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