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/ioctls.h>
123 #include <linux/capability.h>
124 #include <linux/mm.h>
125 #include <linux/interrupt.h>
126 #include <linux/proc_fs.h>
127 #include <linux/stat.h>
128 #include <linux/init.h>
129 #include <linux/poll.h>
130 #include <linux/jiffies.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 
180 	if (port == 0)
181 		return -1;
182 
183 	sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
184 		struct dn_scp *scp = DN_SK(sk);
185 		if (scp->addrloc == port)
186 			return -1;
187 	}
188 	return 0;
189 }
190 
port_alloc(struct sock * sk)191 static unsigned short port_alloc(struct sock *sk)
192 {
193 	struct dn_scp *scp = DN_SK(sk);
194 static unsigned short port = 0x2000;
195 	unsigned short i_port = port;
196 
197 	while(check_port(cpu_to_le16(++port)) != 0) {
198 		if (port == i_port)
199 			return 0;
200 	}
201 
202 	scp->addrloc = cpu_to_le16(port);
203 
204 	return 1;
205 }
206 
207 /*
208  * Since this is only ever called from user
209  * level, we don't need a write_lock() version
210  * of this.
211  */
dn_hash_sock(struct sock * sk)212 static int dn_hash_sock(struct sock *sk)
213 {
214 	struct dn_scp *scp = DN_SK(sk);
215 	struct hlist_head *list;
216 	int rv = -EUSERS;
217 
218 	BUG_ON(sk_hashed(sk));
219 
220 	write_lock_bh(&dn_hash_lock);
221 
222 	if (!scp->addrloc && !port_alloc(sk))
223 		goto out;
224 
225 	rv = -EADDRINUSE;
226 	if ((list = dn_find_list(sk)) == NULL)
227 		goto out;
228 
229 	sk_add_node(sk, list);
230 	rv = 0;
231 out:
232 	write_unlock_bh(&dn_hash_lock);
233 	return rv;
234 }
235 
dn_unhash_sock(struct sock * sk)236 static void dn_unhash_sock(struct sock *sk)
237 {
238 	write_lock(&dn_hash_lock);
239 	sk_del_node_init(sk);
240 	write_unlock(&dn_hash_lock);
241 }
242 
dn_unhash_sock_bh(struct sock * sk)243 static void dn_unhash_sock_bh(struct sock *sk)
244 {
245 	write_lock_bh(&dn_hash_lock);
246 	sk_del_node_init(sk);
247 	write_unlock_bh(&dn_hash_lock);
248 }
249 
listen_hash(struct sockaddr_dn * addr)250 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
251 {
252 	int i;
253 	unsigned int hash = addr->sdn_objnum;
254 
255 	if (hash == 0) {
256 		hash = addr->sdn_objnamel;
257 		for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
258 			hash ^= addr->sdn_objname[i];
259 			hash ^= (hash << 3);
260 		}
261 	}
262 
263 	return &dn_sk_hash[hash & DN_SK_HASH_MASK];
264 }
265 
266 /*
267  * Called to transform a socket from bound (i.e. with a local address)
268  * into a listening socket (doesn't need a local port number) and rehashes
269  * based upon the object name/number.
270  */
dn_rehash_sock(struct sock * sk)271 static void dn_rehash_sock(struct sock *sk)
272 {
273 	struct hlist_head *list;
274 	struct dn_scp *scp = DN_SK(sk);
275 
276 	if (scp->addr.sdn_flags & SDF_WILD)
277 		return;
278 
279 	write_lock_bh(&dn_hash_lock);
280 	sk_del_node_init(sk);
281 	DN_SK(sk)->addrloc = 0;
282 	list = listen_hash(&DN_SK(sk)->addr);
283 	sk_add_node(sk, list);
284 	write_unlock_bh(&dn_hash_lock);
285 }
286 
dn_sockaddr2username(struct sockaddr_dn * sdn,unsigned char * buf,unsigned char type)287 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
288 {
289 	int len = 2;
290 
291 	*buf++ = type;
292 
293 	switch (type) {
294 	case 0:
295 		*buf++ = sdn->sdn_objnum;
296 		break;
297 	case 1:
298 		*buf++ = 0;
299 		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
300 		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
301 		len = 3 + le16_to_cpu(sdn->sdn_objnamel);
302 		break;
303 	case 2:
304 		memset(buf, 0, 5);
305 		buf += 5;
306 		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
307 		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
308 		len = 7 + le16_to_cpu(sdn->sdn_objnamel);
309 		break;
310 	}
311 
312 	return len;
313 }
314 
315 /*
316  * On reception of usernames, we handle types 1 and 0 for destination
317  * addresses only. Types 2 and 4 are used for source addresses, but the
318  * UIC, GIC are ignored and they are both treated the same way. Type 3
319  * is never used as I've no idea what its purpose might be or what its
320  * format is.
