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net: skb->rtable accessor
[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
LT		 121#include <net/flow.h>
122#include <asm/system.h>
123#include <asm/ioctls.h>
4fc268d2 124#include <linux/capability.h>
1da177e4
LT		 125#include <linux/mm.h>
126#include <linux/interrupt.h>
127#include <linux/proc_fs.h>
128#include <linux/stat.h>
129#include <linux/init.h>
130#include <linux/poll.h>
457c4cbc 131#include <net/net_namespace.h>
1da177e4
LT		 132#include <net/neighbour.h>
133#include <net/dst.h>
a8731cbf 134#include <net/fib_rules.h>
1da177e4
LT		 135#include <net/dn.h>
136#include <net/dn_nsp.h>
137#include <net/dn_dev.h>
138#include <net/dn_route.h>
139#include <net/dn_fib.h>
140#include <net/dn_neigh.h>
141
142struct dn_sock {
143 struct sock sk;
144 struct dn_scp scp;
145};
146
147static void dn_keepalive(struct sock *sk);
148
149#define DN_SK_HASH_SHIFT 8
150#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
151#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
152
153
90ddc4f0 154static const struct proto_ops dn_proto_ops;
1da177e4
LT		 155static DEFINE_RWLOCK(dn_hash_lock);
156static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
157static struct hlist_head dn_wild_sk;
1f12bcc9 158static atomic_t decnet_memory_allocated;
1da177e4
LT		 159
160static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
161static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
162
163static struct hlist_head *dn_find_list(struct sock *sk)
164{
165 struct dn_scp *scp = DN_SK(sk);
166
167 if (scp->addr.sdn_flags & SDF_WILD)
168 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
169
c4106aa8 170 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
1da177e4
LT		 171}
172
429eb0fa 173/*
1da177e4
LT		 174 * Valid ports are those greater than zero and not already in use.
175 */
c4ea94ab 176static int check_port(__le16 port)
1da177e4
LT		 177{
178 struct sock *sk;
179 struct hlist_node *node;
180
181 if (port == 0)
182 return -1;
183
c4106aa8 184 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
1da177e4
LT		 185 struct dn_scp *scp = DN_SK(sk);
186 if (scp->addrloc == port)
187 return -1;
188 }
189 return 0;
190}
191
192static unsigned short port_alloc(struct sock *sk)
193{
194 struct dn_scp *scp = DN_SK(sk);
195static unsigned short port = 0x2000;
196 unsigned short i_port = port;
197
c4106aa8 198 while(check_port(cpu_to_le16(++port)) != 0) {
1da177e4
LT		 199 if (port == i_port)
200 return 0;
201 }
202
c4106aa8 203 scp->addrloc = cpu_to_le16(port);
1da177e4
LT		 204
205 return 1;
206}
207
208/*
209 * Since this is only ever called from user
210 * level, we don't need a write_lock() version
211 * of this.
212 */
213static int dn_hash_sock(struct sock *sk)
214{
215 struct dn_scp *scp = DN_SK(sk);
216 struct hlist_head *list;
217 int rv = -EUSERS;
218
219 BUG_ON(sk_hashed(sk));
220
221 write_lock_bh(&dn_hash_lock);
429eb0fa 222
1da177e4
LT		 223 if (!scp->addrloc && !port_alloc(sk))
224 goto out;
225
226 rv = -EADDRINUSE;
227 if ((list = dn_find_list(sk)) == NULL)
228 goto out;
229
230 sk_add_node(sk, list);
231 rv = 0;
232out:
233 write_unlock_bh(&dn_hash_lock);
234 return rv;
235}
236
237static void dn_unhash_sock(struct sock *sk)
238{
239 write_lock(&dn_hash_lock);
240 sk_del_node_init(sk);
241 write_unlock(&dn_hash_lock);
242}
243
244static void dn_unhash_sock_bh(struct sock *sk)
245{
246 write_lock_bh(&dn_hash_lock);
247 sk_del_node_init(sk);
248 write_unlock_bh(&dn_hash_lock);
249}
250
251static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
252{
253 int i;
254 unsigned hash = addr->sdn_objnum;
255
256 if (hash == 0) {
257 hash = addr->sdn_objnamel;
c4106aa8 258 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
1da177e4
LT		 259 hash ^= addr->sdn_objname[i];
260 hash ^= (hash << 3);
261 }
262 }
263
264 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
265}
266
267/*
268 * Called to transform a socket from bound (i.e. with a local address)
269 * into a listening socket (doesn't need a local port number) and rehashes
270 * based upon the object name/number.
271 */
272static void dn_rehash_sock(struct sock *sk)
273{
274 struct hlist_head *list;
275 struct dn_scp *scp = DN_SK(sk);
276
277 if (scp->addr.sdn_flags & SDF_WILD)
278 return;
279
280 write_lock_bh(&dn_hash_lock);
281 sk_del_node_init(sk);
282 DN_SK(sk)->addrloc = 0;
283 list = listen_hash(&DN_SK(sk)->addr);
284 sk_add_node(sk, list);
285 write_unlock_bh(&dn_hash_lock);
286}
287
288int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
289{
290 int len = 2;
291
292 *buf++ = type;
293
294 switch(type) {
295 case 0:
296 *buf++ = sdn->sdn_objnum;
297 break;
298 case 1:
299 *buf++ = 0;
c4106aa8
HH		 300 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
301 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
302 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
1da177e4
LT		 303 break;
304 case 2:
305 memset(buf, 0, 5);
306 buf += 5;
c4106aa8
HH		 307 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
308 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
309 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
1da177e4
LT		 310 break;
311 }
312
313 return len;
314}
315
316/*
317 * On reception of usernames, we handle types 1 and 0 for destination
318 * addresses only. Types 2 and 4 are used for source addresses, but the
319 * UIC, GIC are ignored and they are both treated the same way. Type 3
320 * is never used as I've no idea what its purpose might be or what its
321 * format is.
