1
2 /*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Socket Layer Interface
8 *
9 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
10 * Patrick Caulfield <patrick@pandh.demon.co.uk>
11 *
12 * Changes:
13 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
14 * version of the code. Original copyright preserved
15 * below.
16 * Steve Whitehouse: Some bug fixes, cleaning up some code to make it
17 * compatible with my routing layer.
18 * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
19 * Caulfield.
20 * Steve Whitehouse: Further bug fixes, checking module code still works
21 * with new routing layer.
22 * Steve Whitehouse: Additional set/get_sockopt() calls.
23 * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
24 * code.
25 * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
26 * way. Didn't manage it entirely, but its better.
27 * Steve Whitehouse: ditto for sendmsg().
28 * Steve Whitehouse: A selection of bug fixes to various things.
29 * Steve Whitehouse: Added TIOCOUTQ ioctl.
30 * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
31 * Steve Whitehouse: Fixes to connect() error returns.
32 * Patrick Caulfield: Fixes to delayed acceptance logic.
33 * David S. Miller: New socket locking
34 * Steve Whitehouse: Socket list hashing/locking
35 * Arnaldo C. Melo: use capable, not suser
36 * Steve Whitehouse: Removed unused code. Fix to use sk->allocation
37 * when required.
38 * Patrick Caulfield: /proc/net/decnet now has object name/number
39 * Steve Whitehouse: Fixed local port allocation, hashed sk list
40 * Matthew Wilcox: Fixes for dn_ioctl()
41 * Steve Whitehouse: New connect/accept logic to allow timeouts and
42 * prepare for sendpage etc.
43 */
44
45
46 /******************************************************************************
47 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
48
49 This program is free software; you can redistribute it and/or modify
50 it under the terms of the GNU General Public License as published by
51 the Free Software Foundation; either version 2 of the License, or
52 any later version.
53
54 This program is distributed in the hope that it will be useful,
55 but WITHOUT ANY WARRANTY; without even the implied warranty of
56 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
57 GNU General Public License for more details.
58
59 HISTORY:
60
61 Version Kernel Date Author/Comments
62 ------- ------ ---- ---------------
63 Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
64 (emserrat@geocities.com)
65
66 First Development of DECnet Socket La-
67 yer for Linux. Only supports outgoing
68 connections.
69
70 Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
71 (patrick@pandh.demon.co.uk)
72
73 Port to new kernel development version.
74
75 Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
76 (emserrat@geocities.com)
77 _
78 Added support for incoming connections
79 so we can start developing server apps
80 on Linux.
81 -
82 Module Support
83 Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
84 (emserrat@geocities.com)
85 _
86 Added support for X11R6.4. Now we can
87 use DECnet transport for X on Linux!!!
88 -
89 Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
90 (emserrat@geocities.com)
91 Removed bugs on flow control
92 Removed bugs on incoming accessdata
93 order
94 -
95 Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
96 dn_recvmsg fixes
97
98 Patrick J. Caulfield
99 dn_bind fixes
100 *******************************************************************************/
101
102 #include <linux/module.h>
103 #include <linux/errno.h>
104 #include <linux/types.h>
105 #include <linux/slab.h>
106 #include <linux/socket.h>
107 #include <linux/in.h>
108 #include <linux/kernel.h>
109 #include <linux/sched/signal.h>
110 #include <linux/timer.h>
111 #include <linux/string.h>
112 #include <linux/sockios.h>
113 #include <linux/net.h>
114 #include <linux/netdevice.h>
115 #include <linux/inet.h>
116 #include <linux/route.h>
117 #include <linux/netfilter.h>
118 #include <linux/seq_file.h>
119 #include <net/sock.h>
120 #include <net/tcp_states.h>
121 #include <net/flow.h>
122 #include <asm/ioctls.h>
123 #include <linux/capability.h>
124 #include <linux/mm.h>
125 #include <linux/interrupt.h>
126 #include <linux/proc_fs.h>
127 #include <linux/stat.h>
128 #include <linux/init.h>
129 #include <linux/poll.h>
130 #include <linux/jiffies.h>
131 #include <net/net_namespace.h>
132 #include <net/neighbour.h>
133 #include <net/dst.h>
134 #include <net/fib_rules.h>
135 #include <net/tcp.h>
136 #include <net/dn.h>
137 #include <net/dn_nsp.h>
138 #include <net/dn_dev.h>
139 #include <net/dn_route.h>
140 #include <net/dn_fib.h>
141 #include <net/dn_neigh.h>
142
143 struct dn_sock {
144 struct sock sk;
145 struct dn_scp scp;
146 };
147
148 static void dn_keepalive(struct sock *sk);
149
150 #define DN_SK_HASH_SHIFT 8
151 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
152 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
153
154
155 static const struct proto_ops dn_proto_ops;
156 static DEFINE_RWLOCK(dn_hash_lock);
157 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
158 static struct hlist_head dn_wild_sk;
159 static atomic_long_t decnet_memory_allocated;
160
161 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
162 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
163
164 static struct hlist_head *dn_find_list(struct sock *sk)
165 {
166 struct dn_scp *scp = DN_SK(sk);
167
168 if (scp->addr.sdn_flags & SDF_WILD)
169 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
170
171 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
172 }
173
174 /*
175 * Valid ports are those greater than zero and not already in use.
176 */
177 static int check_port(__le16 port)
178 {
179 struct sock *sk;
180
181 if (port == 0)
182 return -1;
183
184 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
185 struct dn_scp *scp = DN_SK(sk);
186 if (scp->addrloc == port)
187 return -1;
188 }
189 return 0;
190 }
191
192 static unsigned short port_alloc(struct sock *sk)
193 {
194 struct dn_scp *scp = DN_SK(sk);
195 static unsigned short port = 0x2000;
196 unsigned short i_port = port;
197
198 while(check_port(cpu_to_le16(++port)) != 0) {
199 if (port == i_port)
200 return 0;
201 }
202
203 scp->addrloc = cpu_to_le16(port);
204
205 return 1;
206 }
207
208 /*
209 * Since this is only ever called from user
210 * level, we don't need a write_lock() version
211 * of this.
212 */
213 static int dn_hash_sock(struct sock *sk)
214 {
215 struct dn_scp *scp = DN_SK(sk);
216 struct hlist_head *list;
217 int rv = -EUSERS;
218
219 BUG_ON(sk_hashed(sk));
220
221 write_lock_bh(&dn_hash_lock);
222
223 if (!scp->addrloc && !port_alloc(sk))
224 goto out;
225
226 rv = -EADDRINUSE;
227 if ((list = dn_find_list(sk)) == NULL)
228 goto out;
229
230 sk_add_node(sk, list);
231 rv = 0;
232 out:
233 write_unlock_bh(&dn_hash_lock);
234 return rv;
235 }
236
237 static void dn_unhash_sock(struct sock *sk)
238 {
239 write_lock(&dn_hash_lock);
240 sk_del_node_init(sk);
241 write_unlock(&dn_hash_lock);
242 }
243
244 static void dn_unhash_sock_bh(struct sock *sk)
245 {
246 write_lock_bh(&dn_hash_lock);
247 sk_del_node_init(sk);
248 write_unlock_bh(&dn_hash_lock);
249 }
250
251 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
252 {
253 int i;
254 unsigned int hash = addr->sdn_objnum;
255
256 if (hash == 0) {
257 hash = addr->sdn_objnamel;
258 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
259 hash ^= addr->sdn_objname[i];
260 hash ^= (hash << 3);
261 }
262 }
263
264 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
265 }
266
267 /*
268 * Called to transform a socket from bound (i.e. with a local address)
269 * into a listening socket (doesn't need a local port number) and rehashes
270 * based upon the object name/number.
271 */
272 static void dn_rehash_sock(struct sock *sk)
273 {
274 struct hlist_head *list;
275 struct dn_scp *scp = DN_SK(sk);
276
277 if (scp->addr.sdn_flags & SDF_WILD)
278 return;
279
280 write_lock_bh(&dn_hash_lock);
281 sk_del_node_init(sk);
282 DN_SK(sk)->addrloc = 0;
283 list = listen_hash(&DN_SK(sk)->addr);
284 sk_add_node(sk, list);
285 write_unlock_bh(&dn_hash_lock);
286 }
287
288 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
289 {
290 int len = 2;
291
292 *buf++ = type;
293
294 switch (type) {
295 case 0:
296 *buf++ = sdn->sdn_objnum;
297 break;
298 case 1:
299 *buf++ = 0;
300 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
301 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
302 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
303 break;
304 case 2:
305 memset(buf, 0, 5);
306 buf += 5;
307 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
308 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
309 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
310 break;
311 }
312
313 return len;
314 }
315
316 /*
317 * On reception of usernames, we handle types 1 and 0 for destination
318 * addresses only. Types 2 and 4 are used for source addresses, but the
319 * UIC, GIC are ignored and they are both treated the same way. Type 3
320 * is never used as I've no idea what its purpose might be or what its
321 * format is.
