78ec5344be86e6f65f2c02121a84145bf4bc1cfc
[linux-2.6.git] / net / decnet / af_decnet.c
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/config.h>
103 #include <linux/module.h>
104 #include <linux/errno.h>
105 #include <linux/types.h>
106 #include <linux/slab.h>
107 #include <linux/socket.h>
108 #include <linux/in.h>
109 #include <linux/kernel.h>
110 #include <linux/sched.h>
111 #include <linux/timer.h>
112 #include <linux/string.h>
113 #include <linux/sockios.h>
114 #include <linux/net.h>
115 #include <linux/netdevice.h>
116 #include <linux/inet.h>
117 #include <linux/route.h>
118 #include <linux/netfilter.h>
119 #include <linux/seq_file.h>
120 #include <net/sock.h>
121 #include <net/tcp_states.h>
122 #include <net/flow.h>
123 #include <asm/system.h>
124 #include <asm/ioctls.h>
125 #include <linux/mm.h>
126 #include <linux/interrupt.h>
127 #include <linux/proc_fs.h>
128 #include <linux/stat.h>
129 #include <linux/init.h>
130 #include <linux/poll.h>
131 #include <net/neighbour.h>
132 #include <net/dst.h>
133 #include <net/dn.h>
134 #include <net/dn_nsp.h>
135 #include <net/dn_dev.h>
136 #include <net/dn_route.h>
137 #include <net/dn_fib.h>
138 #include <net/dn_neigh.h>
139
140 struct dn_sock {
141         struct sock sk;
142         struct dn_scp scp;
143 };
144
145 static void dn_keepalive(struct sock *sk);
146
147 #define DN_SK_HASH_SHIFT 8
148 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
149 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
150
151
152 static const struct proto_ops dn_proto_ops;
153 static DEFINE_RWLOCK(dn_hash_lock);
154 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
155 static struct hlist_head dn_wild_sk;
156 static atomic_t decnet_memory_allocated;
157
158 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
159 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
160
161 static struct hlist_head *dn_find_list(struct sock *sk)
162 {
163         struct dn_scp *scp = DN_SK(sk);
164
165         if (scp->addr.sdn_flags & SDF_WILD)
166                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
167
168         return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK];
169 }
170
171 /* 
172  * Valid ports are those greater than zero and not already in use.
173  */
174 static int check_port(unsigned short port)
175 {
176         struct sock *sk;
177         struct hlist_node *node;
178
179         if (port == 0)
180                 return -1;
181
182         sk_for_each(sk, node, &dn_sk_hash[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(++port) != 0) {
197                 if (port == i_port)
198                         return 0;
199         }
200
201         scp->addrloc = 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 hash = addr->sdn_objnum;
253
254         if (hash == 0) {
255                 hash = addr->sdn_objnamel;
256                 for(i = 0; i < dn_ntohs(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++ = dn_ntohs(sdn->sdn_objnamel);
299                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
300                         len = 3 + dn_ntohs(sdn->sdn_objnamel);
301                         break;
302                 case 2:
303                         memset(buf, 0, 5);
304                         buf += 5;
305                         *buf++ = dn_ntohs(sdn->sdn_objnamel);
306                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
307                         len = 7 + dn_ntohs(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 = dn_htons(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 = dn_htons(*data++);
363         len -= dn_ntohs(sdn->sdn_objnamel);
364
365         if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
366                 return -1;
367
368         memcpy(sdn->sdn_objname, data, dn_ntohs(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 hlist_node *node;
377         struct sock *sk;
378
379         read_lock(&dn_hash_lock);
380         sk_for_each(sk, node, list) {
381                 struct dn_scp *scp = DN_SK(sk);
382                 if (sk->sk_state != TCP_LISTEN)
383                         continue;
384                 if (scp->addr.sdn_objnum) {
385                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
386                                 continue;
387                 } else {
388                         if (addr->sdn_objnum)
389                                 continue;
390                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
391                                 continue;
392                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
393                                 continue;
394                 }
395                 sock_hold(sk);
396                 read_unlock(&dn_hash_lock);
397                 return sk;
398         }
399
400         sk = sk_head(&dn_wild_sk);
401         if (sk) {
402                 if (sk->sk_state == TCP_LISTEN)
403                         sock_hold(sk);
404                 else
405                         sk = NULL;
406         }
407
408         read_unlock(&dn_hash_lock);
409         return sk;
410 }
411
412 struct sock *dn_find_by_skb(struct sk_buff *skb)
413 {
414         struct dn_skb_cb *cb = DN_SKB_CB(skb);
415         struct sock *sk;
416         struct hlist_node *node;
417         struct dn_scp *scp;
418
419         read_lock(&dn_hash_lock);
420         sk_for_each(sk, node, &dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK]) {
421                 scp = DN_SK(sk);
422                 if (cb->src != dn_saddr2dn(&scp->peer))
423                         continue;
424                 if (cb->dst_port != scp->addrloc)
425                         continue;
426                 if (scp->addrrem && (cb->src_port != scp->addrrem))
427                         continue;
428                 sock_hold(sk);
429                 goto found;
430         }
431         sk = NULL;
432 found:
433         read_unlock(&dn_hash_lock);
434         return sk;
435 }
436
437
438
439 static void dn_destruct(struct sock *sk)
440 {
441         struct dn_scp *scp = DN_SK(sk);
442
443         skb_queue_purge(&scp->data_xmit_queue);
444         skb_queue_purge(&scp->other_xmit_queue);
445         skb_queue_purge(&scp->other_receive_queue);
446
447         dst_release(xchg(&sk->sk_dst_cache, NULL));
448 }
449
450 static int dn_memory_pressure;
451
452 static void dn_enter_memory_pressure(void)
453 {
454         if (!dn_memory_pressure) {
455                 dn_memory_pressure = 1;
456         }
457 }
458
459 static struct proto dn_proto = {
460         .name                   = "NSP",
461         .owner                  = THIS_MODULE,
462         .enter_memory_pressure  = dn_enter_memory_pressure,
463         .memory_pressure        = &dn_memory_pressure,
464         .memory_allocated       = &decnet_memory_allocated,
465         .sysctl_mem             = sysctl_decnet_mem,
466         .sysctl_wmem            = sysctl_decnet_wmem,
467         .sysctl_rmem            = sysctl_decnet_rmem,
468         .max_header             = DN_MAX_NSP_DATA_HEADER + 64,
469         .obj_size               = sizeof(struct dn_sock),
470 };
471
472 static struct sock *dn_alloc_sock(struct socket *sock, gfp_t gfp)
473 {
474         struct dn_scp *scp;
475         struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
476
477         if  (!sk)
478                 goto out;
479
480         if (sock)
481                 sock->ops = &dn_proto_ops;
482         sock_init_data(sock, sk);
483
484         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
485         sk->sk_destruct    = dn_destruct;
486         sk->sk_no_check    = 1;
487         sk->sk_family      = PF_DECnet;
488         sk->sk_protocol    = 0;
489         sk->sk_allocation  = gfp;
490         sk->sk_sndbuf      = sysctl_decnet_wmem[1];
491         sk->sk_rcvbuf      = sysctl_decnet_rmem[1];
492
493         /* Initialization of DECnet Session Control Port                */
494         scp = DN_SK(sk);
495         scp->state      = DN_O;         /* Open                 */
496         scp->numdat     = 1;            /* Next data seg to tx  */
497         scp->numoth     = 1;            /* Next oth data to tx  */
498         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
499         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
500         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
501         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
502         scp->flowrem_sw = DN_SEND;
503         scp->flowloc_sw = DN_SEND;
504         scp->flowrem_dat = 0;
505         scp->flowrem_oth = 1;
506         scp->flowloc_dat = 0;
507         scp->flowloc_oth = 1;
508         scp->services_rem = 0;
509         scp->services_loc = 1 | NSP_FC_NONE;
510         scp->info_rem = 0;
511         scp->info_loc = 0x03; /* NSP version 4.1 */
512         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
513         scp->nonagle = 0;
514         scp->multi_ireq = 1;
515         scp->accept_mode = ACC_IMMED;
516         scp->addr.sdn_family    = AF_DECnet;
517         scp->peer.sdn_family    = AF_DECnet;
518         scp->accessdata.acc_accl = 5;
519         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
520
521         scp->max_window   = NSP_MAX_WINDOW;
522         scp->snd_window   = NSP_MIN_WINDOW;
523         scp->nsp_srtt     = NSP_INITIAL_SRTT;
524         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
525         scp->nsp_rxtshift = 0;
526
527         skb_queue_head_init(&scp->data_xmit_queue);
528         skb_queue_head_init(&scp->other_xmit_queue);
529         skb_queue_head_init(&scp->other_receive_queue);
530
531         scp->persist = 0;
532         scp->persist_fxn = NULL;
533         scp->keepalive = 10 * HZ;
534         scp->keepalive_fxn = dn_keepalive;
535
536         init_timer(&scp->delack_timer);
537         scp->delack_pending = 0;
538         scp->delack_fxn = dn_nsp_delayed_ack;
539
540         dn_start_slow_timer(sk);
541 out:
542         return sk;
543 }
544
545 /*
546  * Keepalive timer.