322 */
323int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
324{
325 unsigned char type;
326 int size = len;
327 int namel = 12;
328
329 sdn->sdn_objnum = 0;
c4106aa8 330 sdn->sdn_objnamel = cpu_to_le16(0);
1da177e4
LT		 331 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
332
333 if (len < 2)
334 return -1;
335
336 len -= 2;
337 *fmt = *data++;
338 type = *data++;
339
340 switch(*fmt) {
341 case 0:
342 sdn->sdn_objnum = type;
343 return 2;
344 case 1:
345 namel = 16;
346 break;
347 case 2:
348 len -= 4;
349 data += 4;
350 break;
351 case 4:
352 len -= 8;
353 data += 8;
354 break;
355 default:
356 return -1;
357 }
358
359 len -= 1;
360
361 if (len < 0)
362 return -1;
363
c4106aa8
HH		 364 sdn->sdn_objnamel = cpu_to_le16(*data++);
365 len -= le16_to_cpu(sdn->sdn_objnamel);
1da177e4 366
c4106aa8 367 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
1da177e4
LT		 368 return -1;
369
c4106aa8 370 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
1da177e4
LT		 371
372 return size - len;
373}
374
375struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
376{
377 struct hlist_head *list = listen_hash(addr);
378 struct hlist_node *node;
379 struct sock *sk;
380
381 read_lock(&dn_hash_lock);
382 sk_for_each(sk, node, list) {
383 struct dn_scp *scp = DN_SK(sk);
384 if (sk->sk_state != TCP_LISTEN)
385 continue;
386 if (scp->addr.sdn_objnum) {
387 if (scp->addr.sdn_objnum != addr->sdn_objnum)
388 continue;
389 } else {
390 if (addr->sdn_objnum)
391 continue;
392 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
393 continue;
c4106aa8 394 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
1da177e4
LT		 395 continue;
396 }
397 sock_hold(sk);
398 read_unlock(&dn_hash_lock);
399 return sk;
400 }
401
402 sk = sk_head(&dn_wild_sk);
403 if (sk) {
429eb0fa 404 if (sk->sk_state == TCP_LISTEN)
1da177e4
LT		 405 sock_hold(sk);
406 else
407 sk = NULL;
408 }
409
410 read_unlock(&dn_hash_lock);
411 return sk;
412}
413
414struct sock *dn_find_by_skb(struct sk_buff *skb)
415{
416 struct dn_skb_cb *cb = DN_SKB_CB(skb);
417 struct sock *sk;
418 struct hlist_node *node;
419 struct dn_scp *scp;
420
421 read_lock(&dn_hash_lock);
c4106aa8 422 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
1da177e4
LT		 423 scp = DN_SK(sk);
424 if (cb->src != dn_saddr2dn(&scp->peer))
425 continue;
426 if (cb->dst_port != scp->addrloc)
427 continue;
428 if (scp->addrrem && (cb->src_port != scp->addrrem))
429 continue;
430 sock_hold(sk);
431 goto found;
432 }
433 sk = NULL;
434found:
435 read_unlock(&dn_hash_lock);
436 return sk;
437}
438
439
440
441static void dn_destruct(struct sock *sk)
442{
443 struct dn_scp *scp = DN_SK(sk);
444
445 skb_queue_purge(&scp->data_xmit_queue);
446 skb_queue_purge(&scp->other_xmit_queue);
447 skb_queue_purge(&scp->other_receive_queue);
448
449 dst_release(xchg(&sk->sk_dst_cache, NULL));
450}
451
1f12bcc9
SW		 452static int dn_memory_pressure;
453
5c52ba17 454static void dn_enter_memory_pressure(struct sock *sk)
1f12bcc9
SW		 455{
456 if (!dn_memory_pressure) {
457 dn_memory_pressure = 1;
458 }
459}
460
1da177e4 461static struct proto dn_proto = {
1f12bcc9
SW		 462 .name = "NSP",
463 .owner = THIS_MODULE,
464 .enter_memory_pressure = dn_enter_memory_pressure,
465 .memory_pressure = &dn_memory_pressure,
466 .memory_allocated = &decnet_memory_allocated,
467 .sysctl_mem = sysctl_decnet_mem,
468 .sysctl_wmem = sysctl_decnet_wmem,
469 .sysctl_rmem = sysctl_decnet_rmem,
470 .max_header = DN_MAX_NSP_DATA_HEADER + 64,
471 .obj_size = sizeof(struct dn_sock),
1da177e4
LT		 472};
473
1b8d7ae4 474static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
1da177e4
LT		 475{
476 struct dn_scp *scp;
6257ff21 477 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
1da177e4
LT		 478
479 if (!sk)
480 goto out;
481
482 if (sock)
483 sock->ops = &dn_proto_ops;
484 sock_init_data(sock, sk);
485
486 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
487 sk->sk_destruct = dn_destruct;
488 sk->sk_no_check = 1;
489 sk->sk_family = PF_DECnet;
490 sk->sk_protocol = 0;
491 sk->sk_allocation = gfp;
1f12bcc9
SW		 492 sk->sk_sndbuf = sysctl_decnet_wmem[1];
493 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
1da177e4
LT		 494
495 /* Initialization of DECnet Session Control Port */
496 scp = DN_SK(sk);
497 scp->state = DN_O; /* Open */
498 scp->numdat = 1; /* Next data seg to tx */
499 scp->numoth = 1; /* Next oth data to tx */
500 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
501 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
502 scp->ackrcv_dat = 0; /* Highest data ack recv*/
503 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
429eb0fa 504 scp->flowrem_sw = DN_SEND;
1da177e4
LT		 505 scp->flowloc_sw = DN_SEND;
506 scp->flowrem_dat = 0;
507 scp->flowrem_oth = 1;
508 scp->flowloc_dat = 0;
509 scp->flowloc_oth = 1;
510 scp->services_rem = 0;
511 scp->services_loc = 1 | NSP_FC_NONE;
512 scp->info_rem = 0;
513 scp->info_loc = 0x03; /* NSP version 4.1 */
514 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
515 scp->nonagle = 0;
516 scp->multi_ireq = 1;
517 scp->accept_mode = ACC_IMMED;
518 scp->addr.sdn_family = AF_DECnet;
519 scp->peer.sdn_family = AF_DECnet;
520 scp->accessdata.acc_accl = 5;
521 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
522
523 scp->max_window = NSP_MAX_WINDOW;
524 scp->snd_window = NSP_MIN_WINDOW;
525 scp->nsp_srtt = NSP_INITIAL_SRTT;
526 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
527 scp->nsp_rxtshift = 0;
528
529 skb_queue_head_init(&scp->data_xmit_queue);
530 skb_queue_head_init(&scp->other_xmit_queue);
531 skb_queue_head_init(&scp->other_receive_queue);
532
533 scp->persist = 0;
534 scp->persist_fxn = NULL;
535 scp->keepalive = 10 * HZ;
536 scp->keepalive_fxn = dn_keepalive;
537
538 init_timer(&scp->delack_timer);
539 scp->delack_pending = 0;
540 scp->delack_fxn = dn_nsp_delayed_ack;
541
542 dn_start_slow_timer(sk);
543out:
544 return sk;
545}
546
547/*
548 * Keepalive timer.
549 * FIXME: Should respond to SO_KEEPALIVE etc.
550 */
551static void dn_keepalive(struct sock *sk)
552{
553 struct dn_scp *scp = DN_SK(sk);
554
555 /*
556 * By checking the other_data transmit queue is empty
557 * we are double checking that we are not sending too
558 * many of these keepalive frames.
559 */
b03efcfb 560 if (skb_queue_empty(&scp->other_xmit_queue))
1da177e4
LT		 561 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
562}
563
564
565/*
566 * Timer for shutdown/destroyed sockets.
567 * When socket is dead & no packets have been sent for a
568 * certain amount of time, they are removed by this
569 * routine. Also takes care of sending out DI & DC
570 * frames at correct times.
571 */
572int dn_destroy_timer(struct sock *sk)
573{
574 struct dn_scp *scp = DN_SK(sk);
575
576 scp->persist = dn_nsp_persist(sk);
577
578 switch(scp->state) {
579 case DN_DI:
580 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
581 if (scp->nsp_rxtshift >= decnet_di_count)
582 scp->state = DN_CN;
583 return 0;
584
585 case DN_DR:
586 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
587 if (scp->nsp_rxtshift >= decnet_dr_count)
588 scp->state = DN_DRC;
589 return 0;
590
591 case DN_DN:
592 if (scp->nsp_rxtshift < decnet_dn_count) {
593 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
594 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
595 return 0;
596 }
597 }
598
599 scp->persist = (HZ * decnet_time_wait);
600
601 if (sk->sk_socket)
602 return 0;
603
604 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
605 dn_unhash_sock(sk);
606 sock_put(sk);
607 return 1;
608 }
609
610 return 0;
611}
612
613static void dn_destroy_sock(struct sock *sk)
614{
615 struct dn_scp *scp = DN_SK(sk);
616
617 scp->nsp_rxtshift = 0; /* reset back off */
618
619 if (sk->sk_socket) {
620 if (sk->sk_socket->state != SS_UNCONNECTED)
621 sk->sk_socket->state = SS_DISCONNECTING;
622 }
623
624 sk->sk_state = TCP_CLOSE;
625
626 switch(scp->state) {
627 case DN_DN:
628 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
629 sk->sk_allocation);
630 scp->persist_fxn = dn_destroy_timer;
631 scp->persist = dn_nsp_persist(sk);
632 break;
633 case DN_CR:
634 scp->state = DN_DR;
635 goto disc_reject;
636 case DN_RUN:
637 scp->state = DN_DI;
638 case DN_DI:
639 case DN_DR:
640disc_reject:
641 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
642 case DN_NC:
643 case DN_NR:
644 case DN_RJ:
645 case DN_DIC:
646 case DN_CN:
647 case DN_DRC:
648 case DN_CI:
649 case DN_CD:
650 scp->persist_fxn = dn_destroy_timer;
651 scp->persist = dn_nsp_persist(sk);
652 break;
653 default:
654 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
655 case DN_O:
656 dn_stop_slow_timer(sk);
657
658 dn_unhash_sock_bh(sk);
659 sock_put(sk);
660
661 break;
662 }
663}
664
c4ea94ab 665char *dn_addr2asc(__u16 addr, char *buf)
1da177e4
LT		 666{
667 unsigned short node, area;
668
669 node = addr & 0x03ff;
670 area = addr >> 10;
671 sprintf(buf, "%hd.%hd", area, node);
672
673 return buf;
674}
