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

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

Version: ~ [ linux-5.12-rc6 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ 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/signal.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                      bool kern)
1075 {
1076         struct sock *sk = sock->sk, *newsk;
1077         struct sk_buff *skb = NULL;
1078         struct dn_skb_cb *cb;
1079         unsigned char menuver;
1080         int err = 0;
1081         unsigned char type;
1082         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1083         struct dst_entry *dst;
1084 
1085         lock_sock(sk);
1086 
1087         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1088                 release_sock(sk);
1089                 return -EINVAL;
1090         }
1091 
1092         skb = skb_dequeue(&sk->sk_receive_queue);
1093         if (skb == NULL) {
1094                 skb = dn_wait_for_connect(sk, &timeo);
1095                 if (IS_ERR(skb)) {
1096                         release_sock(sk);
1097                         return PTR_ERR(skb);
1098                 }
1099         }
1100 
1101         cb = DN_SKB_CB(skb);
1102         sk->sk_ack_backlog--;
1103         newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1104         if (newsk == NULL) {
1105                 release_sock(sk);
1106                 kfree_skb(skb);
1107                 return -ENOBUFS;
1108         }
1109         release_sock(sk);
1110 
1111         dst = skb_dst(skb);
1112         sk_dst_set(newsk, dst);
1113         skb_dst_set(skb, NULL);
1114 
1115         DN_SK(newsk)->state        = DN_CR;
1116         DN_SK(newsk)->addrrem      = cb->src_port;
1117         DN_SK(newsk)->services_rem = cb->services;
1118         DN_SK(newsk)->info_rem     = cb->info;
1119         DN_SK(newsk)->segsize_rem  = cb->segsize;
1120         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1121 
1122         if (DN_SK(newsk)->segsize_rem < 230)
1123                 DN_SK(newsk)->segsize_rem = 230;
1124 
1125         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1126                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1127 
1128         newsk->sk_state  = TCP_LISTEN;
1129         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1130 
1131         /*
1132          * If we are listening on a wild socket, we don't want
1133          * the newly created socket on the wrong hash queue.
1134          */
1135         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1136 
1137         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1138         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1139         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1140         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1141 
1142         menuver = *skb->data;
1143         skb_pull(skb, 1);
1144 
1145         if (menuver & DN_MENUVER_ACC)
1146                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1147 
1148         if (menuver & DN_MENUVER_USR)
1149                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1150 
1151         if (menuver & DN_MENUVER_PRX)
1152                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1153 
1154         if (menuver & DN_MENUVER_UIC)
1155                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1156 
1157         kfree_skb(skb);
1158 
1159         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1160                 sizeof(struct optdata_dn));
1161         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1162                 sizeof(struct optdata_dn));
1163 
1164         lock_sock(newsk);
1165         err = dn_hash_sock(newsk);
1166         if (err == 0) {
1167                 sock_reset_flag(newsk, SOCK_ZAPPED);
1168                 dn_send_conn_ack(newsk);
1169 
1170                 /*
1171                  * Here we use sk->sk_allocation since although the conn conf is
1172                  * for the newsk, the context is the old socket.
1173                  */
1174                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1175                         err = dn_confirm_accept(newsk, &timeo,
1176                                                 sk->sk_allocation);
1177         }
1178         release_sock(newsk);
1179         return err;
1180 }
1181 
1182 
1183 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1184 {
1185         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1186         struct sock *sk = sock->sk;
1187         struct dn_scp *scp = DN_SK(sk);
1188 
1189         *uaddr_len = sizeof(struct sockaddr_dn);
1190 
1191         lock_sock(sk);
1192 
1193         if (peer) {
1194                 if ((sock->state != SS_CONNECTED &&
1195                      sock->state != SS_CONNECTING) &&
1196                     scp->accept_mode == ACC_IMMED) {
1197                         release_sock(sk);
1198                         return -ENOTCONN;
1199                 }
1200 
1201                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1202         } else {
1203                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1204         }
1205 
1206         release_sock(sk);
1207 
1208         return 0;
1209 }
1210 
1211 
1212 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1213 {
1214         struct sock *sk = sock->sk;
1215         struct dn_scp *scp = DN_SK(sk);
