1
2 /*
3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * DECnet Socket Layer Interface
8 *
9 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
10 * Patrick Caulfield <patrick@pandh.demon.co.uk>
11 *
12 * Changes:
13 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
14 * version of the code. Original copyright preserved
15 * below.
16 * Steve Whitehouse: Some bug fixes, cleaning up some code to make it
17 * compatible with my routing layer.
18 * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
19 * Caulfield.
20 * Steve Whitehouse: Further bug fixes, checking module code still works
21 * with new routing layer.
22 * Steve Whitehouse: Additional set/get_sockopt() calls.
23 * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
24 * code.
25 * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
26 * way. Didn't manage it entirely, but its better.
27 * Steve Whitehouse: ditto for sendmsg().
28 * Steve Whitehouse: A selection of bug fixes to various things.
29 * Steve Whitehouse: Added TIOCOUTQ ioctl.
30 * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
31 * Steve Whitehouse: Fixes to connect() error returns.
32 * Patrick Caulfield: Fixes to delayed acceptance logic.
33 * David S. Miller: New socket locking
34 * Steve Whitehouse: Socket list hashing/locking
35 * Arnaldo C. Melo: use capable, not suser
36 * Steve Whitehouse: Removed unused code. Fix to use sk->allocation
37 * when required.
38 * Patrick Caulfield: /proc/net/decnet now has object name/number
39 * Steve Whitehouse: Fixed local port allocation, hashed sk list
40 * Matthew Wilcox: Fixes for dn_ioctl()
41 * Steve Whitehouse: New connect/accept logic to allow timeouts and
42 * prepare for sendpage etc.
43 */
44
45
46 /******************************************************************************
47 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
48
49 This program is free software; you can redistribute it and/or modify
50 it under the terms of the GNU General Public License as published by
51 the Free Software Foundation; either version 2 of the License, or
52 any later version.
53
54 This program is distributed in the hope that it will be useful,
55 but WITHOUT ANY WARRANTY; without even the implied warranty of
56 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
57 GNU General Public License for more details.
58
59 HISTORY:
60
61 Version Kernel Date Author/Comments
62 ------- ------ ---- ---------------
63 Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
64 (emserrat@geocities.com)
65
66 First Development of DECnet Socket La-
67 yer for Linux. Only supports outgoing
68 connections.
69
70 Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
71 (patrick@pandh.demon.co.uk)
72
73 Port to new kernel development version.
74
75 Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
76 (emserrat@geocities.com)
77 _
78 Added support for incoming connections
79 so we can start developing server apps
80 on Linux.
81 -
82 Module Support
83 Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
84 (emserrat@geocities.com)
85 _
86 Added support for X11R6.4. Now we can
87 use DECnet transport for X on Linux!!!
88 -
89 Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
90 (emserrat@geocities.com)
91 Removed bugs on flow control
92 Removed bugs on incoming accessdata
93 order
94 -
95 Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
96 dn_recvmsg fixes
97
98 Patrick J. Caulfield
99 dn_bind fixes
100 *******************************************************************************/
101
102 #include <linux/module.h>
103 #include <linux/errno.h>
104 #include <linux/types.h>
105 #include <linux/slab.h>
106 #include <linux/socket.h>
107 #include <linux/in.h>
108 #include <linux/kernel.h>
109 #include <linux/sched.h>
110 #include <linux/timer.h>
111 #include <linux/string.h>
112 #include <linux/sockios.h>
113 #include <linux/net.h>
114 #include <linux/netdevice.h>
115 #include <linux/inet.h>
116 #include <linux/route.h>
117 #include <linux/netfilter.h>
118 #include <linux/seq_file.h>
119 #include <net/sock.h>
120 #include <net/tcp_states.h>
121 #include <net/flow.h>
122 #include <asm/system.h>
123 #include <asm/ioctls.h>
124 #include <linux/capability.h>
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>
131 #include <net/net_namespace.h>
132 #include <net/neighbour.h>
133 #include <net/dst.h>
134 #include <net/fib_rules.h>
135 #include <net/dn.h>
136 #include <net/dn_nsp.h>
137 #include <net/dn_dev.h>
138 #include <net/dn_route.h>
139 #include <net/dn_fib.h>
140 #include <net/dn_neigh.h>
141
142 struct dn_sock {
143 struct sock sk;
144 struct dn_scp scp;
145 };
146
147 static void dn_keepalive(struct sock *sk);
148
149 #define DN_SK_HASH_SHIFT 8
150 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
151 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
152
153
154 static const struct proto_ops dn_proto_ops;
155 static DEFINE_RWLOCK(dn_hash_lock);
156 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
157 static struct hlist_head dn_wild_sk;
158 static atomic_long_t decnet_memory_allocated;
159
160 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
161 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
162
dn_find_list(struct sock * sk)163 static struct hlist_head *dn_find_list(struct sock *sk)
164 {
165 struct dn_scp *scp = DN_SK(sk);
166
167 if (scp->addr.sdn_flags & SDF_WILD)
168 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
169
170 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
171 }
172
173 /*
174 * Valid ports are those greater than zero and not already in use.
175 */
check_port(__le16 port)176 static int check_port(__le16 port)
177 {
178 struct sock *sk;
179 struct hlist_node *node;
180
181 if (port == 0)
182 return -1;
183
184 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
185 struct dn_scp *scp = DN_SK(sk);
186 if (scp->addrloc == port)
187 return -1;
188 }
189 return 0;
190 }
191
port_alloc(struct sock * sk)192 static unsigned short port_alloc(struct sock *sk)
193 {
194 struct dn_scp *scp = DN_SK(sk);
195 static unsigned short port = 0x2000;
196 unsigned short i_port = port;
197
198 while(check_port(cpu_to_le16(++port)) != 0) {
199 if (port == i_port)
200 return 0;
201 }
202
203 scp->addrloc = cpu_to_le16(port);
204
205 return 1;
206 }
207
208 /*
209 * Since this is only ever called from user
210 * level, we don't need a write_lock() version
211 * of this.
212 */
dn_hash_sock(struct sock * sk)213 static int dn_hash_sock(struct sock *sk)
214 {
215 struct dn_scp *scp = DN_SK(sk);
216 struct hlist_head *list;
217 int rv = -EUSERS;
218
219 BUG_ON(sk_hashed(sk));
220
221 write_lock_bh(&dn_hash_lock);
222
223 if (!scp->addrloc && !port_alloc(sk))
224 goto out;
225
226 rv = -EADDRINUSE;
227 if ((list = dn_find_list(sk)) == NULL)
228 goto out;
229
230 sk_add_node(sk, list);
231 rv = 0;
232 out:
233 write_unlock_bh(&dn_hash_lock);
234 return rv;
235 }
236
dn_unhash_sock(struct sock * sk)237 static void dn_unhash_sock(struct sock *sk)
238 {
239 write_lock(&dn_hash_lock);
240 sk_del_node_init(sk);
241 write_unlock(&dn_hash_lock);
242 }
243
dn_unhash_sock_bh(struct sock * sk)244 static void dn_unhash_sock_bh(struct sock *sk)
245 {
246 write_lock_bh(&dn_hash_lock);
247 sk_del_node_init(sk);
248 write_unlock_bh(&dn_hash_lock);
249 }
250
listen_hash(struct sockaddr_dn * addr)251 static 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;
258 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
259 hash ^= addr->sdn_objname[i];
260 hash ^= (hash << 3);
261 }
262 }
263
264 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
265 }
266
267 /*
268 * Called to transform a socket from bound (i.e. with a local address)
269 * into a listening socket (doesn't need a local port number) and rehashes
270 * based upon the object name/number.
