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Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[linux.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 <[email protected]>
10 * Patrick Caulfield <[email protected]>
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 [email protected]
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 ([email protected])
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 ([email protected])
72
73 Port to new kernel development version.
74
75Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
76 ([email protected])
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 ([email protected])
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 ([email protected])
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
09ad9bc7 680 if (!net_eq(net, &init_net))
1b8d7ae4
EB		 681 return -EAFNOSUPPORT;
682
06f8fe11
JP		 683 switch (sock->type) {
684 case SOCK_SEQPACKET:
685 if (protocol != DNPROTO_NSP)
686 return -EPROTONOSUPPORT;
687 break;
688 case SOCK_STREAM:
689 break;
690 default:
691 return -ESOCKTNOSUPPORT;
1da177e4
LT		 692 }
693
694
1b8d7ae4 695 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
1da177e4
LT		 696 return -ENOBUFS;
697
698 sk->sk_protocol = protocol;
699
700 return 0;
701}
702
703
704static int
705dn_release(struct socket *sock)
706{
707 struct sock *sk = sock->sk;
708
709 if (sk) {
710 sock_orphan(sk);
711 sock_hold(sk);
712 lock_sock(sk);
713 dn_destroy_sock(sk);
714 release_sock(sk);
715 sock_put(sk);
716 }
717
429eb0fa 718 return 0;
1da177e4
LT		 719}
720
721static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
722{
723 struct sock *sk = sock->sk;
724 struct dn_scp *scp = DN_SK(sk);
725 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
7562f876 726 struct net_device *dev, *ldev;
1da177e4
LT		 727 int rv;
728
729 if (addr_len != sizeof(struct sockaddr_dn))
730 return -EINVAL;
731
732 if (saddr->sdn_family != AF_DECnet)
733 return -EINVAL;
734
c4106aa8 735 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
1da177e4
LT		 736 return -EINVAL;
737
c4106aa8 738 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
1da177e4
LT		 739 return -EINVAL;
740
741 if (saddr->sdn_flags & ~SDF_WILD)
742 return -EINVAL;
743
1da177e4
LT		 744 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
745 (saddr->sdn_flags & SDF_WILD)))
746 return -EACCES;
1da177e4
LT		 747
748 if (!(saddr->sdn_flags & SDF_WILD)) {
c4106aa8 749 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
c6d14c84 750 rcu_read_lock();
7562f876 751 ldev = NULL;
c6d14c84 752 for_each_netdev_rcu(&init_net, dev) {
1da177e4
LT		 753 if (!dev->dn_ptr)
754 continue;
7562f876
PE		 755 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
756 ldev = dev;
1da177e4 757 break;
7562f876 758 }
1da177e4 759 }
c6d14c84 760 rcu_read_unlock();
7562f876 761 if (ldev == NULL)
1da177e4
LT		 762 return -EADDRNOTAVAIL;
763 }
764 }
765
766 rv = -EINVAL;
767 lock_sock(sk);
768 if (sock_flag(sk, SOCK_ZAPPED)) {
769 memcpy(&scp->addr, saddr, addr_len);
770 sock_reset_flag(sk, SOCK_ZAPPED);
771
772 rv = dn_hash_sock(sk);
773 if (rv)
774 sock_set_flag(sk, SOCK_ZAPPED);
775 }
776 release_sock(sk);
777
429eb0fa 778 return rv;
1da177e4
LT		 779}
780
781
782static int dn_auto_bind(struct socket *sock)
783{
784 struct sock *sk = sock->sk;
785 struct dn_scp *scp = DN_SK(sk);
786 int rv;
787
788 sock_reset_flag(sk, SOCK_ZAPPED);
789
790 scp->addr.sdn_flags = 0;
791 scp->addr.sdn_objnum = 0;
792
793 /*
794 * This stuff is to keep compatibility with Eduardo's
795 * patch. I hope I can dispense with it shortly...
796 */
797 if ((scp->accessdata.acc_accl != 0) &&
798 (scp->accessdata.acc_accl <= 12)) {
429eb0fa 799
c4106aa8
HH		 800 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
801 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
1da177e4
LT		 802
803 scp->accessdata.acc_accl = 0;
804 memset(scp->accessdata.acc_acc, 0, 40);
805 }
806 /* End of compatibility stuff */
807
c4106aa8 808 scp->addr.sdn_add.a_len = cpu_to_le16(2);
c4ea94ab 809 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
1da177e4
LT		 810 if (rv == 0) {
811 rv = dn_hash_sock(sk);
812 if (rv)
813 sock_set_flag(sk, SOCK_ZAPPED);
814 }
815
816 return rv;
817}
818
dd0fc66f 819static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
1da177e4
LT		 820{
821 struct dn_scp *scp = DN_SK(sk);
822 DEFINE_WAIT(wait);
823 int err;
824
825 if (scp->state != DN_CR)
826 return -EINVAL;
827
828 scp->state = DN_CC;
0dbaee3b 829 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
1da177e4
LT		 830 dn_send_conn_conf(sk, allocation);
831
aa395145 832 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 833 for(;;) {
834 release_sock(sk);
835 if (scp->state == DN_CC)
836 *timeo = schedule_timeout(*timeo);
837 lock_sock(sk);
838 err = 0;
839 if (scp->state == DN_RUN)
840 break;
841 err = sock_error(sk);
842 if (err)
843 break;
844 err = sock_intr_errno(*timeo);
845 if (signal_pending(current))
846 break;
847 err = -EAGAIN;
848 if (!*timeo)
849 break;
aa395145 850 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 851 }
aa395145 852 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 853 if (err == 0) {
854 sk->sk_socket->state = SS_CONNECTED;
855 } else if (scp->state != DN_CC) {
856 sk->sk_socket->state = SS_UNCONNECTED;
857 }
858 return err;
859}
860
861static int dn_wait_run(struct sock *sk, long *timeo)
862{
863 struct dn_scp *scp = DN_SK(sk);
864 DEFINE_WAIT(wait);
865 int err = 0;
866
867 if (scp->state == DN_RUN)
868 goto out;
869
870 if (!*timeo)
871 return -EALREADY;
872
aa395145 873 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 874 for(;;) {
875 release_sock(sk);
876 if (scp->state == DN_CI || scp->state == DN_CC)
877 *timeo = schedule_timeout(*timeo);
878 lock_sock(sk);
879 err = 0;
880 if (scp->state == DN_RUN)
881 break;
882 err = sock_error(sk);
883 if (err)
884 break;
885 err = sock_intr_errno(*timeo);
886 if (signal_pending(current))
887 break;
888 err = -ETIMEDOUT;
889 if (!*timeo)
890 break;
aa395145 891 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 892 }
aa395145 893 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 894out:
895 if (err == 0) {
896 sk->sk_socket->state = SS_CONNECTED;
897 } else if (scp->state != DN_CI && scp->state != DN_CC) {
898 sk->sk_socket->state = SS_UNCONNECTED;
899 }
900 return err;
901}
902