322 */
323 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
324 {
325 unsigned char type;
326 int size = len;
327 int namel = 12;
328
329 sdn->sdn_objnum = 0;
330 sdn->sdn_objnamel = cpu_to_le16(0);
331 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
332
333 if (len < 2)
334 return -1;
335
336 len -= 2;
337 *fmt = *data++;
338 type = *data++;
339
340 switch (*fmt) {
341 case 0:
342 sdn->sdn_objnum = type;
343 return 2;
344 case 1:
345 namel = 16;
346 break;
347 case 2:
348 len -= 4;
349 data += 4;
350 break;
351 case 4:
352 len -= 8;
353 data += 8;
354 break;
355 default:
356 return -1;
357 }
358
359 len -= 1;
360
361 if (len < 0)
362 return -1;
363
364 sdn->sdn_objnamel = cpu_to_le16(*data++);
365 len -= le16_to_cpu(sdn->sdn_objnamel);
366
367 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
368 return -1;
369
370 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
371
372 return size - len;
373 }
374
375 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
376 {
377 struct hlist_head *list = listen_hash(addr);
378 struct sock *sk;
379
380 read_lock(&dn_hash_lock);
381 sk_for_each(sk, list) {
382 struct dn_scp *scp = DN_SK(sk);
383 if (sk->sk_state != TCP_LISTEN)
384 continue;
385 if (scp->addr.sdn_objnum) {
386 if (scp->addr.sdn_objnum != addr->sdn_objnum)
387 continue;
388 } else {
389 if (addr->sdn_objnum)
390 continue;
391 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
392 continue;
393 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
394 continue;
395 }
396 sock_hold(sk);
397 read_unlock(&dn_hash_lock);
398 return sk;
399 }
400
401 sk = sk_head(&dn_wild_sk);
402 if (sk) {
403 if (sk->sk_state == TCP_LISTEN)
404 sock_hold(sk);
405 else
406 sk = NULL;
407 }
408
409 read_unlock(&dn_hash_lock);
410 return sk;
411 }
412
413 struct sock *dn_find_by_skb(struct sk_buff *skb)
414 {
415 struct dn_skb_cb *cb = DN_SKB_CB(skb);
416 struct sock *sk;
417 struct dn_scp *scp;
418
419 read_lock(&dn_hash_lock);
420 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
421 scp = DN_SK(sk);
422 if (cb->src != dn_saddr2dn(&scp->peer))
423 continue;
424 if (cb->dst_port != scp->addrloc)
425 continue;
426 if (scp->addrrem && (cb->src_port != scp->addrrem))
427 continue;
428 sock_hold(sk);
429 goto found;
430 }
431 sk = NULL;
432 found:
433 read_unlock(&dn_hash_lock);
434 return sk;
435 }
436
437
438
439 static void dn_destruct(struct sock *sk)
440 {
441 struct dn_scp *scp = DN_SK(sk);
442
443 skb_queue_purge(&scp->data_xmit_queue);
444 skb_queue_purge(&scp->other_xmit_queue);
445 skb_queue_purge(&scp->other_receive_queue);
446
447 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
448 }
449
450 static unsigned long dn_memory_pressure;
451
452 static void dn_enter_memory_pressure(struct sock *sk)
453 {
454 if (!dn_memory_pressure) {
455 dn_memory_pressure = 1;
456 }
457 }
458
459 static struct proto dn_proto = {
460 .name = "NSP",
461 .owner = THIS_MODULE,
462 .enter_memory_pressure = dn_enter_memory_pressure,
463 .memory_pressure = &dn_memory_pressure,
464 .memory_allocated = &decnet_memory_allocated,
465 .sysctl_mem = sysctl_decnet_mem,
466 .sysctl_wmem = sysctl_decnet_wmem,
467 .sysctl_rmem = sysctl_decnet_rmem,
468 .max_header = DN_MAX_NSP_DATA_HEADER + 64,
469 .obj_size = sizeof(struct dn_sock),
470 };
471
472 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
473 {
474 struct dn_scp *scp;
475 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
476
477 if (!sk)
478 goto out;
479
480 if (sock)
481 sock->ops = &dn_proto_ops;
482 sock_init_data(sock, sk);
483
484 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
485 sk->sk_destruct = dn_destruct;
486 sk->sk_no_check_tx = 1;
487 sk->sk_family = PF_DECnet;
488 sk->sk_protocol = 0;
489 sk->sk_allocation = gfp;
490 sk->sk_sndbuf = sysctl_decnet_wmem[1];
491 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
492
493 /* Initialization of DECnet Session Control Port */
494 scp = DN_SK(sk);
495 scp->state = DN_O; /* Open */
496 scp->numdat = 1; /* Next data seg to tx */
497 scp->numoth = 1; /* Next oth data to tx */
498 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
499 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
500 scp->ackrcv_dat = 0; /* Highest data ack recv*/
501 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
502 scp->flowrem_sw = DN_SEND;
503 scp->flowloc_sw = DN_SEND;
504 scp->flowrem_dat = 0;
505 scp->flowrem_oth = 1;
506 scp->flowloc_dat = 0;
507 scp->flowloc_oth = 1;
508 scp->services_rem = 0;
509 scp->services_loc = 1 | NSP_FC_NONE;
510 scp->info_rem = 0;
511 scp->info_loc = 0x03; /* NSP version 4.1 */
512 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
513 scp->nonagle = 0;
514 scp->multi_ireq = 1;
515 scp->accept_mode = ACC_IMMED;
516 scp->addr.sdn_family = AF_DECnet;
517 scp->peer.sdn_family = AF_DECnet;
518 scp->accessdata.acc_accl = 5;
519 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
520
521 scp->max_window = NSP_MAX_WINDOW;
522 scp->snd_window = NSP_MIN_WINDOW;
523 scp->nsp_srtt = NSP_INITIAL_SRTT;
524 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
525 scp->nsp_rxtshift = 0;
526
527 skb_queue_head_init(&scp->data_xmit_queue);
528 skb_queue_head_init(&scp->other_xmit_queue);
529 skb_queue_head_init(&scp->other_receive_queue);
530
531 scp->persist = 0;
532 scp->persist_fxn = NULL;
533 scp->keepalive = 10 * HZ;
534 scp->keepalive_fxn = dn_keepalive;
535
536 dn_start_slow_timer(sk);
537 out:
538 return sk;
539 }
540
541 /*
542 * Keepalive timer.
543 * FIXME: Should respond to SO_KEEPALIVE etc.
544 */
545 static void dn_keepalive(struct sock *sk)
546 {
547 struct dn_scp *scp = DN_SK(sk);
548
549 /*
550 * By checking the other_data transmit queue is empty
551 * we are double checking that we are not sending too
552 * many of these keepalive frames.
553 */
554 if (skb_queue_empty(&scp->other_xmit_queue))
555 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
556 }
557
558
559 /*
560 * Timer for shutdown/destroyed sockets.
561 * When socket is dead & no packets have been sent for a
562 * certain amount of time, they are removed by this
563 * routine. Also takes care of sending out DI & DC
564 * frames at correct times.
