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1// SPDX-License-Identifier: GPL-2.0-or-later
2
3/*
4 * DECnet An implementation of the DECnet protocol suite for the LINUX
5 * operating system. DECnet is implemented using the BSD Socket
6 * interface as the means of communication with the user level.
7 *
8 * DECnet Socket Layer Interface
9 *
10 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
11 * Patrick Caulfield <patrick@pandh.demon.co.uk>
12 *
13 * Changes:
14 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
15 * version of the code. Original copyright preserved
16 * below.
17 * Steve Whitehouse: Some bug fixes, cleaning up some code to make it
18 * compatible with my routing layer.
19 * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
20 * Caulfield.
21 * Steve Whitehouse: Further bug fixes, checking module code still works
22 * with new routing layer.
23 * Steve Whitehouse: Additional set/get_sockopt() calls.
24 * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
25 * code.
26 * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
27 * way. Didn't manage it entirely, but its better.
28 * Steve Whitehouse: ditto for sendmsg().
29 * Steve Whitehouse: A selection of bug fixes to various things.
30 * Steve Whitehouse: Added TIOCOUTQ ioctl.
31 * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
32 * Steve Whitehouse: Fixes to connect() error returns.
33 * Patrick Caulfield: Fixes to delayed acceptance logic.
34 * David S. Miller: New socket locking
35 * Steve Whitehouse: Socket list hashing/locking
36 * Arnaldo C. Melo: use capable, not suser
37 * Steve Whitehouse: Removed unused code. Fix to use sk->allocation
38 * when required.
39 * Patrick Caulfield: /proc/net/decnet now has object name/number
40 * Steve Whitehouse: Fixed local port allocation, hashed sk list
41 * Matthew Wilcox: Fixes for dn_ioctl()
42 * Steve Whitehouse: New connect/accept logic to allow timeouts and
43 * prepare for sendpage etc.
44 */
45
46
47/******************************************************************************
48 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
49
50
51HISTORY:
52
53Version Kernel Date Author/Comments
54------- ------ ---- ---------------
55Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
56 (emserrat@geocities.com)
57
58 First Development of DECnet Socket La-
59 yer for Linux. Only supports outgoing
60 connections.
61
62Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
63 (patrick@pandh.demon.co.uk)
64
65 Port to new kernel development version.
66
67Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
68 (emserrat@geocities.com)
69 _
70 Added support for incoming connections
71 so we can start developing server apps
72 on Linux.
73 -
74 Module Support
75Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
76 (emserrat@geocities.com)
77 _
78 Added support for X11R6.4. Now we can
79 use DECnet transport for X on Linux!!!
80 -
81Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
82 (emserrat@geocities.com)
83 Removed bugs on flow control
84 Removed bugs on incoming accessdata
85 order
86 -
87Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
88 dn_recvmsg fixes
89
90 Patrick J. Caulfield
91 dn_bind fixes
92*******************************************************************************/
93
94#include <linux/module.h>
95#include <linux/errno.h>
96#include <linux/types.h>
97#include <linux/slab.h>
98#include <linux/socket.h>
99#include <linux/in.h>
100#include <linux/kernel.h>
101#include <linux/sched/signal.h>
102#include <linux/timer.h>
103#include <linux/string.h>
104#include <linux/sockios.h>
105#include <linux/net.h>
106#include <linux/netdevice.h>
107#include <linux/inet.h>
108#include <linux/route.h>
109#include <linux/netfilter.h>
110#include <linux/seq_file.h>
111#include <net/sock.h>
112#include <net/tcp_states.h>
113#include <net/flow.h>
114#include <asm/ioctls.h>
115#include <linux/capability.h>
116#include <linux/mm.h>
117#include <linux/interrupt.h>
118#include <linux/proc_fs.h>
119#include <linux/stat.h>
120#include <linux/init.h>
121#include <linux/poll.h>
122#include <linux/jiffies.h>
123#include <net/net_namespace.h>
124#include <net/neighbour.h>
125#include <net/dst.h>
126#include <net/fib_rules.h>
127#include <net/tcp.h>
128#include <net/dn.h>
129#include <net/dn_nsp.h>
130#include <net/dn_dev.h>
131#include <net/dn_route.h>
132#include <net/dn_fib.h>
133#include <net/dn_neigh.h>
134
135struct dn_sock {
136 struct sock sk;
137 struct dn_scp scp;
138};
139
140static void dn_keepalive(struct sock *sk);
141
142#define DN_SK_HASH_SHIFT 8
143#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
144#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
145
146
147static const struct proto_ops dn_proto_ops;
148static DEFINE_RWLOCK(dn_hash_lock);
149static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
150static struct hlist_head dn_wild_sk;
151static atomic_long_t decnet_memory_allocated;
152
153static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
154static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
155
156static struct hlist_head *dn_find_list(struct sock *sk)
157{
158 struct dn_scp *scp = DN_SK(sk);
159
160 if (scp->addr.sdn_flags & SDF_WILD)
161 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
162
163 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
164}
165
166/*
167 * Valid ports are those greater than zero and not already in use.
168 */
169static int check_port(__le16 port)
170{
171 struct sock *sk;
172
173 if (port == 0)
174 return -1;
175
176 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
177 struct dn_scp *scp = DN_SK(sk);
178 if (scp->addrloc == port)
179 return -1;
180 }
181 return 0;
182}
183
184static unsigned short port_alloc(struct sock *sk)
185{
186 struct dn_scp *scp = DN_SK(sk);
187 static unsigned short port = 0x2000;
188 unsigned short i_port = port;
189
190 while(check_port(cpu_to_le16(++port)) != 0) {
191 if (port == i_port)
192 return 0;
193 }
194
195 scp->addrloc = cpu_to_le16(port);
196
197 return 1;
198}
199
200/*
201 * Since this is only ever called from user
202 * level, we don't need a write_lock() version
203 * of this.
204 */
205static int dn_hash_sock(struct sock *sk)
206{
207 struct dn_scp *scp = DN_SK(sk);
208 struct hlist_head *list;
209 int rv = -EUSERS;
210
211 BUG_ON(sk_hashed(sk));
212
213 write_lock_bh(&dn_hash_lock);
214
215 if (!scp->addrloc && !port_alloc(sk))
216 goto out;
217
218 rv = -EADDRINUSE;
219 if ((list = dn_find_list(sk)) == NULL)
220 goto out;
221
222 sk_add_node(sk, list);
223 rv = 0;
224out:
225 write_unlock_bh(&dn_hash_lock);
226 return rv;
227}
228
229static void dn_unhash_sock(struct sock *sk)
230{
231 write_lock(&dn_hash_lock);
232 sk_del_node_init(sk);
233 write_unlock(&dn_hash_lock);
234}
235
236static void dn_unhash_sock_bh(struct sock *sk)
237{
238 write_lock_bh(&dn_hash_lock);
239 sk_del_node_init(sk);
240 write_unlock_bh(&dn_hash_lock);
241}
242
243static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
244{
245 int i;
246 unsigned int hash = addr->sdn_objnum;
247
248 if (hash == 0) {
249 hash = addr->sdn_objnamel;
250 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
251 hash ^= addr->sdn_objname[i];
252 hash ^= (hash << 3);
253 }
254 }
255
256 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
257}
258
259/*
260 * Called to transform a socket from bound (i.e. with a local address)
261 * into a listening socket (doesn't need a local port number) and rehashes
262 * based upon the object name/number.
