unknown PEP type: %u\n",
277                                     (unsigned int)hdr->data[0]);
278                 return -EOPNOTSUPP;
279         }
280 
281         switch (hdr->data[1]) {
282         case PN_PEP_IND_FLOW_CONTROL:
283                 switch (pn->tx_fc) {
284                 case PN_LEGACY_FLOW_CONTROL:
285                         switch (hdr->data[4]) {
286                         case PEP_IND_BUSY:
287                                 atomic_set(&pn->tx_credits, 0);
288                                 break;
289                         case PEP_IND_READY:
290                                 atomic_set(&pn->tx_credits, wake = 1);
291                                 break;
292                         }
293                         break;
294                 case PN_ONE_CREDIT_FLOW_CONTROL:
295                         if (hdr->data[4] == PEP_IND_READY)
296                                 atomic_set(&pn->tx_credits, wake = 1);
297                         break;
298                 }
299                 break;
300 
301         case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
302                 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
303                         break;
304                 atomic_add(wake = hdr->data[4], &pn->tx_credits);
305                 break;
306 
307         default:
308                 net_dbg_ratelimited("Phonet unknown PEP indication: %u\n",
309                                     (unsigned int)hdr->data[1]);
310                 return -EOPNOTSUPP;
311         }
312         if (wake)
313                 sk->sk_write_space(sk);
314         return 0;
315 }
316 
317 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
318 {
319         struct pep_sock *pn = pep_sk(sk);
320         struct pnpipehdr *hdr = pnp_hdr(skb);
321         u8 n_sb = hdr->data[0];
322 
323         pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
324         __skb_pull(skb, sizeof(*hdr));
325         while (n_sb > 0) {
326                 u8 type, buf[2], len = sizeof(buf);
327                 u8 *data = pep_get_sb(skb, &type, &len, buf);
328 
329                 if (data == NULL)
330                         return -EINVAL;
331                 switch (type) {
332                 case PN_PIPE_SB_NEGOTIATED_FC:
333                         if (len < 2 || (data[0] | data[1]) > 3)
334                                 break;
335                         pn->tx_fc = data[0] & 3;
336                         pn->rx_fc = data[1] & 3;
337                         break;
338                 }
339                 n_sb--;
340         }
341         return 0;
342 }
343 
344 /* Queue an skb to a connected sock.
345  * Socket lock must be held. */
346 static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
347 {
348         struct pep_sock *pn = pep_sk(sk);
349         struct pnpipehdr *hdr = pnp_hdr(skb);
350         struct sk_buff_head *queue;
351         int err = 0;
352 
353         BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
354 
355         switch (hdr->message_id) {
356         case PNS_PEP_CONNECT_REQ:
357                 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_ATOMIC);
358                 break;
359 
360         case PNS_PEP_DISCONNECT_REQ:
361                 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
362                 sk->sk_state = TCP_CLOSE_WAIT;
363                 if (!sock_flag(sk, SOCK_DEAD))
364                         sk->sk_state_change(sk);
365                 break;
366 
367         case PNS_PEP_ENABLE_REQ:
368                 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
369                 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
370                 break;
371 
372         case PNS_PEP_RESET_REQ:
373                 switch (hdr->state_after_reset) {
374                 case PN_PIPE_DISABLE:
375                         pn->init_enable = 0;
376                         break;
377                 case PN_PIPE_ENABLE:
378                         pn->init_enable = 1;
379                         break;
380                 default: /* not allowed to send an error here!? */
381                         err = -EINVAL;
382                         goto out;
383                 }
384                 /* fall through */
385         case PNS_PEP_DISABLE_REQ:
386                 atomic_set(&pn->tx_credits, 0);
387                 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
388                 break;
389 
390         case PNS_PEP_CTRL_REQ:
391                 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
392                         atomic_inc(&sk->sk_drops);
393                         break;
394                 }
395                 __skb_pull(skb, 4);
396                 queue = &pn->ctrlreq_queue;
397                 goto queue;
398 
399         case PNS_PIPE_ALIGNED_DATA:
400                 __skb_pull(skb, 1);
401                 /* fall through */
402         case PNS_PIPE_DATA:
403                 __skb_pull(skb, 3); /* Pipe data header */
404                 if (!pn_flow_safe(pn->rx_fc)) {
405                         err = sock_queue_rcv_skb(sk, skb);