565 */
566 int dn_destroy_timer(struct sock *sk)
567 {
568 struct dn_scp *scp = DN_SK(sk);
569
570 scp->persist = dn_nsp_persist(sk);
571
572 switch (scp->state) {
573 case DN_DI:
574 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
575 if (scp->nsp_rxtshift >= decnet_di_count)
576 scp->state = DN_CN;
577 return 0;
578
579 case DN_DR:
580 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
581 if (scp->nsp_rxtshift >= decnet_dr_count)
582 scp->state = DN_DRC;
583 return 0;
584
585 case DN_DN:
586 if (scp->nsp_rxtshift < decnet_dn_count) {
587 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
588 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
589 GFP_ATOMIC);
590 return 0;
591 }
592 }
593
594 scp->persist = (HZ * decnet_time_wait);
595
596 if (sk->sk_socket)
597 return 0;
598
599 if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
600 dn_unhash_sock(sk);
601 sock_put(sk);
602 return 1;
603 }
604
605 return 0;
606 }
607
608 static void dn_destroy_sock(struct sock *sk)
609 {
610 struct dn_scp *scp = DN_SK(sk);
611
612 scp->nsp_rxtshift = 0; /* reset back off */
613
614 if (sk->sk_socket) {
615 if (sk->sk_socket->state != SS_UNCONNECTED)
616 sk->sk_socket->state = SS_DISCONNECTING;
617 }
618
619 sk->sk_state = TCP_CLOSE;
620
621 switch (scp->state) {
622 case DN_DN:
623 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
624 sk->sk_allocation);
625 scp->persist_fxn = dn_destroy_timer;
626 scp->persist = dn_nsp_persist(sk);
627 break;
628 case DN_CR:
629 scp->state = DN_DR;
630 goto disc_reject;
631 case DN_RUN:
632 scp->state = DN_DI;
633 /* fall through */
634 case DN_DI:
635 case DN_DR:
636 disc_reject:
637 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
638 /* fall through */
639 case DN_NC:
640 case DN_NR:
641 case DN_RJ:
642 case DN_DIC:
643 case DN_CN:
644 case DN_DRC:
645 case DN_CI:
646 case DN_CD:
647 scp->persist_fxn = dn_destroy_timer;
648 scp->persist = dn_nsp_persist(sk);
649 break;
650 default:
651 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
652 /* fall through */
653 case DN_O:
654 dn_stop_slow_timer(sk);
655
656 dn_unhash_sock_bh(sk);
657 sock_put(sk);
658
659 break;
660 }
661 }
662
663 char *dn_addr2asc(__u16 addr, char *buf)
664 {
665 unsigned short node, area;
666
667 node = addr & 0x03ff;
668 area = addr >> 10;
669 sprintf(buf, "%hd.%hd", area, node);
670
671 return buf;
672 }
673
674
675
676 static int dn_create(struct net *net, struct socket *sock, int protocol,
677 int kern)
678 {
679 struct sock *sk;
680
681 if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
682 return -EINVAL;
683
684 if (!net_eq(net, &init_net))
685 return -EAFNOSUPPORT;
686
687 switch (sock->type) {
688 case SOCK_SEQPACKET:
689 if (protocol != DNPROTO_NSP)
690 return -EPROTONOSUPPORT;
691 break;
692 case SOCK_STREAM:
693 break;
694 default:
695 return -ESOCKTNOSUPPORT;
696 }
697
698
699 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
700 return -ENOBUFS;
701
702 sk->sk_protocol = protocol;
703
704 return 0;
705 }
706
707
708 static int
709 dn_release(struct socket *sock)
710 {
711 struct sock *sk = sock->sk;
712
713 if (sk) {
714 sock_orphan(sk);
715 sock_hold(sk);
716 lock_sock(sk);
717 dn_destroy_sock(sk);
718 release_sock(sk);
719 sock_put(sk);
720 }
721
722 return 0;
723 }
724
725 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
726 {
727 struct sock *sk = sock->sk;
728 struct dn_scp *scp = DN_SK(sk);
729 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
730 struct net_device *dev, *ldev;
731 int rv;
732
733 if (addr_len != sizeof(struct sockaddr_dn))
734 return -EINVAL;
735
736 if (saddr->sdn_family != AF_DECnet)
737 return -EINVAL;
738
739 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
740 return -EINVAL;
741
742 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
743 return -EINVAL;
744
745 if (saddr->sdn_flags & ~SDF_WILD)
746 return -EINVAL;
747
748 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
749 (saddr->sdn_flags & SDF_WILD)))
750 return -EACCES;
751
752 if (!(saddr->sdn_flags & SDF_WILD)) {
753 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
754 rcu_read_lock();
755 ldev = NULL;
756 for_each_netdev_rcu(&init_net, dev) {
757 if (!dev->dn_ptr)
758 continue;
759 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
760 ldev = dev;
761 break;
762 }
763 }
764 rcu_read_unlock();
765 if (ldev == NULL)
766 return -EADDRNOTAVAIL;
767 }
768 }
769
770 rv = -EINVAL;
771 lock_sock(sk);
772 if (sock_flag(sk, SOCK_ZAPPED)) {
773 memcpy(&scp->addr, saddr, addr_len);
774 sock_reset_flag(sk, SOCK_ZAPPED);
775
776 rv = dn_hash_sock(sk);
777 if (rv)
778 sock_set_flag(sk, SOCK_ZAPPED);
779 }
780 release_sock(sk);
781
782 return rv;
783 }
784
785
786 static int dn_auto_bind(struct socket *sock)
787 {
788 struct sock *sk = sock->sk;
789 struct dn_scp *scp = DN_SK(sk);
790 int rv;
791
792 sock_reset_flag(sk, SOCK_ZAPPED);
793
794 scp->addr.sdn_flags = 0;
795 scp->addr.sdn_objnum = 0;
796
797 /*
798 * This stuff is to keep compatibility with Eduardo's
799 * patch. I hope I can dispense with it shortly...
800 */
801 if ((scp->accessdata.acc_accl != 0) &&
802 (scp->accessdata.acc_accl <= 12)) {
803
804 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
805 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
806
807 scp->accessdata.acc_accl = 0;
808 memset(scp->accessdata.acc_acc, 0, 40);
809 }
810 /* End of compatibility stuff */
811
812 scp->addr.sdn_add.a_len = cpu_to_le16(2);
813 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
814 if (rv == 0) {
815 rv = dn_hash_sock(sk);
816 if (rv)
817 sock_set_flag(sk, SOCK_ZAPPED);
818 }
819
820 return rv;
821 }
822
823 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
824 {
825 struct dn_scp *scp = DN_SK(sk);
826 DEFINE_WAIT(wait);
827 int err;
828
829 if (scp->state != DN_CR)
830 return -EINVAL;
831
832 scp->state = DN_CC;
833 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
834 dn_send_conn_conf(sk, allocation);
835
836 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
837 for(;;) {
838 release_sock(sk);
839 if (scp->state == DN_CC)
840 *timeo = schedule_timeout(*timeo);
841 lock_sock(sk);
842 err = 0;
843 if (scp->state == DN_RUN)
844 break;
845 err = sock_error(sk);
846 if (err)
847 break;
848 err = sock_intr_errno(*timeo);
849 if (signal_pending(current))
850 break;
851 err = -EAGAIN;
852 if (!*timeo)
853 break;
854 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
855 }
856 finish_wait(sk_sleep(sk), &wait);
857 if (err == 0) {
858 sk->sk_socket->state = SS_CONNECTED;
859 } else if (scp->state != DN_CC) {
860 sk->sk_socket->state = SS_UNCONNECTED;
861 }
862 return err;
863 }
864
865 static int dn_wait_run(struct sock *sk, long *timeo)
866 {
867 struct dn_scp *scp = DN_SK(sk);
868 DEFINE_WAIT(wait);
869 int err = 0;
870
871 if (scp->state == DN_RUN)
872 goto out;
873
874 if (!*timeo)
875 return -EALREADY;
876
877 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
878 for(;;) {
879 release_sock(sk);
880 if (scp->state == DN_CI || scp->state == DN_CC)
881 *timeo = schedule_timeout(*timeo);
882 lock_sock(sk);
883 err = 0;
884 if (scp->state == DN_RUN)
885 break;
886 err = sock_error(sk);
887 if (err)
888 break;
889 err = sock_intr_errno(*timeo);
890 if (signal_pending(current))
891 break;
892 err = -ETIMEDOUT;
893 if (!*timeo)
894 break;
895 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
896 }