903static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
904{
905 struct socket *sock = sk->sk_socket;
906 struct dn_scp *scp = DN_SK(sk);
907 int err = -EISCONN;
bef55aeb 908 struct flowidn fld;
cec771d6 909 struct dst_entry *dst;
1da177e4
LT		 910
911 if (sock->state == SS_CONNECTED)
912 goto out;
913
914 if (sock->state == SS_CONNECTING) {
915 err = 0;
916 if (scp->state == DN_RUN) {
917 sock->state = SS_CONNECTED;
918 goto out;
919 }
920 err = -ECONNREFUSED;
921 if (scp->state != DN_CI && scp->state != DN_CC) {
922 sock->state = SS_UNCONNECTED;
923 goto out;
924 }
925 return dn_wait_run(sk, timeo);
926 }
927
928 err = -EINVAL;
929 if (scp->state != DN_O)
930 goto out;
931
932 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
933 goto out;
934 if (addr->sdn_family != AF_DECnet)
935 goto out;
936 if (addr->sdn_flags & SDF_WILD)
937 goto out;
938
939 if (sock_flag(sk, SOCK_ZAPPED)) {
940 err = dn_auto_bind(sk->sk_socket);
941 if (err)
942 goto out;
943 }
944
945 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
946
947 err = -EHOSTUNREACH;
bef55aeb
DM		 948 memset(&fld, 0, sizeof(fld));
949 fld.flowidn_oif = sk->sk_bound_dev_if;
950 fld.daddr = dn_saddr2dn(&scp->peer);
951 fld.saddr = dn_saddr2dn(&scp->addr);
952 dn_sk_ports_copy(&fld, scp);
953 fld.flowidn_proto = DNPROTO_NSP;
954 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
1da177e4 955 goto out;
cec771d6
CW		 956 dst = __sk_dst_get(sk);
957 sk->sk_route_caps = dst->dev->features;
1da177e4
LT		 958 sock->state = SS_CONNECTING;
959 scp->state = DN_CI;
cec771d6 960 scp->segsize_loc = dst_metric_advmss(dst);
1da177e4
LT		 961
962 dn_nsp_send_conninit(sk, NSP_CI);
963 err = -EINPROGRESS;
964 if (*timeo) {
965 err = dn_wait_run(sk, timeo);
966 }
967out:
968 return err;
969}
970
971static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
972{
973 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
974 struct sock *sk = sock->sk;
975 int err;
976 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
977
978 lock_sock(sk);
979 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
980 release_sock(sk);
981
982 return err;
983}
984
985static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
986{
987 struct dn_scp *scp = DN_SK(sk);
988
06f8fe11
JP		 989 switch (scp->state) {
990 case DN_RUN:
991 return 0;
992 case DN_CR:
993 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
994 case DN_CI:
995 case DN_CC:
996 return dn_wait_run(sk, timeo);
997 case DN_O:
998 return __dn_connect(sk, addr, addrlen, timeo, flags);
1da177e4
LT		 999 }
1000
1001 return -EINVAL;
1002}
1003
1004
1005static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1006{
429eb0fa 1007 unsigned char *ptr = skb->data;
1da177e4 1008
429eb0fa
YH		 1009 acc->acc_userl = *ptr++;
1010 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1011 ptr += acc->acc_userl;
1da177e4 1012
429eb0fa
YH		 1013 acc->acc_passl = *ptr++;
1014 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1015 ptr += acc->acc_passl;
1da177e4 1016
429eb0fa
YH		 1017 acc->acc_accl = *ptr++;
1018 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1da177e4 1019
429eb0fa 1020 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1da177e4
LT		 1021
1022}
1023
1024static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1025{
375d9d71
SW		 1026 unsigned char *ptr = skb->data;
1027 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1028
1029 BUG_ON(len > 16); /* we've checked the contents earlier */
c4106aa8 1030 opt->opt_optl = cpu_to_le16(len);
375d9d71
SW		 1031 opt->opt_status = 0;
1032 memcpy(opt->opt_data, ptr, len);
1033 skb_pull(skb, len + 1);
1da177e4
LT		 1034}
1035
1036static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1037{
1038 DEFINE_WAIT(wait);
1039 struct sk_buff *skb = NULL;
1040 int err = 0;
1041
aa395145 1042 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4
LT		 1043 for(;;) {
1044 release_sock(sk);
1045 skb = skb_dequeue(&sk->sk_receive_queue);
1046 if (skb == NULL) {
1047 *timeo = schedule_timeout(*timeo);
1048 skb = skb_dequeue(&sk->sk_receive_queue);
1049 }
1050 lock_sock(sk);
1051 if (skb != NULL)
1052 break;
1053 err = -EINVAL;
1054 if (sk->sk_state != TCP_LISTEN)
1055 break;
1056 err = sock_intr_errno(*timeo);
1057 if (signal_pending(current))
1058 break;
1059 err = -EAGAIN;
1060 if (!*timeo)
1061 break;
aa395145 1062 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1da177e4 1063 }
aa395145 1064 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1065
1066 return skb == NULL ? ERR_PTR(err) : skb;
1067}
1068
1069static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1070{
1071 struct sock *sk = sock->sk, *newsk;
1072 struct sk_buff *skb = NULL;
1073 struct dn_skb_cb *cb;
1074 unsigned char menuver;
1075 int err = 0;
1076 unsigned char type;
1077 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
adf30907 1078 struct dst_entry *dst;
1da177e4
LT		 1079
1080 lock_sock(sk);
1081
429eb0fa 1082 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1da177e4
LT		 1083 release_sock(sk);
1084 return -EINVAL;
1085 }
1086
1087 skb = skb_dequeue(&sk->sk_receive_queue);
1088 if (skb == NULL) {
1089 skb = dn_wait_for_connect(sk, &timeo);
1090 if (IS_ERR(skb)) {
1091 release_sock(sk);
1092 return PTR_ERR(skb);
1093 }
1094 }
1095
1096 cb = DN_SKB_CB(skb);
1097 sk->sk_ack_backlog--;
3b1e0a65 1098 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1da177e4
LT		 1099 if (newsk == NULL) {
1100 release_sock(sk);
1101 kfree_skb(skb);
1102 return -ENOBUFS;
1103 }
1104 release_sock(sk);
1105
adf30907 1106 dst = skb_dst(skb);
b6c6712a 1107 sk_dst_set(newsk, dst);
adf30907 1108 skb_dst_set(skb, NULL);
1da177e4 1109
429eb0fa 1110 DN_SK(newsk)->state = DN_CR;
1da177e4
LT		 1111 DN_SK(newsk)->addrrem = cb->src_port;
1112 DN_SK(newsk)->services_rem = cb->services;
1113 DN_SK(newsk)->info_rem = cb->info;
1114 DN_SK(newsk)->segsize_rem = cb->segsize;
1115 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
429eb0fa 1116
1da177e4
LT		 1117 if (DN_SK(newsk)->segsize_rem < 230)
1118 DN_SK(newsk)->segsize_rem = 230;
1119
1120 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1121 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1122
1123 newsk->sk_state = TCP_LISTEN;
1124 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1125
1126 /*
1127 * If we are listening on a wild socket, we don't want
1128 * the newly created socket on the wrong hash queue.