1216         int mask = datagram_poll(file, sock, wait);
1217 
1218         if (!skb_queue_empty(&scp->other_receive_queue))
1219                 mask |= POLLRDBAND;
1220 
1221         return mask;
1222 }
1223 
1224 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1225 {
1226         struct sock *sk = sock->sk;
1227         struct dn_scp *scp = DN_SK(sk);
1228         int err = -EOPNOTSUPP;
1229         long amount = 0;
1230         struct sk_buff *skb;
1231         int val;
1232 
1233         switch(cmd)
1234         {
1235         case SIOCGIFADDR:
1236         case SIOCSIFADDR:
1237                 return dn_dev_ioctl(cmd, (void __user *)arg);
1238 
1239         case SIOCATMARK:
1240                 lock_sock(sk);
1241                 val = !skb_queue_empty(&scp->other_receive_queue);
1242                 if (scp->state != DN_RUN)
1243                         val = -ENOTCONN;
1244                 release_sock(sk);
1245                 return val;
1246 
1247         case TIOCOUTQ:
1248                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1249                 if (amount < 0)
1250                         amount = 0;
1251                 err = put_user(amount, (int __user *)arg);
1252                 break;
1253 
1254         case TIOCINQ:
1255                 lock_sock(sk);
1256                 skb = skb_peek(&scp->other_receive_queue);
1257                 if (skb) {
1258                         amount = skb->len;
1259                 } else {
1260                         skb_queue_walk(&sk->sk_receive_queue, skb)
1261                                 amount += skb->len;
1262                 }
1263                 release_sock(sk);
1264                 err = put_user(amount, (int __user *)arg);
1265                 break;
1266 
1267         default:
1268                 err = -ENOIOCTLCMD;
1269                 break;
1270         }
1271 
1272         return err;
1273 }
1274 
1275 static int dn_listen(struct socket *sock, int backlog)
1276 {
1277         struct sock *sk = sock->sk;
1278         int err = -EINVAL;
1279 
1280         lock_sock(sk);
1281 
1282         if (sock_flag(sk, SOCK_ZAPPED))
1283                 goto out;
1284 
1285         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1286                 goto out;
1287 
1288         sk->sk_max_ack_backlog = backlog;
1289         sk->sk_ack_backlog     = 0;
1290         sk->sk_state           = TCP_LISTEN;
1291         err                 = 0;
1292         dn_rehash_sock(sk);
1293 
1294 out:
1295         release_sock(sk);
1296 
1297         return err;
1298 }
1299 
1300 
1301 static int dn_shutdown(struct socket *sock, int how)
1302 {
1303         struct sock *sk = sock->sk;
1304         struct dn_scp *scp = DN_SK(sk);
1305         int err = -ENOTCONN;
1306 
1307         lock_sock(sk);
1308 
1309         if (sock->state == SS_UNCONNECTED)
1310                 goto out;
1311 
1312         err = 0;
1313         if (sock->state == SS_DISCONNECTING)
1314                 goto out;
1315 
1316         err = -EINVAL;
1317         if (scp->state == DN_O)
1318                 goto out;
1319 
1320         if (how != SHUT_RDWR)
1321                 goto out;
1322 
1323         sk->sk_shutdown = SHUTDOWN_MASK;
1324         dn_destroy_sock(sk);
1325         err = 0;
1326 
1327 out:
1328         release_sock(sk);
1329 
1330         return err;
1331 }
1332 
1333 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1334 {
1335         struct sock *sk = sock->sk;
1336         int err;
1337 
1338         lock_sock(sk);
1339         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1340         release_sock(sk);
1341 
1342         return err;
1343 }
1344 
1345 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1346 {
1347         struct  sock *sk = sock->sk;
1348         struct dn_scp *scp = DN_SK(sk);
1349         long timeo;
1350         union {
1351                 struct optdata_dn opt;
1352                 struct accessdata_dn acc;
1353                 int mode;
1354                 unsigned long win;
1355                 int val;
1356                 unsigned char services;
1357                 unsigned char info;
1358         } u;
1359         int err;
1360 
1361         if (optlen && !optval)
1362                 return -EINVAL;
1363 
1364         if (optlen > sizeof(u))
1365                 return -EINVAL;
1366 
1367         if (copy_from_user(&u, optval, optlen))
1368                 return -EFAULT;
1369 
1370         switch (optname) {
1371         case DSO_CONDATA:
1372                 if (sock->state == SS_CONNECTED)
1373                         return -EISCONN;
1374                 if ((scp->state != DN_O) && (scp->state != DN_CR))
1375                         return -EINVAL;
1376 
1377                 if (optlen != sizeof(struct optdata_dn))
1378                         return -EINVAL;
1379 
1380                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1381                         return -EINVAL;
1382 
1383                 memcpy(&scp->conndata_out, &u.opt, optlen);
1384                 break;
1385 
1386         case DSO_DISDATA:
1387                 if (sock->state != SS_CONNECTED &&
1388                     scp->accept_mode == ACC_IMMED)
1389                         return -ENOTCONN;
1390 
1391                 if (optlen != sizeof(struct optdata_dn))
1392                         return -EINVAL;
1393 
1394                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1395                         return -EINVAL;