271 */
dn_rehash_sock(struct sock * sk)272 static void dn_rehash_sock(struct sock *sk)
273 {
274 struct hlist_head *list;
275 struct dn_scp *scp = DN_SK(sk);
276
277 if (scp->addr.sdn_flags & SDF_WILD)
278 return;
279
280 write_lock_bh(&dn_hash_lock);
281 sk_del_node_init(sk);
282 DN_SK(sk)->addrloc = 0;
283 list = listen_hash(&DN_SK(sk)->addr);
284 sk_add_node(sk, list);
285 write_unlock_bh(&dn_hash_lock);
286 }
287
dn_sockaddr2username(struct sockaddr_dn * sdn,unsigned char * buf,unsigned char type)288 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
289 {
290 int len = 2;
291
292 *buf++ = type;
293
294 switch (type) {
295 case 0:
296 *buf++ = sdn->sdn_objnum;
297 break;
298 case 1:
299 *buf++ = 0;
300 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
301 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
302 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
303 break;
304 case 2:
305 memset(buf, 0, 5);
306 buf += 5;
307 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
308 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
309 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
310 break;
311 }
312
313 return len;
314 }
315
316 /*
317 * On reception of usernames, we handle types 1 and 0 for destination
318 * addresses only. Types 2 and 4 are used for source addresses, but the
319 * UIC, GIC are ignored and they are both treated the same way. Type 3
320 * is never used as I've no idea what its purpose might be or what its
321 * format is.
322 */
dn_username2sockaddr(unsigned char * data,int len,struct sockaddr_dn * sdn,unsigned char * fmt)323 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
324 {
325 unsigned char type;
326 int size = len;
327 int namel = 12;
328
329 sdn->sdn_objnum = 0;
330 sdn->sdn_objnamel = cpu_to_le16(0);
331 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
332
333 if (len < 2)
334 return -1;
335
336 len -= 2;
337 *fmt = *data++;
338 type = *data++;
339
340 switch (*fmt) {
341 case 0:
342 sdn->sdn_objnum = type;
343 return 2;
344 case 1:
345 namel = 16;
346 break;
347 case 2:
348 len -= 4;
349 data += 4;
350 break;
351 case 4:
352 len -= 8;
353 data += 8;
354 break;
355 default:
356 return -1;
357 }
358
359 len -= 1;
360
361 if (len < 0)
362 return -1;
363
364 sdn->sdn_objnamel = cpu_to_le16(*data++);
365 len -= le16_to_cpu(sdn->sdn_objnamel);
366
367 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
368 return -1;
369
370 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
371
372 return size - len;
373 }
374
dn_sklist_find_listener(struct sockaddr_dn * addr)375 struct 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;
394 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
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) {
404 if (sk->sk_state == TCP_LISTEN)
405 sock_hold(sk);
406 else
407 sk = NULL;
408 }
409
410 read_unlock(&dn_hash_lock);
411 return sk;
412 }
413
dn_find_by_skb(struct sk_buff * skb)414 struct 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);
422 sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
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;
434 found:
435 read_unlock(&dn_hash_lock);
436 return sk;
437 }
438
439
440
dn_destruct(struct sock * sk)441 static 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(rcu_dereference_check(sk->sk_dst_cache, 1));
450 }
451
452 static int dn_memory_pressure;
453
dn_enter_memory_pressure(struct sock * sk)454 static void dn_enter_memory_pressure(struct sock *sk)
455 {
456 if (!dn_memory_pressure) {
457 dn_memory_pressure = 1;
458 }
459 }
460
461 static struct proto dn_proto = {
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),
472 };
473
dn_alloc_sock(struct net * net,struct socket * sock,gfp_t gfp)474 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
475 {
476 struct dn_scp *scp;
477 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
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;
492 sk->sk_sndbuf = sysctl_decnet_wmem[1];
493 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
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*/
504 scp->flowrem_sw = DN_SEND;
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);
543 out:
544 return sk;
545 }
546
547 /*
548 * Keepalive timer.
549 * FIXME: Should respond to SO_KEEPALIVE etc.
550 */
dn_keepalive(struct sock * sk)551 static 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 */
560 if (skb_queue_empty(&scp->other_xmit_queue))
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 */
dn_destroy_timer(struct sock * sk)572 int 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,
595 GFP_ATOMIC);
596 return 0;
597 }
598 }
599
600 scp->persist = (HZ * decnet_time_wait);
601
602 if (sk->sk_socket)
603 return 0;
604
605 if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
606 dn_unhash_sock(sk);
607 sock_put(sk);
608 return 1;
609 }
610
611 return 0;
612 }
613
dn_destroy_sock(struct sock * sk)614 static void dn_destroy_sock(struct sock *sk)
615 {
616 struct dn_scp *scp = DN_SK(sk);
617
618 scp->nsp_rxtshift = 0; /* reset back off */
619
620 if (sk->sk_socket) {
621 if (sk->sk_socket->state != SS_UNCONNECTED)
622 sk->sk_socket->state = SS_DISCONNECTING;
623 }
624
625 sk->sk_state = TCP_CLOSE;
626
627 switch (scp->state) {
628 case DN_DN:
629 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
630 sk->sk_allocation);
631 scp->persist_fxn = dn_destroy_timer;
632 scp->persist = dn_nsp_persist(sk);
633 break;
634 case DN_CR:
635 scp->state = DN_DR;
636 goto disc_reject;
637 case DN_RUN:
638 scp->state = DN_DI;
639 case DN_DI:
640 case DN_DR:
641 disc_reject:
642 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
643 case DN_NC:
644 case DN_NR:
645 case DN_RJ:
646 case DN_DIC:
647 case DN_CN:
648 case DN_DRC:
649 case DN_CI:
650 case DN_CD:
651 scp->persist_fxn = dn_destroy_timer;
652 scp->persist = dn_nsp_persist(sk);
653 break;
654 default:
655 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
656 case DN_O:
657 dn_stop_slow_timer(sk);
658
659 dn_unhash_sock_bh(sk);
660 sock_put(sk);
661
662 break;
663 }
664 }
665
dn_addr2asc(__u16 addr,char * buf)666 char *dn_addr2asc(__u16 addr, char *buf)
667 {
668 unsigned short node, area;
669
670 node = addr & 0x03ff;
671 area = addr >> 10;
672 sprintf(buf, "%hd.%hd", area, node);
673
674 return buf;
675 }
676
677
678
dn_create(struct net * net,struct socket * sock,int protocol,int kern)679 static int dn_create(struct net *net, struct socket *sock, int protocol,
680 int kern)
681 {
682 struct sock *sk;
683
684 if (!net_eq(net, &init_net))
685 return -EAFNOSUPPORT;
686
687 switch (sock->type) {
688 case SOCK_SEQPACKET:
689 if (protocol != DNPROTO_NSP)
690 return -EPROTONOSUPPORT;
691 break;
692 case SOCK_STREAM:
693 break;
694 default:
695 return -ESOCKTNOSUPPORT;
696 }
697
698
699 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
700 return -ENOBUFS;
701
702 sk->sk_protocol = protocol;
703
704 return 0;
705 }
706
707
708 static int
dn_release(struct socket * sock)709 dn_release(struct socket *sock)
710 {
711 struct sock *sk = sock->sk;
712
713 if (sk) {
714 sock_orphan(sk);
715 sock_hold(sk);
716 lock_sock(sk);
717 dn_destroy_sock(sk);
718 release_sock(sk);
719 sock_put(sk);
720 }
721
722 return 0;
723 }
724
dn_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)725 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
726 {
727 struct sock *sk = sock->sk;
728 struct dn_scp *scp = DN_SK(sk);
729 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
730 struct net_device *dev, *ldev;
731 int rv;
732
733 if (addr_len != sizeof(struct sockaddr_dn))
734 return -EINVAL;
735
736 if (saddr->sdn_family != AF_DECnet)
737 return -EINVAL;
738
739 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
740 return -EINVAL;
741
742 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
743 return -EINVAL;
744
745 if (saddr->sdn_flags & ~SDF_WILD)
746 return -EINVAL;
747
748 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
749 (saddr->sdn_flags & SDF_WILD)))
750 return -EACCES;
751
752 if (!(saddr->sdn_flags & SDF_WILD)) {
753 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
754 rcu_read_lock();
755 ldev = NULL;
756 for_each_netdev_rcu(&init_net, dev) {
757 if (!dev->dn_ptr)
758 continue;
759 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
760 ldev = dev;
761 break;
762 }
763 }
764 rcu_read_unlock();
765 if (ldev == NULL)
766 return -EADDRNOTAVAIL;
767 }
768 }
769
770 rv = -EINVAL;
771 lock_sock(sk);
772 if (sock_flag(sk, SOCK_ZAPPED)) {
773 memcpy(&scp->addr, saddr, addr_len);
774 sock_reset_flag(sk, SOCK_ZAPPED);
775
776 rv = dn_hash_sock(sk);
777 if (rv)
778 sock_set_flag(sk, SOCK_ZAPPED);
779 }
780 release_sock(sk);
781
782 return rv;
783 }
784
785
dn_auto_bind(struct socket * sock)786 static int dn_auto_bind(struct socket *sock)
787 {
788 struct sock *sk = sock->sk;
789 struct dn_scp *scp = DN_SK(sk);
790 int rv;
791
792 sock_reset_flag(sk, SOCK_ZAPPED);
793
794 scp->addr.sdn_flags = 0;
795 scp->addr.sdn_objnum = 0;
796
797 /*
798 * This stuff is to keep compatibility with Eduardo's
799 * patch. I hope I can dispense with it shortly...