1129 */
1130 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1131
1132 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1133 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
c4ea94ab
SW		 1134 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1135 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1da177e4
LT		 1136
1137 menuver = *skb->data;
1138 skb_pull(skb, 1);
1139
1140 if (menuver & DN_MENUVER_ACC)
1141 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1142
1143 if (menuver & DN_MENUVER_USR)
1144 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1145
1146 if (menuver & DN_MENUVER_PRX)
1147 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1148
1149 if (menuver & DN_MENUVER_UIC)
1150 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1151
1152 kfree_skb(skb);
1153
1154 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1155 sizeof(struct optdata_dn));
1156 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1157 sizeof(struct optdata_dn));
1158
1159 lock_sock(newsk);
1160 err = dn_hash_sock(newsk);
1161 if (err == 0) {
1162 sock_reset_flag(newsk, SOCK_ZAPPED);
1163 dn_send_conn_ack(newsk);
1164
1165 /*
429eb0fa
YH		 1166 * Here we use sk->sk_allocation since although the conn conf is
1167 * for the newsk, the context is the old socket.
1168 */
1da177e4
LT		 1169 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1170 err = dn_confirm_accept(newsk, &timeo,
1171 sk->sk_allocation);
1172 }
1173 release_sock(newsk);
429eb0fa 1174 return err;
1da177e4
LT		 1175}
1176
1177
1178static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1179{
1180 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1181 struct sock *sk = sock->sk;
1182 struct dn_scp *scp = DN_SK(sk);
1183
1184 *uaddr_len = sizeof(struct sockaddr_dn);
1185
1186 lock_sock(sk);
1187
1188 if (peer) {
429eb0fa
YH		 1189 if ((sock->state != SS_CONNECTED &&
1190 sock->state != SS_CONNECTING) &&
52c41a32 1191 scp->accept_mode == ACC_IMMED) {
429eb0fa 1192 release_sock(sk);
1da177e4 1193 return -ENOTCONN;
52c41a32 1194 }
1da177e4
LT		 1195
1196 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1197 } else {
1198 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1199 }
1200
1201 release_sock(sk);
1202
429eb0fa 1203 return 0;
1da177e4
LT		 1204}
1205
1206
1207static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1208{
1209 struct sock *sk = sock->sk;
1210 struct dn_scp *scp = DN_SK(sk);
1211 int mask = datagram_poll(file, sock, wait);
1212
b03efcfb 1213 if (!skb_queue_empty(&scp->other_receive_queue))
1da177e4
LT		 1214 mask |= POLLRDBAND;
1215
1216 return mask;
1217}
1218
1219static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1220{
1221 struct sock *sk = sock->sk;
1222 struct dn_scp *scp = DN_SK(sk);
1223 int err = -EOPNOTSUPP;
1224 long amount = 0;
1225 struct sk_buff *skb;
1226 int val;
1227
1228 switch(cmd)
1229 {
1230 case SIOCGIFADDR:
1231 case SIOCSIFADDR:
1232 return dn_dev_ioctl(cmd, (void __user *)arg);
1233
1234 case SIOCATMARK:
1235 lock_sock(sk);
b03efcfb 1236 val = !skb_queue_empty(&scp->other_receive_queue);
1da177e4
LT		 1237 if (scp->state != DN_RUN)
1238 val = -ENOTCONN;
1239 release_sock(sk);
1240 return val;
1241
1242 case TIOCOUTQ:
31e6d363 1243 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1da177e4
LT		 1244 if (amount < 0)
1245 amount = 0;
1246 err = put_user(amount, (int __user *)arg);
1247 break;
1248
1249 case TIOCINQ:
1250 lock_sock(sk);
e57c624b
HE		 1251 skb = skb_peek(&scp->other_receive_queue);
1252 if (skb) {
1da177e4
LT		 1253 amount = skb->len;
1254 } else {
bec571ec 1255 skb_queue_walk(&sk->sk_receive_queue, skb)
1da177e4 1256 amount += skb->len;
1da177e4
LT		 1257 }
1258 release_sock(sk);
1259 err = put_user(amount, (int __user *)arg);
1260 break;
1261
1262 default:
b5e5fa5e 1263 err = -ENOIOCTLCMD;
1da177e4
LT		 1264 break;
1265 }
1266
1267 return err;
1268}
1269
1270static int dn_listen(struct socket *sock, int backlog)
1271{
1272 struct sock *sk = sock->sk;
1273 int err = -EINVAL;
1274
1275 lock_sock(sk);
1276
1277 if (sock_flag(sk, SOCK_ZAPPED))
1278 goto out;
1279
1280 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1281 goto out;
1282
1283 sk->sk_max_ack_backlog = backlog;
1284 sk->sk_ack_backlog = 0;
1285 sk->sk_state = TCP_LISTEN;
1286 err = 0;
1287 dn_rehash_sock(sk);
1288
1289out:
1290 release_sock(sk);
1291
429eb0fa 1292 return err;
1da177e4
LT		 1293}
1294
1295
1296static int dn_shutdown(struct socket *sock, int how)
1297{
1298 struct sock *sk = sock->sk;
1299 struct dn_scp *scp = DN_SK(sk);
1300 int err = -ENOTCONN;
1301
1302 lock_sock(sk);
1303
1304 if (sock->state == SS_UNCONNECTED)
1305 goto out;
1306
1307 err = 0;
1308 if (sock->state == SS_DISCONNECTING)
1309 goto out;
1310
1311 err = -EINVAL;
1312 if (scp->state == DN_O)
1313 goto out;
1314
46b66d70 1315 if (how != SHUT_RDWR)
1da177e4
LT		 1316 goto out;
1317
46b66d70 1318 sk->sk_shutdown = SHUTDOWN_MASK;
1da177e4
LT		 1319 dn_destroy_sock(sk);
1320 err = 0;
1321
1322out:
1323 release_sock(sk);
1324
1325 return err;
1326}
1327
b7058842 1328static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 1329{
1330 struct sock *sk = sock->sk;
1331 int err;
1332
1333 lock_sock(sk);
1334 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1335 release_sock(sk);
1336
1337 return err;
1338}
1339
b7058842 1340static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1da177e4
LT		 1341{
1342 struct sock *sk = sock->sk;
1343 struct dn_scp *scp = DN_SK(sk);
1344 long timeo;
1345 union {
1346 struct optdata_dn opt;
1347 struct accessdata_dn acc;
1348 int mode;
1349 unsigned long win;
1350 int val;
1351 unsigned char services;