263 */
264static void dn_rehash_sock(struct sock *sk)
265{
266 struct hlist_head *list;
267 struct dn_scp *scp = DN_SK(sk);
268
269 if (scp->addr.sdn_flags & SDF_WILD)
270 return;
271
272 write_lock_bh(&dn_hash_lock);
273 sk_del_node_init(sk);
274 DN_SK(sk)->addrloc = 0;
275 list = listen_hash(&DN_SK(sk)->addr);
276 sk_add_node(sk, list);
277 write_unlock_bh(&dn_hash_lock);
278}
279
280int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
281{
282 int len = 2;
283
284 *buf++ = type;
285
286 switch (type) {
287 case 0:
288 *buf++ = sdn->sdn_objnum;
289 break;
290 case 1:
291 *buf++ = 0;
292 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
293 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
294 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
295 break;
296 case 2:
297 memset(buf, 0, 5);
298 buf += 5;
299 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
300 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
301 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
302 break;
303 }
304
305 return len;
306}
307
308/*
309 * On reception of usernames, we handle types 1 and 0 for destination
310 * addresses only. Types 2 and 4 are used for source addresses, but the
311 * UIC, GIC are ignored and they are both treated the same way. Type 3
312 * is never used as I've no idea what its purpose might be or what its
313 * format is.
314 */
315int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
316{
317 unsigned char type;
318 int size = len;
319 int namel = 12;
320
321 sdn->sdn_objnum = 0;
322 sdn->sdn_objnamel = cpu_to_le16(0);
323 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
324
325 if (len < 2)
326 return -1;
327
328 len -= 2;
329 *fmt = *data++;
330 type = *data++;
331
332 switch (*fmt) {
333 case 0:
334 sdn->sdn_objnum = type;
335 return 2;
336 case 1:
337 namel = 16;
338 break;
339 case 2:
340 len -= 4;
341 data += 4;
342 break;
343 case 4:
344 len -= 8;
345 data += 8;
346 break;
347 default:
348 return -1;
349 }
350
351 len -= 1;
352
353 if (len < 0)
354 return -1;
355
356 sdn->sdn_objnamel = cpu_to_le16(*data++);
357 len -= le16_to_cpu(sdn->sdn_objnamel);
358
359 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
360 return -1;
361
362 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
363
364 return size - len;
365}
366
367struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
368{
369 struct hlist_head *list = listen_hash(addr);
370 struct sock *sk;
371
372 read_lock(&dn_hash_lock);
373 sk_for_each(sk, list) {
374 struct dn_scp *scp = DN_SK(sk);
375 if (sk->sk_state != TCP_LISTEN)
376 continue;
377 if (scp->addr.sdn_objnum) {
378 if (scp->addr.sdn_objnum != addr->sdn_objnum)
379 continue;
380 } else {
381 if (addr->sdn_objnum)
382 continue;
383 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
384 continue;
385 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
386 continue;
387 }
388 sock_hold(sk);
389 read_unlock(&dn_hash_lock);
390 return sk;
391 }
392
393 sk = sk_head(&dn_wild_sk);
394 if (sk) {
395 if (sk->sk_state == TCP_LISTEN)
396 sock_hold(sk);
397 else
398 sk = NULL;
399 }
400
401 read_unlock(&dn_hash_lock);
402 return sk;
403}
404
405struct sock *dn_find_by_skb(struct sk_buff *skb)
406{
407 struct dn_skb_cb *cb = DN_SKB_CB(skb);
408 struct sock *sk;
409 struct dn_scp *scp;
410
411 read_lock(&dn_hash_lock);
412 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
413 scp = DN_SK(sk);
414 if (cb->src != dn_saddr2dn(&scp->peer))
415 continue;
416 if (cb->dst_port != scp->addrloc)
417 continue;
418 if (scp->addrrem && (cb->src_port != scp->addrrem))
419 continue;
420 sock_hold(sk);
421 goto found;
422 }
423 sk = NULL;
424found:
425 read_unlock(&dn_hash_lock);
426 return sk;
427}
428
429
430
431static void dn_destruct(struct sock *sk)
432{
433 struct dn_scp *scp = DN_SK(sk);
434
435 skb_queue_purge(&scp->data_xmit_queue);
436 skb_queue_purge(&scp->other_xmit_queue);
437 skb_queue_purge(&scp->other_receive_queue);
438
439 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
440}
441
442static unsigned long dn_memory_pressure;
443
444static void dn_enter_memory_pressure(struct sock *sk)
445{
446 if (!dn_memory_pressure) {
447 dn_memory_pressure = 1;
448 }
449}
450
451static struct proto dn_proto = {
452 .name = "NSP",
453 .owner = THIS_MODULE,
454 .enter_memory_pressure = dn_enter_memory_pressure,
455 .memory_pressure = &dn_memory_pressure,
456 .memory_allocated = &decnet_memory_allocated,
457 .sysctl_mem = sysctl_decnet_mem,
458 .sysctl_wmem = sysctl_decnet_wmem,
459 .sysctl_rmem = sysctl_decnet_rmem,
460 .max_header = DN_MAX_NSP_DATA_HEADER + 64,
461 .obj_size = sizeof(struct dn_sock),
462};
463
464static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
465{
466 struct dn_scp *scp;
467 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
468
469 if (!sk)
470 goto out;
471
472 if (sock)
473 sock->ops = &dn_proto_ops;
474 sock_init_data(sock, sk);
475
476 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
477 sk->sk_destruct = dn_destruct;
478 sk->sk_no_check_tx = 1;
479 sk->sk_family = PF_DECnet;
480 sk->sk_protocol = 0;
481 sk->sk_allocation = gfp;
482 sk->sk_sndbuf = sysctl_decnet_wmem[1];
483 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
484
485 /* Initialization of DECnet Session Control Port */
486 scp = DN_SK(sk);
487 scp->state = DN_O; /* Open */
488 scp->numdat = 1; /* Next data seg to tx */
489 scp->numoth = 1; /* Next oth data to tx */
490 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
491 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
492 scp->ackrcv_dat = 0; /* Highest data ack recv*/
493 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
494 scp->flowrem_sw = DN_SEND;
495 scp->flowloc_sw = DN_SEND;
496 scp->flowrem_dat = 0;
497 scp->flowrem_oth = 1;
498 scp->flowloc_dat = 0;
499 scp->flowloc_oth = 1;
500 scp->services_rem = 0;
501 scp->services_loc = 1 | NSP_FC_NONE;
502 scp->info_rem = 0;
503 scp->info_loc = 0x03; /* NSP version 4.1 */
504 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
505 scp->nonagle = 0;
506 scp->multi_ireq = 1;
507 scp->accept_mode = ACC_IMMED;
508 scp->addr.sdn_family = AF_DECnet;
509 scp->peer.sdn_family = AF_DECnet;
510 scp->accessdata.acc_accl = 5;
511 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
512
513 scp->max_window = NSP_MAX_WINDOW;
514 scp->snd_window = NSP_MIN_WINDOW;
515 scp->nsp_srtt = NSP_INITIAL_SRTT;
516 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
517 scp->nsp_rxtshift = 0;
518
519 skb_queue_head_init(&scp->data_xmit_queue);
520 skb_queue_head_init(&scp->other_xmit_queue);
521 skb_queue_head_init(&scp->other_receive_queue);
522
523 scp->persist = 0;
524 scp->persist_fxn = NULL;
525 scp->keepalive = 10 * HZ;
526 scp->keepalive_fxn = dn_keepalive;
527
528 dn_start_slow_timer(sk);
529out:
530 return sk;
531}
532
533/*
534 * Keepalive timer.