547  * FIXME: Should respond to SO_KEEPALIVE etc.
548  */
549 static void dn_keepalive(struct sock *sk)
550 {
551         struct dn_scp *scp = DN_SK(sk);
552
553         /*
554          * By checking the other_data transmit queue is empty
555          * we are double checking that we are not sending too
556          * many of these keepalive frames.
557          */
558         if (skb_queue_empty(&scp->other_xmit_queue))
559                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
560 }
561
562
563 /*
564  * Timer for shutdown/destroyed sockets.
565  * When socket is dead & no packets have been sent for a
566  * certain amount of time, they are removed by this
567  * routine. Also takes care of sending out DI & DC
568  * frames at correct times.
569  */
570 int dn_destroy_timer(struct sock *sk)
571 {
572         struct dn_scp *scp = DN_SK(sk);
573
574         scp->persist = dn_nsp_persist(sk);
575
576         switch(scp->state) {
577                 case DN_DI:
578                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
579                         if (scp->nsp_rxtshift >= decnet_di_count)
580                                 scp->state = DN_CN;
581                         return 0;
582
583                 case DN_DR:
584                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
585                         if (scp->nsp_rxtshift >= decnet_dr_count)
586                                 scp->state = DN_DRC;
587                         return 0;
588
589                 case DN_DN:
590                         if (scp->nsp_rxtshift < decnet_dn_count) {
591                                 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
592                                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
593                                 return 0;
594                         }
595         }
596
597         scp->persist = (HZ * decnet_time_wait);
598
599         if (sk->sk_socket)
600                 return 0;
601
602         if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
603                 dn_unhash_sock(sk);
604                 sock_put(sk);
605                 return 1;
606         }
607
608         return 0;
609 }
610
611 static void dn_destroy_sock(struct sock *sk)
612 {
613         struct dn_scp *scp = DN_SK(sk);
614
615         scp->nsp_rxtshift = 0; /* reset back off */
616
617         if (sk->sk_socket) {
618                 if (sk->sk_socket->state != SS_UNCONNECTED)
619                         sk->sk_socket->state = SS_DISCONNECTING;
620         }
621
622         sk->sk_state = TCP_CLOSE;
623
624         switch(scp->state) {
625                 case DN_DN:
626                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
627                                          sk->sk_allocation);
628                         scp->persist_fxn = dn_destroy_timer;
629                         scp->persist = dn_nsp_persist(sk);
630                         break;
631                 case DN_CR:
632                         scp->state = DN_DR;
633                         goto disc_reject;
634                 case DN_RUN:
635                         scp->state = DN_DI;
636                 case DN_DI:
637                 case DN_DR:
638 disc_reject:
639                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
640                 case DN_NC:
641                 case DN_NR:
642                 case DN_RJ:
643                 case DN_DIC:
644                 case DN_CN:
645                 case DN_DRC:
646                 case DN_CI:
647                 case DN_CD:
648                         scp->persist_fxn = dn_destroy_timer;
649                         scp->persist = dn_nsp_persist(sk);
650                         break;
651                 default:
652                         printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
653                 case DN_O:
654                         dn_stop_slow_timer(sk);
655
656                         dn_unhash_sock_bh(sk);
657                         sock_put(sk);
658
659                         break;
660         }
661 }
662
663 char *dn_addr2asc(dn_address addr, char *buf)
664 {
665         unsigned short node, area;
666
667         node = addr & 0x03ff;
668         area = addr >> 10;
669         sprintf(buf, "%hd.%hd", area, node);
670
671         return buf;
672 }
673
674
675
676 static int dn_create(struct socket *sock, int protocol)
677 {
678         struct sock *sk;
679
680         switch(sock->type) {
681                 case SOCK_SEQPACKET:
682                         if (protocol != DNPROTO_NSP)
683                                 return -EPROTONOSUPPORT;
684                         break;
685                 case SOCK_STREAM:
686                         break;
687                 default:
688                         return -ESOCKTNOSUPPORT;
689         }
690
691
692         if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL) 
693                 return -ENOBUFS;
694
695         sk->sk_protocol = protocol;
696
697         return 0;
698 }
699
700
701 static int
702 dn_release(struct socket *sock)
703 {
704         struct sock *sk = sock->sk;
705
706         if (sk) {
707                 sock_orphan(sk);
708                 sock_hold(sk);
709                 lock_sock(sk);
710                 dn_destroy_sock(sk);
711                 release_sock(sk);
712                 sock_put(sk);
713         }
714
715         return 0;
716 }
717
718 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
719 {
720         struct sock *sk = sock->sk;
721         struct dn_scp *scp = DN_SK(sk);
722         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
723         struct net_device *dev;
724         int rv;
725
726         if (addr_len != sizeof(struct sockaddr_dn))
727                 return -EINVAL;
728
729         if (saddr->sdn_family != AF_DECnet)
730                 return -EINVAL;
731
732         if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
733                 return -EINVAL;
734
735         if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
736                 return -EINVAL;
737
738         if (saddr->sdn_flags & ~SDF_WILD)
739                 return -EINVAL;
740
741         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
742             (saddr->sdn_flags & SDF_WILD)))
743                 return -EACCES;
744
745         if (!(saddr->sdn_flags & SDF_WILD)) {
746                 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
747                         read_lock(&dev_base_lock);
748                         for(dev = dev_base; dev; dev = dev->next) {
749                                 if (!dev->dn_ptr)
750                                         continue;
751                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
752                                         break;
753                         }
754                         read_unlock(&dev_base_lock);
755                         if (dev == NULL)
756                                 return -EADDRNOTAVAIL;
757                 }
758         }
759
760         rv = -EINVAL;
761         lock_sock(sk);
762         if (sock_flag(sk, SOCK_ZAPPED)) {
763                 memcpy(&scp->addr, saddr, addr_len);
764                 sock_reset_flag(sk, SOCK_ZAPPED);
765
766                 rv = dn_hash_sock(sk);
767                 if (rv)
768                         sock_set_flag(sk, SOCK_ZAPPED);
769         }
770         release_sock(sk);
771
772         return rv;
773 }
774
775
776 static int dn_auto_bind(struct socket *sock)
777 {
778         struct sock *sk = sock->sk;
779         struct dn_scp *scp = DN_SK(sk);
780         int rv;
781
782         sock_reset_flag(sk, SOCK_ZAPPED);
783
784         scp->addr.sdn_flags  = 0;
785         scp->addr.sdn_objnum = 0;
786
787         /*
788          * This stuff is to keep compatibility with Eduardo's
789          * patch. I hope I can dispense with it shortly...