321  */
dn_username2sockaddr(unsigned char * data,int len,struct sockaddr_dn * sdn,unsigned char * fmt)322 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
323 {
324 	unsigned char type;
325 	int size = len;
326 	int namel = 12;
327 
328 	sdn->sdn_objnum = 0;
329 	sdn->sdn_objnamel = cpu_to_le16(0);
330 	memset(sdn->sdn_objname, 0, DN_MAXOBJL);
331 
332 	if (len < 2)
333 		return -1;
334 
335 	len -= 2;
336 	*fmt = *data++;
337 	type = *data++;
338 
339 	switch (*fmt) {
340 	case 0:
341 		sdn->sdn_objnum = type;
342 		return 2;
343 	case 1:
344 		namel = 16;
345 		break;
346 	case 2:
347 		len  -= 4;
348 		data += 4;
349 		break;
350 	case 4:
351 		len  -= 8;
352 		data += 8;
353 		break;
354 	default:
355 		return -1;
356 	}
357 
358 	len -= 1;
359 
360 	if (len < 0)
361 		return -1;
362 
363 	sdn->sdn_objnamel = cpu_to_le16(*data++);
364 	len -= le16_to_cpu(sdn->sdn_objnamel);
365 
366 	if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
367 		return -1;
368 
369 	memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
370 
371 	return size - len;
372 }
373 
dn_sklist_find_listener(struct sockaddr_dn * addr)374 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
375 {
376 	struct hlist_head *list = listen_hash(addr);
377 	struct sock *sk;
378 
379 	read_lock(&dn_hash_lock);
380 	sk_for_each(sk, list) {
381 		struct dn_scp *scp = DN_SK(sk);
382 		if (sk->sk_state != TCP_LISTEN)
383 			continue;
384 		if (scp->addr.sdn_objnum) {
385 			if (scp->addr.sdn_objnum != addr->sdn_objnum)
386 				continue;
387 		} else {
388 			if (addr->sdn_objnum)
389 				continue;
390 			if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
391 				continue;
392 			if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
393 				continue;
394 		}
395 		sock_hold(sk);
396 		read_unlock(&dn_hash_lock);
397 		return sk;
398 	}
399 
400 	sk = sk_head(&dn_wild_sk);
401 	if (sk) {
402 		if (sk->sk_state == TCP_LISTEN)
403 			sock_hold(sk);
404 		else
405 			sk = NULL;
406 	}
407 
408 	read_unlock(&dn_hash_lock);
409 	return sk;
410 }
411 
dn_find_by_skb(struct sk_buff * skb)412 struct sock *dn_find_by_skb(struct sk_buff *skb)
413 {
414 	struct dn_skb_cb *cb = DN_SKB_CB(skb);
415 	struct sock *sk;
416 	struct dn_scp *scp;
417 
418 	read_lock(&dn_hash_lock);
419 	sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
420 		scp = DN_SK(sk);
421 		if (cb->src != dn_saddr2dn(&scp->peer))
422 			continue;
423 		if (cb->dst_port != scp->addrloc)
424 			continue;
425 		if (scp->addrrem && (cb->src_port != scp->addrrem))
426 			continue;
427 		sock_hold(sk);
428 		goto found;
429 	}
430 	sk = NULL;
431 found:
432 	read_unlock(&dn_hash_lock);
433 	return sk;
434 }
435 
436 
437 
dn_destruct(struct sock * sk)438 static void dn_destruct(struct sock *sk)
439 {
440 	struct dn_scp *scp = DN_SK(sk);
441 
442 	skb_queue_purge(&scp->data_xmit_queue);
443 	skb_queue_purge(&scp->other_xmit_queue);
444 	skb_queue_purge(&scp->other_receive_queue);
445 
446 	dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
447 }
448 
449 static int dn_memory_pressure;
450 
