1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 /*
4 * DECnet An implementation of the DECnet protocol suite for the LINUX
5 * operating system. DECnet is implemented using the BSD Socket
6 * interface as the means of communication with the user level.
7 *
8 * DECnet Socket Layer Interface
9 *
10 * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
11 * Patrick Caulfield <patrick@pandh.demon.co.uk>
12 *
13 * Changes:
14 * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
15 * version of the code. Original copyright preserved
16 * below.
17 * Steve Whitehouse: Some bug fixes, cleaning up some code to make it
18 * compatible with my routing layer.
19 * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
20 * Caulfield.
21 * Steve Whitehouse: Further bug fixes, checking module code still works
22 * with new routing layer.
23 * Steve Whitehouse: Additional set/get_sockopt() calls.
24 * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
25 * code.
26 * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
27 * way. Didn't manage it entirely, but its better.
28 * Steve Whitehouse: ditto for sendmsg().
29 * Steve Whitehouse: A selection of bug fixes to various things.
30 * Steve Whitehouse: Added TIOCOUTQ ioctl.
31 * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
32 * Steve Whitehouse: Fixes to connect() error returns.
33 * Patrick Caulfield: Fixes to delayed acceptance logic.
34 * David S. Miller: New socket locking
35 * Steve Whitehouse: Socket list hashing/locking
36 * Arnaldo C. Melo: use capable, not suser
37 * Steve Whitehouse: Removed unused code. Fix to use sk->allocation
38 * when required.
39 * Patrick Caulfield: /proc/net/decnet now has object name/number
40 * Steve Whitehouse: Fixed local port allocation, hashed sk list
41 * Matthew Wilcox: Fixes for dn_ioctl()
42 * Steve Whitehouse: New connect/accept logic to allow timeouts and
43 * prepare for sendpage etc.
44 */
45
46
47 /******************************************************************************
48 (c) 1995-1998 E.M. Serrat emserrat@geocities.com
49
50
51 HISTORY:
52
53 Version Kernel Date Author/Comments
54 ------- ------ ---- ---------------
55 Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
56 (emserrat@geocities.com)
57
58 First Development of DECnet Socket La-
59 yer for Linux. Only supports outgoing
60 connections.
61
62 Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
63 (patrick@pandh.demon.co.uk)
64
65 Port to new kernel development version.
66
67 Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
68 (emserrat@geocities.com)
69 _
70 Added support for incoming connections
71 so we can start developing server apps
72 on Linux.
73 -
74 Module Support
75 Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
76 (emserrat@geocities.com)
77 _
78 Added support for X11R6.4. Now we can
79 use DECnet transport for X on Linux!!!
80 -
81 Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
82 (emserrat@geocities.com)
83 Removed bugs on flow control
84 Removed bugs on incoming accessdata
85 order
86 -
87 Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
88 dn_recvmsg fixes
89
90 Patrick J. Caulfield
91 dn_bind fixes
92 *******************************************************************************/
93
94 #include <linux/module.h>
95 #include <linux/errno.h>
96 #include <linux/types.h>
97 #include <linux/slab.h>
98 #include <linux/socket.h>
99 #include <linux/in.h>
100 #include <linux/kernel.h>
101 #include <linux/sched/signal.h>
102 #include <linux/timer.h>
103 #include <linux/string.h>
104 #include <linux/sockios.h>
105 #include <linux/net.h>
106 #include <linux/netdevice.h>
107 #include <linux/inet.h>
108 #include <linux/route.h>
109 #include <linux/netfilter.h>
110 #include <linux/seq_file.h>
111 #include <net/sock.h>
112 #include <net/tcp_states.h>
113 #include <net/flow.h>
114 #include <asm/ioctls.h>
115 #include <linux/capability.h>
116 #include <linux/mm.h>
117 #include <linux/interrupt.h>
118 #include <linux/proc_fs.h>
119 #include <linux/stat.h>
120 #include <linux/init.h>
121 #include <linux/poll.h>
122 #include <linux/jiffies.h>
123 #include <net/net_namespace.h>
124 #include <net/neighbour.h>
125 #include <net/dst.h>
126 #include <net/fib_rules.h>
127 #include <net/tcp.h>
128 #include <net/dn.h>
129 #include <net/dn_nsp.h>
130 #include <net/dn_dev.h>
131 #include <net/dn_route.h>
132 #include <net/dn_fib.h>
133 #include <net/dn_neigh.h>
134
135 struct dn_sock {
136 struct sock sk;
137 struct dn_scp scp;
138 };
139
140 static void dn_keepalive(struct sock *sk);
141
142 #define DN_SK_HASH_SHIFT 8
143 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
144 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
145
146
147 static const struct proto_ops dn_proto_ops;
148 static DEFINE_RWLOCK(dn_hash_lock);
149 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
150 static struct hlist_head dn_wild_sk;
151 static atomic_long_t decnet_memory_allocated;
152
153 static int __dn_setsockopt(struct socket *sock, int level, int optname,
154 sockptr_t optval, unsigned int optlen, int flags);
155 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
156
dn_find_list(struct sock * sk)157 static struct hlist_head *dn_find_list(struct sock *sk)
158 {
159 struct dn_scp *scp = DN_SK(sk);
160
161 if (scp->addr.sdn_flags & SDF_WILD)
162 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
163
164 return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
165 }
166
167 /*
168 * Valid ports are those greater than zero and not already in use.
169 */
check_port(__le16 port)170 static int check_port(__le16 port)
171 {
172 struct sock *sk;
173
174 if (port == 0)
175 return -1;
176
177 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
178 struct dn_scp *scp = DN_SK(sk);
179 if (scp->addrloc == port)
180 return -1;
181 }
182 return 0;
183 }
184
port_alloc(struct sock * sk)185 static unsigned short port_alloc(struct sock *sk)
186 {
187 struct dn_scp *scp = DN_SK(sk);
188 static unsigned short port = 0x2000;
189 unsigned short i_port = port;
190
191 while(check_port(cpu_to_le16(++port)) != 0) {
192 if (port == i_port)
193 return 0;
194 }
195
196 scp->addrloc = cpu_to_le16(port);
197
198 return 1;
199 }
200
201 /*
202 * Since this is only ever called from user
203 * level, we don't need a write_lock() version
204 * of this.
205 */
dn_hash_sock(struct sock * sk)206 static int dn_hash_sock(struct sock *sk)
207 {
208 struct dn_scp *scp = DN_SK(sk);
209 struct hlist_head *list;
210 int rv = -EUSERS;
211
212 BUG_ON(sk_hashed(sk));
213
214 write_lock_bh(&dn_hash_lock);
215
216 if (!scp->addrloc && !port_alloc(sk))
217 goto out;
218
219 rv = -EADDRINUSE;
220 if ((list = dn_find_list(sk)) == NULL)
221 goto out;
222
223 sk_add_node(sk, list);
224 rv = 0;
225 out:
226 write_unlock_bh(&dn_hash_lock);
227 return rv;
228 }
229
dn_unhash_sock(struct sock * sk)230 static void dn_unhash_sock(struct sock *sk)
231 {
232 write_lock(&dn_hash_lock);
233 sk_del_node_init(sk);
234 write_unlock(&dn_hash_lock);
235 }
236
dn_unhash_sock_bh(struct sock * sk)237 static void dn_unhash_sock_bh(struct sock *sk)
238 {
239 write_lock_bh(&dn_hash_lock);
240 sk_del_node_init(sk);
241 write_unlock_bh(&dn_hash_lock);
242 }
243
listen_hash(struct sockaddr_dn * addr)244 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
245 {
246 int i;
247 unsigned int hash = addr->sdn_objnum;
248
249 if (hash == 0) {
250 hash = addr->sdn_objnamel;
251 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
252 hash ^= addr->sdn_objname[i];
253 hash ^= (hash << 3);
254 }
255 }
256
257 return &dn_sk_hash[hash & DN_SK_HASH_MASK];
258 }
259
260 /*
261 * Called to transform a socket from bound (i.e. with a local address)
262 * into a listening socket (doesn't need a local port number) and rehashes
263 * based upon the object name/number.
264 */
dn_rehash_sock(struct sock * sk)265 static void dn_rehash_sock(struct sock *sk)
266 {
267 struct hlist_head *list;
268 struct dn_scp *scp = DN_SK(sk);
269
270 if (scp->addr.sdn_flags & SDF_WILD)
271 return;
272
273 write_lock_bh(&dn_hash_lock);
274 sk_del_node_init(sk);
275 DN_SK(sk)->addrloc = 0;
276 list = listen_hash(&DN_SK(sk)->addr);
277 sk_add_node(sk, list);
278 write_unlock_bh(&dn_hash_lock);
279 }
280
dn_sockaddr2username(struct sockaddr_dn * sdn,unsigned char * buf,unsigned char type)281 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
282 {
283 int len = 2;
284
285 *buf++ = type;
286
287 switch (type) {
288 case 0:
289 *buf++ = sdn->sdn_objnum;
290 break;
291 case 1:
292 *buf++ = 0;
293 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
294 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
295 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
296 break;
297 case 2:
298 memset(buf, 0, 5);
299 buf += 5;
300 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
301 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
302 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
303 break;
304 }
305
306 return len;
307 }
308
309 /*
310 * On reception of usernames, we handle types 1 and 0 for destination
311 * addresses only. Types 2 and 4 are used for source addresses, but the
312 * UIC, GIC are ignored and they are both treated the same way. Type 3
313 * is never used as I've no idea what its purpose might be or what its
314 * format is.
