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Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux/fpc-iii.git] / net / decnet / af_decnet.c
blob3456cd331835c738286d6a2cf6c67a5de8aee16b
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/system.h>
123 #include <asm/ioctls.h>
124 #include <linux/capability.h>
125 #include <linux/mm.h>
126 #include <linux/interrupt.h>
127 #include <linux/proc_fs.h>
128 #include <linux/stat.h>
129 #include <linux/init.h>
130 #include <linux/poll.h>
131 #include <net/neighbour.h>
132 #include <net/dst.h>
133 #include <net/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_t decnet_memory_allocated;
158
159 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, 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[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 struct hlist_node *node;
179
180 if (port == 0)
181 return -1;
182
183 sk_for_each(sk, node, &dn_sk_hash[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(++port) != 0) {
198 if (port == i_port)
199 return 0;
200 }
201
202 scp->addrloc = 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 hash = addr->sdn_objnum;
254
255 if (hash == 0) {
256 hash = addr->sdn_objnamel;
257 for(i = 0; i < dn_ntohs(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++ = dn_ntohs(sdn->sdn_objnamel);
300 memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
301 len = 3 + dn_ntohs(sdn->sdn_objnamel);
302 break;
303 case 2:
304 memset(buf, 0, 5);
305 buf += 5;
306 *buf++ = dn_ntohs(sdn->sdn_objnamel);
307 memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
308 len = 7 + dn_ntohs(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 = dn_htons(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 = dn_htons(*data++);
364 len -= dn_ntohs(sdn->sdn_objnamel);
365
366 if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
367 return -1;
368
369 memcpy(sdn->sdn_objname, data, dn_ntohs(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 hlist_node *node;
378 struct sock *sk;
379
380 read_lock(&dn_hash_lock);
381 sk_for_each(sk, node, list) {
382 struct dn_scp *scp = DN_SK(sk);
383 if (sk->sk_state != TCP_LISTEN)
384 continue;
385 if (scp->addr.sdn_objnum) {
386 if (scp->addr.sdn_objnum != addr->sdn_objnum)
387 continue;
388 } else {
389 if (addr->sdn_objnum)
390 continue;
391 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
392 continue;
393 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
394 continue;
395 }
396 sock_hold(sk);
397 read_unlock(&dn_hash_lock);
398 return sk;
399 }
400
401 sk = sk_head(&dn_wild_sk);
402 if (sk) {
403 if (sk->sk_state == TCP_LISTEN)
404 sock_hold(sk);
405 else
406 sk = NULL;
407 }
408
409 read_unlock(&dn_hash_lock);
410 return sk;
411 }
412
413 struct sock *dn_find_by_skb(struct sk_buff *skb)
414 {
415 struct dn_skb_cb *cb = DN_SKB_CB(skb);
416 struct sock *sk;
417 struct hlist_node *node;
418 struct dn_scp *scp;
419
420 read_lock(&dn_hash_lock);
421 sk_for_each(sk, node, &dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK]) {
422 scp = DN_SK(sk);
423 if (cb->src != dn_saddr2dn(&scp->peer))
424 continue;
425 if (cb->dst_port != scp->addrloc)
426 continue;
427 if (scp->addrrem && (cb->src_port != scp->addrrem))
428 continue;
429 sock_hold(sk);
430 goto found;
431 }
432 sk = NULL;
433 found:
434 read_unlock(&dn_hash_lock);
435 return sk;
436 }
437
438
439
440 static void dn_destruct(struct sock *sk)
441 {
442 struct dn_scp *scp = DN_SK(sk);
443
444 skb_queue_purge(&scp->data_xmit_queue);
445 skb_queue_purge(&scp->other_xmit_queue);
446 skb_queue_purge(&scp->other_receive_queue);
447
448 dst_release(xchg(&sk->sk_dst_cache, NULL));
449 }
450
451 static int dn_memory_pressure;
452
453 static void dn_enter_memory_pressure(void)
454 {
455 if (!dn_memory_pressure) {
456 dn_memory_pressure = 1;
457 }
458 }
459
460 static struct proto dn_proto = {
461 .name = "NSP",
462 .owner = THIS_MODULE,
463 .enter_memory_pressure = dn_enter_memory_pressure,
464 .memory_pressure = &dn_memory_pressure,
465 .memory_allocated = &decnet_memory_allocated,
466 .sysctl_mem = sysctl_decnet_mem,
467 .sysctl_wmem = sysctl_decnet_wmem,
468 .sysctl_rmem = sysctl_decnet_rmem,
469 .max_header = DN_MAX_NSP_DATA_HEADER + 64,
470 .obj_size = sizeof(struct dn_sock),
471 };
472
473 static struct sock *dn_alloc_sock(struct socket *sock, gfp_t gfp)
474 {
475 struct dn_scp *scp;
476 struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
477
478 if (!sk)
479 goto out;
480
481 if (sock)
482 sock->ops = &dn_proto_ops;
483 sock_init_data(sock, sk);
484
485 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
486 sk->sk_destruct = dn_destruct;
487 sk->sk_no_check = 1;
488 sk->sk_family = PF_DECnet;
489 sk->sk_protocol = 0;
490 sk->sk_allocation = gfp;
491 sk->sk_sndbuf = sysctl_decnet_wmem[1];
492 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
493
494 /* Initialization of DECnet Session Control Port */
495 scp = DN_SK(sk);
496 scp->state = DN_O; /* Open */
497 scp->numdat = 1; /* Next data seg to tx */
498 scp->numoth = 1; /* Next oth data to tx */
499 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
500 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
501 scp->ackrcv_dat = 0; /* Highest data ack recv*/
502 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
503 scp->flowrem_sw = DN_SEND;
504 scp->flowloc_sw = DN_SEND;
505 scp->flowrem_dat = 0;
506 scp->flowrem_oth = 1;
507 scp->flowloc_dat = 0;
508 scp->flowloc_oth = 1;
509 scp->services_rem = 0;
510 scp->services_loc = 1 | NSP_FC_NONE;
511 scp->info_rem = 0;
512 scp->info_loc = 0x03; /* NSP version 4.1 */
513 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
514 scp->nonagle = 0;
515 scp->multi_ireq = 1;
516 scp->accept_mode = ACC_IMMED;
517 scp->addr.sdn_family = AF_DECnet;
518 scp->peer.sdn_family = AF_DECnet;
519 scp->accessdata.acc_accl = 5;
520 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
521
522 scp->max_window = NSP_MAX_WINDOW;
523 scp->snd_window = NSP_MIN_WINDOW;
524 scp->nsp_srtt = NSP_INITIAL_SRTT;
525 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
526 scp->nsp_rxtshift = 0;
527
528 skb_queue_head_init(&scp->data_xmit_queue);
529 skb_queue_head_init(&scp->other_xmit_queue);
530 skb_queue_head_init(&scp->other_receive_queue);
531
532 scp->persist = 0;
533 scp->persist_fxn = NULL;
534 scp->keepalive = 10 * HZ;
535 scp->keepalive_fxn = dn_keepalive;
536
537 init_timer(&scp->delack_timer);
538 scp->delack_pending = 0;
539 scp->delack_fxn = dn_nsp_delayed_ack;
540
541 dn_start_slow_timer(sk);
542 out:
543 return sk;
544 }
545
546 /*
547 * Keepalive timer.
548 * FIXME: Should respond to SO_KEEPALIVE etc.
549 */
550 static void dn_keepalive(struct sock *sk)
551 {
552 struct dn_scp *scp = DN_SK(sk);
553
554 /*
555 * By checking the other_data transmit queue is empty
556 * we are double checking that we are not sending too
557 * many of these keepalive frames.
558 */
559 if (skb_queue_empty(&scp->other_xmit_queue))
560 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
561 }
562
563
564 /*
565 * Timer for shutdown/destroyed sockets.
566 * When socket is dead & no packets have been sent for a
567 * certain amount of time, they are removed by this
568 * routine. Also takes care of sending out DI & DC
569 * frames at correct times.
570 */
571 int dn_destroy_timer(struct sock *sk)
572 {
573 struct dn_scp *scp = DN_SK(sk);
574
575 scp->persist = dn_nsp_persist(sk);
576
577 switch(scp->state) {
578 case DN_DI:
579 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
580 if (scp->nsp_rxtshift >= decnet_di_count)
581 scp->state = DN_CN;
582 return 0;
583
584 case DN_DR:
585 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
586 if (scp->nsp_rxtshift >= decnet_dr_count)
587 scp->state = DN_DRC;
588 return 0;
589
590 case DN_DN:
591 if (scp->nsp_rxtshift < decnet_dn_count) {
592 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
593 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
594 return 0;
595 }
596 }
597
598 scp->persist = (HZ * decnet_time_wait);
599
600 if (sk->sk_socket)
601 return 0;
602
603 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
604 dn_unhash_sock(sk);
605 sock_put(sk);
606 return 1;
607 }
608
609 return 0;
610 }
611
612 static void dn_destroy_sock(struct sock *sk)
613 {
614 struct dn_scp *scp = DN_SK(sk);
615
616 scp->nsp_rxtshift = 0; /* reset back off */
617
618 if (sk->sk_socket) {
619 if (sk->sk_socket->state != SS_UNCONNECTED)
620 sk->sk_socket->state = SS_DISCONNECTING;
621 }
622
623 sk->sk_state = TCP_CLOSE;
624
625 switch(scp->state) {
626 case DN_DN:
627 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
628 sk->sk_allocation);
629 scp->persist_fxn = dn_destroy_timer;
630 scp->persist = dn_nsp_persist(sk);
631 break;
632 case DN_CR:
633 scp->state = DN_DR;
634 goto disc_reject;
635 case DN_RUN:
636 scp->state = DN_DI;
637 case DN_DI:
638 case DN_DR:
639 disc_reject:
640 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
641 case DN_NC:
642 case DN_NR:
643 case DN_RJ:
644 case DN_DIC:
645 case DN_CN:
646 case DN_DRC:
647 case DN_CI:
648 case DN_CD:
649 scp->persist_fxn = dn_destroy_timer;
650 scp->persist = dn_nsp_persist(sk);
651 break;
652 default:
653 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
654 case DN_O:
655 dn_stop_slow_timer(sk);
656
657 dn_unhash_sock_bh(sk);
658 sock_put(sk);
659
660 break;
661 }
662 }
663
664 char *dn_addr2asc(__u16 addr, char *buf)
665 {
666 unsigned short node, area;
667
668 node = addr & 0x03ff;
669 area = addr >> 10;
670 sprintf(buf, "%hd.%hd", area, node);
671
672 return buf;
673 }
674
675
676
677 static int dn_create(struct socket *sock, int protocol)
678 {
679 struct sock *sk;
680
681 switch(sock->type) {
682 case SOCK_SEQPACKET:
683 if (protocol != DNPROTO_NSP)
684 return -EPROTONOSUPPORT;
685 break;
686 case SOCK_STREAM:
687 break;
688 default:
689 return -ESOCKTNOSUPPORT;
690 }
691
692
693 if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
694 return -ENOBUFS;
695
696 sk->sk_protocol = protocol;
697
698 return 0;
699 }
700
701
702 static int
703 dn_release(struct socket *sock)
704 {
705 struct sock *sk = sock->sk;
706
707 if (sk) {
708 sock_orphan(sk);
709 sock_hold(sk);
710 lock_sock(sk);
711 dn_destroy_sock(sk);
712 release_sock(sk);
713 sock_put(sk);
714 }
715
716 return 0;
717 }
718
719 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
720 {
721 struct sock *sk = sock->sk;
722 struct dn_scp *scp = DN_SK(sk);
723 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
724 struct net_device *dev;
725 int rv;
726
727 if (addr_len != sizeof(struct sockaddr_dn))
728 return -EINVAL;
729
730 if (saddr->sdn_family != AF_DECnet)
731 return -EINVAL;
732
733 if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
734 return -EINVAL;
735
736 if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
737 return -EINVAL;
738
739 if (saddr->sdn_flags & ~SDF_WILD)
740 return -EINVAL;
741
742 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
743 (saddr->sdn_flags & SDF_WILD)))
744 return -EACCES;
745
746 if (!(saddr->sdn_flags & SDF_WILD)) {
747 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
748 read_lock(&dev_base_lock);
749 for(dev = dev_base; dev; dev = dev->next) {
750 if (!dev->dn_ptr)
751 continue;
752 if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
753 break;
754 }
755 read_unlock(&dev_base_lock);
756 if (dev == NULL)
757 return -EADDRNOTAVAIL;
758 }
759 }
760
761 rv = -EINVAL;
762 lock_sock(sk);
763 if (sock_flag(sk, SOCK_ZAPPED)) {
764 memcpy(&scp->addr, saddr, addr_len);
765 sock_reset_flag(sk, SOCK_ZAPPED);
766
767 rv = dn_hash_sock(sk);
768 if (rv)
769 sock_set_flag(sk, SOCK_ZAPPED);
770 }
771 release_sock(sk);
772
773 return rv;
774 }
775
776
777 static int dn_auto_bind(struct socket *sock)
778 {
779 struct sock *sk = sock->sk;
780 struct dn_scp *scp = DN_SK(sk);
781 int rv;
782
783 sock_reset_flag(sk, SOCK_ZAPPED);
784
785 scp->addr.sdn_flags = 0;
786 scp->addr.sdn_objnum = 0;
787
788 /*
789 * This stuff is to keep compatibility with Eduardo's
790 * patch. I hope I can dispense with it shortly...
