~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/decnet/af_decnet.c

Version: ~ [ linux-5.11 ] ~ [ linux-5.10.17 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.99 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.176 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.221 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.257 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.257 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp