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Linux/net/decnet/af_decnet.c

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  1 
  2 /*
  3  * DECnet       An implementation of the DECnet protocol suite for the LINUX
  4  *              operating system.  DECnet is implemented using the  BSD Socket
  5  *              interface as the means of communication with the user level.
  6  *
  7  *              DECnet Socket Layer Interface
  8  *
  9  * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
 10  *              Patrick Caulfield <patrick@pandh.demon.co.uk>
 11  *
 12  * Changes:
 13  *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
 14  *                          version of the code. Original copyright preserved
 15  *                          below.
 16  *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
 17  *                          compatible with my routing layer.
 18  *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
 19  *                          Caulfield.
 20  *        Steve Whitehouse: Further bug fixes, checking module code still works
 21  *                          with new routing layer.
 22  *        Steve Whitehouse: Additional set/get_sockopt() calls.
 23  *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
 24  *                          code.
 25  *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
 26  *                          way. Didn't manage it entirely, but its better.
 27  *        Steve Whitehouse: ditto for sendmsg().
 28  *        Steve Whitehouse: A selection of bug fixes to various things.
 29  *        Steve Whitehouse: Added TIOCOUTQ ioctl.
 30  *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
 31  *        Steve Whitehouse: Fixes to connect() error returns.
 32  *       Patrick Caulfield: Fixes to delayed acceptance logic.
 33  *         David S. Miller: New socket locking
 34  *        Steve Whitehouse: Socket list hashing/locking
 35  *         Arnaldo C. Melo: use capable, not suser
 36  *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
 37  *                          when required.
 38  *       Patrick Caulfield: /proc/net/decnet now has object name/number
 39  *        Steve Whitehouse: Fixed local port allocation, hashed sk list
 40  *          Matthew Wilcox: Fixes for dn_ioctl()
 41  *        Steve Whitehouse: New connect/accept logic to allow timeouts and
 42  *                          prepare for sendpage etc.
 43  */
 44 
 45 
 46 /******************************************************************************
 47     (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
 48 
 49     This program is free software; you can redistribute it and/or modify
 50     it under the terms of the GNU General Public License as published by
 51     the Free Software Foundation; either version 2 of the License, or
 52     any later version.
 53 
 54     This program is distributed in the hope that it will be useful,
 55     but WITHOUT ANY WARRANTY; without even the implied warranty of
 56     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 57     GNU General Public License for more details.
 58 
 59 HISTORY:
 60 
 61 Version           Kernel     Date       Author/Comments
 62 -------           ------     ----       ---------------
 63 Version 0.0.1     2.0.30    01-dic-97   Eduardo Marcelo Serrat
 64                                         (emserrat@geocities.com)
 65 
 66                                         First Development of DECnet Socket La-
 67                                         yer for Linux. Only supports outgoing
 68                                         connections.
 69 
 70 Version 0.0.2     2.1.105   20-jun-98   Patrick J. Caulfield
 71                                         (patrick@pandh.demon.co.uk)
 72 
 73                                         Port to new kernel development version.
 74 
 75 Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
 76                                         (emserrat@geocities.com)
 77                                         _
 78                                         Added support for incoming connections
 79                                         so we can start developing server apps
 80                                         on Linux.
 81                                         -
 82                                         Module Support
 83 Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
 84                                        (emserrat@geocities.com)
 85                                        _
 86                                         Added support for X11R6.4. Now we can
 87                                         use DECnet transport for X on Linux!!!
 88                                        -
 89 Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
 90                                        (emserrat@geocities.com)
 91                                        Removed bugs on flow control
 92                                        Removed bugs on incoming accessdata
 93                                        order
 94                                        -
 95 Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
 96                                        dn_recvmsg fixes
 97 
 98                                         Patrick J. Caulfield
 99                                        dn_bind fixes
100 *******************************************************************************/
101 
102 #include <linux/module.h>
103 #include <linux/errno.h>
104 #include <linux/types.h>
105 #include <linux/slab.h>
106 #include <linux/socket.h>
107 #include <linux/in.h>
108 #include <linux/kernel.h>
109 #include <linux/sched.h>
110 #include <linux/timer.h>
111 #include <linux/string.h>
112 #include <linux/sockios.h>
113 #include <linux/net.h>
114 #include <linux/netdevice.h>
115 #include <linux/inet.h>
116 #include <linux/route.h>
117 #include <linux/netfilter.h>
118 #include <linux/seq_file.h>
119 #include <net/sock.h>
120 #include <net/tcp_states.h>
121 #include <net/flow.h>
122 #include <asm/ioctls.h>
123 #include <linux/capability.h>
124 #include <linux/mm.h>
125 #include <linux/interrupt.h>
126 #include <linux/proc_fs.h>
127 #include <linux/stat.h>
128 #include <linux/init.h>
129 #include <linux/poll.h>
130 #include <net/net_namespace.h>
131 #include <net/neighbour.h>
132 #include <net/dst.h>
133 #include <net/fib_rules.h>
134 #include <net/dn.h>
135 #include <net/dn_nsp.h>
136 #include <net/dn_dev.h>
137 #include <net/dn_route.h>
138 #include <net/dn_fib.h>
139 #include <net/dn_neigh.h>
140 
141 struct dn_sock {
142         struct sock sk;
143         struct dn_scp scp;
144 };
145 
146 static void dn_keepalive(struct sock *sk);
147 
148 #define DN_SK_HASH_SHIFT 8
149 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
150 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
151 
152 
153 static const struct proto_ops dn_proto_ops;
154 static DEFINE_RWLOCK(dn_hash_lock);
155 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
156 static struct hlist_head dn_wild_sk;
157 static atomic_long_t decnet_memory_allocated;
158 
159 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
160 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
161 
162 static struct hlist_head *dn_find_list(struct sock *sk)
163 {
164         struct dn_scp *scp = DN_SK(sk);
165 
166         if (scp->addr.sdn_flags & SDF_WILD)
167                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
168 
169         return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
170 }
171 
172 /*
173  * Valid ports are those greater than zero and not already in use.
174  */
175 static int check_port(__le16 port)
176 {
177         struct sock *sk;
178 
179         if (port == 0)
180                 return -1;
181 
182         sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
183                 struct dn_scp *scp = DN_SK(sk);
184                 if (scp->addrloc == port)
185                         return -1;
186         }
187         return 0;
188 }
189 
190 static unsigned short port_alloc(struct sock *sk)
191 {
192         struct dn_scp *scp = DN_SK(sk);
193 static unsigned short port = 0x2000;
194         unsigned short i_port = port;
195 
196         while(check_port(cpu_to_le16(++port)) != 0) {
197                 if (port == i_port)
198                         return 0;
199         }
200 
201         scp->addrloc = cpu_to_le16(port);
202 
203         return 1;
204 }
205 
206 /*
207  * Since this is only ever called from user
208  * level, we don't need a write_lock() version
209  * of this.
210  */
211 static int dn_hash_sock(struct sock *sk)
212 {
213         struct dn_scp *scp = DN_SK(sk);
214         struct hlist_head *list;
215         int rv = -EUSERS;
216 
217         BUG_ON(sk_hashed(sk));
218 
219         write_lock_bh(&dn_hash_lock);
220 
221         if (!scp->addrloc && !port_alloc(sk))
222                 goto out;
223 
224         rv = -EADDRINUSE;
225         if ((list = dn_find_list(sk)) == NULL)
226                 goto out;
227 
228         sk_add_node(sk, list);
229         rv = 0;
230 out:
231         write_unlock_bh(&dn_hash_lock);
232         return rv;
233 }
234 
235 static void dn_unhash_sock(struct sock *sk)
236 {
237         write_lock(&dn_hash_lock);
238         sk_del_node_init(sk);
239         write_unlock(&dn_hash_lock);
240 }
241 
242 static void dn_unhash_sock_bh(struct sock *sk)
243 {
244         write_lock_bh(&dn_hash_lock);
245         sk_del_node_init(sk);
246         write_unlock_bh(&dn_hash_lock);
247 }
248 
249 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
250 {
251         int i;
252         unsigned int hash = addr->sdn_objnum;
253 
254         if (hash == 0) {
255                 hash = addr->sdn_objnamel;
256                 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
257                         hash ^= addr->sdn_objname[i];
258                         hash ^= (hash << 3);
259                 }
260         }
261 
262         return &dn_sk_hash[hash & DN_SK_HASH_MASK];
263 }
264 
265 /*
266  * Called to transform a socket from bound (i.e. with a local address)
267  * into a listening socket (doesn't need a local port number) and rehashes
268  * based upon the object name/number.