315 */
dn_username2sockaddr(unsigned char * data,int len,struct sockaddr_dn * sdn,unsigned char * fmt)316 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
317 {
318 unsigned char type;
319 int size = len;
320 int namel = 12;
321
322 sdn->sdn_objnum = 0;
323 sdn->sdn_objnamel = cpu_to_le16(0);
324 memset(sdn->sdn_objname, 0, DN_MAXOBJL);
325
326 if (len < 2)
327 return -1;
328
329 len -= 2;
330 *fmt = *data++;
331 type = *data++;
332
333 switch (*fmt) {
334 case 0:
335 sdn->sdn_objnum = type;
336 return 2;
337 case 1:
338 namel = 16;
339 break;
340 case 2:
341 len -= 4;
342 data += 4;
343 break;
344 case 4:
345 len -= 8;
346 data += 8;
347 break;
348 default:
349 return -1;
350 }
351
352 len -= 1;
353
354 if (len < 0)
355 return -1;
356
357 sdn->sdn_objnamel = cpu_to_le16(*data++);
358 len -= le16_to_cpu(sdn->sdn_objnamel);
359
360 if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
361 return -1;
362
363 memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
364
365 return size - len;
366 }
367
dn_sklist_find_listener(struct sockaddr_dn * addr)368 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
369 {
370 struct hlist_head *list = listen_hash(addr);
371 struct sock *sk;
372
373 read_lock(&dn_hash_lock);
374 sk_for_each(sk, list) {
375 struct dn_scp *scp = DN_SK(sk);
376 if (sk->sk_state != TCP_LISTEN)
377 continue;
378 if (scp->addr.sdn_objnum) {
379 if (scp->addr.sdn_objnum != addr->sdn_objnum)
380 continue;
381 } else {
382 if (addr->sdn_objnum)
383 continue;
384 if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
385 continue;
386 if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
387 continue;
388 }
389 sock_hold(sk);
390 read_unlock(&dn_hash_lock);
391 return sk;
392 }
393
394 sk = sk_head(&dn_wild_sk);
395 if (sk) {
396 if (sk->sk_state == TCP_LISTEN)
397 sock_hold(sk);
398 else
399 sk = NULL;
400 }
401
402 read_unlock(&dn_hash_lock);
403 return sk;
404 }
405
dn_find_by_skb(struct sk_buff * skb)406 struct sock *dn_find_by_skb(struct sk_buff *skb)
407 {
408 struct dn_skb_cb *cb = DN_SKB_CB(skb);
409 struct sock *sk;
410 struct dn_scp *scp;
411
412 read_lock(&dn_hash_lock);
413 sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
414 scp = DN_SK(sk);
415 if (cb->src != dn_saddr2dn(&scp->peer))
416 continue;
417 if (cb->dst_port != scp->addrloc)
418 continue;
419 if (scp->addrrem && (cb->src_port != scp->addrrem))
420 continue;
421 sock_hold(sk);
422 goto found;
423 }
424 sk = NULL;
425 found:
426 read_unlock(&dn_hash_lock);
427 return sk;
428 }
429
430
431
dn_destruct(struct sock * sk)432 static void dn_destruct(struct sock *sk)
433 {
434 struct dn_scp *scp = DN_SK(sk);
435
436 skb_queue_purge(&scp->data_xmit_queue);
437 skb_queue_purge(&scp->other_xmit_queue);
438 skb_queue_purge(&scp->other_receive_queue);
439
440 dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
441 }
442
443 static unsigned long dn_memory_pressure;
444
dn_enter_memory_pressure(struct sock * sk)445 static void dn_enter_memory_pressure(struct sock *sk)
446 {
447 if (!dn_memory_pressure) {
448 dn_memory_pressure = 1;
449 }
450 }
451
452 static struct proto dn_proto = {
453 .name = "NSP",
454 .owner = THIS_MODULE,
455 .enter_memory_pressure = dn_enter_memory_pressure,
456 .memory_pressure = &dn_memory_pressure,
457 .memory_allocated = &decnet_memory_allocated,
458 .sysctl_mem = sysctl_decnet_mem,
459 .sysctl_wmem = sysctl_decnet_wmem,
460 .sysctl_rmem = sysctl_decnet_rmem,
461 .max_header = DN_MAX_NSP_DATA_HEADER + 64,
462 .obj_size = sizeof(struct dn_sock),
463 };
464
dn_alloc_sock(struct net * net,struct socket * sock,gfp_t gfp,int kern)465 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
466 {
467 struct dn_scp *scp;
468 struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
469
470 if (!sk)
471 goto out;
472
473 if (sock)
474 sock->ops = &dn_proto_ops;
475 sock_init_data(sock, sk);
476
477 sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
478 sk->sk_destruct = dn_destruct;
479 sk->sk_no_check_tx = 1;
480 sk->sk_family = PF_DECnet;
481 sk->sk_protocol = 0;
482 sk->sk_allocation = gfp;
483 sk->sk_sndbuf = sysctl_decnet_wmem[1];
484 sk->sk_rcvbuf = sysctl_decnet_rmem[1];
485
486 /* Initialization of DECnet Session Control Port */
487 scp = DN_SK(sk);
488 scp->state = DN_O; /* Open */
489 scp->numdat = 1; /* Next data seg to tx */
490 scp->numoth = 1; /* Next oth data to tx */
491 scp->ackxmt_dat = 0; /* Last data seg ack'ed */
492 scp->ackxmt_oth = 0; /* Last oth data ack'ed */
493 scp->ackrcv_dat = 0; /* Highest data ack recv*/
494 scp->ackrcv_oth = 0; /* Last oth data ack rec*/
495 scp->flowrem_sw = DN_SEND;
496 scp->flowloc_sw = DN_SEND;
497 scp->flowrem_dat = 0;
498 scp->flowrem_oth = 1;
499 scp->flowloc_dat = 0;
500 scp->flowloc_oth = 1;
501 scp->services_rem = 0;
502 scp->services_loc = 1 | NSP_FC_NONE;
503 scp->info_rem = 0;
504 scp->info_loc = 0x03; /* NSP version 4.1 */
505 scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
506 scp->nonagle = 0;
507 scp->multi_ireq = 1;
508 scp->accept_mode = ACC_IMMED;
509 scp->addr.sdn_family = AF_DECnet;
510 scp->peer.sdn_family = AF_DECnet;
511 scp->accessdata.acc_accl = 5;
512 memcpy(scp->accessdata.acc_acc, "LINUX", 5);
513
514 scp->max_window = NSP_MAX_WINDOW;
515 scp->snd_window = NSP_MIN_WINDOW;
516 scp->nsp_srtt = NSP_INITIAL_SRTT;
517 scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
518 scp->nsp_rxtshift = 0;
519
520 skb_queue_head_init(&scp->data_xmit_queue);
521 skb_queue_head_init(&scp->other_xmit_queue);
522 skb_queue_head_init(&scp->other_receive_queue);
523
524 scp->persist = 0;
525 scp->persist_fxn = NULL;
526 scp->keepalive = 10 * HZ;
527 scp->keepalive_fxn = dn_keepalive;
528
529 dn_start_slow_timer(sk);
530 out:
531 return sk;
532 }
533
534 /*
535 * Keepalive timer.
536 * FIXME: Should respond to SO_KEEPALIVE etc.
537 */
dn_keepalive(struct sock * sk)538 static void dn_keepalive(struct sock *sk)
539 {
540 struct dn_scp *scp = DN_SK(sk);
541
542 /*
543 * By checking the other_data transmit queue is empty
544 * we are double checking that we are not sending too
545 * many of these keepalive frames.
546 */
547 if (skb_queue_empty(&scp->other_xmit_queue))
548 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
549 }
550
551
552 /*
553 * Timer for shutdown/destroyed sockets.
554 * When socket is dead & no packets have been sent for a
555 * certain amount of time, they are removed by this
556 * routine. Also takes care of sending out DI & DC
557 * frames at correct times.