535 * FIXME: Should respond to SO_KEEPALIVE etc.
536 */
537static void dn_keepalive(struct sock *sk)
538{
539 struct dn_scp *scp = DN_SK(sk);
540
541 /*
542 * By checking the other_data transmit queue is empty
543 * we are double checking that we are not sending too
544 * many of these keepalive frames.
545 */
546 if (skb_queue_empty(&scp->other_xmit_queue))
547 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
548}
549
550
551/*
552 * Timer for shutdown/destroyed sockets.
553 * When socket is dead & no packets have been sent for a
554 * certain amount of time, they are removed by this
555 * routine. Also takes care of sending out DI & DC
556 * frames at correct times.
557 */
558int dn_destroy_timer(struct sock *sk)
559{
560 struct dn_scp *scp = DN_SK(sk);
561
562 scp->persist = dn_nsp_persist(sk);
563
564 switch (scp->state) {
565 case DN_DI:
566 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
567 if (scp->nsp_rxtshift >= decnet_di_count)
568 scp->state = DN_CN;
569 return 0;
570
571 case DN_DR:
572 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
573 if (scp->nsp_rxtshift >= decnet_dr_count)
574 scp->state = DN_DRC;
575 return 0;
576
577 case DN_DN:
578 if (scp->nsp_rxtshift < decnet_dn_count) {
579 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
580 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
581 GFP_ATOMIC);
582 return 0;
583 }
584 }
585
586 scp->persist = (HZ * decnet_time_wait);
587
588 if (sk->sk_socket)
589 return 0;
590
591 if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
592 dn_unhash_sock(sk);
593 sock_put(sk);
594 return 1;
595 }
596
597 return 0;
598}
599
600static void dn_destroy_sock(struct sock *sk)
601{
602 struct dn_scp *scp = DN_SK(sk);
603
604 scp->nsp_rxtshift = 0; /* reset back off */
605
606 if (sk->sk_socket) {
607 if (sk->sk_socket->state != SS_UNCONNECTED)
608 sk->sk_socket->state = SS_DISCONNECTING;
609 }
610
611 sk->sk_state = TCP_CLOSE;
612
613 switch (scp->state) {
614 case DN_DN:
615 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
616 sk->sk_allocation);
617 scp->persist_fxn = dn_destroy_timer;
618 scp->persist = dn_nsp_persist(sk);
619 break;
620 case DN_CR:
621 scp->state = DN_DR;
622 goto disc_reject;
623 case DN_RUN:
624 scp->state = DN_DI;
625 /* fall through */
626 case DN_DI:
627 case DN_DR:
628disc_reject:
629 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
630 /* fall through */
631 case DN_NC:
632 case DN_NR:
633 case DN_RJ:
634 case DN_DIC:
635 case DN_CN:
636 case DN_DRC:
637 case DN_CI:
638 case DN_CD:
639 scp->persist_fxn = dn_destroy_timer;
640 scp->persist = dn_nsp_persist(sk);
641 break;
642 default:
643 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
644 /* fall through */
645 case DN_O:
646 dn_stop_slow_timer(sk);
647
648 dn_unhash_sock_bh(sk);
649 sock_put(sk);
650
651 break;
652 }
653}
654
655char *dn_addr2asc(__u16 addr, char *buf)
656{
657 unsigned short node, area;
658
659 node = addr & 0x03ff;
660 area = addr >> 10;
661 sprintf(buf, "%hd.%hd", area, node);
662
663 return buf;
664}
665
666
667
668static int dn_create(struct net *net, struct socket *sock, int protocol,
669 int kern)
670{
671 struct sock *sk;
672
673 if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
674 return -EINVAL;
675
676 if (!net_eq(net, &init_net))
677 return -EAFNOSUPPORT;
678
679 switch (sock->type) {
680 case SOCK_SEQPACKET:
681 if (protocol != DNPROTO_NSP)
682 return -EPROTONOSUPPORT;
683 break;
684 case SOCK_STREAM:
685 break;
686 default:
687 return -ESOCKTNOSUPPORT;
688 }
689
690
691 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
692 return -ENOBUFS;
693
694 sk->sk_protocol = protocol;
695
696 return 0;
697}
698
699
700static int
701dn_release(struct socket *sock)
702{
703 struct sock *sk = sock->sk;
704
705 if (sk) {
706 sock_orphan(sk);
707 sock_hold(sk);
708 lock_sock(sk);
709 dn_destroy_sock(sk);
710 release_sock(sk);
711 sock_put(sk);
712 }
713
714 return 0;
715}
716
717static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
718{
719 struct sock *sk = sock->sk;
720 struct dn_scp *scp = DN_SK(sk);
721 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
722 struct net_device *dev, *ldev;
723 int rv;
724
725 if (addr_len != sizeof(struct sockaddr_dn))
726 return -EINVAL;
727
728 if (saddr->sdn_family != AF_DECnet)
729 return -EINVAL;
730
731 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
732 return -EINVAL;
733
734 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
735 return -EINVAL;
736
737 if (saddr->sdn_flags & ~SDF_WILD)
738 return -EINVAL;
739
740 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
741 (saddr->sdn_flags & SDF_WILD)))
742 return -EACCES;
743
744 if (!(saddr->sdn_flags & SDF_WILD)) {
745 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
746 rcu_read_lock();
747 ldev = NULL;
748 for_each_netdev_rcu(&init_net, dev) {
749 if (!dev->dn_ptr)
750 continue;
751 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
752 ldev = dev;
753 break;
754 }
755 }
756 rcu_read_unlock();
757 if (ldev == NULL)
758 return -EADDRNOTAVAIL;
759 }
760 }
761
762 rv = -EINVAL;
763 lock_sock(sk);
764 if (sock_flag(sk, SOCK_ZAPPED)) {
765 memcpy(&scp->addr, saddr, addr_len);
766 sock_reset_flag(sk, SOCK_ZAPPED);
767
768 rv = dn_hash_sock(sk);
769 if (rv)
770 sock_set_flag(sk, SOCK_ZAPPED);
771 }
772 release_sock(sk);
773
774 return rv;
775}
776
777
778static int dn_auto_bind(struct socket *sock)
779{
780 struct sock *sk = sock->sk;
781 struct dn_scp *scp = DN_SK(sk);
782 int rv;
783
784 sock_reset_flag(sk, SOCK_ZAPPED);
785
786 scp->addr.sdn_flags = 0;
787 scp->addr.sdn_objnum = 0;
788
789 /*
790 * This stuff is to keep compatibility with Eduardo's
791 * patch. I hope I can dispense with it shortly...
