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Linux 4.13.16
[linux/fpc-iii.git] / net / decnet / af_decnet.c
blob73a0399dc7a277178b0a432a067172131dce99ee
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 init_timer(&scp->delack_timer);
537 scp->delack_pending = 0;
538 scp->delack_fxn = dn_nsp_delayed_ack;
539
540 dn_start_slow_timer(sk);
541 out:
542 return sk;
543 }
544
545 /*
546 * Keepalive timer.
547 * FIXME: Should respond to SO_KEEPALIVE etc.
548 */
549 static void dn_keepalive(struct sock *sk)
550 {
551 struct dn_scp *scp = DN_SK(sk);
552
553 /*
554 * By checking the other_data transmit queue is empty
555 * we are double checking that we are not sending too
556 * many of these keepalive frames.
557 */
558 if (skb_queue_empty(&scp->other_xmit_queue))
559 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
560 }
561
562
563 /*
564 * Timer for shutdown/destroyed sockets.
565 * When socket is dead & no packets have been sent for a
566 * certain amount of time, they are removed by this
567 * routine. Also takes care of sending out DI & DC
568 * frames at correct times.
569 */
570 int dn_destroy_timer(struct sock *sk)
571 {
572 struct dn_scp *scp = DN_SK(sk);
573
574 scp->persist = dn_nsp_persist(sk);
575
576 switch (scp->state) {
577 case DN_DI:
578 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
579 if (scp->nsp_rxtshift >= decnet_di_count)
580 scp->state = DN_CN;
581 return 0;
582
583 case DN_DR:
584 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
585 if (scp->nsp_rxtshift >= decnet_dr_count)
586 scp->state = DN_DRC;
587 return 0;
588
589 case DN_DN:
590 if (scp->nsp_rxtshift < decnet_dn_count) {
591 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
592 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
593 GFP_ATOMIC);
594 return 0;
595 }
596 }
597
598 scp->persist = (HZ * decnet_time_wait);
599
600 if (sk->sk_socket)
601 return 0;
602
603 if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
604 dn_unhash_sock(sk);
605 sock_put(sk);
606 return 1;
607 }
608
609 return 0;
610 }
611
612 static void dn_destroy_sock(struct sock *sk)
613 {
614 struct dn_scp *scp = DN_SK(sk);
615
616 scp->nsp_rxtshift = 0; /* reset back off */
617
618 if (sk->sk_socket) {
619 if (sk->sk_socket->state != SS_UNCONNECTED)
620 sk->sk_socket->state = SS_DISCONNECTING;
621 }
622
623 sk->sk_state = TCP_CLOSE;
624
625 switch (scp->state) {
626 case DN_DN:
627 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
628 sk->sk_allocation);
629 scp->persist_fxn = dn_destroy_timer;
630 scp->persist = dn_nsp_persist(sk);
631 break;
632 case DN_CR:
633 scp->state = DN_DR;
634 goto disc_reject;
635 case DN_RUN:
636 scp->state = DN_DI;
637 case DN_DI:
638 case DN_DR:
639 disc_reject:
640 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
641 case DN_NC:
642 case DN_NR:
643 case DN_RJ:
644 case DN_DIC:
645 case DN_CN:
646 case DN_DRC:
647 case DN_CI:
648 case DN_CD:
649 scp->persist_fxn = dn_destroy_timer;
650 scp->persist = dn_nsp_persist(sk);
651 break;
652 default:
653 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
654 case DN_O:
655 dn_stop_slow_timer(sk);
656
657 dn_unhash_sock_bh(sk);
658 sock_put(sk);
659
660 break;
661 }
662 }
663
664 char *dn_addr2asc(__u16 addr, char *buf)
665 {
666 unsigned short node, area;
667
668 node = addr & 0x03ff;
669 area = addr >> 10;
670 sprintf(buf, "%hd.%hd", area, node);
671
672 return buf;
673 }
674
675
676
677 static int dn_create(struct net *net, struct socket *sock, int protocol,
678 int kern)
679 {
680 struct sock *sk;
681
682 if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
683 return -EINVAL;
684
685 if (!net_eq(net, &init_net))
686 return -EAFNOSUPPORT;
687
688 switch (sock->type) {
689 case SOCK_SEQPACKET:
690 if (protocol != DNPROTO_NSP)
691 return -EPROTONOSUPPORT;
692 break;
693 case SOCK_STREAM:
694 break;
695 default:
696 return -ESOCKTNOSUPPORT;
697 }
698
699
700 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
701 return -ENOBUFS;
702
703 sk->sk_protocol = protocol;
704
705 return 0;
706 }
707
708
709 static int
710 dn_release(struct socket *sock)
711 {
712 struct sock *sk = sock->sk;
713
714 if (sk) {
715 sock_orphan(sk);
716 sock_hold(sk);
717 lock_sock(sk);
718 dn_destroy_sock(sk);
719 release_sock(sk);
720 sock_put(sk);
721 }
722
723 return 0;
724 }
725
726 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
727 {
728 struct sock *sk = sock->sk;
729 struct dn_scp *scp = DN_SK(sk);
730 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
731 struct net_device *dev, *ldev;
732 int rv;
733
734 if (addr_len != sizeof(struct sockaddr_dn))
735 return -EINVAL;
736
737 if (saddr->sdn_family != AF_DECnet)
738 return -EINVAL;
739
740 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
741 return -EINVAL;
742
743 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
744 return -EINVAL;
745
746 if (saddr->sdn_flags & ~SDF_WILD)
747 return -EINVAL;
748
749 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
750 (saddr->sdn_flags & SDF_WILD)))
751 return -EACCES;
752
753 if (!(saddr->sdn_flags & SDF_WILD)) {
754 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
755 rcu_read_lock();
756 ldev = NULL;
757 for_each_netdev_rcu(&init_net, dev) {
758 if (!dev->dn_ptr)
759 continue;
760 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
761 ldev = dev;
762 break;
763 }
764 }
765 rcu_read_unlock();
766 if (ldev == NULL)
767 return -EADDRNOTAVAIL;
768 }
769 }
770
771 rv = -EINVAL;
772 lock_sock(sk);
773 if (sock_flag(sk, SOCK_ZAPPED)) {
774 memcpy(&scp->addr, saddr, addr_len);
775 sock_reset_flag(sk, SOCK_ZAPPED);
776
777 rv = dn_hash_sock(sk);
778 if (rv)
779 sock_set_flag(sk, SOCK_ZAPPED);
780 }
781 release_sock(sk);
782
783 return rv;
784 }
785
786
787 static int dn_auto_bind(struct socket *sock)
788 {
789 struct sock *sk = sock->sk;
790 struct dn_scp *scp = DN_SK(sk);
791 int rv;
792
793 sock_reset_flag(sk, SOCK_ZAPPED);
794
795 scp->addr.sdn_flags = 0;
796 scp->addr.sdn_objnum = 0;
797
798 /*
799 * This stuff is to keep compatibility with Eduardo's
800 * patch. I hope I can dispense with it shortly...