1352 unsigned char info;
1353 } u;
1354 int err;
1355
1356 if (optlen && !optval)
1357 return -EINVAL;
1358
1359 if (optlen > sizeof(u))
1360 return -EINVAL;
1361
1362 if (copy_from_user(&u, optval, optlen))
1363 return -EFAULT;
1364
06f8fe11
JP		 1365 switch (optname) {
1366 case DSO_CONDATA:
1367 if (sock->state == SS_CONNECTED)
1368 return -EISCONN;
1369 if ((scp->state != DN_O) && (scp->state != DN_CR))
1370 return -EINVAL;
1da177e4 1371
06f8fe11
JP		 1372 if (optlen != sizeof(struct optdata_dn))
1373 return -EINVAL;
1da177e4 1374
06f8fe11
JP		 1375 if (le16_to_cpu(u.opt.opt_optl) > 16)
1376 return -EINVAL;
1da177e4 1377
06f8fe11
JP		 1378 memcpy(&scp->conndata_out, &u.opt, optlen);
1379 break;
1da177e4 1380
06f8fe11
JP		 1381 case DSO_DISDATA:
1382 if (sock->state != SS_CONNECTED &&
1383 scp->accept_mode == ACC_IMMED)
1384 return -ENOTCONN;
1da177e4 1385
06f8fe11
JP		 1386 if (optlen != sizeof(struct optdata_dn))
1387 return -EINVAL;
1da177e4 1388
06f8fe11
JP		 1389 if (le16_to_cpu(u.opt.opt_optl) > 16)
1390 return -EINVAL;
1da177e4 1391
06f8fe11
JP		 1392 memcpy(&scp->discdata_out, &u.opt, optlen);
1393 break;
1da177e4 1394
06f8fe11
JP		 1395 case DSO_CONACCESS:
1396 if (sock->state == SS_CONNECTED)
1397 return -EISCONN;
1398 if (scp->state != DN_O)
1399 return -EINVAL;
1da177e4 1400
06f8fe11
JP		 1401 if (optlen != sizeof(struct accessdata_dn))
1402 return -EINVAL;
1da177e4 1403
06f8fe11
JP		 1404 if ((u.acc.acc_accl > DN_MAXACCL) ||
1405 (u.acc.acc_passl > DN_MAXACCL) ||
1406 (u.acc.acc_userl > DN_MAXACCL))
1407 return -EINVAL;
1da177e4 1408
06f8fe11
JP		 1409 memcpy(&scp->accessdata, &u.acc, optlen);
1410 break;
1da177e4 1411
06f8fe11
JP		 1412 case DSO_ACCEPTMODE:
1413 if (sock->state == SS_CONNECTED)
1414 return -EISCONN;
1415 if (scp->state != DN_O)
1416 return -EINVAL;
1da177e4 1417
06f8fe11
JP		 1418 if (optlen != sizeof(int))
1419 return -EINVAL;
1da177e4 1420
06f8fe11
JP		 1421 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1422 return -EINVAL;
1da177e4 1423
06f8fe11
JP		 1424 scp->accept_mode = (unsigned char)u.mode;
1425 break;
1da177e4 1426
06f8fe11
JP		 1427 case DSO_CONACCEPT:
1428 if (scp->state != DN_CR)
1429 return -EINVAL;
1430 timeo = sock_rcvtimeo(sk, 0);
1431 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1432 return err;
1da177e4 1433
06f8fe11
JP		 1434 case DSO_CONREJECT:
1435 if (scp->state != DN_CR)
1436 return -EINVAL;
1da177e4 1437
06f8fe11
JP		 1438 scp->state = DN_DR;
1439 sk->sk_shutdown = SHUTDOWN_MASK;
1440 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1441 break;
1da177e4 1442
06f8fe11 1443 default:
1da177e4
LT		 1444#ifdef CONFIG_NETFILTER
1445 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1446#endif
06f8fe11
JP		 1447 case DSO_LINKINFO:
1448 case DSO_STREAM:
1449 case DSO_SEQPACKET:
1450 return -ENOPROTOOPT;
1451
1452 case DSO_MAXWINDOW:
1453 if (optlen != sizeof(unsigned long))
1454 return -EINVAL;
1455 if (u.win > NSP_MAX_WINDOW)
1456 u.win = NSP_MAX_WINDOW;
1457 if (u.win == 0)
1458 return -EINVAL;
1459 scp->max_window = u.win;
1460 if (scp->snd_window > u.win)
1461 scp->snd_window = u.win;
1462 break;
1da177e4 1463
06f8fe11
JP		 1464 case DSO_NODELAY:
1465 if (optlen != sizeof(int))
1466 return -EINVAL;
1467 if (scp->nonagle == 2)
1468 return -EINVAL;
1469 scp->nonagle = (u.val == 0) ? 0 : 1;
1470 /* if (scp->nonagle == 1) { Push pending frames } */
1471 break;
1da177e4 1472
06f8fe11
JP		 1473 case DSO_CORK:
1474 if (optlen != sizeof(int))
1475 return -EINVAL;
1476 if (scp->nonagle == 1)
1477 return -EINVAL;
1478 scp->nonagle = (u.val == 0) ? 0 : 2;
1479 /* if (scp->nonagle == 0) { Push pending frames } */
1480 break;
1da177e4 1481
06f8fe11
JP		 1482 case DSO_SERVICES:
1483 if (optlen != sizeof(unsigned char))
1484 return -EINVAL;
1485 if ((u.services & ~NSP_FC_MASK) != 0x01)
1486 return -EINVAL;
1487 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1488 return -EINVAL;
1489 scp->services_loc = u.services;
1490 break;
1da177e4 1491
06f8fe11
JP		 1492 case DSO_INFO:
1493 if (optlen != sizeof(unsigned char))
1494 return -EINVAL;
1495 if (u.info & 0xfc)
1496 return -EINVAL;
1497 scp->info_loc = u.info;
1498 break;
1da177e4
LT		 1499 }
1500
1501 return 0;
1502}
1503
1504static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1505{
1506 struct sock *sk = sock->sk;
1507 int err;
1508
1509 lock_sock(sk);
1510 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1511 release_sock(sk);
1512
1513 return err;
1514}
1515
1516static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1517{
1518 struct sock *sk = sock->sk;
1519 struct dn_scp *scp = DN_SK(sk);
1520 struct linkinfo_dn link;
1521 unsigned int r_len;
1522 void *r_data = NULL;
1523 unsigned int val;
1524
1525 if(get_user(r_len , optlen))
1526 return -EFAULT;
429eb0fa 1527
06f8fe11
JP		 1528 switch (optname) {
1529 case DSO_CONDATA:
1530 if (r_len > sizeof(struct optdata_dn))
1531 r_len = sizeof(struct optdata_dn);
1532 r_data = &scp->conndata_in;
1533 break;
1da177e4 1534
06f8fe11
JP		 1535 case DSO_DISDATA:
1536 if (r_len > sizeof(struct optdata_dn))
1537 r_len = sizeof(struct optdata_dn);
1538 r_data = &scp->discdata_in;
1539 break;
1da177e4 1540
06f8fe11
JP		 1541 case DSO_CONACCESS:
1542 if (r_len > sizeof(struct accessdata_dn))
1543 r_len = sizeof(struct accessdata_dn);
1544 r_data = &scp->accessdata;
1545 break;
1da177e4 1546
06f8fe11
JP		 1547 case DSO_ACCEPTMODE:
1548 if (r_len > sizeof(unsigned char))
1549 r_len = sizeof(unsigned char);
1550 r_data = &scp->accept_mode;
1551 break;
1da177e4 1552
06f8fe11
JP		 1553 case DSO_LINKINFO:
1554 if (r_len > sizeof(struct linkinfo_dn))
1555 r_len = sizeof(struct linkinfo_dn);
