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Merge tag 'v3.10.95' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / decnet / af_decnet.c
CommitLineData
1da177e4
LT		 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
429eb0fa 48
1da177e4
LT		 49 This program is free software; you can redistribute it and/or modify
50 it under the terms of the GNU General Public License as published by
51 the Free Software Foundation; either version 2 of the License, or
52 any later version.
53
54 This program is distributed in the hope that it will be useful,
55 but WITHOUT ANY WARRANTY; without even the implied warranty of
56 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
57 GNU General Public License for more details.
58
59HISTORY:
60
61Version Kernel Date Author/Comments
62------- ------ ---- ---------------
63Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
64 (emserrat@geocities.com)
65
429eb0fa 66 First Development of DECnet Socket La-
1da177e4
LT		 67 yer for Linux. Only supports outgoing
68 connections.
69
70Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
71 (patrick@pandh.demon.co.uk)
72
73 Port to new kernel development version.
74
75Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
76 (emserrat@geocities.com)
77 _
429eb0fa
YH		 78 Added support for incoming connections
79 so we can start developing server apps
80 on Linux.
1da177e4
LT		 81 -
82 Module Support
83Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
429eb0fa
YH		 84 (emserrat@geocities.com)
85 _
86 Added support for X11R6.4. Now we can
87 use DECnet transport for X on Linux!!!
88 -
1da177e4 89Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
429eb0fa
YH		 90 (emserrat@geocities.com)
91 Removed bugs on flow control
92 Removed bugs on incoming accessdata
93 order
94 -
1da177e4 95Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
429eb0fa 96 dn_recvmsg fixes
1da177e4 97
429eb0fa
YH		 98 Patrick J. Caulfield
99 dn_bind fixes
1da177e4
LT		 100*******************************************************************************/
101
1da177e4
LT		 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>
c752f073 120#include <net/tcp_states.h>
1da177e4 121#include <net/flow.h>
1da177e4 122#include <asm/ioctls.h>
4fc268d2 123#include <linux/capability.h>
1da177e4
LT		 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>
457c4cbc 130#include <net/net_namespace.h>
1da177e4
LT		 131#include <net/neighbour.h>
132#include <net/dst.h>
a8731cbf 133#include <net/fib_rules.h>
1da177e4
LT		 134#include <net/dn.h>
135#include <net/dn_nsp.h>
136#include <net/dn_dev.h>
137#include <net/dn_route.h>
138#include <net/dn_fib.h>
139#include <net/dn_neigh.h>
140
141struct dn_sock {
142 struct sock sk;
143 struct dn_scp scp;
144};
145
146static void dn_keepalive(struct sock *sk);
147
148#define DN_SK_HASH_SHIFT 8
149#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
150#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
151
152
90ddc4f0 153static const struct proto_ops dn_proto_ops;
1da177e4
LT		 154static DEFINE_RWLOCK(dn_hash_lock);
155static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
156static struct hlist_head dn_wild_sk;
8d987e5c 157static atomic_long_t decnet_memory_allocated;
1da177e4 158
b7058842 159static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
1da177e4
LT		 160static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
161
162static struct hlist_head *dn_find_list(struct sock *sk)
163{
164 struct dn_scp *scp = DN_SK(sk);
165
166 if (scp->addr.sdn_flags & SDF_WILD)
167 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
168
c4106aa8 169 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
1da177e4
LT		 170}
171
429eb0fa 172/*
1da177e4
LT		 173 * Valid ports are those greater than zero and not already in use.
174 */
c4ea94ab 175static int check_port(__le16 port)
1da177e4
LT		 176{
177 struct sock *sk;
1da177e4
LT		 178
179 if (port == 0)
180 return -1;
181
b67bfe0d 182 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
1da177e4
LT		 183 struct dn_scp *scp = DN_SK(sk);
184 if (scp->addrloc == port)
185 return -1;
186 }
187 return 0;
188}
189
190static unsigned short port_alloc(struct sock *sk)
191{
192 struct dn_scp *scp = DN_SK(sk);
193static unsigned short port = 0x2000;
194 unsigned short i_port = port;
195
c4106aa8 196 while(check_port(cpu_to_le16(++port)) != 0) {
1da177e4
LT		 197 if (port == i_port)
198 return 0;
199 }
200
c4106aa8 201 scp->addrloc = cpu_to_le16(port);
1da177e4
LT		 202
203 return 1;
204}
205
206/*
207 * Since this is only ever called from user
208 * level, we don't need a write_lock() version
209 * of this.
210 */
211static int dn_hash_sock(struct sock *sk)
212{
213 struct dn_scp *scp = DN_SK(sk);
214 struct hlist_head *list;
215 int rv = -EUSERS;
216
217 BUG_ON(sk_hashed(sk));
218
219 write_lock_bh(&dn_hash_lock);
429eb0fa 220
1da177e4
LT		 221 if (!scp->addrloc && !port_alloc(sk))
222 goto out;
223
224 rv = -EADDRINUSE;
225 if ((list = dn_find_list(sk)) == NULL)
226 goto out;
227
228 sk_add_node(sk, list);
229 rv = 0;
230out:
231 write_unlock_bh(&dn_hash_lock);
232 return rv;
233}
234
235static void dn_unhash_sock(struct sock *sk)
236{
237 write_lock(&dn_hash_lock);
238 sk_del_node_init(sk);
239 write_unlock(&dn_hash_lock);
240}
241
242static void dn_unhash_sock_bh(struct sock *sk)
243{
244 write_lock_bh(&dn_hash_lock);
245 sk_del_node_init(sk);
246 write_unlock_bh(&dn_hash_lock);
247}
248
249static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
250{
251 int i;
95c96174 252 unsigned int hash = addr->sdn_objnum;
1da177e4
LT		 253
254 if (hash == 0) {
255 hash = addr->sdn_objnamel;
c4106aa8 256 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
1da177e4
LT		 257 hash ^= addr->sdn_objname[i];
258 hash ^= (hash << 3);
259 }
260 }
261
262 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
263}
264
265/*
266 * Called to transform a socket from bound (i.e. with a local address)
267 * into a listening socket (doesn't need a local port number) and rehashes
268 * based upon the object name/number.
269 */
270static void dn_rehash_sock(struct sock *sk)
271{
272 struct hlist_head *list;
273 struct dn_scp *scp = DN_SK(sk);
274
275 if (scp->addr.sdn_flags & SDF_WILD)
276 return;
277
278 write_lock_bh(&dn_hash_lock);
279 sk_del_node_init(sk);
280 DN_SK(sk)->addrloc = 0;
281 list = listen_hash(&DN_SK(sk)->addr);
282 sk_add_node(sk, list);
283 write_unlock_bh(&dn_hash_lock);
284}
285
286int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
287{
288 int len = 2;
289
290 *buf++ = type;
291
06f8fe11
JP		 292 switch (type) {
293 case 0:
294 *buf++ = sdn->sdn_objnum;
295 break;
296 case 1:
297 *buf++ = 0;
298 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
299 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
300 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
301 break;
302 case 2:
303 memset(buf, 0, 5);
304 buf += 5;
305 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
306 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
307 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
308 break;
1da177e4
LT		 309 }
310
311 return len;
312}
313
314/*
315 * On reception of usernames, we handle types 1 and 0 for destination
316 * addresses only. Types 2 and 4 are used for source addresses, but the
317 * UIC, GIC are ignored and they are both treated the same way. Type 3
318 * is never used as I've no idea what its purpose might be or what its
319 * format is.