406                         if (!err)
407                                 return NET_RX_SUCCESS;
408                         err = -ENOBUFS;
409                         break;
410                 }
411 
412                 if (pn->rx_credits == 0) {
413                         atomic_inc(&sk->sk_drops);
414                         err = -ENOBUFS;
415                         break;
416                 }
417                 pn->rx_credits--;
418                 queue = &sk->sk_receive_queue;
419                 goto queue;
420 
421         case PNS_PEP_STATUS_IND:
422                 pipe_rcv_status(sk, skb);
423                 break;
424 
425         case PNS_PIPE_REDIRECTED_IND:
426                 err = pipe_rcv_created(sk, skb);
427                 break;
428 
429         case PNS_PIPE_CREATED_IND:
430                 err = pipe_rcv_created(sk, skb);
431                 if (err)
432                         break;
433                 /* fall through */
434         case PNS_PIPE_RESET_IND:
435                 if (!pn->init_enable)
436                         break;
437                 /* fall through */
438         case PNS_PIPE_ENABLED_IND:
439                 if (!pn_flow_safe(pn->tx_fc)) {
440                         atomic_set(&pn->tx_credits, 1);
441                         sk->sk_write_space(sk);
442                 }
443                 if (sk->sk_state == TCP_ESTABLISHED)
444                         break; /* Nothing to do */
445                 sk->sk_state = TCP_ESTABLISHED;
446                 pipe_grant_credits(sk, GFP_ATOMIC);
447                 break;
448 
449         case PNS_PIPE_DISABLED_IND:
450                 sk->sk_state = TCP_SYN_RECV;
451                 pn->rx_credits = 0;
452                 break;
453 
454         default:
455                 net_dbg_ratelimited("Phonet unknown PEP message: %u\n",
456                                     hdr->message_id);
457                 err = -EINVAL;
458         }
459 out:
460         kfree_skb(skb);
461         return (err == -ENOBUFS) ? NET_RX_DROP : NET_RX_SUCCESS;
462 
463 queue:
464         skb->dev = NULL;
465         skb_set_owner_r(skb, sk);
466         skb_queue_tail(queue, skb);
467         if (!sock_flag(sk, SOCK_DEAD))
468                 sk->sk_data_ready(sk);
469         return NET_RX_SUCCESS;
470 }
471 
472 /* Destroy connected sock. */
473 static void pipe_destruct(struct sock *sk)
474 {
475         struct pep_sock *pn = pep_sk(sk);
476 
477         skb_queue_purge(&sk->sk_receive_queue);
478         skb_queue_purge(&pn->ctrlreq_queue);
479 }
480 
481 static u8 pipe_negotiate_fc(const u8 *fcs, unsigned int n)
482 {
483         unsigned int i;
484         u8 final_fc = PN_NO_FLOW_CONTROL;
485 
486         for (i = 0; i < n; i++) {
487                 u8 fc = fcs[i];
488 
489                 if (fc > final_fc && fc < PN_MAX_FLOW_CONTROL)
490                         final_fc = fc;
491         }
492         return final_fc;
493 }
494 
495 static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb)
496 {
497         struct pep_sock *pn = pep_sk(sk);
498         struct pnpipehdr *hdr;
499         u8 n_sb;
500 
501         if (!pskb_pull(skb, sizeof(*hdr) + 4))
502                 return -EINVAL;
503 
504         hdr = pnp_hdr(skb);
505         if (hdr->error_code != PN_PIPE_NO_ERROR)
506                 return -ECONNREFUSED;
507 
508         /* Parse sub-blocks */
509         n_sb = hdr->data[4];
510         while (n_sb > 0) {
511                 u8 type, buf[6], len = sizeof(buf);
512                 const u8 *data = pep_get_sb(skb, &type, &len, buf);
513 
514                 if (data == NULL)
515                         return -EINVAL;
516 
517                 switch (type) {
518                 case PN_PIPE_SB_REQUIRED_FC_TX:
519                         if (len < 2 || len < data[0])
520                                 break;
521                         pn->tx_fc = pipe_negotiate_fc(data + 2, len - 2);
522                         break;
523 
524                 case PN_PIPE_SB_PREFERRED_FC_RX:
525                         if (len < 2 || len < data[0])
526                                 break;
527                         pn->rx_fc = pipe_negotiate_fc(data + 2, len - 2);
528                         break;
529 
530                 }
531                 n_sb--;
532         }
533 
534         return pipe_handler_send_created_ind(sk);
535 }
536 
537 static int pep_enableresp_rcv(struct sock *sk, struct sk_buff *skb)
538 {
539         struct pnpipehdr *hdr = pnp_hdr(skb);
540 
541         if (hdr->error_code != PN_PIPE_NO_ERROR)
542                 return -ECONNREFUSED;
543 
544         return pep_indicate(sk, PNS_PIPE_ENABLED_IND, 0 /* sub-blocks */,
545                 NULL, 0, GFP_ATOMIC);
546 
547 }
548 
549 static void pipe_start_flow_control(struct sock *sk)
550 {
551         struct pep_sock *pn = pep_sk(sk);
552 
553         if (!pn_flow_safe(pn->tx_fc)) {
554                 atomic_set(&pn->tx_credits, 1);
555                 sk->sk_write_space(sk);
556         }
557         pipe_grant_credits(sk, GFP_ATOMIC);
558 }
559 
560 /* Queue an skb to an actively connected sock.