269  */
270 static void dn_rehash_sock(struct sock *sk)
271 {
272         struct hlist_head *list;
273         struct dn_scp *scp = DN_SK(sk);
274 
275         if (scp->addr.sdn_flags & SDF_WILD)
276                 return;
277 
278         write_lock_bh(&dn_hash_lock);
279         sk_del_node_init(sk);
280         DN_SK(sk)->addrloc = 0;
281         list = listen_hash(&DN_SK(sk)->addr);
282         sk_add_node(sk, list);
283         write_unlock_bh(&dn_hash_lock);
284 }
285 
286 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
287 {
288         int len = 2;
289 
290         *buf++ = type;
291 
292         switch (type) {
293         case 0:
294                 *buf++ = sdn->sdn_objnum;
295                 break;
296         case 1:
297                 *buf++ = 0;
298                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
299                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
300                 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
301                 break;
302         case 2:
303                 memset(buf, 0, 5);
304                 buf += 5;
305                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
306                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
307                 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
308                 break;
309         }
310 
311         return len;
312 }
313 
314 /*
315  * On reception of usernames, we handle types 1 and 0 for destination
316  * addresses only. Types 2 and 4 are used for source addresses, but the
317  * UIC, GIC are ignored and they are both treated the same way. Type 3
318  * is never used as I've no idea what its purpose might be or what its
319  * format is.
320  */
321 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
322 {
323         unsigned char type;
324         int size = len;
325         int namel = 12;
326 
327         sdn->sdn_objnum = 0;
328         sdn->sdn_objnamel = cpu_to_le16(0);
329         memset(sdn->sdn_objname, 0, DN_MAXOBJL);
330 
331         if (len < 2)
332                 return -1;
333 
334         len -= 2;
335         *fmt = *data++;
336         type = *data++;
337 
338         switch (*fmt) {
339         case 0:
340                 sdn->sdn_objnum = type;
341                 return 2;
342         case 1:
343                 namel = 16;
344                 break;
345         case 2:
346                 len  -= 4;
347                 data += 4;
348                 break;
349         case 4:
350                 len  -= 8;
351                 data += 8;
352                 break;
353         default:
354                 return -1;
355         }
356 
357         len -= 1;
358 
359         if (len < 0)
360                 return -1;
361 
362         sdn->sdn_objnamel = cpu_to_le16(*data++);
363         len -= le16_to_cpu(sdn->sdn_objnamel);
364 
365         if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
366                 return -1;
367 
368         memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
369 
370         return size - len;
371 }
372 
373 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
374 {
375         struct hlist_head *list = listen_hash(addr);
376         struct sock *sk;
377 
378         read_lock(&dn_hash_lock);
379         sk_for_each(sk, list) {
380                 struct dn_scp *scp = DN_SK(sk);
381                 if (sk->sk_state != TCP_LISTEN)
382                         continue;
383                 if (scp->addr.sdn_objnum) {
384                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
385                                 continue;
386                 } else {
387                         if (addr->sdn_objnum)
388                                 continue;
389                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
390                                 continue;
391                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
392                                 continue;
393                 }
394                 sock_hold(sk);
395                 read_unlock(&dn_hash_lock);
396                 return sk;
397         }
398 
399         sk = sk_head(&dn_wild_sk);
400         if (sk) {
401                 if (sk->sk_state == TCP_LISTEN)
402                         sock_hold(sk);
403                 else
404                         sk = NULL;
405         }
406 
407         read_unlock(&dn_hash_lock);
408         return sk;
409 }
410 
411 struct sock *dn_find_by_skb(struct sk_buff *skb)
412 {
413         struct dn_skb_cb *cb = DN_SKB_CB(skb);
414         struct sock *sk;
415         struct dn_scp *scp;
416 
417         read_lock(&dn_hash_lock);
418         sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
419                 scp = DN_SK(sk);
420                 if (cb->src != dn_saddr2dn(&scp->peer))
421                         continue;
422                 if (cb->dst_port != scp->addrloc)
423                         continue;
424                 if (scp->addrrem && (cb->src_port != scp->addrrem))
425                         continue;
426                 sock_hold(sk);
427                 goto found;
428         }
429         sk = NULL;
430 found:
431         read_unlock(&dn_hash_lock);
432         return sk;
433 }
434 
435 
436 
437 static void dn_destruct(struct sock *sk)
438 {
439         struct dn_scp *scp = DN_SK(sk);
440 
441         skb_queue_purge(&scp->data_xmit_queue);
442         skb_queue_purge(&scp->other_xmit_queue);
443         skb_queue_purge(&scp->other_receive_queue);
444 
445         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
446 }
447 
448 static int dn_memory_pressure;
449 
450 static void dn_enter_memory_pressure(struct sock *sk)
451 {
452         if (!dn_memory_pressure) {
453                 dn_memory_pressure = 1;
454         }
455 }
456 
457 static struct proto dn_proto = {
458         .name                   = "NSP",
459         .owner                  = THIS_MODULE,
460         .enter_memory_pressure  = dn_enter_memory_pressure,
461         .memory_pressure        = &dn_memory_pressure,
462         .memory_allocated       = &decnet_memory_allocated,
463         .sysctl_mem             = sysctl_decnet_mem,
464         .sysctl_wmem            = sysctl_decnet_wmem,
465         .sysctl_rmem            = sysctl_decnet_rmem,
466         .max_header             = DN_MAX_NSP_DATA_HEADER + 64,
467         .obj_size               = sizeof(struct dn_sock),
468 };
469 
470 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
471 {
472         struct dn_scp *scp;
473         struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
474 
475         if  (!sk)
476                 goto out;
477 
478         if (sock)
479                 sock->ops = &dn_proto_ops;
480         sock_init_data(sock, sk);
481 
482         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
483         sk->sk_destruct    = dn_destruct;
484         sk->sk_no_check    = 1;
485         sk->sk_family      = PF_DECnet;
486         sk->sk_protocol    = 0;
487         sk->sk_allocation  = gfp;
488         sk->sk_sndbuf      = sysctl_decnet_wmem[1];
489         sk->sk_rcvbuf      = sysctl_decnet_rmem[1];
490 
491         /* Initialization of DECnet Session Control Port                */
492         scp = DN_SK(sk);
493         scp->state      = DN_O;         /* Open                 */
494         scp->numdat     = 1;            /* Next data seg to tx  */
495         scp->numoth     = 1;            /* Next oth data to tx  */
496         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
497         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
498         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
499         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
500         scp->flowrem_sw = DN_SEND;
501         scp->flowloc_sw = DN_SEND;
502         scp->flowrem_dat = 0;
503         scp->flowrem_oth = 1;
504         scp->flowloc_dat = 0;
505         scp->flowloc_oth = 1;
506         scp->services_rem = 0;
507         scp->services_loc = 1 | NSP_FC_NONE;
508         scp->info_rem = 0;
509         scp->info_loc = 0x03; /* NSP version 4.1 */
510         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
511         scp->nonagle = 0;
512         scp->multi_ireq = 1;
513         scp->accept_mode = ACC_IMMED;
514         scp->addr.sdn_family    = AF_DECnet;
515         scp->peer.sdn_family    = AF_DECnet;
516         scp->accessdata.acc_accl = 5;
517         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
518 
519         scp->max_window   = NSP_MAX_WINDOW;
520         scp->snd_window   = NSP_MIN_WINDOW;
521         scp->nsp_srtt     = NSP_INITIAL_SRTT;
522         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
523         scp->nsp_rxtshift = 0;
524 
525         skb_queue_head_init(&scp->data_xmit_queue);
526         skb_queue_head_init(&scp->other_xmit_queue);
527         skb_queue_head_init(&scp->other_receive_queue);
528 
529         scp->persist = 0;
530         scp->persist_fxn = NULL;
531         scp->keepalive = 10 * HZ;
532         scp->keepalive_fxn = dn_keepalive;
533 
534         init_timer(&scp->delack_timer);
535         scp->delack_pending = 0;
536         scp->delack_fxn = dn_nsp_delayed_ack;
537 
538         dn_start_slow_timer(sk);
539 out:
540         return sk;
541 }
542 
543 /*
544  * Keepalive timer.
545  * FIXME: Should respond to SO_KEEPALIVE etc.
546  */
547 static void dn_keepalive(struct sock *sk)
548 {
549         struct dn_scp *scp = DN_SK(sk);
550 
551         /*
552          * By checking the other_data transmit queue is empty
553          * we are double checking that we are not sending too
554          * many of these keepalive frames.
555          */
556         if (skb_queue_empty(&scp->other_xmit_queue))
557                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
558 }
559 
560 
561 /*
562  * Timer for shutdown/destroyed sockets.
563  * When socket is dead & no packets have been sent for a
564  * certain amount of time, they are removed by this
565  * routine. Also takes care of sending out DI & DC
566  * frames at correct times.