801 */
802 if ((scp->accessdata.acc_accl != 0) &&
803 (scp->accessdata.acc_accl <= 12)) {
804
805 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
806 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
807
808 scp->accessdata.acc_accl = 0;
809 memset(scp->accessdata.acc_acc, 0, 40);
810 }
811 /* End of compatibility stuff */
812
813 scp->addr.sdn_add.a_len = cpu_to_le16(2);
814 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
815 if (rv == 0) {
816 rv = dn_hash_sock(sk);
817 if (rv)
818 sock_set_flag(sk, SOCK_ZAPPED);
819 }
820
821 return rv;
822 }
823
824 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
825 {
826 struct dn_scp *scp = DN_SK(sk);
827 DEFINE_WAIT(wait);
828 int err;
829
830 if (scp->state != DN_CR)
831 return -EINVAL;
832
833 scp->state = DN_CC;
834 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
835 dn_send_conn_conf(sk, allocation);
836
837 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
838 for(;;) {
839 release_sock(sk);
840 if (scp->state == DN_CC)
841 *timeo = schedule_timeout(*timeo);
842 lock_sock(sk);
843 err = 0;
844 if (scp->state == DN_RUN)
845 break;
846 err = sock_error(sk);
847 if (err)
848 break;
849 err = sock_intr_errno(*timeo);
850 if (signal_pending(current))
851 break;
852 err = -EAGAIN;
853 if (!*timeo)
854 break;
855 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
856 }
857 finish_wait(sk_sleep(sk), &wait);
858 if (err == 0) {
859 sk->sk_socket->state = SS_CONNECTED;
860 } else if (scp->state != DN_CC) {
861 sk->sk_socket->state = SS_UNCONNECTED;
862 }
863 return err;
864 }
865
866 static int dn_wait_run(struct sock *sk, long *timeo)
867 {
868 struct dn_scp *scp = DN_SK(sk);
869 DEFINE_WAIT(wait);
870 int err = 0;
871
872 if (scp->state == DN_RUN)
873 goto out;
874
875 if (!*timeo)
876 return -EALREADY;
877
878 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
879 for(;;) {
880 release_sock(sk);
881 if (scp->state == DN_CI || scp->state == DN_CC)
882 *timeo = schedule_timeout(*timeo);
883 lock_sock(sk);
884 err = 0;
885 if (scp->state == DN_RUN)
886 break;
887 err = sock_error(sk);
888 if (err)
889 break;
890 err = sock_intr_errno(*timeo);
891 if (signal_pending(current))
892 break;
893 err = -ETIMEDOUT;
894 if (!*timeo)
895 break;
896 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
897 }
898 finish_wait(sk_sleep(sk), &wait);
899 out:
900 if (err == 0) {
901 sk->sk_socket->state = SS_CONNECTED;
902 } else if (scp->state != DN_CI && scp->state != DN_CC) {
903 sk->sk_socket->state = SS_UNCONNECTED;
904 }
905 return err;
906 }
907
908 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
909 {
910 struct socket *sock = sk->sk_socket;
911 struct dn_scp *scp = DN_SK(sk);
912 int err = -EISCONN;
913 struct flowidn fld;
914 struct dst_entry *dst;
915
916 if (sock->state == SS_CONNECTED)
917 goto out;
918
919 if (sock->state == SS_CONNECTING) {
920 err = 0;
921 if (scp->state == DN_RUN) {
922 sock->state = SS_CONNECTED;
923 goto out;
924 }
925 err = -ECONNREFUSED;
926 if (scp->state != DN_CI && scp->state != DN_CC) {
927 sock->state = SS_UNCONNECTED;
928 goto out;
929 }
930 return dn_wait_run(sk, timeo);
931 }
932
933 err = -EINVAL;
934 if (scp->state != DN_O)
935 goto out;
936
937 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
938 goto out;
939 if (addr->sdn_family != AF_DECnet)
940 goto out;
941 if (addr->sdn_flags & SDF_WILD)
942 goto out;
943
944 if (sock_flag(sk, SOCK_ZAPPED)) {
945 err = dn_auto_bind(sk->sk_socket);
946 if (err)
947 goto out;
948 }
949
950 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
951
952 err = -EHOSTUNREACH;
953 memset(&fld, 0, sizeof(fld));
954 fld.flowidn_oif = sk->sk_bound_dev_if;
955 fld.daddr = dn_saddr2dn(&scp->peer);
956 fld.saddr = dn_saddr2dn(&scp->addr);
957 dn_sk_ports_copy(&fld, scp);
958 fld.flowidn_proto = DNPROTO_NSP;
959 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
960 goto out;
961 dst = __sk_dst_get(sk);
962 sk->sk_route_caps = dst->dev->features;
963 sock->state = SS_CONNECTING;
964 scp->state = DN_CI;
965 scp->segsize_loc = dst_metric_advmss(dst);
966
967 dn_nsp_send_conninit(sk, NSP_CI);
968 err = -EINPROGRESS;
969 if (*timeo) {
970 err = dn_wait_run(sk, timeo);
971 }
972 out:
973 return err;
974 }
975
976 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
977 {
978 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
979 struct sock *sk = sock->sk;
980 int err;
981 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
982
983 lock_sock(sk);
984 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
985 release_sock(sk);
986
987 return err;
988 }
989
990 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
991 {
992 struct dn_scp *scp = DN_SK(sk);
993
994 switch (scp->state) {
995 case DN_RUN:
996 return 0;
997 case DN_CR:
998 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
999 case DN_CI:
1000 case DN_CC:
1001 return dn_wait_run(sk, timeo);
1002 case DN_O:
1003 return __dn_connect(sk, addr, addrlen, timeo, flags);
1004 }
1005
1006 return -EINVAL;
1007 }
1008
1009
1010 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1011 {
1012 unsigned char *ptr = skb->data;
1013
1014 acc->acc_userl = *ptr++;
1015 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1016 ptr += acc->acc_userl;
1017
1018 acc->acc_passl = *ptr++;
1019 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1020 ptr += acc->acc_passl;
1021
1022 acc->acc_accl = *ptr++;
1023 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1024
1025 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1026
1027 }
1028
1029 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1030 {