791 */
792 if ((scp->accessdata.acc_accl != 0) &&
793 (scp->accessdata.acc_accl <= 12)) {
794
795 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
796 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
797
798 scp->accessdata.acc_accl = 0;
799 memset(scp->accessdata.acc_acc, 0, 40);
800 }
801 /* End of compatibility stuff */
802
803 scp->addr.sdn_add.a_len = dn_htons(2);
804 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
805 if (rv == 0) {
806 rv = dn_hash_sock(sk);
807 if (rv)
808 sock_set_flag(sk, SOCK_ZAPPED);
809 }
810
811 return rv;
812 }
813
814 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
815 {
816 struct dn_scp *scp = DN_SK(sk);
817 DEFINE_WAIT(wait);
818 int err;
819
820 if (scp->state != DN_CR)
821 return -EINVAL;
822
823 scp->state = DN_CC;
824 scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
825 dn_send_conn_conf(sk, allocation);
826
827 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
828 for(;;) {
829 release_sock(sk);
830 if (scp->state == DN_CC)
831 *timeo = schedule_timeout(*timeo);
832 lock_sock(sk);
833 err = 0;
834 if (scp->state == DN_RUN)
835 break;
836 err = sock_error(sk);
837 if (err)
838 break;
839 err = sock_intr_errno(*timeo);
840 if (signal_pending(current))
841 break;
842 err = -EAGAIN;
843 if (!*timeo)
844 break;
845 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
846 }
847 finish_wait(sk->sk_sleep, &wait);
848 if (err == 0) {
849 sk->sk_socket->state = SS_CONNECTED;
850 } else if (scp->state != DN_CC) {
851 sk->sk_socket->state = SS_UNCONNECTED;
852 }
853 return err;
854 }
855
856 static int dn_wait_run(struct sock *sk, long *timeo)
857 {
858 struct dn_scp *scp = DN_SK(sk);
859 DEFINE_WAIT(wait);
860 int err = 0;
861
862 if (scp->state == DN_RUN)
863 goto out;
864
865 if (!*timeo)
866 return -EALREADY;
867
868 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
869 for(;;) {
870 release_sock(sk);
871 if (scp->state == DN_CI || scp->state == DN_CC)
872 *timeo = schedule_timeout(*timeo);
873 lock_sock(sk);
874 err = 0;
875 if (scp->state == DN_RUN)
876 break;
877 err = sock_error(sk);
878 if (err)
879 break;
880 err = sock_intr_errno(*timeo);
881 if (signal_pending(current))
882 break;
883 err = -ETIMEDOUT;
884 if (!*timeo)
885 break;
886 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
887 }
888 finish_wait(sk->sk_sleep, &wait);
889 out:
890 if (err == 0) {
891 sk->sk_socket->state = SS_CONNECTED;
892 } else if (scp->state != DN_CI && scp->state != DN_CC) {
893 sk->sk_socket->state = SS_UNCONNECTED;
894 }
895 return err;
896 }
897
898 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
899 {
900 struct socket *sock = sk->sk_socket;
901 struct dn_scp *scp = DN_SK(sk);
902 int err = -EISCONN;
903 struct flowi fl;
904
905 if (sock->state == SS_CONNECTED)
906 goto out;
907
908 if (sock->state == SS_CONNECTING) {
909 err = 0;
910 if (scp->state == DN_RUN) {
911 sock->state = SS_CONNECTED;
912 goto out;
913 }
914 err = -ECONNREFUSED;
915 if (scp->state != DN_CI && scp->state != DN_CC) {
916 sock->state = SS_UNCONNECTED;
917 goto out;
918 }
919 return dn_wait_run(sk, timeo);
920 }
921
922 err = -EINVAL;
923 if (scp->state != DN_O)
924 goto out;
925
926 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
927 goto out;
928 if (addr->sdn_family != AF_DECnet)
929 goto out;
930 if (addr->sdn_flags & SDF_WILD)
931 goto out;
932
933 if (sock_flag(sk, SOCK_ZAPPED)) {
934 err = dn_auto_bind(sk->sk_socket);
935 if (err)
936 goto out;
937 }
938
939 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
940
941 err = -EHOSTUNREACH;
942 memset(&fl, 0, sizeof(fl));
943 fl.oif = sk->sk_bound_dev_if;
944 fl.fld_dst = dn_saddr2dn(&scp->peer);
945 fl.fld_src = dn_saddr2dn(&scp->addr);
946 dn_sk_ports_copy(&fl, scp);
947 fl.proto = DNPROTO_NSP;
948 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
949 goto out;
950 sk->sk_route_caps = sk->sk_dst_cache->dev->features;
951 sock->state = SS_CONNECTING;
952 scp->state = DN_CI;
953 scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
954
955 dn_nsp_send_conninit(sk, NSP_CI);
956 err = -EINPROGRESS;
957 if (*timeo) {
958 err = dn_wait_run(sk, timeo);
959 }
960 out:
961 return err;
962 }
963
964 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
965 {
966 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
967 struct sock *sk = sock->sk;
968 int err;
969 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
970
971 lock_sock(sk);
972 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
973 release_sock(sk);
974
975 return err;
976 }
977
978 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
979 {
980 struct dn_scp *scp = DN_SK(sk);
981
982 switch(scp->state) {
983 case DN_RUN:
984 return 0;
985 case DN_CR:
986 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
987 case DN_CI:
988 case DN_CC:
989 return dn_wait_run(sk, timeo);
990 case DN_O:
991 return __dn_connect(sk, addr, addrlen, timeo, flags);
992 }
993
994 return -EINVAL;
995 }
996
997
998 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
999 {
1000 unsigned char *ptr = skb->data;
1001
1002 acc->acc_userl = *ptr++;
1003 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1004 ptr += acc->acc_userl;
1005
1006 acc->acc_passl = *ptr++;
1007 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1008 ptr += acc->acc_passl;
1009
1010 acc->acc_accl = *ptr++;
1011 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1012
1013 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1014
1015 }
1016
1017 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1018 {
1019 unsigned char *ptr = skb->data;
1020
1021 opt->opt_optl = *ptr++;
1022 opt->opt_status = 0;
1023 memcpy(opt->opt_data, ptr, opt->opt_optl);
1024 skb_pull(skb, dn_ntohs(opt->opt_optl) + 1);
1025
1026 }
1027
1028 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1029 {
1030 DEFINE_WAIT(wait);
1031 struct sk_buff *skb = NULL;
1032 int err = 0;
1033
1034 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1035 for(;;) {
1036 release_sock(sk);
1037 skb = skb_dequeue(&sk->sk_receive_queue);
1038 if (skb == NULL) {
1039 *timeo = schedule_timeout(*timeo);
1040 skb = skb_dequeue(&sk->sk_receive_queue);
1041 }
1042 lock_sock(sk);
1043 if (skb != NULL)
1044 break;
1045 err = -EINVAL;
1046 if (sk->sk_state != TCP_LISTEN)
1047 break;
1048 err = sock_intr_errno(*timeo);
1049 if (signal_pending(current))
1050 break;
1051 err = -EAGAIN;
1052 if (!*timeo)
1053 break;
1054 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1055 }
1056 finish_wait(sk->sk_sleep, &wait);
1057
1058 return skb == NULL ? ERR_PTR(err) : skb;
1059 }
1060
1061 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1062 {
1063 struct sock *sk = sock->sk, *newsk;
1064 struct sk_buff *skb = NULL;
1065 struct dn_skb_cb *cb;
1066 unsigned char menuver;
1067 int err = 0;
1068 unsigned char type;
1069 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1070
1071 lock_sock(sk);
1072
1073 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1074 release_sock(sk);
1075 return -EINVAL;
1076 }
1077
1078 skb = skb_dequeue(&sk->sk_receive_queue);
1079 if (skb == NULL) {
1080 skb = dn_wait_for_connect(sk, &timeo);
1081 if (IS_ERR(skb)) {
1082 release_sock(sk);
1083 return PTR_ERR(skb);
1084 }
1085 }
1086
1087 cb = DN_SKB_CB(skb);
1088 sk->sk_ack_backlog--;
1089 newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1090 if (newsk == NULL) {
1091 release_sock(sk);
1092 kfree_skb(skb);
1093 return -ENOBUFS;
1094 }
1095 release_sock(sk);
1096
1097 dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1098 skb->dst = NULL;
1099
1100 DN_SK(newsk)->state = DN_CR;
1101 DN_SK(newsk)->addrrem = cb->src_port;
1102 DN_SK(newsk)->services_rem = cb->services;
1103 DN_SK(newsk)->info_rem = cb->info;
1104 DN_SK(newsk)->segsize_rem = cb->segsize;
1105 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1106
1107 if (DN_SK(newsk)->segsize_rem < 230)
1108 DN_SK(newsk)->segsize_rem = 230;
1109
1110 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1111 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1112
1113 newsk->sk_state = TCP_LISTEN;
1114 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1115
1116 /*
1117 * If we are listening on a wild socket, we don't want
1118 * the newly created socket on the wrong hash queue.
