blob: 3f25cadccddd4f048cdbf36d2fa5e92a8a176116 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
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
59HISTORY:
60
61Version Kernel Date Author/Comments
62------- ------ ---- ---------------
63Version 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
70Version 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
75Version 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
83Version 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 -
89Version 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 -
95Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
96 dn_recvmsg fixes
97
98 Patrick J. Caulfield
99 dn_bind fixes
100*******************************************************************************/
101
102#include <linux/config.h>
103#include <linux/module.h>
104#include <linux/errno.h>
105#include <linux/types.h>
106#include <linux/slab.h>
107#include <linux/socket.h>
108#include <linux/in.h>
109#include <linux/kernel.h>
110#include <linux/sched.h>
111#include <linux/timer.h>
112#include <linux/string.h>
113#include <linux/sockios.h>
114#include <linux/net.h>
115#include <linux/netdevice.h>
116#include <linux/inet.h>
117#include <linux/route.h>
118#include <linux/netfilter.h>
119#include <linux/seq_file.h>
120#include <net/sock.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -0700121#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122#include <net/flow.h>
123#include <asm/system.h>
124#include <asm/ioctls.h>
125#include <linux/mm.h>
126#include <linux/interrupt.h>
127#include <linux/proc_fs.h>
128#include <linux/stat.h>
129#include <linux/init.h>
130#include <linux/poll.h>
131#include <net/neighbour.h>
132#include <net/dst.h>
133#include <net/dn.h>
134#include <net/dn_nsp.h>
135#include <net/dn_dev.h>
136#include <net/dn_route.h>
137#include <net/dn_fib.h>
138#include <net/dn_neigh.h>
139
140struct dn_sock {
141 struct sock sk;
142 struct dn_scp scp;
143};
144
145static void dn_keepalive(struct sock *sk);
146
147#define DN_SK_HASH_SHIFT 8
148#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
149#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
150
151
152static struct proto_ops dn_proto_ops;
153static DEFINE_RWLOCK(dn_hash_lock);
154static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
155static struct hlist_head dn_wild_sk;
156
157static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
158static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
159
160static struct hlist_head *dn_find_list(struct sock *sk)
161{
162 struct dn_scp *scp = DN_SK(sk);
163
164 if (scp->addr.sdn_flags & SDF_WILD)
165 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
166
167 return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK];
168}
169
170/*
171 * Valid ports are those greater than zero and not already in use.
172 */
173static int check_port(unsigned short port)
174{
175 struct sock *sk;
176 struct hlist_node *node;
177
178 if (port == 0)
179 return -1;
180
181 sk_for_each(sk, node, &dn_sk_hash[port & DN_SK_HASH_MASK]) {
182 struct dn_scp *scp = DN_SK(sk);
183 if (scp->addrloc == port)
184 return -1;
185 }
186 return 0;
187}
188
189static unsigned short port_alloc(struct sock *sk)
190{
191 struct dn_scp *scp = DN_SK(sk);
192static unsigned short port = 0x2000;
193 unsigned short i_port = port;
194
195 while(check_port(++port) != 0) {
196 if (port == i_port)
197 return 0;
198 }
199
200 scp->addrloc = port;
201
202 return 1;
203}
204
205/*
206 * Since this is only ever called from user
207 * level, we don't need a write_lock() version
208 * of this.
209 */
210static int dn_hash_sock(struct sock *sk)
211{
212 struct dn_scp *scp = DN_SK(sk);
213 struct hlist_head *list;
214 int rv = -EUSERS;
215
216 BUG_ON(sk_hashed(sk));
217
218 write_lock_bh(&dn_hash_lock);
219
220 if (!scp->addrloc && !port_alloc(sk))
221 goto out;
222
223 rv = -EADDRINUSE;
224 if ((list = dn_find_list(sk)) == NULL)
225 goto out;
226
227 sk_add_node(sk, list);
228 rv = 0;
229out:
230 write_unlock_bh(&dn_hash_lock);
231 return rv;
232}
233
234static void dn_unhash_sock(struct sock *sk)
235{
236 write_lock(&dn_hash_lock);
237 sk_del_node_init(sk);
238 write_unlock(&dn_hash_lock);
239}
240
241static void dn_unhash_sock_bh(struct sock *sk)
242{
243 write_lock_bh(&dn_hash_lock);
244 sk_del_node_init(sk);
245 write_unlock_bh(&dn_hash_lock);
246}
247
248static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
249{
250 int i;
251 unsigned hash = addr->sdn_objnum;
252
253 if (hash == 0) {
254 hash = addr->sdn_objnamel;
255 for(i = 0; i < dn_ntohs(addr->sdn_objnamel); i++) {
256 hash ^= addr->sdn_objname[i];
257 hash ^= (hash << 3);
258 }
259 }
260
261 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
262}
263
264/*
265 * Called to transform a socket from bound (i.e. with a local address)
266 * into a listening socket (doesn't need a local port number) and rehashes
267 * based upon the object name/number.
268 */
269static void dn_rehash_sock(struct sock *sk)
270{
271 struct hlist_head *list;
272 struct dn_scp *scp = DN_SK(sk);
273
274 if (scp->addr.sdn_flags & SDF_WILD)
275 return;
276
277 write_lock_bh(&dn_hash_lock);
278 sk_del_node_init(sk);
279 DN_SK(sk)->addrloc = 0;
280 list = listen_hash(&DN_SK(sk)->addr);
281 sk_add_node(sk, list);
282 write_unlock_bh(&dn_hash_lock);
283}
284
285int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
286{
287 int len = 2;
288
289 *buf++ = type;
290
291 switch(type) {
292 case 0:
293 *buf++ = sdn->sdn_objnum;
294 break;
295 case 1:
296 *buf++ = 0;
297 *buf++ = dn_ntohs(sdn->sdn_objnamel);
298 memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
299 len = 3 + dn_ntohs(sdn->sdn_objnamel);
300 break;
301 case 2:
302 memset(buf, 0, 5);
303 buf += 5;
304 *buf++ = dn_ntohs(sdn->sdn_objnamel);
305 memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
306 len = 7 + dn_ntohs(sdn->sdn_objnamel);
307 break;
308 }
309
310 return len;
311}
312
313/*
314 * On reception of usernames, we handle types 1 and 0 for destination
315 * addresses only. Types 2 and 4 are used for source addresses, but the
316 * UIC, GIC are ignored and they are both treated the same way. Type 3
317 * is never used as I've no idea what its purpose might be or what its
318 * format is.