320 */
321int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
322{
323 unsigned char type;
324 int size = len;
325 int namel = 12;
326
327 sdn->sdn_objnum = 0;
c4106aa8 328 sdn->sdn_objnamel = cpu_to_le16(0);
1da177e4
LT		 329 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
330
331 if (len < 2)
332 return -1;
333
334 len -= 2;
335 *fmt = *data++;
336 type = *data++;
337
06f8fe11
JP		 338 switch (*fmt) {
339 case 0:
340 sdn->sdn_objnum = type;
341 return 2;
342 case 1:
343 namel = 16;
344 break;
345 case 2:
346 len -= 4;
347 data += 4;
348 break;
349 case 4:
350 len -= 8;
351 data += 8;
352 break;
353 default:
354 return -1;
1da177e4
LT		 355 }
356
357 len -= 1;
358
359 if (len < 0)
360 return -1;
361
c4106aa8
HH		 362 sdn->sdn_objnamel = cpu_to_le16(*data++);
363 len -= le16_to_cpu(sdn->sdn_objnamel);
1da177e4 364
c4106aa8 365 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
1da177e4
LT		 366 return -1;
367
c4106aa8 368 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
1da177e4
LT		 369
370 return size - len;
371}
372
373struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
374{
375 struct hlist_head *list = listen_hash(addr);
1da177e4
LT		 376 struct sock *sk;
377
378 read_lock(&dn_hash_lock);
b67bfe0d 379 sk_for_each(sk, list) {
1da177e4
LT		 380 struct dn_scp *scp = DN_SK(sk);
381 if (sk->sk_state != TCP_LISTEN)
382 continue;
383 if (scp->addr.sdn_objnum) {
384 if (scp->addr.sdn_objnum != addr->sdn_objnum)
385 continue;
386 } else {
387 if (addr->sdn_objnum)
388 continue;
389 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
390 continue;
c4106aa8 391 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
1da177e4
LT		 392 continue;
393 }
394 sock_hold(sk);
395 read_unlock(&dn_hash_lock);
396 return sk;
397 }
398
399 sk = sk_head(&dn_wild_sk);
400 if (sk) {
429eb0fa 401 if (sk->sk_state == TCP_LISTEN)
1da177e4
LT		 402 sock_hold(sk);
403 else
404 sk = NULL;
405 }
406
407 read_unlock(&dn_hash_lock);
408 return sk;
409}
410
411struct sock *dn_find_by_skb(struct sk_buff *skb)
412{
413 struct dn_skb_cb *cb = DN_SKB_CB(skb);
414 struct sock *sk;
1da177e4
LT		 415 struct dn_scp *scp;
416
417 read_lock(&dn_hash_lock);
b67bfe0d 418 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
1da177e4
LT		 419 scp = DN_SK(sk);
420 if (cb->src != dn_saddr2dn(&scp->peer))
421 continue;
422 if (cb->dst_port != scp->addrloc)
423 continue;
424 if (scp->addrrem && (cb->src_port != scp->addrrem))
425 continue;
426 sock_hold(sk);
427 goto found;
428 }
429 sk = NULL;
430found:
431 read_unlock(&dn_hash_lock);
432 return sk;
433}
434
435
436
437static void dn_destruct(struct sock *sk)
438{
439 struct dn_scp *scp = DN_SK(sk);
440
441 skb_queue_purge(&scp->data_xmit_queue);
442 skb_queue_purge(&scp->other_xmit_queue);
443 skb_queue_purge(&scp->other_receive_queue);
444
b6c6712a 445 dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
1da177e4
LT		 446}
447
1f12bcc9
SW		 448static int dn_memory_pressure;
449
5c52ba17 450static void dn_enter_memory_pressure(struct sock *sk)
1f12bcc9
SW		 451{
452 if (!dn_memory_pressure) {
453 dn_memory_pressure = 1;
454 }
455}
456
1da177e4 457static struct proto dn_proto = {
1f12bcc9
SW		 458 .name = "NSP",
459 .owner = THIS_MODULE,
460 .enter_memory_pressure = dn_enter_memory_pressure,
461 .memory_pressure = &dn_memory_pressure,
462 .memory_allocated = &decnet_memory_allocated,
463 .sysctl_mem = sysctl_decnet_mem,
464 .sysctl_wmem = sysctl_decnet_wmem,
465 .sysctl_rmem = sysctl_decnet_rmem,
466 .max_header = DN_MAX_NSP_DATA_HEADER + 64,
467 .obj_size = sizeof(struct dn_sock),
1da177e4
LT		 468};
469
1b8d7ae4 470static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
1da177e4
LT		 471{
472 struct dn_scp *scp;
6257ff21 473 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
1da177e4
LT		 474
475 if (!sk)
476 goto out;
477
478 if (sock)
479 sock->ops = &dn_proto_ops;
480 sock_init_data(sock, sk);
481
482 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
483 sk->sk_destruct = dn_destruct;
484 sk->sk_no_check = 1;
485 sk->sk_family = PF_DECnet;
486 sk->sk_protocol = 0;
487 sk->sk_allocation = gfp;
1f12bcc9
SW		 488 sk->sk_sndbuf = sysctl_decnet_wmem[1];
489 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
1da177e4
LT		 490
491 /* Initialization of DECnet Session Control Port */
492 scp = DN_SK(sk);
493 scp->state = DN_O; /* Open */
494 scp->numdat = 1; /* Next data seg to tx */
495 scp->numoth = 1; /* Next oth data to tx */
496 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
497 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
498 scp->ackrcv_dat = 0; /* Highest data ack recv*/
499 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
429eb0fa 500 scp->flowrem_sw = DN_SEND;
1da177e4
LT		 501 scp->flowloc_sw = DN_SEND;
502 scp->flowrem_dat = 0;
503 scp->flowrem_oth = 1;
504 scp->flowloc_dat = 0;
505 scp->flowloc_oth = 1;
506 scp->services_rem = 0;
507 scp->services_loc = 1 | NSP_FC_NONE;
508 scp->info_rem = 0;
509 scp->info_loc = 0x03; /* NSP version 4.1 */
510 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
511 scp->nonagle = 0;
512 scp->multi_ireq = 1;
513 scp->accept_mode = ACC_IMMED;
514 scp->addr.sdn_family = AF_DECnet;
515 scp->peer.sdn_family = AF_DECnet;
516 scp->accessdata.acc_accl = 5;
517 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
518
519 scp->max_window = NSP_MAX_WINDOW;
520 scp->snd_window = NSP_MIN_WINDOW;
521 scp->nsp_srtt = NSP_INITIAL_SRTT;
522 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
523 scp->nsp_rxtshift = 0;
524
525 skb_queue_head_init(&scp->data_xmit_queue);
526 skb_queue_head_init(&scp->other_xmit_queue);
527 skb_queue_head_init(&scp->other_receive_queue);
528
529 scp->persist = 0;
530 scp->persist_fxn = NULL;
531 scp->keepalive = 10 * HZ;
532 scp->keepalive_fxn = dn_keepalive;
533
534 init_timer(&scp->delack_timer);
535 scp->delack_pending = 0;
536 scp->delack_fxn = dn_nsp_delayed_ack;
537
538 dn_start_slow_timer(sk);
539out:
540 return sk;
541}
542
543/*
544 * Keepalive timer.
545 * FIXME: Should respond to SO_KEEPALIVE etc.
546 */
547static void dn_keepalive(struct sock *sk)
548{
549 struct dn_scp *scp = DN_SK(sk);
550
551 /*
552 * By checking the other_data transmit queue is empty
553 * we are double checking that we are not sending too
554 * many of these keepalive frames.
555 */
b03efcfb 556 if (skb_queue_empty(&scp->other_xmit_queue))
1da177e4
LT		 557 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
558}
559
560
561/*
562 * Timer for shutdown/destroyed sockets.
563 * When socket is dead & no packets have been sent for a
564 * certain amount of time, they are removed by this
565 * routine. Also takes care of sending out DI & DC
566 * frames at correct times.
567 */
568int dn_destroy_timer(struct sock *sk)
569{
570 struct dn_scp *scp = DN_SK(sk);
571
572 scp->persist = dn_nsp_persist(sk);
573
06f8fe11
JP		 574 switch (scp->state) {
575 case DN_DI:
576 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
577 if (scp->nsp_rxtshift >= decnet_di_count)
578 scp->state = DN_CN;
579 return 0;
1da177e4 580
06f8fe11
JP		 581 case DN_DR:
582 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
583 if (scp->nsp_rxtshift >= decnet_dr_count)
584 scp->state = DN_DRC;
585 return 0;
1da177e4 586
06f8fe11
JP		 587 case DN_DN:
588 if (scp->nsp_rxtshift < decnet_dn_count) {
589 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
590 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
591 GFP_ATOMIC);
592 return 0;
593 }
1da177e4
LT		 594 }
595
596 scp->persist = (HZ * decnet_time_wait);
597
598 if (sk->sk_socket)
599 return 0;
600
601 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
602 dn_unhash_sock(sk);
603 sock_put(sk);
604 return 1;
605 }
606
607 return 0;
608}
609
610static void dn_destroy_sock(struct sock *sk)
611{
612 struct dn_scp *scp = DN_SK(sk);
613
614 scp->nsp_rxtshift = 0; /* reset back off */
615
616 if (sk->sk_socket) {
617 if (sk->sk_socket->state != SS_UNCONNECTED)
618 sk->sk_socket->state = SS_DISCONNECTING;
619 }
620