567  */
568 int dn_destroy_timer(struct sock *sk)
569 {
570         struct dn_scp *scp = DN_SK(sk);
571 
572         scp->persist = dn_nsp_persist(sk);
573 
574         switch (scp->state) {
575         case DN_DI:
576                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
577                 if (scp->nsp_rxtshift >= decnet_di_count)
578                         scp->state = DN_CN;
579                 return 0;
580 
581         case DN_DR:
582                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
583                 if (scp->nsp_rxtshift >= decnet_dr_count)
584                         scp->state = DN_DRC;
585                 return 0;
586 
587         case DN_DN:
588                 if (scp->nsp_rxtshift < decnet_dn_count) {
589                         /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
590                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
591                                          GFP_ATOMIC);
592                         return 0;
593                 }
594         }
595 
596         scp->persist = (HZ * decnet_time_wait);
597 
598         if (sk->sk_socket)
599                 return 0;
600 
601         if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
602                 dn_unhash_sock(sk);
603                 sock_put(sk);
604                 return 1;
605         }
606 
607         return 0;
608 }
609 
610 static void dn_destroy_sock(struct sock *sk)
611 {
612         struct dn_scp *scp = DN_SK(sk);
613 
614         scp->nsp_rxtshift = 0; /* reset back off */
615 
616         if (sk->sk_socket) {
617                 if (sk->sk_socket->state != SS_UNCONNECTED)
618                         sk->sk_socket->state = SS_DISCONNECTING;
619         }
620 
621         sk->sk_state = TCP_CLOSE;
622 
623         switch (scp->state) {
624         case DN_DN:
625                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
626                                  sk->sk_allocation);
627                 scp->persist_fxn = dn_destroy_timer;
628                 scp->persist = dn_nsp_persist(sk);
629                 break;
630         case DN_CR:
631                 scp->state = DN_DR;
632                 goto disc_reject;
633         case DN_RUN:
634                 scp->state = DN_DI;
635         case DN_DI:
636         case DN_DR:
637 disc_reject:
638                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
639         case DN_NC:
640         case DN_NR:
641         case DN_RJ:
642         case DN_DIC:
643         case DN_CN:
644         case DN_DRC:
645         case DN_CI:
646         case DN_CD:
647                 scp->persist_fxn = dn_destroy_timer;
648                 scp->persist = dn_nsp_persist(sk);
649                 break;
650         default:
651                 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
652         case DN_O:
653                 dn_stop_slow_timer(sk);
654 
655                 dn_unhash_sock_bh(sk);
656                 sock_put(sk);
657 
658                 break;
659         }
660 }
661 
662 char *dn_addr2asc(__u16 addr, char *buf)
663 {
664         unsigned short node, area;
665 
666         node = addr & 0x03ff;
667         area = addr >> 10;
668         sprintf(buf, "%hd.%hd", area, node);
669 
670         return buf;
671 }
672 
673 
674 
675 static int dn_create(struct net *net, struct socket *sock, int protocol,
676                      int kern)
677 {
678         struct sock *sk;
679 
680         if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
681                 return -EINVAL;
682 
683         if (!net_eq(net, &init_net))
684                 return -EAFNOSUPPORT;
685 
686         switch (sock->type) {
687         case SOCK_SEQPACKET:
688                 if (protocol != DNPROTO_NSP)
689                         return -EPROTONOSUPPORT;
690                 break;
691         case SOCK_STREAM:
692                 break;
693         default:
694                 return -ESOCKTNOSUPPORT;
695         }
696 
697 
698         if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
699                 return -ENOBUFS;
700 
701         sk->sk_protocol = protocol;
702 
703         return 0;
704 }
705 
706 
707 static int
708 dn_release(struct socket *sock)
709 {
710         struct sock *sk = sock->sk;
711 
712         if (sk) {
713                 sock_orphan(sk);
714                 sock_hold(sk);
715                 lock_sock(sk);
716                 dn_destroy_sock(sk);
717                 release_sock(sk);
718                 sock_put(sk);
719         }
720 
721         return 0;
722 }
723 
724 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
725 {
726         struct sock *sk = sock->sk;
727         struct dn_scp *scp = DN_SK(sk);
728         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
729         struct net_device *dev, *ldev;
730         int rv;
731 
732         if (addr_len != sizeof(struct sockaddr_dn))
733                 return -EINVAL;
734 
735         if (saddr->sdn_family != AF_DECnet)
736                 return -EINVAL;
737 
738         if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
739                 return -EINVAL;
740 
741         if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
742                 return -EINVAL;
743 
744         if (saddr->sdn_flags & ~SDF_WILD)
745                 return -EINVAL;
746 
747         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
748             (saddr->sdn_flags & SDF_WILD)))
749                 return -EACCES;
750 
751         if (!(saddr->sdn_flags & SDF_WILD)) {
752                 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
753                         rcu_read_lock();
754                         ldev = NULL;
755                         for_each_netdev_rcu(&init_net, dev) {
756                                 if (!dev->dn_ptr)
757                                         continue;
758                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
759                                         ldev = dev;
760                                         break;
761                                 }
762                         }
763                         rcu_read_unlock();
764                         if (ldev == NULL)
765                                 return -EADDRNOTAVAIL;
766                 }
767         }
768 
769         rv = -EINVAL;
770         lock_sock(sk);
771         if (sock_flag(sk, SOCK_ZAPPED)) {
772                 memcpy(&scp->addr, saddr, addr_len);
773                 sock_reset_flag(sk, SOCK_ZAPPED);
774 
775                 rv = dn_hash_sock(sk);
776                 if (rv)
777                         sock_set_flag(sk, SOCK_ZAPPED);
778         }
779         release_sock(sk);
780 
781         return rv;
782 }
783 
784 
785 static int dn_auto_bind(struct socket *sock)
786 {
787         struct sock *sk = sock->sk;
788         struct dn_scp *scp = DN_SK(sk);
789         int rv;
790 
791         sock_reset_flag(sk, SOCK_ZAPPED);
792 
793         scp->addr.sdn_flags  = 0;
794         scp->addr.sdn_objnum = 0;
795 
796         /*
797          * This stuff is to keep compatibility with Eduardo's
798          * patch. I hope I can dispense with it shortly...
799          */
800         if ((scp->accessdata.acc_accl != 0) &&
801                 (scp->accessdata.acc_accl <= 12)) {
802 
803                 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
804                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
805 
806                 scp->accessdata.acc_accl = 0;
807                 memset(scp->accessdata.acc_acc, 0, 40);
808         }
809         /* End of compatibility stuff */
810 
811         scp->addr.sdn_add.a_len = cpu_to_le16(2);
812         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
813         if (rv == 0) {
814                 rv = dn_hash_sock(sk);
815                 if (rv)
816                         sock_set_flag(sk, SOCK_ZAPPED);
817         }
818 
819         return rv;
820 }
821 
822 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
823 {
824         struct dn_scp *scp = DN_SK(sk);
825         DEFINE_WAIT(wait);
826         int err;
827 
828         if (scp->state != DN_CR)
829                 return -EINVAL;
830 
831         scp->state = DN_CC;
832         scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
833         dn_send_conn_conf(sk, allocation);
834 
835         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
836         for(;;) {
837                 release_sock(sk);
838                 if (scp->state == DN_CC)
839                         *timeo = schedule_timeout(*timeo);
840                 lock_sock(sk);
841                 err = 0;
842                 if (scp->state == DN_RUN)
843                         break;
844                 err = sock_error(sk);
845                 if (err)
846                         break;
847                 err = sock_intr_errno(*timeo);
848                 if (signal_pending(current))
849                         break;
850                 err = -EAGAIN;
851                 if (!*timeo)
852                         break;
853                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
854         }
855         finish_wait(sk_sleep(sk), &wait);
856         if (err == 0) {
857                 sk->sk_socket->state = SS_CONNECTED;
858         } else if (scp->state != DN_CC) {
859                 sk->sk_socket->state = SS_UNCONNECTED;
860         }
861         return err;
862 }
863 
864 static int dn_wait_run(struct sock *sk, long *timeo)
865 {
866         struct dn_scp *scp = DN_SK(sk);
867         DEFINE_WAIT(wait);
868         int err = 0;
869 
870         if (scp->state == DN_RUN)
871                 goto out;
872 
873         if (!*timeo)
874                 return -EALREADY;
875 
876         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
877         for(;;) {
878                 release_sock(sk);
879                 if (scp->state == DN_CI || scp->state == DN_CC)
880                         *timeo = schedule_timeout(*timeo);
881                 lock_sock(sk);
882                 err = 0;
883                 if (scp->state == DN_RUN)