675
676
677
1b8d7ae4 678static int dn_create(struct net *net, struct socket *sock, int protocol)
1da177e4
LT		 679{
680 struct sock *sk;
681
1b8d7ae4
EB		 682 if (net != &init_net)
683 return -EAFNOSUPPORT;
684
1da177e4
LT		 685 switch(sock->type) {
686 case SOCK_SEQPACKET:
687 if (protocol != DNPROTO_NSP)
688 return -EPROTONOSUPPORT;
689 break;
690 case SOCK_STREAM:
691 break;
692 default:
693 return -ESOCKTNOSUPPORT;
694 }
695
696
1b8d7ae4 697 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
1da177e4
LT		 698 return -ENOBUFS;
699
700 sk->sk_protocol = protocol;
701
702 return 0;
703}
704
705
706static int
707dn_release(struct socket *sock)
708{
709 struct sock *sk = sock->sk;
710
711 if (sk) {
712 sock_orphan(sk);
713 sock_hold(sk);
714 lock_sock(sk);
715 dn_destroy_sock(sk);
716 release_sock(sk);
717 sock_put(sk);
718 }
719
429eb0fa 720 return 0;
1da177e4
LT		 721}
722
723static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
724{
725 struct sock *sk = sock->sk;
726 struct dn_scp *scp = DN_SK(sk);
727 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
7562f876 728 struct net_device *dev, *ldev;
1da177e4
LT		 729 int rv;
730
731 if (addr_len != sizeof(struct sockaddr_dn))
732 return -EINVAL;
733
734 if (saddr->sdn_family != AF_DECnet)
735 return -EINVAL;
736
c4106aa8 737 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
1da177e4
LT		 738 return -EINVAL;
739
c4106aa8 740 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
1da177e4
LT		 741 return -EINVAL;
742
743 if (saddr->sdn_flags & ~SDF_WILD)
744 return -EINVAL;
745
1da177e4
LT		 746 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
747 (saddr->sdn_flags & SDF_WILD)))
748 return -EACCES;
1da177e4
LT		 749
750 if (!(saddr->sdn_flags & SDF_WILD)) {
c4106aa8 751 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
1da177e4 752 read_lock(&dev_base_lock);
7562f876 753 ldev = NULL;
881d966b 754 for_each_netdev(&init_net, dev) {
1da177e4
LT		 755 if (!dev->dn_ptr)
756 continue;
7562f876
PE		 757 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
758 ldev = dev;
1da177e4 759 break;
7562f876 760 }
1da177e4
LT		 761 }
762 read_unlock(&dev_base_lock);
7562f876 763 if (ldev == NULL)
1da177e4
LT		 764 return -EADDRNOTAVAIL;
765 }
766 }
767
768 rv = -EINVAL;
769 lock_sock(sk);
770 if (sock_flag(sk, SOCK_ZAPPED)) {
771 memcpy(&scp->addr, saddr, addr_len);
772 sock_reset_flag(sk, SOCK_ZAPPED);
773
774 rv = dn_hash_sock(sk);
775 if (rv)
776 sock_set_flag(sk, SOCK_ZAPPED);
777 }
778 release_sock(sk);
779
429eb0fa 780 return rv;
1da177e4
LT		 781}
782
783
784static int dn_auto_bind(struct socket *sock)
785{
786 struct sock *sk = sock->sk;
787 struct dn_scp *scp = DN_SK(sk);
788 int rv;
789
790 sock_reset_flag(sk, SOCK_ZAPPED);
791
792 scp->addr.sdn_flags = 0;
793 scp->addr.sdn_objnum = 0;
794
795 /*
796 * This stuff is to keep compatibility with Eduardo's
797 * patch. I hope I can dispense with it shortly...
798 */
799 if ((scp->accessdata.acc_accl != 0) &&
800 (scp->accessdata.acc_accl <= 12)) {
429eb0fa 801
c4106aa8
HH		 802 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
803 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
1da177e4
LT		 804
805 scp->accessdata.acc_accl = 0;
806 memset(scp->accessdata.acc_acc, 0, 40);
807 }
808 /* End of compatibility stuff */
809
c4106aa8 810 scp->addr.sdn_add.a_len = cpu_to_le16(2);
c4ea94ab 811 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
1da177e4
LT		 812 if (rv == 0) {
813 rv = dn_hash_sock(sk);
814 if (rv)
815 sock_set_flag(sk, SOCK_ZAPPED);
816 }
817
818 return rv;
819}
820
dd0fc66f 821static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
1da177e4
LT		 822{
823 struct dn_scp *scp = DN_SK(sk);
824 DEFINE_WAIT(wait);
825 int err;
826
827 if (scp->state != DN_CR)
828 return -EINVAL;
829
830 scp->state = DN_CC;
831 scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
832 dn_send_conn_conf(sk, allocation);
833
834 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
835 for(;;) {
836 release_sock(sk);
837 if (scp->state == DN_CC)
838 *timeo = schedule_timeout(*timeo);
839 lock_sock(sk);
840 err = 0;
841 if (scp->state == DN_RUN)
842 break;
843 err = sock_error(sk);
844 if (err)
845 break;
846 err = sock_intr_errno(*timeo);
847 if (signal_pending(current))
848 break;
849 err = -EAGAIN;
850 if (!*timeo)
851 break;
852 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
853 }
854 finish_wait(sk->sk_sleep, &wait);
855 if (err == 0) {
856 sk->sk_socket->state = SS_CONNECTED;
857 } else if (scp->state != DN_CC) {
858 sk->sk_socket->state = SS_UNCONNECTED;
859 }
860 return err;
861}
862
863static int dn_wait_run(struct sock *sk, long *timeo)
864{
865 struct dn_scp *scp = DN_SK(sk);
866 DEFINE_WAIT(wait);
867 int err = 0;
868
869 if (scp->state == DN_RUN)
870 goto out;
871
872 if (!*timeo)
873 return -EALREADY;
874
875 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
876 for(;;) {
877 release_sock(sk);
878 if (scp->state == DN_CI || scp->state == DN_CC)
879 *timeo = schedule_timeout(*timeo);
880 lock_sock(sk);
881 err = 0;
882 if (scp->state == DN_RUN)
883 break;
884 err = sock_error(sk);
885 if (err)
886 break;
887 err = sock_intr_errno(*timeo);
888 if (signal_pending(current))
889 break;
890 err = -ETIMEDOUT;
891 if (!*timeo)
892 break;
893 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
894 }
895 finish_wait(sk->sk_sleep, &wait);
896out:
897 if (err == 0) {
898 sk->sk_socket->state = SS_CONNECTED;
899 } else if (scp->state != DN_CI && scp->state != DN_CC) {
900 sk->sk_socket->state = SS_UNCONNECTED;
901 }
902 return err;
903}
904
905static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
906{
907 struct socket *sock = sk->sk_socket;
908 struct dn_scp *scp = DN_SK(sk);
909 int err = -EISCONN;
910 struct flowi fl;
911
912 if (sock->state == SS_CONNECTED)
913 goto out;
914
915 if (sock->state == SS_CONNECTING) {
916 err = 0;
917 if (scp->state == DN_RUN) {
918 sock->state = SS_CONNECTED;
919 goto out;
920 }
921 err = -ECONNREFUSED;
922 if (scp->state != DN_CI && scp->state != DN_CC) {
923 sock->state = SS_UNCONNECTED;
924 goto out;
925 }
926 return dn_wait_run(sk, timeo);
927 }
928
929 err = -EINVAL;
930 if (scp->state != DN_O)
931 goto out;
932
933 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
934 goto out;
935 if (addr->sdn_family != AF_DECnet)
936 goto out;
937 if (addr->sdn_flags & SDF_WILD)
938 goto out;
939
940 if (sock_flag(sk, SOCK_ZAPPED)) {
941 err = dn_auto_bind(sk->sk_socket);
942 if (err)
943 goto out;
944 }
945
946 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
947
948 err = -EHOSTUNREACH;
949 memset(&fl, 0, sizeof(fl));
950 fl.oif = sk->sk_bound_dev_if;
951 fl.fld_dst = dn_saddr2dn(&scp->peer);
952 fl.fld_src = dn_saddr2dn(&scp->addr);
953 dn_sk_ports_copy(&fl, scp);
954 fl.proto = DNPROTO_NSP;
955 if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
956 goto out;
957 sk->sk_route_caps = sk->sk_dst_cache->dev->features;
958 sock->state = SS_CONNECTING;
959 scp->state = DN_CI;
960 scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
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
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);
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
1042 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
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;
1062 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1063 }
1064 finish_wait(sk->sk_sleep, &wait);
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);
1078
1079 lock_sock(sk);
1080
429eb0fa 1081 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1da177e4
LT		 1082 release_sock(sk);
1083 return -EINVAL;
1084 }
1085
1086 skb = skb_dequeue(&sk->sk_receive_queue);
1087 if (skb == NULL) {
1088 skb = dn_wait_for_connect(sk, &timeo);
1089 if (IS_ERR(skb)) {
1090 release_sock(sk);
1091 return PTR_ERR(skb);
1092 }
1093 }
1094
1095 cb = DN_SKB_CB(skb);
1096 sk->sk_ack_backlog--;
3b1e0a65 1097 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1da177e4
LT		 1098 if (newsk == NULL) {
1099 release_sock(sk);
1100 kfree_skb(skb);
1101 return -ENOBUFS;
1102 }
1103 release_sock(sk);
1104
1105 dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1106 skb->dst = NULL;
1107
429eb0fa 1108 DN_SK(newsk)->state = DN_CR;
1da177e4
LT		 1109 DN_SK(newsk)->addrrem = cb->src_port;
1110 DN_SK(newsk)->services_rem = cb->services;
1111 DN_SK(newsk)->info_rem = cb->info;
1112 DN_SK(newsk)->segsize_rem = cb->segsize;
1113 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
429eb0fa 1114
1da177e4
LT		 1115 if (DN_SK(newsk)->segsize_rem < 230)
1116 DN_SK(newsk)->segsize_rem = 230;
1117
1118 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1119 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1120
1121 newsk->sk_state = TCP_LISTEN;
1122 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1123
1124 /*
1125 * If we are listening on a wild socket, we don't want
1126 * the newly created socket on the wrong hash queue.