621 sk->sk_state = TCP_CLOSE;
622
06f8fe11
JP		 623 switch (scp->state) {
624 case DN_DN:
625 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
626 sk->sk_allocation);
627 scp->persist_fxn = dn_destroy_timer;
628 scp->persist = dn_nsp_persist(sk);
629 break;
630 case DN_CR:
631 scp->state = DN_DR;
632 goto disc_reject;
633 case DN_RUN:
634 scp->state = DN_DI;
635 case DN_DI:
636 case DN_DR:
1da177e4 637disc_reject:
06f8fe11
JP		 638 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
639 case DN_NC:
640 case DN_NR:
641 case DN_RJ:
642 case DN_DIC:
643 case DN_CN:
644 case DN_DRC:
645 case DN_CI:
646 case DN_CD:
647 scp->persist_fxn = dn_destroy_timer;
648 scp->persist = dn_nsp_persist(sk);
649 break;
650 default:
651 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
652 case DN_O:
653 dn_stop_slow_timer(sk);
1da177e4 654
06f8fe11
JP		 655 dn_unhash_sock_bh(sk);
656 sock_put(sk);
1da177e4 657
06f8fe11 658 break;
1da177e4
LT		 659 }
660}
661
c4ea94ab 662char *dn_addr2asc(__u16 addr, char *buf)
1da177e4
LT		 663{
664 unsigned short node, area;
665
666 node = addr & 0x03ff;
667 area = addr >> 10;
668 sprintf(buf, "%hd.%hd", area, node);
669
670 return buf;
671}
672
673
674
3f378b68
EP		 675static int dn_create(struct net *net, struct socket *sock, int protocol,
676 int kern)
1da177e4
LT		 677{
678 struct sock *sk;
679
0b15bc29
HFS		 680 if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
681 return -EINVAL;
682
09ad9bc7 683 if (!net_eq(net, &init_net))
1b8d7ae4
EB		 684 return -EAFNOSUPPORT;
685
06f8fe11
JP		 686 switch (sock->type) {
687 case SOCK_SEQPACKET:
688 if (protocol != DNPROTO_NSP)
689 return -EPROTONOSUPPORT;
690 break;
691 case SOCK_STREAM:
692 break;
693 default:
694 return -ESOCKTNOSUPPORT;
1da177e4
LT		 695 }
696
697
1b8d7ae4 698 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
1da177e4
LT		 699 return -ENOBUFS;
700
701 sk->sk_protocol = protocol;
702
703 return 0;
704}
705
706
707static int
708dn_release(struct socket *sock)
709{
710 struct sock *sk = sock->sk;
711
712 if (sk) {
713 sock_orphan(sk);
714 sock_hold(sk);
715 lock_sock(sk);
716 dn_destroy_sock(sk);
717 release_sock(sk);
718 sock_put(sk);
719 }
720
429eb0fa 721 return 0;
1da177e4
LT		 722}
723
724static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
725{
726 struct sock *sk = sock->sk;
727 struct dn_scp *scp = DN_SK(sk);
728 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
7562f876 729 struct net_device *dev, *ldev;
1da177e4
LT		 730 int rv;
731
732 if (addr_len != sizeof(struct sockaddr_dn))
733 return -EINVAL;
734
735 if (saddr->sdn_family != AF_DECnet)
736 return -EINVAL;
737
c4106aa8 738 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
1da177e4
LT		 739 return -EINVAL;
740
c4106aa8 741 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
1da177e4
LT		 742 return -EINVAL;
743
744 if (saddr->sdn_flags & ~SDF_WILD)
745 return -EINVAL;
746
1da177e4
LT		 747 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
748 (saddr->sdn_flags & SDF_WILD)))
749 return -EACCES;
1da177e4
LT		 750
751 if (!(saddr->sdn_flags & SDF_WILD)) {
c4106aa8 752 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
c6d14c84 753 rcu_read_lock();
7562f876 754 ldev = NULL;
c6d14c84 755 for_each_netdev_rcu(&init_net, dev) {
1da177e4
LT		 756 if (!dev->dn_ptr)
757 continue;
7562f876
PE		 758 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
759 ldev = dev;
1da177e4 760 break;
7562f876 761 }
1da177e4 762 }
c6d14c84 763 rcu_read_unlock();
7562f876 764 if (ldev == NULL)
1da177e4
LT		 765 return -EADDRNOTAVAIL;
766 }
767 }
768
769 rv = -EINVAL;
770 lock_sock(sk);
771 if (sock_flag(sk, SOCK_ZAPPED)) {
772 memcpy(&scp->addr, saddr, addr_len);
773 sock_reset_flag(sk, SOCK_ZAPPED);
774
775 rv = dn_hash_sock(sk);
776 if (rv)
777 sock_set_flag(sk, SOCK_ZAPPED);
778 }
779 release_sock(sk);
780
429eb0fa 781 return rv;
1da177e4
LT		 782}
783
784
785static int dn_auto_bind(struct socket *sock)
786{
787 struct sock *sk = sock->sk;
788 struct dn_scp *scp = DN_SK(sk);
789 int rv;
790
791 sock_reset_flag(sk, SOCK_ZAPPED);
792
793 scp->addr.sdn_flags = 0;
794 scp->addr.sdn_objnum = 0;
795
796 /*
797 * This stuff is to keep compatibility with Eduardo's
798 * patch. I hope I can dispense with it shortly...
799 */
800 if ((scp->accessdata.acc_accl != 0) &&
801 (scp->accessdata.acc_accl <= 12)) {
429eb0fa 802
c4106aa8
HH		 803 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
804 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
1da177e4
LT		 805
806 scp->accessdata.acc_accl = 0;
807 memset(scp->accessdata.acc_acc, 0, 40);
808 }
809 /* End of compatibility stuff */
810
c4106aa8 811 scp->addr.sdn_add.a_len = cpu_to_le16(2);
c4ea94ab 812 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
1da177e4
LT		 813 if (rv == 0) {
814 rv = dn_hash_sock(sk);
815 if (rv)
816 sock_set_flag(sk, SOCK_ZAPPED);
817 }
818
819 return rv;
820}
821
dd0fc66f 822static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
1da177e4
LT		 823{
824 struct dn_scp *scp = DN_SK(sk);
825 DEFINE_WAIT(wait);
826 int err;
827
828 if (scp->state != DN_CR)
829 return -EINVAL;
830
831 scp->state = DN_CC;
0dbaee3b 832 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
1da177e4
LT		 833 dn_send_conn_conf(sk, allocation);
834
aa395145 835 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 836 for(;;) {
837 release_sock(sk);
838 if (scp->state == DN_CC)
839 *timeo = schedule_timeout(*timeo);
840 lock_sock(sk);
841 err = 0;
842 if (scp->state == DN_RUN)
843 break;
844 err = sock_error(sk);
845 if (err)
846 break;
847 err = sock_intr_errno(*timeo);
848 if (signal_pending(current))
849 break;
850 err = -EAGAIN;
851 if (!*timeo)
852 break;
aa395145 853 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 854 }
aa395145 855 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 856 if (err == 0) {
857 sk->sk_socket->state = SS_CONNECTED;
858 } else if (scp->state != DN_CC) {
859 sk->sk_socket->state = SS_UNCONNECTED;
860 }
861 return err;
862}
863
864static int dn_wait_run(struct sock *sk, long *timeo)
865{
866 struct dn_scp *scp = DN_SK(sk);
867 DEFINE_WAIT(wait);
868 int err = 0;
869
870 if (scp->state == DN_RUN)
871 goto out;
872
873 if (!*timeo)
874 return -EALREADY;
875
aa395145 876 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 877 for(;;) {
878 release_sock(sk);
879 if (scp->state == DN_CI || scp->state == DN_CC)
880 *timeo = schedule_timeout(*timeo);
881 lock_sock(sk);
882 err = 0;
883 if (scp->state == DN_RUN)
884 break;
885 err = sock_error(sk);
886 if (err)
887 break;
888 err = sock_intr_errno(*timeo);
889 if (signal_pending(current))
890 break;
891 err = -ETIMEDOUT;
892 if (!*timeo)
893 break;
aa395145 894 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 895 }
aa395145 896 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 897out:
898 if (err == 0) {
899 sk->sk_socket->state = SS_CONNECTED;
900 } else if (scp->state != DN_CI && scp->state != DN_CC) {
901 sk->sk_socket->state = SS_UNCONNECTED;
902 }
903 return err;
904}
905
906static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
907{
908 struct socket *sock = sk->sk_socket;
909 struct dn_scp *scp = DN_SK(sk);
910 int err = -EISCONN;
bef55aeb 911 struct flowidn fld;
cec771d6 912 struct dst_entry *dst;
1da177e4
LT		 913
914 if (sock->state == SS_CONNECTED)
915 goto out;
916
917 if (sock->state == SS_CONNECTING) {
918 err = 0;
919 if (scp->state == DN_RUN) {
920 sock->state = SS_CONNECTED;
921 goto out;
922 }
923 err = -ECONNREFUSED;
924 if (scp->state != DN_CI && scp->state != DN_CC) {
925 sock->state = SS_UNCONNECTED;
926 goto out;
927 }
928 return dn_wait_run(sk, timeo);
929 }
930
931 err = -EINVAL;
932 if (scp->state != DN_O)
933 goto out;
934
935 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
936 goto out;
937 if (addr->sdn_family != AF_DECnet)
938 goto out;
939 if (addr->sdn_flags & SDF_WILD)
940 goto out;
941
942 if (sock_flag(sk, SOCK_ZAPPED)) {
943 err = dn_auto_bind(sk->sk_socket);
944 if (err)
945 goto out;
946 }
947