1396 
1397                 memcpy(&scp->discdata_out, &u.opt, optlen);
1398                 break;
1399 
1400         case DSO_CONACCESS:
1401                 if (sock->state == SS_CONNECTED)
1402                         return -EISCONN;
1403                 if (scp->state != DN_O)
1404                         return -EINVAL;
1405 
1406                 if (optlen != sizeof(struct accessdata_dn))
1407                         return -EINVAL;
1408 
1409                 if ((u.acc.acc_accl > DN_MAXACCL) ||
1410                     (u.acc.acc_passl > DN_MAXACCL) ||
1411                     (u.acc.acc_userl > DN_MAXACCL))
1412                         return -EINVAL;
1413 
1414                 memcpy(&scp->accessdata, &u.acc, optlen);
1415                 break;
1416 
1417         case DSO_ACCEPTMODE:
1418                 if (sock->state == SS_CONNECTED)
1419                         return -EISCONN;
1420                 if (scp->state != DN_O)
1421                         return -EINVAL;
1422 
1423                 if (optlen != sizeof(int))
1424                         return -EINVAL;
1425 
1426                 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1427                         return -EINVAL;
1428 
1429                 scp->accept_mode = (unsigned char)u.mode;
1430                 break;
1431 
1432         case DSO_CONACCEPT:
1433                 if (scp->state != DN_CR)
1434                         return -EINVAL;
1435                 timeo = sock_rcvtimeo(sk, 0);
1436                 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1437                 return err;
1438 
1439         case DSO_CONREJECT:
1440                 if (scp->state != DN_CR)
1441                         return -EINVAL;
1442 
1443                 scp->state = DN_DR;
1444                 sk->sk_shutdown = SHUTDOWN_MASK;
1445                 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1446                 break;
1447 
1448         default:
1449 #ifdef CONFIG_NETFILTER
1450                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1451 #endif
1452         case DSO_LINKINFO:
1453         case DSO_STREAM:
1454         case DSO_SEQPACKET:
1455                 return -ENOPROTOOPT;
1456 
1457         case DSO_MAXWINDOW:
1458                 if (optlen != sizeof(unsigned long))
1459                         return -EINVAL;
1460                 if (u.win > NSP_MAX_WINDOW)
1461                         u.win = NSP_MAX_WINDOW;
1462                 if (u.win == 0)
1463                         return -EINVAL;
1464                 scp->max_window = u.win;
1465                 if (scp->snd_window > u.win)
1466                         scp->snd_window = u.win;
1467                 break;
1468 
1469         case DSO_NODELAY:
1470                 if (optlen != sizeof(int))
1471                         return -EINVAL;
1472                 if (scp->nonagle == 2)
1473                         return -EINVAL;
1474                 scp->nonagle = (u.val == 0) ? 0 : 1;
1475                 /* if (scp->nonagle == 1) { Push pending frames } */
1476                 break;
1477 
1478         case DSO_CORK:
1479                 if (optlen != sizeof(int))
1480                         return -EINVAL;
1481                 if (scp->nonagle == 1)
1482                         return -EINVAL;
1483                 scp->nonagle = (u.val == 0) ? 0 : 2;
1484                 /* if (scp->nonagle == 0) { Push pending frames } */
1485                 break;
1486 
1487         case DSO_SERVICES:
1488                 if (optlen != sizeof(unsigned char))
1489                         return -EINVAL;
1490                 if ((u.services & ~NSP_FC_MASK) != 0x01)
1491                         return -EINVAL;
1492                 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1493                         return -EINVAL;
1494                 scp->services_loc = u.services;
1495                 break;
1496 
1497         case DSO_INFO:
1498                 if (optlen != sizeof(unsigned char))
1499                         return -EINVAL;
1500                 if (u.info & 0xfc)
1501                         return -EINVAL;
1502                 scp->info_loc = u.info;
1503                 break;
1504         }
1505 
1506         return 0;
1507 }
1508 
1509 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1510 {
1511         struct sock *sk = sock->sk;
1512         int err;
1513 
1514         lock_sock(sk);
1515         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1516         release_sock(sk);
1517 
1518         return err;
1519 }
1520 
1521 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1522 {
1523         struct  sock *sk = sock->sk;
1524         struct dn_scp *scp = DN_SK(sk);
1525         struct linkinfo_dn link;
1526         unsigned int r_len;
1527         void *r_data = NULL;
1528         unsigned int val;
1529 
1530         if(get_user(r_len , optlen))
1531                 return -EFAULT;
1532 
1533         switch (optname) {
1534         case DSO_CONDATA:
1535                 if (r_len > sizeof(struct optdata_dn))
1536                         r_len = sizeof(struct optdata_dn);
1537                 r_data = &scp->conndata_in;
1538                 break;
1539 
1540         case DSO_DISDATA:
1541                 if (r_len > sizeof(struct optdata_dn))
1542                         r_len = sizeof(struct optdata_dn);
1543                 r_data = &scp->discdata_in;