897 finish_wait(sk_sleep(sk), &wait);
898 out:
899 if (err == 0) {
900 sk->sk_socket->state = SS_CONNECTED;
901 } else if (scp->state != DN_CI && scp->state != DN_CC) {
902 sk->sk_socket->state = SS_UNCONNECTED;
903 }
904 return err;
905 }
906
907 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
908 {
909 struct socket *sock = sk->sk_socket;
910 struct dn_scp *scp = DN_SK(sk);
911 int err = -EISCONN;
912 struct flowidn fld;
913 struct dst_entry *dst;
914
915 if (sock->state == SS_CONNECTED)
916 goto out;
917
918 if (sock->state == SS_CONNECTING) {
919 err = 0;
920 if (scp->state == DN_RUN) {
921 sock->state = SS_CONNECTED;
922 goto out;
923 }
924 err = -ECONNREFUSED;
925 if (scp->state != DN_CI && scp->state != DN_CC) {
926 sock->state = SS_UNCONNECTED;
927 goto out;
928 }
929 return dn_wait_run(sk, timeo);
930 }
931
932 err = -EINVAL;
933 if (scp->state != DN_O)
934 goto out;
935
936 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
937 goto out;
938 if (addr->sdn_family != AF_DECnet)
939 goto out;
940 if (addr->sdn_flags & SDF_WILD)
941 goto out;
942
943 if (sock_flag(sk, SOCK_ZAPPED)) {
944 err = dn_auto_bind(sk->sk_socket);
945 if (err)
946 goto out;
947 }
948
949 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
950
951 err = -EHOSTUNREACH;
952 memset(&fld, 0, sizeof(fld));
953 fld.flowidn_oif = sk->sk_bound_dev_if;
954 fld.daddr = dn_saddr2dn(&scp->peer);
955 fld.saddr = dn_saddr2dn(&scp->addr);
956 dn_sk_ports_copy(&fld, scp);
957 fld.flowidn_proto = DNPROTO_NSP;
958 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
959 goto out;
960 dst = __sk_dst_get(sk);
961 sk->sk_route_caps = dst->dev->features;
962 sock->state = SS_CONNECTING;
963 scp->state = DN_CI;
964 scp->segsize_loc = dst_metric_advmss(dst);
965
966 dn_nsp_send_conninit(sk, NSP_CI);
967 err = -EINPROGRESS;
968 if (*timeo) {
969 err = dn_wait_run(sk, timeo);
970 }
971 out:
972 return err;
973 }
974
975 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
976 {
977 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
978 struct sock *sk = sock->sk;
979 int err;
980 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
981
982 lock_sock(sk);
983 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
984 release_sock(sk);
985
986 return err;
987 }
988
989 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
990 {
991 struct dn_scp *scp = DN_SK(sk);
992
993 switch (scp->state) {
994 case DN_RUN:
995 return 0;
996 case DN_CR:
997 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
998 case DN_CI:
999 case DN_CC:
1000 return dn_wait_run(sk, timeo);
1001 case DN_O:
1002 return __dn_connect(sk, addr, addrlen, timeo, flags);
1003 }
1004
1005 return -EINVAL;
1006 }
1007
1008
1009 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1010 {
1011 unsigned char *ptr = skb->data;
1012
1013 acc->acc_userl = *ptr++;
1014 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1015 ptr += acc->acc_userl;
1016
1017 acc->acc_passl = *ptr++;
1018 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1019 ptr += acc->acc_passl;
1020
1021 acc->acc_accl = *ptr++;
1022 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1023
1024 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1025
1026 }
1027
1028 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1029 {
1030 unsigned char *ptr = skb->data;
1031 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1032
1033 BUG_ON(len > 16); /* we've checked the contents earlier */
1034 opt->opt_optl = cpu_to_le16(len);
1035 opt->opt_status = 0;
1036 memcpy(opt->opt_data, ptr, len);
1037 skb_pull(skb, len + 1);
1038 }
1039
1040 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1041 {
1042 DEFINE_WAIT(wait);
1043 struct sk_buff *skb = NULL;
1044 int err = 0;
1045
1046 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1047 for(;;) {
1048 release_sock(sk);
1049 skb = skb_dequeue(&sk->sk_receive_queue);
1050 if (skb == NULL) {
1051 *timeo = schedule_timeout(*timeo);
1052 skb = skb_dequeue(&sk->sk_receive_queue);
1053 }
1054 lock_sock(sk);
1055 if (skb != NULL)
1056 break;
1057 err = -EINVAL;
1058 if (sk->sk_state != TCP_LISTEN)
1059 break;
1060 err = sock_intr_errno(*timeo);
1061 if (signal_pending(current))
1062 break;
1063 err = -EAGAIN;
1064 if (!*timeo)
1065 break;
1066 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1067 }
1068 finish_wait(sk_sleep(sk), &wait);
1069
1070 return skb == NULL ? ERR_PTR(err) : skb;
1071 }
1072
1073 static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
1074 bool kern)
1075 {
1076 struct sock *sk = sock->sk, *newsk;
1077 struct sk_buff *skb = NULL;
1078 struct dn_skb_cb *cb;
1079 unsigned char menuver;
1080 int err = 0;
1081 unsigned char type;
1082 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1083 struct dst_entry *dst;
1084
1085 lock_sock(sk);
1086
1087 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1088 release_sock(sk);
1089 return -EINVAL;
1090 }
1091
1092 skb = skb_dequeue(&sk->sk_receive_queue);
1093 if (skb == NULL) {
1094 skb = dn_wait_for_connect(sk, &timeo);
1095 if (IS_ERR(skb)) {
1096 release_sock(sk);
1097 return PTR_ERR(skb);
1098 }
1099 }
1100
1101 cb = DN_SKB_CB(skb);
1102 sk->sk_ack_backlog--;
1103 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1104 if (newsk == NULL) {
1105 release_sock(sk);
1106 kfree_skb(skb);
1107 return -ENOBUFS;
1108 }
1109 release_sock(sk);
1110
1111 dst = skb_dst(skb);
1112 sk_dst_set(newsk, dst);
1113 skb_dst_set(skb, NULL);
1114
1115 DN_SK(newsk)->state = DN_CR;
1116 DN_SK(newsk)->addrrem = cb->src_port;
1117 DN_SK(newsk)->services_rem = cb->services;
1118 DN_SK(newsk)->info_rem = cb->info;
1119 DN_SK(newsk)->segsize_rem = cb->segsize;
1120 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1121
1122 if (DN_SK(newsk)->segsize_rem < 230)
1123 DN_SK(newsk)->segsize_rem = 230;
1124
1125 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1126 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1127
1128 newsk->sk_state = TCP_LISTEN;
1129 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1130
1131 /*
1132 * If we are listening on a wild socket, we don't want
1133 * the newly created socket on the wrong hash queue.
1134 */
1135 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1136
1137 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1138 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1139 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1140 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1141
1142 menuver = *skb->data;
1143 skb_pull(skb, 1);
1144
1145 if (menuver & DN_MENUVER_ACC)
1146 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1147
1148 if (menuver & DN_MENUVER_USR)
1149 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1150
1151 if (menuver & DN_MENUVER_PRX)
1152 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1153
1154 if (menuver & DN_MENUVER_UIC)
1155 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1156
1157 kfree_skb(skb);
1158
1159 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1160 sizeof(struct optdata_dn));
1161 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1162 sizeof(struct optdata_dn));
1163
1164 lock_sock(newsk);
1165 err = dn_hash_sock(newsk);
1166 if (err == 0) {
1167 sock_reset_flag(newsk, SOCK_ZAPPED);
1168 dn_send_conn_ack(newsk);
1169
1170 /*
1171 * Here we use sk->sk_allocation since although the conn conf is
1172 * for the newsk, the context is the old socket.