884                         break;
885                 err = sock_error(sk);
886                 if (err)
887                         break;
888                 err = sock_intr_errno(*timeo);
889                 if (signal_pending(current))
890                         break;
891                 err = -ETIMEDOUT;
892                 if (!*timeo)
893                         break;
894                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
895         }
896         finish_wait(sk_sleep(sk), &wait);
897 out:
898         if (err == 0) {
899                 sk->sk_socket->state = SS_CONNECTED;
900         } else if (scp->state != DN_CI && scp->state != DN_CC) {
901                 sk->sk_socket->state = SS_UNCONNECTED;
902         }
903         return err;
904 }
905 
906 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
907 {
908         struct socket *sock = sk->sk_socket;
909         struct dn_scp *scp = DN_SK(sk);
910         int err = -EISCONN;
911         struct flowidn fld;
912         struct dst_entry *dst;
913 
914         if (sock->state == SS_CONNECTED)
915                 goto out;
916 
917         if (sock->state == SS_CONNECTING) {
918                 err = 0;
919                 if (scp->state == DN_RUN) {
920                         sock->state = SS_CONNECTED;
921                         goto out;
922                 }
923                 err = -ECONNREFUSED;
924                 if (scp->state != DN_CI && scp->state != DN_CC) {
925                         sock->state = SS_UNCONNECTED;
926                         goto out;
927                 }
928                 return dn_wait_run(sk, timeo);
929         }
930 
931         err = -EINVAL;
932         if (scp->state != DN_O)
933                 goto out;
934 
935         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
936                 goto out;
937         if (addr->sdn_family != AF_DECnet)
938                 goto out;
939         if (addr->sdn_flags & SDF_WILD)
940                 goto out;
941 
942         if (sock_flag(sk, SOCK_ZAPPED)) {
943                 err = dn_auto_bind(sk->sk_socket);
944                 if (err)
945                         goto out;
946         }
947 
948         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
949 
950         err = -EHOSTUNREACH;
951         memset(&fld, 0, sizeof(fld));
952         fld.flowidn_oif = sk->sk_bound_dev_if;
953         fld.daddr = dn_saddr2dn(&scp->peer);
954         fld.saddr = dn_saddr2dn(&scp->addr);
955         dn_sk_ports_copy(&fld, scp);
956         fld.flowidn_proto = DNPROTO_NSP;
957         if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
958                 goto out;
959         dst = __sk_dst_get(sk);
960         sk->sk_route_caps = dst->dev->features;
961         sock->state = SS_CONNECTING;
962         scp->state = DN_CI;
963         scp->segsize_loc = dst_metric_advmss(dst);
964 
965         dn_nsp_send_conninit(sk, NSP_CI);
966         err = -EINPROGRESS;
967         if (*timeo) {
968                 err = dn_wait_run(sk, timeo);
969         }
970 out:
971         return err;
972 }
973 
974 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
975 {
976         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
977         struct sock *sk = sock->sk;
978         int err;
979         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
980 
981         lock_sock(sk);
982         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
983         release_sock(sk);
984 
985         return err;
986 }
987 
988 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
989 {
990         struct dn_scp *scp = DN_SK(sk);
991 
992         switch (scp->state) {
993         case DN_RUN:
994                 return 0;
995         case DN_CR:
996                 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
997         case DN_CI:
998         case DN_CC:
999                 return dn_wait_run(sk, timeo);
1000         case DN_O:
1001                 return __dn_connect(sk, addr, addrlen, timeo, flags);
1002         }
1003 
1004         return -EINVAL;
1005 }
1006 
1007 
1008 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1009 {
1010         unsigned char *ptr = skb->data;
1011 
1012         acc->acc_userl = *ptr++;
1013         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1014         ptr += acc->acc_userl;
1015 
1016         acc->acc_passl = *ptr++;
1017         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1018         ptr += acc->acc_passl;
1019 
1020         acc->acc_accl = *ptr++;
1021         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1022 
1023         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1024 
1025 }
1026 
1027 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1028 {
1029         unsigned char *ptr = skb->data;
1030         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1031 
1032         BUG_ON(len > 16); /* we've checked the contents earlier */
1033         opt->opt_optl   = cpu_to_le16(len);
1034         opt->opt_status = 0;
1035         memcpy(opt->opt_data, ptr, len);
1036         skb_pull(skb, len + 1);
1037 }
1038 
1039 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1040 {
1041         DEFINE_WAIT(wait);
1042         struct sk_buff *skb = NULL;
1043         int err = 0;
1044 
1045         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1046         for(;;) {
1047                 release_sock(sk);
1048                 skb = skb_dequeue(&sk->sk_receive_queue);
1049                 if (skb == NULL) {
1050                         *timeo = schedule_timeout(*timeo);
1051                         skb = skb_dequeue(&sk->sk_receive_queue);
1052                 }
1053                 lock_sock(sk);
1054                 if (skb != NULL)
1055                         break;
1056                 err = -EINVAL;
1057                 if (sk->sk_state != TCP_LISTEN)
1058                         break;
1059                 err = sock_intr_errno(*timeo);
1060                 if (signal_pending(current))
1061                         break;
1062                 err = -EAGAIN;
1063                 if (!*timeo)
1064                         break;
1065                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1066         }
1067         finish_wait(sk_sleep(sk), &wait);
1068 
1069         return skb == NULL ? ERR_PTR(err) : skb;
1070 }
1071 
1072 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1073 {
1074         struct sock *sk = sock->sk, *newsk;
1075         struct sk_buff *skb = NULL;
1076         struct dn_skb_cb *cb;
1077         unsigned char menuver;
1078         int err = 0;
1079         unsigned char type;
1080         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1081         struct dst_entry *dst;
1082 
1083         lock_sock(sk);
1084 
1085         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1086                 release_sock(sk);
1087                 return -EINVAL;
1088         }
1089 
1090         skb = skb_dequeue(&sk->sk_receive_queue);
1091         if (skb == NULL) {
1092                 skb = dn_wait_for_connect(sk, &timeo);
1093                 if (IS_ERR(skb)) {
1094                         release_sock(sk);
1095                         return PTR_ERR(skb);
1096                 }
1097         }
1098 
1099         cb = DN_SKB_CB(skb);
1100         sk->sk_ack_backlog--;
1101         newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1102         if (newsk == NULL) {
1103                 release_sock(sk);
1104                 kfree_skb(skb);
1105                 return -ENOBUFS;
1106         }
1107         release_sock(sk);
1108 
1109         dst = skb_dst(skb);
1110         sk_dst_set(newsk, dst);
1111         skb_dst_set(skb, NULL);
1112 
1113         DN_SK(newsk)->state        = DN_CR;
1114         DN_SK(newsk)->addrrem      = cb->src_port;
1115         DN_SK(newsk)->services_rem = cb->services;
1116         DN_SK(newsk)->info_rem     = cb->info;
1117         DN_SK(newsk)->segsize_rem  = cb->segsize;
1118         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1119 
1120         if (DN_SK(newsk)->segsize_rem < 230)
1121                 DN_SK(newsk)->segsize_rem = 230;
1122 
1123         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1124                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1125 
1126         newsk->sk_state  = TCP_LISTEN;
1127         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1128 
1129         /*
1130          * If we are listening on a wild socket, we don't want
1131          * the newly created socket on the wrong hash queue.
1132          */
1133         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1134 
1135         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1136         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1137         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1138         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1139 
1140         menuver = *skb->data;
1141         skb_pull(skb, 1);
1142 
1143         if (menuver & DN_MENUVER_ACC)
1144                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1145 
1146         if (menuver & DN_MENUVER_USR)
1147                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1148 
1149         if (menuver & DN_MENUVER_PRX)
1150                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1151 
1152         if (menuver & DN_MENUVER_UIC)
1153                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1154 
1155         kfree_skb(skb);
1156 
1157         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1158                 sizeof(struct optdata_dn));
1159         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1160                 sizeof(struct optdata_dn));
1161 
1162         lock_sock(newsk);
1163         err = dn_hash_sock(newsk);
1164         if (err == 0) {
1165                 sock_reset_flag(newsk, SOCK_ZAPPED);
1166                 dn_send_conn_ack(newsk);
1167 
1168                 /*
1169                  * Here we use sk->sk_allocation since although the conn conf is
1170                  * for the newsk, the context is the old socket.