792 */
793 if ((scp->accessdata.acc_accl != 0) &&
794 (scp->accessdata.acc_accl <= 12)) {
795
796 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
797 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
798
799 scp->accessdata.acc_accl = 0;
800 memset(scp->accessdata.acc_acc, 0, 40);
801 }
802 /* End of compatibility stuff */
803
804 scp->addr.sdn_add.a_len = cpu_to_le16(2);
805 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
806 if (rv == 0) {
807 rv = dn_hash_sock(sk);
808 if (rv)
809 sock_set_flag(sk, SOCK_ZAPPED);
810 }
811
812 return rv;
813}
814
815static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
816{
817 struct dn_scp *scp = DN_SK(sk);
818 DEFINE_WAIT(wait);
819 int err;
820
821 if (scp->state != DN_CR)
822 return -EINVAL;
823
824 scp->state = DN_CC;
825 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
826 dn_send_conn_conf(sk, allocation);
827
828 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
829 for(;;) {
830 release_sock(sk);
831 if (scp->state == DN_CC)
832 *timeo = schedule_timeout(*timeo);
833 lock_sock(sk);
834 err = 0;
835 if (scp->state == DN_RUN)
836 break;
837 err = sock_error(sk);
838 if (err)
839 break;
840 err = sock_intr_errno(*timeo);
841 if (signal_pending(current))
842 break;
843 err = -EAGAIN;
844 if (!*timeo)
845 break;
846 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
847 }
848 finish_wait(sk_sleep(sk), &wait);
849 if (err == 0) {
850 sk->sk_socket->state = SS_CONNECTED;
851 } else if (scp->state != DN_CC) {
852 sk->sk_socket->state = SS_UNCONNECTED;
853 }
854 return err;
855}
856
857static int dn_wait_run(struct sock *sk, long *timeo)
858{
859 struct dn_scp *scp = DN_SK(sk);
860 DEFINE_WAIT(wait);
861 int err = 0;
862
863 if (scp->state == DN_RUN)
864 goto out;
865
866 if (!*timeo)
867 return -EALREADY;
868
869 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
870 for(;;) {
871 release_sock(sk);
872 if (scp->state == DN_CI || scp->state == DN_CC)
873 *timeo = schedule_timeout(*timeo);
874 lock_sock(sk);
875 err = 0;
876 if (scp->state == DN_RUN)
877 break;
878 err = sock_error(sk);
879 if (err)
880 break;
881 err = sock_intr_errno(*timeo);
882 if (signal_pending(current))
883 break;
884 err = -ETIMEDOUT;
885 if (!*timeo)
886 break;
887 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
888 }
889 finish_wait(sk_sleep(sk), &wait);
890out:
891 if (err == 0) {
892 sk->sk_socket->state = SS_CONNECTED;
893 } else if (scp->state != DN_CI && scp->state != DN_CC) {
894 sk->sk_socket->state = SS_UNCONNECTED;
895 }
896 return err;
897}
898
899static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
900{
901 struct socket *sock = sk->sk_socket;
902 struct dn_scp *scp = DN_SK(sk);
903 int err = -EISCONN;
904 struct flowidn fld;
905 struct dst_entry *dst;
906
907 if (sock->state == SS_CONNECTED)
908 goto out;
909
910 if (sock->state == SS_CONNECTING) {
911 err = 0;
912 if (scp->state == DN_RUN) {
913 sock->state = SS_CONNECTED;
914 goto out;
915 }
916 err = -ECONNREFUSED;
917 if (scp->state != DN_CI && scp->state != DN_CC) {
918 sock->state = SS_UNCONNECTED;
919 goto out;
920 }
921 return dn_wait_run(sk, timeo);
922 }
923
924 err = -EINVAL;
925 if (scp->state != DN_O)
926 goto out;
927
928 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
929 goto out;
930 if (addr->sdn_family != AF_DECnet)
931 goto out;
932 if (addr->sdn_flags & SDF_WILD)
933 goto out;
934
935 if (sock_flag(sk, SOCK_ZAPPED)) {
936 err = dn_auto_bind(sk->sk_socket);
937 if (err)
938 goto out;
939 }
940
941 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
942
943 err = -EHOSTUNREACH;
944 memset(&fld, 0, sizeof(fld));
945 fld.flowidn_oif = sk->sk_bound_dev_if;
946 fld.daddr = dn_saddr2dn(&scp->peer);
947 fld.saddr = dn_saddr2dn(&scp->addr);
948 dn_sk_ports_copy(&fld, scp);
949 fld.flowidn_proto = DNPROTO_NSP;
950 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
951 goto out;
952 dst = __sk_dst_get(sk);
953 sk->sk_route_caps = dst->dev->features;
954 sock->state = SS_CONNECTING;
955 scp->state = DN_CI;
956 scp->segsize_loc = dst_metric_advmss(dst);
957
958 dn_nsp_send_conninit(sk, NSP_CI);
959 err = -EINPROGRESS;
960 if (*timeo) {
961 err = dn_wait_run(sk, timeo);
962 }
963out:
964 return err;
965}
966
967static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
968{
969 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
970 struct sock *sk = sock->sk;
971 int err;
972 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
973
974 lock_sock(sk);
975 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
976 release_sock(sk);
977
978 return err;
979}
980
981static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
982{
983 struct dn_scp *scp = DN_SK(sk);
984
985 switch (scp->state) {
986 case DN_RUN:
987 return 0;
988 case DN_CR:
989 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
990 case DN_CI:
991 case DN_CC:
992 return dn_wait_run(sk, timeo);
993 case DN_O:
994 return __dn_connect(sk, addr, addrlen, timeo, flags);
995 }
996
997 return -EINVAL;
998}
999
1000
1001static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1002{
1003 unsigned char *ptr = skb->data;
1004
1005 acc->acc_userl = *ptr++;
1006 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1007 ptr += acc->acc_userl;
1008
1009 acc->acc_passl = *ptr++;
1010 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1011 ptr += acc->acc_passl;
1012
1013 acc->acc_accl = *ptr++;
1014 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1015
1016 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1017
1018}
1019
1020static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1021{
1022 unsigned char *ptr = skb->data;
1023 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1024
1025 BUG_ON(len > 16); /* we've checked the contents earlier */
1026 opt->opt_optl = cpu_to_le16(len);
1027 opt->opt_status = 0;
1028 memcpy(opt->opt_data, ptr, len);
1029 skb_pull(skb, len + 1);
1030}
1031
1032static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1033{
1034 DEFINE_WAIT(wait);
1035 struct sk_buff *skb = NULL;
1036 int err = 0;
1037
1038 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1039 for(;;) {
1040 release_sock(sk);
1041 skb = skb_dequeue(&sk->sk_receive_queue);
1042 if (skb == NULL) {
1043 *timeo = schedule_timeout(*timeo);
1044 skb = skb_dequeue(&sk->sk_receive_queue);
1045 }
1046 lock_sock(sk);
1047 if (skb != NULL)
1048 break;
1049 err = -EINVAL;
1050 if (sk->sk_state != TCP_LISTEN)
1051 break;
1052 err = sock_intr_errno(*timeo);
1053 if (signal_pending(current))
1054 break;
1055 err = -EAGAIN;
1056 if (!*timeo)
1057 break;
1058 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1059 }
1060 finish_wait(sk_sleep(sk), &wait);
1061
1062 return skb == NULL ? ERR_PTR(err) : skb;
1063}
1064
1065static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
1066 bool kern)
1067{
1068 struct sock *sk = sock->sk, *newsk;
1069 struct sk_buff *skb = NULL;
1070 struct dn_skb_cb *cb;
1071 unsigned char menuver;
1072 int err = 0;
1073 unsigned char type;
1074 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1075 struct dst_entry *dst;
1076
1077 lock_sock(sk);
1078
1079 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1080 release_sock(sk);
1081 return -EINVAL;
1082 }
1083
1084 skb = skb_dequeue(&sk->sk_receive_queue);
1085 if (skb == NULL) {
1086 skb = dn_wait_for_connect(sk, &timeo);
1087 if (IS_ERR(skb)) {
1088 release_sock(sk);
1089 return PTR_ERR(skb);
1090 }
1091 }
1092
1093 cb = DN_SKB_CB(skb);
1094 sk->sk_ack_backlog--;
1095 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1096 if (newsk == NULL) {
1097 release_sock(sk);
1098 kfree_skb(skb);
1099 return -ENOBUFS;
1100 }
1101 release_sock(sk);
1102
1103 dst = skb_dst(skb);
1104 sk_dst_set(newsk, dst);
1105 skb_dst_set(skb, NULL);
1106
1107 DN_SK(newsk)->state = DN_CR;
1108 DN_SK(newsk)->addrrem = cb->src_port;
1109 DN_SK(newsk)->services_rem = cb->services;
1110 DN_SK(newsk)->info_rem = cb->info;
1111 DN_SK(newsk)->segsize_rem = cb->segsize;
1112 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1113
1114 if (DN_SK(newsk)->segsize_rem < 230)
1115 DN_SK(newsk)->segsize_rem = 230;
1116
1117 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1118 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1119
1120 newsk->sk_state = TCP_LISTEN;
1121 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1122
1123 /*
1124 * If we are listening on a wild socket, we don't want
1125 * the newly created socket on the wrong hash queue.