319 */
320int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
321{
322 unsigned char type;
323 int size = len;
324 int namel = 12;
325
326 sdn->sdn_objnum = 0;
327 sdn->sdn_objnamel = dn_htons(0);
328 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
329
330 if (len < 2)
331 return -1;
332
333 len -= 2;
334 *fmt = *data++;
335 type = *data++;
336
337 switch(*fmt) {
338 case 0:
339 sdn->sdn_objnum = type;
340 return 2;
341 case 1:
342 namel = 16;
343 break;
344 case 2:
345 len -= 4;
346 data += 4;
347 break;
348 case 4:
349 len -= 8;
350 data += 8;
351 break;
352 default:
353 return -1;
354 }
355
356 len -= 1;
357
358 if (len < 0)
359 return -1;
360
361 sdn->sdn_objnamel = dn_htons(*data++);
362 len -= dn_ntohs(sdn->sdn_objnamel);
363
364 if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
365 return -1;
366
367 memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel));
368
369 return size - len;
370}
371
372struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
373{
374 struct hlist_head *list = listen_hash(addr);
375 struct hlist_node *node;
376 struct sock *sk;
377
378 read_lock(&dn_hash_lock);
379 sk_for_each(sk, node, list) {
380 struct dn_scp *scp = DN_SK(sk);
381 if (sk->sk_state != TCP_LISTEN)
382 continue;
383 if (scp->addr.sdn_objnum) {
384 if (scp->addr.sdn_objnum != addr->sdn_objnum)
385 continue;
386 } else {
387 if (addr->sdn_objnum)
388 continue;
389 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
390 continue;
391 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
392 continue;
393 }
394 sock_hold(sk);
395 read_unlock(&dn_hash_lock);
396 return sk;
397 }
398
399 sk = sk_head(&dn_wild_sk);
400 if (sk) {
401 if (sk->sk_state == TCP_LISTEN)
402 sock_hold(sk);
403 else
404 sk = NULL;
405 }
406
407 read_unlock(&dn_hash_lock);
408 return sk;
409}
410
411struct sock *dn_find_by_skb(struct sk_buff *skb)
412{
413 struct dn_skb_cb *cb = DN_SKB_CB(skb);
414 struct sock *sk;
415 struct hlist_node *node;
416 struct dn_scp *scp;
417
418 read_lock(&dn_hash_lock);
419 sk_for_each(sk, node, &dn_sk_hash[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;
431found:
432 read_unlock(&dn_hash_lock);
433 return sk;
434}
435
436
437
438static 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(xchg(&sk->sk_dst_cache, NULL));
447}
448
449static struct proto dn_proto = {
450 .name = "DECNET",
451 .owner = THIS_MODULE,
452 .obj_size = sizeof(struct dn_sock),
453};
454
Al Virodd0fc662005-10-07 07:46:04 +0100455static struct sock *dn_alloc_sock(struct socket *sock, gfp_t gfp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
457 struct dn_scp *scp;
458 struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
459
460 if (!sk)
461 goto out;
462
463 if (sock)
464 sock->ops = &dn_proto_ops;
465 sock_init_data(sock, sk);
466
467 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
468 sk->sk_destruct = dn_destruct;
469 sk->sk_no_check = 1;
470 sk->sk_family = PF_DECnet;
471 sk->sk_protocol = 0;
472 sk->sk_allocation = gfp;
473
474 /* Initialization of DECnet Session Control Port */
475 scp = DN_SK(sk);
476 scp->state = DN_O; /* Open */
477 scp->numdat = 1; /* Next data seg to tx */
478 scp->numoth = 1; /* Next oth data to tx */
479 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
480 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
481 scp->ackrcv_dat = 0; /* Highest data ack recv*/
482 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
483 scp->flowrem_sw = DN_SEND;
484 scp->flowloc_sw = DN_SEND;
485 scp->flowrem_dat = 0;
486 scp->flowrem_oth = 1;
487 scp->flowloc_dat = 0;
488 scp->flowloc_oth = 1;
489 scp->services_rem = 0;
490 scp->services_loc = 1 | NSP_FC_NONE;
491 scp->info_rem = 0;
492 scp->info_loc = 0x03; /* NSP version 4.1 */
493 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
494 scp->nonagle = 0;
495 scp->multi_ireq = 1;
496 scp->accept_mode = ACC_IMMED;
497 scp->addr.sdn_family = AF_DECnet;
498 scp->peer.sdn_family = AF_DECnet;
499 scp->accessdata.acc_accl = 5;
500 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
501
502 scp->max_window = NSP_MAX_WINDOW;
503 scp->snd_window = NSP_MIN_WINDOW;
504 scp->nsp_srtt = NSP_INITIAL_SRTT;
505 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
506 scp->nsp_rxtshift = 0;
507
508 skb_queue_head_init(&scp->data_xmit_queue);
509 skb_queue_head_init(&scp->other_xmit_queue);
510 skb_queue_head_init(&scp->other_receive_queue);
511
512 scp->persist = 0;
513 scp->persist_fxn = NULL;
514 scp->keepalive = 10 * HZ;
515 scp->keepalive_fxn = dn_keepalive;
516
517 init_timer(&scp->delack_timer);
518 scp->delack_pending = 0;
519 scp->delack_fxn = dn_nsp_delayed_ack;
520
521 dn_start_slow_timer(sk);
522out:
523 return sk;
524}
525
526/*
527 * Keepalive timer.
528 * FIXME: Should respond to SO_KEEPALIVE etc.
529 */
530static void dn_keepalive(struct sock *sk)
531{
532 struct dn_scp *scp = DN_SK(sk);
533
534 /*
535 * By checking the other_data transmit queue is empty
536 * we are double checking that we are not sending too
537 * many of these keepalive frames.
538 */
David S. Millerb03efcf2005-07-08 14:57:23 -0700539 if (skb_queue_empty(&scp->other_xmit_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
541}
542
543
544/*
545 * Timer for shutdown/destroyed sockets.
546 * When socket is dead & no packets have been sent for a
547 * certain amount of time, they are removed by this
548 * routine. Also takes care of sending out DI & DC
549 * frames at correct times.
550 */
551int dn_destroy_timer(struct sock *sk)
552{
553 struct dn_scp *scp = DN_SK(sk);
554
555 scp->persist = dn_nsp_persist(sk);
556
557 switch(scp->state) {
558 case DN_DI:
559 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
560 if (scp->nsp_rxtshift >= decnet_di_count)
561 scp->state = DN_CN;
562 return 0;
563
564 case DN_DR:
565 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
566 if (scp->nsp_rxtshift >= decnet_dr_count)
567 scp->state = DN_DRC;
568 return 0;
569
570 case DN_DN:
571 if (scp->nsp_rxtshift < decnet_dn_count) {
572 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
573 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
574 return 0;
575 }
576 }
577
578 scp->persist = (HZ * decnet_time_wait);
579
580 if (sk->sk_socket)
581 return 0;
582
583 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
584 dn_unhash_sock(sk);
585 sock_put(sk);
586 return 1;
587 }
588
589 return 0;
590}
591
592static void dn_destroy_sock(struct sock *sk)
593{
594 struct dn_scp *scp = DN_SK(sk);
595
596 scp->nsp_rxtshift = 0; /* reset back off */
597
598 if (sk->sk_socket) {
599 if (sk->sk_socket->state != SS_UNCONNECTED)
600 sk->sk_socket->state = SS_DISCONNECTING;
601 }
602
603 sk->sk_state = TCP_CLOSE;
604
605 switch(scp->state) {
606 case DN_DN:
607 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
608 sk->sk_allocation);
609 scp->persist_fxn = dn_destroy_timer;
610 scp->persist = dn_nsp_persist(sk);
611 break;
612 case DN_CR:
613 scp->state = DN_DR;
614 goto disc_reject;
615 case DN_RUN:
616 scp->state = DN_DI;
617 case DN_DI:
618 case DN_DR:
619disc_reject:
620 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
621 case DN_NC:
622 case DN_NR:
623 case DN_RJ:
624 case DN_DIC:
625 case DN_CN:
626 case DN_DRC:
627 case DN_CI:
628 case DN_CD:
629 scp->persist_fxn = dn_destroy_timer;
630 scp->persist = dn_nsp_persist(sk);
631 break;
632 default:
633 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
634 case DN_O:
635 dn_stop_slow_timer(sk);
636
637 dn_unhash_sock_bh(sk);
638 sock_put(sk);
639
640 break;
641 }
642}
643
644char *dn_addr2asc(dn_address addr, char *buf)
645{
646 unsigned short node, area;
647
648 node = addr & 0x03ff;
649 area = addr >> 10;
650 sprintf(buf, "%hd.%hd", area, node);
651
652 return buf;
653}
654
655
656
657static int dn_create(struct socket *sock, int protocol)
658{
659 struct sock *sk;
660
661 switch(sock->type) {
662 case SOCK_SEQPACKET:
663 if (protocol != DNPROTO_NSP)
664 return -EPROTONOSUPPORT;
665 break;
666 case SOCK_STREAM:
667 break;
668 default:
669 return -ESOCKTNOSUPPORT;
670 }
671
672
673 if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
674 return -ENOBUFS;
675
676 sk->sk_protocol = protocol;
677
678 return 0;
679}
680
681
682static int
683dn_release(struct socket *sock)
684{
685 struct sock *sk = sock->sk;
686
687 if (sk) {
688 sock_orphan(sk);
689 sock_hold(sk);
690 lock_sock(sk);
691 dn_destroy_sock(sk);
692 release_sock(sk);
693 sock_put(sk);
694 }
695
696 return 0;
697}
698
699static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
700{
701 struct sock *sk = sock->sk;
702 struct dn_scp *scp = DN_SK(sk);
703 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
704 struct net_device *dev;
705 int rv;
706
707 if (addr_len != sizeof(struct sockaddr_dn))
708 return -EINVAL;
709
710 if (saddr->sdn_family != AF_DECnet)
711 return -EINVAL;
712
713 if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
714 return -EINVAL;
715
716 if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
717 return -EINVAL;
718
719 if (saddr->sdn_flags & ~SDF_WILD)
720 return -EINVAL;
721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
723 (saddr->sdn_flags & SDF_WILD)))
724 return -EACCES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 if (!(saddr->sdn_flags & SDF_WILD)) {
727 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
728 read_lock(&dev_base_lock);
729 for(dev = dev_base; dev; dev = dev->next) {
730 if (!dev->dn_ptr)
731 continue;
732 if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
733 break;
734 }
735 read_unlock(&dev_base_lock);
736 if (dev == NULL)
737 return -EADDRNOTAVAIL;
738 }
739 }
740
741 rv = -EINVAL;
742 lock_sock(sk);
743 if (sock_flag(sk, SOCK_ZAPPED)) {
744 memcpy(&scp->addr, saddr, addr_len);
745 sock_reset_flag(sk, SOCK_ZAPPED);
746
747 rv = dn_hash_sock(sk);
748 if (rv)
749 sock_set_flag(sk, SOCK_ZAPPED);
750 }
751 release_sock(sk);
752
753 return rv;
754}
755
756
757static int dn_auto_bind(struct socket *sock)
758{
759 struct sock *sk = sock->sk;
760 struct dn_scp *scp = DN_SK(sk);
761 int rv;
762
763 sock_reset_flag(sk, SOCK_ZAPPED);
764
765 scp->addr.sdn_flags = 0;
766 scp->addr.sdn_objnum = 0;
767
768 /*
769 * This stuff is to keep compatibility with Eduardo's
770 * patch. I hope I can dispense with it shortly...