561  * Socket lock must be held. */
562 static int pipe_handler_do_rcv(struct sock *sk, struct sk_buff *skb)
563 {
564         struct pep_sock *pn = pep_sk(sk);
565         struct pnpipehdr *hdr = pnp_hdr(skb);
566         int err = NET_RX_SUCCESS;
567 
568         switch (hdr->message_id) {
569         case PNS_PIPE_ALIGNED_DATA:
570                 __skb_pull(skb, 1);
571                 /* fall through */
572         case PNS_PIPE_DATA:
573                 __skb_pull(skb, 3); /* Pipe data header */
574                 if (!pn_flow_safe(pn->rx_fc)) {
575                         err = sock_queue_rcv_skb(sk, skb);
576                         if (!err)
577                                 return NET_RX_SUCCESS;
578                         err = NET_RX_DROP;
579                         break;
580                 }
581 
582                 if (pn->rx_credits == 0) {
583                         atomic_inc(&sk->sk_drops);
584                         err = NET_RX_DROP;
585                         break;
586                 }
587                 pn->rx_credits--;
588                 skb->dev = NULL;
589                 skb_set_owner_r(skb, sk);
590                 skb_queue_tail(&sk->sk_receive_queue, skb);
591                 if (!sock_flag(sk, SOCK_DEAD))
592                         sk->sk_data_ready(sk);
593                 return NET_RX_SUCCESS;
594 
595         case PNS_PEP_CONNECT_RESP:
596                 if (sk->sk_state != TCP_SYN_SENT)
597                         break;
598                 if (!sock_flag(sk, SOCK_DEAD))
599                         sk->sk_state_change(sk);
600                 if (pep_connresp_rcv(sk, skb)) {
601                         sk->sk_state = TCP_CLOSE_WAIT;
602                         break;
603                 }
604                 if (pn->init_enable == PN_PIPE_DISABLE)
605                         sk->sk_state = TCP_SYN_RECV;
606                 else {
607                         sk->sk_state = TCP_ESTABLISHED;
608                         pipe_start_flow_control(sk);
609                 }
610                 break;
611 
612         case PNS_PEP_ENABLE_RESP:
613                 if (sk->sk_state != TCP_SYN_SENT)
614                         break;
615 
616                 if (pep_enableresp_rcv(sk, skb)) {
617                         sk->sk_state = TCP_CLOSE_WAIT;
618                         break;
619                 }
620 
621                 sk->sk_state = TCP_ESTABLISHED;
622                 pipe_start_flow_control(sk);
623                 break;
624 
625         case PNS_PEP_DISCONNECT_RESP:
626                 /* sock should already be dead, nothing to do */
627                 break;
628 
629         case PNS_PEP_STATUS_IND:
630                 pipe_rcv_status(sk, skb);
631                 break;
632         }
633         kfree_skb(skb);
634         return err;
635 }
636 
637 /* Listening sock must be locked */
638 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
639                                         const struct sockaddr_pn *dst,
640                                         u8 pipe_handle)
641 {
642         struct sock *sknode;
643         u16 dobj = pn_sockaddr_get_object(dst);
644 
645         sk_for_each(sknode, hlist) {
646                 struct pep_sock *pnnode = pep_sk(sknode);
647 
648                 /* Ports match, but addresses might not: */
649                 if (pnnode->pn_sk.sobject != dobj)
650                         continue;
651                 if (pnnode->pipe_handle != pipe_handle)
652                         continue;
653                 if (sknode->sk_state == TCP_CLOSE_WAIT)
654                         continue;
655 
656                 sock_hold(sknode);
657                 return sknode;
658         }
659         return NULL;
660 }
661 
662 /*
663  * Deliver an skb to a listening sock.
664  * Socket lock must be held.
665  * We then queue the skb to the right connected sock (if any).