558 */
dn_destroy_timer(struct sock * sk)559 int dn_destroy_timer(struct sock *sk)
560 {
561 struct dn_scp *scp = DN_SK(sk);
562
563 scp->persist = dn_nsp_persist(sk);
564
565 switch (scp->state) {
566 case DN_DI:
567 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
568 if (scp->nsp_rxtshift >= decnet_di_count)
569 scp->state = DN_CN;
570 return 0;
571
572 case DN_DR:
573 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
574 if (scp->nsp_rxtshift >= decnet_dr_count)
575 scp->state = DN_DRC;
576 return 0;
577
578 case DN_DN:
579 if (scp->nsp_rxtshift < decnet_dn_count) {
580 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
581 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
582 GFP_ATOMIC);
583 return 0;
584 }
585 }
586
587 scp->persist = (HZ * decnet_time_wait);
588
589 if (sk->sk_socket)
590 return 0;
591
592 if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
593 dn_unhash_sock(sk);
594 sock_put(sk);
595 return 1;
596 }
597
598 return 0;
599 }
600
dn_destroy_sock(struct sock * sk)601 static void dn_destroy_sock(struct sock *sk)
602 {
603 struct dn_scp *scp = DN_SK(sk);
604
605 scp->nsp_rxtshift = 0; /* reset back off */
606
607 if (sk->sk_socket) {
608 if (sk->sk_socket->state != SS_UNCONNECTED)
609 sk->sk_socket->state = SS_DISCONNECTING;
610 }
611
612 sk->sk_state = TCP_CLOSE;
613
614 switch (scp->state) {
615 case DN_DN:
616 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
617 sk->sk_allocation);
618 scp->persist_fxn = dn_destroy_timer;
619 scp->persist = dn_nsp_persist(sk);
620 break;
621 case DN_CR:
622 scp->state = DN_DR;
623 goto disc_reject;
624 case DN_RUN:
625 scp->state = DN_DI;
626 fallthrough;
627 case DN_DI:
628 case DN_DR:
629 disc_reject:
630 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
631 fallthrough;
632 case DN_NC:
633 case DN_NR:
634 case DN_RJ:
635 case DN_DIC:
636 case DN_CN:
637 case DN_DRC:
638 case DN_CI:
639 case DN_CD:
640 scp->persist_fxn = dn_destroy_timer;
641 scp->persist = dn_nsp_persist(sk);
642 break;
643 default:
644 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
645 fallthrough;
646 case DN_O:
647 dn_stop_slow_timer(sk);
648
649 dn_unhash_sock_bh(sk);
650 sock_put(sk);
651
652 break;
653 }
654 }
655
dn_addr2asc(__u16 addr,char * buf)656 char *dn_addr2asc(__u16 addr, char *buf)
657 {
658 unsigned short node, area;
659
660 node = addr & 0x03ff;
661 area = addr >> 10;
662 sprintf(buf, "%hd.%hd", area, node);
663
664 return buf;
665 }
666
667
668
dn_create(struct net * net,struct socket * sock,int protocol,int kern)669 static int dn_create(struct net *net, struct socket *sock, int protocol,
670 int kern)
671 {
672 struct sock *sk;
673
674 if (protocol < 0 || protocol > U8_MAX)
675 return -EINVAL;
676
677 if (!net_eq(net, &init_net))
678 return -EAFNOSUPPORT;
679
680 switch (sock->type) {
681 case SOCK_SEQPACKET:
682 if (protocol != DNPROTO_NSP)
683 return -EPROTONOSUPPORT;
684 break;
685 case SOCK_STREAM:
686 break;
687 default:
688 return -ESOCKTNOSUPPORT;
689 }
690
691
692 if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
693 return -ENOBUFS;
694
695 sk->sk_protocol = protocol;
696
697 return 0;
698 }
699
700
701 static int
dn_release(struct socket * sock)702 dn_release(struct socket *sock)
703 {
704 struct sock *sk = sock->sk;
705
706 if (sk) {
707 sock_orphan(sk);
708 sock_hold(sk);
709 lock_sock(sk);
710 dn_destroy_sock(sk);
711 release_sock(sk);
712 sock_put(sk);
713 }
714
715 return 0;
716 }
717
dn_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)718 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
719 {
720 struct sock *sk = sock->sk;
721 struct dn_scp *scp = DN_SK(sk);
722 struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
723 struct net_device *dev, *ldev;
724 int rv;
725
726 if (addr_len != sizeof(struct sockaddr_dn))
727 return -EINVAL;
728
729 if (saddr->sdn_family != AF_DECnet)
730 return -EINVAL;
731
732 if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
733 return -EINVAL;
734
735 if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
736 return -EINVAL;
737
738 if (saddr->sdn_flags & ~SDF_WILD)
739 return -EINVAL;
740
741 if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
742 (saddr->sdn_flags & SDF_WILD)))
743 return -EACCES;
744
745 if (!(saddr->sdn_flags & SDF_WILD)) {
746 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
747 rcu_read_lock();
748 ldev = NULL;
749 for_each_netdev_rcu(&init_net, dev) {
750 if (!dev->dn_ptr)
751 continue;
752 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
753 ldev = dev;
754 break;
755 }
756 }
757 rcu_read_unlock();
758 if (ldev == NULL)
759 return -EADDRNOTAVAIL;
760 }
761 }
762
763 rv = -EINVAL;
764 lock_sock(sk);
765 if (sock_flag(sk, SOCK_ZAPPED)) {
766 memcpy(&scp->addr, saddr, addr_len);
767 sock_reset_flag(sk, SOCK_ZAPPED);
768
769 rv = dn_hash_sock(sk);
770 if (rv)
771 sock_set_flag(sk, SOCK_ZAPPED);
772 }
773 release_sock(sk);
774
775 return rv;
776 }
777
778
dn_auto_bind(struct socket * sock)779 static int dn_auto_bind(struct socket *sock)
780 {
781 struct sock *sk = sock->sk;
782 struct dn_scp *scp = DN_SK(sk);
783 int rv;
784
785 sock_reset_flag(sk, SOCK_ZAPPED);
786
787 scp->addr.sdn_flags = 0;
788 scp->addr.sdn_objnum = 0;
789
790 /*
791 * This stuff is to keep compatibility with Eduardo's
792 * patch. I hope I can dispense with it shortly...
793 */
794 if ((scp->accessdata.acc_accl != 0) &&
795 (scp->accessdata.acc_accl <= 12)) {
796
797 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
798 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
799
800 scp->accessdata.acc_accl = 0;
801 memset(scp->accessdata.acc_acc, 0, 40);
802 }
803 /* End of compatibility stuff */
804
805 scp->addr.sdn_add.a_len = cpu_to_le16(2);
806 rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
807 if (rv == 0) {
808 rv = dn_hash_sock(sk);
809 if (rv)
810 sock_set_flag(sk, SOCK_ZAPPED);
811 }
812
813 return rv;
814 }
815
dn_confirm_accept(struct sock * sk,long * timeo,gfp_t allocation)816 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
817 {
818 struct dn_scp *scp = DN_SK(sk);
819 DEFINE_WAIT_FUNC(wait, woken_wake_function);
820 int err;
821
822 if (scp->state != DN_CR)
823 return -EINVAL;
824
825 scp->state = DN_CC;
826 scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
827 dn_send_conn_conf(sk, allocation);
828
829 add_wait_queue(sk_sleep(sk), &wait);
830 for(;;) {
831 release_sock(sk);
832 if (scp->state == DN_CC)
833 *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
834 lock_sock(sk);
835 err = 0;
836 if (scp->state == DN_RUN)
837 break;
838 err = sock_error(sk);
839 if (err)
840 break;
841 err = sock_intr_errno(*timeo);
842 if (signal_pending(current))
843 break;
844 err = -EAGAIN;
845 if (!*timeo)
846 break;
847 }
848 remove_wait_queue(sk_sleep(sk), &wait);
849 if (err == 0) {
850 sk->sk_socket->state = SS_CONNECTED;
851 } else if (scp->state != DN_CC) {
852 sk->sk_socket->state = SS_UNCONNECTED;
853 }
854 return err;
855 }
856
dn_wait_run(struct sock * sk,long * timeo)857 static int dn_wait_run(struct sock *sk, long *timeo)
858 {
859 struct dn_scp *scp = DN_SK(sk);
860 DEFINE_WAIT_FUNC(wait, woken_wake_function);
861 int err = 0;
862
863 if (scp->state == DN_RUN)
864 goto out;
865
866 if (!*timeo)
867 return -EALREADY;
868
869 add_wait_queue(sk_sleep(sk), &wait);
870 for(;;) {
871 release_sock(sk);
872 if (scp->state == DN_CI || scp->state == DN_CC)
873 *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
874 lock_sock(sk);
875 err = 0;
876 if (scp->state == DN_RUN)
877 break;
878 err = sock_error(sk);
879 if (err)
880 break;
881 err = sock_intr_errno(*timeo);
882 if (signal_pending(current))
883 break;
884 err = -ETIMEDOUT;
885 if (!*timeo)
886 break;
887 }
888 remove_wait_queue(sk_sleep(sk), &wait);
889 out:
890 if (err == 0) {
891 sk->sk_socket->state = SS_CONNECTED;