1544                 break;
1545 
1546         case DSO_CONACCESS:
1547                 if (r_len > sizeof(struct accessdata_dn))
1548                         r_len = sizeof(struct accessdata_dn);
1549                 r_data = &scp->accessdata;
1550                 break;
1551 
1552         case DSO_ACCEPTMODE:
1553                 if (r_len > sizeof(unsigned char))
1554                         r_len = sizeof(unsigned char);
1555                 r_data = &scp->accept_mode;
1556                 break;
1557 
1558         case DSO_LINKINFO:
1559                 if (r_len > sizeof(struct linkinfo_dn))
1560                         r_len = sizeof(struct linkinfo_dn);
1561 
1562                 memset(&link, 0, sizeof(link));
1563 
1564                 switch (sock->state) {
1565                 case SS_CONNECTING:
1566                         link.idn_linkstate = LL_CONNECTING;
1567                         break;
1568                 case SS_DISCONNECTING:
1569                         link.idn_linkstate = LL_DISCONNECTING;
1570                         break;
1571                 case SS_CONNECTED:
1572                         link.idn_linkstate = LL_RUNNING;
1573                         break;
1574                 default:
1575                         link.idn_linkstate = LL_INACTIVE;
1576                 }
1577 
1578                 link.idn_segsize = scp->segsize_rem;
1579                 r_data = &link;
1580                 break;
1581 
1582         default:
1583 #ifdef CONFIG_NETFILTER
1584         {
1585                 int ret, len;
1586 
1587                 if (get_user(len, optlen))
1588                         return -EFAULT;
1589 
1590                 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1591                 if (ret >= 0)
1592                         ret = put_user(len, optlen);
1593                 return ret;
1594         }
1595 #endif
1596         case DSO_STREAM:
1597         case DSO_SEQPACKET:
1598         case DSO_CONACCEPT:
1599         case DSO_CONREJECT:
1600                 return -ENOPROTOOPT;
1601 
1602         case DSO_MAXWINDOW:
1603                 if (r_len > sizeof(unsigned long))
1604                         r_len = sizeof(unsigned long);
1605                 r_data = &scp->max_window;
1606                 break;
1607 
1608         case DSO_NODELAY:
1609                 if (r_len > sizeof(int))
1610                         r_len = sizeof(int);
1611                 val = (scp->nonagle == 1);
1612                 r_data = &val;
1613                 break;
1614 
1615         case DSO_CORK:
1616                 if (r_len > sizeof(int))
1617                         r_len = sizeof(int);
1618                 val = (scp->nonagle == 2);
1619                 r_data = &val;
1620                 break;
1621 
1622         case DSO_SERVICES:
1623                 if (r_len > sizeof(unsigned char))
1624                         r_len = sizeof(unsigned char);
1625                 r_data = &scp->services_rem;
1626                 break;
1627 
1628         case DSO_INFO:
1629                 if (r_len > sizeof(unsigned char))
1630                         r_len = sizeof(unsigned char);
1631                 r_data = &scp->info_rem;
1632                 break;
1633         }
1634 
1635         if (r_data) {
1636                 if (copy_to_user(optval, r_data, r_len))
1637                         return -EFAULT;
1638                 if (put_user(r_len, optlen))
1639                         return -EFAULT;
1640         }
1641 
1642         return 0;
1643 }
1644 
1645 
1646 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1647 {
1648         struct sk_buff *skb;
1649         int len = 0;
1650 
1651         if (flags & MSG_OOB)
1652                 return !skb_queue_empty(q) ? 1 : 0;
1653 
1654         skb_queue_walk(q, skb) {
1655                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1656                 len += skb->len;
1657 
1658                 if (cb->nsp_flags & 0x40) {
1659                         /* SOCK_SEQPACKET reads to EOM */
1660                         if (sk->sk_type == SOCK_SEQPACKET)
1661                                 return 1;
1662                         /* so does SOCK_STREAM unless WAITALL is specified */
1663                         if (!(flags & MSG_WAITALL))
1664                                 return 1;
1665                 }
1666 
1667                 /* minimum data length for read exceeded */
1668                 if (len >= target)
1669                         return 1;
1670         }
1671 
1672         return 0;
1673 }
1674 
1675 
1676 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1677                       int flags)
1678 {
1679         struct sock *sk = sock->sk;
1680         struct dn_scp *scp = DN_SK(sk);
1681         struct sk_buff_head *queue = &sk->sk_receive_queue;
1682         size_t target = size > 1 ? 1 : 0;
1683         size_t copied = 0;
1684         int rv = 0;
1685         struct sk_buff *skb, *n;
1686         struct dn_skb_cb *cb = NULL;
1687         unsigned char eor = 0;
1688         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1689 
1690         lock_sock(sk);
1691 
1692         if (sock_flag(sk, SOCK_ZAPPED)) {
1693                 rv = -EADDRNOTAVAIL;
1694                 goto out;
1695         }
1696 
1697         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1698                 rv = 0;
1699                 goto out;
1700         }
1701 