1126 */
1127 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1128
1129 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1130 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1131 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1132 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1133
1134 menuver = *skb->data;
1135 skb_pull(skb, 1);
1136
1137 if (menuver & DN_MENUVER_ACC)
1138 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1139
1140 if (menuver & DN_MENUVER_USR)
1141 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1142
1143 if (menuver & DN_MENUVER_PRX)
1144 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1145
1146 if (menuver & DN_MENUVER_UIC)
1147 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1148
1149 kfree_skb(skb);
1150
1151 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1152 sizeof(struct optdata_dn));
1153 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1154 sizeof(struct optdata_dn));
1155
1156 lock_sock(newsk);
1157 err = dn_hash_sock(newsk);
1158 if (err == 0) {
1159 sock_reset_flag(newsk, SOCK_ZAPPED);
1160 dn_send_conn_ack(newsk);
1161
1162 /*
1163 * Here we use sk->sk_allocation since although the conn conf is
1164 * for the newsk, the context is the old socket.
1165 */
1166 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1167 err = dn_confirm_accept(newsk, &timeo,
1168 sk->sk_allocation);
1169 }
1170 release_sock(newsk);
1171 return err;
1172}
1173
1174
1175static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int peer)
1176{
1177 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1178 struct sock *sk = sock->sk;
1179 struct dn_scp *scp = DN_SK(sk);
1180
1181 lock_sock(sk);
1182
1183 if (peer) {
1184 if ((sock->state != SS_CONNECTED &&
1185 sock->state != SS_CONNECTING) &&
1186 scp->accept_mode == ACC_IMMED) {
1187 release_sock(sk);
1188 return -ENOTCONN;
1189 }
1190
1191 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1192 } else {
1193 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1194 }
1195
1196 release_sock(sk);
1197
1198 return sizeof(struct sockaddr_dn);
1199}
1200
1201
1202static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1203{
1204 struct sock *sk = sock->sk;
1205 struct dn_scp *scp = DN_SK(sk);
1206 __poll_t mask = datagram_poll(file, sock, wait);
1207
1208 if (!skb_queue_empty_lockless(&scp->other_receive_queue))
1209 mask |= EPOLLRDBAND;
1210
1211 return mask;
1212}
1213
1214static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1215{
1216 struct sock *sk = sock->sk;
1217 struct dn_scp *scp = DN_SK(sk);
1218 int err = -EOPNOTSUPP;
1219 long amount = 0;
1220 struct sk_buff *skb;
1221 int val;
1222
1223 switch(cmd)
1224 {
1225 case SIOCGIFADDR:
1226 case SIOCSIFADDR:
1227 return dn_dev_ioctl(cmd, (void __user *)arg);
1228
1229 case SIOCATMARK:
1230 lock_sock(sk);
1231 val = !skb_queue_empty(&scp->other_receive_queue);
1232 if (scp->state != DN_RUN)
1233 val = -ENOTCONN;
1234 release_sock(sk);
1235 return val;
1236
1237 case TIOCOUTQ:
1238 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1239 if (amount < 0)
1240 amount = 0;
1241 err = put_user(amount, (int __user *)arg);
1242 break;
1243
1244 case TIOCINQ:
1245 lock_sock(sk);
1246 skb = skb_peek(&scp->other_receive_queue);
1247 if (skb) {
1248 amount = skb->len;
1249 } else {
1250 skb_queue_walk(&sk->sk_receive_queue, skb)
1251 amount += skb->len;
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
1265static 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
1284out:
1285 release_sock(sk);
1286
1287 return err;
1288}
1289
1290
1291static 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 != SHUT_RDWR)
1311 goto out;
1312
1313 sk->sk_shutdown = SHUTDOWN_MASK;
1314 dn_destroy_sock(sk);
1315 err = 0;
1316
1317out:
1318 release_sock(sk);
1319
1320 return err;
1321}
1322
1323static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned 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#ifdef CONFIG_NETFILTER
1332 /* we need to exclude all possible ENOPROTOOPTs except default case */
1333 if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
1334 optname != DSO_STREAM && optname != DSO_SEQPACKET)
1335 err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1336#endif
1337
1338 return err;
1339}
1340
1341static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1342{
1343 struct sock *sk = sock->sk;
1344 struct dn_scp *scp = DN_SK(sk);
1345 long timeo;
1346 union {
1347 struct optdata_dn opt;
1348 struct accessdata_dn acc;
1349 int mode;
1350 unsigned long win;
1351 int val;
1352 unsigned char services;
1353 unsigned char info;
1354 } u;
1355 int err;
1356
1357 if (optlen && !optval)
1358 return -EINVAL;
1359
1360 if (optlen > sizeof(u))
1361 return -EINVAL;
1362
1363 if (copy_from_user(&u, optval, optlen))
1364 return -EFAULT;
1365
1366 switch (optname) {
1367 case DSO_CONDATA:
1368 if (sock->state == SS_CONNECTED)
1369 return -EISCONN;
1370 if ((scp->state != DN_O) && (scp->state != DN_CR))
1371 return -EINVAL;
1372
1373 if (optlen != sizeof(struct optdata_dn))
1374 return -EINVAL;
1375
1376 if (le16_to_cpu(u.opt.opt_optl) > 16)
1377 return -EINVAL;
1378
1379 memcpy(&scp->conndata_out, &u.opt, optlen);
1380 break;
1381
1382 case DSO_DISDATA:
1383 if (sock->state != SS_CONNECTED &&
1384 scp->accept_mode == ACC_IMMED)
1385 return -ENOTCONN;
1386
1387 if (optlen != sizeof(struct optdata_dn))
1388 return -EINVAL;
1389
1390 if (le16_to_cpu(u.opt.opt_optl) > 16)
1391 return -EINVAL;
1392
1393 memcpy(&scp->discdata_out, &u.opt, optlen);
1394 break;
1395
1396 case DSO_CONACCESS:
1397 if (sock->state == SS_CONNECTED)
1398 return -EISCONN;
1399 if (scp->state != DN_O)
1400 return -EINVAL;
1401
1402 if (optlen != sizeof(struct accessdata_dn))