800 */
801 if ((scp->accessdata.acc_accl != 0) &&
802 (scp->accessdata.acc_accl <= 12)) {
803
804 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
805 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
806
807 scp->accessdata.acc_accl = 0;
808 memset(scp->accessdata.acc_acc, 0, 40);
809 }
810 /* End of compatibility stuff */
811
812 scp->addr.sdn_add.a_len = cpu_to_le16(2);
813 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
814 if (rv == 0) {
815 rv = dn_hash_sock(sk);
816 if (rv)
817 sock_set_flag(sk, SOCK_ZAPPED);
818 }
819
820 return rv;
821 }
822
dn_confirm_accept(struct sock * sk,long * timeo,gfp_t allocation)823 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
824 {
825 struct dn_scp *scp = DN_SK(sk);
826 DEFINE_WAIT(wait);
827 int err;
828
829 if (scp->state != DN_CR)
830 return -EINVAL;
831
832 scp->state = DN_CC;
833 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
834 dn_send_conn_conf(sk, allocation);
835
836 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
837 for(;;) {
838 release_sock(sk);
839 if (scp->state == DN_CC)
840 *timeo = schedule_timeout(*timeo);
841 lock_sock(sk);
842 err = 0;
843 if (scp->state == DN_RUN)
844 break;
845 err = sock_error(sk);
846 if (err)
847 break;
848 err = sock_intr_errno(*timeo);
849 if (signal_pending(current))
850 break;
851 err = -EAGAIN;
852 if (!*timeo)
853 break;
854 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
855 }
856 finish_wait(sk_sleep(sk), &wait);
857 if (err == 0) {
858 sk->sk_socket->state = SS_CONNECTED;
859 } else if (scp->state != DN_CC) {
860 sk->sk_socket->state = SS_UNCONNECTED;
861 }
862 return err;
863 }
864
dn_wait_run(struct sock * sk,long * timeo)865 static int dn_wait_run(struct sock *sk, long *timeo)
866 {
867 struct dn_scp *scp = DN_SK(sk);
868 DEFINE_WAIT(wait);
869 int err = 0;
870
871 if (scp->state == DN_RUN)
872 goto out;
873
874 if (!*timeo)
875 return -EALREADY;
876
877 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
878 for(;;) {
879 release_sock(sk);
880 if (scp->state == DN_CI || scp->state == DN_CC)
881 *timeo = schedule_timeout(*timeo);
882 lock_sock(sk);
883 err = 0;
884 if (scp->state == DN_RUN)
885 break;
886 err = sock_error(sk);
887 if (err)
888 break;
889 err = sock_intr_errno(*timeo);
890 if (signal_pending(current))
891 break;
892 err = -ETIMEDOUT;
893 if (!*timeo)
894 break;
895 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
896 }
897 finish_wait(sk_sleep(sk), &wait);
898 out:
899 if (err == 0) {
900 sk->sk_socket->state = SS_CONNECTED;
901 } else if (scp->state != DN_CI && scp->state != DN_CC) {
902 sk->sk_socket->state = SS_UNCONNECTED;
903 }
904 return err;
905 }
906
__dn_connect(struct sock * sk,struct sockaddr_dn * addr,int addrlen,long * timeo,int flags)907 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
908 {
909 struct socket *sock = sk->sk_socket;
910 struct dn_scp *scp = DN_SK(sk);
911 int err = -EISCONN;
912 struct flowidn fld;
913
914 if (sock->state == SS_CONNECTED)
915 goto out;
916
917 if (sock->state == SS_CONNECTING) {
918 err = 0;
919 if (scp->state == DN_RUN) {
920 sock->state = SS_CONNECTED;
921 goto out;
922 }
923 err = -ECONNREFUSED;
924 if (scp->state != DN_CI && scp->state != DN_CC) {
925 sock->state = SS_UNCONNECTED;
926 goto out;
927 }
928 return dn_wait_run(sk, timeo);
929 }
930
931 err = -EINVAL;
932 if (scp->state != DN_O)
933 goto out;
934
935 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
936 goto out;
937 if (addr->sdn_family != AF_DECnet)
938 goto out;
939 if (addr->sdn_flags & SDF_WILD)
940 goto out;
941
942 if (sock_flag(sk, SOCK_ZAPPED)) {
943 err = dn_auto_bind(sk->sk_socket);
944 if (err)
945 goto out;
946 }
947
948 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
949
950 err = -EHOSTUNREACH;
951 memset(&fld, 0, sizeof(fld));
952 fld.flowidn_oif = sk->sk_bound_dev_if;
953 fld.daddr = dn_saddr2dn(&scp->peer);
954 fld.saddr = dn_saddr2dn(&scp->addr);
955 dn_sk_ports_copy(&fld, scp);
956 fld.flowidn_proto = DNPROTO_NSP;
957 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
958 goto out;
959 sk->sk_route_caps = sk->sk_dst_cache->dev->features;
960 sock->state = SS_CONNECTING;
961 scp->state = DN_CI;
962 scp->segsize_loc = dst_metric_advmss(sk->sk_dst_cache);
963
964 dn_nsp_send_conninit(sk, NSP_CI);
965 err = -EINPROGRESS;
966 if (*timeo) {
967 err = dn_wait_run(sk, timeo);
968 }
969 out:
970 return err;
971 }
972
dn_connect(struct socket * sock,struct sockaddr * uaddr,int addrlen,int flags)973 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
974 {
975 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
976 struct sock *sk = sock->sk;
977 int err;
978 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
979
980 lock_sock(sk);
981 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
982 release_sock(sk);
983
984 return err;
985 }
986
dn_check_state(struct sock * sk,struct sockaddr_dn * addr,int addrlen,long * timeo,int flags)987 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
988 {
989 struct dn_scp *scp = DN_SK(sk);
990
991 switch (scp->state) {
992 case DN_RUN:
993 return 0;
994 case DN_CR:
995 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
996 case DN_CI:
997 case DN_CC:
998 return dn_wait_run(sk, timeo);
999 case DN_O:
1000 return __dn_connect(sk, addr, addrlen, timeo, flags);
1001 }
1002
1003 return -EINVAL;
1004 }
1005
1006
dn_access_copy(struct sk_buff * skb,struct accessdata_dn * acc)1007 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1008 {
1009 unsigned char *ptr = skb->data;
1010
1011 acc->acc_userl = *ptr++;
1012 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1013 ptr += acc->acc_userl;
1014
1015 acc->acc_passl = *ptr++;
1016 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1017 ptr += acc->acc_passl;
1018
1019 acc->acc_accl = *ptr++;
1020 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1021
1022 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1023
1024 }
1025
dn_user_copy(struct sk_buff * skb,struct optdata_dn * opt)1026 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1027 {
1028 unsigned char *ptr = skb->data;
1029 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1030
1031 BUG_ON(len > 16); /* we've checked the contents earlier */
1032 opt->opt_optl = cpu_to_le16(len);
1033 opt->opt_status = 0;
1034 memcpy(opt->opt_data, ptr, len);
1035 skb_pull(skb, len + 1);
1036 }
1037
dn_wait_for_connect(struct sock * sk,long * timeo)1038 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1039 {
1040 DEFINE_WAIT(wait);
1041 struct sk_buff *skb = NULL;
1042 int err = 0;
1043
1044 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1045 for(;;) {
1046 release_sock(sk);
1047 skb = skb_dequeue(&sk->sk_receive_queue);
1048 if (skb == NULL) {
1049 *timeo = schedule_timeout(*timeo);
1050 skb = skb_dequeue(&sk->sk_receive_queue);
1051 }
1052 lock_sock(sk);
1053 if (skb != NULL)
1054 break;
1055 err = -EINVAL;
1056 if (sk->sk_state != TCP_LISTEN)
1057 break;
1058 err = sock_intr_errno(*timeo);
1059 if (signal_pending(current))
1060 break;
