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

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