771 */
772 if ((scp->accessdata.acc_accl != 0) &&
773 (scp->accessdata.acc_accl <= 12)) {
774
775 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
776 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
777
778 scp->accessdata.acc_accl = 0;
779 memset(scp->accessdata.acc_acc, 0, 40);
780 }
781 /* End of compatibility stuff */
782
783 scp->addr.sdn_add.a_len = dn_htons(2);
784 rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr);
785 if (rv == 0) {
786 rv = dn_hash_sock(sk);
787 if (rv)
788 sock_set_flag(sk, SOCK_ZAPPED);
789 }
790
791 return rv;
792}
793
Al Virodd0fc662005-10-07 07:46:04 +0100794static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795{
796 struct dn_scp *scp = DN_SK(sk);
797 DEFINE_WAIT(wait);
798 int err;
799
800 if (scp->state != DN_CR)
801 return -EINVAL;
802
803 scp->state = DN_CC;
804 scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
805 dn_send_conn_conf(sk, allocation);
806
807 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
808 for(;;) {
809 release_sock(sk);
810 if (scp->state == DN_CC)
811 *timeo = schedule_timeout(*timeo);
812 lock_sock(sk);
813 err = 0;
814 if (scp->state == DN_RUN)
815 break;
816 err = sock_error(sk);
817 if (err)
818 break;
819 err = sock_intr_errno(*timeo);
820 if (signal_pending(current))
821 break;
822 err = -EAGAIN;
823 if (!*timeo)
824 break;
825 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
826 }
827 finish_wait(sk->sk_sleep, &wait);
828 if (err == 0) {
829 sk->sk_socket->state = SS_CONNECTED;
830 } else if (scp->state != DN_CC) {
831 sk->sk_socket->state = SS_UNCONNECTED;
832 }
833 return err;
834}
835
836static int dn_wait_run(struct sock *sk, long *timeo)
837{
838 struct dn_scp *scp = DN_SK(sk);
839 DEFINE_WAIT(wait);
840 int err = 0;
841
842 if (scp->state == DN_RUN)
843 goto out;
844
845 if (!*timeo)
846 return -EALREADY;
847
848 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
849 for(;;) {
850 release_sock(sk);
851 if (scp->state == DN_CI || scp->state == DN_CC)
852 *timeo = schedule_timeout(*timeo);
853 lock_sock(sk);
854 err = 0;
855 if (scp->state == DN_RUN)
856 break;
857 err = sock_error(sk);
858 if (err)
859 break;
860 err = sock_intr_errno(*timeo);
861 if (signal_pending(current))
862 break;
863 err = -ETIMEDOUT;
864 if (!*timeo)
865 break;
866 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
867 }
868 finish_wait(sk->sk_sleep, &wait);
869out:
870 if (err == 0) {
871 sk->sk_socket->state = SS_CONNECTED;
872 } else if (scp->state != DN_CI && scp->state != DN_CC) {
873 sk->sk_socket->state = SS_UNCONNECTED;
874 }
875 return err;
876}
877
878static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
879{
880 struct socket *sock = sk->sk_socket;
881 struct dn_scp *scp = DN_SK(sk);
882 int err = -EISCONN;
883 struct flowi fl;
884
885 if (sock->state == SS_CONNECTED)
886 goto out;
887
888 if (sock->state == SS_CONNECTING) {
889 err = 0;
890 if (scp->state == DN_RUN) {
891 sock->state = SS_CONNECTED;
892 goto out;
893 }
894 err = -ECONNREFUSED;
895 if (scp->state != DN_CI && scp->state != DN_CC) {
896 sock->state = SS_UNCONNECTED;
897 goto out;
898 }
899 return dn_wait_run(sk, timeo);
900 }
901
902 err = -EINVAL;
903 if (scp->state != DN_O)
904 goto out;
905
906 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
907 goto out;
908 if (addr->sdn_family != AF_DECnet)
909 goto out;
910 if (addr->sdn_flags & SDF_WILD)
911 goto out;
912
913 if (sock_flag(sk, SOCK_ZAPPED)) {
914 err = dn_auto_bind(sk->sk_socket);
915 if (err)
916 goto out;
917 }
918
919 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
920
921 err = -EHOSTUNREACH;
922 memset(&fl, 0, sizeof(fl));
923 fl.oif = sk->sk_bound_dev_if;
924 fl.fld_dst = dn_saddr2dn(&scp->peer);
925 fl.fld_src = dn_saddr2dn(&scp->addr);
926 dn_sk_ports_copy(&fl, scp);
927 fl.proto = DNPROTO_NSP;
928 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
929 goto out;
930 sk->sk_route_caps = sk->sk_dst_cache->dev->features;
931 sock->state = SS_CONNECTING;
932 scp->state = DN_CI;
933 scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
934
935 dn_nsp_send_conninit(sk, NSP_CI);
936 err = -EINPROGRESS;
937 if (*timeo) {
938 err = dn_wait_run(sk, timeo);
939 }
940out:
941 return err;
942}
943
944static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
945{
946 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
947 struct sock *sk = sock->sk;
948 int err;
949 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
950
951 lock_sock(sk);
952 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
953 release_sock(sk);
954
955 return err;
956}
957
958static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
959{
960 struct dn_scp *scp = DN_SK(sk);
961
962 switch(scp->state) {
963 case DN_RUN:
964 return 0;
965 case DN_CR:
966 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
967 case DN_CI:
968 case DN_CC:
969 return dn_wait_run(sk, timeo);
970 case DN_O:
971 return __dn_connect(sk, addr, addrlen, timeo, flags);
972 }
973
974 return -EINVAL;
975}
976
977
978static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
979{
980 unsigned char *ptr = skb->data;
981
982 acc->acc_userl = *ptr++;
983 memcpy(&acc->acc_user, ptr, acc->acc_userl);
984 ptr += acc->acc_userl;
985
986 acc->acc_passl = *ptr++;
987 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
988 ptr += acc->acc_passl;
989
990 acc->acc_accl = *ptr++;
991 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
992
993 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
994
995}
996
997static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
998{
999 unsigned char *ptr = skb->data;
1000
1001 opt->opt_optl = *ptr++;
1002 opt->opt_status = 0;
1003 memcpy(opt->opt_data, ptr, opt->opt_optl);
1004 skb_pull(skb, opt->opt_optl + 1);
1005
1006}
1007
1008static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1009{
1010 DEFINE_WAIT(wait);
1011 struct sk_buff *skb = NULL;
1012 int err = 0;
1013
1014 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1015 for(;;) {
1016 release_sock(sk);
1017 skb = skb_dequeue(&sk->sk_receive_queue);
1018 if (skb == NULL) {
1019 *timeo = schedule_timeout(*timeo);
1020 skb = skb_dequeue(&sk->sk_receive_queue);
1021 }
1022 lock_sock(sk);
1023 if (skb != NULL)
1024 break;
1025 err = -EINVAL;
1026 if (sk->sk_state != TCP_LISTEN)
1027 break;
1028 err = sock_intr_errno(*timeo);
1029 if (signal_pending(current))
1030 break;
1031 err = -EAGAIN;
1032 if (!*timeo)
1033 break;