666  */
667 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
668 {
669         struct pep_sock *pn = pep_sk(sk);
670         struct sock *sknode;
671         struct pnpipehdr *hdr;
672         struct sockaddr_pn dst;
673         u8 pipe_handle;
674 
675         if (!pskb_may_pull(skb, sizeof(*hdr)))
676                 goto drop;
677 
678         hdr = pnp_hdr(skb);
679         pipe_handle = hdr->pipe_handle;
680         if (pipe_handle == PN_PIPE_INVALID_HANDLE)
681                 goto drop;
682 
683         pn_skb_get_dst_sockaddr(skb, &dst);
684 
685         /* Look for an existing pipe handle */
686         sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
687         if (sknode)
688                 return sk_receive_skb(sknode, skb, 1);
689 
690         switch (hdr->message_id) {
691         case PNS_PEP_CONNECT_REQ:
692                 if (sk->sk_state != TCP_LISTEN || sk_acceptq_is_full(sk)) {
693                         pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE,
694                                         GFP_ATOMIC);
695                         break;
696                 }
697                 skb_queue_head(&sk->sk_receive_queue, skb);
698                 sk_acceptq_added(sk);
699                 if (!sock_flag(sk, SOCK_DEAD))
700                         sk->sk_data_ready(sk);
701                 return NET_RX_SUCCESS;
702 
703         case PNS_PEP_DISCONNECT_REQ:
704                 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
705                 break;
706 
707         case PNS_PEP_CTRL_REQ:
708                 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
709                 break;
710 
711         case PNS_PEP_RESET_REQ:
712         case PNS_PEP_ENABLE_REQ:
713         case PNS_PEP_DISABLE_REQ:
714                 /* invalid handle is not even allowed here! */
715                 break;
716 
717         default:
718                 if ((1 << sk->sk_state)
719                                 & ~(TCPF_CLOSE|TCPF_LISTEN|TCPF_CLOSE_WAIT))
720                         /* actively connected socket */
721                         return pipe_handler_do_rcv(sk, skb);
722         }
723 drop:
724         kfree_skb(skb);
725         return NET_RX_SUCCESS;
726 }
727 
728 static int pipe_do_remove(struct sock *sk)
729 {
730         struct pep_sock *pn = pep_sk(sk);
731         struct pnpipehdr *ph;
732         struct sk_buff *skb;
733 
734         skb = pep_alloc_skb(sk, NULL, 0, GFP_KERNEL);
735         if (!skb)
736                 return -ENOMEM;
737 
738         ph = pnp_hdr(skb);
739         ph->utid = 0;
740         ph->message_id = PNS_PIPE_REMOVE_REQ;
741         ph->pipe_handle = pn->pipe_handle;
742         ph->data[0] = PAD;
743         return pn_skb_send(sk, skb, NULL);
744 }
745 
746 /* associated socket ceases to exist */
747 static void pep_sock_close(struct sock *sk, long timeout)
748 {
749         struct pep_sock *pn = pep_sk(sk);
750         int ifindex = 0;
751 
752         sock_hold(sk); /* keep a reference after sk_common_release() */
753         sk_common_release(sk);
754 
755         lock_sock(sk);
756         if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) {
757                 if (sk->sk_backlog_rcv == pipe_do_rcv)
758                         /* Forcefully remove dangling Phonet pipe */
759                         pipe_do_remove(sk);
760                 else
761                         pipe_handler_request(sk, PNS_PEP_DISCONNECT_REQ, PAD,
762                                                 NULL, 0);
763         }
764         sk->sk_state = TCP_CLOSE;
765 
766         ifindex = pn->ifindex;
767         pn->ifindex = 0;
768         release_sock(sk);
769 
770         if (ifindex)
771                 gprs_detach(sk);
772         sock_put(sk);
773 }
774 
775 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp,
776                                     bool kern)
777 {
778         struct pep_sock *pn = pep_sk(sk), *newpn;
779         struct sock *newsk = NULL;
780         struct sk_buff *skb;
781         struct pnpipehdr *hdr;
782         struct sockaddr_pn dst, src;
783         int err;
784         u16 peer_type;
785         u8 pipe_handle, enabled, n_sb;
786         u8 aligned = 0;
787 
788         skb = skb_recv_datagram(sk, 0, flags & O_NONBLOCK, errp);
789         if (!skb)
790                 return NULL;
791 
792         lock_sock(sk);
793         if (sk->sk_state != TCP_LISTEN) {
794                 err = -EINVAL;
795                 goto drop;
796         }
797         sk_acceptq_removed(sk);
798 
799         err = -EPROTO;
800         if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
801                 goto drop;
802 
803         hdr = pnp_hdr(skb);
804         pipe_handle = hdr->pipe_handle;
805         switch (hdr->state_after_connect) {
806         case PN_PIPE_DISABLE:
807                 enabled = 0;
808                 break;
809         case PN_PIPE_ENABLE:
810                 enabled = 1;