948 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
949
950 err = -EHOSTUNREACH;
bef55aeb
DM		 951 memset(&fld, 0, sizeof(fld));
952 fld.flowidn_oif = sk->sk_bound_dev_if;
953 fld.daddr = dn_saddr2dn(&scp->peer);
954 fld.saddr = dn_saddr2dn(&scp->addr);
955 dn_sk_ports_copy(&fld, scp);
956 fld.flowidn_proto = DNPROTO_NSP;
957 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
1da177e4 958 goto out;
cec771d6
CW		 959 dst = __sk_dst_get(sk);
960 sk->sk_route_caps = dst->dev->features;
1da177e4
LT		 961 sock->state = SS_CONNECTING;
962 scp->state = DN_CI;
cec771d6 963 scp->segsize_loc = dst_metric_advmss(dst);
1da177e4
LT		 964
965 dn_nsp_send_conninit(sk, NSP_CI);
966 err = -EINPROGRESS;
967 if (*timeo) {
968 err = dn_wait_run(sk, timeo);
969 }
970out:
971 return err;
972}
973
974static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
975{
976 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
977 struct sock *sk = sock->sk;
978 int err;
979 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
980
981 lock_sock(sk);
982 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
983 release_sock(sk);
984
985 return err;
986}
987
988static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
989{
990 struct dn_scp *scp = DN_SK(sk);
991
06f8fe11
JP		 992 switch (scp->state) {
993 case DN_RUN:
994 return 0;
995 case DN_CR:
996 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
997 case DN_CI:
998 case DN_CC:
999 return dn_wait_run(sk, timeo);
1000 case DN_O:
1001 return __dn_connect(sk, addr, addrlen, timeo, flags);
1da177e4
LT		 1002 }
1003
1004 return -EINVAL;
1005}
1006
1007
1008static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1009{
429eb0fa 1010 unsigned char *ptr = skb->data;
1da177e4 1011
429eb0fa
YH		 1012 acc->acc_userl = *ptr++;
1013 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1014 ptr += acc->acc_userl;
1da177e4 1015
429eb0fa
YH		 1016 acc->acc_passl = *ptr++;
1017 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1018 ptr += acc->acc_passl;
1da177e4 1019
429eb0fa
YH		 1020 acc->acc_accl = *ptr++;
1021 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1da177e4 1022
429eb0fa 1023 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1da177e4
LT		 1024
1025}
1026
1027static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1028{
375d9d71
SW		 1029 unsigned char *ptr = skb->data;
1030 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1031
1032 BUG_ON(len > 16); /* we've checked the contents earlier */
c4106aa8 1033 opt->opt_optl = cpu_to_le16(len);
375d9d71
SW		 1034 opt->opt_status = 0;
1035 memcpy(opt->opt_data, ptr, len);
1036 skb_pull(skb, len + 1);
1da177e4
LT		 1037}
1038
1039static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1040{
1041 DEFINE_WAIT(wait);
1042 struct sk_buff *skb = NULL;
1043 int err = 0;
1044
aa395145 1045 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1046 for(;;) {
1047 release_sock(sk);
1048 skb = skb_dequeue(&sk->sk_receive_queue);
1049 if (skb == NULL) {
1050 *timeo = schedule_timeout(*timeo);
1051 skb = skb_dequeue(&sk->sk_receive_queue);
1052 }
1053 lock_sock(sk);
1054 if (skb != NULL)
1055 break;
1056 err = -EINVAL;
1057 if (sk->sk_state != TCP_LISTEN)
1058 break;
1059 err = sock_intr_errno(*timeo);
1060 if (signal_pending(current))
1061 break;
1062 err = -EAGAIN;
1063 if (!*timeo)
1064 break;
aa395145 1065 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 1066 }
aa395145 1067 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1068
1069 return skb == NULL ? ERR_PTR(err) : skb;
1070}
1071
1072static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1073{
1074 struct sock *sk = sock->sk, *newsk;
1075 struct sk_buff *skb = NULL;
1076 struct dn_skb_cb *cb;
1077 unsigned char menuver;
1078 int err = 0;
1079 unsigned char type;
1080 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
adf30907 1081 struct dst_entry *dst;
1da177e4
LT		 1082
1083 lock_sock(sk);
1084
429eb0fa 1085 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1da177e4
LT		 1086 release_sock(sk);
1087 return -EINVAL;
1088 }
1089
1090 skb = skb_dequeue(&sk->sk_receive_queue);
1091 if (skb == NULL) {
1092 skb = dn_wait_for_connect(sk, &timeo);
1093 if (IS_ERR(skb)) {
1094 release_sock(sk);
1095 return PTR_ERR(skb);
1096 }
1097 }
1098
1099 cb = DN_SKB_CB(skb);
1100 sk->sk_ack_backlog--;
3b1e0a65 1101 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1da177e4
LT		 1102 if (newsk == NULL) {
1103 release_sock(sk);
1104 kfree_skb(skb);
1105 return -ENOBUFS;
1106 }
1107 release_sock(sk);
1108
adf30907 1109 dst = skb_dst(skb);
b6c6712a 1110 sk_dst_set(newsk, dst);
adf30907 1111 skb_dst_set(skb, NULL);
1da177e4 1112
429eb0fa 1113 DN_SK(newsk)->state = DN_CR;
1da177e4
LT		 1114 DN_SK(newsk)->addrrem = cb->src_port;
1115 DN_SK(newsk)->services_rem = cb->services;
1116 DN_SK(newsk)->info_rem = cb->info;
1117 DN_SK(newsk)->segsize_rem = cb->segsize;
1118 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
429eb0fa 1119
1da177e4
LT		 1120 if (DN_SK(newsk)->segsize_rem < 230)
1121 DN_SK(newsk)->segsize_rem = 230;
1122
1123 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1124 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1125
1126 newsk->sk_state = TCP_LISTEN;
1127 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1128
1129 /*
1130 * If we are listening on a wild socket, we don't want
1131 * the newly created socket on the wrong hash queue.
1132 */
1133 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1134
1135 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1136 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
c4ea94ab
SW		 1137 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1138 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1da177e4
LT		 1139
1140 menuver = *skb->data;
1141 skb_pull(skb, 1);
1142
1143 if (menuver & DN_MENUVER_ACC)
1144 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1145
1146 if (menuver & DN_MENUVER_USR)
1147 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1148
1149 if (menuver & DN_MENUVER_PRX)
1150 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1151
1152 if (menuver & DN_MENUVER_UIC)
1153 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1154
1155 kfree_skb(skb);
1156
1157 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1158 sizeof(struct optdata_dn));
1159 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1160 sizeof(struct optdata_dn));
1161
1162 lock_sock(newsk);
1163 err = dn_hash_sock(newsk);
1164 if (err == 0) {
1165 sock_reset_flag(newsk, SOCK_ZAPPED);
1166 dn_send_conn_ack(newsk);
1167
1168 /*
429eb0fa
YH		 1169 * Here we use sk->sk_allocation since although the conn conf is
1170 * for the newsk, the context is the old socket.
1171 */
1da177e4
LT		 1172 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1173 err = dn_confirm_accept(newsk, &timeo,
1174 sk->sk_allocation);
1175 }
1176 release_sock(newsk);
429eb0fa 1177 return err;
1da177e4
LT		 1178}
1179
1180
1181static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1182{
1183 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1184 struct sock *sk = sock->sk;
1185 struct dn_scp *scp = DN_SK(sk);
1186
1187 *uaddr_len = sizeof(struct sockaddr_dn);
1188
1189 lock_sock(sk);
1190
1191 if (peer) {
429eb0fa
YH		 1192 if ((sock->state != SS_CONNECTED &&
1193 sock->state != SS_CONNECTING) &&
52c41a32 1194 scp->accept_mode == ACC_IMMED) {
429eb0fa 1195 release_sock(sk);
1da177e4 1196 return -ENOTCONN;
52c41a32 1197 }
1da177e4
LT		 1198
1199 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1200 } else {
1201 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1202 }
1203
1204 release_sock(sk);
1205
429eb0fa 1206 return 0;
1da177e4
LT		 1207}
1208
1209
1210static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1211{
1212 struct sock *sk = sock->sk;
1213 struct dn_scp *scp = DN_SK(sk);
1214 int mask = datagram_poll(file, sock, wait);
1215
b03efcfb 1216 if (!skb_queue_empty(&scp->other_receive_queue))
1da177e4
LT		 1217 mask |= POLLRDBAND;
1218
1219 return mask;