1034 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1035 }
1036 finish_wait(sk->sk_sleep, &wait);
1037
1038 return skb == NULL ? ERR_PTR(err) : skb;
1039}
1040
1041static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1042{
1043 struct sock *sk = sock->sk, *newsk;
1044 struct sk_buff *skb = NULL;
1045 struct dn_skb_cb *cb;
1046 unsigned char menuver;
1047 int err = 0;
1048 unsigned char type;
1049 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1050
1051 lock_sock(sk);
1052
1053 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1054 release_sock(sk);
1055 return -EINVAL;
1056 }
1057
1058 skb = skb_dequeue(&sk->sk_receive_queue);
1059 if (skb == NULL) {
1060 skb = dn_wait_for_connect(sk, &timeo);
1061 if (IS_ERR(skb)) {
1062 release_sock(sk);
1063 return PTR_ERR(skb);
1064 }
1065 }
1066
1067 cb = DN_SKB_CB(skb);
1068 sk->sk_ack_backlog--;
1069 newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1070 if (newsk == NULL) {
1071 release_sock(sk);
1072 kfree_skb(skb);
1073 return -ENOBUFS;
1074 }
1075 release_sock(sk);
1076
1077 dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1078 skb->dst = NULL;
1079
1080 DN_SK(newsk)->state = DN_CR;
1081 DN_SK(newsk)->addrrem = cb->src_port;
1082 DN_SK(newsk)->services_rem = cb->services;
1083 DN_SK(newsk)->info_rem = cb->info;
1084 DN_SK(newsk)->segsize_rem = cb->segsize;
1085 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1086
1087 if (DN_SK(newsk)->segsize_rem < 230)
1088 DN_SK(newsk)->segsize_rem = 230;
1089
1090 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1091 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1092
1093 newsk->sk_state = TCP_LISTEN;
1094 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1095
1096 /*
1097 * If we are listening on a wild socket, we don't want
1098 * the newly created socket on the wrong hash queue.
1099 */
1100 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1101
1102 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1103 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1104 *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1105 *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1106
1107 menuver = *skb->data;
1108 skb_pull(skb, 1);
1109
1110 if (menuver & DN_MENUVER_ACC)
1111 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1112
1113 if (menuver & DN_MENUVER_USR)
1114 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1115
1116 if (menuver & DN_MENUVER_PRX)
1117 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1118
1119 if (menuver & DN_MENUVER_UIC)
1120 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1121
1122 kfree_skb(skb);
1123
1124 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1125 sizeof(struct optdata_dn));
1126 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1127 sizeof(struct optdata_dn));
1128
1129 lock_sock(newsk);
1130 err = dn_hash_sock(newsk);
1131 if (err == 0) {
1132 sock_reset_flag(newsk, SOCK_ZAPPED);
1133 dn_send_conn_ack(newsk);
1134
1135 /*
1136 * Here we use sk->sk_allocation since although the conn conf is
1137 * for the newsk, the context is the old socket.
1138 */
1139 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1140 err = dn_confirm_accept(newsk, &timeo,
1141 sk->sk_allocation);
1142 }
1143 release_sock(newsk);
1144 return err;
1145}
1146
1147
1148static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1149{
1150 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1151 struct sock *sk = sock->sk;
1152 struct dn_scp *scp = DN_SK(sk);
1153
1154 *uaddr_len = sizeof(struct sockaddr_dn);
1155
1156 lock_sock(sk);
1157
1158 if (peer) {
1159 if ((sock->state != SS_CONNECTED &&
1160 sock->state != SS_CONNECTING) &&
1161 scp->accept_mode == ACC_IMMED)
1162 return -ENOTCONN;
1163
1164 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1165 } else {
1166 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1167 }
1168
1169 release_sock(sk);
1170
1171 return 0;
1172}
1173
1174
1175static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1176{
1177 struct sock *sk = sock->sk;
1178 struct dn_scp *scp = DN_SK(sk);
1179 int mask = datagram_poll(file, sock, wait);
1180
David S. Millerb03efcf2005-07-08 14:57:23 -07001181 if (!skb_queue_empty(&scp->other_receive_queue))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 mask |= POLLRDBAND;
1183
1184 return mask;
1185}
1186
1187static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1188{
1189 struct sock *sk = sock->sk;
1190 struct dn_scp *scp = DN_SK(sk);
1191 int err = -EOPNOTSUPP;
1192 long amount = 0;
1193 struct sk_buff *skb;
1194 int val;
1195
1196 switch(cmd)
1197 {
1198 case SIOCGIFADDR:
1199 case SIOCSIFADDR:
1200 return dn_dev_ioctl(cmd, (void __user *)arg);
1201
1202 case SIOCATMARK:
1203 lock_sock(sk);
David S. Millerb03efcf2005-07-08 14:57:23 -07001204 val = !skb_queue_empty(&scp->other_receive_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 if (scp->state != DN_RUN)
1206 val = -ENOTCONN;
1207 release_sock(sk);
1208 return val;
1209
1210 case TIOCOUTQ:
1211 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1212 if (amount < 0)
1213 amount = 0;
1214 err = put_user(amount, (int __user *)arg);
1215 break;
1216
1217 case TIOCINQ:
1218 lock_sock(sk);
1219 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1220 amount = skb->len;
1221 } else {
1222 struct sk_buff *skb = sk->sk_receive_queue.next;
1223 for(;;) {
1224 if (skb ==
1225 (struct sk_buff *)&sk->sk_receive_queue)
1226 break;
1227 amount += skb->len;
1228 skb = skb->next;
1229 }
1230 }
1231 release_sock(sk);
1232 err = put_user(amount, (int __user *)arg);
1233 break;
1234
1235 default:
1236 err = dev_ioctl(cmd, (void __user *)arg);
1237 break;
1238 }
1239
1240 return err;
1241}
1242
1243static int dn_listen(struct socket *sock, int backlog)
1244{
1245 struct sock *sk = sock->sk;
1246 int err = -EINVAL;
1247
1248 lock_sock(sk);
1249
1250 if (sock_flag(sk, SOCK_ZAPPED))
1251 goto out;
1252
1253 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1254 goto out;
1255
1256 sk->sk_max_ack_backlog = backlog;
1257 sk->sk_ack_backlog = 0;
1258 sk->sk_state = TCP_LISTEN;
1259 err = 0;
1260 dn_rehash_sock(sk);
1261
1262out:
1263 release_sock(sk);
1264
1265 return err;
1266}
1267
1268
1269static int dn_shutdown(struct socket *sock, int how)
1270{
1271 struct sock *sk = sock->sk;
1272 struct dn_scp *scp = DN_SK(sk);
1273 int err = -ENOTCONN;
1274
1275 lock_sock(sk);
1276
1277 if (sock->state == SS_UNCONNECTED)