1127 */
1128 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1129
1130 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1131 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
c4ea94ab
SW		 1132 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1133 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1da177e4
LT		 1134
1135 menuver = *skb->data;
1136 skb_pull(skb, 1);
1137
1138 if (menuver & DN_MENUVER_ACC)
1139 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1140
1141 if (menuver & DN_MENUVER_USR)
1142 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1143
1144 if (menuver & DN_MENUVER_PRX)
1145 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1146
1147 if (menuver & DN_MENUVER_UIC)
1148 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1149
1150 kfree_skb(skb);
1151
1152 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1153 sizeof(struct optdata_dn));
1154 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1155 sizeof(struct optdata_dn));
1156
1157 lock_sock(newsk);
1158 err = dn_hash_sock(newsk);
1159 if (err == 0) {
1160 sock_reset_flag(newsk, SOCK_ZAPPED);
1161 dn_send_conn_ack(newsk);
1162
1163 /*
429eb0fa
YH		 1164 * Here we use sk->sk_allocation since although the conn conf is
1165 * for the newsk, the context is the old socket.
1166 */
1da177e4
LT		 1167 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1168 err = dn_confirm_accept(newsk, &timeo,
1169 sk->sk_allocation);
1170 }
1171 release_sock(newsk);
429eb0fa 1172 return err;
1da177e4
LT		 1173}
1174
1175
1176static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1177{
1178 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1179 struct sock *sk = sock->sk;
1180 struct dn_scp *scp = DN_SK(sk);
1181
1182 *uaddr_len = sizeof(struct sockaddr_dn);
1183
1184 lock_sock(sk);
1185
1186 if (peer) {
429eb0fa
YH		 1187 if ((sock->state != SS_CONNECTED &&
1188 sock->state != SS_CONNECTING) &&
52c41a32 1189 scp->accept_mode == ACC_IMMED) {
429eb0fa 1190 release_sock(sk);
1da177e4 1191 return -ENOTCONN;
52c41a32 1192 }
1da177e4
LT		 1193
1194 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1195 } else {
1196 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1197 }
1198
1199 release_sock(sk);
1200
429eb0fa 1201 return 0;
1da177e4
LT		 1202}
1203
1204
1205static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1206{
1207 struct sock *sk = sock->sk;
1208 struct dn_scp *scp = DN_SK(sk);
1209 int mask = datagram_poll(file, sock, wait);
1210
b03efcfb 1211 if (!skb_queue_empty(&scp->other_receive_queue))
1da177e4
LT		 1212 mask |= POLLRDBAND;
1213
1214 return mask;
1215}
1216
1217static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1218{
1219 struct sock *sk = sock->sk;
1220 struct dn_scp *scp = DN_SK(sk);
1221 int err = -EOPNOTSUPP;
1222 long amount = 0;
1223 struct sk_buff *skb;
1224 int val;
1225
1226 switch(cmd)
1227 {
1228 case SIOCGIFADDR:
1229 case SIOCSIFADDR:
1230 return dn_dev_ioctl(cmd, (void __user *)arg);
1231
1232 case SIOCATMARK:
1233 lock_sock(sk);
b03efcfb 1234 val = !skb_queue_empty(&scp->other_receive_queue);
1da177e4
LT		 1235 if (scp->state != DN_RUN)
1236 val = -ENOTCONN;
1237 release_sock(sk);
1238 return val;
1239
1240 case TIOCOUTQ:
1241 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1242 if (amount < 0)
1243 amount = 0;
1244 err = put_user(amount, (int __user *)arg);
1245 break;
1246
1247 case TIOCINQ:
1248 lock_sock(sk);
e57c624b
HE		 1249 skb = skb_peek(&scp->other_receive_queue);
1250 if (skb) {
1da177e4
LT		 1251 amount = skb->len;
1252 } else {
bec571ec 1253 skb_queue_walk(&sk->sk_receive_queue, skb)
1da177e4 1254 amount += skb->len;
1da177e4
LT		 1255 }
1256 release_sock(sk);
1257 err = put_user(amount, (int __user *)arg);
1258 break;
1259
1260 default:
b5e5fa5e 1261 err = -ENOIOCTLCMD;
1da177e4
LT		 1262 break;
1263 }
1264
1265 return err;
1266}
1267
1268static int dn_listen(struct socket *sock, int backlog)
1269{
1270 struct sock *sk = sock->sk;
1271 int err = -EINVAL;
1272
1273 lock_sock(sk);
1274
1275 if (sock_flag(sk, SOCK_ZAPPED))
1276 goto out;
1277
1278 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1279 goto out;
1280
1281 sk->sk_max_ack_backlog = backlog;
1282 sk->sk_ack_backlog = 0;
1283 sk->sk_state = TCP_LISTEN;
1284 err = 0;
1285 dn_rehash_sock(sk);
1286
1287out:
1288 release_sock(sk);
1289
429eb0fa 1290 return err;
1da177e4
LT		 1291}
1292
1293
1294static int dn_shutdown(struct socket *sock, int how)
1295{
1296 struct sock *sk = sock->sk;
1297 struct dn_scp *scp = DN_SK(sk);
1298 int err = -ENOTCONN;
1299
1300 lock_sock(sk);
1301
1302 if (sock->state == SS_UNCONNECTED)
1303 goto out;
1304
1305 err = 0;
1306 if (sock->state == SS_DISCONNECTING)
1307 goto out;
1308
1309 err = -EINVAL;
1310 if (scp->state == DN_O)
1311 goto out;
1312
1313 if (how != SHUTDOWN_MASK)
1314 goto out;
1315
1316 sk->sk_shutdown = how;
1317 dn_destroy_sock(sk);
1318 err = 0;
1319
1320out:
1321 release_sock(sk);
1322
1323 return err;
1324}
1325
1326static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1327{
1328 struct sock *sk = sock->sk;
1329 int err;
1330
1331 lock_sock(sk);
1332 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1333 release_sock(sk);
1334
1335 return err;
1336}
1337
429eb0fa 1338static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1da177e4
LT		 1339{
1340 struct sock *sk = sock->sk;
1341 struct dn_scp *scp = DN_SK(sk);
1342 long timeo;
1343 union {
1344 struct optdata_dn opt;
1345 struct accessdata_dn acc;
1346 int mode;
1347 unsigned long win;
1348 int val;
1349 unsigned char services;
1350 unsigned char info;
1351 } u;
1352 int err;
1353
1354 if (optlen && !optval)
1355 return -EINVAL;
1356
1357 if (optlen > sizeof(u))
1358 return -EINVAL;
1359
1360 if (copy_from_user(&u, optval, optlen))
1361 return -EFAULT;
1362
1363 switch(optname) {
1364 case DSO_CONDATA:
429eb0fa 1365 if (sock->state == SS_CONNECTED)
1da177e4
LT		 1366 return -EISCONN;
1367 if ((scp->state != DN_O) && (scp->state != DN_CR))
1368 return -EINVAL;
1369
1370 if (optlen != sizeof(struct optdata_dn))
1371 return -EINVAL;
1372
c4106aa8 1373 if (le16_to_cpu(u.opt.opt_optl) > 16)
1da177e4
LT		 1374 return -EINVAL;
1375
1376 memcpy(&scp->conndata_out, &u.opt, optlen);
1377 break;
1378
1379 case DSO_DISDATA:
429eb0fa 1380 if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1da177e4
LT		 1381 return -ENOTCONN;
1382