1173 */
1174 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1175 err = dn_confirm_accept(newsk, &timeo,
1176 sk->sk_allocation);
1177 }
1178 release_sock(newsk);
1179 return err;
1180 }
1181
1182
1183 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1184 {
1185 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1186 struct sock *sk = sock->sk;
1187 struct dn_scp *scp = DN_SK(sk);
1188
1189 *uaddr_len = sizeof(struct sockaddr_dn);
1190
1191 lock_sock(sk);
1192
1193 if (peer) {
1194 if ((sock->state != SS_CONNECTED &&
1195 sock->state != SS_CONNECTING) &&
1196 scp->accept_mode == ACC_IMMED) {
1197 release_sock(sk);
1198 return -ENOTCONN;
1199 }
1200
1201 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1202 } else {
1203 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1204 }
1205
1206 release_sock(sk);
1207
1208 return 0;
1209 }
1210
1211
1212 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1213 {
1214 struct sock *sk = sock->sk;
1215 struct dn_scp *scp = DN_SK(sk);
1216 int mask = datagram_poll(file, sock, wait);
1217
1218 if (!skb_queue_empty(&scp->other_receive_queue))
1219 mask |= POLLRDBAND;
1220
1221 return mask;
1222 }
1223
1224 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1225 {
1226 struct sock *sk = sock->sk;
1227 struct dn_scp *scp = DN_SK(sk);
1228 int err = -EOPNOTSUPP;
1229 long amount = 0;
1230 struct sk_buff *skb;
1231 int val;
1232
1233 switch(cmd)
1234 {
1235 case SIOCGIFADDR:
1236 case SIOCSIFADDR:
1237 return dn_dev_ioctl(cmd, (void __user *)arg);
1238
1239 case SIOCATMARK:
1240 lock_sock(sk);
1241 val = !skb_queue_empty(&scp->other_receive_queue);
1242 if (scp->state != DN_RUN)
1243 val = -ENOTCONN;
1244 release_sock(sk);
1245 return val;
1246
1247 case TIOCOUTQ:
1248 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1249 if (amount < 0)
1250 amount = 0;
1251 err = put_user(amount, (int __user *)arg);
1252 break;
1253
1254 case TIOCINQ:
1255 lock_sock(sk);
1256 skb = skb_peek(&scp->other_receive_queue);
1257 if (skb) {
1258 amount = skb->len;
1259 } else {
1260 skb_queue_walk(&sk->sk_receive_queue, skb)
1261 amount += skb->len;
1262 }
1263 release_sock(sk);
1264 err = put_user(amount, (int __user *)arg);
1265 break;
1266
1267 default:
1268 err = -ENOIOCTLCMD;
1269 break;
1270 }
1271
1272 return err;
1273 }
1274
1275 static int dn_listen(struct socket *sock, int backlog)
1276 {
1277 struct sock *sk = sock->sk;
1278 int err = -EINVAL;
1279
1280 lock_sock(sk);
1281
1282 if (sock_flag(sk, SOCK_ZAPPED))
1283 goto out;
1284
1285 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1286 goto out;
1287
1288 sk->sk_max_ack_backlog = backlog;
1289 sk->sk_ack_backlog = 0;
1290 sk->sk_state = TCP_LISTEN;
1291 err = 0;
1292 dn_rehash_sock(sk);
1293
1294 out:
1295 release_sock(sk);
1296
1297 return err;
1298 }
1299
1300
1301 static int dn_shutdown(struct socket *sock, int how)
1302 {
1303 struct sock *sk = sock->sk;
1304 struct dn_scp *scp = DN_SK(sk);
1305 int err = -ENOTCONN;
1306
1307 lock_sock(sk);
1308
1309 if (sock->state == SS_UNCONNECTED)
1310 goto out;
1311
1312 err = 0;
1313 if (sock->state == SS_DISCONNECTING)
1314 goto out;
1315
1316 err = -EINVAL;
1317 if (scp->state == DN_O)
1318 goto out;
1319
1320 if (how != SHUT_RDWR)
1321 goto out;
1322
1323 sk->sk_shutdown = SHUTDOWN_MASK;
1324 dn_destroy_sock(sk);
1325 err = 0;
1326
1327 out:
1328 release_sock(sk);
1329
1330 return err;
1331 }
1332
1333 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1334 {
1335 struct sock *sk = sock->sk;
1336 int err;
1337
1338 lock_sock(sk);
1339 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1340 release_sock(sk);
1341 #ifdef CONFIG_NETFILTER
1342 /* we need to exclude all possible ENOPROTOOPTs except default case */
1343 if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
1344 optname != DSO_STREAM && optname != DSO_SEQPACKET)
1345 err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1346 #endif
1347
1348 return err;
1349 }
1350
1351 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1352 {
1353 struct sock *sk = sock->sk;
1354 struct dn_scp *scp = DN_SK(sk);
1355 long timeo;
1356 union {
1357 struct optdata_dn opt;
1358 struct accessdata_dn acc;
1359 int mode;
1360 unsigned long win;
1361 int val;
1362 unsigned char services;
1363 unsigned char info;
1364 } u;
1365 int err;
1366
1367 if (optlen && !optval)
1368 return -EINVAL;
1369
1370 if (optlen > sizeof(u))
1371 return -EINVAL;
1372
1373 if (copy_from_user(&u, optval, optlen))
1374 return -EFAULT;
1375
1376 switch (optname) {
1377 case DSO_CONDATA:
1378 if (sock->state == SS_CONNECTED)
1379 return -EISCONN;
1380 if ((scp->state != DN_O) && (scp->state != DN_CR))
1381 return -EINVAL;
1382
1383 if (optlen != sizeof(struct optdata_dn))
1384 return -EINVAL;
1385
1386 if (le16_to_cpu(u.opt.opt_optl) > 16)
1387 return -EINVAL;
1388
1389 memcpy(&scp->conndata_out, &u.opt, optlen);
1390 break;
1391
1392 case DSO_DISDATA:
1393 if (sock->state != SS_CONNECTED &&
1394 scp->accept_mode == ACC_IMMED)
1395 return -ENOTCONN;
1396
1397 if (optlen != sizeof(struct optdata_dn))
1398 return -EINVAL;
1399
1400 if (le16_to_cpu(u.opt.opt_optl) > 16)
1401 return -EINVAL;
1402
1403 memcpy(&scp->discdata_out, &u.opt, optlen);
1404 break;
1405
1406 case DSO_CONACCESS:
1407 if (sock->state == SS_CONNECTED)
1408 return -EISCONN;
1409 if (scp->state != DN_O)
1410 return -EINVAL;
1411
1412 if (optlen != sizeof(struct accessdata_dn))
1413 return -EINVAL;
1414
1415 if ((u.acc.acc_accl > DN_MAXACCL) ||
1416 (u.acc.acc_passl > DN_MAXACCL) ||
1417 (u.acc.acc_userl > DN_MAXACCL))
1418 return -EINVAL;
1419
1420 memcpy(&scp->accessdata, &u.acc, optlen);
1421 break;
1422
1423 case DSO_ACCEPTMODE:
1424 if (sock->state == SS_CONNECTED)
1425 return -EISCONN;
1426 if (scp->state != DN_O)
1427 return -EINVAL;
1428
1429 if (optlen != sizeof(int))
1430 return -EINVAL;
1431
1432 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1433 return -EINVAL;
1434
1435 scp->accept_mode = (unsigned char)u.mode;
1436 break;
1437
1438 case DSO_CONACCEPT:
1439 if (scp->state != DN_CR)
1440 return -EINVAL;
1441 timeo = sock_rcvtimeo(sk, 0);
1442 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1443 return err;
1444
1445 case DSO_CONREJECT:
1446 if (scp->state != DN_CR)
1447 return -EINVAL;
1448
1449 scp->state = DN_DR;
1450 sk->sk_shutdown = SHUTDOWN_MASK;
1451 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1452 break;
1453
1454 case DSO_MAXWINDOW:
1455 if (optlen != sizeof(unsigned long))
1456 return -EINVAL;
1457 if (u.win > NSP_MAX_WINDOW)
1458 u.win = NSP_MAX_WINDOW;
1459 if (u.win == 0)
1460 return -EINVAL;
1461 scp->max_window = u.win;
1462 if (scp->snd_window > u.win)
1463 scp->snd_window = u.win;
1464 break;
1465
1466 case DSO_NODELAY:
1467 if (optlen != sizeof(int))
1468 return -EINVAL;
1469 if (scp->nonagle == TCP_NAGLE_CORK)
1470 return -EINVAL;
1471 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1472 /* if (scp->nonagle == 1) { Push pending frames } */
1473 break;
1474
1475 case DSO_CORK:
1476 if (optlen != sizeof(int))
1477 return -EINVAL;
1478 if (scp->nonagle == TCP_NAGLE_OFF)
1479 return -EINVAL;