790          */
791         if ((scp->accessdata.acc_accl != 0) &&
792                 (scp->accessdata.acc_accl <= 12)) {
793         
794                 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
795                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
796
797                 scp->accessdata.acc_accl = 0;
798                 memset(scp->accessdata.acc_acc, 0, 40);
799         }
800         /* End of compatibility stuff */
801
802         scp->addr.sdn_add.a_len = dn_htons(2);
803         rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr);
804         if (rv == 0) {
805                 rv = dn_hash_sock(sk);
806                 if (rv)
807                         sock_set_flag(sk, SOCK_ZAPPED);
808         }
809
810         return rv;
811 }
812
813 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
814 {
815         struct dn_scp *scp = DN_SK(sk);
816         DEFINE_WAIT(wait);
817         int err;
818
819         if (scp->state != DN_CR)
820                 return -EINVAL;
821
822         scp->state = DN_CC;
823         scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
824         dn_send_conn_conf(sk, allocation);
825
826         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
827         for(;;) {
828                 release_sock(sk);
829                 if (scp->state == DN_CC)
830                         *timeo = schedule_timeout(*timeo);
831                 lock_sock(sk);
832                 err = 0;
833                 if (scp->state == DN_RUN)
834                         break;
835                 err = sock_error(sk);
836                 if (err)
837                         break;
838                 err = sock_intr_errno(*timeo);
839                 if (signal_pending(current))
840                         break;
841                 err = -EAGAIN;
842                 if (!*timeo)
843                         break;
844                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
845         }
846         finish_wait(sk->sk_sleep, &wait);
847         if (err == 0) {
848                 sk->sk_socket->state = SS_CONNECTED;
849         } else if (scp->state != DN_CC) {
850                 sk->sk_socket->state = SS_UNCONNECTED;
851         }
852         return err;
853 }
854
855 static int dn_wait_run(struct sock *sk, long *timeo)
856 {
857         struct dn_scp *scp = DN_SK(sk);
858         DEFINE_WAIT(wait);
859         int err = 0;
860
861         if (scp->state == DN_RUN)
862                 goto out;
863
864         if (!*timeo)
865                 return -EALREADY;
866
867         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
868         for(;;) {
869                 release_sock(sk);
870                 if (scp->state == DN_CI || scp->state == DN_CC)
871                         *timeo = schedule_timeout(*timeo);
872                 lock_sock(sk);
873                 err = 0;
874                 if (scp->state == DN_RUN)
875                         break;
876                 err = sock_error(sk);
877                 if (err)
878                         break;
879                 err = sock_intr_errno(*timeo);
880                 if (signal_pending(current))
881                         break;
882                 err = -ETIMEDOUT;
883                 if (!*timeo)
884                         break;
885                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
886         }
887         finish_wait(sk->sk_sleep, &wait);
888 out:
889         if (err == 0) {
890                 sk->sk_socket->state = SS_CONNECTED;
891         } else if (scp->state != DN_CI && scp->state != DN_CC) {
892                 sk->sk_socket->state = SS_UNCONNECTED;
893         }
894         return err;
895 }
896
897 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
898 {
899         struct socket *sock = sk->sk_socket;
900         struct dn_scp *scp = DN_SK(sk);
901         int err = -EISCONN;
902         struct flowi fl;
903
904         if (sock->state == SS_CONNECTED)
905                 goto out;
906
907         if (sock->state == SS_CONNECTING) {
908                 err = 0;
909                 if (scp->state == DN_RUN) {
910                         sock->state = SS_CONNECTED;
911                         goto out;
912                 }
913                 err = -ECONNREFUSED;
914                 if (scp->state != DN_CI && scp->state != DN_CC) {
915                         sock->state = SS_UNCONNECTED;
916                         goto out;
917                 }
918                 return dn_wait_run(sk, timeo);
919         }
920
921         err = -EINVAL;
922         if (scp->state != DN_O)
923                 goto out;
924
925         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
926                 goto out;
927         if (addr->sdn_family != AF_DECnet)
928                 goto out;
929         if (addr->sdn_flags & SDF_WILD)
930                 goto out;
931
932         if (sock_flag(sk, SOCK_ZAPPED)) {
933                 err = dn_auto_bind(sk->sk_socket);
934                 if (err)
935                         goto out;
936         }
937
938         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
939
940         err = -EHOSTUNREACH;
941         memset(&fl, 0, sizeof(fl));
942         fl.oif = sk->sk_bound_dev_if;
943         fl.fld_dst = dn_saddr2dn(&scp->peer);
944         fl.fld_src = dn_saddr2dn(&scp->addr);
945         dn_sk_ports_copy(&fl, scp);
946         fl.proto = DNPROTO_NSP;
947         if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
948                 goto out;
949         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
950         sock->state = SS_CONNECTING;
951         scp->state = DN_CI;
952         scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
953
954         dn_nsp_send_conninit(sk, NSP_CI);
955         err = -EINPROGRESS;
956         if (*timeo) {
957                 err = dn_wait_run(sk, timeo);
958         }
959 out:
960         return err;
961 }
962
963 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
964 {
965         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
966         struct sock *sk = sock->sk;
967         int err;
968         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
969
970         lock_sock(sk);
971         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
972         release_sock(sk);
973
974         return err;
975 }
976
977 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
978 {
979         struct dn_scp *scp = DN_SK(sk);
980
981         switch(scp->state) {
982                 case DN_RUN:
983                         return 0;
984                 case DN_CR:
985                         return dn_confirm_accept(sk, timeo, sk->sk_allocation);
986                 case DN_CI:
987                 case DN_CC:
988                         return dn_wait_run(sk, timeo);
989                 case DN_O:
990                         return __dn_connect(sk, addr, addrlen, timeo, flags);
991         }
992
993         return -EINVAL;
994 }
995
996
997 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
998 {
999         unsigned char *ptr = skb->data;
1000
1001         acc->acc_userl = *ptr++;
1002         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1003         ptr += acc->acc_userl;
1004
1005         acc->acc_passl = *ptr++;
1006         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1007         ptr += acc->acc_passl;
1008
1009         acc->acc_accl = *ptr++;
1010         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1011
1012         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1013
1014 }
1015
1016 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1017 {
1018         unsigned char *ptr = skb->data;
1019         
1020         opt->opt_optl   = *ptr++;
1021         opt->opt_status = 0;
1022         memcpy(opt->opt_data, ptr, opt->opt_optl);
1023         skb_pull(skb, opt->opt_optl + 1);
1024
1025 }
1026
1027 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1028 {
1029         DEFINE_WAIT(wait);
1030         struct sk_buff *skb = NULL;
1031         int err = 0;
1032
1033         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1034         for(;;) {
1035                 release_sock(sk);
1036                 skb = skb_dequeue(&sk->sk_receive_queue);
1037                 if (skb == NULL) {
1038                         *timeo = schedule_timeout(*timeo);
1039                         skb = skb_dequeue(&sk->sk_receive_queue);
1040                 }
1041                 lock_sock(sk);
1042                 if (skb != NULL)
1043                         break;
1044                 err = -EINVAL;
1045                 if (sk->sk_state != TCP_LISTEN)
1046                         break;
1047                 err = sock_intr_errno(*timeo);
1048                 if (signal_pending(current))
1049                         break;
1050                 err = -EAGAIN;
1051                 if (!*timeo)
1052                         break;
1053                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1054         }
1055         finish_wait(sk->sk_sleep, &wait);
1056
1057         return skb == NULL ? ERR_PTR(err) : skb;
1058 }
1059
1060 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1061 {
1062         struct sock *sk = sock->sk, *newsk;
1063         struct sk_buff *skb = NULL;
1064         struct dn_skb_cb *cb;
1065         unsigned char menuver;
1066         int err = 0;
1067         unsigned char type;
1068         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1069
1070         lock_sock(sk);
1071
1072         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1073                 release_sock(sk);
1074                 return -EINVAL;
1075         }
1076
1077         skb = skb_dequeue(&sk->sk_receive_queue);
1078         if (skb == NULL) {
1079                 skb = dn_wait_for_connect(sk, &timeo);
1080                 if (IS_ERR(skb)) {
1081                         release_sock(sk);
1082                         return PTR_ERR(skb);
1083                 }
1084         }
1085
1086         cb = DN_SKB_CB(skb);
1087         sk->sk_ack_backlog--;
1088         newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1089         if (newsk == NULL) {
1090                 release_sock(sk);
1091                 kfree_skb(skb);
1092                 return -ENOBUFS;
1093         }
1094         release_sock(sk);
1095
1096         dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1097         skb->dst = NULL;
1098
1099         DN_SK(newsk)->state        = DN_CR;
1100         DN_SK(newsk)->addrrem      = cb->src_port;
1101         DN_SK(newsk)->services_rem = cb->services;
1102         DN_SK(newsk)->info_rem     = cb->info;
1103         DN_SK(newsk)->segsize_rem  = cb->segsize;
1104         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1105         
1106         if (DN_SK(newsk)->segsize_rem < 230)
1107                 DN_SK(newsk)->segsize_rem = 230;
1108
1109         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1110                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1111
1112         newsk->sk_state  = TCP_LISTEN;
1113         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1114
1115         /*
1116          * If we are listening on a wild socket, we don't want
1117          * the newly created socket on the wrong hash queue.