1383 if (optlen != sizeof(struct optdata_dn))
1384 return -EINVAL;
1385
c4106aa8 1386 if (le16_to_cpu(u.opt.opt_optl) > 16)
1da177e4
LT		 1387 return -EINVAL;
1388
1389 memcpy(&scp->discdata_out, &u.opt, optlen);
1390 break;
1391
1392 case DSO_CONACCESS:
429eb0fa 1393 if (sock->state == SS_CONNECTED)
1da177e4
LT		 1394 return -EISCONN;
1395 if (scp->state != DN_O)
1396 return -EINVAL;
1397
1398 if (optlen != sizeof(struct accessdata_dn))
1399 return -EINVAL;
1400
1401 if ((u.acc.acc_accl > DN_MAXACCL) ||
1402 (u.acc.acc_passl > DN_MAXACCL) ||
1403 (u.acc.acc_userl > DN_MAXACCL))
1404 return -EINVAL;
1405
1406 memcpy(&scp->accessdata, &u.acc, optlen);
1407 break;
1408
1409 case DSO_ACCEPTMODE:
1410 if (sock->state == SS_CONNECTED)
1411 return -EISCONN;
1412 if (scp->state != DN_O)
1413 return -EINVAL;
1414
1415 if (optlen != sizeof(int))
1416 return -EINVAL;
1417
1418 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1419 return -EINVAL;
1420
1421 scp->accept_mode = (unsigned char)u.mode;
1422 break;
1423
1424 case DSO_CONACCEPT:
1425
1426 if (scp->state != DN_CR)
1427 return -EINVAL;
1428 timeo = sock_rcvtimeo(sk, 0);
1429 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1430 return err;
1431
1432 case DSO_CONREJECT:
1433
1434 if (scp->state != DN_CR)
1435 return -EINVAL;
1436
1437 scp->state = DN_DR;
1438 sk->sk_shutdown = SHUTDOWN_MASK;
1439 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1440 break;
1441
1442 default:
1443#ifdef CONFIG_NETFILTER
1444 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1445#endif
1446 case DSO_LINKINFO:
1447 case DSO_STREAM:
1448 case DSO_SEQPACKET:
1449 return -ENOPROTOOPT;
1450
1451 case DSO_MAXWINDOW:
1452 if (optlen != sizeof(unsigned long))
1453 return -EINVAL;
1454 if (u.win > NSP_MAX_WINDOW)
1455 u.win = NSP_MAX_WINDOW;
1456 if (u.win == 0)
1457 return -EINVAL;
1458 scp->max_window = u.win;
1459 if (scp->snd_window > u.win)
1460 scp->snd_window = u.win;
1461 break;
1462
1463 case DSO_NODELAY:
1464 if (optlen != sizeof(int))
1465 return -EINVAL;
1466 if (scp->nonagle == 2)
1467 return -EINVAL;
1468 scp->nonagle = (u.val == 0) ? 0 : 1;
1469 /* if (scp->nonagle == 1) { Push pending frames } */
1470 break;
1471
1472 case DSO_CORK:
1473 if (optlen != sizeof(int))
1474 return -EINVAL;
1475 if (scp->nonagle == 1)
1476 return -EINVAL;
1477 scp->nonagle = (u.val == 0) ? 0 : 2;
1478 /* if (scp->nonagle == 0) { Push pending frames } */
1479 break;
1480
1481 case DSO_SERVICES:
1482 if (optlen != sizeof(unsigned char))
1483 return -EINVAL;
1484 if ((u.services & ~NSP_FC_MASK) != 0x01)
1485 return -EINVAL;
1486 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1487 return -EINVAL;
1488 scp->services_loc = u.services;
1489 break;
1490
1491 case DSO_INFO:
1492 if (optlen != sizeof(unsigned char))
1493 return -EINVAL;
1494 if (u.info & 0xfc)
1495 return -EINVAL;
1496 scp->info_loc = u.info;
1497 break;
1498 }
1499
1500 return 0;
1501}
1502
1503static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1504{
1505 struct sock *sk = sock->sk;
1506 int err;
1507
1508 lock_sock(sk);
1509 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1510 release_sock(sk);
1511
1512 return err;
1513}
1514
1515static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1516{
1517 struct sock *sk = sock->sk;
1518 struct dn_scp *scp = DN_SK(sk);
1519 struct linkinfo_dn link;
1520 unsigned int r_len;
1521 void *r_data = NULL;
1522 unsigned int val;
1523
1524 if(get_user(r_len , optlen))
1525 return -EFAULT;
429eb0fa 1526
1da177e4
LT		 1527 switch(optname) {
1528 case DSO_CONDATA:
1529 if (r_len > sizeof(struct optdata_dn))
1530 r_len = sizeof(struct optdata_dn);
1531 r_data = &scp->conndata_in;
1532 break;
1533
1534 case DSO_DISDATA:
1535 if (r_len > sizeof(struct optdata_dn))
1536 r_len = sizeof(struct optdata_dn);
1537 r_data = &scp->discdata_in;
1538 break;
1539
1540 case DSO_CONACCESS:
1541 if (r_len > sizeof(struct accessdata_dn))
1542 r_len = sizeof(struct accessdata_dn);
1543 r_data = &scp->accessdata;
1544 break;
1545
1546 case DSO_ACCEPTMODE:
1547 if (r_len > sizeof(unsigned char))
1548 r_len = sizeof(unsigned char);
1549 r_data = &scp->accept_mode;
1550 break;
1551
1552 case DSO_LINKINFO:
1553 if (r_len > sizeof(struct linkinfo_dn))
1554 r_len = sizeof(struct linkinfo_dn);
1555
1556 switch(sock->state) {
1557 case SS_CONNECTING:
1558 link.idn_linkstate = LL_CONNECTING;
1559 break;
1560 case SS_DISCONNECTING:
1561 link.idn_linkstate = LL_DISCONNECTING;
1562 break;
1563 case SS_CONNECTED:
1564 link.idn_linkstate = LL_RUNNING;
1565 break;
1566 default:
1567 link.idn_linkstate = LL_INACTIVE;
1568 }
1569
1570 link.idn_segsize = scp->segsize_rem;
1571 r_data = &link;
1572 break;
1573
1574 default:
1575#ifdef CONFIG_NETFILTER
1576 {
e57c624b 1577 int ret, len;
429eb0fa 1578
1da177e4
LT		 1579 if(get_user(len, optlen))
1580 return -EFAULT;
429eb0fa 1581
e57c624b 1582 ret = nf_getsockopt(sk, PF_DECnet, optname,
1da177e4 1583 optval, &len);
e57c624b
HE		 1584 if (ret >= 0)
1585 ret = put_user(len, optlen);
1586 return ret;
1da177e4
LT		 1587 }
1588#endif
1589 case DSO_STREAM:
1590 case DSO_SEQPACKET:
1591 case DSO_CONACCEPT:
1592 case DSO_CONREJECT:
429eb0fa 1593 return -ENOPROTOOPT;
1da177e4
LT		 1594
1595 case DSO_MAXWINDOW:
1596 if (r_len > sizeof(unsigned long))
1597 r_len = sizeof(unsigned long);
1598 r_data = &scp->max_window;
1599 break;
1600
1601 case DSO_NODELAY:
1602 if (r_len > sizeof(int))
1603 r_len = sizeof(int);
1604 val = (scp->nonagle == 1);
1605 r_data = &val;
1606 break;
1607
1608 case DSO_CORK:
1609 if (r_len > sizeof(int))
1610 r_len = sizeof(int);
1611 val = (scp->nonagle == 2);
1612 r_data = &val;
1613 break;
1614
1615 case DSO_SERVICES:
1616 if (r_len > sizeof(unsigned char))
1617 r_len = sizeof(unsigned char);
1618 r_data = &scp->services_rem;
1619 break;
1620
1621 case DSO_INFO:
1622 if (r_len > sizeof(unsigned char))
1623 r_len = sizeof(unsigned char);
1624 r_data = &scp->info_rem;
1625 break;
1626 }
1627
1628 if (r_data) {
1629 if (copy_to_user(optval, r_data, r_len))
1630 return -EFAULT;
1631 if (put_user(r_len, optlen))
1632 return -EFAULT;
1633 }
1634
1635 return 0;
1636}
1637
1638
1639static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1640{
bec571ec 1641 struct sk_buff *skb;
1da177e4
LT		 1642 int len = 0;
1643
1644 if (flags & MSG_OOB)
b03efcfb 1645 return !skb_queue_empty(q) ? 1 : 0;
1da177e4 1646
bec571ec 1647 skb_queue_walk(q, skb) {