1061 err = -EAGAIN;
1062 if (!*timeo)
1063 break;
1064 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1065 }
1066 finish_wait(sk_sleep(sk), &wait);
1067
1068 return skb == NULL ? ERR_PTR(err) : skb;
1069 }
1070
dn_accept(struct socket * sock,struct socket * newsock,int flags)1071 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1072 {
1073 struct sock *sk = sock->sk, *newsk;
1074 struct sk_buff *skb = NULL;
1075 struct dn_skb_cb *cb;
1076 unsigned char menuver;
1077 int err = 0;
1078 unsigned char type;
1079 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1080 struct dst_entry *dst;
1081
1082 lock_sock(sk);
1083
1084 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1085 release_sock(sk);
1086 return -EINVAL;
1087 }
1088
1089 skb = skb_dequeue(&sk->sk_receive_queue);
1090 if (skb == NULL) {
1091 skb = dn_wait_for_connect(sk, &timeo);
1092 if (IS_ERR(skb)) {
1093 release_sock(sk);
1094 return PTR_ERR(skb);
1095 }
1096 }
1097
1098 cb = DN_SKB_CB(skb);
1099 sk->sk_ack_backlog--;
1100 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1101 if (newsk == NULL) {
1102 release_sock(sk);
1103 kfree_skb(skb);
1104 return -ENOBUFS;
1105 }
1106 release_sock(sk);
1107
1108 dst = skb_dst(skb);
1109 sk_dst_set(newsk, dst);
1110 skb_dst_set(skb, NULL);
1111
1112 DN_SK(newsk)->state = DN_CR;
1113 DN_SK(newsk)->addrrem = cb->src_port;
1114 DN_SK(newsk)->services_rem = cb->services;
1115 DN_SK(newsk)->info_rem = cb->info;
1116 DN_SK(newsk)->segsize_rem = cb->segsize;
1117 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1118
1119 if (DN_SK(newsk)->segsize_rem < 230)
1120 DN_SK(newsk)->segsize_rem = 230;
1121
1122 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1123 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1124
1125 newsk->sk_state = TCP_LISTEN;
1126 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1127
1128 /*
1129 * If we are listening on a wild socket, we don't want
1130 * the newly created socket on the wrong hash queue.
1131 */
1132 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1133
1134 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1135 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1136 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1137 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1138
1139 menuver = *skb->data;
1140 skb_pull(skb, 1);
1141
1142 if (menuver & DN_MENUVER_ACC)
1143 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1144
1145 if (menuver & DN_MENUVER_USR)
1146 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1147
1148 if (menuver & DN_MENUVER_PRX)
1149 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1150
1151 if (menuver & DN_MENUVER_UIC)
1152 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1153
1154 kfree_skb(skb);
1155
1156 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1157 sizeof(struct optdata_dn));
1158 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1159 sizeof(struct optdata_dn));
1160
1161 lock_sock(newsk);
1162 err = dn_hash_sock(newsk);
1163 if (err == 0) {
1164 sock_reset_flag(newsk, SOCK_ZAPPED);
1165 dn_send_conn_ack(newsk);
1166
1167 /*
1168 * Here we use sk->sk_allocation since although the conn conf is
1169 * for the newsk, the context is the old socket.
1170 */
1171 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1172 err = dn_confirm_accept(newsk, &timeo,
1173 sk->sk_allocation);
1174 }
1175 release_sock(newsk);
1176 return err;
1177 }
1178
1179
dn_getname(struct socket * sock,struct sockaddr * uaddr,int * uaddr_len,int peer)1180 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1181 {
1182 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1183 struct sock *sk = sock->sk;
1184 struct dn_scp *scp = DN_SK(sk);
1185
1186 *uaddr_len = sizeof(struct sockaddr_dn);
1187
1188 lock_sock(sk);
1189
1190 if (peer) {
1191 if ((sock->state != SS_CONNECTED &&
1192 sock->state != SS_CONNECTING) &&
1193 scp->accept_mode == ACC_IMMED) {
1194 release_sock(sk);
1195 return -ENOTCONN;
1196 }
1197
1198 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1199 } else {
1200 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1201 }
1202
1203 release_sock(sk);
1204
1205 return 0;
1206 }
1207
1208
dn_poll(struct file * file,struct socket * sock,poll_table * wait)1209 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1210 {
1211 struct sock *sk = sock->sk;
1212 struct dn_scp *scp = DN_SK(sk);
1213 int mask = datagram_poll(file, sock, wait);
1214
1215 if (!skb_queue_empty(&scp->other_receive_queue))
1216 mask |= POLLRDBAND;
1217
1218 return mask;
1219 }
1220
dn_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1221 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1222 {
1223 struct sock *sk = sock->sk;
1224 struct dn_scp *scp = DN_SK(sk);
1225 int err = -EOPNOTSUPP;
1226 long amount = 0;
1227 struct sk_buff *skb;
1228 int val;
1229
1230 switch(cmd)
1231 {
1232 case SIOCGIFADDR:
1233 case SIOCSIFADDR:
1234 return dn_dev_ioctl(cmd, (void __user *)arg);
1235
1236 case SIOCATMARK:
1237 lock_sock(sk);
1238 val = !skb_queue_empty(&scp->other_receive_queue);
1239 if (scp->state != DN_RUN)
1240 val = -ENOTCONN;
1241 release_sock(sk);
1242 return val;
1243
1244 case TIOCOUTQ:
1245 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1246 if (amount < 0)
1247 amount = 0;
1248 err = put_user(amount, (int __user *)arg);
1249 break;
1250
1251 case TIOCINQ:
1252 lock_sock(sk);
1253 skb = skb_peek(&scp->other_receive_queue);
1254 if (skb) {
1255 amount = skb->len;
1256 } else {
1257 skb_queue_walk(&sk->sk_receive_queue, skb)
1258 amount += skb->len;
1259 }
1260 release_sock(sk);
1261 err = put_user(amount, (int __user *)arg);
1262 break;
1263
1264 default:
1265 err = -ENOIOCTLCMD;
1266 break;
1267 }
1268
1269 return err;
1270 }
1271
dn_listen(struct socket * sock,int backlog)1272 static int dn_listen(struct socket *sock, int backlog)
1273 {
1274 struct sock *sk = sock->sk;
1275 int err = -EINVAL;
1276
1277 lock_sock(sk);
1278
1279 if (sock_flag(sk, SOCK_ZAPPED))
1280 goto out;
1281
1282 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1283 goto out;
1284
1285 sk->sk_max_ack_backlog = backlog;
1286 sk->sk_ack_backlog = 0;
1287 sk->sk_state = TCP_LISTEN;
1288 err = 0;
1289 dn_rehash_sock(sk);
1290
1291 out:
1292 release_sock(sk);
1293
1294 return err;
1295 }
1296
1297
dn_shutdown(struct socket * sock,int how)1298 static int dn_shutdown(struct socket *sock, int how)
1299 {
1300 struct sock *sk = sock->sk;
1301 struct dn_scp *scp = DN_SK(sk);
1302 int err = -ENOTCONN;
1303
1304 lock_sock(sk);
1305
1306 if (sock->state == SS_UNCONNECTED)
1307 goto out;
1308
1309 err = 0;
1310 if (sock->state == SS_DISCONNECTING)
1311 goto out;
1312
1313 err = -EINVAL;
1314 if (scp->state == DN_O)
1315 goto out;
1316
1317 if (how != SHUTDOWN_MASK)
1318 goto out;
1319
1320 sk->sk_shutdown = how;
1321 dn_destroy_sock(sk);
1322 err = 0;
1323
1324 out:
1325 release_sock(sk);
1326
1327 return err;
1328 }
1329
dn_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)1330 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1331 {