1278 goto out;
1279
1280 err = 0;
1281 if (sock->state == SS_DISCONNECTING)
1282 goto out;
1283
1284 err = -EINVAL;
1285 if (scp->state == DN_O)
1286 goto out;
1287
1288 if (how != SHUTDOWN_MASK)
1289 goto out;
1290
1291 sk->sk_shutdown = how;
1292 dn_destroy_sock(sk);
1293 err = 0;
1294
1295out:
1296 release_sock(sk);
1297
1298 return err;
1299}
1300
1301static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1302{
1303 struct sock *sk = sock->sk;
1304 int err;
1305
1306 lock_sock(sk);
1307 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1308 release_sock(sk);
1309
1310 return err;
1311}
1312
1313static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1314{
1315 struct sock *sk = sock->sk;
1316 struct dn_scp *scp = DN_SK(sk);
1317 long timeo;
1318 union {
1319 struct optdata_dn opt;
1320 struct accessdata_dn acc;
1321 int mode;
1322 unsigned long win;
1323 int val;
1324 unsigned char services;
1325 unsigned char info;
1326 } u;
1327 int err;
1328
1329 if (optlen && !optval)
1330 return -EINVAL;
1331
1332 if (optlen > sizeof(u))
1333 return -EINVAL;
1334
1335 if (copy_from_user(&u, optval, optlen))
1336 return -EFAULT;
1337
1338 switch(optname) {
1339 case DSO_CONDATA:
1340 if (sock->state == SS_CONNECTED)
1341 return -EISCONN;
1342 if ((scp->state != DN_O) && (scp->state != DN_CR))
1343 return -EINVAL;
1344
1345 if (optlen != sizeof(struct optdata_dn))
1346 return -EINVAL;
1347
1348 if (u.opt.opt_optl > 16)
1349 return -EINVAL;
1350
1351 memcpy(&scp->conndata_out, &u.opt, optlen);
1352 break;
1353
1354 case DSO_DISDATA:
1355 if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1356 return -ENOTCONN;
1357
1358 if (optlen != sizeof(struct optdata_dn))
1359 return -EINVAL;
1360
1361 if (u.opt.opt_optl > 16)
1362 return -EINVAL;
1363
1364 memcpy(&scp->discdata_out, &u.opt, optlen);
1365 break;
1366
1367 case DSO_CONACCESS:
1368 if (sock->state == SS_CONNECTED)
1369 return -EISCONN;
1370 if (scp->state != DN_O)
1371 return -EINVAL;
1372
1373 if (optlen != sizeof(struct accessdata_dn))
1374 return -EINVAL;
1375
1376 if ((u.acc.acc_accl > DN_MAXACCL) ||
1377 (u.acc.acc_passl > DN_MAXACCL) ||
1378 (u.acc.acc_userl > DN_MAXACCL))
1379 return -EINVAL;
1380
1381 memcpy(&scp->accessdata, &u.acc, optlen);
1382 break;
1383
1384 case DSO_ACCEPTMODE:
1385 if (sock->state == SS_CONNECTED)
1386 return -EISCONN;
1387 if (scp->state != DN_O)
1388 return -EINVAL;
1389
1390 if (optlen != sizeof(int))
1391 return -EINVAL;
1392
1393 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1394 return -EINVAL;
1395
1396 scp->accept_mode = (unsigned char)u.mode;
1397 break;
1398
1399 case DSO_CONACCEPT:
1400
1401 if (scp->state != DN_CR)
1402 return -EINVAL;
1403 timeo = sock_rcvtimeo(sk, 0);
1404 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1405 return err;
1406
1407 case DSO_CONREJECT:
1408
1409 if (scp->state != DN_CR)
1410 return -EINVAL;
1411
1412 scp->state = DN_DR;
1413 sk->sk_shutdown = SHUTDOWN_MASK;
1414 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1415 break;
1416
1417 default:
1418#ifdef CONFIG_NETFILTER
1419 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1420#endif
1421 case DSO_LINKINFO:
1422 case DSO_STREAM:
1423 case DSO_SEQPACKET:
1424 return -ENOPROTOOPT;
1425
1426 case DSO_MAXWINDOW:
1427 if (optlen != sizeof(unsigned long))
1428 return -EINVAL;
1429 if (u.win > NSP_MAX_WINDOW)
1430 u.win = NSP_MAX_WINDOW;
1431 if (u.win == 0)
1432 return -EINVAL;
1433 scp->max_window = u.win;
1434 if (scp->snd_window > u.win)
1435 scp->snd_window = u.win;
1436 break;
1437
1438 case DSO_NODELAY:
1439 if (optlen != sizeof(int))
1440 return -EINVAL;
1441 if (scp->nonagle == 2)
1442 return -EINVAL;
1443 scp->nonagle = (u.val == 0) ? 0 : 1;
1444 /* if (scp->nonagle == 1) { Push pending frames } */
1445 break;
1446
1447 case DSO_CORK:
1448 if (optlen != sizeof(int))
1449 return -EINVAL;
1450 if (scp->nonagle == 1)
1451 return -EINVAL;
1452 scp->nonagle = (u.val == 0) ? 0 : 2;
1453 /* if (scp->nonagle == 0) { Push pending frames } */
1454 break;
1455
1456 case DSO_SERVICES:
1457 if (optlen != sizeof(unsigned char))
1458 return -EINVAL;
1459 if ((u.services & ~NSP_FC_MASK) != 0x01)
1460 return -EINVAL;
1461 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1462 return -EINVAL;
1463 scp->services_loc = u.services;
1464 break;
1465
1466 case DSO_INFO:
1467 if (optlen != sizeof(unsigned char))
1468 return -EINVAL;
1469 if (u.info & 0xfc)
1470 return -EINVAL;
1471 scp->info_loc = u.info;
1472 break;
1473 }
1474
1475 return 0;
1476}
1477
1478static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1479{
1480 struct sock *sk = sock->sk;
1481 int err;
1482
1483 lock_sock(sk);
1484 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1485 release_sock(sk);
1486
1487 return err;
1488}
1489
1490static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1491{
1492 struct sock *sk = sock->sk;
1493 struct dn_scp *scp = DN_SK(sk);
1494 struct linkinfo_dn link;
1495 unsigned int r_len;
1496 void *r_data = NULL;
1497 unsigned int val;
1498
1499 if(get_user(r_len , optlen))
1500 return -EFAULT;
1501
1502 switch(optname) {
1503 case DSO_CONDATA:
1504 if (r_len > sizeof(struct optdata_dn))
1505 r_len = sizeof(struct optdata_dn);
1506 r_data = &scp->conndata_in;
1507 break;
1508
1509 case DSO_DISDATA:
1510 if (r_len > sizeof(struct optdata_dn))
1511 r_len = sizeof(struct optdata_dn);
1512 r_data = &scp->discdata_in;
1513 break;
1514
1515 case DSO_CONACCESS:
1516 if (r_len > sizeof(struct accessdata_dn))
1517 r_len = sizeof(struct accessdata_dn);
1518 r_data = &scp->accessdata;
1519 break;
1520
1521 case DSO_ACCEPTMODE:
1522 if (r_len > sizeof(unsigned char))
1523 r_len = sizeof(unsigned char);
1524 r_data = &scp->accept_mode;
1525 break;
1526
1527 case DSO_LINKINFO:
1528 if (r_len > sizeof(struct linkinfo_dn))
1529 r_len = sizeof(struct linkinfo_dn);
1530
1531 switch(sock->state) {
1532 case SS_CONNECTING:
1533 link.idn_linkstate = LL_CONNECTING;
1534 break;
1535 case SS_DISCONNECTING:
1536 link.idn_linkstate = LL_DISCONNECTING;
1537 break;
1538 case SS_CONNECTED:
1539 link.idn_linkstate = LL_RUNNING;
1540 break;
1541 default:
1542 link.idn_linkstate = LL_INACTIVE;
1543 }
1544
1545 link.idn_segsize = scp->segsize_rem;
1546 r_data = &link;
1547 break;
1548
1549 default:
1550#ifdef CONFIG_NETFILTER
1551 {
1552 int val, len;
1553
1554 if(get_user(len, optlen))
1555 return -EFAULT;
1556