1480 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1481 /* if (scp->nonagle == 0) { Push pending frames } */
1482 break;
1483
1484 case DSO_SERVICES:
1485 if (optlen != sizeof(unsigned char))
1486 return -EINVAL;
1487 if ((u.services & ~NSP_FC_MASK) != 0x01)
1488 return -EINVAL;
1489 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1490 return -EINVAL;
1491 scp->services_loc = u.services;
1492 break;
1493
1494 case DSO_INFO:
1495 if (optlen != sizeof(unsigned char))
1496 return -EINVAL;
1497 if (u.info & 0xfc)
1498 return -EINVAL;
1499 scp->info_loc = u.info;
1500 break;
1501
1502 case DSO_LINKINFO:
1503 case DSO_STREAM:
1504 case DSO_SEQPACKET:
1505 default:
1506 return -ENOPROTOOPT;
1507 }
1508
1509 return 0;
1510 }
1511
1512 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1513 {
1514 struct sock *sk = sock->sk;
1515 int err;
1516
1517 lock_sock(sk);
1518 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1519 release_sock(sk);
1520 #ifdef CONFIG_NETFILTER
1521 if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
1522 optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
1523 optname != DSO_CONREJECT) {
1524 int len;
1525
1526 if (get_user(len, optlen))
1527 return -EFAULT;
1528
1529 err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1530 if (err >= 0)
1531 err = put_user(len, optlen);
1532 }
1533 #endif
1534
1535 return err;
1536 }
1537
1538 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1539 {
1540 struct sock *sk = sock->sk;
1541 struct dn_scp *scp = DN_SK(sk);
1542 struct linkinfo_dn link;
1543 unsigned int r_len;
1544 void *r_data = NULL;
1545 unsigned int val;
1546
1547 if(get_user(r_len , optlen))
1548 return -EFAULT;
1549
1550 switch (optname) {
1551 case DSO_CONDATA:
1552 if (r_len > sizeof(struct optdata_dn))
1553 r_len = sizeof(struct optdata_dn);
1554 r_data = &scp->conndata_in;
1555 break;
1556
1557 case DSO_DISDATA:
1558 if (r_len > sizeof(struct optdata_dn))
1559 r_len = sizeof(struct optdata_dn);
1560 r_data = &scp->discdata_in;
1561 break;
1562
1563 case DSO_CONACCESS:
1564 if (r_len > sizeof(struct accessdata_dn))
1565 r_len = sizeof(struct accessdata_dn);
1566 r_data = &scp->accessdata;
1567 break;
1568
1569 case DSO_ACCEPTMODE:
1570 if (r_len > sizeof(unsigned char))
1571 r_len = sizeof(unsigned char);
1572 r_data = &scp->accept_mode;
1573 break;
1574
1575 case DSO_LINKINFO:
1576 if (r_len > sizeof(struct linkinfo_dn))
1577 r_len = sizeof(struct linkinfo_dn);
1578
1579 memset(&link, 0, sizeof(link));
1580
1581 switch (sock->state) {
1582 case SS_CONNECTING:
1583 link.idn_linkstate = LL_CONNECTING;
1584 break;
1585 case SS_DISCONNECTING:
1586 link.idn_linkstate = LL_DISCONNECTING;
1587 break;
1588 case SS_CONNECTED:
1589 link.idn_linkstate = LL_RUNNING;
1590 break;
1591 default:
1592 link.idn_linkstate = LL_INACTIVE;
1593 }
1594
1595 link.idn_segsize = scp->segsize_rem;
1596 r_data = &link;
1597 break;
1598
1599 case DSO_MAXWINDOW:
1600 if (r_len > sizeof(unsigned long))
1601 r_len = sizeof(unsigned long);
1602 r_data = &scp->max_window;
1603 break;
1604
1605 case DSO_NODELAY:
1606 if (r_len > sizeof(int))
1607 r_len = sizeof(int);
1608 val = (scp->nonagle == TCP_NAGLE_OFF);
1609 r_data = &val;
1610 break;
1611
1612 case DSO_CORK:
1613 if (r_len > sizeof(int))
1614 r_len = sizeof(int);
1615 val = (scp->nonagle == TCP_NAGLE_CORK);
1616 r_data = &val;
1617 break;
1618
1619 case DSO_SERVICES:
1620 if (r_len > sizeof(unsigned char))
1621 r_len = sizeof(unsigned char);
1622 r_data = &scp->services_rem;
1623 break;
1624
1625 case DSO_INFO:
1626 if (r_len > sizeof(unsigned char))
1627 r_len = sizeof(unsigned char);
1628 r_data = &scp->info_rem;
1629 break;
1630
1631 case DSO_STREAM:
1632 case DSO_SEQPACKET:
1633 case DSO_CONACCEPT:
1634 case DSO_CONREJECT:
1635 default:
1636 return -ENOPROTOOPT;
1637 }
1638
1639 if (r_data) {
1640 if (copy_to_user(optval, r_data, r_len))
1641 return -EFAULT;
1642 if (put_user(r_len, optlen))
1643 return -EFAULT;
1644 }
1645
1646 return 0;
1647 }
1648
1649
1650 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1651 {
1652 struct sk_buff *skb;
1653 int len = 0;
1654
1655 if (flags & MSG_OOB)
1656 return !skb_queue_empty(q) ? 1 : 0;
1657
1658 skb_queue_walk(q, skb) {
1659 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1660 len += skb->len;
1661
1662 if (cb->nsp_flags & 0x40) {
1663 /* SOCK_SEQPACKET reads to EOM */
1664 if (sk->sk_type == SOCK_SEQPACKET)
1665 return 1;
1666 /* so does SOCK_STREAM unless WAITALL is specified */
1667 if (!(flags & MSG_WAITALL))
1668 return 1;
1669 }
1670
1671 /* minimum data length for read exceeded */
1672 if (len >= target)
1673 return 1;
1674 }
1675
1676 return 0;
1677 }
1678
1679
1680 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1681 int flags)
1682 {
1683 struct sock *sk = sock->sk;
1684 struct dn_scp *scp = DN_SK(sk);
1685 struct sk_buff_head *queue = &sk->sk_receive_queue;
1686 size_t target = size > 1 ? 1 : 0;
1687 size_t copied = 0;
1688 int rv = 0;
1689 struct sk_buff *skb, *n;
1690 struct dn_skb_cb *cb = NULL;
1691 unsigned char eor = 0;
1692 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1693
1694 lock_sock(sk);
1695
1696 if (sock_flag(sk, SOCK_ZAPPED)) {
1697 rv = -EADDRNOTAVAIL;
1698 goto out;
1699 }
1700
1701 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1702 rv = 0;
1703 goto out;
1704 }
1705
1706 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1707 if (rv)
1708 goto out;
1709
1710 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1711 rv = -EOPNOTSUPP;
1712 goto out;
1713 }
1714
1715 if (flags & MSG_OOB)
1716 queue = &scp->other_receive_queue;
1717
1718 if (flags & MSG_WAITALL)
1719 target = size;
1720
1721
1722 /*
1723 * See if there is data ready to read, sleep if there isn't
1724 */
1725 for(;;) {
1726 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1727
1728 if (sk->sk_err)
1729 goto out;
1730
1731 if (!skb_queue_empty(&scp->other_receive_queue)) {
1732 if (!(flags & MSG_OOB)) {
1733 msg->msg_flags |= MSG_OOB;
1734 if (!scp->other_report) {
1735 scp->other_report = 1;
1736 goto out;
1737 }
1738 }
1739 }
1740
1741 if (scp->state != DN_RUN)
1742 goto out;
1743
1744 if (signal_pending(current)) {
1745 rv = sock_intr_errno(timeo);
1746 goto out;
1747 }
1748
1749 if (dn_data_ready(sk, queue, flags, target))
1750 break;
1751
1752 if (flags & MSG_DONTWAIT) {
1753 rv = -EWOULDBLOCK;
1754 goto out;
1755 }
1756
1757 add_wait_queue(sk_sleep(sk), &wait);
1758 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1759 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1760 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1761 remove_wait_queue(sk_sleep(sk), &wait);
1762 }
1763
1764 skb_queue_walk_safe(queue, skb, n) {
1765 unsigned int chunk = skb->len;
1766 cb = DN_SKB_CB(skb);
1767
1768 if ((chunk + copied) > size)
1769 chunk = size - copied;
1770
1771 if (memcpy_to_msg(msg, skb->data, chunk)) {
1772 rv = -EFAULT;
1773 break;
1774 }
1775 copied += chunk;
1776
1777 if (!(flags & MSG_PEEK))
1778 skb_pull(skb, chunk);
1779
1780 eor = cb->nsp_flags & 0x40;
1781
1782 if (skb->len == 0) {
1783 skb_unlink(skb, queue);
1784 kfree_skb(skb);
1785 /*
1786 * N.B. Don't refer to skb or cb after this point
1787 * in loop.