1119 */
1120 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1121
1122 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1123 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1124 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1125 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1126
1127 menuver = *skb->data;
1128 skb_pull(skb, 1);
1129
1130 if (menuver & DN_MENUVER_ACC)
1131 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1132
1133 if (menuver & DN_MENUVER_USR)
1134 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1135
1136 if (menuver & DN_MENUVER_PRX)
1137 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1138
1139 if (menuver & DN_MENUVER_UIC)
1140 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1141
1142 kfree_skb(skb);
1143
1144 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1145 sizeof(struct optdata_dn));
1146 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1147 sizeof(struct optdata_dn));
1148
1149 lock_sock(newsk);
1150 err = dn_hash_sock(newsk);
1151 if (err == 0) {
1152 sock_reset_flag(newsk, SOCK_ZAPPED);
1153 dn_send_conn_ack(newsk);
1154
1155 /*
1156 * Here we use sk->sk_allocation since although the conn conf is
1157 * for the newsk, the context is the old socket.
1158 */
1159 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1160 err = dn_confirm_accept(newsk, &timeo,
1161 sk->sk_allocation);
1162 }
1163 release_sock(newsk);
1164 return err;
1165 }
1166
1167
1168 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1169 {
1170 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1171 struct sock *sk = sock->sk;
1172 struct dn_scp *scp = DN_SK(sk);
1173
1174 *uaddr_len = sizeof(struct sockaddr_dn);
1175
1176 lock_sock(sk);
1177
1178 if (peer) {
1179 if ((sock->state != SS_CONNECTED &&
1180 sock->state != SS_CONNECTING) &&
1181 scp->accept_mode == ACC_IMMED) {
1182 release_sock(sk);
1183 return -ENOTCONN;
1184 }
1185
1186 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1187 } else {
1188 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1189 }
1190
1191 release_sock(sk);
1192
1193 return 0;
1194 }
1195
1196
1197 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1198 {
1199 struct sock *sk = sock->sk;
1200 struct dn_scp *scp = DN_SK(sk);
1201 int mask = datagram_poll(file, sock, wait);
1202
1203 if (!skb_queue_empty(&scp->other_receive_queue))
1204 mask |= POLLRDBAND;
1205
1206 return mask;
1207 }
1208
1209 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1210 {
1211 struct sock *sk = sock->sk;
1212 struct dn_scp *scp = DN_SK(sk);
1213 int err = -EOPNOTSUPP;
1214 long amount = 0;
1215 struct sk_buff *skb;
1216 int val;
1217
1218 switch(cmd)
1219 {
1220 case SIOCGIFADDR:
1221 case SIOCSIFADDR:
1222 return dn_dev_ioctl(cmd, (void __user *)arg);
1223
1224 case SIOCATMARK:
1225 lock_sock(sk);
1226 val = !skb_queue_empty(&scp->other_receive_queue);
1227 if (scp->state != DN_RUN)
1228 val = -ENOTCONN;
1229 release_sock(sk);
1230 return val;
1231
1232 case TIOCOUTQ:
1233 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1234 if (amount < 0)
1235 amount = 0;
1236 err = put_user(amount, (int __user *)arg);
1237 break;
1238
1239 case TIOCINQ:
1240 lock_sock(sk);
1241 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1242 amount = skb->len;
1243 } else {
1244 struct sk_buff *skb = sk->sk_receive_queue.next;
1245 for(;;) {
1246 if (skb ==
1247 (struct sk_buff *)&sk->sk_receive_queue)
1248 break;
1249 amount += skb->len;
1250 skb = skb->next;
1251 }
1252 }
1253 release_sock(sk);
1254 err = put_user(amount, (int __user *)arg);
1255 break;
1256
1257 default:
1258 err = -ENOIOCTLCMD;
1259 break;
1260 }
1261
1262 return err;
1263 }
1264
1265 static int dn_listen(struct socket *sock, int backlog)
1266 {
1267 struct sock *sk = sock->sk;
1268 int err = -EINVAL;
1269
1270 lock_sock(sk);
1271
1272 if (sock_flag(sk, SOCK_ZAPPED))
1273 goto out;
1274
1275 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1276 goto out;
1277
1278 sk->sk_max_ack_backlog = backlog;
1279 sk->sk_ack_backlog = 0;
1280 sk->sk_state = TCP_LISTEN;
1281 err = 0;
1282 dn_rehash_sock(sk);
1283
1284 out:
1285 release_sock(sk);
1286
1287 return err;
1288 }
1289
1290
1291 static int dn_shutdown(struct socket *sock, int how)
1292 {
1293 struct sock *sk = sock->sk;
1294 struct dn_scp *scp = DN_SK(sk);
1295 int err = -ENOTCONN;
1296
1297 lock_sock(sk);
1298
1299 if (sock->state == SS_UNCONNECTED)
1300 goto out;
1301
1302 err = 0;
1303 if (sock->state == SS_DISCONNECTING)
1304 goto out;
1305
1306 err = -EINVAL;
1307 if (scp->state == DN_O)
1308 goto out;
1309
1310 if (how != SHUTDOWN_MASK)
1311 goto out;
1312
1313 sk->sk_shutdown = how;
1314 dn_destroy_sock(sk);
1315 err = 0;
1316
1317 out:
1318 release_sock(sk);
1319
1320 return err;
1321 }
1322
1323 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1324 {
1325 struct sock *sk = sock->sk;
1326 int err;
1327
1328 lock_sock(sk);
1329 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1330 release_sock(sk);
1331
1332 return err;
1333 }
1334
1335 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1336 {
1337 struct sock *sk = sock->sk;
1338 struct dn_scp *scp = DN_SK(sk);
1339 long timeo;
1340 union {
1341 struct optdata_dn opt;
1342 struct accessdata_dn acc;
1343 int mode;
1344 unsigned long win;
1345 int val;
1346 unsigned char services;
1347 unsigned char info;
1348 } u;
1349 int err;
1350
1351 if (optlen && !optval)
1352 return -EINVAL;
1353
1354 if (optlen > sizeof(u))
1355 return -EINVAL;
1356
1357 if (copy_from_user(&u, optval, optlen))
1358 return -EFAULT;
1359
1360 switch(optname) {
1361 case DSO_CONDATA:
1362 if (sock->state == SS_CONNECTED)
1363 return -EISCONN;
1364 if ((scp->state != DN_O) && (scp->state != DN_CR))
1365 return -EINVAL;
1366
1367 if (optlen != sizeof(struct optdata_dn))
1368 return -EINVAL;
1369
1370 if (dn_ntohs(u.opt.opt_optl) > 16)
1371 return -EINVAL;
1372
1373 memcpy(&scp->conndata_out, &u.opt, optlen);
1374 break;
1375
1376 case DSO_DISDATA:
1377 if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1378 return -ENOTCONN;
1379
1380 if (optlen != sizeof(struct optdata_dn))