1031 unsigned char *ptr = skb->data;
1032 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1033
1034 BUG_ON(len > 16); /* we've checked the contents earlier */
1035 opt->opt_optl = cpu_to_le16(len);
1036 opt->opt_status = 0;
1037 memcpy(opt->opt_data, ptr, len);
1038 skb_pull(skb, len + 1);
1039 }
1040
1041 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1042 {
1043 DEFINE_WAIT(wait);
1044 struct sk_buff *skb = NULL;
1045 int err = 0;
1046
1047 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1048 for(;;) {
1049 release_sock(sk);
1050 skb = skb_dequeue(&sk->sk_receive_queue);
1051 if (skb == NULL) {
1052 *timeo = schedule_timeout(*timeo);
1053 skb = skb_dequeue(&sk->sk_receive_queue);
1054 }
1055 lock_sock(sk);
1056 if (skb != NULL)
1057 break;
1058 err = -EINVAL;
1059 if (sk->sk_state != TCP_LISTEN)
1060 break;
1061 err = sock_intr_errno(*timeo);
1062 if (signal_pending(current))
1063 break;
1064 err = -EAGAIN;
1065 if (!*timeo)
1066 break;
1067 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1068 }
1069 finish_wait(sk_sleep(sk), &wait);
1070
1071 return skb == NULL ? ERR_PTR(err) : skb;
1072 }
1073
1074 static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
1075 bool kern)
1076 {
1077 struct sock *sk = sock->sk, *newsk;
1078 struct sk_buff *skb = NULL;
1079 struct dn_skb_cb *cb;
1080 unsigned char menuver;
1081 int err = 0;
1082 unsigned char type;
1083 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1084 struct dst_entry *dst;
1085
1086 lock_sock(sk);
1087
1088 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1089 release_sock(sk);
1090 return -EINVAL;
1091 }
1092
1093 skb = skb_dequeue(&sk->sk_receive_queue);
1094 if (skb == NULL) {
1095 skb = dn_wait_for_connect(sk, &timeo);
1096 if (IS_ERR(skb)) {
1097 release_sock(sk);
1098 return PTR_ERR(skb);
1099 }
1100 }
1101
1102 cb = DN_SKB_CB(skb);
1103 sk->sk_ack_backlog--;
1104 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1105 if (newsk == NULL) {
1106 release_sock(sk);
1107 kfree_skb(skb);
1108 return -ENOBUFS;
1109 }
1110 release_sock(sk);
1111
1112 dst = skb_dst(skb);
1113 sk_dst_set(newsk, dst);
1114 skb_dst_set(skb, NULL);
1115
1116 DN_SK(newsk)->state = DN_CR;
1117 DN_SK(newsk)->addrrem = cb->src_port;
1118 DN_SK(newsk)->services_rem = cb->services;
1119 DN_SK(newsk)->info_rem = cb->info;
1120 DN_SK(newsk)->segsize_rem = cb->segsize;
1121 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1122
1123 if (DN_SK(newsk)->segsize_rem < 230)
1124 DN_SK(newsk)->segsize_rem = 230;
1125
1126 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1127 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1128
1129 newsk->sk_state = TCP_LISTEN;
1130 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1131
1132 /*
1133 * If we are listening on a wild socket, we don't want
1134 * the newly created socket on the wrong hash queue.
1135 */
1136 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1137
1138 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1139 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1140 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1141 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1142
1143 menuver = *skb->data;
1144 skb_pull(skb, 1);
1145
1146 if (menuver & DN_MENUVER_ACC)
1147 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1148
1149 if (menuver & DN_MENUVER_USR)
1150 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1151
1152 if (menuver & DN_MENUVER_PRX)
1153 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1154
1155 if (menuver & DN_MENUVER_UIC)
1156 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1157
1158 kfree_skb(skb);
1159
1160 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1161 sizeof(struct optdata_dn));
1162 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1163 sizeof(struct optdata_dn));
1164
1165 lock_sock(newsk);
1166 err = dn_hash_sock(newsk);
1167 if (err == 0) {
1168 sock_reset_flag(newsk, SOCK_ZAPPED);
1169 dn_send_conn_ack(newsk);
1170
1171 /*
1172 * Here we use sk->sk_allocation since although the conn conf is
1173 * for the newsk, the context is the old socket.
1174 */
1175 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1176 err = dn_confirm_accept(newsk, &timeo,
1177 sk->sk_allocation);
1178 }
1179 release_sock(newsk);
1180 return err;
1181 }
1182
1183
1184 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1185 {
1186 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1187 struct sock *sk = sock->sk;
1188 struct dn_scp *scp = DN_SK(sk);
1189
1190 *uaddr_len = sizeof(struct sockaddr_dn);
1191
1192 lock_sock(sk);
1193
1194 if (peer) {
1195 if ((sock->state != SS_CONNECTED &&
1196 sock->state != SS_CONNECTING) &&
1197 scp->accept_mode == ACC_IMMED) {
1198 release_sock(sk);
1199 return -ENOTCONN;
1200 }
1201
1202 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1203 } else {
1204 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1205 }
1206
1207 release_sock(sk);
1208
1209 return 0;
1210 }
1211
1212
1213 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1214 {
1215 struct sock *sk = sock->sk;
1216 struct dn_scp *scp = DN_SK(sk);
1217 int mask = datagram_poll(file, sock, wait);
1218
1219 if (!skb_queue_empty(&scp->other_receive_queue))
1220 mask |= POLLRDBAND;
1221
1222 return mask;
1223 }
1224
1225 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1226 {
1227 struct sock *sk = sock->sk;
1228 struct dn_scp *scp = DN_SK(sk);
1229 int err = -EOPNOTSUPP;
1230 long amount = 0;
1231 struct sk_buff *skb;
1232 int val;
1233
1234 switch(cmd)
1235 {
1236 case SIOCGIFADDR:
1237 case SIOCSIFADDR:
1238 return dn_dev_ioctl(cmd, (void __user *)arg);