1788 */
1789 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1790 scp->flowloc_sw = DN_SEND;
1791 dn_nsp_send_link(sk, DN_SEND, 0);
1792 }
1793 }
1794
1795 if (eor) {
1796 if (sk->sk_type == SOCK_SEQPACKET)
1797 break;
1798 if (!(flags & MSG_WAITALL))
1799 break;
1800 }
1801
1802 if (flags & MSG_OOB)
1803 break;
1804
1805 if (copied >= target)
1806 break;
1807 }
1808
1809 rv = copied;
1810
1811
1812 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1813 msg->msg_flags |= MSG_EOR;
1814
1815 out:
1816 if (rv == 0)
1817 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1818
1819 if ((rv >= 0) && msg->msg_name) {
1820 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1821 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1822 msg->msg_namelen = sizeof(struct sockaddr_dn);
1823 }
1824
1825 release_sock(sk);
1826
1827 return rv;
1828 }
1829
1830
1831 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1832 {
1833 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1834 if (skb_queue_len(queue) >= scp->snd_window)
1835 return 1;
1836 if (fctype != NSP_FC_NONE) {
1837 if (flags & MSG_OOB) {
1838 if (scp->flowrem_oth == 0)
1839 return 1;
1840 } else {
1841 if (scp->flowrem_dat == 0)
1842 return 1;
1843 }
1844 }
1845 return 0;
1846 }
1847
1848 /*
1849 * The DECnet spec requires that the "routing layer" accepts packets which
1850 * are at least 230 bytes in size. This excludes any headers which the NSP
1851 * layer might add, so we always assume that we'll be using the maximal
1852 * length header on data packets. The variation in length is due to the
1853 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1854 * make much practical difference.
1855 */
1856 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1857 {
1858 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1859 if (dev) {
1860 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1861 mtu -= LL_RESERVED_SPACE(dev);
1862 if (dn_db->use_long)
1863 mtu -= 21;
1864 else
1865 mtu -= 6;
1866 mtu -= DN_MAX_NSP_DATA_HEADER;
1867 } else {
1868 /*
1869 * 21 = long header, 16 = guess at MAC header length
1870 */
1871 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1872 }
1873 if (mtu > mss)
1874 mss = mtu;
1875 return mss;
1876 }
1877
1878 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1879 {
1880 struct dst_entry *dst = __sk_dst_get(sk);
1881 struct dn_scp *scp = DN_SK(sk);
1882 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1883
1884 /* Other data messages are limited to 16 bytes per packet */
1885 if (flags & MSG_OOB)
1886 return 16;
1887
1888 /* This works out the maximum size of segment we can send out */
1889 if (dst) {
1890 u32 mtu = dst_mtu(dst);
1891 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1892 }
1893
1894 return mss_now;
1895 }
1896
1897 /*
1898 * N.B. We get the timeout wrong here, but then we always did get it
1899 * wrong before and this is another step along the road to correcting
1900 * it. It ought to get updated each time we pass through the routine,
1901 * but in practise it probably doesn't matter too much for now.
1902 */
1903 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1904 unsigned long datalen, int noblock,
1905 int *errcode)
1906 {
1907 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1908 noblock, errcode);
1909 if (skb) {
1910 skb->protocol = htons(ETH_P_DNA_RT);
1911 skb->pkt_type = PACKET_OUTGOING;
1912 }
1913 return skb;
1914 }
1915
1916 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1917 {
1918 struct sock *sk = sock->sk;
1919 struct dn_scp *scp = DN_SK(sk);
1920 size_t mss;
1921 struct sk_buff_head *queue = &scp->data_xmit_queue;
1922 int flags = msg->msg_flags;
1923 int err = 0;
1924 size_t sent = 0;
1925 int addr_len = msg->msg_namelen;
1926 DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1927 struct sk_buff *skb = NULL;
1928 struct dn_skb_cb *cb;
1929 size_t len;
1930 unsigned char fctype;
1931 long timeo;
1932
1933 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1934 return -EOPNOTSUPP;
1935
1936 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1937 return -EINVAL;
1938
1939 lock_sock(sk);
1940 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1941 /*
1942 * The only difference between stream sockets and sequenced packet
1943 * sockets is that the stream sockets always behave as if MSG_EOR
1944 * has been set.
1945 */
1946 if (sock->type == SOCK_STREAM) {
1947 if (flags & MSG_EOR) {
1948 err = -EINVAL;
1949 goto out;
1950 }
1951 flags |= MSG_EOR;
1952 }
1953
1954
1955 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1956 if (err)
1957 goto out_err;
1958
1959 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1960 err = -EPIPE;
1961 if (!(flags & MSG_NOSIGNAL))
1962 send_sig(SIGPIPE, current, 0);
1963 goto out_err;
1964 }
1965
1966 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1967 dst_negative_advice(sk);
1968
1969 mss = scp->segsize_rem;
1970 fctype = scp->services_rem & NSP_FC_MASK;
1971
1972 mss = dn_current_mss(sk, flags);
1973
1974 if (flags & MSG_OOB) {
1975 queue = &scp->other_xmit_queue;
1976 if (size > mss) {
1977 err = -EMSGSIZE;
1978 goto out;
1979 }
1980 }
1981
1982 scp->persist_fxn = dn_nsp_xmit_timeout;
1983
1984 while(sent < size) {
1985 err = sock_error(sk);
1986 if (err)
1987 goto out;
1988
1989 if (signal_pending(current)) {
1990 err = sock_intr_errno(timeo);
1991 goto out;
1992 }
1993
1994 /*
1995 * Calculate size that we wish to send.
1996 */
1997 len = size - sent;
1998
1999 if (len > mss)
2000 len = mss;
2001
2002 /*
2003 * Wait for queue size to go down below the window
2004 * size.
2005 */
2006 if (dn_queue_too_long(scp, queue, flags)) {
2007 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2008
2009 if (flags & MSG_DONTWAIT) {
2010 err = -EWOULDBLOCK;
2011 goto out;
2012 }
2013
2014 add_wait_queue(sk_sleep(sk), &wait);
2015 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2016 sk_wait_event(sk, &timeo,
2017 !dn_queue_too_long(scp, queue, flags), &wait);
2018 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2019 remove_wait_queue(sk_sleep(sk), &wait);
2020 continue;
2021 }
2022
2023 /*
2024 * Get a suitably sized skb.
2025 * 64 is a bit of a hack really, but its larger than any
2026 * link-layer headers and has served us well as a good
2027 * guess as to their real length.
2028 */
2029 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2030 flags & MSG_DONTWAIT, &err);
2031
2032 if (err)
2033 break;
2034
2035 if (!skb)
2036 continue;
2037
2038 cb = DN_SKB_CB(skb);
2039
2040 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2041
2042 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2043 err = -EFAULT;
2044 goto out;
2045 }
2046
2047 if (flags & MSG_OOB) {
2048 cb->nsp_flags = 0x30;
2049 if (fctype != NSP_FC_NONE)
2050 scp->flowrem_oth--;
2051 } else {
2052 cb->nsp_flags = 0x00;
2053 if (scp->seg_total == 0)
2054 cb->nsp_flags |= 0x20;
2055
2056 scp->seg_total += len;
2057
2058 if (((sent + len) == size) && (flags & MSG_EOR)) {
2059 cb->nsp_flags |= 0x40;
2060 scp->seg_total = 0;
2061 if (fctype == NSP_FC_SCMC)
2062 scp->flowrem_dat--;
2063 }
2064 if (fctype == NSP_FC_SRC)
2065 scp->flowrem_dat--;
2066 }
2067
2068 sent += len;
2069 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2070 skb = NULL;
2071
2072 scp->persist = dn_nsp_persist(sk);
2073
2074 }
2075 out:
2076
2077 kfree_skb(skb);
2078
2079 release_sock(sk);
2080
2081 return sent ? sent : err;
2082
2083 out_err:
2084 err = sk_stream_error(sk, flags, err);
2085 release_sock(sk);
2086 return err;
2087 }
2088
2089 static int dn_device_event(struct notifier_block *this, unsigned long event,
2090 void *ptr)
2091 {
2092 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2093
2094 if (!net_eq(dev_net(dev), &init_net))
2095 return NOTIFY_DONE;
2096