1332 struct sock *sk = sock->sk;
1333 int err;
1334
1335 lock_sock(sk);
1336 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1337 release_sock(sk);
1338
1339 return err;
1340 }
1341
__dn_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen,int flags)1342 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1343 {
1344 struct sock *sk = sock->sk;
1345 struct dn_scp *scp = DN_SK(sk);
1346 long timeo;
1347 union {
1348 struct optdata_dn opt;
1349 struct accessdata_dn acc;
1350 int mode;
1351 unsigned long win;
1352 int val;
1353 unsigned char services;
1354 unsigned char info;
1355 } u;
1356 int err;
1357
1358 if (optlen && !optval)
1359 return -EINVAL;
1360
1361 if (optlen > sizeof(u))
1362 return -EINVAL;
1363
1364 if (copy_from_user(&u, optval, optlen))
1365 return -EFAULT;
1366
1367 switch (optname) {
1368 case DSO_CONDATA:
1369 if (sock->state == SS_CONNECTED)
1370 return -EISCONN;
1371 if ((scp->state != DN_O) && (scp->state != DN_CR))
1372 return -EINVAL;
1373
1374 if (optlen != sizeof(struct optdata_dn))
1375 return -EINVAL;
1376
1377 if (le16_to_cpu(u.opt.opt_optl) > 16)
1378 return -EINVAL;
1379
1380 memcpy(&scp->conndata_out, &u.opt, optlen);
1381 break;
1382
1383 case DSO_DISDATA:
1384 if (sock->state != SS_CONNECTED &&
1385 scp->accept_mode == ACC_IMMED)
1386 return -ENOTCONN;
1387
1388 if (optlen != sizeof(struct optdata_dn))
1389 return -EINVAL;
1390
1391 if (le16_to_cpu(u.opt.opt_optl) > 16)
1392 return -EINVAL;
1393
1394 memcpy(&scp->discdata_out, &u.opt, optlen);
1395 break;
1396
1397 case DSO_CONACCESS:
1398 if (sock->state == SS_CONNECTED)
1399 return -EISCONN;
1400 if (scp->state != DN_O)
1401 return -EINVAL;
1402
1403 if (optlen != sizeof(struct accessdata_dn))
1404 return -EINVAL;
1405
1406 if ((u.acc.acc_accl > DN_MAXACCL) ||
1407 (u.acc.acc_passl > DN_MAXACCL) ||
1408 (u.acc.acc_userl > DN_MAXACCL))
1409 return -EINVAL;
1410
1411 memcpy(&scp->accessdata, &u.acc, optlen);
1412 break;
1413
1414 case DSO_ACCEPTMODE:
1415 if (sock->state == SS_CONNECTED)
1416 return -EISCONN;
1417 if (scp->state != DN_O)
1418 return -EINVAL;
1419
1420 if (optlen != sizeof(int))
1421 return -EINVAL;
1422
1423 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1424 return -EINVAL;
1425
1426 scp->accept_mode = (unsigned char)u.mode;
1427 break;
1428
1429 case DSO_CONACCEPT:
1430 if (scp->state != DN_CR)
1431 return -EINVAL;
1432 timeo = sock_rcvtimeo(sk, 0);
1433 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1434 return err;
1435
1436 case DSO_CONREJECT:
1437 if (scp->state != DN_CR)
1438 return -EINVAL;
1439
1440 scp->state = DN_DR;
1441 sk->sk_shutdown = SHUTDOWN_MASK;
1442 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1443 break;
1444
1445 default:
1446 #ifdef CONFIG_NETFILTER
1447 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1448 #endif
1449 case DSO_LINKINFO:
1450 case DSO_STREAM:
1451 case DSO_SEQPACKET:
1452 return -ENOPROTOOPT;
1453
1454 case DSO_MAXWINDOW:
1455 if (optlen != sizeof(unsigned long))
1456 return -EINVAL;
1457 if (u.win > NSP_MAX_WINDOW)
1458 u.win = NSP_MAX_WINDOW;
1459 if (u.win == 0)
1460 return -EINVAL;
1461 scp->max_window = u.win;
1462 if (scp->snd_window > u.win)
1463 scp->snd_window = u.win;
1464 break;
1465
1466 case DSO_NODELAY:
1467 if (optlen != sizeof(int))
1468 return -EINVAL;
1469 if (scp->nonagle == 2)
1470 return -EINVAL;
1471 scp->nonagle = (u.val == 0) ? 0 : 1;
1472 /* if (scp->nonagle == 1) { Push pending frames } */
1473 break;
1474
1475 case DSO_CORK:
1476 if (optlen != sizeof(int))
1477 return -EINVAL;
1478 if (scp->nonagle == 1)
1479 return -EINVAL;
1480 scp->nonagle = (u.val == 0) ? 0 : 2;
1481 /* if (scp->nonagle == 0) { Push pending frames } */
1482 break;
1483
1484 case DSO_SERVICES:
1485 if (optlen != sizeof(unsigned char))
1486 return -EINVAL;
1487 if ((u.services & ~NSP_FC_MASK) != 0x01)
1488 return -EINVAL;
1489 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1490 return -EINVAL;
1491 scp->services_loc = u.services;
1492 break;
1493
1494 case DSO_INFO:
1495 if (optlen != sizeof(unsigned char))
1496 return -EINVAL;
1497 if (u.info & 0xfc)
1498 return -EINVAL;
1499 scp->info_loc = u.info;
1500 break;
1501 }
1502
1503 return 0;
1504 }
1505
dn_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)1506 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1507 {
1508 struct sock *sk = sock->sk;
1509 int err;
1510
1511 lock_sock(sk);
1512 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1513 release_sock(sk);
1514
1515 return err;
1516 }
1517
__dn_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen,int flags)1518 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1519 {
1520 struct sock *sk = sock->sk;
1521 struct dn_scp *scp = DN_SK(sk);
1522 struct linkinfo_dn link;
1523 unsigned int r_len;
1524 void *r_data = NULL;
1525 unsigned int val;
1526
1527 if(get_user(r_len , optlen))
1528 return -EFAULT;
1529
1530 switch (optname) {
1531 case DSO_CONDATA:
1532 if (r_len > sizeof(struct optdata_dn))
1533 r_len = sizeof(struct optdata_dn);
1534 r_data = &scp->conndata_in;
1535 break;
1536
1537 case DSO_DISDATA:
1538 if (r_len > sizeof(struct optdata_dn))
1539 r_len = sizeof(struct optdata_dn);
1540 r_data = &scp->discdata_in;
1541 break;
1542
1543 case DSO_CONACCESS:
1544 if (r_len > sizeof(struct accessdata_dn))
1545 r_len = sizeof(struct accessdata_dn);
1546 r_data = &scp->accessdata;
1547 break;
1548
1549 case DSO_ACCEPTMODE:
1550 if (r_len > sizeof(unsigned char))
1551 r_len = sizeof(unsigned char);
1552 r_data = &scp->accept_mode;
1553 break;
1554
1555 case DSO_LINKINFO:
1556 if (r_len > sizeof(struct linkinfo_dn))
1557 r_len = sizeof(struct linkinfo_dn);
1558
1559 memset(&link, 0, sizeof(link));
1560
1561 switch (sock->state) {
1562 case SS_CONNECTING:
1563 link.idn_linkstate = LL_CONNECTING;
1564 break;
1565 case SS_DISCONNECTING:
1566 link.idn_linkstate = LL_DISCONNECTING;
1567 break;
1568 case SS_CONNECTED:
1569 link.idn_linkstate = LL_RUNNING;
1570 break;
1571 default:
1572 link.idn_linkstate = LL_INACTIVE;
1573 }
1574
1575 link.idn_segsize = scp->segsize_rem;
1576 r_data = &link;
1577 break;
1578
1579 default:
1580 #ifdef CONFIG_NETFILTER
1581 {
1582 int ret, len;
1583
1584 if (get_user(len, optlen))
1585 return -EFAULT;
1586
1587 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1588 if (ret >= 0)
1589 ret = put_user(len, optlen);
1590 return ret;
1591 }
1592 #endif
1593 case DSO_STREAM:
1594 case DSO_SEQPACKET:
1595 case DSO_CONACCEPT:
1596 case DSO_CONREJECT:
1597 return -ENOPROTOOPT;
1598
1599 case DSO_MAXWINDOW:
1600 if (r_len > sizeof(unsigned long))
1601 r_len = sizeof(unsigned long);
1602 r_data = &scp->max_window;
1603 break;
1604
1605 case DSO_NODELAY:
1606 if (r_len > sizeof(int))
1607 r_len = sizeof(int);
1608 val = (scp->nonagle == 1);
1609 r_data = &val;
1610 break;
1611
1612 case DSO_CORK:
1613 if (r_len > sizeof(int))
1614 r_len = sizeof(int);
1615 val = (scp->nonagle == 2);
1616 r_data = &val;
1617 break;
1618
1619 case DSO_SERVICES:
1620 if (r_len > sizeof(unsigned char))