1239
1240 case SIOCATMARK:
1241 lock_sock(sk);
1242 val = !skb_queue_empty(&scp->other_receive_queue);
1243 if (scp->state != DN_RUN)
1244 val = -ENOTCONN;
1245 release_sock(sk);
1246 return val;
1247
1248 case TIOCOUTQ:
1249 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1250 if (amount < 0)
1251 amount = 0;
1252 err = put_user(amount, (int __user *)arg);
1253 break;
1254
1255 case TIOCINQ:
1256 lock_sock(sk);
1257 skb = skb_peek(&scp->other_receive_queue);
1258 if (skb) {
1259 amount = skb->len;
1260 } else {
1261 skb_queue_walk(&sk->sk_receive_queue, skb)
1262 amount += skb->len;
1263 }
1264 release_sock(sk);
1265 err = put_user(amount, (int __user *)arg);
1266 break;
1267
1268 default:
1269 err = -ENOIOCTLCMD;
1270 break;
1271 }
1272
1273 return err;
1274 }
1275
1276 static int dn_listen(struct socket *sock, int backlog)
1277 {
1278 struct sock *sk = sock->sk;
1279 int err = -EINVAL;
1280
1281 lock_sock(sk);
1282
1283 if (sock_flag(sk, SOCK_ZAPPED))
1284 goto out;
1285
1286 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1287 goto out;
1288
1289 sk->sk_max_ack_backlog = backlog;
1290 sk->sk_ack_backlog = 0;
1291 sk->sk_state = TCP_LISTEN;
1292 err = 0;
1293 dn_rehash_sock(sk);
1294
1295 out:
1296 release_sock(sk);
1297
1298 return err;
1299 }
1300
1301
1302 static int dn_shutdown(struct socket *sock, int how)
1303 {
1304 struct sock *sk = sock->sk;
1305 struct dn_scp *scp = DN_SK(sk);
1306 int err = -ENOTCONN;
1307
1308 lock_sock(sk);
1309
1310 if (sock->state == SS_UNCONNECTED)
1311 goto out;
1312
1313 err = 0;
1314 if (sock->state == SS_DISCONNECTING)
1315 goto out;
1316
1317 err = -EINVAL;
1318 if (scp->state == DN_O)
1319 goto out;
1320
1321 if (how != SHUT_RDWR)
1322 goto out;
1323
1324 sk->sk_shutdown = SHUTDOWN_MASK;
1325 dn_destroy_sock(sk);
1326 err = 0;
1327
1328 out:
1329 release_sock(sk);
1330
1331 return err;
1332 }
1333
1334 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1335 {
1336 struct sock *sk = sock->sk;
1337 int err;
1338
1339 lock_sock(sk);
1340 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1341 release_sock(sk);
1342
1343 return err;
1344 }
1345
1346 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1347 {
1348 struct sock *sk = sock->sk;
1349 struct dn_scp *scp = DN_SK(sk);
1350 long timeo;
1351 union {
1352 struct optdata_dn opt;
1353 struct accessdata_dn acc;
1354 int mode;
1355 unsigned long win;
1356 int val;
1357 unsigned char services;
1358 unsigned char info;
1359 } u;
1360 int err;
1361
1362 if (optlen && !optval)
1363 return -EINVAL;
1364
1365 if (optlen > sizeof(u))
1366 return -EINVAL;
1367
1368 if (copy_from_user(&u, optval, optlen))
1369 return -EFAULT;
1370
1371 switch (optname) {
1372 case DSO_CONDATA:
1373 if (sock->state == SS_CONNECTED)
1374 return -EISCONN;
1375 if ((scp->state != DN_O) && (scp->state != DN_CR))
1376 return -EINVAL;
1377
1378 if (optlen != sizeof(struct optdata_dn))
1379 return -EINVAL;
1380
1381 if (le16_to_cpu(u.opt.opt_optl) > 16)
1382 return -EINVAL;
1383
1384 memcpy(&scp->conndata_out, &u.opt, optlen);
1385 break;
1386
1387 case DSO_DISDATA:
1388 if (sock->state != SS_CONNECTED &&
1389 scp->accept_mode == ACC_IMMED)
1390 return -ENOTCONN;
1391
1392 if (optlen != sizeof(struct optdata_dn))
1393 return -EINVAL;
1394
1395 if (le16_to_cpu(u.opt.opt_optl) > 16)
1396 return -EINVAL;
1397
1398 memcpy(&scp->discdata_out, &u.opt, optlen);
1399 break;
1400
1401 case DSO_CONACCESS:
1402 if (sock->state == SS_CONNECTED)
1403 return -EISCONN;
1404 if (scp->state != DN_O)
1405 return -EINVAL;
1406
1407 if (optlen != sizeof(struct accessdata_dn))
1408 return -EINVAL;
1409
1410 if ((u.acc.acc_accl > DN_MAXACCL) ||
1411 (u.acc.acc_passl > DN_MAXACCL) ||
1412 (u.acc.acc_userl > DN_MAXACCL))
1413 return -EINVAL;
1414
1415 memcpy(&scp->accessdata, &u.acc, optlen);
1416 break;
1417
1418 case DSO_ACCEPTMODE:
1419 if (sock->state == SS_CONNECTED)
1420 return -EISCONN;
1421 if (scp->state != DN_O)
1422 return -EINVAL;
1423
1424 if (optlen != sizeof(int))
1425 return -EINVAL;
1426
1427 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1428 return -EINVAL;
1429
1430 scp->accept_mode = (unsigned char)u.mode;
1431 break;
1432
1433 case DSO_CONACCEPT:
1434 if (scp->state != DN_CR)
1435 return -EINVAL;
1436 timeo = sock_rcvtimeo(sk, 0);
1437 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1438 return err;
1439
1440 case DSO_CONREJECT:
1441 if (scp->state != DN_CR)
1442 return -EINVAL;
1443
1444 scp->state = DN_DR;
1445 sk->sk_shutdown = SHUTDOWN_MASK;
1446 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1447 break;
1448
1449 default:
1450 #ifdef CONFIG_NETFILTER
1451 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1452 #endif
1453 case DSO_LINKINFO:
1454 case DSO_STREAM:
1455 case DSO_SEQPACKET:
1456 return -ENOPROTOOPT;
1457
1458 case DSO_MAXWINDOW:
1459 if (optlen != sizeof(unsigned long))
1460 return -EINVAL;
1461 if (u.win > NSP_MAX_WINDOW)
1462 u.win = NSP_MAX_WINDOW;
1463 if (u.win == 0)
1464 return -EINVAL;
1465 scp->max_window = u.win;
1466 if (scp->snd_window > u.win)
1467 scp->snd_window = u.win;
1468 break;
1469
1470 case DSO_NODELAY:
1471 if (optlen != sizeof(int))
1472 return -EINVAL;
1473 if (scp->nonagle == TCP_NAGLE_CORK)
1474 return -EINVAL;
1475 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1476 /* if (scp->nonagle == 1) { Push pending frames } */
1477 break;
1478
1479 case DSO_CORK:
1480 if (optlen != sizeof(int))
1481 return -EINVAL;
1482 if (scp->nonagle == TCP_NAGLE_OFF)
1483 return -EINVAL;
1484 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1485 /* if (scp->nonagle == 0) { Push pending frames } */