1118          */
1119         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1120
1121         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1122         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1123         *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1124         *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1125
1126         menuver = *skb->data;
1127         skb_pull(skb, 1);
1128
1129         if (menuver & DN_MENUVER_ACC)
1130                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1131
1132         if (menuver & DN_MENUVER_USR)
1133                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1134
1135         if (menuver & DN_MENUVER_PRX)
1136                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1137
1138         if (menuver & DN_MENUVER_UIC)
1139                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1140
1141         kfree_skb(skb);
1142
1143         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1144                 sizeof(struct optdata_dn));
1145         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1146                 sizeof(struct optdata_dn));
1147
1148         lock_sock(newsk);
1149         err = dn_hash_sock(newsk);
1150         if (err == 0) {
1151                 sock_reset_flag(newsk, SOCK_ZAPPED);
1152                 dn_send_conn_ack(newsk);
1153
1154                 /*
1155                  * Here we use sk->sk_allocation since although the conn conf is
1156                  * for the newsk, the context is the old socket.
1157                  */
1158                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1159                         err = dn_confirm_accept(newsk, &timeo,
1160                                                 sk->sk_allocation);
1161         }
1162         release_sock(newsk);
1163         return err;
1164 }
1165
1166
1167 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1168 {
1169         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1170         struct sock *sk = sock->sk;
1171         struct dn_scp *scp = DN_SK(sk);
1172
1173         *uaddr_len = sizeof(struct sockaddr_dn);
1174
1175         lock_sock(sk);
1176
1177         if (peer) {
1178                 if ((sock->state != SS_CONNECTED && 
1179                      sock->state != SS_CONNECTING) && 
1180                     scp->accept_mode == ACC_IMMED)
1181                         return -ENOTCONN;
1182
1183                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1184         } else {
1185                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1186         }
1187
1188         release_sock(sk);
1189
1190         return 0;
1191 }
1192
1193
1194 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1195 {
1196         struct sock *sk = sock->sk;
1197         struct dn_scp *scp = DN_SK(sk);
1198         int mask = datagram_poll(file, sock, wait);
1199
1200         if (!skb_queue_empty(&scp->other_receive_queue))
1201                 mask |= POLLRDBAND;
1202
1203         return mask;
1204 }
1205
1206 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1207 {
1208         struct sock *sk = sock->sk;
1209         struct dn_scp *scp = DN_SK(sk);
1210         int err = -EOPNOTSUPP;
1211         long amount = 0;
1212         struct sk_buff *skb;
1213         int val;
1214
1215         switch(cmd)
1216         {
1217         case SIOCGIFADDR:
1218         case SIOCSIFADDR:
1219                 return dn_dev_ioctl(cmd, (void __user *)arg);
1220
1221         case SIOCATMARK:
1222                 lock_sock(sk);
1223                 val = !skb_queue_empty(&scp->other_receive_queue);
1224                 if (scp->state != DN_RUN)
1225                         val = -ENOTCONN;
1226                 release_sock(sk);
1227                 return val;
1228
1229         case TIOCOUTQ:
1230                 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1231                 if (amount < 0)
1232                         amount = 0;
1233                 err = put_user(amount, (int __user *)arg);
1234                 break;
1235
1236         case TIOCINQ:
1237                 lock_sock(sk);
1238                 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1239                         amount = skb->len;
1240                 } else {
1241                         struct sk_buff *skb = sk->sk_receive_queue.next;
1242                         for(;;) {
1243                                 if (skb ==
1244                                     (struct sk_buff *)&sk->sk_receive_queue)
1245                                         break;
1246                                 amount += skb->len;
1247                                 skb = skb->next;
1248                         }
1249                 }
1250                 release_sock(sk);
1251                 err = put_user(amount, (int __user *)arg);
1252                 break;
1253
1254         default:
1255                 err = -ENOIOCTLCMD;
1256                 break;
1257         }
1258
1259         return err;
1260 }
1261
1262 static int dn_listen(struct socket *sock, int backlog)
1263 {
1264         struct sock *sk = sock->sk;
1265         int err = -EINVAL;
1266
1267         lock_sock(sk);
1268
1269         if (sock_flag(sk, SOCK_ZAPPED))
1270                 goto out;
1271
1272         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1273                 goto out;
1274
1275         sk->sk_max_ack_backlog = backlog;
1276         sk->sk_ack_backlog     = 0;
1277         sk->sk_state           = TCP_LISTEN;
1278         err                 = 0;
1279         dn_rehash_sock(sk);
1280
1281 out:
1282         release_sock(sk);
1283
1284         return err;
1285 }
1286
1287
1288 static int dn_shutdown(struct socket *sock, int how)
1289 {
1290         struct sock *sk = sock->sk;
1291         struct dn_scp *scp = DN_SK(sk);
1292         int err = -ENOTCONN;
1293
1294         lock_sock(sk);
1295
1296         if (sock->state == SS_UNCONNECTED)
1297                 goto out;
1298
1299         err = 0;
1300         if (sock->state == SS_DISCONNECTING)
1301                 goto out;
1302
1303         err = -EINVAL;
1304         if (scp->state == DN_O)
1305                 goto out;
1306
1307         if (how != SHUTDOWN_MASK)
1308                 goto out;
1309
1310         sk->sk_shutdown = how;
1311         dn_destroy_sock(sk);
1312         err = 0;
1313
1314 out:
1315         release_sock(sk);
1316
1317         return err;
1318 }
1319
1320 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1321 {
1322         struct sock *sk = sock->sk;
1323         int err;
1324
1325         lock_sock(sk);
1326         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1327         release_sock(sk);
1328
1329         return err;
1330 }
1331
1332 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags) 
1333 {
1334         struct  sock *sk = sock->sk;
1335         struct dn_scp *scp = DN_SK(sk);
1336         long timeo;
1337         union {
1338                 struct optdata_dn opt;
1339                 struct accessdata_dn acc;
1340                 int mode;
1341                 unsigned long win;
1342                 int val;
1343                 unsigned char services;
1344                 unsigned char info;
1345         } u;
1346         int err;
1347
1348         if (optlen && !optval)
1349                 return -EINVAL;
1350
1351         if (optlen > sizeof(u))
1352                 return -EINVAL;
1353
1354         if (copy_from_user(&u, optval, optlen))
1355                 return -EFAULT;
1356
1357         switch(optname) {
1358                 case DSO_CONDATA:
1359                         if (sock->state == SS_CONNECTED) 
1360                                 return -EISCONN;
1361                         if ((scp->state != DN_O) && (scp->state != DN_CR))
1362                                 return -EINVAL;
1363
1364                         if (optlen != sizeof(struct optdata_dn))
1365                                 return -EINVAL;
1366
1367                         if (u.opt.opt_optl > 16)
1368                                 return -EINVAL;
1369
1370                         memcpy(&scp->conndata_out, &u.opt, optlen);
1371                         break;
1372
1373                 case DSO_DISDATA:
1374                         if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1375                                 return -ENOTCONN;
1376
1377                         if (optlen != sizeof(struct optdata_dn))
1378                                 return -EINVAL;
1379
1380                         if (u.opt.opt_optl > 16)
1381                                 return -EINVAL;
1382
1383                         memcpy(&scp->discdata_out, &u.opt, optlen);
1384                         break;
1385
1386                 case DSO_CONACCESS:
1387                         if (sock->state == SS_CONNECTED) 
1388                                 return -EISCONN;
1389                         if (scp->state != DN_O)
1390                                 return -EINVAL;
1391
1392                         if (optlen != sizeof(struct accessdata_dn))
1393                                 return -EINVAL;
1394
1395                         if ((u.acc.acc_accl > DN_MAXACCL) ||
1396                                         (u.acc.acc_passl > DN_MAXACCL) ||
1397                                         (u.acc.acc_userl > DN_MAXACCL))