1381 return -EINVAL;
1382
1383 if (dn_ntohs(u.opt.opt_optl) > 16)
1384 return -EINVAL;
1385
1386 memcpy(&scp->discdata_out, &u.opt, optlen);
1387 break;
1388
1389 case DSO_CONACCESS:
1390 if (sock->state == SS_CONNECTED)
1391 return -EISCONN;
1392 if (scp->state != DN_O)
1393 return -EINVAL;
1394
1395 if (optlen != sizeof(struct accessdata_dn))
1396 return -EINVAL;
1397
1398 if ((u.acc.acc_accl > DN_MAXACCL) ||
1399 (u.acc.acc_passl > DN_MAXACCL) ||
1400 (u.acc.acc_userl > DN_MAXACCL))
1401 return -EINVAL;
1402
1403 memcpy(&scp->accessdata, &u.acc, optlen);
1404 break;
1405
1406 case DSO_ACCEPTMODE:
1407 if (sock->state == SS_CONNECTED)
1408 return -EISCONN;
1409 if (scp->state != DN_O)
1410 return -EINVAL;
1411
1412 if (optlen != sizeof(int))
1413 return -EINVAL;
1414
1415 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1416 return -EINVAL;
1417
1418 scp->accept_mode = (unsigned char)u.mode;
1419 break;
1420
1421 case DSO_CONACCEPT:
1422
1423 if (scp->state != DN_CR)
1424 return -EINVAL;
1425 timeo = sock_rcvtimeo(sk, 0);
1426 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1427 return err;
1428
1429 case DSO_CONREJECT:
1430
1431 if (scp->state != DN_CR)
1432 return -EINVAL;
1433
1434 scp->state = DN_DR;
1435 sk->sk_shutdown = SHUTDOWN_MASK;
1436 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1437 break;
1438
1439 default:
1440 #ifdef CONFIG_NETFILTER
1441 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1442 #endif
1443 case DSO_LINKINFO:
1444 case DSO_STREAM:
1445 case DSO_SEQPACKET:
1446 return -ENOPROTOOPT;
1447
1448 case DSO_MAXWINDOW:
1449 if (optlen != sizeof(unsigned long))
1450 return -EINVAL;
1451 if (u.win > NSP_MAX_WINDOW)
1452 u.win = NSP_MAX_WINDOW;
1453 if (u.win == 0)
1454 return -EINVAL;
1455 scp->max_window = u.win;
1456 if (scp->snd_window > u.win)
1457 scp->snd_window = u.win;
1458 break;
1459
1460 case DSO_NODELAY:
1461 if (optlen != sizeof(int))
1462 return -EINVAL;
1463 if (scp->nonagle == 2)
1464 return -EINVAL;
1465 scp->nonagle = (u.val == 0) ? 0 : 1;
1466 /* if (scp->nonagle == 1) { Push pending frames } */
1467 break;
1468
1469 case DSO_CORK:
1470 if (optlen != sizeof(int))
1471 return -EINVAL;
1472 if (scp->nonagle == 1)
1473 return -EINVAL;
1474 scp->nonagle = (u.val == 0) ? 0 : 2;
1475 /* if (scp->nonagle == 0) { Push pending frames } */
1476 break;
1477
1478 case DSO_SERVICES:
1479 if (optlen != sizeof(unsigned char))
1480 return -EINVAL;
1481 if ((u.services & ~NSP_FC_MASK) != 0x01)
1482 return -EINVAL;
1483 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1484 return -EINVAL;
1485 scp->services_loc = u.services;
1486 break;
1487
1488 case DSO_INFO:
1489 if (optlen != sizeof(unsigned char))
1490 return -EINVAL;
1491 if (u.info & 0xfc)
1492 return -EINVAL;
1493 scp->info_loc = u.info;
1494 break;
1495 }
1496
1497 return 0;
1498 }
1499
1500 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1501 {
1502 struct sock *sk = sock->sk;
1503 int err;
1504
1505 lock_sock(sk);
1506 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1507 release_sock(sk);
1508
1509 return err;
1510 }
1511
1512 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1513 {
1514 struct sock *sk = sock->sk;
1515 struct dn_scp *scp = DN_SK(sk);
1516 struct linkinfo_dn link;
1517 unsigned int r_len;
1518 void *r_data = NULL;
1519 unsigned int val;
1520
1521 if(get_user(r_len , optlen))
1522 return -EFAULT;
1523
1524 switch(optname) {
1525 case DSO_CONDATA:
1526 if (r_len > sizeof(struct optdata_dn))
1527 r_len = sizeof(struct optdata_dn);
1528 r_data = &scp->conndata_in;
1529 break;
1530
1531 case DSO_DISDATA:
1532 if (r_len > sizeof(struct optdata_dn))
1533 r_len = sizeof(struct optdata_dn);
1534 r_data = &scp->discdata_in;
1535 break;
1536
1537 case DSO_CONACCESS:
1538 if (r_len > sizeof(struct accessdata_dn))
1539 r_len = sizeof(struct accessdata_dn);
1540 r_data = &scp->accessdata;
1541 break;
1542
1543 case DSO_ACCEPTMODE:
1544 if (r_len > sizeof(unsigned char))
1545 r_len = sizeof(unsigned char);
1546 r_data = &scp->accept_mode;
1547 break;
1548
1549 case DSO_LINKINFO:
1550 if (r_len > sizeof(struct linkinfo_dn))
1551 r_len = sizeof(struct linkinfo_dn);
1552
1553 switch(sock->state) {
1554 case SS_CONNECTING:
1555 link.idn_linkstate = LL_CONNECTING;
1556 break;
1557 case SS_DISCONNECTING:
1558 link.idn_linkstate = LL_DISCONNECTING;
1559 break;
1560 case SS_CONNECTED:
1561 link.idn_linkstate = LL_RUNNING;
1562 break;
1563 default:
1564 link.idn_linkstate = LL_INACTIVE;
1565 }
1566
1567 link.idn_segsize = scp->segsize_rem;
1568 r_data = &link;
1569 break;
1570
1571 default:
1572 #ifdef CONFIG_NETFILTER
1573 {
1574 int val, len;
1575
1576 if(get_user(len, optlen))
1577 return -EFAULT;
1578
1579 val = nf_getsockopt(sk, PF_DECnet, optname,
1580 optval, &len);
1581 if (val >= 0)
1582 val = put_user(len, optlen);
1583 return val;
1584 }
1585 #endif
1586 case DSO_STREAM:
1587 case DSO_SEQPACKET:
1588 case DSO_CONACCEPT:
1589 case DSO_CONREJECT:
1590 return -ENOPROTOOPT;
1591
1592 case DSO_MAXWINDOW:
1593 if (r_len > sizeof(unsigned long))
1594 r_len = sizeof(unsigned long);
1595 r_data = &scp->max_window;
1596 break;
1597
1598 case DSO_NODELAY:
1599 if (r_len > sizeof(int))
1600 r_len = sizeof(int);
1601 val = (scp->nonagle == 1);
1602 r_data = &val;
1603 break;
1604
1605 case DSO_CORK:
1606 if (r_len > sizeof(int))
1607 r_len = sizeof(int);
1608 val = (scp->nonagle == 2);
1609 r_data = &val;
1610 break;
1611
1612 case DSO_SERVICES:
1613 if (r_len > sizeof(unsigned char))
1614 r_len = sizeof(unsigned char);
1615 r_data = &scp->services_rem;
1616 break;
1617
1618 case DSO_INFO:
1619 if (r_len > sizeof(unsigned char))
1620 r_len = sizeof(unsigned char);
1621 r_data = &scp->info_rem;
1622 break;
1623 }
1624
1625 if (r_data) {
1626 if (copy_to_user(optval, r_data, r_len))
1627 return -EFAULT;
1628 if (put_user(r_len, optlen))
1629 return -EFAULT;
1630 }
1631
1632 return 0;
1633 }
1634
1635
1636 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1637 {
1638 struct sk_buff *skb = q->next;
1639 int len = 0;
1640
1641 if (flags & MSG_OOB)