1557 val = nf_getsockopt(sk, PF_DECnet, optname,
1558 optval, &len);
1559 if (val >= 0)
1560 val = put_user(len, optlen);
1561 return val;
1562 }
1563#endif
1564 case DSO_STREAM:
1565 case DSO_SEQPACKET:
1566 case DSO_CONACCEPT:
1567 case DSO_CONREJECT:
1568 return -ENOPROTOOPT;
1569
1570 case DSO_MAXWINDOW:
1571 if (r_len > sizeof(unsigned long))
1572 r_len = sizeof(unsigned long);
1573 r_data = &scp->max_window;
1574 break;
1575
1576 case DSO_NODELAY:
1577 if (r_len > sizeof(int))
1578 r_len = sizeof(int);
1579 val = (scp->nonagle == 1);
1580 r_data = &val;
1581 break;
1582
1583 case DSO_CORK:
1584 if (r_len > sizeof(int))
1585 r_len = sizeof(int);
1586 val = (scp->nonagle == 2);
1587 r_data = &val;
1588 break;
1589
1590 case DSO_SERVICES:
1591 if (r_len > sizeof(unsigned char))
1592 r_len = sizeof(unsigned char);
1593 r_data = &scp->services_rem;
1594 break;
1595
1596 case DSO_INFO:
1597 if (r_len > sizeof(unsigned char))
1598 r_len = sizeof(unsigned char);
1599 r_data = &scp->info_rem;
1600 break;
1601 }
1602
1603 if (r_data) {
1604 if (copy_to_user(optval, r_data, r_len))
1605 return -EFAULT;
1606 if (put_user(r_len, optlen))
1607 return -EFAULT;
1608 }
1609
1610 return 0;
1611}
1612
1613
1614static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1615{
1616 struct sk_buff *skb = q->next;
1617 int len = 0;
1618
1619 if (flags & MSG_OOB)
David S. Millerb03efcf2005-07-08 14:57:23 -07001620 return !skb_queue_empty(q) ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621
1622 while(skb != (struct sk_buff *)q) {
1623 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1624 len += skb->len;
1625
1626 if (cb->nsp_flags & 0x40) {
1627 /* SOCK_SEQPACKET reads to EOM */
1628 if (sk->sk_type == SOCK_SEQPACKET)
1629 return 1;
1630 /* so does SOCK_STREAM unless WAITALL is specified */
1631 if (!(flags & MSG_WAITALL))
1632 return 1;
1633 }
1634
1635 /* minimum data length for read exceeded */
1636 if (len >= target)
1637 return 1;
1638
1639 skb = skb->next;
1640 }
1641
1642 return 0;
1643}
1644
1645
1646static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1647 struct msghdr *msg, size_t size, int flags)
1648{
1649 struct sock *sk = sock->sk;
1650 struct dn_scp *scp = DN_SK(sk);
1651 struct sk_buff_head *queue = &sk->sk_receive_queue;
1652 size_t target = size > 1 ? 1 : 0;
1653 size_t copied = 0;
1654 int rv = 0;
1655 struct sk_buff *skb, *nskb;
1656 struct dn_skb_cb *cb = NULL;
1657 unsigned char eor = 0;
1658 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1659
1660 lock_sock(sk);
1661
1662 if (sock_flag(sk, SOCK_ZAPPED)) {
1663 rv = -EADDRNOTAVAIL;
1664 goto out;
1665 }
1666
1667 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1668 if (rv)
1669 goto out;
1670
1671 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1672 if (!(flags & MSG_NOSIGNAL))
1673 send_sig(SIGPIPE, current, 0);
1674 rv = -EPIPE;
1675 goto out;
1676 }
1677
1678 if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1679 rv = -EOPNOTSUPP;
1680 goto out;
1681 }
1682
1683 if (flags & MSG_OOB)
1684 queue = &scp->other_receive_queue;
1685
1686 if (flags & MSG_WAITALL)
1687 target = size;
1688
1689
1690 /*
1691 * See if there is data ready to read, sleep if there isn't
1692 */
1693 for(;;) {
1694 if (sk->sk_err)
1695 goto out;
1696
David S. Millerb03efcf2005-07-08 14:57:23 -07001697 if (!skb_queue_empty(&scp->other_receive_queue)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 if (!(flags & MSG_OOB)) {
1699 msg->msg_flags |= MSG_OOB;
1700 if (!scp->other_report) {
1701 scp->other_report = 1;
1702 goto out;
1703 }
1704 }
1705 }
1706
1707 if (scp->state != DN_RUN)
1708 goto out;
1709
1710 if (signal_pending(current)) {
1711 rv = sock_intr_errno(timeo);
1712 goto out;
1713 }
1714
1715 if (dn_data_ready(sk, queue, flags, target))
1716 break;
1717
1718 if (flags & MSG_DONTWAIT) {
1719 rv = -EWOULDBLOCK;
1720 goto out;
1721 }
1722
1723 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1724 SOCK_SLEEP_PRE(sk)
1725
1726 if (!dn_data_ready(sk, queue, flags, target))
1727 schedule();
1728
1729 SOCK_SLEEP_POST(sk)
1730 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1731 }
1732
1733 for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1734 unsigned int chunk = skb->len;
1735 cb = DN_SKB_CB(skb);
1736
1737 if ((chunk + copied) > size)
1738 chunk = size - copied;
1739
1740 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1741 rv = -EFAULT;
1742 break;
1743 }
1744 copied += chunk;
1745
1746 if (!(flags & MSG_PEEK))
1747 skb_pull(skb, chunk);
1748
1749 eor = cb->nsp_flags & 0x40;
1750 nskb = skb->next;
1751
1752 if (skb->len == 0) {
David S. Miller8728b832005-08-09 19:25:21 -07001753 skb_unlink(skb, queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 kfree_skb(skb);
1755 /*
1756 * N.B. Don't refer to skb or cb after this point
1757 * in loop.
1758 */
1759 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1760 scp->flowloc_sw = DN_SEND;
1761 dn_nsp_send_link(sk, DN_SEND, 0);
1762 }
1763 }
1764
1765 if (eor) {
1766 if (sk->sk_type == SOCK_SEQPACKET)
1767 break;
1768 if (!(flags & MSG_WAITALL))
1769 break;
1770 }
1771
1772 if (flags & MSG_OOB)
1773 break;
1774
1775 if (copied >= target)
1776 break;
1777 }
1778
1779 rv = copied;
1780
1781
1782 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1783 msg->msg_flags |= MSG_EOR;
1784
1785out:
1786 if (rv == 0)
1787 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1788
1789 if ((rv >= 0) && msg->msg_name) {
1790 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1791 msg->msg_namelen = sizeof(struct sockaddr_dn);
1792 }
1793
1794 release_sock(sk);
1795
1796 return rv;
1797}
1798
1799
1800static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1801{
1802 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1803 if (skb_queue_len(queue) >= scp->snd_window)
1804 return 1;
1805 if (fctype != NSP_FC_NONE) {
1806 if (flags & MSG_OOB) {
1807 if (scp->flowrem_oth == 0)
1808 return 1;
1809 } else {
1810 if (scp->flowrem_dat == 0)
1811 return 1;
1812 }
1813 }
1814 return 0;
1815}
1816
1817/*
1818 * The DECnet spec requires the the "routing layer" accepts packets which
1819 * are at least 230 bytes in size. This excludes any headers which the NSP
1820 * layer might add, so we always assume that we'll be using the maximal
1821 * length header on data packets. The variation in length is due to the
1822 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1823 * make much practical difference.