1220}
1221
1222static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1223{
1224 struct sock *sk = sock->sk;
1225 struct dn_scp *scp = DN_SK(sk);
1226 int err = -EOPNOTSUPP;
1227 long amount = 0;
1228 struct sk_buff *skb;
1229 int val;
1230
1231 switch(cmd)
1232 {
1233 case SIOCGIFADDR:
1234 case SIOCSIFADDR:
1235 return dn_dev_ioctl(cmd, (void __user *)arg);
1236
1237 case SIOCATMARK:
1238 lock_sock(sk);
b03efcfb 1239 val = !skb_queue_empty(&scp->other_receive_queue);
1da177e4
LT		 1240 if (scp->state != DN_RUN)
1241 val = -ENOTCONN;
1242 release_sock(sk);
1243 return val;
1244
1245 case TIOCOUTQ:
31e6d363 1246 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1da177e4
LT		 1247 if (amount < 0)
1248 amount = 0;
1249 err = put_user(amount, (int __user *)arg);
1250 break;
1251
1252 case TIOCINQ:
1253 lock_sock(sk);
e57c624b
HE		 1254 skb = skb_peek(&scp->other_receive_queue);
1255 if (skb) {
1da177e4
LT		 1256 amount = skb->len;
1257 } else {
bec571ec 1258 skb_queue_walk(&sk->sk_receive_queue, skb)
1da177e4 1259 amount += skb->len;
1da177e4
LT		 1260 }
1261 release_sock(sk);
1262 err = put_user(amount, (int __user *)arg);
1263 break;
1264
1265 default:
b5e5fa5e 1266 err = -ENOIOCTLCMD;
1da177e4
LT		 1267 break;
1268 }
1269
1270 return err;
1271}
1272
1273static int dn_listen(struct socket *sock, int backlog)
1274{
1275 struct sock *sk = sock->sk;
1276 int err = -EINVAL;
1277
1278 lock_sock(sk);
1279
1280 if (sock_flag(sk, SOCK_ZAPPED))
1281 goto out;
1282
1283 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1284 goto out;
1285
1286 sk->sk_max_ack_backlog = backlog;
1287 sk->sk_ack_backlog = 0;
1288 sk->sk_state = TCP_LISTEN;
1289 err = 0;
1290 dn_rehash_sock(sk);
1291
1292out:
1293 release_sock(sk);
1294
429eb0fa 1295 return err;
1da177e4
LT		 1296}
1297
1298
1299static int dn_shutdown(struct socket *sock, int how)
1300{
1301 struct sock *sk = sock->sk;
1302 struct dn_scp *scp = DN_SK(sk);
1303 int err = -ENOTCONN;
1304
1305 lock_sock(sk);
1306
1307 if (sock->state == SS_UNCONNECTED)
1308 goto out;
1309
1310 err = 0;
1311 if (sock->state == SS_DISCONNECTING)
1312 goto out;
1313
1314 err = -EINVAL;
1315 if (scp->state == DN_O)
1316 goto out;
1317
46b66d70 1318 if (how != SHUT_RDWR)
1da177e4
LT		 1319 goto out;
1320
46b66d70 1321 sk->sk_shutdown = SHUTDOWN_MASK;
1da177e4
LT		 1322 dn_destroy_sock(sk);
1323 err = 0;
1324
1325out:
1326 release_sock(sk);
1327
1328 return err;
1329}
1330
b7058842 1331static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 1332{
1333 struct sock *sk = sock->sk;
1334 int err;
1335
1336 lock_sock(sk);
1337 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1338 release_sock(sk);
1339
1340 return err;
1341}
1342
b7058842 1343static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1da177e4
LT		 1344{
1345 struct sock *sk = sock->sk;
1346 struct dn_scp *scp = DN_SK(sk);
1347 long timeo;
1348 union {
1349 struct optdata_dn opt;
1350 struct accessdata_dn acc;
1351 int mode;
1352 unsigned long win;
1353 int val;
1354 unsigned char services;
1355 unsigned char info;
1356 } u;
1357 int err;
1358
1359 if (optlen && !optval)
1360 return -EINVAL;
1361
1362 if (optlen > sizeof(u))
1363 return -EINVAL;
1364
1365 if (copy_from_user(&u, optval, optlen))
1366 return -EFAULT;
1367
06f8fe11
JP		 1368 switch (optname) {
1369 case DSO_CONDATA:
1370 if (sock->state == SS_CONNECTED)
1371 return -EISCONN;
1372 if ((scp->state != DN_O) && (scp->state != DN_CR))
1373 return -EINVAL;
1da177e4 1374
06f8fe11
JP		 1375 if (optlen != sizeof(struct optdata_dn))
1376 return -EINVAL;
1da177e4 1377
06f8fe11
JP		 1378 if (le16_to_cpu(u.opt.opt_optl) > 16)
1379 return -EINVAL;
1da177e4 1380
06f8fe11
JP		 1381 memcpy(&scp->conndata_out, &u.opt, optlen);
1382 break;
1da177e4 1383
06f8fe11
JP		 1384 case DSO_DISDATA:
1385 if (sock->state != SS_CONNECTED &&
1386 scp->accept_mode == ACC_IMMED)
1387 return -ENOTCONN;
1da177e4 1388
06f8fe11
JP		 1389 if (optlen != sizeof(struct optdata_dn))
1390 return -EINVAL;
1da177e4 1391
06f8fe11
JP		 1392 if (le16_to_cpu(u.opt.opt_optl) > 16)
1393 return -EINVAL;
1da177e4 1394
06f8fe11
JP		 1395 memcpy(&scp->discdata_out, &u.opt, optlen);
1396 break;
1da177e4 1397
06f8fe11
JP		 1398 case DSO_CONACCESS:
1399 if (sock->state == SS_CONNECTED)
1400 return -EISCONN;
1401 if (scp->state != DN_O)
1402 return -EINVAL;
1da177e4 1403
06f8fe11
JP		 1404 if (optlen != sizeof(struct accessdata_dn))
1405 return -EINVAL;
1da177e4 1406
06f8fe11
JP		 1407 if ((u.acc.acc_accl > DN_MAXACCL) ||
1408 (u.acc.acc_passl > DN_MAXACCL) ||
1409 (u.acc.acc_userl > DN_MAXACCL))
1410 return -EINVAL;
1da177e4 1411
06f8fe11
JP		 1412 memcpy(&scp->accessdata, &u.acc, optlen);
1413 break;
1da177e4 1414
06f8fe11
JP		 1415 case DSO_ACCEPTMODE:
1416 if (sock->state == SS_CONNECTED)
1417 return -EISCONN;
1418 if (scp->state != DN_O)
1419 return -EINVAL;
1da177e4 1420
06f8fe11
JP		 1421 if (optlen != sizeof(int))
1422 return -EINVAL;
1da177e4 1423
06f8fe11
JP		 1424 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1425 return -EINVAL;
1da177e4 1426
06f8fe11
JP		 1427 scp->accept_mode = (unsigned char)u.mode;
1428 break;
1da177e4 1429
06f8fe11
JP		 1430 case DSO_CONACCEPT:
1431 if (scp->state != DN_CR)
1432 return -EINVAL;
1433 timeo = sock_rcvtimeo(sk, 0);
1434 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1435 return err;
1da177e4 1436
06f8fe11
JP		 1437 case DSO_CONREJECT:
1438 if (scp->state != DN_CR)
1439 return -EINVAL;
1da177e4 1440
06f8fe11
JP		 1441 scp->state = DN_DR;
1442 sk->sk_shutdown = SHUTDOWN_MASK;
1443 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1444 break;
1da177e4 1445
06f8fe11 1446 default:
1da177e4
LT		 1447#ifdef CONFIG_NETFILTER
1448 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1449#endif
06f8fe11
JP		 1450 case DSO_LINKINFO:
1451 case DSO_STREAM:
1452 case DSO_SEQPACKET:
1453 return -ENOPROTOOPT;
1454
1455 case DSO_MAXWINDOW:
1456 if (optlen != sizeof(unsigned long))
1457 return -EINVAL;
1458 if (u.win > NSP_MAX_WINDOW)
1459 u.win = NSP_MAX_WINDOW;
1460 if (u.win == 0)
1461 return -EINVAL;
1462 scp->max_window = u.win;
1463 if (scp->snd_window > u.win)
1464 scp->snd_window = u.win;
1465 break;
1da177e4 1466
06f8fe11
JP		 1467 case DSO_NODELAY:
1468 if (optlen != sizeof(int))
1469 return -EINVAL;
1470 if (scp->nonagle == 2)
1471 return -EINVAL;
1472 scp->nonagle = (u.val == 0) ? 0 : 1;
1473 /* if (scp->nonagle == 1) { Push pending frames } */
1474 break;
1da177e4 1475
06f8fe11
JP		 1476 case DSO_CORK:
1477 if (optlen != sizeof(int))
1478 return -EINVAL;
1479 if (scp->nonagle == 1)
1480 return -EINVAL;
1481 scp->nonagle = (u.val == 0) ? 0 : 2;
1482 /* if (scp->nonagle == 0) { Push pending frames } */
1483 break;
1da177e4 1484
06f8fe11
JP		 1485 case DSO_SERVICES:
1486 if (optlen != sizeof(unsigned char))
1487 return -EINVAL;
1488 if ((u.services & ~NSP_FC_MASK) != 0x01)
1489 return -EINVAL;
1490 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1491 return -EINVAL;
1492 scp->services_loc = u.services;
1493 break;
1da177e4 1494
06f8fe11
JP		 1495 case DSO_INFO:
1496 if (optlen != sizeof(unsigned char))
1497 return -EINVAL;
1498 if (u.info & 0xfc)
1499 return -EINVAL;
1500 scp->info_loc = u.info;
1501 break;
1da177e4
LT		 1502 }
1503
1504 return 0;
1505}
1506
1507static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1508{
1509 struct sock *sk = sock->sk;
1510 int err;
1511
1512 lock_sock(sk);
1513 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1514 release_sock(sk);
1515
1516 return err;
1517}
1518
1519static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1520{
1521 struct sock *sk = sock->sk;
1522 struct dn_scp *scp = DN_SK(sk);
1523 struct linkinfo_dn link;
1524 unsigned int r_len;
1525 void *r_data = NULL;
1526 unsigned int val;
1527
1528 if(get_user(r_len , optlen))
1529 return -EFAULT;
429eb0fa 1530
06f8fe11
JP		 1531 switch (optname) {
1532 case DSO_CONDATA:
1533 if (r_len > sizeof(struct optdata_dn))
1534 r_len = sizeof(struct optdata_dn);
1535 r_data = &scp->conndata_in;