1486 break;
1487
1488 case DSO_SERVICES:
1489 if (optlen != sizeof(unsigned char))
1490 return -EINVAL;
1491 if ((u.services & ~NSP_FC_MASK) != 0x01)
1492 return -EINVAL;
1493 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1494 return -EINVAL;
1495 scp->services_loc = u.services;
1496 break;
1497
1498 case DSO_INFO:
1499 if (optlen != sizeof(unsigned char))
1500 return -EINVAL;
1501 if (u.info & 0xfc)
1502 return -EINVAL;
1503 scp->info_loc = u.info;
1504 break;
1505 }
1506
1507 return 0;
1508 }
1509
1510 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1511 {
1512 struct sock *sk = sock->sk;
1513 int err;
1514
1515 lock_sock(sk);
1516 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1517 release_sock(sk);
1518
1519 return err;
1520 }
1521
1522 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1523 {
1524 struct sock *sk = sock->sk;
1525 struct dn_scp *scp = DN_SK(sk);
1526 struct linkinfo_dn link;
1527 unsigned int r_len;
1528 void *r_data = NULL;
1529 unsigned int val;
1530
1531 if(get_user(r_len , optlen))
1532 return -EFAULT;
1533
1534 switch (optname) {
1535 case DSO_CONDATA:
1536 if (r_len > sizeof(struct optdata_dn))
1537 r_len = sizeof(struct optdata_dn);
1538 r_data = &scp->conndata_in;
1539 break;
1540
1541 case DSO_DISDATA:
1542 if (r_len > sizeof(struct optdata_dn))
1543 r_len = sizeof(struct optdata_dn);
1544 r_data = &scp->discdata_in;
1545 break;
1546
1547 case DSO_CONACCESS:
1548 if (r_len > sizeof(struct accessdata_dn))
1549 r_len = sizeof(struct accessdata_dn);
1550 r_data = &scp->accessdata;
1551 break;
1552
1553 case DSO_ACCEPTMODE:
1554 if (r_len > sizeof(unsigned char))
1555 r_len = sizeof(unsigned char);
1556 r_data = &scp->accept_mode;
1557 break;
1558
1559 case DSO_LINKINFO:
1560 if (r_len > sizeof(struct linkinfo_dn))
1561 r_len = sizeof(struct linkinfo_dn);
1562
1563 memset(&link, 0, sizeof(link));
1564
1565 switch (sock->state) {
1566 case SS_CONNECTING:
1567 link.idn_linkstate = LL_CONNECTING;
1568 break;
1569 case SS_DISCONNECTING:
1570 link.idn_linkstate = LL_DISCONNECTING;
1571 break;
1572 case SS_CONNECTED:
1573 link.idn_linkstate = LL_RUNNING;
1574 break;
1575 default:
1576 link.idn_linkstate = LL_INACTIVE;
1577 }
1578
1579 link.idn_segsize = scp->segsize_rem;
1580 r_data = &link;
1581 break;
1582
1583 default:
1584 #ifdef CONFIG_NETFILTER
1585 {
1586 int ret, len;
1587
1588 if (get_user(len, optlen))
1589 return -EFAULT;
1590
1591 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1592 if (ret >= 0)
1593 ret = put_user(len, optlen);
1594 return ret;
1595 }
1596 #endif
1597 case DSO_STREAM:
1598 case DSO_SEQPACKET:
1599 case DSO_CONACCEPT:
1600 case DSO_CONREJECT:
1601 return -ENOPROTOOPT;
1602
1603 case DSO_MAXWINDOW:
1604 if (r_len > sizeof(unsigned long))
1605 r_len = sizeof(unsigned long);
1606 r_data = &scp->max_window;
1607 break;
1608
1609 case DSO_NODELAY:
1610 if (r_len > sizeof(int))
1611 r_len = sizeof(int);
1612 val = (scp->nonagle == TCP_NAGLE_OFF);
1613 r_data = &val;
1614 break;
1615
1616 case DSO_CORK:
1617 if (r_len > sizeof(int))
1618 r_len = sizeof(int);
1619 val = (scp->nonagle == TCP_NAGLE_CORK);
1620 r_data = &val;
1621 break;
1622
1623 case DSO_SERVICES:
1624 if (r_len > sizeof(unsigned char))
1625 r_len = sizeof(unsigned char);
1626 r_data = &scp->services_rem;
1627 break;
1628
1629 case DSO_INFO:
1630 if (r_len > sizeof(unsigned char))
1631 r_len = sizeof(unsigned char);
1632 r_data = &scp->info_rem;
1633 break;
1634 }
1635
1636 if (r_data) {
1637 if (copy_to_user(optval, r_data, r_len))
1638 return -EFAULT;
1639 if (put_user(r_len, optlen))
1640 return -EFAULT;
1641 }
1642
1643 return 0;
1644 }
1645
1646
1647 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1648 {
1649 struct sk_buff *skb;
1650 int len = 0;
1651
1652 if (flags & MSG_OOB)
1653 return !skb_queue_empty(q) ? 1 : 0;
1654
1655 skb_queue_walk(q, skb) {
1656 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1657 len += skb->len;
1658
1659 if (cb->nsp_flags & 0x40) {
1660 /* SOCK_SEQPACKET reads to EOM */
1661 if (sk->sk_type == SOCK_SEQPACKET)
1662 return 1;
1663 /* so does SOCK_STREAM unless WAITALL is specified */
1664 if (!(flags & MSG_WAITALL))
1665 return 1;
1666 }
1667
1668 /* minimum data length for read exceeded */
1669 if (len >= target)
1670 return 1;
1671 }
1672
1673 return 0;
1674 }
1675
1676
1677 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1678 int flags)
1679 {
1680 struct sock *sk = sock->sk;
1681 struct dn_scp *scp = DN_SK(sk);
1682 struct sk_buff_head *queue = &sk->sk_receive_queue;
1683 size_t target = size > 1 ? 1 : 0;
1684 size_t copied = 0;
1685 int rv = 0;
1686 struct sk_buff *skb, *n;
1687 struct dn_skb_cb *cb = NULL;
1688 unsigned char eor = 0;
1689 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1690
1691 lock_sock(sk);
1692
1693 if (sock_flag(sk, SOCK_ZAPPED)) {
1694 rv = -EADDRNOTAVAIL;
1695 goto out;
1696 }
1697
1698 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1699 rv = 0;
1700 goto out;
1701 }
1702
1703 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1704 if (rv)
1705 goto out;
1706
1707 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1708 rv = -EOPNOTSUPP;
1709 goto out;
1710 }
1711
1712 if (flags & MSG_OOB)
1713 queue = &scp->other_receive_queue;
1714
1715 if (flags & MSG_WAITALL)
1716 target = size;
1717
1718
1719 /*
1720 * See if there is data ready to read, sleep if there isn't
1721 */
1722 for(;;) {
1723 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1724
1725 if (sk->sk_err)
1726 goto out;
1727
1728 if (!skb_queue_empty(&scp->other_receive_queue)) {
1729 if (!(flags & MSG_OOB)) {