dn_enter_memory_pressure(struct sock * sk)451 static void dn_enter_memory_pressure(struct sock *sk)
452 {
453 	if (!dn_memory_pressure) {
454 		dn_memory_pressure = 1;
455 	}
456 }
457 
458 static struct proto dn_proto = {
459 	.name			= "NSP",
460 	.owner			= THIS_MODULE,
461 	.enter_memory_pressure	= dn_enter_memory_pressure,
462 	.memory_pressure	= &dn_memory_pressure,
463 	.memory_allocated	= &decnet_memory_allocated,
464 	.sysctl_mem		= sysctl_decnet_mem,
465 	.sysctl_wmem		= sysctl_decnet_wmem,
466 	.sysctl_rmem		= sysctl_decnet_rmem,
467 	.max_header		= DN_MAX_NSP_DATA_HEADER + 64,
468 	.obj_size		= sizeof(struct dn_sock),
469 };
470 
dn_alloc_sock(struct net * net,struct socket * sock,gfp_t gfp,int kern)471 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
472 {
473 	struct dn_scp *scp;
474 	struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
475 
476 	if  (!sk)
477 		goto out;
478 
479 	if (sock)
480 		sock->ops = &dn_proto_ops;
481 	sock_init_data(sock, sk);
482 
483 	sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
484 	sk->sk_destruct    = dn_destruct;
485 	sk->sk_no_check_tx = 1;
486 	sk->sk_family      = PF_DECnet;
487 	sk->sk_protocol    = 0;
488 	sk->sk_allocation  = gfp;
489 	sk->sk_sndbuf	   = sysctl_decnet_wmem[1];
490 	sk->sk_rcvbuf	   = sysctl_decnet_rmem[1];
491 
492 	/* Initialization of DECnet Session Control Port		*/
493 	scp = DN_SK(sk);
494 	scp->state	= DN_O;		/* Open			*/
495 	scp->numdat	= 1;		/* Next data seg to tx	*/
496 	scp->numoth	= 1;		/* Next oth data to tx  */
497 	scp->ackxmt_dat = 0;		/* Last data seg ack'ed */
498 	scp->ackxmt_oth = 0;		/* Last oth data ack'ed */
499 	scp->ackrcv_dat = 0;		/* Highest data ack recv*/
500 	scp->ackrcv_oth = 0;		/* Last oth data ack rec*/
501 	scp->flowrem_sw = DN_SEND;
502 	scp->flowloc_sw = DN_SEND;
503 	scp->flowrem_dat = 0;
504 	scp->flowrem_oth = 1;
505 	scp->flowloc_dat = 0;
506 	scp->flowloc_oth = 1;
507 	scp->services_rem = 0;
508 	scp->services_loc = 1 | NSP_FC_NONE;
509 	scp->info_rem = 0;
510 	scp->info_loc = 0x03; /* NSP version 4.1 */
511 	scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
512 	scp->nonagle = 0;
513 	scp->multi_ireq = 1;
514 	scp->accept_mode = ACC_IMMED;
515 	scp->addr.sdn_family    = AF_DECnet;
516 	scp->peer.sdn_family    = AF_DECnet;
517 	scp->accessdata.acc_accl = 5;
518 	memcpy(scp->accessdata.acc_acc, "LINUX", 5);
519 
520 	scp->max_window   = NSP_MAX_WINDOW;
521 	scp->snd_window   = NSP_MIN_WINDOW;
522 	scp->nsp_srtt     = NSP_INITIAL_SRTT;
523 	scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
524 	scp->nsp_rxtshift = 0;
525 
526 	skb_queue_head_init(&scp->data_xmit_queue);
527 	skb_queue_head_init(&scp->other_xmit_queue);
528 	skb_queue_head_init(&scp->other_receive_queue);
529 
530 	scp->persist = 0;
531 	scp->persist_fxn = NULL;
532 	scp->keepalive = 10 * HZ;
533 	scp->keepalive_fxn = dn_keepalive;
534 
535 	init_timer(&scp->delack_timer);
536 	scp->delack_pending = 0;
537 	scp->delack_fxn = dn_nsp_delayed_ack;
538 
539 	dn_start_slow_timer(sk);
540 out:
541 	return sk;
542 }
543 
544 /*
545  * Keepalive timer.
546  * FIXME: Should respond to SO_KEEPALIVE etc.