1702         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1703         if (rv)
1704                 goto out;
1705 
1706         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1707                 rv = -EOPNOTSUPP;
1708                 goto out;
1709         }
1710 
1711         if (flags & MSG_OOB)
1712                 queue = &scp->other_receive_queue;
1713 
1714         if (flags & MSG_WAITALL)
1715                 target = size;
1716 
1717 
1718         /*
1719          * See if there is data ready to read, sleep if there isn't
1720          */
1721         for(;;) {
1722                 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1723 
1724                 if (sk->sk_err)
1725                         goto out;
1726 
1727                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1728                         if (!(flags & MSG_OOB)) {
1729                                 msg->msg_flags |= MSG_OOB;
1730                                 if (!scp->other_report) {
1731                                         scp->other_report = 1;
1732                                         goto out;
1733                                 }
1734                         }
1735                 }
1736 
1737                 if (scp->state != DN_RUN)
1738                         goto out;
1739 
1740                 if (signal_pending(current)) {
1741                         rv = sock_intr_errno(timeo);
1742                         goto out;
1743                 }
1744 
1745                 if (dn_data_ready(sk, queue, flags, target))
1746                         break;
1747 
1748                 if (flags & MSG_DONTWAIT) {
1749                         rv = -EWOULDBLOCK;
1750                         goto out;
1751                 }
1752 
1753                 add_wait_queue(sk_sleep(sk), &wait);
1754                 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1755                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1756                 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1757                 remove_wait_queue(sk_sleep(sk), &wait);
1758         }
1759 
1760         skb_queue_walk_safe(queue, skb, n) {
1761                 unsigned int chunk = skb->len;
1762                 cb = DN_SKB_CB(skb);
1763 
1764                 if ((chunk + copied) > size)
1765                         chunk = size - copied;
1766 
1767                 if (memcpy_to_msg(msg, skb->data, chunk)) {
1768                         rv = -EFAULT;
1769                         break;
1770                 }
1771                 copied += chunk;
1772 
1773                 if (!(flags & MSG_PEEK))
1774                         skb_pull(skb, chunk);
1775 
1776                 eor = cb->nsp_flags & 0x40;
1777 
1778                 if (skb->len == 0) {
1779                         skb_unlink(skb, queue);
1780                         kfree_skb(skb);
1781                         /*
1782                          * N.B. Don't refer to skb or cb after this point
1783                          * in loop.
1784                          */
1785                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1786                                 scp->flowloc_sw = DN_SEND;
1787                                 dn_nsp_send_link(sk, DN_SEND, 0);
1788                         }
1789                 }
1790 
1791                 if (eor) {
1792                         if (sk->sk_type == SOCK_SEQPACKET)
1793                                 break;
1794                         if (!(flags & MSG_WAITALL))
1795                                 break;
1796                 }
1797 
1798                 if (flags & MSG_OOB)
1799                         break;
1800 
1801                 if (copied >= target)
1802                         break;
1803         }
1804 
1805         rv = copied;
1806 
1807 
1808         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1809                 msg->msg_flags |= MSG_EOR;
1810 
1811 out:
1812         if (rv == 0)
1813                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1814 
1815         if ((rv >= 0) && msg->msg_name) {
1816                 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1817                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1818                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1819         }
1820 
1821         release_sock(sk);
1822 
1823         return rv;
1824 }
1825 
1826 
1827 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1828 {
1829         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1830         if (skb_queue_len(queue) >= scp->snd_window)
1831                 return 1;
1832         if (fctype != NSP_FC_NONE) {
1833                 if (flags & MSG_OOB) {
1834                         if (scp->flowrem_oth == 0)
1835                                 return 1;
1836                 } else {
1837                         if (scp->flowrem_dat == 0)
1838                                 return 1;
1839                 }
1840         }
1841         return 0;
1842 }
1843 
1844 /*
1845  * The DECnet spec requires that the "routing layer" accepts packets which
1846  * are at least 230 bytes in size. This excludes any headers which the NSP
1847  * layer might add, so we always assume that we'll be using the maximal
1848  * length header on data packets. The variation in length is due to the
1849  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1850  * make much practical difference.