1642 return !skb_queue_empty(q) ? 1 : 0;
1643
1644 while(skb != (struct sk_buff *)q) {
1645 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1646 len += skb->len;
1647
1648 if (cb->nsp_flags & 0x40) {
1649 /* SOCK_SEQPACKET reads to EOM */
1650 if (sk->sk_type == SOCK_SEQPACKET)
1651 return 1;
1652 /* so does SOCK_STREAM unless WAITALL is specified */
1653 if (!(flags & MSG_WAITALL))
1654 return 1;
1655 }
1656
1657 /* minimum data length for read exceeded */
1658 if (len >= target)
1659 return 1;
1660
1661 skb = skb->next;
1662 }
1663
1664 return 0;
1665 }
1666
1667
1668 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1669 struct msghdr *msg, size_t size, int flags)
1670 {
1671 struct sock *sk = sock->sk;
1672 struct dn_scp *scp = DN_SK(sk);
1673 struct sk_buff_head *queue = &sk->sk_receive_queue;
1674 size_t target = size > 1 ? 1 : 0;
1675 size_t copied = 0;
1676 int rv = 0;
1677 struct sk_buff *skb, *nskb;
1678 struct dn_skb_cb *cb = NULL;
1679 unsigned char eor = 0;
1680 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1681
1682 lock_sock(sk);
1683
1684 if (sock_flag(sk, SOCK_ZAPPED)) {
1685 rv = -EADDRNOTAVAIL;
1686 goto out;
1687 }
1688
1689 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1690 rv = 0;
1691 goto out;
1692 }
1693
1694 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1695 if (rv)
1696 goto out;
1697
1698 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1699 rv = -EOPNOTSUPP;
1700 goto out;
1701 }
1702
1703 if (flags & MSG_OOB)
1704 queue = &scp->other_receive_queue;
1705
1706 if (flags & MSG_WAITALL)
1707 target = size;
1708
1709
1710 /*
1711 * See if there is data ready to read, sleep if there isn't
1712 */
1713 for(;;) {
1714 if (sk->sk_err)
1715 goto out;
1716
1717 if (!skb_queue_empty(&scp->other_receive_queue)) {
1718 if (!(flags & MSG_OOB)) {
1719 msg->msg_flags |= MSG_OOB;
1720 if (!scp->other_report) {
1721 scp->other_report = 1;
1722 goto out;
1723 }
1724 }
1725 }
1726
1727 if (scp->state != DN_RUN)
1728 goto out;
1729
1730 if (signal_pending(current)) {
1731 rv = sock_intr_errno(timeo);
1732 goto out;
1733 }
1734
1735 if (dn_data_ready(sk, queue, flags, target))
1736 break;
1737
1738 if (flags & MSG_DONTWAIT) {
1739 rv = -EWOULDBLOCK;
1740 goto out;
1741 }
1742
1743 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1744 SOCK_SLEEP_PRE(sk)
1745
1746 if (!dn_data_ready(sk, queue, flags, target))
1747 schedule();
1748
1749 SOCK_SLEEP_POST(sk)
1750 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1751 }
1752
1753 for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1754 unsigned int chunk = skb->len;
1755 cb = DN_SKB_CB(skb);
1756
1757 if ((chunk + copied) > size)
1758 chunk = size - copied;
1759
1760 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1761 rv = -EFAULT;
1762 break;
1763 }
1764 copied += chunk;
1765
1766 if (!(flags & MSG_PEEK))
1767 skb_pull(skb, chunk);
1768
1769 eor = cb->nsp_flags & 0x40;
1770 nskb = skb->next;
1771
1772 if (skb->len == 0) {
1773 skb_unlink(skb, queue);
1774 kfree_skb(skb);
1775 /*
1776 * N.B. Don't refer to skb or cb after this point
1777 * in loop.
1778 */
1779 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1780 scp->flowloc_sw = DN_SEND;
1781 dn_nsp_send_link(sk, DN_SEND, 0);
1782 }
1783 }
1784
1785 if (eor) {
1786 if (sk->sk_type == SOCK_SEQPACKET)
1787 break;
1788 if (!(flags & MSG_WAITALL))
1789 break;
1790 }
1791
1792 if (flags & MSG_OOB)
1793 break;
1794
1795 if (copied >= target)
1796 break;
1797 }
1798
1799 rv = copied;
1800
1801
1802 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1803 msg->msg_flags |= MSG_EOR;
1804
1805 out:
1806 if (rv == 0)
1807 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1808
1809 if ((rv >= 0) && msg->msg_name) {
1810 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1811 msg->msg_namelen = sizeof(struct sockaddr_dn);
1812 }
1813
1814 release_sock(sk);
1815
1816 return rv;
1817 }
1818
1819
1820 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1821 {
1822 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1823 if (skb_queue_len(queue) >= scp->snd_window)
1824 return 1;
1825 if (fctype != NSP_FC_NONE) {
1826 if (flags & MSG_OOB) {
1827 if (scp->flowrem_oth == 0)
1828 return 1;
1829 } else {
1830 if (scp->flowrem_dat == 0)
1831 return 1;
1832 }
1833 }
1834 return 0;
1835 }
1836
1837 /*
1838 * The DECnet spec requires the the "routing layer" accepts packets which
1839 * are at least 230 bytes in size. This excludes any headers which the NSP
1840 * layer might add, so we always assume that we'll be using the maximal
1841 * length header on data packets. The variation in length is due to the
1842 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1843 * make much practical difference.
1844 */
1845 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1846 {
1847 unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1848 if (dev) {
1849 struct dn_dev *dn_db = dev->dn_ptr;
1850 mtu -= LL_RESERVED_SPACE(dev);
1851 if (dn_db->use_long)
1852 mtu -= 21;
1853 else
1854 mtu -= 6;
1855 mtu -= DN_MAX_NSP_DATA_HEADER;
1856 } else {
1857 /*
1858 * 21 = long header, 16 = guess at MAC header length
1859 */
1860 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1861 }
1862 if (mtu > mss)
1863 mss = mtu;
1864 return mss;
1865 }
1866
1867 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1868 {
1869 struct dst_entry *dst = __sk_dst_get(sk);
1870 struct dn_scp *scp = DN_SK(sk);
1871 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1872
1873 /* Other data messages are limited to 16 bytes per packet */
1874 if (flags & MSG_OOB)
1875 return 16;
1876
1877 /* This works out the maximum size of segment we can send out */
1878 if (dst) {
1879 u32 mtu = dst_mtu(dst);
1880 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1881 }
1882
1883 return mss_now;
1884 }
1885
1886 /*
1887 * N.B. We get the timeout wrong here, but then we always did get it
1888 * wrong before and this is another step along the road to correcting
1889 * it. It ought to get updated each time we pass through the routine,
1890 * but in practise it probably doesn't matter too much for now.