1824 */
1825unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1826{
1827 unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1828 if (dev) {
1829 struct dn_dev *dn_db = dev->dn_ptr;
1830 mtu -= LL_RESERVED_SPACE(dev);
1831 if (dn_db->use_long)
1832 mtu -= 21;
1833 else
1834 mtu -= 6;
1835 mtu -= DN_MAX_NSP_DATA_HEADER;
1836 } else {
1837 /*
1838 * 21 = long header, 16 = guess at MAC header length
1839 */
1840 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1841 }
1842 if (mtu > mss)
1843 mss = mtu;
1844 return mss;
1845}
1846
1847static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1848{
1849 struct dst_entry *dst = __sk_dst_get(sk);
1850 struct dn_scp *scp = DN_SK(sk);
1851 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1852
1853 /* Other data messages are limited to 16 bytes per packet */
1854 if (flags & MSG_OOB)
1855 return 16;
1856
1857 /* This works out the maximum size of segment we can send out */
1858 if (dst) {
1859 u32 mtu = dst_mtu(dst);
1860 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1861 }
1862
1863 return mss_now;
1864}
1865
Patrick Caulfield12a49ff2005-09-01 17:43:45 -07001866/*
1867 * N.B. We get the timeout wrong here, but then we always did get it
1868 * wrong before and this is another step along the road to correcting
1869 * it. It ought to get updated each time we pass through the routine,
1870 * but in practise it probably doesn't matter too much for now.
1871 */
1872static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1873 unsigned long datalen, int noblock,
1874 int *errcode)
1875{
1876 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1877 noblock, errcode);
1878 if (skb) {
1879 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1880 skb->pkt_type = PACKET_OUTGOING;
1881 }
1882 return skb;
1883}
1884
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
Patrick Caulfield12a49ff2005-09-01 17:43:45 -07001886 struct msghdr *msg, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887{
1888 struct sock *sk = sock->sk;
1889 struct dn_scp *scp = DN_SK(sk);
1890 size_t mss;
1891 struct sk_buff_head *queue = &scp->data_xmit_queue;
1892 int flags = msg->msg_flags;
1893 int err = 0;
1894 size_t sent = 0;
1895 int addr_len = msg->msg_namelen;
1896 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1897 struct sk_buff *skb = NULL;
1898 struct dn_skb_cb *cb;
1899 size_t len;
1900 unsigned char fctype;
Patrick Caulfield12a49ff2005-09-01 17:43:45 -07001901 long timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902
1903 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1904 return -EOPNOTSUPP;
1905
1906 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1907 return -EINVAL;
1908
Patrick Caulfield12a49ff2005-09-01 17:43:45 -07001909 lock_sock(sk);
1910 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 /*
1912 * The only difference between stream sockets and sequenced packet
1913 * sockets is that the stream sockets always behave as if MSG_EOR
1914 * has been set.
1915 */
1916 if (sock->type == SOCK_STREAM) {
Patrick Caulfield12a49ff2005-09-01 17:43:45 -07001917 if (flags & MSG_EOR) {
1918 err = -EINVAL;
1919 goto out;
1920 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 flags |= MSG_EOR;
1922 }
1923
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
1925 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1926 if (err)
1927 goto out_err;
1928
1929 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1930 err = -EPIPE;
1931 goto out_err;
1932 }
1933
1934 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1935 dst_negative_advice(&sk->sk_dst_cache);
1936
1937 mss = scp->segsize_rem;
1938 fctype = scp->services_rem & NSP_FC_MASK;
1939
1940 mss = dn_current_mss(sk, flags);
1941
1942 if (flags & MSG_OOB) {
1943 queue = &scp->other_xmit_queue;
1944 if (size > mss) {
1945 err = -EMSGSIZE;
1946 goto out;
1947 }
1948 }
1949
1950 scp->persist_fxn = dn_nsp_xmit_timeout;
1951
1952 while(sent < size) {
1953 err = sock_error(sk);
1954 if (err)
1955 goto out;
1956
1957 if (signal_pending(current)) {
1958 err = sock_intr_errno(timeo);
1959 goto out;
1960 }
1961
1962 /*
1963 * Calculate size that we wish to send.
1964 */
1965 len = size - sent;
1966
1967 if (len > mss)
1968 len = mss;
1969
1970 /*
1971 * Wait for queue size to go down below the window
1972 * size.
1973 */
1974 if (dn_queue_too_long(scp, queue, flags)) {
1975 if (flags & MSG_DONTWAIT) {
1976 err = -EWOULDBLOCK;
1977 goto out;
1978 }
1979
1980 SOCK_SLEEP_PRE(sk)
1981
1982 if (dn_queue_too_long(scp, queue, flags))
1983 schedule();
1984
1985 SOCK_SLEEP_POST(sk)
1986
1987 continue;
1988 }
1989
1990 /*
1991 * Get a suitably sized skb.
Patrick Caulfield12a49ff2005-09-01 17:43:45 -07001992 * 64 is a bit of a hack really, but its larger than any
1993 * link-layer headers and has served us well as a good
1994 * guess as to their real length.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995 */
Patrick Caulfield12a49ff2005-09-01 17:43:45 -07001996 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
1997 flags & MSG_DONTWAIT, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998
1999 if (err)
2000 break;
2001
2002 if (!skb)
2003 continue;
2004
2005 cb = DN_SKB_CB(skb);
2006
Patrick Caulfield12a49ff2005-09-01 17:43:45 -07002007 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008
2009 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2010 err = -EFAULT;
2011 goto out;
2012 }
2013
2014 if (flags & MSG_OOB) {
2015 cb->nsp_flags = 0x30;
2016 if (fctype != NSP_FC_NONE)
2017 scp->flowrem_oth--;
2018 } else {
2019 cb->nsp_flags = 0x00;
2020 if (scp->seg_total == 0)
2021 cb->nsp_flags |= 0x20;
2022
2023 scp->seg_total += len;
2024
2025 if (((sent + len) == size) && (flags & MSG_EOR)) {
2026 cb->nsp_flags |= 0x40;
2027 scp->seg_total = 0;
2028 if (fctype == NSP_FC_SCMC)
2029 scp->flowrem_dat--;
2030 }
2031 if (fctype == NSP_FC_SRC)
2032 scp->flowrem_dat--;
2033 }
2034
2035 sent += len;
2036 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2037 skb = NULL;
2038
2039 scp->persist = dn_nsp_persist(sk);
2040
2041 }
2042out:
2043
2044 if (skb)
2045 kfree_skb(skb);
2046
2047 release_sock(sk);
2048
2049 return sent ? sent : err;
2050
2051out_err:
Steven Whitehouse001ab022005-08-10 11:32:57 -07002052 err = sk_stream_error(sk, flags, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053 release_sock(sk);
2054 return err;
2055}
2056
2057static int dn_device_event(struct notifier_block *this, unsigned long event,
2058 void *ptr)
2059{
2060 struct net_device *dev = (struct net_device *)ptr;
2061
2062 switch(event) {
2063 case NETDEV_UP:
2064 dn_dev_up(dev);
2065 break;
2066 case NETDEV_DOWN:
2067 dn_dev_down(dev);
2068 break;
2069 default:
2070 break;
2071 }
2072
2073 return NOTIFY_DONE;
2074}
2075
2076static struct notifier_block dn_dev_notifier = {
2077 .notifier_call = dn_device_event,
2078};
2079
David S. Millerf2ccd8f2005-08-09 19:34:12 -07002080extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081
2082static struct packet_type dn_dix_packet_type = {
2083 .type = __constant_htons(ETH_P_DNA_RT),
2084 .dev = NULL, /* All devices */
2085 .func = dn_route_rcv,
2086};
2087
2088#ifdef CONFIG_PROC_FS
2089struct dn_iter_state {
2090 int bucket;
2091};
2092
2093static struct sock *dn_socket_get_first(struct seq_file *seq)
2094{