1403 return -EINVAL;
1404
1405 if ((u.acc.acc_accl > DN_MAXACCL) ||
1406 (u.acc.acc_passl > DN_MAXACCL) ||
1407 (u.acc.acc_userl > DN_MAXACCL))
1408 return -EINVAL;
1409
1410 memcpy(&scp->accessdata, &u.acc, optlen);
1411 break;
1412
1413 case DSO_ACCEPTMODE:
1414 if (sock->state == SS_CONNECTED)
1415 return -EISCONN;
1416 if (scp->state != DN_O)
1417 return -EINVAL;
1418
1419 if (optlen != sizeof(int))
1420 return -EINVAL;
1421
1422 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1423 return -EINVAL;
1424
1425 scp->accept_mode = (unsigned char)u.mode;
1426 break;
1427
1428 case DSO_CONACCEPT:
1429 if (scp->state != DN_CR)
1430 return -EINVAL;
1431 timeo = sock_rcvtimeo(sk, 0);
1432 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1433 return err;
1434
1435 case DSO_CONREJECT:
1436 if (scp->state != DN_CR)
1437 return -EINVAL;
1438
1439 scp->state = DN_DR;
1440 sk->sk_shutdown = SHUTDOWN_MASK;
1441 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1442 break;
1443
1444 case DSO_MAXWINDOW:
1445 if (optlen != sizeof(unsigned long))
1446 return -EINVAL;
1447 if (u.win > NSP_MAX_WINDOW)
1448 u.win = NSP_MAX_WINDOW;
1449 if (u.win == 0)
1450 return -EINVAL;
1451 scp->max_window = u.win;
1452 if (scp->snd_window > u.win)
1453 scp->snd_window = u.win;
1454 break;
1455
1456 case DSO_NODELAY:
1457 if (optlen != sizeof(int))
1458 return -EINVAL;
1459 if (scp->nonagle == TCP_NAGLE_CORK)
1460 return -EINVAL;
1461 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1462 /* if (scp->nonagle == 1) { Push pending frames } */
1463 break;
1464
1465 case DSO_CORK:
1466 if (optlen != sizeof(int))
1467 return -EINVAL;
1468 if (scp->nonagle == TCP_NAGLE_OFF)
1469 return -EINVAL;
1470 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1471 /* if (scp->nonagle == 0) { Push pending frames } */
1472 break;
1473
1474 case DSO_SERVICES:
1475 if (optlen != sizeof(unsigned char))
1476 return -EINVAL;
1477 if ((u.services & ~NSP_FC_MASK) != 0x01)
1478 return -EINVAL;
1479 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1480 return -EINVAL;
1481 scp->services_loc = u.services;
1482 break;
1483
1484 case DSO_INFO:
1485 if (optlen != sizeof(unsigned char))
1486 return -EINVAL;
1487 if (u.info & 0xfc)
1488 return -EINVAL;
1489 scp->info_loc = u.info;
1490 break;
1491
1492 case DSO_LINKINFO:
1493 case DSO_STREAM:
1494 case DSO_SEQPACKET:
1495 default:
1496 return -ENOPROTOOPT;
1497 }
1498
1499 return 0;
1500}
1501
1502static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1503{
1504 struct sock *sk = sock->sk;
1505 int err;
1506
1507 lock_sock(sk);
1508 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1509 release_sock(sk);
1510#ifdef CONFIG_NETFILTER
1511 if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
1512 optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
1513 optname != DSO_CONREJECT) {
1514 int len;
1515
1516 if (get_user(len, optlen))
1517 return -EFAULT;
1518
1519 err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1520 if (err >= 0)
1521 err = put_user(len, optlen);
1522 }
1523#endif
1524
1525 return err;
1526}
1527
1528static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1529{
1530 struct sock *sk = sock->sk;
1531 struct dn_scp *scp = DN_SK(sk);
1532 struct linkinfo_dn link;
1533 unsigned int r_len;
1534 void *r_data = NULL;
1535 unsigned int val;
1536
1537 if(get_user(r_len , optlen))
1538 return -EFAULT;
1539
1540 switch (optname) {
1541 case DSO_CONDATA:
1542 if (r_len > sizeof(struct optdata_dn))
1543 r_len = sizeof(struct optdata_dn);
1544 r_data = &scp->conndata_in;
1545 break;
1546
1547 case DSO_DISDATA:
1548 if (r_len > sizeof(struct optdata_dn))
1549 r_len = sizeof(struct optdata_dn);
1550 r_data = &scp->discdata_in;
1551 break;
1552
1553 case DSO_CONACCESS:
1554 if (r_len > sizeof(struct accessdata_dn))
1555 r_len = sizeof(struct accessdata_dn);
1556 r_data = &scp->accessdata;
1557 break;
1558
1559 case DSO_ACCEPTMODE:
1560 if (r_len > sizeof(unsigned char))
1561 r_len = sizeof(unsigned char);
1562 r_data = &scp->accept_mode;
1563 break;
1564
1565 case DSO_LINKINFO:
1566 if (r_len > sizeof(struct linkinfo_dn))
1567 r_len = sizeof(struct linkinfo_dn);
1568
1569 memset(&link, 0, sizeof(link));
1570
1571 switch (sock->state) {
1572 case SS_CONNECTING:
1573 link.idn_linkstate = LL_CONNECTING;
1574 break;
1575 case SS_DISCONNECTING:
1576 link.idn_linkstate = LL_DISCONNECTING;
1577 break;
1578 case SS_CONNECTED:
1579 link.idn_linkstate = LL_RUNNING;
1580 break;
1581 default:
1582 link.idn_linkstate = LL_INACTIVE;
1583 }
1584
1585 link.idn_segsize = scp->segsize_rem;
1586 r_data = &link;
1587 break;
1588
1589 case DSO_MAXWINDOW:
1590 if (r_len > sizeof(unsigned long))
1591 r_len = sizeof(unsigned long);
1592 r_data = &scp->max_window;
1593 break;
1594
1595 case DSO_NODELAY:
1596 if (r_len > sizeof(int))
1597 r_len = sizeof(int);
1598 val = (scp->nonagle == TCP_NAGLE_OFF);
1599 r_data = &val;
1600 break;
1601
1602 case DSO_CORK:
1603 if (r_len > sizeof(int))
1604 r_len = sizeof(int);
1605 val = (scp->nonagle == TCP_NAGLE_CORK);
1606 r_data = &val;
1607 break;
1608
1609 case DSO_SERVICES:
1610 if (r_len > sizeof(unsigned char))
1611 r_len = sizeof(unsigned char);
1612 r_data = &scp->services_rem;
1613 break;
1614
1615 case DSO_INFO:
1616 if (r_len > sizeof(unsigned char))
1617 r_len = sizeof(unsigned char);
1618 r_data = &scp->info_rem;
1619 break;
1620
1621 case DSO_STREAM:
1622 case DSO_SEQPACKET:
1623 case DSO_CONACCEPT:
1624 case DSO_CONREJECT:
1625 default:
1626 return -ENOPROTOOPT;
1627 }
1628
1629 if (r_data) {
1630 if (copy_to_user(optval, r_data, r_len))
1631 return -EFAULT;
1632 if (put_user(r_len, optlen))
1633 return -EFAULT;
1634 }
1635
1636 return 0;