892 } else if (scp->state != DN_CI && scp->state != DN_CC) {
893 sk->sk_socket->state = SS_UNCONNECTED;
894 }
895 return err;
896 }
897
__dn_connect(struct sock * sk,struct sockaddr_dn * addr,int addrlen,long * timeo,int flags)898 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
899 {
900 struct socket *sock = sk->sk_socket;
901 struct dn_scp *scp = DN_SK(sk);
902 int err = -EISCONN;
903 struct flowidn fld;
904 struct dst_entry *dst;
905
906 if (sock->state == SS_CONNECTED)
907 goto out;
908
909 if (sock->state == SS_CONNECTING) {
910 err = 0;
911 if (scp->state == DN_RUN) {
912 sock->state = SS_CONNECTED;
913 goto out;
914 }
915 err = -ECONNREFUSED;
916 if (scp->state != DN_CI && scp->state != DN_CC) {
917 sock->state = SS_UNCONNECTED;
918 goto out;
919 }
920 return dn_wait_run(sk, timeo);
921 }
922
923 err = -EINVAL;
924 if (scp->state != DN_O)
925 goto out;
926
927 if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
928 goto out;
929 if (addr->sdn_family != AF_DECnet)
930 goto out;
931 if (addr->sdn_flags & SDF_WILD)
932 goto out;
933
934 if (sock_flag(sk, SOCK_ZAPPED)) {
935 err = dn_auto_bind(sk->sk_socket);
936 if (err)
937 goto out;
938 }
939
940 memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
941
942 err = -EHOSTUNREACH;
943 memset(&fld, 0, sizeof(fld));
944 fld.flowidn_oif = sk->sk_bound_dev_if;
945 fld.daddr = dn_saddr2dn(&scp->peer);
946 fld.saddr = dn_saddr2dn(&scp->addr);
947 dn_sk_ports_copy(&fld, scp);
948 fld.flowidn_proto = DNPROTO_NSP;
949 if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
950 goto out;
951 dst = __sk_dst_get(sk);
952 sk->sk_route_caps = dst->dev->features;
953 sock->state = SS_CONNECTING;
954 scp->state = DN_CI;
955 scp->segsize_loc = dst_metric_advmss(dst);
956
957 dn_nsp_send_conninit(sk, NSP_CI);
958 err = -EINPROGRESS;
959 if (*timeo) {
960 err = dn_wait_run(sk, timeo);
961 }
962 out:
963 return err;
964 }
965
dn_connect(struct socket * sock,struct sockaddr * uaddr,int addrlen,int flags)966 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
967 {
968 struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
969 struct sock *sk = sock->sk;
970 int err;
971 long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
972
973 lock_sock(sk);
974 err = __dn_connect(sk, addr, addrlen, &timeo, 0);
975 release_sock(sk);
976
977 return err;
978 }
979
dn_check_state(struct sock * sk,struct sockaddr_dn * addr,int addrlen,long * timeo,int flags)980 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
981 {
982 struct dn_scp *scp = DN_SK(sk);
983
984 switch (scp->state) {
985 case DN_RUN:
986 return 0;
987 case DN_CR:
988 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
989 case DN_CI:
990 case DN_CC:
991 return dn_wait_run(sk, timeo);
992 case DN_O:
993 return __dn_connect(sk, addr, addrlen, timeo, flags);
994 }
995
996 return -EINVAL;
997 }
998
999
dn_access_copy(struct sk_buff * skb,struct accessdata_dn * acc)1000 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1001 {
1002 unsigned char *ptr = skb->data;
1003
1004 acc->acc_userl = *ptr++;
1005 memcpy(&acc->acc_user, ptr, acc->acc_userl);
1006 ptr += acc->acc_userl;
1007
1008 acc->acc_passl = *ptr++;
1009 memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1010 ptr += acc->acc_passl;
1011
1012 acc->acc_accl = *ptr++;
1013 memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1014
1015 skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1016
1017 }
1018
dn_user_copy(struct sk_buff * skb,struct optdata_dn * opt)1019 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1020 {
1021 unsigned char *ptr = skb->data;
1022 u16 len = *ptr++; /* yes, it's 8bit on the wire */
1023
1024 BUG_ON(len > 16); /* we've checked the contents earlier */
1025 opt->opt_optl = cpu_to_le16(len);
1026 opt->opt_status = 0;
1027 memcpy(opt->opt_data, ptr, len);
1028 skb_pull(skb, len + 1);
1029 }
1030
dn_wait_for_connect(struct sock * sk,long * timeo)1031 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1032 {
1033 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1034 struct sk_buff *skb = NULL;
1035 int err = 0;
1036
1037 add_wait_queue(sk_sleep(sk), &wait);
1038 for(;;) {
1039 release_sock(sk);
1040 skb = skb_dequeue(&sk->sk_receive_queue);
1041 if (skb == NULL) {
1042 *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
1043 skb = skb_dequeue(&sk->sk_receive_queue);
1044 }
1045 lock_sock(sk);
1046 if (skb != NULL)
1047 break;
1048 err = -EINVAL;
1049 if (sk->sk_state != TCP_LISTEN)
1050 break;
1051 err = sock_intr_errno(*timeo);
1052 if (signal_pending(current))
1053 break;
1054 err = -EAGAIN;
1055 if (!*timeo)
1056 break;
1057 }
1058 remove_wait_queue(sk_sleep(sk), &wait);
1059
1060 return skb == NULL ? ERR_PTR(err) : skb;
1061 }
1062
dn_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)1063 static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
1064 bool kern)
1065 {
1066 struct sock *sk = sock->sk, *newsk;
1067 struct sk_buff *skb = NULL;
1068 struct dn_skb_cb *cb;
1069 unsigned char menuver;
1070 int err = 0;
1071 unsigned char type;
1072 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1073 struct dst_entry *dst;
1074
1075 lock_sock(sk);
1076
1077 if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1078 release_sock(sk);
1079 return -EINVAL;
1080 }
1081
1082 skb = skb_dequeue(&sk->sk_receive_queue);
1083 if (skb == NULL) {
1084 skb = dn_wait_for_connect(sk, &timeo);
1085 if (IS_ERR(skb)) {
1086 release_sock(sk);
1087 return PTR_ERR(skb);
1088 }
1089 }
1090
1091 cb = DN_SKB_CB(skb);
1092 sk_acceptq_removed(sk);
1093 newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1094 if (newsk == NULL) {
1095 release_sock(sk);
1096 kfree_skb(skb);
1097 return -ENOBUFS;
1098 }
1099 release_sock(sk);
1100
1101 dst = skb_dst(skb);
1102 sk_dst_set(newsk, dst);
1103 skb_dst_set(skb, NULL);
1104
1105 DN_SK(newsk)->state = DN_CR;
1106 DN_SK(newsk)->addrrem = cb->src_port;
1107 DN_SK(newsk)->services_rem = cb->services;
1108 DN_SK(newsk)->info_rem = cb->info;
1109 DN_SK(newsk)->segsize_rem = cb->segsize;
1110 DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
1111
1112 if (DN_SK(newsk)->segsize_rem < 230)
1113 DN_SK(newsk)->segsize_rem = 230;
1114
1115 if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1116 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1117
1118 newsk->sk_state = TCP_LISTEN;
1119 memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1120
1121 /*
1122 * If we are listening on a wild socket, we don't want
1123 * the newly created socket on the wrong hash queue.
1124 */
1125 DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1126
1127 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1128 skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1129 *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1130 *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1131
1132 menuver = *skb->data;
1133 skb_pull(skb, 1);
1134
1135 if (menuver & DN_MENUVER_ACC)
1136 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1137
1138 if (menuver & DN_MENUVER_USR)
1139 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1140
1141 if (menuver & DN_MENUVER_PRX)
1142 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1143
1144 if (menuver & DN_MENUVER_UIC)
1145 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1146
1147 kfree_skb(skb);
1148
1149 memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1150 sizeof(struct optdata_dn));
1151 memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1152 sizeof(struct optdata_dn));
1153
1154 lock_sock(newsk);
1155 err = dn_hash_sock(newsk);
1156 if (err == 0) {
1157 sock_reset_flag(newsk, SOCK_ZAPPED);
1158 dn_send_conn_ack(newsk);
1159
1160 /*
1161 * Here we use sk->sk_allocation since although the conn conf is
1162 * for the newsk, the context is the old socket.