1398                                 return -EINVAL;
1399
1400                         memcpy(&scp->accessdata, &u.acc, optlen);
1401                         break;
1402
1403                 case DSO_ACCEPTMODE:
1404                         if (sock->state == SS_CONNECTED)
1405                                 return -EISCONN;
1406                         if (scp->state != DN_O)
1407                                 return -EINVAL;
1408
1409                         if (optlen != sizeof(int))
1410                                 return -EINVAL;
1411
1412                         if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1413                                 return -EINVAL;
1414
1415                         scp->accept_mode = (unsigned char)u.mode;
1416                         break;
1417
1418                 case DSO_CONACCEPT:
1419
1420                         if (scp->state != DN_CR)
1421                                 return -EINVAL;
1422                         timeo = sock_rcvtimeo(sk, 0);
1423                         err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1424                         return err;
1425
1426                 case DSO_CONREJECT:
1427
1428                         if (scp->state != DN_CR)
1429                                 return -EINVAL;
1430
1431                         scp->state = DN_DR;
1432                         sk->sk_shutdown = SHUTDOWN_MASK;
1433                         dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1434                         break;
1435
1436                 default:
1437 #ifdef CONFIG_NETFILTER
1438                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1439 #endif
1440                 case DSO_LINKINFO:
1441                 case DSO_STREAM:
1442                 case DSO_SEQPACKET:
1443                         return -ENOPROTOOPT;
1444
1445                 case DSO_MAXWINDOW:
1446                         if (optlen != sizeof(unsigned long))
1447                                 return -EINVAL;
1448                         if (u.win > NSP_MAX_WINDOW)
1449                                 u.win = NSP_MAX_WINDOW;
1450                         if (u.win == 0)
1451                                 return -EINVAL;
1452                         scp->max_window = u.win;
1453                         if (scp->snd_window > u.win)
1454                                 scp->snd_window = u.win;
1455                         break;
1456
1457                 case DSO_NODELAY:
1458                         if (optlen != sizeof(int))
1459                                 return -EINVAL;
1460                         if (scp->nonagle == 2)
1461                                 return -EINVAL;
1462                         scp->nonagle = (u.val == 0) ? 0 : 1;
1463                         /* if (scp->nonagle == 1) { Push pending frames } */
1464                         break;
1465
1466                 case DSO_CORK:
1467                         if (optlen != sizeof(int))
1468                                 return -EINVAL;
1469                         if (scp->nonagle == 1)
1470                                 return -EINVAL;
1471                         scp->nonagle = (u.val == 0) ? 0 : 2;
1472                         /* if (scp->nonagle == 0) { Push pending frames } */
1473                         break;
1474
1475                 case DSO_SERVICES:
1476                         if (optlen != sizeof(unsigned char))
1477                                 return -EINVAL;
1478                         if ((u.services & ~NSP_FC_MASK) != 0x01)
1479                                 return -EINVAL;
1480                         if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1481                                 return -EINVAL;
1482                         scp->services_loc = u.services;
1483                         break;
1484
1485                 case DSO_INFO:
1486                         if (optlen != sizeof(unsigned char))
1487                                 return -EINVAL;
1488                         if (u.info & 0xfc)
1489                                 return -EINVAL;
1490                         scp->info_loc = u.info;
1491                         break;
1492         }
1493
1494         return 0;
1495 }
1496
1497 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1498 {
1499         struct sock *sk = sock->sk;
1500         int err;
1501
1502         lock_sock(sk);
1503         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1504         release_sock(sk);
1505
1506         return err;
1507 }
1508
1509 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1510 {
1511         struct  sock *sk = sock->sk;
1512         struct dn_scp *scp = DN_SK(sk);
1513         struct linkinfo_dn link;
1514         unsigned int r_len;
1515         void *r_data = NULL;
1516         unsigned int val;
1517
1518         if(get_user(r_len , optlen))
1519                 return -EFAULT;
1520                 
1521         switch(optname) {
1522                 case DSO_CONDATA:
1523                         if (r_len > sizeof(struct optdata_dn))
1524                                 r_len = sizeof(struct optdata_dn);
1525                         r_data = &scp->conndata_in;
1526                         break;
1527
1528                 case DSO_DISDATA:
1529                         if (r_len > sizeof(struct optdata_dn))
1530                                 r_len = sizeof(struct optdata_dn);
1531                         r_data = &scp->discdata_in;
1532                         break;
1533
1534                 case DSO_CONACCESS:
1535                         if (r_len > sizeof(struct accessdata_dn))
1536                                 r_len = sizeof(struct accessdata_dn);
1537                         r_data = &scp->accessdata;
1538                         break;
1539
1540                 case DSO_ACCEPTMODE:
1541                         if (r_len > sizeof(unsigned char))
1542                                 r_len = sizeof(unsigned char);
1543                         r_data = &scp->accept_mode;
1544                         break;
1545
1546                 case DSO_LINKINFO:
1547                         if (r_len > sizeof(struct linkinfo_dn))
1548                                 r_len = sizeof(struct linkinfo_dn);
1549
1550                         switch(sock->state) {
1551                                 case SS_CONNECTING:
1552                                         link.idn_linkstate = LL_CONNECTING;
1553                                         break;
1554                                 case SS_DISCONNECTING:
1555                                         link.idn_linkstate = LL_DISCONNECTING;
1556                                         break;
1557                                 case SS_CONNECTED:
1558                                         link.idn_linkstate = LL_RUNNING;
1559                                         break;
1560                                 default:
1561                                         link.idn_linkstate = LL_INACTIVE;
1562                         }
1563
1564                         link.idn_segsize = scp->segsize_rem;
1565                         r_data = &link;
1566                         break;
1567
1568                 default:
1569 #ifdef CONFIG_NETFILTER
1570                 {
1571                         int val, len;
1572                         
1573                         if(get_user(len, optlen))
1574                                 return -EFAULT;
1575                         
1576                         val = nf_getsockopt(sk, PF_DECnet, optname, 
1577                                                         optval, &len);
1578                         if (val >= 0)
1579                                 val = put_user(len, optlen);
1580                         return val;
1581                 }
1582 #endif
1583                 case DSO_STREAM:
1584                 case DSO_SEQPACKET:
1585                 case DSO_CONACCEPT:
1586                 case DSO_CONREJECT:
1587                         return -ENOPROTOOPT;
1588
1589                 case DSO_MAXWINDOW:
1590                         if (r_len > sizeof(unsigned long))
1591                                 r_len = sizeof(unsigned long);
1592                         r_data = &scp->max_window;
1593                         break;
1594
1595                 case DSO_NODELAY:
1596                         if (r_len > sizeof(int))
1597                                 r_len = sizeof(int);
1598                         val = (scp->nonagle == 1);
1599                         r_data = &val;
1600                         break;
1601
1602                 case DSO_CORK:
1603                         if (r_len > sizeof(int))
1604                                 r_len = sizeof(int);
1605                         val = (scp->nonagle == 2);
1606                         r_data = &val;
1607                         break;
1608
1609                 case DSO_SERVICES:
1610                         if (r_len > sizeof(unsigned char))
1611                                 r_len = sizeof(unsigned char);
1612                         r_data = &scp->services_rem;
1613                         break;
1614
1615                 case DSO_INFO:
1616                         if (r_len > sizeof(unsigned char))
1617                                 r_len = sizeof(unsigned char);
1618                         r_data = &scp->info_rem;
1619                         break;