547  */
dn_keepalive(struct sock * sk)548 static void dn_keepalive(struct sock *sk)
549 {
550 	struct dn_scp *scp = DN_SK(sk);
551 
552 	/*
553 	 * By checking the other_data transmit queue is empty
554 	 * we are double checking that we are not sending too
555 	 * many of these keepalive frames.
556 	 */
557 	if (skb_queue_empty(&scp->other_xmit_queue))
558 		dn_nsp_send_link(sk, DN_NOCHANGE, 0);
559 }
560 
561 
562 /*
563  * Timer for shutdown/destroyed sockets.
564  * When socket is dead & no packets have been sent for a
565  * certain amount of time, they are removed by this
566  * routine. Also takes care of sending out DI & DC
567  * frames at correct times.
568  */
dn_destroy_timer(struct sock * sk)569 int dn_destroy_timer(struct sock *sk)
570 {
571 	struct dn_scp *scp = DN_SK(sk);
572 
573 	scp->persist = dn_nsp_persist(sk);
574 
575 	switch (scp->state) {
576 	case DN_DI:
577 		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
578 		if (scp->nsp_rxtshift >= decnet_di_count)
579 			scp->state = DN_CN;
580 		return 0;
581 
582 	case DN_DR:
583 		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
584 		if (scp->nsp_rxtshift >= decnet_dr_count)
585 			scp->state = DN_DRC;
586 		return 0;
587 
588 	case DN_DN:
589 		if (scp->nsp_rxtshift < decnet_dn_count) {
590 			/* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
591 			dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
592 					 GFP_ATOMIC);
593 			return 0;
594 		}
595 	}
596 
597 	scp->persist = (HZ * decnet_time_wait);
598 
599 	if (sk->sk_socket)
600 		return 0;
601 
602 	if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
603 		dn_unhash_sock(sk);
604 		sock_put(sk);
605 		return 1;
606 	}
607 
608 	return 0;
609 }
610 
dn_destroy_sock(struct sock * sk)611 static void dn_destroy_sock(struct sock *sk)
612 {
613 	struct dn_scp *scp = DN_SK(sk);
614 
615 	scp->nsp_rxtshift = 0; /* reset back off */
616 
617 	if (sk->sk_socket) {
618 		if (sk->sk_socket->state != SS_UNCONNECTED)
619 			sk->sk_socket->state = SS_DISCONNECTING;
620 	}
621 
622 	sk->sk_state = TCP_CLOSE;
623 
624 	switch (scp->state) {
625 	case DN_DN:
626 		dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
627 				 sk->sk_allocation);
628 		scp->persist_fxn = dn_destroy_timer;
629 		scp->persist = dn_nsp_persist(sk);
630 		break;
631 	case DN_CR:
632 		scp->state = DN_DR;
633 		goto disc_reject;
634 	case DN_RUN:
635 		scp->state = DN_DI;
636 	case DN_DI:
637 	case DN_DR:
638 disc_reject:
639 		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
640 	case DN_NC:
641 	case DN_NR:
642 	case DN_RJ:
643 	case DN_DIC:
644 	case DN_CN:
645 	case DN_DRC:
646 	case DN_CI:
647 	case DN_CD:
648 		scp->persist_fxn = dn_destroy_timer;
649 		scp->persist = dn_nsp_persist(sk);
650 		break;
651 	default:
652 		printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
653 	case DN_O:
654 		dn_stop_slow_timer(sk);
655 
656 		dn_unhash_sock_bh(sk);
657 		sock_put(sk);
658 
659 		break;
660 	}
661 }
662 
dn_addr2asc(__u16 addr,char * buf)663 char *dn_addr2asc(__u16 addr, char *buf)
664 {
665 	unsigned short node, area;
666 
667 	node = addr & 0x03ff;
668 	area = addr >> 10;
669 	sprintf(buf, "%hd.%hd", area, node);
670 
671 	return buf;
672 }
673 
674 
675 
dn_create(struct net * net,struct socket * sock,int protocol,int kern)676 static int dn_create(struct net *net, struct socket *sock, int protocol,
677 		     int kern)
678 {
679 	struct sock *sk;
680 
681 	if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
682 		return -EINVAL;
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, kern)) == 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 	struct dst_entry *dst;
914 
915 	if (sock->state == SS_CONNECTED)
916 		goto out;
917 
918 	if (sock->state == SS_CONNECTING) {