1891 */
1892 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1893 unsigned long datalen, int noblock,
1894 int *errcode)
1895 {
1896 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1897 noblock, errcode);
1898 if (skb) {
1899 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1900 skb->pkt_type = PACKET_OUTGOING;
1901 }
1902 return skb;
1903 }
1904
1905 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1906 struct msghdr *msg, size_t size)
1907 {
1908 struct sock *sk = sock->sk;
1909 struct dn_scp *scp = DN_SK(sk);
1910 size_t mss;
1911 struct sk_buff_head *queue = &scp->data_xmit_queue;
1912 int flags = msg->msg_flags;
1913 int err = 0;
1914 size_t sent = 0;
1915 int addr_len = msg->msg_namelen;
1916 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1917 struct sk_buff *skb = NULL;
1918 struct dn_skb_cb *cb;
1919 size_t len;
1920 unsigned char fctype;
1921 long timeo;
1922
1923 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1924 return -EOPNOTSUPP;
1925
1926 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1927 return -EINVAL;
1928
1929 lock_sock(sk);
1930 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1931 /*
1932 * The only difference between stream sockets and sequenced packet
1933 * sockets is that the stream sockets always behave as if MSG_EOR
1934 * has been set.
1935 */
1936 if (sock->type == SOCK_STREAM) {
1937 if (flags & MSG_EOR) {
1938 err = -EINVAL;
1939 goto out;
1940 }
1941 flags |= MSG_EOR;
1942 }
1943
1944
1945 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1946 if (err)
1947 goto out_err;
1948
1949 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1950 err = -EPIPE;
1951 if (!(flags & MSG_NOSIGNAL))
1952 send_sig(SIGPIPE, current, 0);
1953 goto out_err;
1954 }
1955
1956 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1957 dst_negative_advice(&sk->sk_dst_cache);
1958
1959 mss = scp->segsize_rem;
1960 fctype = scp->services_rem & NSP_FC_MASK;
1961
1962 mss = dn_current_mss(sk, flags);
1963
1964 if (flags & MSG_OOB) {
1965 queue = &scp->other_xmit_queue;
1966 if (size > mss) {
1967 err = -EMSGSIZE;
1968 goto out;
1969 }
1970 }
1971
1972 scp->persist_fxn = dn_nsp_xmit_timeout;
1973
1974 while(sent < size) {
1975 err = sock_error(sk);
1976 if (err)
1977 goto out;
1978
1979 if (signal_pending(current)) {
1980 err = sock_intr_errno(timeo);
1981 goto out;
1982 }
1983
1984 /*
1985 * Calculate size that we wish to send.
1986 */
1987 len = size - sent;
1988
1989 if (len > mss)
1990 len = mss;
1991
1992 /*
1993 * Wait for queue size to go down below the window
1994 * size.
1995 */
1996 if (dn_queue_too_long(scp, queue, flags)) {
1997 if (flags & MSG_DONTWAIT) {
1998 err = -EWOULDBLOCK;
1999 goto out;
2000 }
2001
2002 SOCK_SLEEP_PRE(sk)
2003
2004 if (dn_queue_too_long(scp, queue, flags))
2005 schedule();
2006
2007 SOCK_SLEEP_POST(sk)
2008
2009 continue;
2010 }
2011
2012 /*
2013 * Get a suitably sized skb.
2014 * 64 is a bit of a hack really, but its larger than any
2015 * link-layer headers and has served us well as a good
2016 * guess as to their real length.
2017 */
2018 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2019 flags & MSG_DONTWAIT, &err);
2020
2021 if (err)
2022 break;
2023
2024 if (!skb)
2025 continue;
2026
2027 cb = DN_SKB_CB(skb);
2028
2029 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2030
2031 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2032 err = -EFAULT;
2033 goto out;
2034 }
2035
2036 if (flags & MSG_OOB) {
2037 cb->nsp_flags = 0x30;
2038 if (fctype != NSP_FC_NONE)
2039 scp->flowrem_oth--;
2040 } else {
2041 cb->nsp_flags = 0x00;
2042 if (scp->seg_total == 0)
2043 cb->nsp_flags |= 0x20;
2044
2045 scp->seg_total += len;
2046
2047 if (((sent + len) == size) && (flags & MSG_EOR)) {
2048 cb->nsp_flags |= 0x40;
2049 scp->seg_total = 0;
2050 if (fctype == NSP_FC_SCMC)
2051 scp->flowrem_dat--;
2052 }
2053 if (fctype == NSP_FC_SRC)
2054 scp->flowrem_dat--;
2055 }
2056
2057 sent += len;
2058 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2059 skb = NULL;
2060
2061 scp->persist = dn_nsp_persist(sk);
2062
2063 }
2064 out:
2065
2066 if (skb)
2067 kfree_skb(skb);
2068
2069 release_sock(sk);
2070
2071 return sent ? sent : err;
2072
2073 out_err:
2074 err = sk_stream_error(sk, flags, err);
2075 release_sock(sk);
2076 return err;
2077 }
2078
2079 static int dn_device_event(struct notifier_block *this, unsigned long event,
2080 void *ptr)
2081 {
2082 struct net_device *dev = (struct net_device *)ptr;
2083
2084 switch(event) {
2085 case NETDEV_UP:
2086 dn_dev_up(dev);
2087 break;
2088 case NETDEV_DOWN:
2089 dn_dev_down(dev);
2090 break;
2091 default:
2092 break;
2093 }
2094
2095 return NOTIFY_DONE;
2096 }
2097
2098 static struct notifier_block dn_dev_notifier = {
2099 .notifier_call = dn_device_event,
2100 };
2101
2102 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2103
2104 static struct packet_type dn_dix_packet_type = {
2105 .type = __constant_htons(ETH_P_DNA_RT),
2106 .dev = NULL, /* All devices */
2107 .func = dn_route_rcv,
2108 };
2109
2110 #ifdef CONFIG_PROC_FS
2111 struct dn_iter_state {
2112 int bucket;
2113 };
2114
2115 static struct sock *dn_socket_get_first(struct seq_file *seq)
2116 {
2117 struct dn_iter_state *state = seq->private;
2118 struct sock *n = NULL;
2119
2120 for(state->bucket = 0;
2121 state->bucket < DN_SK_HASH_SIZE;
2122 ++state->bucket) {
2123 n = sk_head(&dn_sk_hash[state->bucket]);
2124 if (n)
2125 break;
2126 }
2127
2128 return n;
2129 }
2130
2131 static struct sock *dn_socket_get_next(struct seq_file *seq,
2132 struct sock *n)
2133 {
2134 struct dn_iter_state *state = seq->private;
2135
2136 n = sk_next(n);
2137 try_again:
2138 if (n)
2139 goto out;
2140 if (++state->bucket >= DN_SK_HASH_SIZE)
2141 goto out;
2142 n = sk_head(&dn_sk_hash[state->bucket]);
2143 goto try_again;
2144 out:
2145 return n;
2146 }
2147
2148 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2149 {
2150 struct sock *sk = dn_socket_get_first(seq);
2151
2152 if (sk) {
2153 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2154 --*pos;
2155 }
2156 return *pos ? NULL : sk;
2157 }
2158
2159 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2160 {
2161 void *rc;
2162 read_lock_bh(&dn_hash_lock);
2163 rc = socket_get_idx(seq, &pos);
2164 if (!rc) {