1621 r_len = sizeof(unsigned char);
1622 r_data = &scp->services_rem;
1623 break;
1624
1625 case DSO_INFO:
1626 if (r_len > sizeof(unsigned char))
1627 r_len = sizeof(unsigned char);
1628 r_data = &scp->info_rem;
1629 break;
1630 }
1631
1632 if (r_data) {
1633 if (copy_to_user(optval, r_data, r_len))
1634 return -EFAULT;
1635 if (put_user(r_len, optlen))
1636 return -EFAULT;
1637 }
1638
1639 return 0;
1640 }
1641
1642
dn_data_ready(struct sock * sk,struct sk_buff_head * q,int flags,int target)1643 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1644 {
1645 struct sk_buff *skb;
1646 int len = 0;
1647
1648 if (flags & MSG_OOB)
1649 return !skb_queue_empty(q) ? 1 : 0;
1650
1651 skb_queue_walk(q, skb) {
1652 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1653 len += skb->len;
1654
1655 if (cb->nsp_flags & 0x40) {
1656 /* SOCK_SEQPACKET reads to EOM */
1657 if (sk->sk_type == SOCK_SEQPACKET)
1658 return 1;
1659 /* so does SOCK_STREAM unless WAITALL is specified */
1660 if (!(flags & MSG_WAITALL))
1661 return 1;
1662 }
1663
1664 /* minimum data length for read exceeded */
1665 if (len >= target)
1666 return 1;
1667 }
1668
1669 return 0;
1670 }
1671
1672
dn_recvmsg(struct kiocb * iocb,struct socket * sock,struct msghdr * msg,size_t size,int flags)1673 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1674 struct msghdr *msg, size_t size, int flags)
1675 {
1676 struct sock *sk = sock->sk;
1677 struct dn_scp *scp = DN_SK(sk);
1678 struct sk_buff_head *queue = &sk->sk_receive_queue;
1679 size_t target = size > 1 ? 1 : 0;
1680 size_t copied = 0;
1681 int rv = 0;
1682 struct sk_buff *skb, *n;
1683 struct dn_skb_cb *cb = NULL;
1684 unsigned char eor = 0;
1685 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1686
1687 lock_sock(sk);
1688
1689 if (sock_flag(sk, SOCK_ZAPPED)) {
1690 rv = -EADDRNOTAVAIL;
1691 goto out;
1692 }
1693
1694 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1695 rv = 0;
1696 goto out;
1697 }
1698
1699 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1700 if (rv)
1701 goto out;
1702
1703 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1704 rv = -EOPNOTSUPP;
1705 goto out;
1706 }
1707
1708 if (flags & MSG_OOB)
1709 queue = &scp->other_receive_queue;
1710
1711 if (flags & MSG_WAITALL)
1712 target = size;
1713
1714
1715 /*
1716 * See if there is data ready to read, sleep if there isn't
1717 */
1718 for(;;) {
1719 DEFINE_WAIT(wait);
1720
1721 if (sk->sk_err)
1722 goto out;
1723
1724 if (!skb_queue_empty(&scp->other_receive_queue)) {
1725 if (!(flags & MSG_OOB)) {
1726 msg->msg_flags |= MSG_OOB;
1727 if (!scp->other_report) {
1728 scp->other_report = 1;
1729 goto out;
1730 }
1731 }
1732 }
1733
1734 if (scp->state != DN_RUN)
1735 goto out;
1736
1737 if (signal_pending(current)) {
1738 rv = sock_intr_errno(timeo);
1739 goto out;
1740 }
1741
1742 if (dn_data_ready(sk, queue, flags, target))
1743 break;
1744
1745 if (flags & MSG_DONTWAIT) {
1746 rv = -EWOULDBLOCK;
1747 goto out;
1748 }
1749
1750 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1751 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1752 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1753 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1754 finish_wait(sk_sleep(sk), &wait);
1755 }
1756
1757 skb_queue_walk_safe(queue, skb, n) {
1758 unsigned int chunk = skb->len;
1759 cb = DN_SKB_CB(skb);
1760
1761 if ((chunk + copied) > size)
1762 chunk = size - copied;
1763
1764 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1765 rv = -EFAULT;
1766 break;
1767 }
1768 copied += chunk;
1769
1770 if (!(flags & MSG_PEEK))
1771 skb_pull(skb, chunk);
1772
1773 eor = cb->nsp_flags & 0x40;
1774
1775 if (skb->len == 0) {
1776 skb_unlink(skb, queue);
1777 kfree_skb(skb);
1778 /*
1779 * N.B. Don't refer to skb or cb after this point
1780 * in loop.
1781 */
1782 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1783 scp->flowloc_sw = DN_SEND;
1784 dn_nsp_send_link(sk, DN_SEND, 0);
1785 }
1786 }
1787
1788 if (eor) {
1789 if (sk->sk_type == SOCK_SEQPACKET)
1790 break;
1791 if (!(flags & MSG_WAITALL))
1792 break;
1793 }
1794
1795 if (flags & MSG_OOB)
1796 break;
1797
1798 if (copied >= target)
1799 break;
1800 }
1801
1802 rv = copied;
1803
1804
1805 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1806 msg->msg_flags |= MSG_EOR;
1807
1808 out:
1809 if (rv == 0)
1810 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1811
1812 if ((rv >= 0) && msg->msg_name) {
1813 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1814 msg->msg_namelen = sizeof(struct sockaddr_dn);
1815 }
1816
1817 release_sock(sk);
1818
1819 return rv;
1820 }
1821
1822
dn_queue_too_long(struct dn_scp * scp,struct sk_buff_head * queue,int flags)1823 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1824 {
1825 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1826 if (skb_queue_len(queue) >= scp->snd_window)
1827 return 1;
1828 if (fctype != NSP_FC_NONE) {
1829 if (flags & MSG_OOB) {
1830 if (scp->flowrem_oth == 0)
1831 return 1;
1832 } else {
1833 if (scp->flowrem_dat == 0)
1834 return 1;
1835 }
1836 }
1837 return 0;
1838 }
1839
1840 /*
1841 * The DECnet spec requires that the "routing layer" accepts packets which
1842 * are at least 230 bytes in size. This excludes any headers which the NSP
1843 * layer might add, so we always assume that we'll be using the maximal
1844 * length header on data packets. The variation in length is due to the
1845 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1846 * make much practical difference.
1847 */
dn_mss_from_pmtu(struct net_device * dev,int mtu)1848 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1849 {
1850 unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1851 if (dev) {
1852 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1853 mtu -= LL_RESERVED_SPACE(dev);
1854 if (dn_db->use_long)
1855 mtu -= 21;
1856 else
1857 mtu -= 6;
1858 mtu -= DN_MAX_NSP_DATA_HEADER;
1859 } else {
1860 /*
1861 * 21 = long header, 16 = guess at MAC header length
1862 */
1863 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1864 }
1865 if (mtu > mss)
1866 mss = mtu;
1867 return mss;
1868 }
1869
dn_current_mss(struct sock * sk,int flags)1870 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1871 {
1872 struct dst_entry *dst = __sk_dst_get(sk);
1873 struct dn_scp *scp = DN_SK(sk);
1874 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1875
1876 /* Other data messages are limited to 16 bytes per packet */
1877 if (flags & MSG_OOB)
1878 return 16;
1879
1880 /* This works out the maximum size of segment we can send out */
1881 if (dst) {
1882 u32 mtu = dst_mtu(dst);
1883 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1884 }
1885
1886 return mss_now;
1887 }
1888
1889 /*
1890 * N.B. We get the timeout wrong here, but then we always did get it
1891 * wrong before and this is another step along the road to correcting
1892 * it. It ought to get updated each time we pass through the routine,
1893 * but in practise it probably doesn't matter too much for now.