1620         }
1621
1622         if (r_data) {
1623                 if (copy_to_user(optval, r_data, r_len))
1624                         return -EFAULT;
1625                 if (put_user(r_len, optlen))
1626                         return -EFAULT;
1627         }
1628
1629         return 0;
1630 }
1631
1632
1633 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1634 {
1635         struct sk_buff *skb = q->next;
1636         int len = 0;
1637
1638         if (flags & MSG_OOB)
1639                 return !skb_queue_empty(q) ? 1 : 0;
1640
1641         while(skb != (struct sk_buff *)q) {
1642                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1643                 len += skb->len;
1644
1645                 if (cb->nsp_flags & 0x40) {
1646                         /* SOCK_SEQPACKET reads to EOM */
1647                         if (sk->sk_type == SOCK_SEQPACKET)
1648                                 return 1;
1649                         /* so does SOCK_STREAM unless WAITALL is specified */
1650                         if (!(flags & MSG_WAITALL))
1651                                 return 1;
1652                 }
1653
1654                 /* minimum data length for read exceeded */
1655                 if (len >= target)
1656                         return 1;
1657
1658                 skb = skb->next;
1659         }
1660
1661         return 0;
1662 }
1663
1664
1665 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1666         struct msghdr *msg, size_t size, int flags)
1667 {
1668         struct sock *sk = sock->sk;
1669         struct dn_scp *scp = DN_SK(sk);
1670         struct sk_buff_head *queue = &sk->sk_receive_queue;
1671         size_t target = size > 1 ? 1 : 0;
1672         size_t copied = 0;
1673         int rv = 0;
1674         struct sk_buff *skb, *nskb;
1675         struct dn_skb_cb *cb = NULL;
1676         unsigned char eor = 0;
1677         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1678
1679         lock_sock(sk);
1680
1681         if (sock_flag(sk, SOCK_ZAPPED)) {
1682                 rv = -EADDRNOTAVAIL;
1683                 goto out;
1684         }
1685
1686         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1687                 rv = 0;
1688                 goto out;
1689         }
1690
1691         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1692         if (rv)
1693                 goto out;
1694
1695         if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1696                 rv = -EOPNOTSUPP;
1697                 goto out;
1698         }
1699
1700         if (flags & MSG_OOB)
1701                 queue = &scp->other_receive_queue;
1702
1703         if (flags & MSG_WAITALL)
1704                 target = size;
1705
1706
1707         /*
1708          * See if there is data ready to read, sleep if there isn't
1709          */
1710         for(;;) {
1711                 if (sk->sk_err)
1712                         goto out;
1713
1714                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1715                         if (!(flags & MSG_OOB)) {
1716                                 msg->msg_flags |= MSG_OOB;
1717                                 if (!scp->other_report) {
1718                                         scp->other_report = 1;
1719                                         goto out;
1720                                 }
1721                         }
1722                 }
1723                 
1724                 if (scp->state != DN_RUN)
1725                         goto out;
1726
1727                 if (signal_pending(current)) {
1728                         rv = sock_intr_errno(timeo);
1729                         goto out;
1730                 }
1731
1732                 if (dn_data_ready(sk, queue, flags, target))
1733                         break;
1734
1735                 if (flags & MSG_DONTWAIT) {
1736                         rv = -EWOULDBLOCK;
1737                         goto out;
1738                 }
1739
1740                 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1741                 SOCK_SLEEP_PRE(sk)
1742
1743                 if (!dn_data_ready(sk, queue, flags, target))
1744                         schedule();
1745
1746                 SOCK_SLEEP_POST(sk)
1747                 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1748         }
1749
1750         for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1751                 unsigned int chunk = skb->len;
1752                 cb = DN_SKB_CB(skb);
1753
1754                 if ((chunk + copied) > size)
1755                         chunk = size - copied;
1756
1757                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1758                         rv = -EFAULT;
1759                         break;
1760                 }
1761                 copied += chunk;
1762
1763                 if (!(flags & MSG_PEEK))
1764                         skb_pull(skb, chunk);
1765
1766                 eor = cb->nsp_flags & 0x40;
1767                 nskb = skb->next;
1768
1769                 if (skb->len == 0) {
1770                         skb_unlink(skb, queue);
1771                         kfree_skb(skb);
1772                         /* 
1773                          * N.B. Don't refer to skb or cb after this point
1774                          * in loop.
1775                          */
1776                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1777                                 scp->flowloc_sw = DN_SEND;
1778                                 dn_nsp_send_link(sk, DN_SEND, 0);
1779                         }
1780                 }
1781
1782                 if (eor) { 
1783                         if (sk->sk_type == SOCK_SEQPACKET)
1784                                 break;
1785                         if (!(flags & MSG_WAITALL))
1786                                 break;
1787                 }
1788
1789                 if (flags & MSG_OOB)
1790                         break;
1791
1792                 if (copied >= target)
1793                         break;
1794         }
1795
1796         rv = copied;
1797
1798
1799         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1800                 msg->msg_flags |= MSG_EOR;
1801
1802 out:
1803         if (rv == 0)
1804                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1805
1806         if ((rv >= 0) && msg->msg_name) {
1807                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1808                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1809         }
1810
1811         release_sock(sk);
1812
1813         return rv;
1814 }
1815
1816
1817 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1818 {
1819         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1820         if (skb_queue_len(queue) >= scp->snd_window)
1821                 return 1;
1822         if (fctype != NSP_FC_NONE) {
1823                 if (flags & MSG_OOB) {
1824                         if (scp->flowrem_oth == 0)
1825                                 return 1;
1826                 } else {
1827                         if (scp->flowrem_dat == 0)
1828                                 return 1;
1829                 }
1830         }
1831         return 0;
1832 }
1833
1834 /*
1835  * The DECnet spec requires the the "routing layer" accepts packets which
1836  * are at least 230 bytes in size. This excludes any headers which the NSP
1837  * layer might add, so we always assume that we'll be using the maximal
1838  * length header on data packets. The variation in length is due to the
1839  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1840  * make much practical difference.
1841  */
1842 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1843 {
1844         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1845         if (dev) {
1846                 struct dn_dev *dn_db = dev->dn_ptr;
1847                 mtu -= LL_RESERVED_SPACE(dev);
1848                 if (dn_db->use_long)
1849                         mtu -= 21;
1850                 else
1851                         mtu -= 6;
1852                 mtu -= DN_MAX_NSP_DATA_HEADER;
1853         } else {
1854                 /*
1855                  * 21 = long header, 16 = guess at MAC header length
1856                  */
1857                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1858         }
1859         if (mtu > mss)
1860                 mss = mtu;
1861         return mss;
1862 }
1863
1864 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1865 {
1866         struct dst_entry *dst = __sk_dst_get(sk);
1867         struct dn_scp *scp = DN_SK(sk);
1868         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1869
1870         /* Other data messages are limited to 16 bytes per packet */
1871         if (flags & MSG_OOB)
1872                 return 16;
1873
1874         /* This works out the maximum size of segment we can send out */
1875         if (dst) {
1876                 u32 mtu = dst_mtu(dst);
1877                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1878         }
1879
1880         return mss_now;
1881 }
1882
1883 /* 
1884  * N.B. We get the timeout wrong here, but then we always did get it
1885  * wrong before and this is another step along the road to correcting
1886  * it. It ought to get updated each time we pass through the routine,
1887  * but in practise it probably doesn't matter too much for now.