1163 */
1164 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1165 err = dn_confirm_accept(newsk, &timeo,
1166 sk->sk_allocation);
1167 }
1168 release_sock(newsk);
1169 return err;
1170 }
1171
1172
dn_getname(struct socket * sock,struct sockaddr * uaddr,int peer)1173 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int peer)
1174 {
1175 struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1176 struct sock *sk = sock->sk;
1177 struct dn_scp *scp = DN_SK(sk);
1178
1179 lock_sock(sk);
1180
1181 if (peer) {
1182 if ((sock->state != SS_CONNECTED &&
1183 sock->state != SS_CONNECTING) &&
1184 scp->accept_mode == ACC_IMMED) {
1185 release_sock(sk);
1186 return -ENOTCONN;
1187 }
1188
1189 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1190 } else {
1191 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1192 }
1193
1194 release_sock(sk);
1195
1196 return sizeof(struct sockaddr_dn);
1197 }
1198
1199
dn_poll(struct file * file,struct socket * sock,poll_table * wait)1200 static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table *wait)
1201 {
1202 struct sock *sk = sock->sk;
1203 struct dn_scp *scp = DN_SK(sk);
1204 __poll_t mask = datagram_poll(file, sock, wait);
1205
1206 if (!skb_queue_empty_lockless(&scp->other_receive_queue))
1207 mask |= EPOLLRDBAND;
1208
1209 return mask;
1210 }
1211
dn_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1212 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1213 {
1214 struct sock *sk = sock->sk;
1215 struct dn_scp *scp = DN_SK(sk);
1216 int err = -EOPNOTSUPP;
1217 long amount = 0;
1218 struct sk_buff *skb;
1219 int val;
1220
1221 switch(cmd)
1222 {
1223 case SIOCGIFADDR:
1224 case SIOCSIFADDR:
1225 return dn_dev_ioctl(cmd, (void __user *)arg);
1226
1227 case SIOCATMARK:
1228 lock_sock(sk);
1229 val = !skb_queue_empty(&scp->other_receive_queue);
1230 if (scp->state != DN_RUN)
1231 val = -ENOTCONN;
1232 release_sock(sk);
1233 return val;
1234
1235 case TIOCOUTQ:
1236 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1237 if (amount < 0)
1238 amount = 0;
1239 err = put_user(amount, (int __user *)arg);
1240 break;
1241
1242 case TIOCINQ:
1243 lock_sock(sk);
1244 skb = skb_peek(&scp->other_receive_queue);
1245 if (skb) {
1246 amount = skb->len;
1247 } else {
1248 skb_queue_walk(&sk->sk_receive_queue, skb)
1249 amount += skb->len;
1250 }
1251 release_sock(sk);
1252 err = put_user(amount, (int __user *)arg);
1253 break;
1254
1255 default:
1256 err = -ENOIOCTLCMD;
1257 break;
1258 }
1259
1260 return err;
1261 }
1262
dn_listen(struct socket * sock,int backlog)1263 static int dn_listen(struct socket *sock, int backlog)
1264 {
1265 struct sock *sk = sock->sk;
1266 int err = -EINVAL;
1267
1268 lock_sock(sk);
1269
1270 if (sock_flag(sk, SOCK_ZAPPED))
1271 goto out;
1272
1273 if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1274 goto out;
1275
1276 sk->sk_max_ack_backlog = backlog;
1277 sk->sk_ack_backlog = 0;
1278 sk->sk_state = TCP_LISTEN;
1279 err = 0;
1280 dn_rehash_sock(sk);
1281
1282 out:
1283 release_sock(sk);
1284
1285 return err;
1286 }
1287
1288
dn_shutdown(struct socket * sock,int how)1289 static int dn_shutdown(struct socket *sock, int how)
1290 {
1291 struct sock *sk = sock->sk;
1292 struct dn_scp *scp = DN_SK(sk);
1293 int err = -ENOTCONN;
1294
1295 lock_sock(sk);
1296
1297 if (sock->state == SS_UNCONNECTED)
1298 goto out;
1299
1300 err = 0;
1301 if (sock->state == SS_DISCONNECTING)
1302 goto out;
1303
1304 err = -EINVAL;
1305 if (scp->state == DN_O)
1306 goto out;
1307
1308 if (how != SHUT_RDWR)
1309 goto out;
1310
1311 sk->sk_shutdown = SHUTDOWN_MASK;
1312 dn_destroy_sock(sk);
1313 err = 0;
1314
1315 out:
1316 release_sock(sk);
1317
1318 return err;
1319 }
1320
dn_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)1321 static int dn_setsockopt(struct socket *sock, int level, int optname,
1322 sockptr_t optval, unsigned int optlen)
1323 {
1324 struct sock *sk = sock->sk;
1325 int err;
1326
1327 lock_sock(sk);
1328 err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1329 release_sock(sk);
1330 #ifdef CONFIG_NETFILTER
1331 /* we need to exclude all possible ENOPROTOOPTs except default case */
1332 if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
1333 optname != DSO_STREAM && optname != DSO_SEQPACKET)
1334 err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1335 #endif
1336
1337 return err;
1338 }
1339
__dn_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen,int flags)1340 static int __dn_setsockopt(struct socket *sock, int level, int optname,
1341 sockptr_t optval, unsigned int optlen, int flags)
1342 {
1343 struct sock *sk = sock->sk;
1344 struct dn_scp *scp = DN_SK(sk);
1345 long timeo;
1346 union {
1347 struct optdata_dn opt;
1348 struct accessdata_dn acc;
1349 int mode;
1350 unsigned long win;
1351 int val;
1352 unsigned char services;
1353 unsigned char info;
1354 } u;
1355 int err;
1356
1357 if (optlen && sockptr_is_null(optval))
1358 return -EINVAL;
1359
1360 if (optlen > sizeof(u))
1361 return -EINVAL;
1362
1363 if (copy_from_sockptr(&u, optval, optlen))
1364 return -EFAULT;
1365
1366 switch (optname) {
1367 case DSO_CONDATA:
1368 if (sock->state == SS_CONNECTED)
1369 return -EISCONN;
1370 if ((scp->state != DN_O) && (scp->state != DN_CR))
1371 return -EINVAL;
1372
1373 if (optlen != sizeof(struct optdata_dn))
1374 return -EINVAL;
1375
1376 if (le16_to_cpu(u.opt.opt_optl) > 16)
1377 return -EINVAL;
1378
1379 memcpy(&scp->conndata_out, &u.opt, optlen);
1380 break;
1381
1382 case DSO_DISDATA:
1383 if (sock->state != SS_CONNECTED &&
1384 scp->accept_mode == ACC_IMMED)
1385 return -ENOTCONN;
1386
1387 if (optlen != sizeof(struct optdata_dn))
1388 return -EINVAL;
1389
1390 if (le16_to_cpu(u.opt.opt_optl) > 16)
1391 return -EINVAL;
1392
1393 memcpy(&scp->discdata_out, &u.opt, optlen);
1394 break;
1395
1396 case DSO_CONACCESS:
1397 if (sock->state == SS_CONNECTED)
1398 return -EISCONN;
1399 if (scp->state != DN_O)
1400 return -EINVAL;
1401
1402 if (optlen != sizeof(struct accessdata_dn))
1403 return -EINVAL;
1404
1405 if ((u.acc.acc_accl > DN_MAXACCL) ||
1406 (u.acc.acc_passl > DN_MAXACCL) ||
1407 (u.acc.acc_userl > DN_MAXACCL))
1408 return -EINVAL;
1409
1410 memcpy(&scp->accessdata, &u.acc, optlen);
1411 break;
1412
1413 case DSO_ACCEPTMODE:
1414 if (sock->state == SS_CONNECTED)
1415 return -EISCONN;
1416 if (scp->state != DN_O)
1417 return -EINVAL;
1418
1419 if (optlen != sizeof(int))
1420 return -EINVAL;
1421
1422 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1423 return -EINVAL;
1424
1425 scp->accept_mode = (unsigned char)u.mode;
1426 break;
1427
1428 case DSO_CONACCEPT:
1429 if (scp->state != DN_CR)
1430 return -EINVAL;
1431 timeo = sock_rcvtimeo(sk, 0);
1432 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1433 return err;
1434
1435 case DSO_CONREJECT:
1436 if (scp->state != DN_CR)
1437 return -EINVAL;
1438
1439 scp->state = DN_DR;
1440 sk->sk_shutdown = SHUTDOWN_MASK;
1441 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1442 break;
1443
1444 case DSO_MAXWINDOW:
1445 if (optlen != sizeof(unsigned long))
1446 return -EINVAL;
1447 if (u.win > NSP_MAX_WINDOW)
1448 u.win = NSP_MAX_WINDOW;
1449 if (u.win == 0)
1450 return -EINVAL;
1451 scp->max_window = u.win;
1452 if (scp->snd_window > u.win)
1453 scp->snd_window = u.win;
1454 break;
1455
1456 case DSO_NODELAY:
1457 if (optlen != sizeof(int))
1458 return -EINVAL;
1459 if (scp->nonagle == TCP_NAGLE_CORK)
1460 return -EINVAL;
1461 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1462 /* if (scp->nonagle == 1) { Push pending frames } */
1463 break;
1464
1465 case DSO_CORK:
1466 if (optlen != sizeof(int))
1467 return -EINVAL;
1468 if (scp->nonagle == TCP_NAGLE_OFF)
1469 return -EINVAL;
1470 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1471 /* if (scp->nonagle == 0) { Push pending frames } */
1472 break;
1473
1474 case DSO_SERVICES:
1475 if (optlen != sizeof(unsigned char))
1476 return -EINVAL;
1477 if ((u.services & ~NSP_FC_MASK) != 0x01)
1478 return -EINVAL;
1479 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1480 return -EINVAL;
1481 scp->services_loc = u.services;
1482 break;
1483
1484 case DSO_INFO:
1485 if (optlen != sizeof(unsigned char))
1486 return -EINVAL;
1487 if (u.info & 0xfc)
1488 return -EINVAL;
1489 scp->info_loc = u.info;
1490 break;
1491
1492 case DSO_LINKINFO:
1493 case DSO_STREAM:
1494 case DSO_SEQPACKET:
1495 default:
1496 return -ENOPROTOOPT;
1497 }
1498
1499 return 0;
1500 }
1501
dn_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)1502 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1503 {
1504 struct sock *sk = sock->sk;
1505 int err;
1506
1507 lock_sock(sk);
1508 err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1509 release_sock(sk);
1510 #ifdef CONFIG_NETFILTER
1511 if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
1512 optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
1513 optname != DSO_CONREJECT) {
1514 int len;
1515
1516 if (get_user(len, optlen))
1517 return -EFAULT;
1518
1519 err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1520 if (err >= 0)
1521 err = put_user(len, optlen);
1522 }
1523 #endif
1524
1525 return err;
1526 }
1527
__dn_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen,int flags)1528 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1529 {
1530 struct sock *sk = sock->sk;
1531 struct dn_scp *scp = DN_SK(sk);
1532 struct linkinfo_dn link;
1533 unsigned int r_len;
1534 void *r_data = NULL;
1535 unsigned int val;
1536
1537 if(get_user(r_len , optlen))
1538 return -EFAULT;
1539
1540 switch (optname) {
1541 case DSO_CONDATA:
1542 if (r_len > sizeof(struct optdata_dn))
1543 r_len = sizeof(struct optdata_dn);
1544 r_data = &scp->conndata_in;
1545 break;
1546
1547 case DSO_DISDATA:
1548 if (r_len > sizeof(struct optdata_dn))
1549 r_len = sizeof(struct optdata_dn);
1550 r_data = &scp->discdata_in;
1551 break;
1552
1553 case DSO_CONACCESS:
1554 if (r_len > sizeof(struct accessdata_dn))
1555 r_len = sizeof(struct accessdata_dn);
1556 r_data = &scp->accessdata;
1557 break;
1558
1559 case DSO_ACCEPTMODE:
1560 if (r_len > sizeof(unsigned char))
1561 r_len = sizeof(unsigned char);
1562 r_data = &scp->accept_mode;
1563 break;
1564
1565 case DSO_LINKINFO:
1566 if (r_len > sizeof(struct linkinfo_dn))
1567 r_len = sizeof(struct linkinfo_dn);
1568
1569 memset(&link, 0, sizeof(link));
1570
1571 switch (sock->state) {
1572 case SS_CONNECTING:
1573 link.idn_linkstate = LL_CONNECTING;
1574 break;
1575 case SS_DISCONNECTING:
1576 link.idn_linkstate = LL_DISCONNECTING;
1577 break;
1578 case SS_CONNECTED:
1579 link.idn_linkstate = LL_RUNNING;
1580 break;
1581 default:
1582 link.idn_linkstate = LL_INACTIVE;
1583 }
1584
1585 link.idn_segsize = scp->segsize_rem;
1586 r_data = &link;
1587 break;
1588
1589 case DSO_MAXWINDOW:
1590 if (r_len > sizeof(unsigned long))
1591 r_len = sizeof(unsigned long);
1592 r_data = &scp->max_window;
1593 break;
1594
1595 case DSO_NODELAY:
1596 if (r_len > sizeof(int))
1597 r_len = sizeof(int);
1598 val = (scp->nonagle == TCP_NAGLE_OFF);
1599 r_data = &val;
1600 break;
1601
1602 case DSO_CORK:
1603 if (r_len > sizeof(int))
1604 r_len = sizeof(int);
1605 val = (scp->nonagle == TCP_NAGLE_CORK);
1606 r_data = &val;
1607 break;
1608
1609 case DSO_SERVICES:
1610 if (r_len > sizeof(unsigned char))
1611 r_len = sizeof(unsigned char);
1612 r_data = &scp->services_rem;
1613 break;
1614
1615 case DSO_INFO:
1616 if (r_len > sizeof(unsigned char))
1617 r_len = sizeof(unsigned char);
1618 r_data = &scp->info_rem;
1619 break;
1620
1621 case DSO_STREAM:
1622 case DSO_SEQPACKET:
1623 case DSO_CONACCEPT:
1624 case DSO_CONREJECT:
1625 default:
1626 return -ENOPROTOOPT;
1627 }
1628
1629 if (r_data) {
1630 if (copy_to_user(optval, r_data, r_len))
1631 return -EFAULT;
1632 if (put_user(r_len, optlen))
1633 return -EFAULT;
1634 }
1635
1636 return 0;
1637 }
1638
1639
dn_data_ready(struct sock * sk,struct sk_buff_head * q,int flags,int target)1640 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1641 {
1642 struct sk_buff *skb;
1643 int len = 0;
1644
1645 if (flags & MSG_OOB)
1646 return !skb_queue_empty(q) ? 1 : 0;
1647
1648 skb_queue_walk(q, skb) {
1649 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1650 len += skb->len;
1651
1652 if (cb->nsp_flags & 0x40) {
1653 /* SOCK_SEQPACKET reads to EOM */
1654 if (sk->sk_type == SOCK_SEQPACKET)
1655 return 1;
1656 /* so does SOCK_STREAM unless WAITALL is specified */
1657 if (!(flags & MSG_WAITALL))
1658 return 1;
1659 }
1660
1661 /* minimum data length for read exceeded */
1662 if (len >= target)
1663 return 1;
1664 }
1665
1666 return 0;
1667 }
1668
1669
dn_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1670 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1671 int flags)
1672 {
1673 struct sock *sk = sock->sk;
1674 struct dn_scp *scp = DN_SK(sk);
1675 struct sk_buff_head *queue = &sk->sk_receive_queue;
1676 size_t target = size > 1 ? 1 : 0;
1677 size_t copied = 0;
1678 int rv = 0;
1679 struct sk_buff *skb, *n;
1680 struct dn_skb_cb *cb = NULL;
1681 unsigned char eor = 0;
1682 long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1683
1684 lock_sock(sk);
1685
1686 if (sock_flag(sk, SOCK_ZAPPED)) {
1687 rv = -EADDRNOTAVAIL;
1688 goto out;
1689 }
1690
1691 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1692 rv = 0;
1693 goto out;
1694 }
1695
1696 rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1697 if (rv)
1698 goto out;
1699
1700 if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1701 rv = -EOPNOTSUPP;
1702 goto out;
1703 }
1704
1705 if (flags & MSG_OOB)
1706 queue = &scp->other_receive_queue;
1707
1708 if (flags & MSG_WAITALL)
1709 target = size;
1710
1711
1712 /*
1713 * See if there is data ready to read, sleep if there isn't
1714 */
1715 for(;;) {
1716 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1717
1718 if (sk->sk_err)
1719 goto out;
1720
1721 if (!skb_queue_empty(&scp->other_receive_queue)) {
1722 if (!(flags & MSG_OOB)) {
1723 msg->msg_flags |= MSG_OOB;
1724 if (!scp->other_report) {
1725 scp->other_report = 1;
1726 goto out;
1727 }
1728 }
1729 }
1730
1731 if (scp->state != DN_RUN)
1732 goto out;
1733
1734 if (signal_pending(current)) {
1735 rv = sock_intr_errno(timeo);
1736 goto out;
1737 }
1738
1739 if (dn_data_ready(sk, queue, flags, target))
1740 break;
1741
1742 if (flags & MSG_DONTWAIT) {
1743 rv = -EWOULDBLOCK;
1744 goto out;
1745 }
1746
1747 add_wait_queue(sk_sleep(sk), &wait);
1748 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1749 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1750 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1751 remove_wait_queue(sk_sleep(sk), &wait);
1752 }
1753
1754 skb_queue_walk_safe(queue, skb, n) {
1755 unsigned int chunk = skb->len;
1756 cb = DN_SKB_CB(skb);
1757
1758 if ((chunk + copied) > size)
1759 chunk = size - copied;
1760
1761 if (memcpy_to_msg(msg, skb->data, chunk)) {
1762 rv = -EFAULT;
1763 break;
1764 }
1765 copied += chunk;
1766
1767 if (!(flags & MSG_PEEK))
1768 skb_pull(skb, chunk);
1769
1770 eor = cb->nsp_flags & 0x40;
1771
1772 if (skb->len == 0) {
1773 skb_unlink(skb, queue);
1774 kfree_skb(skb);
1775 /*
1776 * N.B. Don't refer to skb or cb after this point
1777 * in loop.