3c6f27bf 1556
06f8fe11 1557 memset(&link, 0, sizeof(link));
1da177e4 1558
06f8fe11
JP		 1559 switch (sock->state) {
1560 case SS_CONNECTING:
1561 link.idn_linkstate = LL_CONNECTING;
1562 break;
1563 case SS_DISCONNECTING:
1564 link.idn_linkstate = LL_DISCONNECTING;
1565 break;
1566 case SS_CONNECTED:
1567 link.idn_linkstate = LL_RUNNING;
1da177e4 1568 break;
1da177e4 1569 default:
06f8fe11
JP		 1570 link.idn_linkstate = LL_INACTIVE;
1571 }
1572
1573 link.idn_segsize = scp->segsize_rem;
1574 r_data = &link;
1575 break;
1576
1577 default:
1da177e4 1578#ifdef CONFIG_NETFILTER
06f8fe11
JP		 1579 {
1580 int ret, len;
429eb0fa 1581
06f8fe11
JP		 1582 if (get_user(len, optlen))
1583 return -EFAULT;
429eb0fa 1584
06f8fe11
JP		 1585 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1586 if (ret >= 0)
1587 ret = put_user(len, optlen);
1588 return ret;
1589 }
1da177e4 1590#endif
06f8fe11
JP		 1591 case DSO_STREAM:
1592 case DSO_SEQPACKET:
1593 case DSO_CONACCEPT:
1594 case DSO_CONREJECT:
1595 return -ENOPROTOOPT;
1596
1597 case DSO_MAXWINDOW:
1598 if (r_len > sizeof(unsigned long))
1599 r_len = sizeof(unsigned long);
1600 r_data = &scp->max_window;
1601 break;
1da177e4 1602
06f8fe11
JP		 1603 case DSO_NODELAY:
1604 if (r_len > sizeof(int))
1605 r_len = sizeof(int);
1606 val = (scp->nonagle == 1);
1607 r_data = &val;
1608 break;
1da177e4 1609
06f8fe11
JP		 1610 case DSO_CORK:
1611 if (r_len > sizeof(int))
1612 r_len = sizeof(int);
1613 val = (scp->nonagle == 2);
1614 r_data = &val;
1615 break;
1da177e4 1616
06f8fe11
JP		 1617 case DSO_SERVICES:
1618 if (r_len > sizeof(unsigned char))
1619 r_len = sizeof(unsigned char);
1620 r_data = &scp->services_rem;
1621 break;
1da177e4 1622
06f8fe11
JP		 1623 case DSO_INFO:
1624 if (r_len > sizeof(unsigned char))
1625 r_len = sizeof(unsigned char);
1626 r_data = &scp->info_rem;
1627 break;
1da177e4
LT		 1628 }
1629
1630 if (r_data) {
1631 if (copy_to_user(optval, r_data, r_len))
1632 return -EFAULT;
1633 if (put_user(r_len, optlen))
1634 return -EFAULT;
1635 }
1636
1637 return 0;
1638}
1639
1640
1641static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1642{
bec571ec 1643 struct sk_buff *skb;
1da177e4
LT		 1644 int len = 0;
1645
1646 if (flags & MSG_OOB)
b03efcfb 1647 return !skb_queue_empty(q) ? 1 : 0;
1da177e4 1648
bec571ec 1649 skb_queue_walk(q, skb) {
1da177e4
LT		 1650 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1651 len += skb->len;
1652
1653 if (cb->nsp_flags & 0x40) {
1654 /* SOCK_SEQPACKET reads to EOM */
1655 if (sk->sk_type == SOCK_SEQPACKET)
1656 return 1;
1657 /* so does SOCK_STREAM unless WAITALL is specified */
1658 if (!(flags & MSG_WAITALL))
1659 return 1;
1660 }
1661
1662 /* minimum data length for read exceeded */
1663 if (len >= target)
1664 return 1;
1da177e4
LT		 1665 }
1666
1667 return 0;
1668}
1669
1670
1671static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1672 struct msghdr *msg, size_t size, int flags)
1673{
1674 struct sock *sk = sock->sk;
1675 struct dn_scp *scp = DN_SK(sk);
1676 struct sk_buff_head *queue = &sk->sk_receive_queue;
1677 size_t target = size > 1 ? 1 : 0;
1678 size_t copied = 0;
1679 int rv = 0;
bec571ec 1680 struct sk_buff *skb, *n;
1da177e4
LT		 1681 struct dn_skb_cb *cb = NULL;
1682 unsigned char eor = 0;
1683 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1684
1685 lock_sock(sk);
1686
1687 if (sock_flag(sk, SOCK_ZAPPED)) {
1688 rv = -EADDRNOTAVAIL;
1689 goto out;
1690 }
1691
1da177e4 1692 if (sk->sk_shutdown & RCV_SHUTDOWN) {
9eb5c94e 1693 rv = 0;
1da177e4
LT		 1694 goto out;
1695 }
1696
9eb5c94e
PC		 1697 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1698 if (rv)
1699 goto out;
1700
c60992db 1701 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1da177e4
LT		 1702 rv = -EOPNOTSUPP;
1703 goto out;
1704 }
1705
1706 if (flags & MSG_OOB)
1707 queue = &scp->other_receive_queue;
1708
1709 if (flags & MSG_WAITALL)
1710 target = size;
1711
1712
1713 /*
1714 * See if there is data ready to read, sleep if there isn't
1715 */
1716 for(;;) {
22196d36
DM		 1717 DEFINE_WAIT(wait);
1718
1da177e4
LT		 1719 if (sk->sk_err)
1720 goto out;
1721
b03efcfb 1722 if (!skb_queue_empty(&scp->other_receive_queue)) {
1da177e4
LT		 1723 if (!(flags & MSG_OOB)) {
1724 msg->msg_flags |= MSG_OOB;
1725 if (!scp->other_report) {
1726 scp->other_report = 1;
1727 goto out;
1728 }
1729 }
1730 }
429eb0fa 1731
1da177e4
LT		 1732 if (scp->state != DN_RUN)
1733 goto out;
1734
1735 if (signal_pending(current)) {
1736 rv = sock_intr_errno(timeo);
1737 goto out;
1738 }
1739
1740 if (dn_data_ready(sk, queue, flags, target))
1741 break;
1742
1743 if (flags & MSG_DONTWAIT) {
1744 rv = -EWOULDBLOCK;
1745 goto out;
1746 }
1747
aa395145 1748 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
22196d36
DM		 1749 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1750 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1751 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 1752 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 1753 }
1754
bec571ec 1755 skb_queue_walk_safe(queue, skb, n) {
1da177e4
LT		 1756 unsigned int chunk = skb->len;
1757 cb = DN_SKB_CB(skb);
1758
1759 if ((chunk + copied) > size)
1760 chunk = size - copied;
1761
1762 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1763 rv = -EFAULT;
1764 break;
1765 }
1766 copied += chunk;
1767
1768 if (!(flags & MSG_PEEK))
1769 skb_pull(skb, chunk);
1770
1771 eor = cb->nsp_flags & 0x40;
1da177e4
LT		 1772
1773 if (skb->len == 0) {
8728b834 1774 skb_unlink(skb, queue);
1da177e4 1775 kfree_skb(skb);
429eb0fa 1776 /*
1da177e4
LT		 1777 * N.B. Don't refer to skb or cb after this point
1778 * in loop.