1894 */
dn_alloc_send_pskb(struct sock * sk,unsigned long datalen,int noblock,int * errcode)1895 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1896 unsigned long datalen, int noblock,
1897 int *errcode)
1898 {
1899 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1900 noblock, errcode);
1901 if (skb) {
1902 skb->protocol = htons(ETH_P_DNA_RT);
1903 skb->pkt_type = PACKET_OUTGOING;
1904 }
1905 return skb;
1906 }
1907
dn_sendmsg(struct kiocb * iocb,struct socket * sock,struct msghdr * msg,size_t size)1908 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1909 struct msghdr *msg, size_t size)
1910 {
1911 struct sock *sk = sock->sk;
1912 struct dn_scp *scp = DN_SK(sk);
1913 size_t mss;
1914 struct sk_buff_head *queue = &scp->data_xmit_queue;
1915 int flags = msg->msg_flags;
1916 int err = 0;
1917 size_t sent = 0;
1918 int addr_len = msg->msg_namelen;
1919 struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1920 struct sk_buff *skb = NULL;
1921 struct dn_skb_cb *cb;
1922 size_t len;
1923 unsigned char fctype;
1924 long timeo;
1925
1926 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1927 return -EOPNOTSUPP;
1928
1929 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1930 return -EINVAL;
1931
1932 lock_sock(sk);
1933 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1934 /*
1935 * The only difference between stream sockets and sequenced packet
1936 * sockets is that the stream sockets always behave as if MSG_EOR
1937 * has been set.
1938 */
1939 if (sock->type == SOCK_STREAM) {
1940 if (flags & MSG_EOR) {
1941 err = -EINVAL;
1942 goto out;
1943 }
1944 flags |= MSG_EOR;
1945 }
1946
1947
1948 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1949 if (err)
1950 goto out_err;
1951
1952 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1953 err = -EPIPE;
1954 if (!(flags & MSG_NOSIGNAL))
1955 send_sig(SIGPIPE, current, 0);
1956 goto out_err;
1957 }
1958
1959 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1960 dst_negative_advice(sk);
1961
1962 mss = scp->segsize_rem;
1963 fctype = scp->services_rem & NSP_FC_MASK;
1964
1965 mss = dn_current_mss(sk, flags);
1966
1967 if (flags & MSG_OOB) {
1968 queue = &scp->other_xmit_queue;
1969 if (size > mss) {
1970 err = -EMSGSIZE;
1971 goto out;
1972 }
1973 }
1974
1975 scp->persist_fxn = dn_nsp_xmit_timeout;
1976
1977 while(sent < size) {
1978 err = sock_error(sk);
1979 if (err)
1980 goto out;
1981
1982 if (signal_pending(current)) {
1983 err = sock_intr_errno(timeo);
1984 goto out;
1985 }
1986
1987 /*
1988 * Calculate size that we wish to send.
1989 */
1990 len = size - sent;
1991
1992 if (len > mss)
1993 len = mss;
1994
1995 /*
1996 * Wait for queue size to go down below the window
1997 * size.
1998 */
1999 if (dn_queue_too_long(scp, queue, flags)) {
2000 DEFINE_WAIT(wait);
2001
2002 if (flags & MSG_DONTWAIT) {
2003 err = -EWOULDBLOCK;
2004 goto out;
2005 }
2006
2007 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2008 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2009 sk_wait_event(sk, &timeo,
2010 !dn_queue_too_long(scp, queue, flags));
2011 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2012 finish_wait(sk_sleep(sk), &wait);
2013 continue;
2014 }
2015
2016 /*
2017 * Get a suitably sized skb.
2018 * 64 is a bit of a hack really, but its larger than any
2019 * link-layer headers and has served us well as a good
2020 * guess as to their real length.
2021 */
2022 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2023 flags & MSG_DONTWAIT, &err);
2024
2025 if (err)
2026 break;
2027
2028 if (!skb)
2029 continue;
2030
2031 cb = DN_SKB_CB(skb);
2032
2033 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2034
2035 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2036 err = -EFAULT;
2037 goto out;
2038 }
2039
2040 if (flags & MSG_OOB) {
2041 cb->nsp_flags = 0x30;
2042 if (fctype != NSP_FC_NONE)
2043 scp->flowrem_oth--;
2044 } else {
2045 cb->nsp_flags = 0x00;
2046 if (scp->seg_total == 0)
2047 cb->nsp_flags |= 0x20;
2048
2049 scp->seg_total += len;
2050
2051 if (((sent + len) == size) && (flags & MSG_EOR)) {
2052 cb->nsp_flags |= 0x40;
2053 scp->seg_total = 0;
2054 if (fctype == NSP_FC_SCMC)
2055 scp->flowrem_dat--;
2056 }
2057 if (fctype == NSP_FC_SRC)
2058 scp->flowrem_dat--;
2059 }
2060
2061 sent += len;
2062 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2063 skb = NULL;
2064
2065 scp->persist = dn_nsp_persist(sk);
2066
2067 }
2068 out:
2069
2070 kfree_skb(skb);
2071
2072 release_sock(sk);
2073
2074 return sent ? sent : err;
2075
2076 out_err:
2077 err = sk_stream_error(sk, flags, err);
2078 release_sock(sk);
2079 return err;
2080 }
2081
dn_device_event(struct notifier_block * this,unsigned long event,void * ptr)2082 static int dn_device_event(struct notifier_block *this, unsigned long event,
2083 void *ptr)
2084 {
2085 struct net_device *dev = (struct net_device *)ptr;
2086
2087 if (!net_eq(dev_net(dev), &init_net))
2088 return NOTIFY_DONE;
2089
2090 switch (event) {
2091 case NETDEV_UP:
2092 dn_dev_up(dev);
2093 break;
2094 case NETDEV_DOWN:
2095 dn_dev_down(dev);
2096 break;
2097 default:
2098 break;
2099 }
2100
2101 return NOTIFY_DONE;
2102 }
2103
2104 static struct notifier_block dn_dev_notifier = {
2105 .notifier_call = dn_device_event,
2106 };
2107
2108 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2109
2110 static struct packet_type dn_dix_packet_type __read_mostly = {
2111 .type = cpu_to_be16(ETH_P_DNA_RT),
2112 .func = dn_route_rcv,
2113 };
2114
2115 #ifdef CONFIG_PROC_FS
2116 struct dn_iter_state {
2117 int bucket;
2118 };
2119
dn_socket_get_first(struct seq_file * seq)2120 static struct sock *dn_socket_get_first(struct seq_file *seq)
2121 {
2122 struct dn_iter_state *state = seq->private;
2123 struct sock *n = NULL;
2124
2125 for(state->bucket = 0;
2126 state->bucket < DN_SK_HASH_SIZE;
2127 ++state->bucket) {
2128 n = sk_head(&dn_sk_hash[state->bucket]);
2129 if (n)
2130 break;
2131 }
2132
2133 return n;
2134 }
2135
dn_socket_get_next(struct seq_file * seq,struct sock * n)2136 static struct sock *dn_socket_get_next(struct seq_file *seq,
2137 struct sock *n)
2138 {
2139 struct dn_iter_state *state = seq->private;
2140
2141 n = sk_next(n);
2142 try_again:
2143 if (n)
2144 goto out;
2145 if (++state->bucket >= DN_SK_HASH_SIZE)
2146 goto out;
2147 n = sk_head(&dn_sk_hash[state->bucket]);
2148 goto try_again;
2149 out:
2150 return n;
2151 }
2152
socket_get_idx(struct seq_file * seq,loff_t * pos)2153 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2154 {
2155 struct sock *sk = dn_socket_get_first(seq);
2156
2157 if (sk) {
2158 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2159 --*pos;
2160 }
2161 return *pos ? NULL : sk;
2162 }
2163