1171                  */
1172                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1173                         err = dn_confirm_accept(newsk, &timeo,
1174                                                 sk->sk_allocation);
1175         }
1176         release_sock(newsk);
1177         return err;
1178 }
1179 
1180 
1181 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1182 {
1183         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1184         struct sock *sk = sock->sk;
1185         struct dn_scp *scp = DN_SK(sk);
1186 
1187         *uaddr_len = sizeof(struct sockaddr_dn);
1188 
1189         lock_sock(sk);
1190 
1191         if (peer) {
1192                 if ((sock->state != SS_CONNECTED &&
1193                      sock->state != SS_CONNECTING) &&
1194                     scp->accept_mode == ACC_IMMED) {
1195                         release_sock(sk);
1196                         return -ENOTCONN;
1197                 }
1198 
1199                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1200         } else {
1201                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1202         }
1203 
1204         release_sock(sk);
1205 
1206         return 0;
1207 }
1208 
1209 
1210 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1211 {
1212         struct sock *sk = sock->sk;
1213         struct dn_scp *scp = DN_SK(sk);
1214         int mask = datagram_poll(file, sock, wait);
1215 
1216         if (!skb_queue_empty(&scp->other_receive_queue))
1217                 mask |= POLLRDBAND;
1218 
1219         return mask;
1220 }
1221 
1222 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1223 {
1224         struct sock *sk = sock->sk;
1225         struct dn_scp *scp = DN_SK(sk);
1226         int err = -EOPNOTSUPP;
1227         long amount = 0;
1228         struct sk_buff *skb;
1229         int val;
1230 
1231         switch(cmd)
1232         {
1233         case SIOCGIFADDR:
1234         case SIOCSIFADDR:
1235                 return dn_dev_ioctl(cmd, (void __user *)arg);
1236 
1237         case SIOCATMARK:
1238                 lock_sock(sk);
1239                 val = !skb_queue_empty(&scp->other_receive_queue);
1240                 if (scp->state != DN_RUN)
1241                         val = -ENOTCONN;
1242                 release_sock(sk);
1243                 return val;
1244 
1245         case TIOCOUTQ:
1246                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1247                 if (amount < 0)
1248                         amount = 0;
1249                 err = put_user(amount, (int __user *)arg);
1250                 break;
1251 
1252         case TIOCINQ:
1253                 lock_sock(sk);
1254                 skb = skb_peek(&scp->other_receive_queue);
1255                 if (skb) {
1256                         amount = skb->len;
1257                 } else {
1258                         skb_queue_walk(&sk->sk_receive_queue, skb)
1259                                 amount += skb->len;
1260                 }
1261                 release_sock(sk);
1262                 err = put_user(amount, (int __user *)arg);
1263                 break;
1264 
1265         default:
1266                 err = -ENOIOCTLCMD;
1267                 break;
1268         }
1269 
1270         return err;
1271 }
1272 
1273 static int dn_listen(struct socket *sock, int backlog)
1274 {
1275         struct sock *sk = sock->sk;
1276         int err = -EINVAL;
1277 
1278         lock_sock(sk);
1279 
1280         if (sock_flag(sk, SOCK_ZAPPED))
1281                 goto out;
1282 
1283         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1284                 goto out;
1285 
1286         sk->sk_max_ack_backlog = backlog;
1287         sk->sk_ack_backlog     = 0;
1288         sk->sk_state           = TCP_LISTEN;
1289         err                 = 0;
1290         dn_rehash_sock(sk);
1291 
1292 out:
1293         release_sock(sk);
1294 
1295         return err;
1296 }
1297 
1298 
1299 static int dn_shutdown(struct socket *sock, int how)
1300 {
1301         struct sock *sk = sock->sk;
1302         struct dn_scp *scp = DN_SK(sk);
1303         int err = -ENOTCONN;
1304 
1305         lock_sock(sk);
1306 
1307         if (sock->state == SS_UNCONNECTED)
1308                 goto out;
1309 
1310         err = 0;
1311         if (sock->state == SS_DISCONNECTING)
1312                 goto out;
1313 
1314         err = -EINVAL;
1315         if (scp->state == DN_O)
1316                 goto out;
1317 
1318         if (how != SHUT_RDWR)
1319                 goto out;
1320 
1321         sk->sk_shutdown = SHUTDOWN_MASK;
1322         dn_destroy_sock(sk);
1323         err = 0;
1324 
1325 out:
1326         release_sock(sk);
1327 
1328         return err;
1329 }
1330 
1331 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1332 {
1333         struct sock *sk = sock->sk;
1334         int err;
1335 
1336         lock_sock(sk);
1337         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1338         release_sock(sk);
1339 
1340         return err;
1341 }
1342 
1343 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1344 {
1345         struct  sock *sk = sock->sk;
1346         struct dn_scp *scp = DN_SK(sk);
1347         long timeo;
1348         union {
1349                 struct optdata_dn opt;
1350                 struct accessdata_dn acc;
1351                 int mode;
1352                 unsigned long win;
1353                 int val;
1354                 unsigned char services;
1355                 unsigned char info;
1356         } u;
1357         int err;
1358 
1359         if (optlen && !optval)
1360                 return -EINVAL;
1361 
1362         if (optlen > sizeof(u))
1363                 return -EINVAL;
1364 
1365         if (copy_from_user(&u, optval, optlen))
1366                 return -EFAULT;
1367 
1368         switch (optname) {
1369         case DSO_CONDATA:
1370                 if (sock->state == SS_CONNECTED)
1371                         return -EISCONN;
1372                 if ((scp->state != DN_O) && (scp->state != DN_CR))
1373                         return -EINVAL;
1374 
1375                 if (optlen != sizeof(struct optdata_dn))
1376                         return -EINVAL;
1377 
1378                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1379                         return -EINVAL;
1380 
1381                 memcpy(&scp->conndata_out, &u.opt, optlen);
1382                 break;
1383 
1384         case DSO_DISDATA:
1385                 if (sock->state != SS_CONNECTED &&
1386                     scp->accept_mode == ACC_IMMED)
1387                         return -ENOTCONN;
1388 
1389                 if (optlen != sizeof(struct optdata_dn))
1390                         return -EINVAL;
1391 
1392                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1393                         return -EINVAL;
1394 
1395                 memcpy(&scp->discdata_out, &u.opt, optlen);
1396                 break;
1397 
1398         case DSO_CONACCESS:
1399                 if (sock->state == SS_CONNECTED)
1400                         return -EISCONN;
1401                 if (scp->state != DN_O)
1402                         return -EINVAL;
1403 
1404                 if (optlen != sizeof(struct accessdata_dn))
1405                         return -EINVAL;
1406 
1407                 if ((u.acc.acc_accl > DN_MAXACCL) ||
1408                     (u.acc.acc_passl > DN_MAXACCL) ||
1409                     (u.acc.acc_userl > DN_MAXACCL))
1410                         return -EINVAL;
1411 
1412                 memcpy(&scp->accessdata, &u.acc, optlen);
1413                 break;
1414 
1415         case DSO_ACCEPTMODE:
1416                 if (sock->state == SS_CONNECTED)
1417                         return -EISCONN;
1418                 if (scp->state != DN_O)
1419                         return -EINVAL;
1420 
1421                 if (optlen != sizeof(int))
1422                         return -EINVAL;
1423 
1424                 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1425                         return -EINVAL;
1426 
1427                 scp->accept_mode = (unsigned char)u.mode;
1428                 break;
1429 
1430         case DSO_CONACCEPT:
1431                 if (scp->state != DN_CR)
1432                         return -EINVAL;
1433                 timeo = sock_rcvtimeo(sk, 0);
1434                 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1435                 return err;
1436 
1437         case DSO_CONREJECT:
1438                 if (scp->state != DN_CR)
1439                         return -EINVAL;
1440 
1441                 scp->state = DN_DR;
1442                 sk->sk_shutdown = SHUTDOWN_MASK;
1443                 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1444                 break;
1445 
1446         default:
1447 #ifdef CONFIG_NETFILTER
1448                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1449 #endif
1450         case DSO_LINKINFO:
1451         case DSO_STREAM:
1452         case DSO_SEQPACKET:
1453                 return -ENOPROTOOPT;
1454 
1455         case DSO_MAXWINDOW:
1456                 if (optlen != sizeof(unsigned long))
1457                         return -EINVAL;
1458                 if (u.win > NSP_MAX_WINDOW)
1459                         u.win = NSP_MAX_WINDOW;
1460                 if (u.win == 0)
1461                         return -EINVAL;
1462                 scp->max_window = u.win;
1463                 if (scp->snd_window > u.win)
1464                         scp->snd_window = u.win;
1465                 break;
1466 
1467         case DSO_NODELAY:
1468                 if (optlen != sizeof(int))
1469                         return -EINVAL;
1470                 if (scp->nonagle == 2)
1471                         return -EINVAL;
1472                 scp->nonagle = (u.val == 0) ? 0 : 1;
1473                 /* if (scp->nonagle == 1) { Push pending frames } */
1474                 break;
1475 
1476         case DSO_CORK:
1477                 if (optlen != sizeof(int))
1478                         return -EINVAL;
1479                 if (scp->nonagle == 1)
1480                         return -EINVAL;
1481                 scp->nonagle = (u.val == 0) ? 0 : 2;
1482                 /* if (scp->nonagle == 0) { Push pending frames } */
1483                 break;
1484 
1485         case DSO_SERVICES:
1486                 if (optlen != sizeof(unsigned char))
1487                         return -EINVAL;
1488                 if ((u.services & ~NSP_FC_MASK) != 0x01)
1489                         return -EINVAL;
1490                 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1491                         return -EINVAL;
1492                 scp->services_loc = u.services;
1493                 break;
1494 
1495         case DSO_INFO:
1496                 if (optlen != sizeof(unsigned char))
1497                         return -EINVAL;
1498                 if (u.info & 0xfc)
1499                         return -EINVAL;
1500                 scp->info_loc = u.info;
1501                 break;
1502         }
1503 
1504         return 0;
1505 }
1506 
1507 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1508 {
1509         struct sock *sk = sock->sk;
1510         int err;
1511 
1512         lock_sock(sk);
1513         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1514         release_sock(sk);
1515 
1516         return err;
1517 }
1518 
1519 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1520 {
1521         struct  sock *sk = sock->sk;
1522         struct dn_scp *scp = DN_SK(sk);
1523         struct linkinfo_dn link;
1524         unsigned int r_len;
1525         void *r_data = NULL;
1526         unsigned int val;
1527 
1528         if(get_user(r_len , optlen))
1529                 return -EFAULT;
1530 
1531         switch (optname) {
1532         case DSO_CONDATA:
1533                 if (r_len > sizeof(struct optdata_dn))
1534                         r_len = sizeof(struct optdata_dn);
1535                 r_data = &scp->conndata_in;
1536                 break;
1537 
1538         case DSO_DISDATA:
1539                 if (r_len > sizeof(struct optdata_dn))
1540                         r_len = sizeof(struct optdata_dn);
1541                 r_data = &scp->discdata_in;
1542                 break;
1543 
1544         case DSO_CONACCESS:
1545                 if (r_len > sizeof(struct accessdata_dn))
1546                         r_len = sizeof(struct accessdata_dn);
1547                 r_data = &scp->accessdata;
1548                 break;
1549 
1550         case DSO_ACCEPTMODE:
1551                 if (r_len > sizeof(unsigned char))
1552                         r_len = sizeof(unsigned char);
1553                 r_data = &scp->accept_mode;
1554                 break;
1555 
1556         case DSO_LINKINFO:
1557                 if (r_len > sizeof(struct linkinfo_dn))
1558                         r_len = sizeof(struct linkinfo_dn);
1559 
1560                 memset(&link, 0, sizeof(link));
1561 
1562                 switch (sock->state) {
1563                 case SS_CONNECTING:
1564                         link.idn_linkstate = LL_CONNECTING;
1565                         break;
1566                 case SS_DISCONNECTING:
1567                         link.idn_linkstate = LL_DISCONNECTING;
1568                         break;
1569                 case SS_CONNECTED:
1570                         link.idn_linkstate = LL_RUNNING;
1571                         break;
1572                 default:
1573                         link.idn_linkstate = LL_INACTIVE;
1574                 }
1575 
1576                 link.idn_segsize = scp->segsize_rem;
1577                 r_data = &link;
1578                 break;
1579 
1580         default:
1581 #ifdef CONFIG_NETFILTER
1582         {
1583                 int ret, len;
1584 
1585                 if (get_user(len, optlen))
1586                         return -EFAULT;
1587 
1588                 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1589                 if (ret >= 0)
1590                         ret = put_user(len, optlen);
1591                 return ret;
1592         }
1593 #endif
1594         case DSO_STREAM:
1595         case DSO_SEQPACKET:
1596         case DSO_CONACCEPT:
1597         case DSO_CONREJECT:
1598                 return -ENOPROTOOPT;
1599 
1600         case DSO_MAXWINDOW:
1601                 if (r_len > sizeof(unsigned long))
1602                         r_len = sizeof(unsigned long);
1603                 r_data = &scp->max_window;
1604                 break;
1605 
1606         case DSO_NODELAY:
1607                 if (r_len > sizeof(int))
1608                         r_len = sizeof(int);
1609                 val = (scp->nonagle == 1);
1610                 r_data = &val;
1611                 break;
1612 
1613         case DSO_CORK:
1614                 if (r_len > sizeof(int))
1615                         r_len = sizeof(int);
1616                 val = (scp->nonagle == 2);
1617                 r_data = &val;
1618                 break;
1619 
1620         case DSO_SERVICES:
1621                 if (r_len > sizeof(unsigned char))
1622                         r_len = sizeof(unsigned char);
1623                 r_data = &scp->services_rem;
1624                 break;
1625 
1626         case DSO_INFO:
1627                 if (r_len > sizeof(unsigned char))
1628                         r_len = sizeof(unsigned char);
1629                 r_data = &scp->info_rem;
1630                 break;
1631         }
1632 
1633         if (r_data) {
1634                 if (copy_to_user(optval, r_data, r_len))
1635                         return -EFAULT;
1636                 if (put_user(r_len, optlen))
1637                         return -EFAULT;
1638         }
1639 
1640         return 0;
1641 }
1642 
1643 
1644 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1645 {
1646         struct sk_buff *skb;
1647         int len = 0;
1648 
1649         if (flags & MSG_OOB)
1650                 return !skb_queue_empty(q) ? 1 : 0;
1651 
1652         skb_queue_walk(q, skb) {
1653                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1654                 len += skb->len;
1655 
1656                 if (cb->nsp_flags & 0x40) {
1657                         /* SOCK_SEQPACKET reads to EOM */
1658                         if (sk->sk_type == SOCK_SEQPACKET)
1659                                 return 1;
1660                         /* so does SOCK_STREAM unless WAITALL is specified */
1661                         if (!(flags & MSG_WAITALL))
1662                                 return 1;
1663                 }
1664 
1665                 /* minimum data length for read exceeded */
1666                 if (len >= target)
1667                         return 1;
1668         }
1669 
1670         return 0;
1671 }
1672 
1673 
1674 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1675         struct msghdr *msg, size_t size, int flags)
1676 {
1677         struct sock *sk = sock->sk;
1678         struct dn_scp *scp = DN_SK(sk);
1679         struct sk_buff_head *queue = &sk->sk_receive_queue;
1680         size_t target = size > 1 ? 1 : 0;
1681         size_t copied = 0;
1682         int rv = 0;
1683         struct sk_buff *skb, *n;
1684         struct dn_skb_cb *cb = NULL;
1685         unsigned char eor = 0;
1686         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1687 
1688         lock_sock(sk);
1689 
1690         if (sock_flag(sk, SOCK_ZAPPED)) {
1691                 rv = -EADDRNOTAVAIL;
1692                 goto out;
1693         }
1694 
1695         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1696                 rv = 0;
1697                 goto out;
1698         }
1699 
1700         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1701         if (rv)
1702                 goto out;
1703 
1704         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1705                 rv = -EOPNOTSUPP;
1706                 goto out;
1707         }
1708 
1709         if (flags & MSG_OOB)
1710                 queue = &scp->other_receive_queue;
1711 
1712         if (flags & MSG_WAITALL)
1713                 target = size;
1714 
1715 
1716         /*
1717          * See if there is data ready to read, sleep if there isn't
1718          */
1719         for(;;) {
1720                 DEFINE_WAIT(wait);
1721 
1722                 if (sk->sk_err)
1723                         goto out;
1724 
1725                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1726                         if (!(flags & MSG_OOB)) {
1727                                 msg->msg_flags |= MSG_OOB;
1728                                 if (!scp->other_report) {
1729                                         scp->other_report = 1;
1730                                         goto out;
1731                                 }
1732                         }
1733                 }
1734 
1735                 if (scp->state != DN_RUN)
1736                         goto out;
1737 
1738                 if (signal_pending(current)) {
1739                         rv = sock_intr_errno(timeo);
1740                         goto out;
1741                 }
1742 
1743                 if (dn_data_ready(sk, queue, flags, target))
1744                         break;
1745 
1746                 if (flags & MSG_DONTWAIT) {
1747                         rv = -EWOULDBLOCK;
1748                         goto out;
1749                 }
1750 
1751                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1752                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1753                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1754                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1755                 finish_wait(sk_sleep(sk), &wait);
1756         }
1757 
1758         skb_queue_walk_safe(queue, skb, n) {
1759                 unsigned int chunk = skb->len;
1760                 cb = DN_SKB_CB(skb);
1761 
1762                 if ((chunk + copied) > size)
1763                         chunk = size - copied;
1764 
1765                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1766                         rv = -EFAULT;
1767                         break;
1768                 }
1769                 copied += chunk;
1770 
1771                 if (!(flags & MSG_PEEK))
1772                         skb_pull(skb, chunk);
1773 
1774                 eor = cb->nsp_flags & 0x40;
1775 
1776                 if (skb->len == 0) {
1777                         skb_unlink(skb, queue);
1778                         kfree_skb(skb);
1779                         /*
1780                          * N.B. Don't refer to skb or cb after this point
1781                          * in loop.