1851  */
1852 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1853 {
1854         unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1855         if (dev) {
1856                 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1857                 mtu -= LL_RESERVED_SPACE(dev);
1858                 if (dn_db->use_long)
1859                         mtu -= 21;
1860                 else
1861                         mtu -= 6;
1862                 mtu -= DN_MAX_NSP_DATA_HEADER;
1863         } else {
1864                 /*
1865                  * 21 = long header, 16 = guess at MAC header length
1866                  */
1867                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1868         }
1869         if (mtu > mss)
1870                 mss = mtu;
1871         return mss;
1872 }
1873 
1874 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1875 {
1876         struct dst_entry *dst = __sk_dst_get(sk);
1877         struct dn_scp *scp = DN_SK(sk);
1878         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1879 
1880         /* Other data messages are limited to 16 bytes per packet */
1881         if (flags & MSG_OOB)
1882                 return 16;
1883 
1884         /* This works out the maximum size of segment we can send out */
1885         if (dst) {
1886                 u32 mtu = dst_mtu(dst);
1887                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1888         }
1889 
1890         return mss_now;
1891 }
1892 
1893 /*
1894  * N.B. We get the timeout wrong here, but then we always did get it
1895  * wrong before and this is another step along the road to correcting
1896  * it. It ought to get updated each time we pass through the routine,
1897  * but in practise it probably doesn't matter too much for now.
1898  */
1899 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1900                               unsigned long datalen, int noblock,
1901                               int *errcode)
1902 {
1903         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1904                                                    noblock, errcode);
1905         if (skb) {
1906                 skb->protocol = htons(ETH_P_DNA_RT);
1907                 skb->pkt_type = PACKET_OUTGOING;
1908         }
1909         return skb;
1910 }
1911 
1912 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1913 {
1914         struct sock *sk = sock->sk;
1915         struct dn_scp *scp = DN_SK(sk);
1916         size_t mss;
1917         struct sk_buff_head *queue = &scp->data_xmit_queue;
1918         int flags = msg->msg_flags;
1919         int err = 0;
1920         size_t sent = 0;
1921         int addr_len = msg->msg_namelen;
1922         DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1923         struct sk_buff *skb = NULL;
1924         struct dn_skb_cb *cb;
1925         size_t len;
1926         unsigned char fctype;
1927         long timeo;
1928 
1929         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1930                 return -EOPNOTSUPP;
1931 
1932         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1933                 return -EINVAL;
1934 
1935         lock_sock(sk);
1936         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1937         /*
1938          * The only difference between stream sockets and sequenced packet
1939          * sockets is that the stream sockets always behave as if MSG_EOR
1940          * has been set.
1941          */
1942         if (sock->type == SOCK_STREAM) {
1943                 if (flags & MSG_EOR) {
1944                         err = -EINVAL;
1945                         goto out;
1946                 }
1947                 flags |= MSG_EOR;
1948         }
1949 
1950 
1951         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1952         if (err)
1953                 goto out_err;
1954 
1955         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1956                 err = -EPIPE;
1957                 if (!(flags & MSG_NOSIGNAL))
1958                         send_sig(SIGPIPE, current, 0);
1959                 goto out_err;
1960         }
1961 
1962         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1963                 dst_negative_advice(sk);
1964 
1965         mss = scp->segsize_rem;
1966         fctype = scp->services_rem & NSP_FC_MASK;
1967 
1968         mss = dn_current_mss(sk, flags);
1969 
1970         if (flags & MSG_OOB) {
1971                 queue = &scp->other_xmit_queue;
1972                 if (size > mss) {
1973                         err = -EMSGSIZE;
1974                         goto out;
1975                 }
1976         }
1977 
1978         scp->persist_fxn = dn_nsp_xmit_timeout;
1979 
1980         while(sent < size) {
1981                 err = sock_error(sk);
1982                 if (err)
1983                         goto out;
1984 
1985                 if (signal_pending(current)) {
1986                         err = sock_intr_errno(timeo);
1987                         goto out;
1988                 }
1989 
1990                 /*
1991                  * Calculate size that we wish to send.
1992                  */
1993                 len = size - sent;
1994 
1995                 if (len > mss)
1996                         len = mss;
1997 
1998                 /*
1999                  * Wait for queue size to go down below the window
2000                  * size.
2001                  */
2002                 if (dn_queue_too_long(scp, queue, flags)) {
2003                         DEFINE_WAIT_FUNC(wait, woken_wake_function);
2004 
2005                         if (flags & MSG_DONTWAIT) {
2006                                 err = -EWOULDBLOCK;
2007                                 goto out;
2008                         }
2009 
2010                         add_wait_queue(sk_sleep(sk), &wait);
2011                         sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2012                         sk_wait_event(sk, &timeo,
2013                                       !dn_queue_too_long(scp, queue, flags), &wait);
2014                         sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2015                         remove_wait_queue(sk_sleep(sk), &wait);
2016                         continue;
2017                 }
2018 
2019                 /*
2020                  * Get a suitably sized skb.
2021                  * 64 is a bit of a hack really, but its larger than any
2022                  * link-layer headers and has served us well as a good
2023                  * guess as to their real length.