1778 */
1779 if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1780 scp->flowloc_sw = DN_SEND;
1781 dn_nsp_send_link(sk, DN_SEND, 0);
1782 }
1783 }
1784
1785 if (eor) {
1786 if (sk->sk_type == SOCK_SEQPACKET)
1787 break;
1788 if (!(flags & MSG_WAITALL))
1789 break;
1790 }
1791
1792 if (flags & MSG_OOB)
1793 break;
1794
1795 if (copied >= target)
1796 break;
1797 }
1798
1799 rv = copied;
1800
1801
1802 if (eor && (sk->sk_type == SOCK_SEQPACKET))
1803 msg->msg_flags |= MSG_EOR;
1804
1805 out:
1806 if (rv == 0)
1807 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1808
1809 if ((rv >= 0) && msg->msg_name) {
1810 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1811 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1812 msg->msg_namelen = sizeof(struct sockaddr_dn);
1813 }
1814
1815 release_sock(sk);
1816
1817 return rv;
1818 }
1819
1820
dn_queue_too_long(struct dn_scp * scp,struct sk_buff_head * queue,int flags)1821 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1822 {
1823 unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1824 if (skb_queue_len(queue) >= scp->snd_window)
1825 return 1;
1826 if (fctype != NSP_FC_NONE) {
1827 if (flags & MSG_OOB) {
1828 if (scp->flowrem_oth == 0)
1829 return 1;
1830 } else {
1831 if (scp->flowrem_dat == 0)
1832 return 1;
1833 }
1834 }
1835 return 0;
1836 }
1837
1838 /*
1839 * The DECnet spec requires that the "routing layer" accepts packets which
1840 * are at least 230 bytes in size. This excludes any headers which the NSP
1841 * layer might add, so we always assume that we'll be using the maximal
1842 * length header on data packets. The variation in length is due to the
1843 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1844 * make much practical difference.
1845 */
dn_mss_from_pmtu(struct net_device * dev,int mtu)1846 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1847 {
1848 unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1849 if (dev) {
1850 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1851 mtu -= LL_RESERVED_SPACE(dev);
1852 if (dn_db->use_long)
1853 mtu -= 21;
1854 else
1855 mtu -= 6;
1856 mtu -= DN_MAX_NSP_DATA_HEADER;
1857 } else {
1858 /*
1859 * 21 = long header, 16 = guess at MAC header length
1860 */
1861 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1862 }
1863 if (mtu > mss)
1864 mss = mtu;
1865 return mss;
1866 }
1867
dn_current_mss(struct sock * sk,int flags)1868 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1869 {
1870 struct dst_entry *dst = __sk_dst_get(sk);
1871 struct dn_scp *scp = DN_SK(sk);
1872 int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1873
1874 /* Other data messages are limited to 16 bytes per packet */
1875 if (flags & MSG_OOB)
1876 return 16;
1877
1878 /* This works out the maximum size of segment we can send out */
1879 if (dst) {
1880 u32 mtu = dst_mtu(dst);
1881 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1882 }
1883
1884 return mss_now;
1885 }
1886
1887 /*
1888 * N.B. We get the timeout wrong here, but then we always did get it
1889 * wrong before and this is another step along the road to correcting
1890 * it. It ought to get updated each time we pass through the routine,
1891 * but in practise it probably doesn't matter too much for now.
1892 */
dn_alloc_send_pskb(struct sock * sk,unsigned long datalen,int noblock,int * errcode)1893 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1894 unsigned long datalen, int noblock,
1895 int *errcode)
1896 {
1897 struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1898 noblock, errcode);
1899 if (skb) {
1900 skb->protocol = htons(ETH_P_DNA_RT);
1901 skb->pkt_type = PACKET_OUTGOING;
1902 }
1903 return skb;
1904 }
1905
dn_sendmsg(struct socket * sock,struct msghdr * msg,size_t size)1906 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1907 {
1908 struct sock *sk = sock->sk;
1909 struct dn_scp *scp = DN_SK(sk);
1910 size_t mss;
1911 struct sk_buff_head *queue = &scp->data_xmit_queue;
1912 int flags = msg->msg_flags;
1913 int err = 0;
1914 size_t sent = 0;
1915 int addr_len = msg->msg_namelen;
1916 DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1917 struct sk_buff *skb = NULL;
1918 struct dn_skb_cb *cb;
1919 size_t len;
1920 unsigned char fctype;
1921 long timeo;
1922
1923 if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1924 return -EOPNOTSUPP;
1925
1926 if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1927 return -EINVAL;
1928
1929 lock_sock(sk);
1930 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1931 /*
1932 * The only difference between stream sockets and sequenced packet
1933 * sockets is that the stream sockets always behave as if MSG_EOR
1934 * has been set.
1935 */
1936 if (sock->type == SOCK_STREAM) {
1937 if (flags & MSG_EOR) {
1938 err = -EINVAL;
1939 goto out;
1940 }
1941 flags |= MSG_EOR;
1942 }
1943
1944
1945 err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1946 if (err)
1947 goto out_err;
1948
1949 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1950 err = -EPIPE;
1951 if (!(flags & MSG_NOSIGNAL))
1952 send_sig(SIGPIPE, current, 0);
1953 goto out_err;
1954 }
1955
1956 if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1957 dst_negative_advice(sk);
1958
1959 mss = scp->segsize_rem;
1960 fctype = scp->services_rem & NSP_FC_MASK;
1961
1962 mss = dn_current_mss(sk, flags);
1963
1964 if (flags & MSG_OOB) {
1965 queue = &scp->other_xmit_queue;
1966 if (size > mss) {
1967 err = -EMSGSIZE;
1968 goto out;
1969 }
1970 }
1971
1972 scp->persist_fxn = dn_nsp_xmit_timeout;
1973
1974 while(sent < size) {
1975 err = sock_error(sk);
1976 if (err)
1977 goto out;
1978
1979 if (signal_pending(current)) {
1980 err = sock_intr_errno(timeo);
1981 goto out;
1982 }
1983
1984 /*
1985 * Calculate size that we wish to send.
1986 */
1987 len = size - sent;
1988
1989 if (len > mss)
1990 len = mss;
1991
1992 /*
1993 * Wait for queue size to go down below the window
1994 * size.
1995 */
1996 if (dn_queue_too_long(scp, queue, flags)) {
1997 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1998
1999 if (flags & MSG_DONTWAIT) {
2000 err = -EWOULDBLOCK;
2001 goto out;
2002 }
2003
2004 add_wait_queue(sk_sleep(sk), &wait);
2005 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2006 sk_wait_event(sk, &timeo,
2007 !dn_queue_too_long(scp, queue, flags), &wait);
2008 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2009 remove_wait_queue(sk_sleep(sk), &wait);
2010 continue;
2011 }
2012
2013 /*
2014 * Get a suitably sized skb.
2015 * 64 is a bit of a hack really, but its larger than any
2016 * link-layer headers and has served us well as a good
2017 * guess as to their real length.