811                 break;
812         default:
813                 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM,
814                                 GFP_KERNEL);
815                 goto drop;
816         }
817         peer_type = hdr->other_pep_type << 8;
818 
819         /* Parse sub-blocks (options) */
820         n_sb = hdr->data[4];
821         while (n_sb > 0) {
822                 u8 type, buf[1], len = sizeof(buf);
823                 const u8 *data = pep_get_sb(skb, &type, &len, buf);
824 
825                 if (data == NULL)
826                         goto drop;
827                 switch (type) {
828                 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
829                         if (len < 1)
830                                 goto drop;
831                         peer_type = (peer_type & 0xff00) | data[0];
832                         break;
833                 case PN_PIPE_SB_ALIGNED_DATA:
834                         aligned = data[0] != 0;
835                         break;
836                 }
837                 n_sb--;
838         }
839 
840         /* Check for duplicate pipe handle */
841         newsk = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
842         if (unlikely(newsk)) {
843                 __sock_put(newsk);
844                 newsk = NULL;
845                 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_KERNEL);
846                 goto drop;
847         }
848 
849         /* Create a new to-be-accepted sock */
850         newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_KERNEL, sk->sk_prot,
851                          kern);
852         if (!newsk) {
853                 pep_reject_conn(sk, skb, PN_PIPE_ERR_OVERLOAD, GFP_KERNEL);
854                 err = -ENOBUFS;
855                 goto drop;
856         }
857 
858         sock_init_data(NULL, newsk);
859         newsk->sk_state = TCP_SYN_RECV;
860         newsk->sk_backlog_rcv = pipe_do_rcv;
861         newsk->sk_protocol = sk->sk_protocol;
862         newsk->sk_destruct = pipe_destruct;
863 
864         newpn = pep_sk(newsk);
865         pn_skb_get_dst_sockaddr(skb, &dst);
866         pn_skb_get_src_sockaddr(skb, &src);
867         newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
868         newpn->pn_sk.dobject = pn_sockaddr_get_object(&src);
869         newpn->pn_sk.resource = pn_sockaddr_get_resource(&dst);
870         sock_hold(sk);
871         newpn->listener = sk;
872         skb_queue_head_init(&newpn->ctrlreq_queue);
873         newpn->pipe_handle = pipe_handle;
874         atomic_set(&newpn->tx_credits, 0);
875         newpn->ifindex = 0;
876         newpn->peer_type = peer_type;
877         newpn->rx_credits = 0;
878         newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
879         newpn->init_enable = enabled;
880         newpn->aligned = aligned;
881 
882         err = pep_accept_conn(newsk, skb);
883         if (err) {
884                 sock_put(newsk);
885                 newsk = NULL;
886                 goto drop;
887         }
888         sk_add_node(newsk, &pn->hlist);
889 drop:
890         release_sock(sk);
891         kfree_skb(skb);
892         *errp = err;
893         return newsk;
894 }
895 
896 static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len)
897 {
898         struct pep_sock *pn = pep_sk(sk);
899         int err;
900         u8 data[4] = { 0 /* sub-blocks */, PAD, PAD, PAD };
901 
902         if (pn->pipe_handle == PN_PIPE_INVALID_HANDLE)
903                 pn->pipe_handle = 1; /* anything but INVALID_HANDLE */
904 
905         err = pipe_handler_request(sk, PNS_PEP_CONNECT_REQ,
906                                 pn->init_enable, data, 4);
907         if (err) {
908                 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
909                 return err;
910         }
911 
912         sk->sk_state = TCP_SYN_SENT;
913 
914         return 0;
915 }
916 
917 static int pep_sock_enable(struct sock *sk, struct sockaddr *addr, int len)
918 {
919         int err;
920 
921         err = pipe_handler_request(sk, PNS_PEP_ENABLE_REQ, PAD,
922                                 NULL, 0);
923         if (err)
924                 return err;
925 
926         sk->sk_state = TCP_SYN_SENT;
927 
928         return 0;
929 }
930 
931 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
932 {
933         struct pep_sock *pn = pep_sk(sk);
934         int answ;
935         int ret = -ENOIOCTLCMD;
936 
937         switch (cmd) {
938         case SIOCINQ:
939                 if (sk->sk_state == TCP_LISTEN) {
940                         ret = -EINVAL;
941                         break;
942                 }
943 
944                 lock_sock(sk);
945                 if (sock_flag(sk, SOCK_URGINLINE) &&
946                     !skb_queue_empty(&pn->ctrlreq_queue))
947                         answ = skb_peek(&pn->ctrlreq_queue)->len;
948                 else if (!skb_queue_empty(&sk->sk_receive_queue))