1779 */
1780 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1781 scp->flowloc_sw = DN_SEND;
1782 dn_nsp_send_link(sk, DN_SEND, 0);
1783 }
1784 }
1785
429eb0fa 1786 if (eor) {
1da177e4
LT		 1787 if (sk->sk_type == SOCK_SEQPACKET)
1788 break;
1789 if (!(flags & MSG_WAITALL))
1790 break;
1791 }
1792
1793 if (flags & MSG_OOB)
1794 break;
1795
1796 if (copied >= target)
1797 break;
1798 }
1799
1800 rv = copied;
1801
1802
1803 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1804 msg->msg_flags |= MSG_EOR;
1805
1806out:
1807 if (rv == 0)
1808 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1809
1810 if ((rv >= 0) && msg->msg_name) {
1811 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1812 msg->msg_namelen = sizeof(struct sockaddr_dn);
1813 }
1814
1815 release_sock(sk);
1816
1817 return rv;
1818}
1819
1820
1821static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1822{
1823 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1824 if (skb_queue_len(queue) >= scp->snd_window)
1825 return 1;
1826 if (fctype != NSP_FC_NONE) {
1827 if (flags & MSG_OOB) {
1828 if (scp->flowrem_oth == 0)
1829 return 1;
1830 } else {
1831 if (scp->flowrem_dat == 0)
1832 return 1;
1833 }
1834 }
1835 return 0;
1836}
1837
1838/*
59c51591 1839 * The DECnet spec requires that the "routing layer" accepts packets which
1da177e4
LT		 1840 * are at least 230 bytes in size. This excludes any headers which the NSP
1841 * layer might add, so we always assume that we'll be using the maximal
1842 * length header on data packets. The variation in length is due to the
1843 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1844 * make much practical difference.
1845 */
95c96174 1846unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1da177e4 1847{
95c96174 1848 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1da177e4 1849 if (dev) {
fc766e4c 1850 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1da177e4
LT		 1851 mtu -= LL_RESERVED_SPACE(dev);
1852 if (dn_db->use_long)
1853 mtu -= 21;
1854 else
1855 mtu -= 6;
1856 mtu -= DN_MAX_NSP_DATA_HEADER;
1857 } else {
1858 /*
1859 * 21 = long header, 16 = guess at MAC header length
1860 */
1861 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1862 }
1863 if (mtu > mss)
1864 mss = mtu;
1865 return mss;
1866}
1867
1868static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1869{
1870 struct dst_entry *dst = __sk_dst_get(sk);
1871 struct dn_scp *scp = DN_SK(sk);
1872 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1873
1874 /* Other data messages are limited to 16 bytes per packet */
1875 if (flags & MSG_OOB)
1876 return 16;
1877
1878 /* This works out the maximum size of segment we can send out */
1879 if (dst) {
1880 u32 mtu = dst_mtu(dst);
1881 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1882 }
1883
1884 return mss_now;
1885}
1886
429eb0fa 1887/*
12a49ffd
PC		 1888 * N.B. We get the timeout wrong here, but then we always did get it
1889 * wrong before and this is another step along the road to correcting
1890 * it. It ought to get updated each time we pass through the routine,
1891 * but in practise it probably doesn't matter too much for now.
1892 */
1893static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1894 unsigned long datalen, int noblock,
1895 int *errcode)
1896{
1897 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1898 noblock, errcode);
1899 if (skb) {
b98999dc 1900 skb->protocol = htons(ETH_P_DNA_RT);
12a49ffd
PC		 1901 skb->pkt_type = PACKET_OUTGOING;
1902 }
1903 return skb;
1904}
1905
1da177e4 1906static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
12a49ffd 1907 struct msghdr *msg, size_t size)
1da177e4
LT		 1908{
1909 struct sock *sk = sock->sk;
1910 struct dn_scp *scp = DN_SK(sk);
1911 size_t mss;
1912 struct sk_buff_head *queue = &scp->data_xmit_queue;
1913 int flags = msg->msg_flags;
1914 int err = 0;
1915 size_t sent = 0;
1916 int addr_len = msg->msg_namelen;
1917 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1918 struct sk_buff *skb = NULL;
1919 struct dn_skb_cb *cb;
1920 size_t len;
1921 unsigned char fctype;
12a49ffd 1922 long timeo;
1da177e4
LT		 1923
1924 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1925 return -EOPNOTSUPP;
1926
1927 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1928 return -EINVAL;
1929
12a49ffd
PC		 1930 lock_sock(sk);
1931 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1da177e4
LT		 1932 /*
1933 * The only difference between stream sockets and sequenced packet
1934 * sockets is that the stream sockets always behave as if MSG_EOR
1935 * has been set.
1936 */
1937 if (sock->type == SOCK_STREAM) {
12a49ffd
PC		 1938 if (flags & MSG_EOR) {
1939 err = -EINVAL;
1940 goto out;
1941 }
1da177e4
LT		 1942 flags |= MSG_EOR;
1943 }
1944
1da177e4
LT		 1945
1946 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1947 if (err)
1948 goto out_err;
1949
1950 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1951 err = -EPIPE;
9eb5c94e
PC		 1952 if (!(flags & MSG_NOSIGNAL))
1953 send_sig(SIGPIPE, current, 0);
1da177e4
LT		 1954 goto out_err;
1955 }
1956
1957 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
b6c6712a 1958 dst_negative_advice(sk);
1da177e4
LT		 1959
1960 mss = scp->segsize_rem;
1961 fctype = scp->services_rem & NSP_FC_MASK;
1962
1963 mss = dn_current_mss(sk, flags);
1964
1965 if (flags & MSG_OOB) {
1966 queue = &scp->other_xmit_queue;
1967 if (size > mss) {
1968 err = -EMSGSIZE;
1969 goto out;
1970 }
1971 }
1972
1973 scp->persist_fxn = dn_nsp_xmit_timeout;
1974
1975 while(sent < size) {
1976 err = sock_error(sk);
1977 if (err)
1978 goto out;
1979
1980 if (signal_pending(current)) {
1981 err = sock_intr_errno(timeo);
1982 goto out;
1983 }
1984
1985 /*
1986 * Calculate size that we wish to send.