2095 struct dn_iter_state *state = seq->private;
2096 struct sock *n = NULL;
2097
2098 for(state->bucket = 0;
2099 state->bucket < DN_SK_HASH_SIZE;
2100 ++state->bucket) {
2101 n = sk_head(&dn_sk_hash[state->bucket]);
2102 if (n)
2103 break;
2104 }
2105
2106 return n;
2107}
2108
2109static struct sock *dn_socket_get_next(struct seq_file *seq,
2110 struct sock *n)
2111{
2112 struct dn_iter_state *state = seq->private;
2113
2114 n = sk_next(n);
2115try_again:
2116 if (n)
2117 goto out;
2118 if (++state->bucket >= DN_SK_HASH_SIZE)
2119 goto out;
2120 n = sk_head(&dn_sk_hash[state->bucket]);
2121 goto try_again;
2122out:
2123 return n;
2124}
2125
2126static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2127{
2128 struct sock *sk = dn_socket_get_first(seq);
2129
2130 if (sk) {
2131 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2132 --*pos;
2133 }
2134 return *pos ? NULL : sk;
2135}
2136
2137static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2138{
2139 void *rc;
2140 read_lock_bh(&dn_hash_lock);
2141 rc = socket_get_idx(seq, &pos);
2142 if (!rc) {
2143 read_unlock_bh(&dn_hash_lock);
2144 }
2145 return rc;
2146}
2147
2148static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2149{
2150 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2151}
2152
2153static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2154{
2155 void *rc;
2156
2157 if (v == SEQ_START_TOKEN) {
2158 rc = dn_socket_get_idx(seq, 0);
2159 goto out;
2160 }
2161
2162 rc = dn_socket_get_next(seq, v);
2163 if (rc)
2164 goto out;
2165 read_unlock_bh(&dn_hash_lock);
2166out:
2167 ++*pos;
2168 return rc;
2169}
2170
2171static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2172{
2173 if (v && v != SEQ_START_TOKEN)
2174 read_unlock_bh(&dn_hash_lock);
2175}
2176
2177#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2178
2179static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2180{
2181 int i;
2182
2183 switch (dn_ntohs(dn->sdn_objnamel)) {
2184 case 0:
2185 sprintf(buf, "%d", dn->sdn_objnum);
2186 break;
2187 default:
2188 for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2189 buf[i] = dn->sdn_objname[i];
2190 if (IS_NOT_PRINTABLE(buf[i]))
2191 buf[i] = '.';
2192 }
2193 buf[i] = 0;
2194 }
2195}
2196
2197static char *dn_state2asc(unsigned char state)
2198{
2199 switch(state) {
2200 case DN_O:
2201 return "OPEN";
2202 case DN_CR:
2203 return " CR";
2204 case DN_DR:
2205 return " DR";
2206 case DN_DRC:
2207 return " DRC";
2208 case DN_CC:
2209 return " CC";
2210 case DN_CI:
2211 return " CI";
2212 case DN_NR:
2213 return " NR";
2214 case DN_NC:
2215 return " NC";
2216 case DN_CD:
2217 return " CD";
2218 case DN_RJ:
2219 return " RJ";
2220 case DN_RUN:
2221 return " RUN";
2222 case DN_DI:
2223 return " DI";
2224 case DN_DIC:
2225 return " DIC";
2226 case DN_DN:
2227 return " DN";
2228 case DN_CL:
2229 return " CL";
2230 case DN_CN:
2231 return " CN";
2232 }
2233
2234 return "????";
2235}
2236
2237static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2238{
2239 struct dn_scp *scp = DN_SK(sk);
2240 char buf1[DN_ASCBUF_LEN];
2241 char buf2[DN_ASCBUF_LEN];
2242 char local_object[DN_MAXOBJL+3];
2243 char remote_object[DN_MAXOBJL+3];
2244
2245 dn_printable_object(&scp->addr, local_object);
2246 dn_printable_object(&scp->peer, remote_object);
2247
2248 seq_printf(seq,
2249 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2250 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2251 dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2252 scp->addrloc,
2253 scp->numdat,
2254 scp->numoth,
2255 scp->ackxmt_dat,
2256 scp->ackxmt_oth,
2257 scp->flowloc_sw,
2258 local_object,
2259 dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2260 scp->addrrem,
2261 scp->numdat_rcv,
2262 scp->numoth_rcv,
2263 scp->ackrcv_dat,
2264 scp->ackrcv_oth,
2265 scp->flowrem_sw,
2266 remote_object,
2267 dn_state2asc(scp->state),
2268 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2269}
2270
2271static int dn_socket_seq_show(struct seq_file *seq, void *v)
2272{
2273 if (v == SEQ_START_TOKEN) {
2274 seq_puts(seq, "Local Remote\n");
2275 } else {
2276 dn_socket_format_entry(seq, v);
2277 }
2278 return 0;
2279}
2280
2281static struct seq_operations dn_socket_seq_ops = {
2282 .start = dn_socket_seq_start,
2283 .next = dn_socket_seq_next,
2284 .stop = dn_socket_seq_stop,
2285 .show = dn_socket_seq_show,
2286};
2287
2288static int dn_socket_seq_open(struct inode *inode, struct file *file)
2289{
2290 struct seq_file *seq;
2291 int rc = -ENOMEM;
2292 struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2293
2294 if (!s)
2295 goto out;
2296
2297 rc = seq_open(file, &dn_socket_seq_ops);
2298 if (rc)
2299 goto out_kfree;
2300
2301 seq = file->private_data;
2302 seq->private = s;
2303 memset(s, 0, sizeof(*s));
2304out:
2305 return rc;
2306out_kfree:
2307 kfree(s);
2308 goto out;
2309}
2310
2311static struct file_operations dn_socket_seq_fops = {
2312 .owner = THIS_MODULE,
2313 .open = dn_socket_seq_open,
2314 .read = seq_read,
2315 .llseek = seq_lseek,
2316 .release = seq_release_private,
2317};
2318#endif
2319
2320static struct net_proto_family dn_family_ops = {
2321 .family = AF_DECnet,
2322 .create = dn_create,
2323 .owner = THIS_MODULE,
2324};
2325
2326static struct proto_ops dn_proto_ops = {
2327 .family = AF_DECnet,
2328 .owner = THIS_MODULE,
2329 .release = dn_release,
2330 .bind = dn_bind,
2331 .connect = dn_connect,
2332 .socketpair = sock_no_socketpair,
2333 .accept = dn_accept,
2334 .getname = dn_getname,
2335 .poll = dn_poll,
2336 .ioctl = dn_ioctl,
2337 .listen = dn_listen,
2338 .shutdown = dn_shutdown,
2339 .setsockopt = dn_setsockopt,
2340 .getsockopt = dn_getsockopt,
2341 .sendmsg = dn_sendmsg,
2342 .recvmsg = dn_recvmsg,
2343 .mmap = sock_no_mmap,
2344 .sendpage = sock_no_sendpage,
2345};
2346
2347void dn_register_sysctl(void);
2348void dn_unregister_sysctl(void);
2349
2350MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2351MODULE_AUTHOR("Linux DECnet Project Team");
2352MODULE_LICENSE("GPL");
2353MODULE_ALIAS_NETPROTO(PF_DECnet);
2354
2355static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2356
2357static int __init decnet_init(void)
2358{
2359 int rc;
2360
2361 printk(banner);
2362
2363 rc = proto_register(&dn_proto, 1);
2364 if (rc != 0)
2365 goto out;
2366
2367 dn_neigh_init();
2368 dn_dev_init();
2369 dn_route_init();
2370 dn_fib_init();
2371
2372 sock_register(&dn_family_ops);
2373 dev_add_pack(&dn_dix_packet_type);
2374 register_netdevice_notifier(&dn_dev_notifier);
2375
2376 proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2377 dn_register_sysctl();
2378out:
2379 return rc;
2380
2381}
2382module_init(decnet_init);
2383
2384/*
2385 * Prevent DECnet module unloading until its fixed properly.
2386 * Requires an audit of the code to check for memory leaks and
2387 * initialisation problems etc.
2388 */
2389#if 0
2390static void __exit decnet_exit(void)
2391{
2392 sock_unregister(AF_DECnet);
2393 dev_remove_pack(&dn_dix_packet_type);
2394
2395 dn_unregister_sysctl();
2396
2397 unregister_netdevice_notifier(&dn_dev_notifier);
2398
2399 dn_route_cleanup();
2400 dn_dev_cleanup();
2401 dn_neigh_cleanup();
2402 dn_fib_cleanup();
2403
2404 proc_net_remove("decnet");
2405
2406 proto_unregister(&dn_proto);
2407}
2408module_exit(decnet_exit);
2409#endif