949                         answ = skb_peek(&sk->sk_receive_queue)->len;
950                 else
951                         answ = 0;
952                 release_sock(sk);
953                 ret = put_user(answ, (int __user *)arg);
954                 break;
955 
956         case SIOCPNENABLEPIPE:
957                 lock_sock(sk);
958                 if (sk->sk_state == TCP_SYN_SENT)
959                         ret =  -EBUSY;
960                 else if (sk->sk_state == TCP_ESTABLISHED)
961                         ret = -EISCONN;
962                 else
963                         ret = pep_sock_enable(sk, NULL, 0);
964                 release_sock(sk);
965                 break;
966         }
967 
968         return ret;
969 }
970 
971 static int pep_init(struct sock *sk)
972 {
973         struct pep_sock *pn = pep_sk(sk);
974 
975         sk->sk_destruct = pipe_destruct;
976         INIT_HLIST_HEAD(&pn->hlist);
977         pn->listener = NULL;
978         skb_queue_head_init(&pn->ctrlreq_queue);
979         atomic_set(&pn->tx_credits, 0);
980         pn->ifindex = 0;
981         pn->peer_type = 0;
982         pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
983         pn->rx_credits = 0;
984         pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
985         pn->init_enable = 1;
986         pn->aligned = 0;
987         return 0;
988 }
989 
990 static int pep_setsockopt(struct sock *sk, int level, int optname,
991                                 char __user *optval, unsigned int optlen)
992 {
993         struct pep_sock *pn = pep_sk(sk);
994         int val = 0, err = 0;
995 
996         if (level != SOL_PNPIPE)
997                 return -ENOPROTOOPT;
998         if (optlen >= sizeof(int)) {
999                 if (get_user(val, (int __user *) optval))
1000                         return -EFAULT;
1001         }
1002 
1003         lock_sock(sk);
1004         switch (optname) {
1005         case PNPIPE_ENCAP:
1006                 if (val && val != PNPIPE_ENCAP_IP) {
1007                         err = -EINVAL;
1008                         break;
1009                 }
1010                 if (!pn->ifindex == !val)
1011                         break; /* Nothing to do! */
1012                 if (!capable(CAP_NET_ADMIN)) {
1013                         err = -EPERM;
1014                         break;
1015                 }
1016                 if (val) {
1017                         release_sock(sk);
1018                         err = gprs_attach(sk);
1019                         if (err > 0) {
1020                                 pn->ifindex = err;
1021                                 err = 0;
1022                         }
1023                 } else {
1024                         pn->ifindex = 0;
1025                         release_sock(sk);
1026                         gprs_detach(sk);
1027                         err = 0;
1028                 }
1029                 goto out_norel;
1030 
1031         case PNPIPE_HANDLE:
1032                 if ((sk->sk_state == TCP_CLOSE) &&
1033                         (val >= 0) && (val < PN_PIPE_INVALID_HANDLE))
1034                         pn->pipe_handle = val;
1035                 else
1036                         err = -EINVAL;
1037                 break;
1038 
1039         case PNPIPE_INITSTATE:
1040                 pn->init_enable = !!val;
1041                 break;
1042 
1043         default:
1044                 err = -ENOPROTOOPT;
1045         }
1046         release_sock(sk);
1047 
1048 out_norel:
1049         return err;
1050 }
1051 
1052 static int pep_getsockopt(struct sock *sk, int level, int optname,
1053                                 char __user *optval, int __user *optlen)
1054 {
1055         struct pep_sock *pn = pep_sk(sk);
1056         int len, val;
1057 
1058         if (level != SOL_PNPIPE)
1059                 return -ENOPROTOOPT;
1060         if (get_user(len, optlen))
1061                 return -EFAULT;
1062 
1063         switch (optname) {
1064         case PNPIPE_ENCAP:
1065                 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
1066                 break;
1067 
1068         case PNPIPE_IFINDEX:
1069                 val = pn->ifindex;
1070                 break;
1071 
1072         case PNPIPE_HANDLE:
1073                 val = pn->pipe_handle;
1074                 if (val == PN_PIPE_INVALID_HANDLE)
1075                         return -EINVAL;
1076                 break;
1077 
1078         case PNPIPE_INITSTATE:
1079                 val = pn->init_enable;
1080                 break;
1081 
1082         default:
1083                 return -ENOPROTOOPT;
1084         }
1085 
1086         len = min_t(unsigned int, sizeof(int), len);
1087         if (put_user(len, optlen))
1088                 return -EFAULT;
1089         if (put_user(val, (int __user *) optval))
1090                 return -EFAULT;
1091         return 0;
1092 }
1093 