1730 msg->msg_flags |= MSG_OOB;
1731 if (!scp->other_report) {
1732 scp->other_report = 1;
1733 goto out;
1734 }
1735 }
1736 }
1737
1738 if (scp->state != DN_RUN)
1739 goto out;
1740
1741 if (signal_pending(current)) {
1742 rv = sock_intr_errno(timeo);
1743 goto out;
1744 }
1745
1746 if (dn_data_ready(sk, queue, flags, target))
1747 break;
1748
1749 if (flags & MSG_DONTWAIT) {
1750 rv = -EWOULDBLOCK;
1751 goto out;
1752 }
1753
1754 add_wait_queue(sk_sleep(sk), &wait);
1755 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1756 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1757 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1758 remove_wait_queue(sk_sleep(sk), &wait);
1759 }
1760
1761 skb_queue_walk_safe(queue, skb, n) {
1762 unsigned int chunk = skb->len;
1763 cb = DN_SKB_CB(skb);
1764
1765 if ((chunk + copied) > size)
1766 chunk = size - copied;
1767
1768 if (memcpy_to_msg(msg, skb->data, chunk)) {
1769 rv = -EFAULT;
1770 break;
1771 }
1772 copied += chunk;
1773
1774 if (!(flags & MSG_PEEK))
1775 skb_pull(skb, chunk);
1776
1777 eor = cb->nsp_flags & 0x40;
1778
1779 if (skb->len == 0) {
1780 skb_unlink(skb, queue);
1781 kfree_skb(skb);
1782 /*
1783 * N.B. Don't refer to skb or cb after this point
1784 * in loop.
1785 */
1786 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1787 scp->flowloc_sw = DN_SEND;
1788 dn_nsp_send_link(sk, DN_SEND, 0);
1789 }
1790 }
1791
1792 if (eor) {
1793 if (sk->sk_type == SOCK_SEQPACKET)
1794 break;
1795 if (!(flags & MSG_WAITALL))
1796 break;
1797 }
1798
1799 if (flags & MSG_OOB)
1800 break;
1801
1802 if (copied >= target)
1803 break;
1804 }
1805
1806 rv = copied;
1807
1808
1809 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1810 msg->msg_flags |= MSG_EOR;
1811
1812 out:
1813 if (rv == 0)
1814 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1815
1816 if ((rv >= 0) && msg->msg_name) {
1817 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1818 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1819 msg->msg_namelen = sizeof(struct sockaddr_dn);
1820 }
1821
1822 release_sock(sk);
1823
1824 return rv;
1825 }
1826
1827
1828 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1829 {
1830 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1831 if (skb_queue_len(queue) >= scp->snd_window)
1832 return 1;
1833 if (fctype != NSP_FC_NONE) {
1834 if (flags & MSG_OOB) {
1835 if (scp->flowrem_oth == 0)
1836 return 1;
1837 } else {
1838 if (scp->flowrem_dat == 0)
1839 return 1;
1840 }
1841 }
1842 return 0;
1843 }
1844
1845 /*
1846 * The DECnet spec requires that the "routing layer" accepts packets which
1847 * are at least 230 bytes in size. This excludes any headers which the NSP
1848 * layer might add, so we always assume that we'll be using the maximal
1849 * length header on data packets. The variation in length is due to the
1850 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1851 * make much practical difference.
1852 */
1853 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1854 {
1855 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1856 if (dev) {
1857 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1858 mtu -= LL_RESERVED_SPACE(dev);
1859 if (dn_db->use_long)
1860 mtu -= 21;
1861 else
1862 mtu -= 6;
1863 mtu -= DN_MAX_NSP_DATA_HEADER;
1864 } else {
1865 /*
1866 * 21 = long header, 16 = guess at MAC header length
1867 */
1868 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1869 }
1870 if (mtu > mss)
1871 mss = mtu;
1872 return mss;
1873 }
1874
1875 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1876 {
1877 struct dst_entry *dst = __sk_dst_get(sk);
1878 struct dn_scp *scp = DN_SK(sk);
1879 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1880
1881 /* Other data messages are limited to 16 bytes per packet */
1882 if (flags & MSG_OOB)
1883 return 16;
1884
1885 /* This works out the maximum size of segment we can send out */
1886 if (dst) {
1887 u32 mtu = dst_mtu(dst);
1888 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1889 }
1890
1891 return mss_now;
1892 }
1893
1894 /*
1895 * N.B. We get the timeout wrong here, but then we always did get it
1896 * wrong before and this is another step along the road to correcting
1897 * it. It ought to get updated each time we pass through the routine,
1898 * but in practise it probably doesn't matter too much for now.
1899 */
1900 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1901 unsigned long datalen, int noblock,
1902 int *errcode)
1903 {
1904 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1905 noblock, errcode);
1906 if (skb) {
1907 skb->protocol = htons(ETH_P_DNA_RT);
1908 skb->pkt_type = PACKET_OUTGOING;
1909 }
1910 return skb;
1911 }
1912
1913 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1914 {
1915 struct sock *sk = sock->sk;
1916 struct dn_scp *scp = DN_SK(sk);
1917 size_t mss;
1918 struct sk_buff_head *queue = &scp->data_xmit_queue;
1919 int flags = msg->msg_flags;
1920 int err = 0;
1921 size_t sent = 0;
1922 int addr_len = msg->msg_namelen;
1923 DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1924 struct sk_buff *skb = NULL;
1925 struct dn_skb_cb *cb;
1926 size_t len;
1927 unsigned char fctype;
1928 long timeo;
1929
1930 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1931 return -EOPNOTSUPP;
1932
1933 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1934 return -EINVAL;
1935
1936 lock_sock(sk);
1937 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1938 /*
1939 * The only difference between stream sockets and sequenced packet
1940 * sockets is that the stream sockets always behave as if MSG_EOR
1941 * has been set.