1536 break;
1da177e4 1537
06f8fe11
JP		 1538 case DSO_DISDATA:
1539 if (r_len > sizeof(struct optdata_dn))
1540 r_len = sizeof(struct optdata_dn);
1541 r_data = &scp->discdata_in;
1542 break;
1da177e4 1543
06f8fe11
JP		 1544 case DSO_CONACCESS:
1545 if (r_len > sizeof(struct accessdata_dn))
1546 r_len = sizeof(struct accessdata_dn);
1547 r_data = &scp->accessdata;
1548 break;
1da177e4 1549
06f8fe11
JP		 1550 case DSO_ACCEPTMODE:
1551 if (r_len > sizeof(unsigned char))
1552 r_len = sizeof(unsigned char);
1553 r_data = &scp->accept_mode;
1554 break;
1da177e4 1555
06f8fe11
JP		 1556 case DSO_LINKINFO:
1557 if (r_len > sizeof(struct linkinfo_dn))
1558 r_len = sizeof(struct linkinfo_dn);
3c6f27bf 1559
06f8fe11 1560 memset(&link, 0, sizeof(link));
1da177e4 1561
06f8fe11
JP		 1562 switch (sock->state) {
1563 case SS_CONNECTING:
1564 link.idn_linkstate = LL_CONNECTING;
1565 break;
1566 case SS_DISCONNECTING:
1567 link.idn_linkstate = LL_DISCONNECTING;
1568 break;
1569 case SS_CONNECTED:
1570 link.idn_linkstate = LL_RUNNING;
1da177e4 1571 break;
1da177e4 1572 default:
06f8fe11
JP		 1573 link.idn_linkstate = LL_INACTIVE;
1574 }
1575
1576 link.idn_segsize = scp->segsize_rem;
1577 r_data = &link;
1578 break;
1579
1580 default:
1da177e4 1581#ifdef CONFIG_NETFILTER
06f8fe11
JP		 1582 {
1583 int ret, len;
429eb0fa 1584
06f8fe11
JP		 1585 if (get_user(len, optlen))
1586 return -EFAULT;
429eb0fa 1587
06f8fe11
JP		 1588 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1589 if (ret >= 0)
1590 ret = put_user(len, optlen);
1591 return ret;
1592 }
1da177e4 1593#endif
06f8fe11
JP		 1594 case DSO_STREAM:
1595 case DSO_SEQPACKET:
1596 case DSO_CONACCEPT:
1597 case DSO_CONREJECT:
1598 return -ENOPROTOOPT;
1599
1600 case DSO_MAXWINDOW:
1601 if (r_len > sizeof(unsigned long))
1602 r_len = sizeof(unsigned long);
1603 r_data = &scp->max_window;
1604 break;
1da177e4 1605
06f8fe11
JP		 1606 case DSO_NODELAY:
1607 if (r_len > sizeof(int))
1608 r_len = sizeof(int);
1609 val = (scp->nonagle == 1);
1610 r_data = &val;
1611 break;
1da177e4 1612
06f8fe11
JP		 1613 case DSO_CORK:
1614 if (r_len > sizeof(int))
1615 r_len = sizeof(int);
1616 val = (scp->nonagle == 2);
1617 r_data = &val;
1618 break;
1da177e4 1619
06f8fe11
JP		 1620 case DSO_SERVICES:
1621 if (r_len > sizeof(unsigned char))
1622 r_len = sizeof(unsigned char);
1623 r_data = &scp->services_rem;
1624 break;
1da177e4 1625
06f8fe11
JP		 1626 case DSO_INFO:
1627 if (r_len > sizeof(unsigned char))
1628 r_len = sizeof(unsigned char);
1629 r_data = &scp->info_rem;
1630 break;
1da177e4
LT		 1631 }
1632
1633 if (r_data) {
1634 if (copy_to_user(optval, r_data, r_len))
1635 return -EFAULT;
1636 if (put_user(r_len, optlen))
1637 return -EFAULT;
1638 }
1639
1640 return 0;
1641}
1642
1643
1644static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1645{
bec571ec 1646 struct sk_buff *skb;
1da177e4
LT		 1647 int len = 0;
1648
1649 if (flags & MSG_OOB)
b03efcfb 1650 return !skb_queue_empty(q) ? 1 : 0;
1da177e4 1651
bec571ec 1652 skb_queue_walk(q, skb) {
1da177e4
LT		 1653 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1654 len += skb->len;
1655
1656 if (cb->nsp_flags & 0x40) {
1657 /* SOCK_SEQPACKET reads to EOM */
1658 if (sk->sk_type == SOCK_SEQPACKET)
1659 return 1;
1660 /* so does SOCK_STREAM unless WAITALL is specified */
1661 if (!(flags & MSG_WAITALL))
1662 return 1;
1663 }
1664
1665 /* minimum data length for read exceeded */
1666 if (len >= target)
1667 return 1;
1da177e4
LT		 1668 }
1669
1670 return 0;
1671}
1672
1673
1674static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1675 struct msghdr *msg, size_t size, int flags)
1676{
1677 struct sock *sk = sock->sk;
1678 struct dn_scp *scp = DN_SK(sk);
1679 struct sk_buff_head *queue = &sk->sk_receive_queue;
1680 size_t target = size > 1 ? 1 : 0;
1681 size_t copied = 0;
1682 int rv = 0;
bec571ec 1683 struct sk_buff *skb, *n;
1da177e4
LT		 1684 struct dn_skb_cb *cb = NULL;
1685 unsigned char eor = 0;
1686 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1687
1688 lock_sock(sk);
1689
1690 if (sock_flag(sk, SOCK_ZAPPED)) {
1691 rv = -EADDRNOTAVAIL;
1692 goto out;
1693 }
1694
1da177e4 1695 if (sk->sk_shutdown & RCV_SHUTDOWN) {
9eb5c94e 1696 rv = 0;
1da177e4
LT		 1697 goto out;
1698 }
1699
9eb5c94e
PC		 1700 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1701 if (rv)
1702 goto out;
1703
c60992db 1704 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1da177e4
LT		 1705 rv = -EOPNOTSUPP;
1706 goto out;
1707 }
1708
1709 if (flags & MSG_OOB)
1710 queue = &scp->other_receive_queue;
1711
1712 if (flags & MSG_WAITALL)
1713 target = size;
1714
1715
1716 /*
1717 * See if there is data ready to read, sleep if there isn't
1718 */
1719 for(;;) {
22196d36
DM		 1720 DEFINE_WAIT(wait);
1721
1da177e4
LT		 1722 if (sk->sk_err)
1723 goto out;
1724
b03efcfb 1725 if (!skb_queue_empty(&scp->other_receive_queue)) {
1da177e4
LT		 1726 if (!(flags & MSG_OOB)) {
1727 msg->msg_flags |= MSG_OOB;
1728 if (!scp->other_report) {
1729 scp->other_report = 1;
1730 goto out;
1731 }
1732 }
1733 }
429eb0fa 1734
1da177e4
LT		 1735 if (scp->state != DN_RUN)
1736 goto out;
1737
1738 if (signal_pending(current)) {
1739 rv = sock_intr_errno(timeo);
1740 goto out;
1741 }
1742
1743 if (dn_data_ready(sk, queue, flags, target))
1744 break;
1745
1746 if (flags & MSG_DONTWAIT) {
1747 rv = -EWOULDBLOCK;
1748 goto out;
1749 }
1750
aa395145 1751 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
22196d36
DM		 1752 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1753 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1754 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1755 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1756 }
1757
bec571ec 1758 skb_queue_walk_safe(queue, skb, n) {
1da177e4
LT		 1759 unsigned int chunk = skb->len;
1760 cb = DN_SKB_CB(skb);
1761
1762 if ((chunk + copied) > size)
1763 chunk = size - copied;
1764
1765 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1766 rv = -EFAULT;
1767 break;
1768 }
1769 copied += chunk;
1770
1771 if (!(flags & MSG_PEEK))
1772 skb_pull(skb, chunk);
1773
1774 eor = cb->nsp_flags & 0x40;
1da177e4
LT		 1775
1776 if (skb->len == 0) {
8728b834 1777 skb_unlink(skb, queue);
1da177e4 1778 kfree_skb(skb);
429eb0fa 1779 /*
1da177e4
LT		 1780 * N.B. Don't refer to skb or cb after this point
1781 * in loop.
1782 */
1783 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1784 scp->flowloc_sw = DN_SEND;
1785 dn_nsp_send_link(sk, DN_SEND, 0);
1786 }
1787 }
1788
429eb0fa 1789 if (eor) {
1da177e4
LT		 1790 if (sk->sk_type == SOCK_SEQPACKET)
1791 break;
1792 if (!(flags & MSG_WAITALL))
1793 break;
1794 }
1795
1796 if (flags & MSG_OOB)
1797 break;
1798
1799 if (copied >= target)
1800 break;
1801 }
1802
1803 rv = copied;
1804
1805
1806 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1807 msg->msg_flags |= MSG_EOR;
1808
1809out:
1810 if (rv == 0)
1811 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1812
1813 if ((rv >= 0) && msg->msg_name) {
1814 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1815 msg->msg_namelen = sizeof(struct sockaddr_dn);
1816 }
1817
1818 release_sock(sk);
1819
1820 return rv;
1821}
1822
1823
1824static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1825{
1826 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1827 if (skb_queue_len(queue) >= scp->snd_window)
1828 return 1;
1829 if (fctype != NSP_FC_NONE) {
1830 if (flags & MSG_OOB) {
1831 if (scp->flowrem_oth == 0)
1832 return 1;
1833 } else {
1834 if (scp->flowrem_dat == 0)
1835 return 1;
1836 }
1837 }
1838 return 0;
1839}
1840
1841/*
59c51591 1842 * The DECnet spec requires that the "routing layer" accepts packets which
1da177e4
LT		 1843 * are at least 230 bytes in size. This excludes any headers which the NSP
1844 * layer might add, so we always assume that we'll be using the maximal
1845 * length header on data packets. The variation in length is due to the
1846 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1847 * make much practical difference.