dn_socket_get_idx(struct seq_file * seq,loff_t pos)2164 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2165 {
2166 void *rc;
2167 read_lock_bh(&dn_hash_lock);
2168 rc = socket_get_idx(seq, &pos);
2169 if (!rc) {
2170 read_unlock_bh(&dn_hash_lock);
2171 }
2172 return rc;
2173 }
2174
dn_socket_seq_start(struct seq_file * seq,loff_t * pos)2175 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2176 {
2177 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2178 }
2179
dn_socket_seq_next(struct seq_file * seq,void * v,loff_t * pos)2180 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2181 {
2182 void *rc;
2183
2184 if (v == SEQ_START_TOKEN) {
2185 rc = dn_socket_get_idx(seq, 0);
2186 goto out;
2187 }
2188
2189 rc = dn_socket_get_next(seq, v);
2190 if (rc)
2191 goto out;
2192 read_unlock_bh(&dn_hash_lock);
2193 out:
2194 ++*pos;
2195 return rc;
2196 }
2197
dn_socket_seq_stop(struct seq_file * seq,void * v)2198 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2199 {
2200 if (v && v != SEQ_START_TOKEN)
2201 read_unlock_bh(&dn_hash_lock);
2202 }
2203
2204 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2205
dn_printable_object(struct sockaddr_dn * dn,unsigned char * buf)2206 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2207 {
2208 int i;
2209
2210 switch (le16_to_cpu(dn->sdn_objnamel)) {
2211 case 0:
2212 sprintf(buf, "%d", dn->sdn_objnum);
2213 break;
2214 default:
2215 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2216 buf[i] = dn->sdn_objname[i];
2217 if (IS_NOT_PRINTABLE(buf[i]))
2218 buf[i] = '.';
2219 }
2220 buf[i] = 0;
2221 }
2222 }
2223
dn_state2asc(unsigned char state)2224 static char *dn_state2asc(unsigned char state)
2225 {
2226 switch (state) {
2227 case DN_O:
2228 return "OPEN";
2229 case DN_CR:
2230 return " CR";
2231 case DN_DR:
2232 return " DR";
2233 case DN_DRC:
2234 return " DRC";
2235 case DN_CC:
2236 return " CC";
2237 case DN_CI:
2238 return " CI";
2239 case DN_NR:
2240 return " NR";
2241 case DN_NC:
2242 return " NC";
2243 case DN_CD:
2244 return " CD";
2245 case DN_RJ:
2246 return " RJ";
2247 case DN_RUN:
2248 return " RUN";
2249 case DN_DI:
2250 return " DI";
2251 case DN_DIC:
2252 return " DIC";
2253 case DN_DN:
2254 return " DN";
2255 case DN_CL:
2256 return " CL";
2257 case DN_CN:
2258 return " CN";
2259 }
2260
2261 return "????";
2262 }
2263
dn_socket_format_entry(struct seq_file * seq,struct sock * sk)2264 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2265 {
2266 struct dn_scp *scp = DN_SK(sk);
2267 char buf1[DN_ASCBUF_LEN];
2268 char buf2[DN_ASCBUF_LEN];
2269 char local_object[DN_MAXOBJL+3];
2270 char remote_object[DN_MAXOBJL+3];
2271
2272 dn_printable_object(&scp->addr, local_object);
2273 dn_printable_object(&scp->peer, remote_object);
2274
2275 seq_printf(seq,
2276 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2277 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2278 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2279 scp->addrloc,
2280 scp->numdat,
2281 scp->numoth,
2282 scp->ackxmt_dat,
2283 scp->ackxmt_oth,
2284 scp->flowloc_sw,
2285 local_object,
2286 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2287 scp->addrrem,
2288 scp->numdat_rcv,
2289 scp->numoth_rcv,
2290 scp->ackrcv_dat,
2291 scp->ackrcv_oth,
2292 scp->flowrem_sw,
2293 remote_object,
2294 dn_state2asc(scp->state),
2295 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2296 }
2297
dn_socket_seq_show(struct seq_file * seq,void * v)2298 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2299 {
2300 if (v == SEQ_START_TOKEN) {
2301 seq_puts(seq, "Local Remote\n");
2302 } else {
2303 dn_socket_format_entry(seq, v);
2304 }
2305 return 0;
2306 }
2307
2308 static const struct seq_operations dn_socket_seq_ops = {
2309 .start = dn_socket_seq_start,
2310 .next = dn_socket_seq_next,
2311 .stop = dn_socket_seq_stop,
2312 .show = dn_socket_seq_show,
2313 };
2314
dn_socket_seq_open(struct inode * inode,struct file * file)2315 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2316 {
2317 return seq_open_private(file, &dn_socket_seq_ops,
2318 sizeof(struct dn_iter_state));
2319 }
2320
2321 static const struct file_operations dn_socket_seq_fops = {
2322 .owner = THIS_MODULE,
2323 .open = dn_socket_seq_open,
2324 .read = seq_read,
2325 .llseek = seq_lseek,
2326 .release = seq_release_private,
2327 };
2328 #endif
2329
2330 static const struct net_proto_family dn_family_ops = {
2331 .family = AF_DECnet,
2332 .create = dn_create,
2333 .owner = THIS_MODULE,
2334 };
2335
2336 static const struct proto_ops dn_proto_ops = {
2337 .family = AF_DECnet,
2338 .owner = THIS_MODULE,
2339 .release = dn_release,
2340 .bind = dn_bind,
2341 .connect = dn_connect,
2342 .socketpair = sock_no_socketpair,
2343 .accept = dn_accept,
2344 .getname = dn_getname,
2345 .poll = dn_poll,
2346 .ioctl = dn_ioctl,
2347 .listen = dn_listen,
2348 .shutdown = dn_shutdown,
2349 .setsockopt = dn_setsockopt,
2350 .getsockopt = dn_getsockopt,
2351 .sendmsg = dn_sendmsg,
2352 .recvmsg = dn_recvmsg,
2353 .mmap = sock_no_mmap,
2354 .sendpage = sock_no_sendpage,
2355 };
2356
2357 void dn_register_sysctl(void);
2358 void dn_unregister_sysctl(void);
2359
2360 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2361 MODULE_AUTHOR("Linux DECnet Project Team");
2362 MODULE_LICENSE("GPL");
2363 MODULE_ALIAS_NETPROTO(PF_DECnet);
2364
2365 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2366
decnet_init(void)2367 static int __init decnet_init(void)
2368 {
2369 int rc;
2370
2371 printk(banner);
2372
2373 rc = proto_register(&dn_proto, 1);
2374 if (rc != 0)
2375 goto out;
2376
2377 dn_neigh_init();
2378 dn_dev_init();
2379 dn_route_init();
2380 dn_fib_init();
2381
2382 sock_register(&dn_family_ops);
2383 dev_add_pack(&dn_dix_packet_type);
2384 register_netdevice_notifier(&dn_dev_notifier);
2385
2386 proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2387 dn_register_sysctl();
2388 out:
2389 return rc;
2390
2391 }
2392 module_init(decnet_init);
2393
2394 /*
2395 * Prevent DECnet module unloading until its fixed properly.
2396 * Requires an audit of the code to check for memory leaks and
2397 * initialisation problems etc.
2398 */
2399 #if 0
2400 static void __exit decnet_exit(void)
2401 {
2402 sock_unregister(AF_DECnet);
2403 rtnl_unregister_all(PF_DECnet);
2404 dev_remove_pack(&dn_dix_packet_type);
2405
2406 dn_unregister_sysctl();
2407
2408 unregister_netdevice_notifier(&dn_dev_notifier);
2409
2410 dn_route_cleanup();
2411 dn_dev_cleanup();
2412 dn_neigh_cleanup();
2413 dn_fib_cleanup();
2414
2415 proc_net_remove(&init_net, "decnet");
2416
2417 proto_unregister(&dn_proto);
2418
2419 rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2420 }
2421 module_exit(decnet_exit);
2422 #endif
2423