1094 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
1095 {
1096         struct pep_sock *pn = pep_sk(sk);
1097         struct pnpipehdr *ph;
1098         int err;
1099 
1100         if (pn_flow_safe(pn->tx_fc) &&
1101             !atomic_add_unless(&pn->tx_credits, -1, 0)) {
1102                 kfree_skb(skb);
1103                 return -ENOBUFS;
1104         }
1105 
1106         skb_push(skb, 3 + pn->aligned);
1107         skb_reset_transport_header(skb);
1108         ph = pnp_hdr(skb);
1109         ph->utid = 0;
1110         if (pn->aligned) {
1111                 ph->message_id = PNS_PIPE_ALIGNED_DATA;
1112                 ph->data[0] = 0; /* padding */
1113         } else
1114                 ph->message_id = PNS_PIPE_DATA;
1115         ph->pipe_handle = pn->pipe_handle;
1116         err = pn_skb_send(sk, skb, NULL);
1117 
1118         if (err && pn_flow_safe(pn->tx_fc))
1119                 atomic_inc(&pn->tx_credits);
1120         return err;
1121 
1122 }
1123 
1124 static int pep_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1125 {
1126         struct pep_sock *pn = pep_sk(sk);
1127         struct sk_buff *skb;
1128         long timeo;
1129         int flags = msg->msg_flags;
1130         int err, done;
1131 
1132         if (len > USHRT_MAX)
1133                 return -EMSGSIZE;
1134 
1135         if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
1136                                 MSG_CMSG_COMPAT)) ||
1137                         !(msg->msg_flags & MSG_EOR))
1138                 return -EOPNOTSUPP;
1139 
1140         skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
1141                                         flags & MSG_DONTWAIT, &err);
1142         if (!skb)
1143                 return err;
1144 
1145         skb_reserve(skb, MAX_PHONET_HEADER + 3 + pn->aligned);
1146         err = memcpy_from_msg(skb_put(skb, len), msg, len);
1147         if (err < 0)
1148                 goto outfree;
1149 
1150         lock_sock(sk);
1151         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1152         if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
1153                 err = -ENOTCONN;
1154                 goto out;
1155         }
1156         if (sk->sk_state != TCP_ESTABLISHED) {
1157                 /* Wait until the pipe gets to enabled state */
1158 disabled:
1159                 err = sk_stream_wait_connect(sk, &timeo);
1160                 if (err)
1161                         goto out;
1162 
1163                 if (sk->sk_state == TCP_CLOSE_WAIT) {
1164                         err = -ECONNRESET;
1165                         goto out;
1166                 }
1167         }
1168         BUG_ON(sk->sk_state != TCP_ESTABLISHED);
1169 
1170         /* Wait until flow control allows TX */
1171         done = atomic_read(&pn->tx_credits);
1172         while (!done) {
1173                 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1174 
1175                 if (!timeo) {
1176                         err = -EAGAIN;
1177                         goto out;
1178                 }
1179                 if (signal_pending(current)) {
1180                         err = sock_intr_errno(timeo);
1181                         goto out;
1182                 }
1183 
1184                 add_wait_queue(sk_sleep(sk), &wait);
1185                 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits), &wait);
1186                 remove_wait_queue(sk_sleep(sk), &wait);
1187 
1188                 if (sk->sk_state != TCP_ESTABLISHED)
1189                         goto disabled;
1190         }
1191 
1192         err = pipe_skb_send(sk, skb);
1193         if (err >= 0)
1194                 err = len; /* success! */
1195         skb = NULL;
1196 out:
1197         release_sock(sk);
1198 outfree:
1199         kfree_skb(skb);
1200         return err;
1201 }
1202 
1203 int pep_writeable(struct sock *sk)
1204 {
1205         struct pep_sock *pn = pep_sk(sk);
1206 
1207         return atomic_read(&pn->tx_credits);
1208 }
1209 
1210 int pep_write(struct sock *sk, struct sk_buff *skb)
1211 {
1212         struct sk_buff *rskb, *fs;
1213         int flen = 0;
1214 
1215         if (pep_sk(sk)->aligned)
1216                 return pipe_skb_send(sk, skb);
1217 
1218         rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
1219         if (!rskb) {
1220                 kfree_skb(skb);
1221                 return -ENOMEM;
1222         }
1223         skb_shinfo(rskb)->frag_list = skb;
1224         rskb->len += skb->len;
1225         rskb->data_len += rskb->len;
1226         rskb->truesize += rskb->len;
1227 
1228         /* Avoid nested fragments */
1229         skb_walk_frags(skb, fs)
1230                 flen += fs->len;
1231         skb->next = skb_shinfo(skb)->frag_list;
1232         skb_frag_list_init(skb);
1233         skb->len -= flen;
1234         skb->data_len -= flen;
1235         skb->truesize -= flen;
1236 
1237         skb_reserve(rskb, MAX_PHONET_HEADER + 3);