1848 */
95c96174 1849unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1da177e4 1850{
95c96174 1851 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1da177e4 1852 if (dev) {
fc766e4c 1853 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1da177e4
LT		 1854 mtu -= LL_RESERVED_SPACE(dev);
1855 if (dn_db->use_long)
1856 mtu -= 21;
1857 else
1858 mtu -= 6;
1859 mtu -= DN_MAX_NSP_DATA_HEADER;
1860 } else {
1861 /*
1862 * 21 = long header, 16 = guess at MAC header length
1863 */
1864 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1865 }
1866 if (mtu > mss)
1867 mss = mtu;
1868 return mss;
1869}
1870
1871static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1872{
1873 struct dst_entry *dst = __sk_dst_get(sk);
1874 struct dn_scp *scp = DN_SK(sk);
1875 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1876
1877 /* Other data messages are limited to 16 bytes per packet */
1878 if (flags & MSG_OOB)
1879 return 16;
1880
1881 /* This works out the maximum size of segment we can send out */
1882 if (dst) {
1883 u32 mtu = dst_mtu(dst);
1884 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1885 }
1886
1887 return mss_now;
1888}
1889
429eb0fa 1890/*
12a49ffd
PC		 1891 * N.B. We get the timeout wrong here, but then we always did get it
1892 * wrong before and this is another step along the road to correcting
1893 * it. It ought to get updated each time we pass through the routine,
1894 * but in practise it probably doesn't matter too much for now.
1895 */
1896static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1897 unsigned long datalen, int noblock,
1898 int *errcode)
1899{
1900 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1901 noblock, errcode);
1902 if (skb) {
b98999dc 1903 skb->protocol = htons(ETH_P_DNA_RT);
12a49ffd
PC		 1904 skb->pkt_type = PACKET_OUTGOING;
1905 }
1906 return skb;
1907}
1908
1da177e4 1909static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
12a49ffd 1910 struct msghdr *msg, size_t size)
1da177e4
LT		 1911{
1912 struct sock *sk = sock->sk;
1913 struct dn_scp *scp = DN_SK(sk);
1914 size_t mss;
1915 struct sk_buff_head *queue = &scp->data_xmit_queue;
1916 int flags = msg->msg_flags;
1917 int err = 0;
1918 size_t sent = 0;
1919 int addr_len = msg->msg_namelen;
1920 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1921 struct sk_buff *skb = NULL;
1922 struct dn_skb_cb *cb;
1923 size_t len;
1924 unsigned char fctype;
12a49ffd 1925 long timeo;
1da177e4
LT		 1926
1927 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1928 return -EOPNOTSUPP;
1929
1930 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1931 return -EINVAL;
1932
12a49ffd
PC		 1933 lock_sock(sk);
1934 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1da177e4
LT		 1935 /*
1936 * The only difference between stream sockets and sequenced packet
1937 * sockets is that the stream sockets always behave as if MSG_EOR
1938 * has been set.
1939 */
1940 if (sock->type == SOCK_STREAM) {
12a49ffd
PC		 1941 if (flags & MSG_EOR) {
1942 err = -EINVAL;
1943 goto out;
1944 }
1da177e4
LT		 1945 flags |= MSG_EOR;
1946 }
1947
1da177e4
LT		 1948
1949 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1950 if (err)
1951 goto out_err;
1952
1953 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1954 err = -EPIPE;
9eb5c94e
PC		 1955 if (!(flags & MSG_NOSIGNAL))
1956 send_sig(SIGPIPE, current, 0);
1da177e4
LT		 1957 goto out_err;
1958 }
1959
1960 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
b6c6712a 1961 dst_negative_advice(sk);
1da177e4
LT		 1962
1963 mss = scp->segsize_rem;
1964 fctype = scp->services_rem & NSP_FC_MASK;
1965
1966 mss = dn_current_mss(sk, flags);
1967
1968 if (flags & MSG_OOB) {
1969 queue = &scp->other_xmit_queue;
1970 if (size > mss) {
1971 err = -EMSGSIZE;
1972 goto out;
1973 }
1974 }
1975
1976 scp->persist_fxn = dn_nsp_xmit_timeout;
1977
1978 while(sent < size) {
1979 err = sock_error(sk);
1980 if (err)
1981 goto out;
1982
1983 if (signal_pending(current)) {
1984 err = sock_intr_errno(timeo);
1985 goto out;
1986 }
1987
1988 /*
1989 * Calculate size that we wish to send.
1990 */
1991 len = size - sent;
1992
1993 if (len > mss)
1994 len = mss;
1995
1996 /*
1997 * Wait for queue size to go down below the window
1998 * size.
1999 */
2000 if (dn_queue_too_long(scp, queue, flags)) {
22196d36
DM		 2001 DEFINE_WAIT(wait);
2002
1da177e4
LT		 2003 if (flags & MSG_DONTWAIT) {
2004 err = -EWOULDBLOCK;
2005 goto out;
2006 }
2007
aa395145 2008 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
22196d36
DM		 2009 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2010 sk_wait_event(sk, &timeo,
2011 !dn_queue_too_long(scp, queue, flags));
2012 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 2013 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2014 continue;
2015 }
2016
2017 /*
2018 * Get a suitably sized skb.
12a49ffd
PC		 2019 * 64 is a bit of a hack really, but its larger than any
2020 * link-layer headers and has served us well as a good
2021 * guess as to their real length.
1da177e4 2022 */
12a49ffd
PC		 2023 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2024 flags & MSG_DONTWAIT, &err);
1da177e4
LT		 2025
2026 if (err)
2027 break;
2028
2029 if (!skb)
2030 continue;
2031
2032 cb = DN_SKB_CB(skb);
2033
12a49ffd 2034 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
1da177e4
LT		 2035
2036 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2037 err = -EFAULT;
2038 goto out;
2039 }
2040
2041 if (flags & MSG_OOB) {
2042 cb->nsp_flags = 0x30;
2043 if (fctype != NSP_FC_NONE)
2044 scp->flowrem_oth--;
2045 } else {
2046 cb->nsp_flags = 0x00;
2047 if (scp->seg_total == 0)
2048 cb->nsp_flags |= 0x20;
2049
2050 scp->seg_total += len;
429eb0fa 2051
1da177e4
LT		 2052 if (((sent + len) == size) && (flags & MSG_EOR)) {
2053 cb->nsp_flags |= 0x40;
2054 scp->seg_total = 0;
2055 if (fctype == NSP_FC_SCMC)
2056 scp->flowrem_dat--;
2057 }
2058 if (fctype == NSP_FC_SRC)
2059 scp->flowrem_dat--;
2060 }
2061
2062 sent += len;
2063 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2064 skb = NULL;
2065
2066 scp->persist = dn_nsp_persist(sk);
2067
2068 }
2069out:
2070
db849df6 2071 kfree_skb(skb);
1da177e4
LT		 2072
2073 release_sock(sk);
2074
2075 return sent ? sent : err;
2076
2077out_err:
001ab02a 2078 err = sk_stream_error(sk, flags, err);
1da177e4
LT		 2079 release_sock(sk);
2080 return err;
2081}
2082
2083static int dn_device_event(struct notifier_block *this, unsigned long event,
2084 void *ptr)
2085{
2086 struct net_device *dev = (struct net_device *)ptr;
2087
721499e8 2088 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 2089 return NOTIFY_DONE;
2090
06f8fe11
JP		 2091 switch (event) {
2092 case NETDEV_UP:
2093 dn_dev_up(dev);
2094 break;
2095 case NETDEV_DOWN:
2096 dn_dev_down(dev);
2097 break;
2098 default:
2099 break;
1da177e4
LT		 2100 }
2101
2102 return NOTIFY_DONE;
2103}
2104
2105static struct notifier_block dn_dev_notifier = {
2106 .notifier_call = dn_device_event,
2107};
2108
f2ccd8fa 2109extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
1da177e4 2110
7546dd97 2111static struct packet_type dn_dix_packet_type __read_mostly = {
09640e63 2112 .type = cpu_to_be16(ETH_P_DNA_RT),
1da177e4
LT		 2113 .func = dn_route_rcv,
2114};
2115
2116#ifdef CONFIG_PROC_FS
2117struct dn_iter_state {
2118 int bucket;
2119};
2120
2121static struct sock *dn_socket_get_first(struct seq_file *seq)
2122{
2123 struct dn_iter_state *state = seq->private;
2124 struct sock *n = NULL;
2125