1888  */
1889 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1890                               unsigned long datalen, int noblock,
1891                               int *errcode)
1892 {
1893         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1894                                                    noblock, errcode);
1895         if (skb) {
1896                 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1897                 skb->pkt_type = PACKET_OUTGOING;
1898         }
1899         return skb;
1900 }
1901
1902 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1903                       struct msghdr *msg, size_t size)
1904 {
1905         struct sock *sk = sock->sk;
1906         struct dn_scp *scp = DN_SK(sk);
1907         size_t mss;
1908         struct sk_buff_head *queue = &scp->data_xmit_queue;
1909         int flags = msg->msg_flags;
1910         int err = 0;
1911         size_t sent = 0;
1912         int addr_len = msg->msg_namelen;
1913         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1914         struct sk_buff *skb = NULL;
1915         struct dn_skb_cb *cb;
1916         size_t len;
1917         unsigned char fctype;
1918         long timeo;
1919
1920         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1921                 return -EOPNOTSUPP;
1922
1923         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1924                 return -EINVAL;
1925
1926         lock_sock(sk);
1927         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1928         /*
1929          * The only difference between stream sockets and sequenced packet
1930          * sockets is that the stream sockets always behave as if MSG_EOR
1931          * has been set.
1932          */
1933         if (sock->type == SOCK_STREAM) {
1934                 if (flags & MSG_EOR) {
1935                         err = -EINVAL;
1936                         goto out;
1937                 }
1938                 flags |= MSG_EOR;
1939         }
1940
1941
1942         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1943         if (err)
1944                 goto out_err;
1945
1946         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1947                 err = -EPIPE;
1948                 if (!(flags & MSG_NOSIGNAL))
1949                         send_sig(SIGPIPE, current, 0);
1950                 goto out_err;
1951         }
1952
1953         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1954                 dst_negative_advice(&sk->sk_dst_cache);
1955
1956         mss = scp->segsize_rem;
1957         fctype = scp->services_rem & NSP_FC_MASK;
1958
1959         mss = dn_current_mss(sk, flags);
1960
1961         if (flags & MSG_OOB) {
1962                 queue = &scp->other_xmit_queue;
1963                 if (size > mss) {
1964                         err = -EMSGSIZE;
1965                         goto out;
1966                 }
1967         }
1968
1969         scp->persist_fxn = dn_nsp_xmit_timeout;
1970
1971         while(sent < size) {
1972                 err = sock_error(sk);
1973                 if (err)
1974                         goto out;
1975
1976                 if (signal_pending(current)) {
1977                         err = sock_intr_errno(timeo);
1978                         goto out;
1979                 }
1980
1981                 /*
1982                  * Calculate size that we wish to send.
1983                  */
1984                 len = size - sent;
1985
1986                 if (len > mss)
1987                         len = mss;
1988
1989                 /*
1990                  * Wait for queue size to go down below the window
1991                  * size.
1992                  */
1993                 if (dn_queue_too_long(scp, queue, flags)) {
1994                         if (flags & MSG_DONTWAIT) {
1995                                 err = -EWOULDBLOCK;
1996                                 goto out;
1997                         }
1998
1999                         SOCK_SLEEP_PRE(sk)
2000
2001                         if (dn_queue_too_long(scp, queue, flags))
2002                                 schedule();
2003
2004                         SOCK_SLEEP_POST(sk)
2005
2006                         continue;
2007                 }
2008
2009                 /*
2010                  * Get a suitably sized skb.
2011                  * 64 is a bit of a hack really, but its larger than any
2012                  * link-layer headers and has served us well as a good
2013                  * guess as to their real length.
2014                  */
2015                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2016                                          flags & MSG_DONTWAIT, &err);
2017
2018                 if (err)
2019                         break;
2020
2021                 if (!skb)
2022                         continue;
2023
2024                 cb = DN_SKB_CB(skb);
2025
2026                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2027
2028                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2029                         err = -EFAULT;
2030                         goto out;
2031                 }
2032
2033                 if (flags & MSG_OOB) {
2034                         cb->nsp_flags = 0x30;
2035                         if (fctype != NSP_FC_NONE)
2036                                 scp->flowrem_oth--;
2037                 } else {
2038                         cb->nsp_flags = 0x00;
2039                         if (scp->seg_total == 0)
2040                                 cb->nsp_flags |= 0x20;
2041
2042                         scp->seg_total += len;
2043                 
2044                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2045                                 cb->nsp_flags |= 0x40;
2046                                 scp->seg_total = 0;
2047                                 if (fctype == NSP_FC_SCMC)
2048                                         scp->flowrem_dat--;
2049                         }
2050                         if (fctype == NSP_FC_SRC)
2051                                 scp->flowrem_dat--;
2052                 }
2053
2054                 sent += len;
2055                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2056                 skb = NULL;
2057
2058                 scp->persist = dn_nsp_persist(sk);
2059
2060         }
2061 out:
2062
2063         if (skb)
2064                 kfree_skb(skb);
2065
2066         release_sock(sk);
2067
2068         return sent ? sent : err;
2069
2070 out_err:
2071         err = sk_stream_error(sk, flags, err);
2072         release_sock(sk);
2073         return err;
2074 }
2075
2076 static int dn_device_event(struct notifier_block *this, unsigned long event,
2077                         void *ptr)
2078 {
2079         struct net_device *dev = (struct net_device *)ptr;
2080
2081         switch(event) {
2082                 case NETDEV_UP:
2083                         dn_dev_up(dev);
2084                         break;
2085                 case NETDEV_DOWN:
2086                         dn_dev_down(dev);
2087                         break;
2088                 default:
2089                         break;
2090         }
2091
2092         return NOTIFY_DONE;
2093 }
2094
2095 static struct notifier_block dn_dev_notifier = {
2096         .notifier_call = dn_device_event,
2097 };
2098
2099 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2100
2101 static struct packet_type dn_dix_packet_type = {
2102         .type =         __constant_htons(ETH_P_DNA_RT),
2103         .dev =          NULL,           /* All devices */
2104         .func =         dn_route_rcv,
2105 };
2106
2107 #ifdef CONFIG_PROC_FS
2108 struct dn_iter_state {
2109         int bucket;
2110 };
2111
2112 static struct sock *dn_socket_get_first(struct seq_file *seq)
2113 {
2114         struct dn_iter_state *state = seq->private;
2115         struct sock *n = NULL;
2116
2117         for(state->bucket = 0;
2118             state->bucket < DN_SK_HASH_SIZE;
2119             ++state->bucket) {
2120                 n = sk_head(&dn_sk_hash[state->bucket]);
2121                 if (n)
2122                         break;
2123         }
2124
2125         return n;
2126 }
2127
2128 static struct sock *dn_socket_get_next(struct seq_file *seq,
2129                                        struct sock *n)
2130 {
2131         struct dn_iter_state *state = seq->private;
2132
2133         n = sk_next(n);
2134 try_again:
2135         if (n)
2136                 goto out;
2137         if (++state->bucket >= DN_SK_HASH_SIZE)
2138                 goto out;
2139         n = sk_head(&dn_sk_hash[state->bucket]);
2140         goto try_again;
2141 out:
2142         return n;
2143 }
2144
2145 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2146 {
2147         struct sock *sk = dn_socket_get_first(seq);
2148
2149         if (sk) {
2150                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2151                         --*pos;