1da177e4
LT		 1648 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1649 len += skb->len;
1650
1651 if (cb->nsp_flags & 0x40) {
1652 /* SOCK_SEQPACKET reads to EOM */
1653 if (sk->sk_type == SOCK_SEQPACKET)
1654 return 1;
1655 /* so does SOCK_STREAM unless WAITALL is specified */
1656 if (!(flags & MSG_WAITALL))
1657 return 1;
1658 }
1659
1660 /* minimum data length for read exceeded */
1661 if (len >= target)
1662 return 1;
1da177e4
LT		 1663 }
1664
1665 return 0;
1666}
1667
1668
1669static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1670 struct msghdr *msg, size_t size, int flags)
1671{
1672 struct sock *sk = sock->sk;
1673 struct dn_scp *scp = DN_SK(sk);
1674 struct sk_buff_head *queue = &sk->sk_receive_queue;
1675 size_t target = size > 1 ? 1 : 0;
1676 size_t copied = 0;
1677 int rv = 0;
bec571ec 1678 struct sk_buff *skb, *n;
1da177e4
LT		 1679 struct dn_skb_cb *cb = NULL;
1680 unsigned char eor = 0;
1681 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1682
1683 lock_sock(sk);
1684
1685 if (sock_flag(sk, SOCK_ZAPPED)) {
1686 rv = -EADDRNOTAVAIL;
1687 goto out;
1688 }
1689
1da177e4 1690 if (sk->sk_shutdown & RCV_SHUTDOWN) {
9eb5c94e 1691 rv = 0;
1da177e4
LT		 1692 goto out;
1693 }
1694
9eb5c94e
PC		 1695 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1696 if (rv)
1697 goto out;
1698
c60992db 1699 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1da177e4
LT		 1700 rv = -EOPNOTSUPP;
1701 goto out;
1702 }
1703
1704 if (flags & MSG_OOB)
1705 queue = &scp->other_receive_queue;
1706
1707 if (flags & MSG_WAITALL)
1708 target = size;
1709
1710
1711 /*
1712 * See if there is data ready to read, sleep if there isn't
1713 */
1714 for(;;) {
22196d36
DM		 1715 DEFINE_WAIT(wait);
1716
1da177e4
LT		 1717 if (sk->sk_err)
1718 goto out;
1719
b03efcfb 1720 if (!skb_queue_empty(&scp->other_receive_queue)) {
1da177e4
LT		 1721 if (!(flags & MSG_OOB)) {
1722 msg->msg_flags |= MSG_OOB;
1723 if (!scp->other_report) {
1724 scp->other_report = 1;
1725 goto out;
1726 }
1727 }
1728 }
429eb0fa 1729
1da177e4
LT		 1730 if (scp->state != DN_RUN)
1731 goto out;
1732
1733 if (signal_pending(current)) {
1734 rv = sock_intr_errno(timeo);
1735 goto out;
1736 }
1737
1738 if (dn_data_ready(sk, queue, flags, target))
1739 break;
1740
1741 if (flags & MSG_DONTWAIT) {
1742 rv = -EWOULDBLOCK;
1743 goto out;
1744 }
1745
22196d36
DM		 1746 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1747 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1748 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1749 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1750 finish_wait(sk->sk_sleep, &wait);
1da177e4
LT		 1751 }
1752
bec571ec 1753 skb_queue_walk_safe(queue, skb, n) {
1da177e4
LT		 1754 unsigned int chunk = skb->len;
1755 cb = DN_SKB_CB(skb);
1756
1757 if ((chunk + copied) > size)
1758 chunk = size - copied;
1759
1760 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1761 rv = -EFAULT;
1762 break;
1763 }
1764 copied += chunk;
1765
1766 if (!(flags & MSG_PEEK))
1767 skb_pull(skb, chunk);
1768
1769 eor = cb->nsp_flags & 0x40;
1da177e4
LT		 1770
1771 if (skb->len == 0) {
8728b834 1772 skb_unlink(skb, queue);
1da177e4 1773 kfree_skb(skb);
429eb0fa 1774 /*
1da177e4
LT		 1775 * N.B. Don't refer to skb or cb after this point
1776 * in loop.
1777 */
1778 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1779 scp->flowloc_sw = DN_SEND;
1780 dn_nsp_send_link(sk, DN_SEND, 0);
1781 }
1782 }
1783
429eb0fa 1784 if (eor) {
1da177e4
LT		 1785 if (sk->sk_type == SOCK_SEQPACKET)
1786 break;
1787 if (!(flags & MSG_WAITALL))
1788 break;
1789 }
1790
1791 if (flags & MSG_OOB)
1792 break;
1793
1794 if (copied >= target)
1795 break;
1796 }
1797
1798 rv = copied;
1799
1800
1801 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1802 msg->msg_flags |= MSG_EOR;
1803
1804out:
1805 if (rv == 0)
1806 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1807
1808 if ((rv >= 0) && msg->msg_name) {
1809 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1810 msg->msg_namelen = sizeof(struct sockaddr_dn);
1811 }
1812
1813 release_sock(sk);
1814
1815 return rv;
1816}
1817
1818
1819static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1820{
1821 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1822 if (skb_queue_len(queue) >= scp->snd_window)
1823 return 1;
1824 if (fctype != NSP_FC_NONE) {
1825 if (flags & MSG_OOB) {
1826 if (scp->flowrem_oth == 0)
1827 return 1;
1828 } else {
1829 if (scp->flowrem_dat == 0)
1830 return 1;
1831 }
1832 }
1833 return 0;
1834}
1835
1836/*
59c51591 1837 * The DECnet spec requires that the "routing layer" accepts packets which
1da177e4
LT		 1838 * are at least 230 bytes in size. This excludes any headers which the NSP
1839 * layer might add, so we always assume that we'll be using the maximal
1840 * length header on data packets. The variation in length is due to the
1841 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1842 * make much practical difference.
1843 */
1844unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1845{
1846 unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1847 if (dev) {
1848 struct dn_dev *dn_db = dev->dn_ptr;
1849 mtu -= LL_RESERVED_SPACE(dev);
1850 if (dn_db->use_long)
1851 mtu -= 21;
1852 else
1853 mtu -= 6;
1854 mtu -= DN_MAX_NSP_DATA_HEADER;
1855 } else {
1856 /*
1857 * 21 = long header, 16 = guess at MAC header length
1858 */
1859 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1860 }
1861 if (mtu > mss)
1862 mss = mtu;
1863 return mss;
1864}
1865
1866static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1867{
1868 struct dst_entry *dst = __sk_dst_get(sk);
1869 struct dn_scp *scp = DN_SK(sk);
1870 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1871
1872 /* Other data messages are limited to 16 bytes per packet */
1873 if (flags & MSG_OOB)
1874 return 16;
1875
1876 /* This works out the maximum size of segment we can send out */
1877 if (dst) {
1878 u32 mtu = dst_mtu(dst);
1879 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1880 }
1881
1882 return mss_now;
1883}
1884
429eb0fa 1885/*
12a49ffd
PC		 1886 * N.B. We get the timeout wrong here, but then we always did get it
1887 * wrong before and this is another step along the road to correcting
1888 * it. It ought to get updated each time we pass through the routine,
1889 * but in practise it probably doesn't matter too much for now.