1942 */
1943 if (sock->type == SOCK_STREAM) {
1944 if (flags & MSG_EOR) {
1945 err = -EINVAL;
1946 goto out;
1947 }
1948 flags |= MSG_EOR;
1949 }
1950
1951
1952 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1953 if (err)
1954 goto out_err;
1955
1956 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1957 err = -EPIPE;
1958 if (!(flags & MSG_NOSIGNAL))
1959 send_sig(SIGPIPE, current, 0);
1960 goto out_err;
1961 }
1962
1963 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1964 dst_negative_advice(sk);
1965
1966 mss = scp->segsize_rem;
1967 fctype = scp->services_rem & NSP_FC_MASK;
1968
1969 mss = dn_current_mss(sk, flags);
1970
1971 if (flags & MSG_OOB) {
1972 queue = &scp->other_xmit_queue;
1973 if (size > mss) {
1974 err = -EMSGSIZE;
1975 goto out;
1976 }
1977 }
1978
1979 scp->persist_fxn = dn_nsp_xmit_timeout;
1980
1981 while(sent < size) {
1982 err = sock_error(sk);
1983 if (err)
1984 goto out;
1985
1986 if (signal_pending(current)) {
1987 err = sock_intr_errno(timeo);
1988 goto out;
1989 }
1990
1991 /*
1992 * Calculate size that we wish to send.
1993 */
1994 len = size - sent;
1995
1996 if (len > mss)
1997 len = mss;
1998
1999 /*
2000 * Wait for queue size to go down below the window
2001 * size.
2002 */
2003 if (dn_queue_too_long(scp, queue, flags)) {
2004 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2005
2006 if (flags & MSG_DONTWAIT) {
2007 err = -EWOULDBLOCK;
2008 goto out;
2009 }
2010
2011 add_wait_queue(sk_sleep(sk), &wait);
2012 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2013 sk_wait_event(sk, &timeo,
2014 !dn_queue_too_long(scp, queue, flags), &wait);
2015 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2016 remove_wait_queue(sk_sleep(sk), &wait);
2017 continue;
2018 }
2019
2020 /*
2021 * Get a suitably sized skb.
2022 * 64 is a bit of a hack really, but its larger than any
2023 * link-layer headers and has served us well as a good
2024 * guess as to their real length.
2025 */
2026 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2027 flags & MSG_DONTWAIT, &err);
2028
2029 if (err)
2030 break;
2031
2032 if (!skb)
2033 continue;
2034
2035 cb = DN_SKB_CB(skb);
2036
2037 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2038
2039 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2040 err = -EFAULT;
2041 goto out;
2042 }
2043
2044 if (flags & MSG_OOB) {
2045 cb->nsp_flags = 0x30;
2046 if (fctype != NSP_FC_NONE)
2047 scp->flowrem_oth--;
2048 } else {
2049 cb->nsp_flags = 0x00;
2050 if (scp->seg_total == 0)
2051 cb->nsp_flags |= 0x20;
2052
2053 scp->seg_total += len;
2054
2055 if (((sent + len) == size) && (flags & MSG_EOR)) {
2056 cb->nsp_flags |= 0x40;
2057 scp->seg_total = 0;
2058 if (fctype == NSP_FC_SCMC)
2059 scp->flowrem_dat--;
2060 }
2061 if (fctype == NSP_FC_SRC)
2062 scp->flowrem_dat--;
2063 }
2064
2065 sent += len;
2066 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2067 skb = NULL;
2068
2069 scp->persist = dn_nsp_persist(sk);
2070
2071 }
2072 out:
2073
2074 kfree_skb(skb);
2075
2076 release_sock(sk);
2077
2078 return sent ? sent : err;
2079
2080 out_err:
2081 err = sk_stream_error(sk, flags, err);
2082 release_sock(sk);
2083 return err;
2084 }
2085
2086 static int dn_device_event(struct notifier_block *this, unsigned long event,
2087 void *ptr)
2088 {
2089 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2090
2091 if (!net_eq(dev_net(dev), &init_net))
2092 return NOTIFY_DONE;
2093
2094 switch (event) {
2095 case NETDEV_UP:
2096 dn_dev_up(dev);
2097 break;
2098 case NETDEV_DOWN:
2099 dn_dev_down(dev);
2100 break;
2101 default:
2102 break;
2103 }
2104
2105 return NOTIFY_DONE;
2106 }
2107
2108 static struct notifier_block dn_dev_notifier = {
2109 .notifier_call = dn_device_event,
2110 };
2111
2112 static struct packet_type dn_dix_packet_type __read_mostly = {
2113 .type = cpu_to_be16(ETH_P_DNA_RT),
2114 .func = dn_route_rcv,
2115 };
2116
2117 #ifdef CONFIG_PROC_FS
2118 struct dn_iter_state {
2119 int bucket;
2120 };
2121
2122 static struct sock *dn_socket_get_first(struct seq_file *seq)
2123 {
2124 struct dn_iter_state *state = seq->private;
2125 struct sock *n = NULL;
2126
2127 for(state->bucket = 0;
2128 state->bucket < DN_SK_HASH_SIZE;
2129 ++state->bucket) {
2130 n = sk_head(&dn_sk_hash[state->bucket]);
2131 if (n)
2132 break;
2133 }
2134
2135 return n;
2136 }
2137
2138 static struct sock *dn_socket_get_next(struct seq_file *seq,
2139 struct sock *n)
2140 {
2141 struct dn_iter_state *state = seq->private;
2142
2143 n = sk_next(n);
2144 try_again:
2145 if (n)
2146 goto out;
2147 if (++state->bucket >= DN_SK_HASH_SIZE)
2148 goto out;
2149 n = sk_head(&dn_sk_hash[state->bucket]);
2150 goto try_again;
2151 out:
2152 return n;
2153 }
2154
2155 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2156 {
2157 struct sock *sk = dn_socket_get_first(seq);
2158
2159 if (sk) {
2160 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2161 --*pos;
2162 }
2163 return *pos ? NULL : sk;
2164 }
2165
2166 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2167 {
2168 void *rc;
2169 read_lock_bh(&dn_hash_lock);
2170 rc = socket_get_idx(seq, &pos);
2171 if (!rc) {
2172 read_unlock_bh(&dn_hash_lock);
2173 }
2174 return rc;
2175 }
2176
2177 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2178 {
2179 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2180 }
2181
2182 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2183 {
2184 void *rc;
2185
2186 if (v == SEQ_START_TOKEN) {
2187 rc = dn_socket_get_idx(seq, 0);
2188 goto out;
2189 }
2190
2191 rc = dn_socket_get_next(seq, v);
2192 if (rc)
2193 goto out;
2194 read_unlock_bh(&dn_hash_lock);