2126 for(state->bucket = 0;
2127 state->bucket < DN_SK_HASH_SIZE;
2128 ++state->bucket) {
2129 n = sk_head(&dn_sk_hash[state->bucket]);
2130 if (n)
2131 break;
2132 }
2133
2134 return n;
2135}
2136
2137static struct sock *dn_socket_get_next(struct seq_file *seq,
2138 struct sock *n)
2139{
2140 struct dn_iter_state *state = seq->private;
2141
2142 n = sk_next(n);
2143try_again:
2144 if (n)
2145 goto out;
2146 if (++state->bucket >= DN_SK_HASH_SIZE)
2147 goto out;
2148 n = sk_head(&dn_sk_hash[state->bucket]);
2149 goto try_again;
2150out:
2151 return n;
2152}
2153
2154static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2155{
2156 struct sock *sk = dn_socket_get_first(seq);
2157
2158 if (sk) {
2159 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2160 --*pos;
2161 }
2162 return *pos ? NULL : sk;
2163}
2164
2165static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2166{
2167 void *rc;
2168 read_lock_bh(&dn_hash_lock);
2169 rc = socket_get_idx(seq, &pos);
2170 if (!rc) {
2171 read_unlock_bh(&dn_hash_lock);
2172 }
2173 return rc;
2174}
2175
2176static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2177{
2178 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2179}
2180
2181static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2182{
2183 void *rc;
2184
2185 if (v == SEQ_START_TOKEN) {
2186 rc = dn_socket_get_idx(seq, 0);
2187 goto out;
2188 }
2189
2190 rc = dn_socket_get_next(seq, v);
2191 if (rc)
2192 goto out;
2193 read_unlock_bh(&dn_hash_lock);
2194out:
2195 ++*pos;
2196 return rc;
2197}
2198
2199static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2200{
2201 if (v && v != SEQ_START_TOKEN)
2202 read_unlock_bh(&dn_hash_lock);
2203}
2204
2205#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2206
2207static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2208{
2209 int i;
429eb0fa 2210
c4106aa8 2211 switch (le16_to_cpu(dn->sdn_objnamel)) {
06f8fe11
JP		 2212 case 0:
2213 sprintf(buf, "%d", dn->sdn_objnum);
2214 break;
2215 default:
2216 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2217 buf[i] = dn->sdn_objname[i];
2218 if (IS_NOT_PRINTABLE(buf[i]))
2219 buf[i] = '.';
2220 }
2221 buf[i] = 0;
429eb0fa 2222 }
1da177e4
LT		 2223}
2224
2225static char *dn_state2asc(unsigned char state)
2226{
06f8fe11
JP		 2227 switch (state) {
2228 case DN_O:
2229 return "OPEN";
2230 case DN_CR:
2231 return " CR";
2232 case DN_DR:
2233 return " DR";
2234 case DN_DRC:
2235 return " DRC";
2236 case DN_CC:
2237 return " CC";
2238 case DN_CI:
2239 return " CI";
2240 case DN_NR:
2241 return " NR";
2242 case DN_NC:
2243 return " NC";
2244 case DN_CD:
2245 return " CD";
2246 case DN_RJ:
2247 return " RJ";
2248 case DN_RUN:
2249 return " RUN";
2250 case DN_DI:
2251 return " DI";
2252 case DN_DIC:
2253 return " DIC";
2254 case DN_DN:
2255 return " DN";
2256 case DN_CL:
2257 return " CL";
2258 case DN_CN:
2259 return " CN";
1da177e4
LT		 2260 }
2261
2262 return "????";
2263}
2264
2265static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2266{
2267 struct dn_scp *scp = DN_SK(sk);
2268 char buf1[DN_ASCBUF_LEN];
2269 char buf2[DN_ASCBUF_LEN];
2270 char local_object[DN_MAXOBJL+3];
2271 char remote_object[DN_MAXOBJL+3];
2272
2273 dn_printable_object(&scp->addr, local_object);
2274 dn_printable_object(&scp->peer, remote_object);
2275
2276 seq_printf(seq,
2277 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2278 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
c4106aa8 2279 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
1da177e4
LT		 2280 scp->addrloc,
2281 scp->numdat,
2282 scp->numoth,
2283 scp->ackxmt_dat,
2284 scp->ackxmt_oth,
2285 scp->flowloc_sw,
2286 local_object,
c4106aa8 2287 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
1da177e4
LT		 2288 scp->addrrem,
2289 scp->numdat_rcv,
2290 scp->numoth_rcv,
2291 scp->ackrcv_dat,
2292 scp->ackrcv_oth,
2293 scp->flowrem_sw,
2294 remote_object,
2295 dn_state2asc(scp->state),
2296 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2297}
2298
2299static int dn_socket_seq_show(struct seq_file *seq, void *v)
2300{
2301 if (v == SEQ_START_TOKEN) {
2302 seq_puts(seq, "Local Remote\n");
2303 } else {
2304 dn_socket_format_entry(seq, v);
2305 }
2306 return 0;
2307}
2308
56b3d975 2309static const struct seq_operations dn_socket_seq_ops = {
1da177e4
LT		 2310 .start = dn_socket_seq_start,
2311 .next = dn_socket_seq_next,
2312 .stop = dn_socket_seq_stop,
2313 .show = dn_socket_seq_show,
2314};
2315
2316static int dn_socket_seq_open(struct inode *inode, struct file *file)
2317{
c20932d2
PE		 2318 return seq_open_private(file, &dn_socket_seq_ops,
2319 sizeof(struct dn_iter_state));
1da177e4
LT		 2320}
2321
9a32144e 2322static const struct file_operations dn_socket_seq_fops = {
1da177e4
LT		 2323 .owner = THIS_MODULE,
2324 .open = dn_socket_seq_open,
2325 .read = seq_read,
2326 .llseek = seq_lseek,
2327 .release = seq_release_private,
2328};
2329#endif
2330
ec1b4cf7 2331static const struct net_proto_family dn_family_ops = {
1da177e4
LT		 2332 .family = AF_DECnet,
2333 .create = dn_create,
2334 .owner = THIS_MODULE,
2335};
2336
90ddc4f0 2337static const struct proto_ops dn_proto_ops = {
1da177e4
LT		 2338 .family = AF_DECnet,
2339 .owner = THIS_MODULE,
2340 .release = dn_release,
2341 .bind = dn_bind,
2342 .connect = dn_connect,
2343 .socketpair = sock_no_socketpair,
2344 .accept = dn_accept,
2345 .getname = dn_getname,
2346 .poll = dn_poll,
2347 .ioctl = dn_ioctl,
2348 .listen = dn_listen,
2349 .shutdown = dn_shutdown,
2350 .setsockopt = dn_setsockopt,
2351 .getsockopt = dn_getsockopt,
2352 .sendmsg = dn_sendmsg,
2353 .recvmsg = dn_recvmsg,
2354 .mmap = sock_no_mmap,
2355 .sendpage = sock_no_sendpage,
2356};
2357
2358void dn_register_sysctl(void);
2359void dn_unregister_sysctl(void);
2360
2361MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2362MODULE_AUTHOR("Linux DECnet Project Team");
2363MODULE_LICENSE("GPL");
2364MODULE_ALIAS_NETPROTO(PF_DECnet);
2365
2366static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2367
2368static int __init decnet_init(void)
2369{
2370 int rc;
2371
429eb0fa 2372 printk(banner);
1da177e4
LT		 2373
2374 rc = proto_register(&dn_proto, 1);
2375 if (rc != 0)
2376 goto out;
2377
2378 dn_neigh_init();
2379 dn_dev_init();
2380 dn_route_init();
2381 dn_fib_init();
2382
2383 sock_register(&dn_family_ops);
2384 dev_add_pack(&dn_dix_packet_type);
2385 register_netdevice_notifier(&dn_dev_notifier);
2386
d4beaa66 2387 proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
1da177e4
LT		 2388 dn_register_sysctl();
2389out:
2390 return rc;
2391
2392}
2393module_init(decnet_init);
2394
2395/*
2396 * Prevent DECnet module unloading until its fixed properly.
2397 * Requires an audit of the code to check for memory leaks and
2398 * initialisation problems etc.
2399 */
2400#if 0
2401static void __exit decnet_exit(void)
2402{
2403 sock_unregister(AF_DECnet);
fa34ddd7 2404 rtnl_unregister_all(PF_DECnet);
1da177e4
LT		 2405 dev_remove_pack(&dn_dix_packet_type);
2406
2407 dn_unregister_sysctl();
2408
2409 unregister_netdevice_notifier(&dn_dev_notifier);
2410
2411 dn_route_cleanup();
2412 dn_dev_cleanup();
2413 dn_neigh_cleanup();
2414 dn_fib_cleanup();
2415
ece31ffd 2416 remove_proc_entry("decnet", init_net.proc_net);
1da177e4
LT		 2417
2418 proto_unregister(&dn_proto);
10e85448
JDB		 2419
2420 rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
1da177e4
LT		 2421}
2422module_exit(decnet_exit);
2423#endif
kernel source for telekom puls (alcatel/mediatek)