2152         }
2153         return *pos ? NULL : sk;
2154 }
2155
2156 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2157 {
2158         void *rc;
2159         read_lock_bh(&dn_hash_lock);
2160         rc = socket_get_idx(seq, &pos);
2161         if (!rc) {
2162                 read_unlock_bh(&dn_hash_lock);
2163         }
2164         return rc;
2165 }
2166
2167 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2168 {
2169         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2170 }
2171
2172 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2173 {
2174         void *rc;
2175
2176         if (v == SEQ_START_TOKEN) {
2177                 rc = dn_socket_get_idx(seq, 0);
2178                 goto out;
2179         }
2180
2181         rc = dn_socket_get_next(seq, v);
2182         if (rc)
2183                 goto out;
2184         read_unlock_bh(&dn_hash_lock);
2185 out:
2186         ++*pos;
2187         return rc;
2188 }
2189
2190 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2191 {
2192         if (v && v != SEQ_START_TOKEN)
2193                 read_unlock_bh(&dn_hash_lock);
2194 }
2195
2196 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2197
2198 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2199 {
2200         int i;
2201     
2202         switch (dn_ntohs(dn->sdn_objnamel)) {
2203                 case 0:
2204                         sprintf(buf, "%d", dn->sdn_objnum);
2205                         break;
2206                 default:
2207                         for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2208                                 buf[i] = dn->sdn_objname[i];
2209                                 if (IS_NOT_PRINTABLE(buf[i]))
2210                                         buf[i] = '.';
2211                         }
2212                         buf[i] = 0;
2213         }
2214 }
2215
2216 static char *dn_state2asc(unsigned char state)
2217 {
2218         switch(state) {
2219                 case DN_O:
2220                         return "OPEN";
2221                 case DN_CR:
2222                         return "  CR";
2223                 case DN_DR:
2224                         return "  DR";
2225                 case DN_DRC:
2226                         return " DRC";
2227                 case DN_CC:
2228                         return "  CC";
2229                 case DN_CI:
2230                         return "  CI";
2231                 case DN_NR:
2232                         return "  NR";
2233                 case DN_NC:
2234                         return "  NC";
2235                 case DN_CD:
2236                         return "  CD";
2237                 case DN_RJ:
2238                         return "  RJ";
2239                 case DN_RUN:
2240                         return " RUN";
2241                 case DN_DI:
2242                         return "  DI";
2243                 case DN_DIC:
2244                         return " DIC";
2245                 case DN_DN:
2246                         return "  DN";
2247                 case DN_CL:
2248                         return "  CL";
2249                 case DN_CN:
2250                         return "  CN";
2251         }
2252
2253         return "????";
2254 }
2255
2256 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2257 {
2258         struct dn_scp *scp = DN_SK(sk);
2259         char buf1[DN_ASCBUF_LEN];
2260         char buf2[DN_ASCBUF_LEN];
2261         char local_object[DN_MAXOBJL+3];
2262         char remote_object[DN_MAXOBJL+3];
2263
2264         dn_printable_object(&scp->addr, local_object);
2265         dn_printable_object(&scp->peer, remote_object);
2266
2267         seq_printf(seq,
2268                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2269                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2270                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2271                    scp->addrloc,
2272                    scp->numdat,
2273                    scp->numoth,
2274                    scp->ackxmt_dat,
2275                    scp->ackxmt_oth,
2276                    scp->flowloc_sw,
2277                    local_object,
2278                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2279                    scp->addrrem,
2280                    scp->numdat_rcv,
2281                    scp->numoth_rcv,
2282                    scp->ackrcv_dat,
2283                    scp->ackrcv_oth,
2284                    scp->flowrem_sw,
2285                    remote_object,
2286                    dn_state2asc(scp->state),
2287                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2288 }
2289
2290 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2291 {
2292         if (v == SEQ_START_TOKEN) {
2293                 seq_puts(seq, "Local                                              Remote\n");
2294         } else {
2295                 dn_socket_format_entry(seq, v);
2296         }
2297         return 0;
2298 }
2299
2300 static struct seq_operations dn_socket_seq_ops = {
2301         .start  = dn_socket_seq_start,
2302         .next   = dn_socket_seq_next,
2303         .stop   = dn_socket_seq_stop,
2304         .show   = dn_socket_seq_show,
2305 };
2306
2307 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2308 {
2309         struct seq_file *seq;
2310         int rc = -ENOMEM;
2311         struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2312
2313         if (!s)
2314                 goto out;
2315
2316         rc = seq_open(file, &dn_socket_seq_ops);
2317         if (rc)
2318                 goto out_kfree;
2319
2320         seq             = file->private_data;
2321         seq->private    = s;
2322         memset(s, 0, sizeof(*s));
2323 out:
2324         return rc;
2325 out_kfree:
2326         kfree(s);
2327         goto out;
2328 }
2329
2330 static struct file_operations dn_socket_seq_fops = {
2331         .owner          = THIS_MODULE,
2332         .open           = dn_socket_seq_open,
2333         .read           = seq_read,
2334         .llseek         = seq_lseek,
2335         .release        = seq_release_private,
2336 };
2337 #endif
2338
2339 static struct net_proto_family  dn_family_ops = {
2340         .family =       AF_DECnet,
2341         .create =       dn_create,
2342         .owner  =       THIS_MODULE,
2343 };
2344
2345 static const struct proto_ops dn_proto_ops = {
2346         .family =       AF_DECnet,
2347         .owner =        THIS_MODULE,
2348         .release =      dn_release,
2349         .bind =         dn_bind,
2350         .connect =      dn_connect,
2351         .socketpair =   sock_no_socketpair,
2352         .accept =       dn_accept,
2353         .getname =      dn_getname,
2354         .poll =         dn_poll,
2355         .ioctl =        dn_ioctl,
2356         .listen =       dn_listen,
2357         .shutdown =     dn_shutdown,
2358         .setsockopt =   dn_setsockopt,
2359         .getsockopt =   dn_getsockopt,
2360         .sendmsg =      dn_sendmsg,
2361         .recvmsg =      dn_recvmsg,
2362         .mmap =         sock_no_mmap,
2363         .sendpage =     sock_no_sendpage,
2364 };
2365
2366 void dn_register_sysctl(void);
2367 void dn_unregister_sysctl(void);
2368
2369 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2370 MODULE_AUTHOR("Linux DECnet Project Team");
2371 MODULE_LICENSE("GPL");
2372 MODULE_ALIAS_NETPROTO(PF_DECnet);
2373
2374 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2375
2376 static int __init decnet_init(void)
2377 {
2378         int rc;
2379
2380         printk(banner);
2381
2382         rc = proto_register(&dn_proto, 1);
2383         if (rc != 0)
2384                 goto out;
2385
2386         dn_neigh_init();
2387         dn_dev_init();
2388         dn_route_init();
2389         dn_fib_init();
2390
2391         sock_register(&dn_family_ops);
2392         dev_add_pack(&dn_dix_packet_type);
2393         register_netdevice_notifier(&dn_dev_notifier);
2394
2395         proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2396         dn_register_sysctl();
2397 out:
2398         return rc;
2399
2400 }
2401 module_init(decnet_init);
2402
2403 /*
2404  * Prevent DECnet module unloading until its fixed properly.
2405  * Requires an audit of the code to check for memory leaks and
2406  * initialisation problems etc.
2407  */
2408 #if 0
2409 static void __exit decnet_exit(void)
2410 {
2411         sock_unregister(AF_DECnet);
2412         dev_remove_pack(&dn_dix_packet_type);
2413
2414         dn_unregister_sysctl();
2415
2416         unregister_netdevice_notifier(&dn_dev_notifier);
2417
2418         dn_route_cleanup();
2419         dn_dev_cleanup();
2420         dn_neigh_cleanup();
2421         dn_fib_cleanup();
2422
2423         proc_net_remove("decnet");
2424
2425         proto_unregister(&dn_proto);
2426 }
2427 module_exit(decnet_exit);
2428 #endif