2024                  */
2025                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2026                                          flags & MSG_DONTWAIT, &err);
2027 
2028                 if (err)
2029                         break;
2030 
2031                 if (!skb)
2032                         continue;
2033 
2034                 cb = DN_SKB_CB(skb);
2035 
2036                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2037 
2038                 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2039                         err = -EFAULT;
2040                         goto out;
2041                 }
2042 
2043                 if (flags & MSG_OOB) {
2044                         cb->nsp_flags = 0x30;
2045                         if (fctype != NSP_FC_NONE)
2046                                 scp->flowrem_oth--;
2047                 } else {
2048                         cb->nsp_flags = 0x00;
2049                         if (scp->seg_total == 0)
2050                                 cb->nsp_flags |= 0x20;
2051 
2052                         scp->seg_total += len;
2053 
2054                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2055                                 cb->nsp_flags |= 0x40;
2056                                 scp->seg_total = 0;
2057                                 if (fctype == NSP_FC_SCMC)
2058                                         scp->flowrem_dat--;
2059                         }
2060                         if (fctype == NSP_FC_SRC)
2061                                 scp->flowrem_dat--;
2062                 }
2063 
2064                 sent += len;
2065                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2066                 skb = NULL;
2067 
2068                 scp->persist = dn_nsp_persist(sk);
2069 
2070         }
2071 out:
2072 
2073         kfree_skb(skb);
2074 
2075         release_sock(sk);
2076 
2077         return sent ? sent : err;
2078 
2079 out_err:
2080         err = sk_stream_error(sk, flags, err);
2081         release_sock(sk);
2082         return err;
2083 }
2084 
2085 static int dn_device_event(struct notifier_block *this, unsigned long event,
2086                            void *ptr)
2087 {
2088         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2089 
2090         if (!net_eq(dev_net(dev), &init_net))
2091                 return NOTIFY_DONE;
2092 
2093         switch (event) {
2094         case NETDEV_UP:
2095                 dn_dev_up(dev);
2096                 break;
2097         case NETDEV_DOWN:
2098                 dn_dev_down(dev);
2099                 break;
2100         default:
2101                 break;
2102         }
2103 
2104         return NOTIFY_DONE;
2105 }
2106 
2107 static struct notifier_block dn_dev_notifier = {
2108         .notifier_call = dn_device_event,
2109 };
2110 
2111 static struct packet_type dn_dix_packet_type __read_mostly = {
2112         .type =         cpu_to_be16(ETH_P_DNA_RT),
2113         .func =         dn_route_rcv,
2114 };
2115 
2116 #ifdef CONFIG_PROC_FS
2117 struct dn_iter_state {
2118         int bucket;
2119 };
2120 
2121 static struct sock *dn_socket_get_first(struct seq_file *seq)
2122 {
2123         struct dn_iter_state *state = seq->private;
2124         struct sock *n = NULL;
2125 
2126         for(state->bucket = 0;
2127             state->bucket < DN_SK_HASH_SIZE;
2128             ++state->bucket) {
2129                 n = sk_head(&dn_sk_hash[state->bucket]);
2130                 if (n)
2131                         break;
2132         }
2133 
2134         return n;
2135 }
2136 
2137 static struct sock *dn_socket_get_next(struct seq_file *seq,
2138                                        struct sock *n)
2139 {
2140         struct dn_iter_state *state = seq->private;
2141 
2142         n = sk_next(n);
2143 try_again:
2144         if (n)
2145                 goto out;
2146         if (++state->bucket >= DN_SK_HASH_SIZE)
2147                 goto out;
2148         n = sk_head(&dn_sk_hash[state->bucket]);
2149         goto try_again;
2150 out:
2151         return n;
2152 }
2153 
2154 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2155 {
2156         struct sock *sk = dn_socket_get_first(seq);
2157 
2158         if (sk) {
2159                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2160                         --*pos;
2161         }
2162         return *pos ? NULL : sk;
2163 }
2164 
2165 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2166 {
2167         void *rc;
2168         read_lock_bh(&dn_hash_lock);
2169         rc = socket_get_idx(seq, &pos);
2170         if (!rc) {
2171                 read_unlock_bh(&dn_hash_lock);
2172         }
2173         return rc;
2174 }
2175 
2176 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2177 {
2178         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2179 }
2180 
2181 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2182 {
2183         void *rc;
2184 
2185         if (v == SEQ_START_TOKEN) {
2186                 rc = dn_socket_get_idx(seq, 0);
2187                 goto out;
2188         }
2189 
2190         rc = dn_socket_get_next(seq, v);
2191         if (rc)
2192                 goto out;
2193         read_unlock_bh(&dn_hash_lock);
2194 out:
2195         ++*pos;
2196         return rc;
2197 }
2198 
2199 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2200 {
2201         if (v && v != SEQ_START_TOKEN)