1890 */
1891static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1892 unsigned long datalen, int noblock,
1893 int *errcode)
1894{
1895 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1896 noblock, errcode);
1897 if (skb) {
b98999dc 1898 skb->protocol = htons(ETH_P_DNA_RT);
12a49ffd
PC		 1899 skb->pkt_type = PACKET_OUTGOING;
1900 }
1901 return skb;
1902}
1903
1da177e4 1904static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
12a49ffd 1905 struct msghdr *msg, size_t size)
1da177e4
LT		 1906{
1907 struct sock *sk = sock->sk;
1908 struct dn_scp *scp = DN_SK(sk);
1909 size_t mss;
1910 struct sk_buff_head *queue = &scp->data_xmit_queue;
1911 int flags = msg->msg_flags;
1912 int err = 0;
1913 size_t sent = 0;
1914 int addr_len = msg->msg_namelen;
1915 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1916 struct sk_buff *skb = NULL;
1917 struct dn_skb_cb *cb;
1918 size_t len;
1919 unsigned char fctype;
12a49ffd 1920 long timeo;
1da177e4
LT		 1921
1922 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1923 return -EOPNOTSUPP;
1924
1925 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1926 return -EINVAL;
1927
12a49ffd
PC		 1928 lock_sock(sk);
1929 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1da177e4
LT		 1930 /*
1931 * The only difference between stream sockets and sequenced packet
1932 * sockets is that the stream sockets always behave as if MSG_EOR
1933 * has been set.
1934 */
1935 if (sock->type == SOCK_STREAM) {
12a49ffd
PC		 1936 if (flags & MSG_EOR) {
1937 err = -EINVAL;
1938 goto out;
1939 }
1da177e4
LT		 1940 flags |= MSG_EOR;
1941 }
1942
1da177e4
LT		 1943
1944 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1945 if (err)
1946 goto out_err;
1947
1948 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1949 err = -EPIPE;
9eb5c94e
PC		 1950 if (!(flags & MSG_NOSIGNAL))
1951 send_sig(SIGPIPE, current, 0);
1da177e4
LT		 1952 goto out_err;
1953 }
1954
1955 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1956 dst_negative_advice(&sk->sk_dst_cache);
1957
1958 mss = scp->segsize_rem;
1959 fctype = scp->services_rem & NSP_FC_MASK;
1960
1961 mss = dn_current_mss(sk, flags);
1962
1963 if (flags & MSG_OOB) {
1964 queue = &scp->other_xmit_queue;
1965 if (size > mss) {
1966 err = -EMSGSIZE;
1967 goto out;
1968 }
1969 }
1970
1971 scp->persist_fxn = dn_nsp_xmit_timeout;
1972
1973 while(sent < size) {
1974 err = sock_error(sk);
1975 if (err)
1976 goto out;
1977
1978 if (signal_pending(current)) {
1979 err = sock_intr_errno(timeo);
1980 goto out;
1981 }
1982
1983 /*
1984 * Calculate size that we wish to send.
1985 */
1986 len = size - sent;
1987
1988 if (len > mss)
1989 len = mss;
1990
1991 /*
1992 * Wait for queue size to go down below the window
1993 * size.
1994 */
1995 if (dn_queue_too_long(scp, queue, flags)) {
22196d36
DM		 1996 DEFINE_WAIT(wait);
1997
1da177e4
LT		 1998 if (flags & MSG_DONTWAIT) {
1999 err = -EWOULDBLOCK;
2000 goto out;
2001 }
2002
22196d36
DM		 2003 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
2004 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2005 sk_wait_event(sk, &timeo,
2006 !dn_queue_too_long(scp, queue, flags));
2007 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2008 finish_wait(sk->sk_sleep, &wait);
1da177e4
LT		 2009 continue;
2010 }
2011
2012 /*
2013 * Get a suitably sized skb.
12a49ffd
PC		 2014 * 64 is a bit of a hack really, but its larger than any
2015 * link-layer headers and has served us well as a good
2016 * guess as to their real length.
1da177e4 2017 */
12a49ffd
PC		 2018 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2019 flags & MSG_DONTWAIT, &err);
1da177e4
LT		 2020
2021 if (err)
2022 break;
2023
2024 if (!skb)
2025 continue;
2026
2027 cb = DN_SKB_CB(skb);
2028
12a49ffd 2029 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
1da177e4
LT		 2030
2031 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2032 err = -EFAULT;
2033 goto out;
2034 }
2035
2036 if (flags & MSG_OOB) {
2037 cb->nsp_flags = 0x30;
2038 if (fctype != NSP_FC_NONE)
2039 scp->flowrem_oth--;
2040 } else {
2041 cb->nsp_flags = 0x00;
2042 if (scp->seg_total == 0)
2043 cb->nsp_flags |= 0x20;
2044
2045 scp->seg_total += len;
429eb0fa 2046
1da177e4
LT		 2047 if (((sent + len) == size) && (flags & MSG_EOR)) {
2048 cb->nsp_flags |= 0x40;
2049 scp->seg_total = 0;
2050 if (fctype == NSP_FC_SCMC)
2051 scp->flowrem_dat--;
2052 }
2053 if (fctype == NSP_FC_SRC)
2054 scp->flowrem_dat--;
2055 }
2056
2057 sent += len;
2058 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2059 skb = NULL;
2060
2061 scp->persist = dn_nsp_persist(sk);
2062
2063 }
2064out:
2065
db849df6 2066 kfree_skb(skb);
1da177e4
LT		 2067
2068 release_sock(sk);
2069
2070 return sent ? sent : err;
2071
2072out_err:
001ab02a 2073 err = sk_stream_error(sk, flags, err);
1da177e4
LT		 2074 release_sock(sk);
2075 return err;
2076}
2077
2078static int dn_device_event(struct notifier_block *this, unsigned long event,
2079 void *ptr)
2080{
2081 struct net_device *dev = (struct net_device *)ptr;
2082
721499e8 2083 if (!net_eq(dev_net(dev), &init_net))
e9dc8653
EB		 2084 return NOTIFY_DONE;
2085
1da177e4
LT		 2086 switch(event) {
2087 case NETDEV_UP:
2088 dn_dev_up(dev);
2089 break;
2090 case NETDEV_DOWN:
2091 dn_dev_down(dev);
2092 break;
2093 default:
2094 break;
2095 }
2096
2097 return NOTIFY_DONE;
2098}
2099
2100static struct notifier_block dn_dev_notifier = {
2101 .notifier_call = dn_device_event,
2102};
2103
f2ccd8fa 2104extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
1da177e4 2105
7546dd97 2106static struct packet_type dn_dix_packet_type __read_mostly = {
09640e63 2107 .type = cpu_to_be16(ETH_P_DNA_RT),
1da177e4
LT		 2108 .func = dn_route_rcv,
2109};
2110
2111#ifdef CONFIG_PROC_FS
2112struct dn_iter_state {
2113 int bucket;
2114};
2115
2116static struct sock *dn_socket_get_first(struct seq_file *seq)
2117{
2118 struct dn_iter_state *state = seq->private;
2119 struct sock *n = NULL;
2120
2121 for(state->bucket = 0;
2122 state->bucket < DN_SK_HASH_SIZE;
2123 ++state->bucket) {
2124 n = sk_head(&dn_sk_hash[state->bucket]);
2125 if (n)
2126 break;
2127 }
2128
2129 return n;
2130}
2131
2132static struct sock *dn_socket_get_next(struct seq_file *seq,
2133 struct sock *n)
2134{
2135 struct dn_iter_state *state = seq->private;
2136
2137 n = sk_next(n);
2138try_again:
2139 if (n)
2140 goto out;
2141 if (++state->bucket >= DN_SK_HASH_SIZE)
2142 goto out;
2143 n = sk_head(&dn_sk_hash[state->bucket]);
2144 goto try_again;
2145out:
2146 return n;
2147}
2148
2149static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2150{
2151 struct sock *sk = dn_socket_get_first(seq);
2152
2153 if (sk) {