2165 read_unlock_bh(&dn_hash_lock);
2166 }
2167 return rc;
2168 }
2169
2170 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2171 {
2172 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2173 }
2174
2175 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2176 {
2177 void *rc;
2178
2179 if (v == SEQ_START_TOKEN) {
2180 rc = dn_socket_get_idx(seq, 0);
2181 goto out;
2182 }
2183
2184 rc = dn_socket_get_next(seq, v);
2185 if (rc)
2186 goto out;
2187 read_unlock_bh(&dn_hash_lock);
2188 out:
2189 ++*pos;
2190 return rc;
2191 }
2192
2193 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2194 {
2195 if (v && v != SEQ_START_TOKEN)
2196 read_unlock_bh(&dn_hash_lock);
2197 }
2198
2199 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2200
2201 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2202 {
2203 int i;
2204
2205 switch (dn_ntohs(dn->sdn_objnamel)) {
2206 case 0:
2207 sprintf(buf, "%d", dn->sdn_objnum);
2208 break;
2209 default:
2210 for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2211 buf[i] = dn->sdn_objname[i];
2212 if (IS_NOT_PRINTABLE(buf[i]))
2213 buf[i] = '.';
2214 }
2215 buf[i] = 0;
2216 }
2217 }
2218
2219 static char *dn_state2asc(unsigned char state)
2220 {
2221 switch(state) {
2222 case DN_O:
2223 return "OPEN";
2224 case DN_CR:
2225 return " CR";
2226 case DN_DR:
2227 return " DR";
2228 case DN_DRC:
2229 return " DRC";
2230 case DN_CC:
2231 return " CC";
2232 case DN_CI:
2233 return " CI";
2234 case DN_NR:
2235 return " NR";
2236 case DN_NC:
2237 return " NC";
2238 case DN_CD:
2239 return " CD";
2240 case DN_RJ:
2241 return " RJ";
2242 case DN_RUN:
2243 return " RUN";
2244 case DN_DI:
2245 return " DI";
2246 case DN_DIC:
2247 return " DIC";
2248 case DN_DN:
2249 return " DN";
2250 case DN_CL:
2251 return " CL";
2252 case DN_CN:
2253 return " CN";
2254 }
2255
2256 return "????";
2257 }
2258
2259 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2260 {
2261 struct dn_scp *scp = DN_SK(sk);
2262 char buf1[DN_ASCBUF_LEN];
2263 char buf2[DN_ASCBUF_LEN];
2264 char local_object[DN_MAXOBJL+3];
2265 char remote_object[DN_MAXOBJL+3];
2266
2267 dn_printable_object(&scp->addr, local_object);
2268 dn_printable_object(&scp->peer, remote_object);
2269
2270 seq_printf(seq,
2271 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2272 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2273 dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2274 scp->addrloc,
2275 scp->numdat,
2276 scp->numoth,
2277 scp->ackxmt_dat,
2278 scp->ackxmt_oth,
2279 scp->flowloc_sw,
2280 local_object,
2281 dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2282 scp->addrrem,
2283 scp->numdat_rcv,
2284 scp->numoth_rcv,
2285 scp->ackrcv_dat,
2286 scp->ackrcv_oth,
2287 scp->flowrem_sw,
2288 remote_object,
2289 dn_state2asc(scp->state),
2290 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2291 }
2292
2293 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2294 {
2295 if (v == SEQ_START_TOKEN) {
2296 seq_puts(seq, "Local Remote\n");
2297 } else {
2298 dn_socket_format_entry(seq, v);
2299 }
2300 return 0;
2301 }
2302
2303 static struct seq_operations dn_socket_seq_ops = {
2304 .start = dn_socket_seq_start,
2305 .next = dn_socket_seq_next,
2306 .stop = dn_socket_seq_stop,
2307 .show = dn_socket_seq_show,
2308 };
2309
2310 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2311 {
2312 struct seq_file *seq;
2313 int rc = -ENOMEM;
2314 struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2315
2316 if (!s)
2317 goto out;
2318
2319 rc = seq_open(file, &dn_socket_seq_ops);
2320 if (rc)
2321 goto out_kfree;
2322
2323 seq = file->private_data;
2324 seq->private = s;
2325 memset(s, 0, sizeof(*s));
2326 out:
2327 return rc;
2328 out_kfree:
2329 kfree(s);
2330 goto out;
2331 }
2332
2333 static struct file_operations dn_socket_seq_fops = {
2334 .owner = THIS_MODULE,
2335 .open = dn_socket_seq_open,
2336 .read = seq_read,
2337 .llseek = seq_lseek,
2338 .release = seq_release_private,
2339 };
2340 #endif
2341
2342 static struct net_proto_family dn_family_ops = {
2343 .family = AF_DECnet,
2344 .create = dn_create,
2345 .owner = THIS_MODULE,
2346 };
2347
2348 static const struct proto_ops dn_proto_ops = {
2349 .family = AF_DECnet,
2350 .owner = THIS_MODULE,
2351 .release = dn_release,
2352 .bind = dn_bind,
2353 .connect = dn_connect,
2354 .socketpair = sock_no_socketpair,
2355 .accept = dn_accept,
2356 .getname = dn_getname,
2357 .poll = dn_poll,
2358 .ioctl = dn_ioctl,
2359 .listen = dn_listen,
2360 .shutdown = dn_shutdown,
2361 .setsockopt = dn_setsockopt,
2362 .getsockopt = dn_getsockopt,
2363 .sendmsg = dn_sendmsg,
2364 .recvmsg = dn_recvmsg,
2365 .mmap = sock_no_mmap,
2366 .sendpage = sock_no_sendpage,
2367 };
2368
2369 void dn_register_sysctl(void);
2370 void dn_unregister_sysctl(void);
2371
2372 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2373 MODULE_AUTHOR("Linux DECnet Project Team");
2374 MODULE_LICENSE("GPL");
2375 MODULE_ALIAS_NETPROTO(PF_DECnet);
2376
2377 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2378
2379 static int __init decnet_init(void)
2380 {
2381 int rc;
2382
2383 printk(banner);
2384
2385 rc = proto_register(&dn_proto, 1);
2386 if (rc != 0)
2387 goto out;
2388
2389 dn_neigh_init();
2390 dn_dev_init();
2391 dn_route_init();
2392 dn_fib_init();
2393
2394 sock_register(&dn_family_ops);
2395 dev_add_pack(&dn_dix_packet_type);
2396 register_netdevice_notifier(&dn_dev_notifier);
2397
2398 proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2399 dn_register_sysctl();
2400 out:
2401 return rc;
2402
2403 }
2404 module_init(decnet_init);
2405
2406 /*
2407 * Prevent DECnet module unloading until its fixed properly.
2408 * Requires an audit of the code to check for memory leaks and
2409 * initialisation problems etc.
2410 */
2411 #if 0
2412 static void __exit decnet_exit(void)
2413 {
2414 sock_unregister(AF_DECnet);
2415 dev_remove_pack(&dn_dix_packet_type);
2416
2417 dn_unregister_sysctl();
2418
2419 unregister_netdevice_notifier(&dn_dev_notifier);
2420
2421 dn_route_cleanup();
2422 dn_dev_cleanup();
2423 dn_neigh_cleanup();
2424 dn_fib_cleanup();
2425
2426 proc_net_remove("decnet");
2427
2428 proto_unregister(&dn_proto);
2429 }
2430 module_exit(decnet_exit);
2431 #endif
Linux with added FPC-III support