1637}
1638
1639
1640static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1641{
1642 struct sk_buff *skb;
1643 int len = 0;
1644
1645 if (flags & MSG_OOB)
1646 return !skb_queue_empty(q) ? 1 : 0;
1647
1648 skb_queue_walk(q, skb) {
1649 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1650 len += skb->len;
1651
1652 if (cb->nsp_flags & 0x40) {
1653 /* SOCK_SEQPACKET reads to EOM */
1654 if (sk->sk_type == SOCK_SEQPACKET)
1655 return 1;
1656 /* so does SOCK_STREAM unless WAITALL is specified */
1657 if (!(flags & MSG_WAITALL))
1658 return 1;
1659 }
1660
1661 /* minimum data length for read exceeded */
1662 if (len >= target)
1663 return 1;
1664 }
1665
1666 return 0;
1667}
1668
1669
1670static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1671 int flags)
1672{
1673 struct sock *sk = sock->sk;
1674 struct dn_scp *scp = DN_SK(sk);
1675 struct sk_buff_head *queue = &sk->sk_receive_queue;
1676 size_t target = size > 1 ? 1 : 0;
1677 size_t copied = 0;
1678 int rv = 0;
1679 struct sk_buff *skb, *n;
1680 struct dn_skb_cb *cb = NULL;
1681 unsigned char eor = 0;
1682 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1683
1684 lock_sock(sk);
1685
1686 if (sock_flag(sk, SOCK_ZAPPED)) {
1687 rv = -EADDRNOTAVAIL;
1688 goto out;
1689 }
1690
1691 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1692 rv = 0;
1693 goto out;
1694 }
1695
1696 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1697 if (rv)
1698 goto out;
1699
1700 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1701 rv = -EOPNOTSUPP;
1702 goto out;
1703 }
1704
1705 if (flags & MSG_OOB)
1706 queue = &scp->other_receive_queue;
1707
1708 if (flags & MSG_WAITALL)
1709 target = size;
1710
1711
1712 /*
1713 * See if there is data ready to read, sleep if there isn't
1714 */
1715 for(;;) {
1716 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1717
1718 if (sk->sk_err)
1719 goto out;
1720
1721 if (!skb_queue_empty(&scp->other_receive_queue)) {
1722 if (!(flags & MSG_OOB)) {
1723 msg->msg_flags |= MSG_OOB;
1724 if (!scp->other_report) {
1725 scp->other_report = 1;
1726 goto out;
1727 }
1728 }
1729 }
1730
1731 if (scp->state != DN_RUN)
1732 goto out;
1733
1734 if (signal_pending(current)) {
1735 rv = sock_intr_errno(timeo);
1736 goto out;
1737 }
1738
1739 if (dn_data_ready(sk, queue, flags, target))
1740 break;
1741
1742 if (flags & MSG_DONTWAIT) {
1743 rv = -EWOULDBLOCK;
1744 goto out;
1745 }
1746
1747 add_wait_queue(sk_sleep(sk), &wait);
1748 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1749 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1750 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1751 remove_wait_queue(sk_sleep(sk), &wait);
1752 }
1753
1754 skb_queue_walk_safe(queue, skb, n) {
1755 unsigned int chunk = skb->len;
1756 cb = DN_SKB_CB(skb);
1757
1758 if ((chunk + copied) > size)
1759 chunk = size - copied;
1760
1761 if (memcpy_to_msg(msg, skb->data, chunk)) {
1762 rv = -EFAULT;
1763 break;
1764 }
1765 copied += chunk;
1766
1767 if (!(flags & MSG_PEEK))
1768 skb_pull(skb, chunk);
1769
1770 eor = cb->nsp_flags & 0x40;
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
1805out:
1806 if (rv == 0)
1807 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1808
1809 if ((rv >= 0) && msg->msg_name) {
1810 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1811 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1812 msg->msg_namelen = sizeof(struct sockaddr_dn);
1813 }
1814
1815 release_sock(sk);
1816
1817 return rv;
1818}
1819
1820
1821static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1822{
1823 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1824 if (skb_queue_len(queue) >= scp->snd_window)
1825 return 1;
1826 if (fctype != NSP_FC_NONE) {
1827 if (flags & MSG_OOB) {
1828 if (scp->flowrem_oth == 0)
1829 return 1;
1830 } else {
1831 if (scp->flowrem_dat == 0)
1832 return 1;
1833 }
1834 }
1835 return 0;
1836}
1837
1838/*
1839 * The DECnet spec requires that the "routing layer" accepts packets which
1840 * are at least 230 bytes in size. This excludes any headers which the NSP
1841 * layer might add, so we always assume that we'll be using the maximal
1842 * length header on data packets. The variation in length is due to the
1843 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1844 * make much practical difference.
1845 */
1846unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1847{
1848 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1849 if (dev) {
1850 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1851 mtu -= LL_RESERVED_SPACE(dev);
1852 if (dn_db->use_long)
1853 mtu -= 21;
1854 else
1855 mtu -= 6;
1856 mtu -= DN_MAX_NSP_DATA_HEADER;
1857 } else {
1858 /*
1859 * 21 = long header, 16 = guess at MAC header length
1860 */
1861 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1862 }
1863 if (mtu > mss)
1864 mss = mtu;
1865 return mss;
1866}
1867
1868static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1869{
1870 struct dst_entry *dst = __sk_dst_get(sk);
1871 struct dn_scp *scp = DN_SK(sk);
1872 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1873
1874 /* Other data messages are limited to 16 bytes per packet */
1875 if (flags & MSG_OOB)
1876 return 16;
1877
1878 /* This works out the maximum size of segment we can send out */
1879 if (dst) {
1880 u32 mtu = dst_mtu(dst);
1881 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1882 }
1883
1884 return mss_now;
1885}
1886
1887/*
1888 * N.B. We get the timeout wrong here, but then we always did get it
1889 * wrong before and this is another step along the road to correcting
1890 * it. It ought to get updated each time we pass through the routine,
1891 * but in practise it probably doesn't matter too much for now.