2097 switch (event) {
2098 case NETDEV_UP:
2099 dn_dev_up(dev);
2100 break;
2101 case NETDEV_DOWN:
2102 dn_dev_down(dev);
2103 break;
2104 default:
2105 break;
2106 }
2107
2108 return NOTIFY_DONE;
2109 }
2110
2111 static struct notifier_block dn_dev_notifier = {
2112 .notifier_call = dn_device_event,
2113 };
2114
2115 static struct packet_type dn_dix_packet_type __read_mostly = {
2116 .type = cpu_to_be16(ETH_P_DNA_RT),
2117 .func = dn_route_rcv,
2118 };
2119
2120 #ifdef CONFIG_PROC_FS
2121 struct dn_iter_state {
2122 int bucket;
2123 };
2124
2125 static struct sock *dn_socket_get_first(struct seq_file *seq)
2126 {
2127 struct dn_iter_state *state = seq->private;
2128 struct sock *n = NULL;
2129
2130 for(state->bucket = 0;
2131 state->bucket < DN_SK_HASH_SIZE;
2132 ++state->bucket) {
2133 n = sk_head(&dn_sk_hash[state->bucket]);
2134 if (n)
2135 break;
2136 }
2137
2138 return n;
2139 }
2140
2141 static struct sock *dn_socket_get_next(struct seq_file *seq,
2142 struct sock *n)
2143 {
2144 struct dn_iter_state *state = seq->private;
2145
2146 n = sk_next(n);
2147 try_again:
2148 if (n)
2149 goto out;
2150 if (++state->bucket >= DN_SK_HASH_SIZE)
2151 goto out;
2152 n = sk_head(&dn_sk_hash[state->bucket]);
2153 goto try_again;
2154 out:
2155 return n;
2156 }
2157
2158 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2159 {
2160 struct sock *sk = dn_socket_get_first(seq);
2161
2162 if (sk) {
2163 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2164 --*pos;
2165 }
2166 return *pos ? NULL : sk;
2167 }
2168
2169 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2170 {
2171 void *rc;
2172 read_lock_bh(&dn_hash_lock);
2173 rc = socket_get_idx(seq, &pos);
2174 if (!rc) {
2175 read_unlock_bh(&dn_hash_lock);
2176 }
2177 return rc;
2178 }
2179
2180 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2181 {
2182 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2183 }
2184
2185 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2186 {
2187 void *rc;
2188
2189 if (v == SEQ_START_TOKEN) {
2190 rc = dn_socket_get_idx(seq, 0);
2191 goto out;
2192 }
2193
2194 rc = dn_socket_get_next(seq, v);
2195 if (rc)
2196 goto out;
2197 read_unlock_bh(&dn_hash_lock);
2198 out:
2199 ++*pos;
2200 return rc;
2201 }
2202
2203 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2204 {
2205 if (v && v != SEQ_START_TOKEN)
2206 read_unlock_bh(&dn_hash_lock);
2207 }
2208
2209 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2210
2211 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2212 {
2213 int i;
2214
2215 switch (le16_to_cpu(dn->sdn_objnamel)) {
2216 case 0:
2217 sprintf(buf, "%d", dn->sdn_objnum);
2218 break;
2219 default:
2220 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2221 buf[i] = dn->sdn_objname[i];
2222 if (IS_NOT_PRINTABLE(buf[i]))
2223 buf[i] = '.';
2224 }
2225 buf[i] = 0;
2226 }
2227 }
2228
2229 static char *dn_state2asc(unsigned char state)
2230 {
2231 switch (state) {
2232 case DN_O:
2233 return "OPEN";
2234 case DN_CR:
2235 return " CR";
2236 case DN_DR:
2237 return " DR";
2238 case DN_DRC:
2239 return " DRC";
2240 case DN_CC:
2241 return " CC";
2242 case DN_CI:
2243 return " CI";
2244 case DN_NR:
2245 return " NR";
2246 case DN_NC:
2247 return " NC";
2248 case DN_CD:
2249 return " CD";
2250 case DN_RJ:
2251 return " RJ";
2252 case DN_RUN:
2253 return " RUN";
2254 case DN_DI:
2255 return " DI";
2256 case DN_DIC:
2257 return " DIC";
2258 case DN_DN:
2259 return " DN";
2260 case DN_CL:
2261 return " CL";
2262 case DN_CN:
2263 return " CN";
2264 }
2265
2266 return "????";
2267 }
2268
2269 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2270 {
2271 struct dn_scp *scp = DN_SK(sk);
2272 char buf1[DN_ASCBUF_LEN];
2273 char buf2[DN_ASCBUF_LEN];
2274 char local_object[DN_MAXOBJL+3];
2275 char remote_object[DN_MAXOBJL+3];
2276
2277 dn_printable_object(&scp->addr, local_object);
2278 dn_printable_object(&scp->peer, remote_object);
2279
2280 seq_printf(seq,
2281 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2282 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2283 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2284 scp->addrloc,
2285 scp->numdat,
2286 scp->numoth,
2287 scp->ackxmt_dat,
2288 scp->ackxmt_oth,
2289 scp->flowloc_sw,
2290 local_object,
2291 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2292 scp->addrrem,
2293 scp->numdat_rcv,
2294 scp->numoth_rcv,
2295 scp->ackrcv_dat,
2296 scp->ackrcv_oth,
2297 scp->flowrem_sw,
2298 remote_object,
2299 dn_state2asc(scp->state),
2300 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2301 }
2302
2303 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2304 {
2305 if (v == SEQ_START_TOKEN) {
2306 seq_puts(seq, "Local Remote\n");
2307 } else {
2308 dn_socket_format_entry(seq, v);
2309 }
2310 return 0;
2311 }
2312
2313 static const struct seq_operations dn_socket_seq_ops = {
2314 .start = dn_socket_seq_start,
2315 .next = dn_socket_seq_next,
2316 .stop = dn_socket_seq_stop,
2317 .show = dn_socket_seq_show,
2318 };
2319
2320 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2321 {
2322 return seq_open_private(file, &dn_socket_seq_ops,
2323 sizeof(struct dn_iter_state));
2324 }
2325
2326 static const struct file_operations dn_socket_seq_fops = {
2327 .owner = THIS_MODULE,
2328 .open = dn_socket_seq_open,
2329 .read = seq_read,
2330 .llseek = seq_lseek,
2331 .release = seq_release_private,
2332 };
2333 #endif
2334
2335 static const struct net_proto_family dn_family_ops = {
2336 .family = AF_DECnet,
2337 .create = dn_create,
2338 .owner = THIS_MODULE,
2339 };
2340
2341 static const struct proto_ops dn_proto_ops = {
2342 .family = AF_DECnet,
2343 .owner = THIS_MODULE,
2344 .release = dn_release,
2345 .bind = dn_bind,
2346 .connect = dn_connect,
2347 .socketpair = sock_no_socketpair,
2348 .accept = dn_accept,
2349 .getname = dn_getname,
2350 .poll = dn_poll,
2351 .ioctl = dn_ioctl,
2352 .listen = dn_listen,
2353 .shutdown = dn_shutdown,
2354 .setsockopt = dn_setsockopt,
2355 .getsockopt = dn_getsockopt,
2356 .sendmsg = dn_sendmsg,
2357 .recvmsg = dn_recvmsg,
2358 .mmap = sock_no_mmap,
2359 .sendpage = sock_no_sendpage,
2360 };
2361
2362 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2363 MODULE_AUTHOR("Linux DECnet Project Team");
2364 MODULE_LICENSE("GPL");
2365 MODULE_ALIAS_NETPROTO(PF_DECnet);
2366
2367 static const char banner[] __initconst = KERN_INFO
2368 "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2369
2370 static int __init decnet_init(void)
2371 {
2372 int rc;
2373
2374 printk(banner);
2375
2376 rc = proto_register(&dn_proto, 1);
2377 if (rc != 0)
2378 goto out;
2379
2380 dn_neigh_init();
2381 dn_dev_init();
2382 dn_route_init();
2383 dn_fib_init();
2384
2385 sock_register(&dn_family_ops);
2386 dev_add_pack(&dn_dix_packet_type);
2387 register_netdevice_notifier(&dn_dev_notifier);
2388
2389 proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
2390 dn_register_sysctl();
2391 out:
2392 return rc;
2393
2394 }
2395 module_init(decnet_init);
2396
2397 /*
2398 * Prevent DECnet module unloading until its fixed properly.
2399 * Requires an audit of the code to check for memory leaks and
2400 * initialisation problems etc.
2401 */
2402 #if 0
2403 static void __exit decnet_exit(void)
2404 {
2405 sock_unregister(AF_DECnet);
2406 rtnl_unregister_all(PF_DECnet);
2407 dev_remove_pack(&dn_dix_packet_type);
2408
2409 dn_unregister_sysctl();
2410
2411 unregister_netdevice_notifier(&dn_dev_notifier);
2412
2413 dn_route_cleanup();
2414 dn_dev_cleanup();
2415 dn_neigh_cleanup();
2416 dn_fib_cleanup();
2417
2418 remove_proc_entry("decnet", init_net.proc_net);
2419
2420 proto_unregister(&dn_proto);
2421
2422 rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2423 }
2424 module_exit(decnet_exit);
2425 #endif
2426
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