2202                 read_unlock_bh(&dn_hash_lock);
2203 }
2204 
2205 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2206 
2207 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2208 {
2209         int i;
2210 
2211         switch (le16_to_cpu(dn->sdn_objnamel)) {
2212         case 0:
2213                 sprintf(buf, "%d", dn->sdn_objnum);
2214                 break;
2215         default:
2216                 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2217                         buf[i] = dn->sdn_objname[i];
2218                         if (IS_NOT_PRINTABLE(buf[i]))
2219                                 buf[i] = '.';
2220                 }
2221                 buf[i] = 0;
2222         }
2223 }
2224 
2225 static char *dn_state2asc(unsigned char state)
2226 {
2227         switch (state) {
2228         case DN_O:
2229                 return "OPEN";
2230         case DN_CR:
2231                 return "  CR";
2232         case DN_DR:
2233                 return "  DR";
2234         case DN_DRC:
2235                 return " DRC";
2236         case DN_CC:
2237                 return "  CC";
2238         case DN_CI:
2239                 return "  CI";
2240         case DN_NR:
2241                 return "  NR";
2242         case DN_NC:
2243                 return "  NC";
2244         case DN_CD:
2245                 return "  CD";
2246         case DN_RJ:
2247                 return "  RJ";
2248         case DN_RUN:
2249                 return " RUN";
2250         case DN_DI:
2251                 return "  DI";
2252         case DN_DIC:
2253                 return " DIC";
2254         case DN_DN:
2255                 return "  DN";
2256         case DN_CL:
2257                 return "  CL";
2258         case DN_CN:
2259                 return "  CN";
2260         }
2261 
2262         return "????";
2263 }
2264 
2265 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2266 {
2267         struct dn_scp *scp = DN_SK(sk);
2268         char buf1[DN_ASCBUF_LEN];
2269         char buf2[DN_ASCBUF_LEN];
2270         char local_object[DN_MAXOBJL+3];
2271         char remote_object[DN_MAXOBJL+3];
2272 
2273         dn_printable_object(&scp->addr, local_object);
2274         dn_printable_object(&scp->peer, remote_object);
2275 
2276         seq_printf(seq,
2277                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2278                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2279                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2280                    scp->addrloc,
2281                    scp->numdat,
2282                    scp->numoth,
2283                    scp->ackxmt_dat,
2284                    scp->ackxmt_oth,
2285                    scp->flowloc_sw,
2286                    local_object,
2287                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2288                    scp->addrrem,
2289                    scp->numdat_rcv,
2290                    scp->numoth_rcv,
2291                    scp->ackrcv_dat,
2292                    scp->ackrcv_oth,
2293                    scp->flowrem_sw,
2294                    remote_object,
2295                    dn_state2asc(scp->state),
2296                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2297 }
2298 
2299 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2300 {
2301         if (v == SEQ_START_TOKEN) {
2302                 seq_puts(seq, "Local                                              Remote\n");
2303         } else {
2304                 dn_socket_format_entry(seq, v);
2305         }
2306         return 0;
2307 }
2308 
2309 static const struct seq_operations dn_socket_seq_ops = {
2310         .start  = dn_socket_seq_start,
2311         .next   = dn_socket_seq_next,
2312         .stop   = dn_socket_seq_stop,
2313         .show   = dn_socket_seq_show,
2314 };
2315 
2316 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2317 {
2318         return seq_open_private(file, &dn_socket_seq_ops,
2319                         sizeof(struct dn_iter_state));
2320 }
2321 
2322 static const struct file_operations dn_socket_seq_fops = {
2323         .owner          = THIS_MODULE,
2324         .open           = dn_socket_seq_open,
2325         .read           = seq_read,
2326         .llseek         = seq_lseek,
2327         .release        = seq_release_private,
2328 };
2329 #endif
2330 
2331 static const struct net_proto_family    dn_family_ops = {
2332         .family =       AF_DECnet,
2333         .create =       dn_create,
2334         .owner  =       THIS_MODULE,
2335 };
2336 
2337 static const struct proto_ops dn_proto_ops = {
2338         .family =       AF_DECnet,
2339         .owner =        THIS_MODULE,
2340         .release =      dn_release,
2341         .bind =         dn_bind,
2342         .connect =      dn_connect,
2343         .socketpair =   sock_no_socketpair,
2344         .accept =       dn_accept,
2345         .getname =      dn_getname,
2346         .poll =         dn_poll,
2347         .ioctl =        dn_ioctl,
2348         .listen =       dn_listen,
2349         .shutdown =     dn_shutdown,
2350         .setsockopt =   dn_setsockopt,
2351         .getsockopt =   dn_getsockopt,
2352         .sendmsg =      dn_sendmsg,
2353         .recvmsg =      dn_recvmsg,
2354         .mmap =         sock_no_mmap,
2355         .sendpage =     sock_no_sendpage,
2356 };
2357 
2358 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