2154 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2155 --*pos;
2156 }
2157 return *pos ? NULL : sk;
2158}
2159
2160static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2161{
2162 void *rc;
2163 read_lock_bh(&dn_hash_lock);
2164 rc = socket_get_idx(seq, &pos);
2165 if (!rc) {
2166 read_unlock_bh(&dn_hash_lock);
2167 }
2168 return rc;
2169}
2170
2171static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2172{
2173 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2174}
2175
2176static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2177{
2178 void *rc;
2179
2180 if (v == SEQ_START_TOKEN) {
2181 rc = dn_socket_get_idx(seq, 0);
2182 goto out;
2183 }
2184
2185 rc = dn_socket_get_next(seq, v);
2186 if (rc)
2187 goto out;
2188 read_unlock_bh(&dn_hash_lock);
2189out:
2190 ++*pos;
2191 return rc;
2192}
2193
2194static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2195{
2196 if (v && v != SEQ_START_TOKEN)
2197 read_unlock_bh(&dn_hash_lock);
2198}
2199
2200#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2201
2202static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2203{
2204 int i;
429eb0fa 2205
c4106aa8 2206 switch (le16_to_cpu(dn->sdn_objnamel)) {
1da177e4
LT		 2207 case 0:
2208 sprintf(buf, "%d", dn->sdn_objnum);
2209 break;
2210 default:
c4106aa8 2211 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
1da177e4
LT		 2212 buf[i] = dn->sdn_objname[i];
2213 if (IS_NOT_PRINTABLE(buf[i]))
2214 buf[i] = '.';
2215 }
2216 buf[i] = 0;
429eb0fa 2217 }
1da177e4
LT		 2218}
2219
2220static char *dn_state2asc(unsigned char state)
2221{
2222 switch(state) {
2223 case DN_O:
2224 return "OPEN";
2225 case DN_CR:
2226 return " CR";
2227 case DN_DR:
2228 return " DR";
2229 case DN_DRC:
2230 return " DRC";
2231 case DN_CC:
2232 return " CC";
2233 case DN_CI:
2234 return " CI";
2235 case DN_NR:
2236 return " NR";
2237 case DN_NC:
2238 return " NC";
2239 case DN_CD:
2240 return " CD";
2241 case DN_RJ:
2242 return " RJ";
2243 case DN_RUN:
2244 return " RUN";
2245 case DN_DI:
2246 return " DI";
2247 case DN_DIC:
2248 return " DIC";
2249 case DN_DN:
2250 return " DN";
2251 case DN_CL:
2252 return " CL";
2253 case DN_CN:
2254 return " CN";
2255 }
2256
2257 return "????";
2258}
2259
2260static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2261{
2262 struct dn_scp *scp = DN_SK(sk);
2263 char buf1[DN_ASCBUF_LEN];
2264 char buf2[DN_ASCBUF_LEN];
2265 char local_object[DN_MAXOBJL+3];
2266 char remote_object[DN_MAXOBJL+3];
2267
2268 dn_printable_object(&scp->addr, local_object);
2269 dn_printable_object(&scp->peer, remote_object);
2270
2271 seq_printf(seq,
2272 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2273 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
c4106aa8 2274 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
1da177e4
LT		 2275 scp->addrloc,
2276 scp->numdat,
2277 scp->numoth,
2278 scp->ackxmt_dat,
2279 scp->ackxmt_oth,
2280 scp->flowloc_sw,
2281 local_object,
c4106aa8 2282 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
1da177e4
LT		 2283 scp->addrrem,
2284 scp->numdat_rcv,
2285 scp->numoth_rcv,
2286 scp->ackrcv_dat,
2287 scp->ackrcv_oth,
2288 scp->flowrem_sw,
2289 remote_object,
2290 dn_state2asc(scp->state),
2291 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2292}
2293
2294static int dn_socket_seq_show(struct seq_file *seq, void *v)
2295{
2296 if (v == SEQ_START_TOKEN) {
2297 seq_puts(seq, "Local Remote\n");
2298 } else {
2299 dn_socket_format_entry(seq, v);
2300 }
2301 return 0;
2302}
2303
56b3d975 2304static const struct seq_operations dn_socket_seq_ops = {
1da177e4
LT		 2305 .start = dn_socket_seq_start,
2306 .next = dn_socket_seq_next,
2307 .stop = dn_socket_seq_stop,
2308 .show = dn_socket_seq_show,
2309};
2310
2311static int dn_socket_seq_open(struct inode *inode, struct file *file)
2312{
c20932d2
PE		 2313 return seq_open_private(file, &dn_socket_seq_ops,
2314 sizeof(struct dn_iter_state));
1da177e4
LT		 2315}
2316
9a32144e 2317static const struct file_operations dn_socket_seq_fops = {
1da177e4
LT		 2318 .owner = THIS_MODULE,
2319 .open = dn_socket_seq_open,
2320 .read = seq_read,
2321 .llseek = seq_lseek,
2322 .release = seq_release_private,
2323};
2324#endif
2325
2326static struct net_proto_family dn_family_ops = {
2327 .family = AF_DECnet,
2328 .create = dn_create,
2329 .owner = THIS_MODULE,
2330};
2331
90ddc4f0 2332static const struct proto_ops dn_proto_ops = {
1da177e4
LT		 2333 .family = AF_DECnet,
2334 .owner = THIS_MODULE,
2335 .release = dn_release,
2336 .bind = dn_bind,
2337 .connect = dn_connect,
2338 .socketpair = sock_no_socketpair,
2339 .accept = dn_accept,
2340 .getname = dn_getname,
2341 .poll = dn_poll,
2342 .ioctl = dn_ioctl,
2343 .listen = dn_listen,
2344 .shutdown = dn_shutdown,
2345 .setsockopt = dn_setsockopt,
2346 .getsockopt = dn_getsockopt,
2347 .sendmsg = dn_sendmsg,
2348 .recvmsg = dn_recvmsg,
2349 .mmap = sock_no_mmap,
2350 .sendpage = sock_no_sendpage,
2351};
2352
2353void dn_register_sysctl(void);
2354void dn_unregister_sysctl(void);
2355
2356MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2357MODULE_AUTHOR("Linux DECnet Project Team");
2358MODULE_LICENSE("GPL");
2359MODULE_ALIAS_NETPROTO(PF_DECnet);
2360
2361static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2362
2363static int __init decnet_init(void)
2364{
2365 int rc;
2366
429eb0fa 2367 printk(banner);
1da177e4
LT		 2368
2369 rc = proto_register(&dn_proto, 1);
2370 if (rc != 0)
2371 goto out;
2372
2373 dn_neigh_init();
2374 dn_dev_init();
2375 dn_route_init();
2376 dn_fib_init();
2377
2378 sock_register(&dn_family_ops);
2379 dev_add_pack(&dn_dix_packet_type);
2380 register_netdevice_notifier(&dn_dev_notifier);
2381
457c4cbc 2382 proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
1da177e4
LT		 2383 dn_register_sysctl();
2384out:
2385 return rc;
2386
2387}
2388module_init(decnet_init);
2389
2390/*
2391 * Prevent DECnet module unloading until its fixed properly.
2392 * Requires an audit of the code to check for memory leaks and
2393 * initialisation problems etc.
2394 */
2395#if 0
2396static void __exit decnet_exit(void)
2397{
2398 sock_unregister(AF_DECnet);
fa34ddd7 2399 rtnl_unregister_all(PF_DECnet);
1da177e4
LT		 2400 dev_remove_pack(&dn_dix_packet_type);
2401
2402 dn_unregister_sysctl();
2403
2404 unregister_netdevice_notifier(&dn_dev_notifier);
2405
2406 dn_route_cleanup();
2407 dn_dev_cleanup();
2408 dn_neigh_cleanup();
2409 dn_fib_cleanup();
2410
457c4cbc 2411 proc_net_remove(&init_net, "decnet");
1da177e4
LT		 2412
2413 proto_unregister(&dn_proto);
2414}
2415module_exit(decnet_exit);
2416#endif
kernel source for telekom puls (alcatel/mediatek)