2018 */
2019 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2020 flags & MSG_DONTWAIT, &err);
2021
2022 if (err)
2023 break;
2024
2025 if (!skb)
2026 continue;
2027
2028 cb = DN_SKB_CB(skb);
2029
2030 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2031
2032 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2033 err = -EFAULT;
2034 goto out;
2035 }
2036
2037 if (flags & MSG_OOB) {
2038 cb->nsp_flags = 0x30;
2039 if (fctype != NSP_FC_NONE)
2040 scp->flowrem_oth--;
2041 } else {
2042 cb->nsp_flags = 0x00;
2043 if (scp->seg_total == 0)
2044 cb->nsp_flags |= 0x20;
2045
2046 scp->seg_total += len;
2047
2048 if (((sent + len) == size) && (flags & MSG_EOR)) {
2049 cb->nsp_flags |= 0x40;
2050 scp->seg_total = 0;
2051 if (fctype == NSP_FC_SCMC)
2052 scp->flowrem_dat--;
2053 }
2054 if (fctype == NSP_FC_SRC)
2055 scp->flowrem_dat--;
2056 }
2057
2058 sent += len;
2059 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2060 skb = NULL;
2061
2062 scp->persist = dn_nsp_persist(sk);
2063
2064 }
2065 out:
2066
2067 kfree_skb(skb);
2068
2069 release_sock(sk);
2070
2071 return sent ? sent : err;
2072
2073 out_err:
2074 err = sk_stream_error(sk, flags, err);
2075 release_sock(sk);
2076 return err;
2077 }
2078
dn_device_event(struct notifier_block * this,unsigned long event,void * ptr)2079 static int dn_device_event(struct notifier_block *this, unsigned long event,
2080 void *ptr)
2081 {
2082 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2083
2084 if (!net_eq(dev_net(dev), &init_net))
2085 return NOTIFY_DONE;
2086
2087 switch (event) {
2088 case NETDEV_UP:
2089 dn_dev_up(dev);
2090 break;
2091 case NETDEV_DOWN:
2092 dn_dev_down(dev);
2093 break;
2094 default:
2095 break;
2096 }
2097
2098 return NOTIFY_DONE;
2099 }
2100
2101 static struct notifier_block dn_dev_notifier = {
2102 .notifier_call = dn_device_event,
2103 };
2104
2105 static struct packet_type dn_dix_packet_type __read_mostly = {
2106 .type = cpu_to_be16(ETH_P_DNA_RT),
2107 .func = dn_route_rcv,
2108 };
2109
2110 #ifdef CONFIG_PROC_FS
2111 struct dn_iter_state {
2112 int bucket;
2113 };
2114
dn_socket_get_first(struct seq_file * seq)2115 static struct sock *dn_socket_get_first(struct seq_file *seq)
2116 {
2117 struct dn_iter_state *state = seq->private;
2118 struct sock *n = NULL;
2119
2120 for(state->bucket = 0;
2121 state->bucket < DN_SK_HASH_SIZE;
2122 ++state->bucket) {
2123 n = sk_head(&dn_sk_hash[state->bucket]);
2124 if (n)
2125 break;
2126 }
2127
2128 return n;
2129 }
2130
dn_socket_get_next(struct seq_file * seq,struct sock * n)2131 static struct sock *dn_socket_get_next(struct seq_file *seq,
2132 struct sock *n)
2133 {
2134 struct dn_iter_state *state = seq->private;
2135
2136 n = sk_next(n);
2137 while (!n) {
2138 if (++state->bucket >= DN_SK_HASH_SIZE)
2139 break;
2140 n = sk_head(&dn_sk_hash[state->bucket]);
2141 }
2142 return n;
2143 }
2144
socket_get_idx(struct seq_file * seq,loff_t * pos)2145 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2146 {
2147 struct sock *sk = dn_socket_get_first(seq);
2148
2149 if (sk) {
2150 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2151 --*pos;
2152 }
2153 return *pos ? NULL : sk;
2154 }
2155
dn_socket_get_idx(struct seq_file * seq,loff_t pos)2156 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2157 {
2158 void *rc;
2159 read_lock_bh(&dn_hash_lock);
2160 rc = socket_get_idx(seq, &pos);
2161 if (!rc) {
2162 read_unlock_bh(&dn_hash_lock);
2163 }
2164 return rc;
2165 }
2166
dn_socket_seq_start(struct seq_file * seq,loff_t * pos)2167 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2168 {
2169 return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2170 }
2171
dn_socket_seq_next(struct seq_file * seq,void * v,loff_t * pos)2172 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2173 {
2174 void *rc;
2175
2176 if (v == SEQ_START_TOKEN) {
2177 rc = dn_socket_get_idx(seq, 0);
2178 goto out;
2179 }
2180
2181 rc = dn_socket_get_next(seq, v);
2182 if (rc)
2183 goto out;
2184 read_unlock_bh(&dn_hash_lock);
2185 out:
2186 ++*pos;
2187 return rc;
2188 }
2189
dn_socket_seq_stop(struct seq_file * seq,void * v)2190 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2191 {
2192 if (v && v != SEQ_START_TOKEN)
2193 read_unlock_bh(&dn_hash_lock);
2194 }
2195
2196 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2197
dn_printable_object(struct sockaddr_dn * dn,unsigned char * buf)2198 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2199 {
2200 int i;
2201
2202 switch (le16_to_cpu(dn->sdn_objnamel)) {
2203 case 0:
2204 sprintf(buf, "%d", dn->sdn_objnum);
2205 break;
2206 default:
2207 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2208 buf[i] = dn->sdn_objname[i];
2209 if (IS_NOT_PRINTABLE(buf[i]))
2210 buf[i] = '.';
2211 }
2212 buf[i] = 0;
2213 }
2214 }
2215
dn_state2asc(unsigned char state)2216 static char *dn_state2asc(unsigned char state)
2217 {
2218 switch (state) {
2219 case DN_O:
2220 return "OPEN";
2221 case DN_CR:
2222 return " CR";
2223 case DN_DR:
2224 return " DR";
2225 case DN_DRC:
2226 return " DRC";
2227 case DN_CC:
2228 return " CC";
2229 case DN_CI:
2230 return " CI";
2231 case DN_NR:
2232 return " NR";
2233 case DN_NC:
2234 return " NC";
2235 case DN_CD:
2236 return " CD";
2237 case DN_RJ:
2238 return " RJ";
2239 case DN_RUN:
2240 return " RUN";
2241 case DN_DI:
2242 return " DI";
2243 case DN_DIC:
2244 return " DIC";
2245 case DN_DN:
2246 return " DN";
2247 case DN_CL:
2248 return " CL";
2249 case DN_CN:
2250 return " CN";
2251 }
2252
2253 return "????";
2254 }
2255
dn_socket_format_entry(struct seq_file * seq,struct sock * sk)2256 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2257 {
2258 struct dn_scp *scp = DN_SK(sk);
2259 char buf1[DN_ASCBUF_LEN];
2260 char buf2[DN_ASCBUF_LEN];
2261 char local_object[DN_MAXOBJL+3];
2262 char remote_object[DN_MAXOBJL+3];
2263
2264 dn_printable_object(&scp->addr, local_object);
2265 dn_printable_object(&scp->peer, remote_object);
2266
2267 seq_printf(seq,
2268 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2269 "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2270 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2271 scp->addrloc,
2272 scp->numdat,
2273 scp->numoth,
2274 scp->ackxmt_dat,
2275 scp->ackxmt_oth,
2276 scp->flowloc_sw,
2277 local_object,
2278 dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2279 scp->addrrem,
2280 scp->numdat_rcv,
2281 scp->numoth_rcv,
2282 scp->ackrcv_dat,
2283 scp->ackrcv_oth,
2284 scp->flowrem_sw,
2285 remote_object,
2286 dn_state2asc(scp->state),
2287 ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2288 }
2289
dn_socket_seq_show(struct seq_file * seq,void * v)2290 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2291 {
2292 if (v == SEQ_START_TOKEN) {
2293 seq_puts(seq, "Local Remote\n");
2294 } else {
2295 dn_socket_format_entry(seq, v);
2296 }
2297 return 0;
2298 }
2299
2300 static const struct seq_operations dn_socket_seq_ops = {
2301 .start = dn_socket_seq_start,
2302 .next = dn_socket_seq_next,
2303 .stop = dn_socket_seq_stop,
2304 .show = dn_socket_seq_show,
2305 };
2306 #endif
2307
2308 static const struct net_proto_family dn_family_ops = {
2309 .family = AF_DECnet,
2310 .create = dn_create,
2311 .owner = THIS_MODULE,
2312 };
2313
2314 static const struct proto_ops dn_proto_ops = {
2315 .family = AF_DECnet,
2316 .owner = THIS_MODULE,
2317 .release = dn_release,
2318 .bind = dn_bind,
2319 .connect = dn_connect,
2320 .socketpair = sock_no_socketpair,
2321 .accept = dn_accept,
2322 .getname = dn_getname,
2323 .poll = dn_poll,
2324 .ioctl = dn_ioctl,
2325 .listen = dn_listen,
2326 .shutdown = dn_shutdown,
2327 .setsockopt = dn_setsockopt,
2328 .getsockopt = dn_getsockopt,
2329 .sendmsg = dn_sendmsg,
2330 .recvmsg = dn_recvmsg,
2331 .mmap = sock_no_mmap,
2332 .sendpage = sock_no_sendpage,
2333 };
2334
2335 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2336 MODULE_AUTHOR("Linux DECnet Project Team");
2337 MODULE_LICENSE("GPL");
2338 MODULE_ALIAS_NETPROTO(PF_DECnet);
2339
2340 static const char banner[] __initconst = KERN_INFO
2341 "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2342
decnet_init(void)2343 static int __init decnet_init(void)
2344 {
2345 int rc;
2346
2347 printk(banner);
2348
2349 rc = proto_register(&dn_proto, 1);
2350 if (rc != 0)
2351 goto out;
2352
2353 dn_neigh_init();
2354 dn_dev_init();
2355 dn_route_init();
2356 dn_fib_init();
2357
2358 sock_register(&dn_family_ops);
2359 dev_add_pack(&dn_dix_packet_type);
2360 register_netdevice_notifier(&dn_dev_notifier);
2361
2362 proc_create_seq_private("decnet", 0444, init_net.proc_net,
2363 &dn_socket_seq_ops, sizeof(struct dn_iter_state),
2364 NULL);
2365 dn_register_sysctl();
2366 out:
2367 return rc;
2368
2369 }
2370 module_init(decnet_init);
2371
2372 /*
2373 * Prevent DECnet module unloading until its fixed properly.
2374 * Requires an audit of the code to check for memory leaks and
2375 * initialisation problems etc.
2376 */
2377 #if 0
2378 static void __exit decnet_exit(void)
2379 {
2380 sock_unregister(AF_DECnet);
2381 rtnl_unregister_all(PF_DECnet);
2382 dev_remove_pack(&dn_dix_packet_type);
2383
2384 dn_unregister_sysctl();
2385
2386 unregister_netdevice_notifier(&dn_dev_notifier);
2387
2388 dn_route_cleanup();
2389 dn_dev_cleanup();
2390 dn_neigh_cleanup();
2391 dn_fib_cleanup();
2392
2393 remove_proc_entry("decnet", init_net.proc_net);
2394
2395 proto_unregister(&dn_proto);
2396
2397 rcu_barrier(); /* Wait for completion of call_rcu()'s */
2398 }
2399 module_exit(decnet_exit);
2400 #endif
2401