1892 */
1893static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1894 unsigned long datalen, int noblock,
1895 int *errcode)
1896{
1897 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1898 noblock, errcode);
1899 if (skb) {
1900 skb->protocol = htons(ETH_P_DNA_RT);
1901 skb->pkt_type = PACKET_OUTGOING;
1902 }
1903 return skb;
1904}
1905
1906static int dn_sendmsg(struct socket *sock, 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 DECLARE_SOCKADDR(struct sockaddr_dn *, addr, 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);
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 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1998
1999 if (flags & MSG_DONTWAIT) {
2000 err = -EWOULDBLOCK;
2001 goto out;
2002 }
2003
2004 add_wait_queue(sk_sleep(sk), &wait);
2005 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2006 sk_wait_event(sk, &timeo,
2007 !dn_queue_too_long(scp, queue, flags), &wait);
2008 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2009 remove_wait_queue(sk_sleep(sk), &wait);
2010 continue;
2011 }
2012
2013 /*
2014 * Get a suitably sized skb.
2015 * 64 is a bit of a hack really, but its larger than any
2016 * link-layer headers and has served us well as a good
2017 * guess as to their real length.
2018 */
2019 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2020 flags & MSG_DONTWAIT, &err);
2021
2022 if (err)
2023 break;
2024
2025 if (!skb)
2026 continue;
2027
2028 cb = DN_SKB_CB(skb);
2029
2030 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2031
2032 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2033 err = -EFAULT;
2034 goto out;
2035 }
2036
2037 if (flags & MSG_OOB) {
2038 cb->nsp_flags = 0x30;
2039 if (fctype != NSP_FC_NONE)
2040 scp->flowrem_oth--;
2041 } else {
2042 cb->nsp_flags = 0x00;
2043 if (scp->seg_total == 0)
2044 cb->nsp_flags |= 0x20;
2045
2046 scp->seg_total += len;
2047
2048 if (((sent + len) == size) && (flags & MSG_EOR)) {
2049 cb->nsp_flags |= 0x40;
2050 scp->seg_total = 0;
2051 if (fctype == NSP_FC_SCMC)
2052 scp->flowrem_dat--;
2053 }
2054 if (fctype == NSP_FC_SRC)
2055 scp->flowrem_dat--;
2056 }
2057
2058 sent += len;
2059 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2060 skb = NULL;
2061
2062 scp->persist = dn_nsp_persist(sk);
2063
2064 }
2065out:
2066
2067 kfree_skb(skb);
2068
2069 release_sock(sk);
2070
2071 return sent ? sent : err;
2072
2073out_err:
2074 err = sk_stream_error(sk, flags, err);
2075 release_sock(sk);
2076 return err;
2077}
2078
2079static int dn_device_event(struct notifier_block *this, unsigned long event,
2080 void *ptr)
2081{
2082 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2083
2084 if (!net_eq(dev_net(dev), &init_net))
2085 return NOTIFY_DONE;
2086
2087 switch (event) {
2088 case NETDEV_UP:
2089 dn_dev_up(dev);
2090 break;
2091 case NETDEV_DOWN:
2092 dn_dev_down(dev);
2093 break;
2094 default:
2095 break;
2096 }
2097
2098 return NOTIFY_DONE;
2099}
2100
2101static struct notifier_block dn_dev_notifier = {
2102 .notifier_call = dn_device_event,
2103};
2104
2105static struct packet_type dn_dix_packet_type __read_mostly = {
2106 .type = cpu_to_be16(ETH_P_DNA_RT),
2107 .func = dn_route_rcv,
2108};
2109
2110#ifdef CONFIG_PROC_FS
2111struct dn_iter_state {
2112 int bucket;
2113};
2114
2115static 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
2131static 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);
2137try_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;
2144out:
2145 return n;
2146}
2147
2148static 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
2159static 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
2170static 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
2175static 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);
2188out:
2189 ++*pos;
2190 return rc;
2191}
2192
2193static 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
2201static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2202{
2203 int i;
2204
2205 switch (le16_to_cpu(dn->sdn_objnamel)) {
2206 case 0:
2207 sprintf(buf, "%d", dn->sdn_objnum);
2208 break;
2209 default:
2210 for (i = 0; i < le16_to_cpu(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
2219static 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
2259static 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(le16_to_cpu(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(le16_to_cpu(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
2293static 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
2303static const 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#endif
2310
2311static const struct net_proto_family dn_family_ops = {
2312 .family = AF_DECnet,
2313 .create = dn_create,
2314 .owner = THIS_MODULE,
2315};
2316
2317static const struct proto_ops dn_proto_ops = {
2318 .family = AF_DECnet,
2319 .owner = THIS_MODULE,
2320 .release = dn_release,
2321 .bind = dn_bind,
2322 .connect = dn_connect,
2323 .socketpair = sock_no_socketpair,
2324 .accept = dn_accept,
2325 .getname = dn_getname,
2326 .poll = dn_poll,
2327 .ioctl = dn_ioctl,
2328 .listen = dn_listen,
2329 .shutdown = dn_shutdown,
2330 .setsockopt = dn_setsockopt,
2331 .getsockopt = dn_getsockopt,
2332 .sendmsg = dn_sendmsg,
2333 .recvmsg = dn_recvmsg,
2334 .mmap = sock_no_mmap,
2335 .sendpage = sock_no_sendpage,
2336};
2337
2338MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2339MODULE_AUTHOR("Linux DECnet Project Team");
2340MODULE_LICENSE("GPL");
2341MODULE_ALIAS_NETPROTO(PF_DECnet);
2342
2343static const char banner[] __initconst = KERN_INFO
2344"NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2345
2346static int __init decnet_init(void)
2347{
2348 int rc;
2349
2350 printk(banner);
2351
2352 rc = proto_register(&dn_proto, 1);
2353 if (rc != 0)
2354 goto out;
2355
2356 dn_neigh_init();
2357 dn_dev_init();
2358 dn_route_init();
2359 dn_fib_init();
2360
2361 sock_register(&dn_family_ops);
2362 dev_add_pack(&dn_dix_packet_type);
2363 register_netdevice_notifier(&dn_dev_notifier);
2364
2365 proc_create_seq_private("decnet", 0444, init_net.proc_net,
2366 &dn_socket_seq_ops, sizeof(struct dn_iter_state),
2367 NULL);
2368 dn_register_sysctl();
2369out:
2370 return rc;
2371
2372}
2373module_init(decnet_init);
2374
2375/*
2376 * Prevent DECnet module unloading until its fixed properly.
2377 * Requires an audit of the code to check for memory leaks and
2378 * initialisation problems etc.
2379 */
2380#if 0
2381static void __exit decnet_exit(void)
2382{
2383 sock_unregister(AF_DECnet);
2384 rtnl_unregister_all(PF_DECnet);
2385 dev_remove_pack(&dn_dix_packet_type);
2386
2387 dn_unregister_sysctl();
2388
2389 unregister_netdevice_notifier(&dn_dev_notifier);
2390
2391 dn_route_cleanup();
2392 dn_dev_cleanup();
2393 dn_neigh_cleanup();
2394 dn_fib_cleanup();
2395
2396 remove_proc_entry("decnet", init_net.proc_net);
2397
2398 proto_unregister(&dn_proto);
2399
2400 rcu_barrier(); /* Wait for completion of call_rcu()'s */
2401}
2402module_exit(decnet_exit);
2403#endif