1782                          */
1783                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1784                                 scp->flowloc_sw = DN_SEND;
1785                                 dn_nsp_send_link(sk, DN_SEND, 0);
1786                         }
1787                 }
1788 
1789                 if (eor) {
1790                         if (sk->sk_type == SOCK_SEQPACKET)
1791                                 break;
1792                         if (!(flags & MSG_WAITALL))
1793                                 break;
1794                 }
1795 
1796                 if (flags & MSG_OOB)
1797                         break;
1798 
1799                 if (copied >= target)
1800                         break;
1801         }
1802 
1803         rv = copied;
1804 
1805 
1806         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1807                 msg->msg_flags |= MSG_EOR;
1808 
1809 out:
1810         if (rv == 0)
1811                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1812 
1813         if ((rv >= 0) && msg->msg_name) {
1814                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1815                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1816         }
1817 
1818         release_sock(sk);
1819 
1820         return rv;
1821 }
1822 
1823 
1824 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1825 {
1826         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1827         if (skb_queue_len(queue) >= scp->snd_window)
1828                 return 1;
1829         if (fctype != NSP_FC_NONE) {
1830                 if (flags & MSG_OOB) {
1831                         if (scp->flowrem_oth == 0)
1832                                 return 1;
1833                 } else {
1834                         if (scp->flowrem_dat == 0)
1835                                 return 1;
1836                 }
1837         }
1838         return 0;
1839 }
1840 
1841 /*
1842  * The DECnet spec requires that the "routing layer" accepts packets which
1843  * are at least 230 bytes in size. This excludes any headers which the NSP
1844  * layer might add, so we always assume that we'll be using the maximal
1845  * length header on data packets. The variation in length is due to the
1846  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1847  * make much practical difference.
1848  */
1849 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1850 {
1851         unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1852         if (dev) {
1853                 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1854                 mtu -= LL_RESERVED_SPACE(dev);
1855                 if (dn_db->use_long)
1856                         mtu -= 21;
1857                 else
1858                         mtu -= 6;
1859                 mtu -= DN_MAX_NSP_DATA_HEADER;
1860         } else {
1861                 /*
1862                  * 21 = long header, 16 = guess at MAC header length
1863                  */
1864                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1865         }
1866         if (mtu > mss)
1867                 mss = mtu;
1868         return mss;
1869 }
1870 
1871 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1872 {
1873         struct dst_entry *dst = __sk_dst_get(sk);
1874         struct dn_scp *scp = DN_SK(sk);
1875         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1876 
1877         /* Other data messages are limited to 16 bytes per packet */
1878         if (flags & MSG_OOB)
1879                 return 16;
1880 
1881         /* This works out the maximum size of segment we can send out */
1882         if (dst) {
1883                 u32 mtu = dst_mtu(dst);
1884                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1885         }
1886 
1887         return mss_now;
1888 }
1889 
1890 /*
1891  * N.B. We get the timeout wrong here, but then we always did get it
1892  * wrong before and this is another step along the road to correcting
1893  * it. It ought to get updated each time we pass through the routine,
1894  * but in practise it probably doesn't matter too much for now.
1895  */
1896 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1897                               unsigned long datalen, int noblock,
1898                               int *errcode)
1899 {
1900         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1901                                                    noblock, errcode);
1902         if (skb) {
1903                 skb->protocol = htons(ETH_P_DNA_RT);
1904                 skb->pkt_type = PACKET_OUTGOING;
1905         }
1906         return skb;
1907 }
1908 
1909 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1910                       struct msghdr *msg, size_t size)
1911 {
1912         struct sock *sk = sock->sk;
1913         struct dn_scp *scp = DN_SK(sk);
1914         size_t mss;
1915         struct sk_buff_head *queue = &scp->data_xmit_queue;
1916         int flags = msg->msg_flags;
1917         int err = 0;
1918         size_t sent = 0;
1919         int addr_len = msg->msg_namelen;
1920         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1921         struct sk_buff *skb = NULL;
1922         struct dn_skb_cb *cb;
1923         size_t len;
1924         unsigned char fctype;
1925         long timeo;
1926 
1927         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1928                 return -EOPNOTSUPP;
1929 
1930         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1931                 return -EINVAL;
1932 
1933         lock_sock(sk);
1934         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1935         /*
1936          * The only difference between stream sockets and sequenced packet
1937          * sockets is that the stream sockets always behave as if MSG_EOR
1938          * has been set.
1939          */
1940         if (sock->type == SOCK_STREAM) {
1941                 if (flags & MSG_EOR) {
1942                         err = -EINVAL;
1943                         goto out;
1944                 }
1945                 flags |= MSG_EOR;
1946         }
1947 
1948 
1949         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1950         if (err)
1951                 goto out_err;
1952 
1953         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1954                 err = -EPIPE;
1955                 if (!(flags & MSG_NOSIGNAL))
1956                         send_sig(SIGPIPE, current, 0);
1957                 goto out_err;
1958         }
1959 
1960         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1961                 dst_negative_advice(sk);
1962 
1963         mss = scp->segsize_rem;
1964         fctype = scp->services_rem & NSP_FC_MASK;
1965 
1966         mss = dn_current_mss(sk, flags);
1967 
1968         if (flags & MSG_OOB) {
1969                 queue = &scp->other_xmit_queue;
1970                 if (size > mss) {
1971                         err = -EMSGSIZE;
1972                         goto out;
1973                 }
1974         }
1975 
1976         scp->persist_fxn = dn_nsp_xmit_timeout;
1977 
1978         while(sent < size) {
1979                 err = sock_error(sk);
1980                 if (err)
1981                         goto out;
1982 
1983                 if (signal_pending(current)) {
1984                         err = sock_intr_errno(timeo);
1985                         goto out;
1986                 }
1987 
1988                 /*
1989                  * Calculate size that we wish to send.
1990                  */
1991                 len = size - sent;
1992 
1993                 if (len > mss)
1994                         len = mss;
1995 
1996                 /*
1997                  * Wait for queue size to go down below the window
1998                  * size.
1999                  */
2000                 if (dn_queue_too_long(scp, queue, flags)) {
2001                         DEFINE_WAIT(wait);
2002 
2003                         if (flags & MSG_DONTWAIT) {
2004                                 err = -EWOULDBLOCK;
2005                                 goto out;
2006                         }
2007 
2008                         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2009                         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2010                         sk_wait_event(sk, &timeo,
2011                                       !dn_queue_too_long(scp, queue, flags));
2012                         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2013                         finish_wait(sk_sleep(sk), &wait);
2014                         continue;
2015                 }
2016 
2017                 /*
2018                  * Get a suitably sized skb.
2019                  * 64 is a bit of a hack really, but its larger than any
2020                  * link-layer headers and has served us well as a good
2021                  * guess as to their real length.
2022                  */
2023                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2024                                          flags & MSG_DONTWAIT, &err);
2025 
2026                 if (err)
2027                         break;
2028 
2029                 if (!skb)
2030                         continue;
2031 
2032                 cb = DN_SKB_CB(skb);
2033 
2034                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2035 
2036                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2037                         err = -EFAULT;
2038                         goto out;
2039                 }
2040 
2041                 if (flags & MSG_OOB) {
2042                         cb->nsp_flags = 0x30;
2043                         if (fctype != NSP_FC_NONE)
2044                                 scp->flowrem_oth--;
2045                 } else {
2046                         cb->nsp_flags = 0x00;
2047                         if (scp->seg_total == 0)
2048                                 cb->nsp_flags |= 0x20;
2049 
2050                         scp->seg_total += len;
2051 
2052                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2053                                 cb->nsp_flags |= 0x40;
2054                                 scp->seg_total = 0;
2055                                 if (fctype == NSP_FC_SCMC)
2056                                         scp->flowrem_dat--;
2057                         }
2058                         if (fctype == NSP_FC_SRC)
2059                                 scp->flowrem_dat--;
2060                 }
2061 
2062                 sent += len;
2063                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2064                 skb = NULL;
2065 
2066                 scp->persist = dn_nsp_persist(sk);
2067 
2068         }
2069 out:
2070 
2071         kfree_skb(skb);
2072 
2073         release_sock(sk);
2074 
2075         return sent ? sent : err;