1238         return pipe_skb_send(sk, rskb);
1239 }
1240 
1241 struct sk_buff *pep_read(struct sock *sk)
1242 {
1243         struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
1244 
1245         if (sk->sk_state == TCP_ESTABLISHED)
1246                 pipe_grant_credits(sk, GFP_ATOMIC);
1247         return skb;
1248 }
1249 
1250 static int pep_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
1251                        int noblock, int flags, int *addr_len)
1252 {
1253         struct sk_buff *skb;
1254         int err;
1255 
1256         if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
1257                         MSG_NOSIGNAL|MSG_CMSG_COMPAT))
1258                 return -EOPNOTSUPP;
1259 
1260         if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
1261                 return -ENOTCONN;
1262 
1263         if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
1264                 /* Dequeue and acknowledge control request */
1265                 struct pep_sock *pn = pep_sk(sk);
1266 
1267                 if (flags & MSG_PEEK)
1268                         return -EOPNOTSUPP;
1269                 skb = skb_dequeue(&pn->ctrlreq_queue);
1270                 if (skb) {
1271                         pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
1272                                                 GFP_KERNEL);
1273                         msg->msg_flags |= MSG_OOB;
1274                         goto copy;
1275                 }
1276                 if (flags & MSG_OOB)
1277                         return -EINVAL;
1278         }
1279 
1280         skb = skb_recv_datagram(sk, flags, noblock, &err);
1281         lock_sock(sk);
1282         if (skb == NULL) {
1283                 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
1284                         err = -ECONNRESET;
1285                 release_sock(sk);
1286                 return err;
1287         }
1288 
1289         if (sk->sk_state == TCP_ESTABLISHED)
1290                 pipe_grant_credits(sk, GFP_KERNEL);
1291         release_sock(sk);
1292 copy:
1293         msg->msg_flags |= MSG_EOR;
1294         if (skb->len > len)
1295                 msg->msg_flags |= MSG_TRUNC;
1296         else
1297                 len = skb->len;
1298 
1299         err = skb_copy_datagram_msg(skb, 0, msg, len);
1300         if (!err)
1301                 err = (flags & MSG_TRUNC) ? skb->len : len;
1302 
1303         skb_free_datagram(sk, skb);
1304         return err;
1305 }
1306 
1307 static void pep_sock_unhash(struct sock *sk)
1308 {
1309         struct pep_sock *pn = pep_sk(sk);
1310         struct sock *skparent = NULL;
1311 
1312         lock_sock(sk);
1313 
1314         if (pn->listener != NULL) {
1315                 skparent = pn->listener;
1316                 pn->listener = NULL;
1317                 release_sock(sk);
1318 
1319                 pn = pep_sk(skparent);
1320                 lock_sock(skparent);
1321                 sk_del_node_init(sk);
1322                 sk = skparent;
1323         }
1324 
1325         /* Unhash a listening sock only when it is closed
1326          * and all of its active connected pipes are closed. */
1327         if (hlist_empty(&pn->hlist))
1328                 pn_sock_unhash(&pn->pn_sk.sk);
1329         release_sock(sk);
1330 
1331         if (skparent)
1332                 sock_put(skparent);
1333 }
1334 
1335 static struct proto pep_proto = {
1336         .close          = pep_sock_close,
1337         .accept         = pep_sock_accept,
1338         .connect        = pep_sock_connect,
1339         .ioctl          = pep_ioctl,
1340         .init           = pep_init,
1341         .setsockopt     = pep_setsockopt,
1342         .getsockopt     = pep_getsockopt,
1343         .sendmsg        = pep_sendmsg,
1344         .recvmsg        = pep_recvmsg,
1345         .backlog_rcv    = pep_do_rcv,
1346         .hash           = pn_sock_hash,
1347         .unhash         = pep_sock_unhash,
1348         .get_port       = pn_sock_get_port,
1349         .obj_size       = sizeof(struct pep_sock),
1350         .owner          = THIS_MODULE,
1351         .name           = "PNPIPE",
1352 };
1353 
1354 static struct phonet_protocol pep_pn_proto = {
1355         .ops            = &phonet_stream_ops,
1356         .prot           = &pep_proto,
1357         .sock_type      = SOCK_SEQPACKET,
1358 };
1359 
1360 static int __init pep_register(void)
1361 {
1362         return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1363 }
1364 
1365 static void __exit pep_unregister(void)
1366 {
1367         phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1368 }
1369 
1370 module_init(pep_register);
1371 module_exit(pep_unregister);
1372 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1373 MODULE_DESCRIPTION("Phonet pipe protocol");
1374 MODULE_LICENSE("GPL");
1375 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);
1376 

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