2195 out:
2196 ++*pos;
2197 return rc;
2198 }
2199
2200 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2201 {
2202 if (v && v != SEQ_START_TOKEN)
2203 read_unlock_bh(&dn_hash_lock);
2204 }
2205
2206 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2207
2208 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2209 {
2210 int i;
2211
2212 switch (le16_to_cpu(dn->sdn_objnamel)) {
2213 case 0:
2214 sprintf(buf, "%d", dn->sdn_objnum);
2215 break;
2216 default:
2217 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2218 buf[i] = dn->sdn_objname[i];
2219 if (IS_NOT_PRINTABLE(buf[i]))
2220 buf[i] = '.';
2221 }
2222 buf[i] = 0;
2223 }
2224 }
2225
2226 static char *dn_state2asc(unsigned char state)
2227 {
2228 switch (state) {
2229 case DN_O:
2230 return "OPEN";
2231 case DN_CR:
2232 return " CR";
2233 case DN_DR:
2234 return " DR";
2235 case DN_DRC:
2236 return " DRC";
2237 case DN_CC:
2238 return " CC";
2239 case DN_CI:
2240 return " CI";
2241 case DN_NR:
2242 return " NR";
2243 case DN_NC:
2244 return " NC";
2245 case DN_CD:
2246 return " CD";
2247 case DN_RJ:
2248 return " RJ";
2249 case DN_RUN:
2250 return " RUN";
2251 case DN_DI:
2252 return " DI";
2253 case DN_DIC:
2254 return " DIC";
2255 case DN_DN:
2256 return " DN";
2257 case DN_CL:
2258 return " CL";
2259 case DN_CN:
2260 return " CN";
2261 }
2262
2263 return "????";
2264 }
2265
2266 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2267 {
2268 struct dn_scp *scp = DN_SK(sk);
2269 char buf1[DN_ASCBUF_LEN];
2270 char buf2[DN_ASCBUF_LEN];
2271 char local_object[DN_MAXOBJL+3];
2272 char remote_object[DN_MAXOBJL+3];
2273
2274 dn_printable_object(&scp->addr, local_object);
2275 dn_printable_object(&scp->peer, remote_object);
2276
2277 seq_printf(seq,
2278 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2279 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2280 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2281 scp->addrloc,
2282 scp->numdat,
2283 scp->numoth,
2284 scp->ackxmt_dat,
2285 scp->ackxmt_oth,
2286 scp->flowloc_sw,
2287 local_object,
2288 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2289 scp->addrrem,
2290 scp->numdat_rcv,
2291 scp->numoth_rcv,
2292 scp->ackrcv_dat,
2293 scp->ackrcv_oth,
2294 scp->flowrem_sw,
2295 remote_object,
2296 dn_state2asc(scp->state),
2297 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2298 }
2299
2300 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2301 {
2302 if (v == SEQ_START_TOKEN) {
2303 seq_puts(seq, "Local Remote\n");
2304 } else {
2305 dn_socket_format_entry(seq, v);
2306 }
2307 return 0;
2308 }
2309
2310 static const struct seq_operations dn_socket_seq_ops = {
2311 .start = dn_socket_seq_start,
2312 .next = dn_socket_seq_next,
2313 .stop = dn_socket_seq_stop,
2314 .show = dn_socket_seq_show,
2315 };
2316
2317 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2318 {
2319 return seq_open_private(file, &dn_socket_seq_ops,
2320 sizeof(struct dn_iter_state));
2321 }
2322
2323 static const struct file_operations dn_socket_seq_fops = {
2324 .owner = THIS_MODULE,
2325 .open = dn_socket_seq_open,
2326 .read = seq_read,
2327 .llseek = seq_lseek,
2328 .release = seq_release_private,
2329 };
2330 #endif
2331
2332 static const struct net_proto_family dn_family_ops = {
2333 .family = AF_DECnet,
2334 .create = dn_create,
2335 .owner = THIS_MODULE,
2336 };
2337
2338 static const struct proto_ops dn_proto_ops = {
2339 .family = AF_DECnet,
2340 .owner = THIS_MODULE,
2341 .release = dn_release,
2342 .bind = dn_bind,
2343 .connect = dn_connect,
2344 .socketpair = sock_no_socketpair,
2345 .accept = dn_accept,
2346 .getname = dn_getname,
2347 .poll = dn_poll,
2348 .ioctl = dn_ioctl,
2349 .listen = dn_listen,
2350 .shutdown = dn_shutdown,
2351 .setsockopt = dn_setsockopt,
2352 .getsockopt = dn_getsockopt,
2353 .sendmsg = dn_sendmsg,
2354 .recvmsg = dn_recvmsg,
2355 .mmap = sock_no_mmap,
2356 .sendpage = sock_no_sendpage,
2357 };
2358
2359 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2360 MODULE_AUTHOR("Linux DECnet Project Team");
2361 MODULE_LICENSE("GPL");
2362 MODULE_ALIAS_NETPROTO(PF_DECnet);
2363
2364 static const char banner[] __initconst = KERN_INFO
2365 "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2366
2367 static int __init decnet_init(void)
2368 {
2369 int rc;
2370
2371 printk(banner);
2372
2373 rc = proto_register(&dn_proto, 1);
2374 if (rc != 0)
2375 goto out;
2376
2377 dn_neigh_init();
2378 dn_dev_init();
2379 dn_route_init();
2380 dn_fib_init();
2381
2382 sock_register(&dn_family_ops);
2383 dev_add_pack(&dn_dix_packet_type);
2384 register_netdevice_notifier(&dn_dev_notifier);
2385
2386 proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
2387 dn_register_sysctl();
2388 out:
2389 return rc;
2390
2391 }
2392 module_init(decnet_init);
2393
2394 /*
2395 * Prevent DECnet module unloading until its fixed properly.
2396 * Requires an audit of the code to check for memory leaks and
2397 * initialisation problems etc.
2398 */
2399 #if 0
2400 static void __exit decnet_exit(void)
2401 {
2402 sock_unregister(AF_DECnet);
2403 rtnl_unregister_all(PF_DECnet);
2404 dev_remove_pack(&dn_dix_packet_type);
2405
2406 dn_unregister_sysctl();
2407
2408 unregister_netdevice_notifier(&dn_dev_notifier);
2409
2410 dn_route_cleanup();
2411 dn_dev_cleanup();
2412 dn_neigh_cleanup();
2413 dn_fib_cleanup();
2414
2415 remove_proc_entry("decnet", init_net.proc_net);
2416
2417 proto_unregister(&dn_proto);
2418
2419 rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2420 }
2421 module_exit(decnet_exit);
2422 #endif
Linux with added FPC-III support