2076 
2077 out_err:
2078         err = sk_stream_error(sk, flags, err);
2079         release_sock(sk);
2080         return err;
2081 }
2082 
2083 static int dn_device_event(struct notifier_block *this, unsigned long event,
2084                            void *ptr)
2085 {
2086         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2087 
2088         if (!net_eq(dev_net(dev), &init_net))
2089                 return NOTIFY_DONE;
2090 
2091         switch (event) {
2092         case NETDEV_UP:
2093                 dn_dev_up(dev);
2094                 break;
2095         case NETDEV_DOWN:
2096                 dn_dev_down(dev);
2097                 break;
2098         default:
2099                 break;
2100         }
2101 
2102         return NOTIFY_DONE;
2103 }
2104 
2105 static struct notifier_block dn_dev_notifier = {
2106         .notifier_call = dn_device_event,
2107 };
2108 
2109 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2110 
2111 static struct packet_type dn_dix_packet_type __read_mostly = {
2112         .type =         cpu_to_be16(ETH_P_DNA_RT),
2113         .func =         dn_route_rcv,
2114 };
2115 
2116 #ifdef CONFIG_PROC_FS
2117 struct dn_iter_state {
2118         int bucket;
2119 };
2120 
2121 static struct sock *dn_socket_get_first(struct seq_file *seq)
2122 {
2123         struct dn_iter_state *state = seq->private;
2124         struct sock *n = NULL;
2125 
2126         for(state->bucket = 0;
2127             state->bucket < DN_SK_HASH_SIZE;
2128             ++state->bucket) {
2129                 n = sk_head(&dn_sk_hash[state->bucket]);
2130                 if (n)
2131                         break;
2132         }
2133 
2134         return n;
2135 }
2136 
2137 static struct sock *dn_socket_get_next(struct seq_file *seq,
2138                                        struct sock *n)
2139 {
2140         struct dn_iter_state *state = seq->private;
2141 
2142         n = sk_next(n);
2143 try_again:
2144         if (n)
2145                 goto out;
2146         if (++state->bucket >= DN_SK_HASH_SIZE)
2147                 goto out;
2148         n = sk_head(&dn_sk_hash[state->bucket]);
2149         goto try_again;
2150 out:
2151         return n;
2152 }
2153 
2154 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2155 {
2156         struct sock *sk = dn_socket_get_first(seq);
2157 
2158         if (sk) {
2159                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2160                         --*pos;
2161         }
2162         return *pos ? NULL : sk;
2163 }
2164 
2165 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2166 {
2167         void *rc;
2168         read_lock_bh(&dn_hash_lock);
2169         rc = socket_get_idx(seq, &pos);
2170         if (!rc) {
2171                 read_unlock_bh(&dn_hash_lock);
2172         }
2173         return rc;
2174 }
2175 
2176 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2177 {
2178         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2179 }
2180 
2181 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2182 {
2183         void *rc;
2184 
2185         if (v == SEQ_START_TOKEN) {
2186                 rc = dn_socket_get_idx(seq, 0);
2187                 goto out;
2188         }
2189 
2190         rc = dn_socket_get_next(seq, v);
2191         if (rc)
2192                 goto out;
2193         read_unlock_bh(&dn_hash_lock);
2194 out:
2195         ++*pos;
2196         return rc;
2197 }
2198 
2199 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2200 {
2201         if (v && v != SEQ_START_TOKEN)
2202                 read_unlock_bh(&dn_hash_lock);
2203 }
2204 
2205 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2206 
2207 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2208 {
2209         int i;
2210 
2211         switch (le16_to_cpu(dn->sdn_objnamel)) {
2212         case 0:
2213                 sprintf(buf, "%d", dn->sdn_objnum);
2214                 break;
2215         default:
2216                 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2217                         buf[i] = dn->sdn_objname[i];
2218                         if (IS_NOT_PRINTABLE(buf[i]))
2219                                 buf[i] = '.';
2220                 }
2221                 buf[i] = 0;
2222         }
2223 }
2224 
2225 static char *dn_state2asc(unsigned char state)
2226 {
2227         switch (state) {
2228         case DN_O:
2229                 return "OPEN";
2230         case DN_CR:
2231                 return "  CR";
2232         case DN_DR:
2233                 return "  DR";
2234         case DN_DRC:
2235                 return " DRC";
2236         case DN_CC:
2237                 return "  CC";
2238         case DN_CI:
2239                 return "  CI";
2240         case DN_NR:
2241                 return "  NR";
2242         case DN_NC:
2243                 return "  NC";
2244         case DN_CD:
2245                 return "  CD";
2246         case DN_RJ:
2247                 return "  RJ";
2248         case DN_RUN:
2249                 return " RUN";
2250         case DN_DI:
2251                 return "  DI";
2252         case DN_DIC:
2253                 return " DIC";
2254         case DN_DN:
2255                 return "  DN";
2256         case DN_CL:
2257                 return "  CL";
2258         case DN_CN:
2259                 return "  CN";
2260         }
2261 
2262         return "????";
2263 }
2264 
2265 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2266 {
2267         struct dn_scp *scp = DN_SK(sk);
2268         char buf1[DN_ASCBUF_LEN];
2269         char buf2[DN_ASCBUF_LEN];
2270         char local_object[DN_MAXOBJL+3];
2271         char remote_object[DN_MAXOBJL+3];
2272 
2273         dn_printable_object(&scp->addr, local_object);
2274         dn_printable_object(&scp->peer, remote_object);
2275 
2276         seq_printf(seq,
2277                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2278                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2279                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2280                    scp->addrloc,
2281                    scp->numdat,
2282                    scp->numoth,
2283                    scp->ackxmt_dat,
2284                    scp->ackxmt_oth,
2285                    scp->flowloc_sw,
2286                    local_object,
2287                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2288                    scp->addrrem,
2289                    scp->numdat_rcv,
2290                    scp->numoth_rcv,
2291                    scp->ackrcv_dat,
2292                    scp->ackrcv_oth,
2293                    scp->flowrem_sw,
2294                    remote_object,
2295                    dn_state2asc(scp->state),
2296                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2297 }
2298 
2299 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2300 {
2301         if (v == SEQ_START_TOKEN) {
2302                 seq_puts(seq, "Local                                              Remote\n");
2303         } else {
2304                 dn_socket_format_entry(seq, v);
2305         }
2306         return 0;
2307 }
2308 
2309 static const struct seq_operations dn_socket_seq_ops = {
2310         .start  = dn_socket_seq_start,
2311         .next   = dn_socket_seq_next,
2312         .stop   = dn_socket_seq_stop,
2313         .show   = dn_socket_seq_show,
2314 };
2315 
2316 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2317 {
2318         return seq_open_private(file, &dn_socket_seq_ops,
2319                         sizeof(struct dn_iter_state));
2320 }
2321 
2322 static const struct file_operations dn_socket_seq_fops = {
2323         .owner          = THIS_MODULE,
2324         .open           = dn_socket_seq_open,
2325         .read           = seq_read,
2326         .llseek         = seq_lseek,
2327         .release        = seq_release_private,
2328 };
2329 #endif
2330 
2331 static const struct net_proto_family    dn_family_ops = {
2332         .family =       AF_DECnet,
2333         .create =       dn_create,
2334         .owner  =       THIS_MODULE,
2335 };
2336 
2337 static const struct proto_ops dn_proto_ops = {
2338         .family =       AF_DECnet,
2339         .owner =        THIS_MODULE,
2340         .release =      dn_release,
2341         .bind =         dn_bind,
2342         .connect =      dn_connect,
2343         .socketpair =   sock_no_socketpair,
2344         .accept =       dn_accept,
2345         .getname =      dn_getname,
2346         .poll =         dn_poll,
2347         .ioctl =        dn_ioctl,
2348         .listen =       dn_listen,
2349         .shutdown =     dn_shutdown,
2350         .setsockopt =   dn_setsockopt,
2351         .getsockopt =   dn_getsockopt,
2352         .sendmsg =      dn_sendmsg,
2353         .recvmsg =      dn_recvmsg,
2354         .mmap =         sock_no_mmap,
2355         .sendpage =     sock_no_sendpage,
2356 };
2357 
2358 void dn_register_sysctl(void);
2359 void dn_unregister_sysctl(void);
2360 
2361 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2362 MODULE_AUTHOR("Linux DECnet Project Team");
2363 MODULE_LICENSE("GPL");
2364 MODULE_ALIAS_NETPROTO(PF_DECnet);
2365 
2366 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2367 
2368 static int __init decnet_init(void)
2369 {
2370         int rc;
2371 
2372         printk(banner);
2373 
2374         rc = proto_register(&dn_proto, 1);
2375         if (rc != 0)
2376                 goto out;
2377 
2378         dn_neigh_init();
2379         dn_dev_init();
2380         dn_route_init();
2381         dn_fib_init();
2382 
2383         sock_register(&dn_family_ops);
2384         dev_add_pack(&dn_dix_packet_type);
2385         register_netdevice_notifier(&dn_dev_notifier);
2386 
2387         proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
2388         dn_register_sysctl();
2389 out:
2390         return rc;
2391 
2392 }
2393 module_init(decnet_init);
2394 
2395 /*
2396  * Prevent DECnet module unloading until its fixed properly.
2397  * Requires an audit of the code to check for memory leaks and
2398  * initialisation problems etc.
2399  */
2400 #if 0
2401 static void __exit decnet_exit(void)
2402 {
2403         sock_unregister(AF_DECnet);
2404         rtnl_unregister_all(PF_DECnet);
2405         dev_remove_pack(&dn_dix_packet_type);
2406 
2407         dn_unregister_sysctl();
2408 
2409         unregister_netdevice_notifier(&dn_dev_notifier);
2410 
2411         dn_route_cleanup();
2412         dn_dev_cleanup();
2413         dn_neigh_cleanup();
2414         dn_fib_cleanup();
2415 
2416         remove_proc_entry("decnet", init_net.proc_net);
2417 
2418         proto_unregister(&dn_proto);
2419 
2420         rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2421 }
2422 module_exit(decnet_exit);
2423 #endif
2424 

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