1987 */
1988 len = size - sent;
1989
1990 if (len > mss)
1991 len = mss;
1992
1993 /*
1994 * Wait for queue size to go down below the window
1995 * size.
1996 */
1997 if (dn_queue_too_long(scp, queue, flags)) {
22196d36
DM		 1998 DEFINE_WAIT(wait);
1999
1da177e4
LT		 2000 if (flags & MSG_DONTWAIT) {
2001 err = -EWOULDBLOCK;
2002 goto out;
2003 }
2004
aa395145 2005 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
22196d36
DM		 2006 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2007 sk_wait_event(sk, &timeo,
2008 !dn_queue_too_long(scp, queue, flags));
2009 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
aa395145 2010 finish_wait(sk_sleep(sk), &wait);
1da177e4
LT		 2011 continue;
2012 }
2013
2014 /*
2015 * Get a suitably sized skb.
12a49ffd
PC		 2016 * 64 is a bit of a hack really, but its larger than any
2017 * link-layer headers and has served us well as a good
2018 * guess as to their real length.
1da177e4 2019 */
12a49ffd
PC		 2020 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2021 flags & MSG_DONTWAIT, &err);
1da177e4
LT		 2022
2023 if (err)
2024 break;
2025
2026 if (!skb)
2027 continue;
2028
2029 cb = DN_SKB_CB(skb);
2030
12a49ffd 2031 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
1da177e4
LT		 2032
2033 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2034 err = -EFAULT;
2035 goto out;
2036 }
2037
2038 if (flags & MSG_OOB) {
2039 cb->nsp_flags = 0x30;
2040 if (fctype != NSP_FC_NONE)
2041 scp->flowrem_oth--;
2042 } else {
2043 cb->nsp_flags = 0x00;
2044 if (scp->seg_total == 0)
2045 cb->nsp_flags |= 0x20;
2046
2047 scp->seg_total += len;
429eb0fa 2048
1da177e4
LT		 2049 if (((sent + len) == size) && (flags & MSG_EOR)) {
2050 cb->nsp_flags |= 0x40;
2051 scp->seg_total = 0;
2052 if (fctype == NSP_FC_SCMC)
2053 scp->flowrem_dat--;
2054 }
2055 if (fctype == NSP_FC_SRC)
2056 scp->flowrem_dat--;
2057 }
2058
2059 sent += len;
2060 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2061 skb = NULL;
2062
2063 scp->persist = dn_nsp_persist(sk);
2064
2065 }
2066out:
2067
db849df6 2068 kfree_skb(skb);
1da177e4
LT		 2069
2070 release_sock(sk);
2071
2072 return sent ? sent : err;
2073
2074out_err:
001ab02a 2075 err = sk_stream_error(sk, flags, err);
1da177e4
LT		 2076 release_sock(sk);
2077 return err;
2078}
2079
2080static int dn_device_event(struct notifier_block *this, unsigned long event,
351638e7 2081 void *ptr)
1da177e4 2082{
351638e7 2083 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1da177e4 2084
721499e8 2085 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 2086 return NOTIFY_DONE;
2087
06f8fe11
JP		 2088 switch (event) {
2089 case NETDEV_UP:
2090 dn_dev_up(dev);
2091 break;
2092 case NETDEV_DOWN:
2093 dn_dev_down(dev);
2094 break;
2095 default:
2096 break;
1da177e4
LT		 2097 }
2098
2099 return NOTIFY_DONE;
2100}
2101
2102static struct notifier_block dn_dev_notifier = {
2103 .notifier_call = dn_device_event,
2104};
2105
f2ccd8fa 2106extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
1da177e4 2107
7546dd97 2108static struct packet_type dn_dix_packet_type __read_mostly = {
09640e63 2109 .type = cpu_to_be16(ETH_P_DNA_RT),
1da177e4
LT		 2110 .func = dn_route_rcv,
2111};
2112
2113#ifdef CONFIG_PROC_FS
2114struct dn_iter_state {
2115 int bucket;
2116};
2117
2118static struct sock *dn_socket_get_first(struct seq_file *seq)
2119{
2120 struct dn_iter_state *state = seq->private;
2121 struct sock *n = NULL;
2122
2123 for(state->bucket = 0;
2124 state->bucket < DN_SK_HASH_SIZE;
2125 ++state->bucket) {
2126 n = sk_head(&dn_sk_hash[state->bucket]);
2127 if (n)
2128 break;
2129 }
2130
2131 return n;
2132}
2133
2134static struct sock *dn_socket_get_next(struct seq_file *seq,
2135 struct sock *n)
2136{
2137 struct dn_iter_state *state = seq->private;
2138
2139 n = sk_next(n);
2140try_again:
2141 if (n)
2142 goto out;
2143 if (++state->bucket >= DN_SK_HASH_SIZE)
2144 goto out;
2145 n = sk_head(&dn_sk_hash[state->bucket]);
2146 goto try_again;
2147out:
2148 return n;
2149}
2150
2151static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2152{
2153 struct sock *sk = dn_socket_get_first(seq);
2154
2155 if (sk) {
2156 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2157 --*pos;
2158 }
2159 return *pos ? NULL : sk;
2160}
2161
2162static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2163{
2164 void *rc;
2165 read_lock_bh(&dn_hash_lock);
2166 rc = socket_get_idx(seq, &pos);
2167 if (!rc) {
2168 read_unlock_bh(&dn_hash_lock);
2169 }
2170 return rc;
2171}
2172
2173static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2174{
2175 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2176}
2177
2178static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2179{
2180 void *rc;
2181
2182 if (v == SEQ_START_TOKEN) {
2183 rc = dn_socket_get_idx(seq, 0);
2184 goto out;
2185 }
2186
2187 rc = dn_socket_get_next(seq, v);
2188 if (rc)
2189 goto out;
2190 read_unlock_bh(&dn_hash_lock);
2191out:
2192 ++*pos;
2193 return rc;
2194}
2195
2196static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2197{
2198 if (v && v != SEQ_START_TOKEN)
2199 read_unlock_bh(&dn_hash_lock);
2200}
2201
2202#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2203
2204static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2205{
2206 int i;
429eb0fa 2207
c4106aa8 2208 switch (le16_to_cpu(dn->sdn_objnamel)) {
06f8fe11
JP		 2209 case 0:
2210 sprintf(buf, "%d", dn->sdn_objnum);
2211 break;
2212 default:
2213 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2214 buf[i] = dn->sdn_objname[i];
2215 if (IS_NOT_PRINTABLE(buf[i]))
2216 buf[i] = '.';
2217 }
2218 buf[i] = 0;
429eb0fa 2219 }
1da177e4
LT		 2220}
2221
2222static char *dn_state2asc(unsigned char state)
2223{
06f8fe11
JP		 2224 switch (state) {
2225 case DN_O:
2226 return "OPEN";
2227 case DN_CR:
2228 return " CR";
2229 case DN_DR:
2230 return " DR";
2231 case DN_DRC:
2232 return " DRC";
2233 case DN_CC:
2234 return " CC";
2235 case DN_CI:
2236 return " CI";
2237 case DN_NR:
2238 return " NR";
2239 case DN_NC:
2240 return " NC";
2241 case DN_CD:
2242 return " CD";
2243 case DN_RJ:
2244 return " RJ";
2245 case DN_RUN:
2246 return " RUN";
2247 case DN_DI:
2248 return " DI";
2249 case DN_DIC:
2250 return " DIC";
2251 case DN_DN:
2252 return " DN";
2253 case DN_CL:
2254 return " CL";
2255 case DN_CN:
2256 return " CN";
1da177e4
LT		 2257 }
2258
2259 return "????";
2260}
2261
2262static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2263{
2264 struct dn_scp *scp = DN_SK(sk);
2265 char buf1[DN_ASCBUF_LEN];
2266 char buf2[DN_ASCBUF_LEN];
2267 char local_object[DN_MAXOBJL+3];
2268 char remote_object[DN_MAXOBJL+3];
2269
2270 dn_printable_object(&scp->addr, local_object);
2271 dn_printable_object(&scp->peer, remote_object);
2272
2273 seq_printf(seq,
2274 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2275 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
c4106aa8 2276 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
1da177e4
LT		 2277 scp->addrloc,
2278 scp->numdat,
2279 scp->numoth,
2280 scp->ackxmt_dat,
2281 scp->ackxmt_oth,
2282 scp->flowloc_sw,
2283 local_object,
c4106aa8 2284 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
1da177e4
LT		 2285 scp->addrrem,
2286 scp->numdat_rcv,
2287 scp->numoth_rcv,
2288 scp->ackrcv_dat,
2289 scp->ackrcv_oth,
2290 scp->flowrem_sw,
2291 remote_object,
2292 dn_state2asc(scp->state),
2293 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2294}
2295
2296static int dn_socket_seq_show(struct seq_file *seq, void *v)
2297{
2298 if (v == SEQ_START_TOKEN) {
2299 seq_puts(seq, "Local Remote\n");
2300 } else {
2301 dn_socket_format_entry(seq, v);
2302 }
2303 return 0;
2304}
2305
56b3d975 2306static const struct seq_operations dn_socket_seq_ops = {
1da177e4
LT		 2307 .start = dn_socket_seq_start,
2308 .next = dn_socket_seq_next,
2309 .stop = dn_socket_seq_stop,
2310 .show = dn_socket_seq_show,
2311};
2312
2313static int dn_socket_seq_open(struct inode *inode, struct file *file)
2314{
c20932d2
PE		 2315 return seq_open_private(file, &dn_socket_seq_ops,
2316 sizeof(struct dn_iter_state));
1da177e4
LT		 2317}
2318
9a32144e 2319static const struct file_operations dn_socket_seq_fops = {
1da177e4
LT		 2320 .owner = THIS_MODULE,
2321 .open = dn_socket_seq_open,
2322 .read = seq_read,
2323 .llseek = seq_lseek,
2324 .release = seq_release_private,
2325};
2326#endif
2327
ec1b4cf7 2328static const struct net_proto_family dn_family_ops = {
1da177e4
LT		 2329 .family = AF_DECnet,
2330 .create = dn_create,
2331 .owner = THIS_MODULE,
2332};
2333
90ddc4f0 2334static const struct proto_ops dn_proto_ops = {
1da177e4
LT		 2335 .family = AF_DECnet,
2336 .owner = THIS_MODULE,
2337 .release = dn_release,
2338 .bind = dn_bind,
2339 .connect = dn_connect,
2340 .socketpair = sock_no_socketpair,
2341 .accept = dn_accept,
2342 .getname = dn_getname,
2343 .poll = dn_poll,
2344 .ioctl = dn_ioctl,
2345 .listen = dn_listen,
2346 .shutdown = dn_shutdown,
2347 .setsockopt = dn_setsockopt,
2348 .getsockopt = dn_getsockopt,
2349 .sendmsg = dn_sendmsg,
2350 .recvmsg = dn_recvmsg,
2351 .mmap = sock_no_mmap,
2352 .sendpage = sock_no_sendpage,
2353};
2354
2355void dn_register_sysctl(void);
2356void dn_unregister_sysctl(void);
2357
2358MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2359MODULE_AUTHOR("Linux DECnet Project Team");
2360MODULE_LICENSE("GPL");
2361MODULE_ALIAS_NETPROTO(PF_DECnet);
2362
2363static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2364
2365static int __init decnet_init(void)
2366{
2367 int rc;
2368
429eb0fa 2369 printk(banner);
1da177e4
LT		 2370
2371 rc = proto_register(&dn_proto, 1);
2372 if (rc != 0)
2373 goto out;
2374
2375 dn_neigh_init();
2376 dn_dev_init();
2377 dn_route_init();
2378 dn_fib_init();
2379
2380 sock_register(&dn_family_ops);
2381 dev_add_pack(&dn_dix_packet_type);
2382 register_netdevice_notifier(&dn_dev_notifier);
2383
d4beaa66 2384 proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
1da177e4
LT		 2385 dn_register_sysctl();
2386out:
2387 return rc;
2388
2389}
2390module_init(decnet_init);
2391
2392/*
2393 * Prevent DECnet module unloading until its fixed properly.
2394 * Requires an audit of the code to check for memory leaks and
2395 * initialisation problems etc.
2396 */
2397#if 0
2398static void __exit decnet_exit(void)
2399{
2400 sock_unregister(AF_DECnet);
fa34ddd7 2401 rtnl_unregister_all(PF_DECnet);
1da177e4
LT		 2402 dev_remove_pack(&dn_dix_packet_type);
2403
2404 dn_unregister_sysctl();
2405
2406 unregister_netdevice_notifier(&dn_dev_notifier);
2407
2408 dn_route_cleanup();
2409 dn_dev_cleanup();
2410 dn_neigh_cleanup();
2411 dn_fib_cleanup();
2412
ece31ffd 2413 remove_proc_entry("decnet", init_net.proc_net);
1da177e4
LT		 2414
2415 proto_unregister(&dn_proto);
10e85448
JDB		 2416
2417 rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
1da177e4
LT		 2418}
2419module_exit(decnet_exit);
2420#endif
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