919 		err = 0;
920 		if (scp->state == DN_RUN) {
921 			sock->state = SS_CONNECTED;
922 			goto out;
923 		}
924 		err = -ECONNREFUSED;
925 		if (scp->state != DN_CI && scp->state != DN_CC) {
926 			sock->state = SS_UNCONNECTED;
927 			goto out;
928 		}
929 		return dn_wait_run(sk, timeo);
930 	}
931 
932 	err = -EINVAL;
933 	if (scp->state != DN_O)
934 		goto out;
935 
936 	if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
937 		goto out;
938 	if (addr->sdn_family != AF_DECnet)
939 		goto out;
940 	if (addr->sdn_flags & SDF_WILD)
941 		goto out;
942 
943 	if (sock_flag(sk, SOCK_ZAPPED)) {
944 		err = dn_auto_bind(sk->sk_socket);
945 		if (err)
946 			goto out;
947 	}
948 
949 	memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
950 
951 	err = -EHOSTUNREACH;
952 	memset(&fld, 0, sizeof(fld));
953 	fld.flowidn_oif = sk->sk_bound_dev_if;
954 	fld.daddr = dn_saddr2dn(&scp->peer);
955 	fld.saddr = dn_saddr2dn(&scp->addr);
956 	dn_sk_ports_copy(&fld, scp);
957 	fld.flowidn_proto = DNPROTO_NSP;
958 	if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
959 		goto out;
960 	dst = __sk_dst_get(sk);
961 	sk->sk_route_caps = dst->dev->features;
962 	sock->state = SS_CONNECTING;
963 	scp->state = DN_CI;
964 	scp->segsize_loc = dst_metric_advmss(dst);
965 
966 	dn_nsp_send_conninit(sk, NSP_CI);
967 	err = -EINPROGRESS;
968 	if (*timeo) {
969 		err = dn_wait_run(sk, timeo);
970 	}
971 out:
972 	return err;
973 }
974 
dn_connect(struct socket * sock,struct sockaddr * uaddr,int addrlen,int flags)975 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
976 {
977 	struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
978 	struct sock *sk = sock->sk;
979 	int err;
980 	long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
981 
982 	lock_sock(sk);
983 	err = __dn_connect(sk, addr, addrlen, &timeo, 0);
984 	release_sock(sk);
985 
986 	return err;
987 }
988 
dn_check_state(struct sock * sk,struct sockaddr_dn * addr,int addrlen,long * timeo,int flags)989 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
990 {
991 	struct dn_scp *scp = DN_SK(sk);
992 
993 	switch (scp->state) {
994 	case DN_RUN:
995 		return 0;
996 	case DN_CR:
997 		return dn_confirm_accept(sk, timeo, sk->sk_allocation);
998 	case DN_CI:
999 	case DN_CC:
1000 		return dn_wait_run(sk, timeo);
1001 	case DN_O:
1002 		return __dn_connect(sk, addr, addrlen, timeo, flags);
1003 	}
1004 
1005 	return -EINVAL;
1006 }
1007 
1008 
dn_access_copy(struct sk_buff * skb,struct accessdata_dn * acc)1009 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1010 {
1011 	unsigned char *ptr = skb->data;
1012 
1013 	acc->acc_userl = *ptr++;
1014 	memcpy(&acc->acc_user, ptr, acc->acc_userl);
1015 	ptr += acc->acc_userl;
1016 
1017 	acc->acc_passl = *ptr++;
1018 	memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1019 	ptr += acc->acc_passl;
1020 
1021 	acc->acc_accl = *ptr++;
1022 	memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1023 
1024 	skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1025 
1026 }
1027 
dn_user_copy(struct sk_buff * skb,struct optdata_dn * opt)1028 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1029 {
1030 	unsigned char *ptr = skb->data;
1031 	u16 len = *ptr++; /* yes, it's 8bit on the wire */
1032 
1033 	BUG_ON(len > 16); /* we've checked the contents earlier */
1034 	opt->opt_optl   = cpu_to_le16(len);
1035 	opt->opt_status = 0;
1036 	memcpy(opt->opt_data, ptr, len);
1037 	skb_pull(skb, len + 1);
1038 }
1039 
dn_wait_for_connect(struct sock * sk,long * timeo)1040 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1041 {
1042 	DEFINE_WAIT(wait);
1043 	struct sk_buff *skb = NULL;
1044 	int err = 0;
1045 
1046 	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1047 	for(;;) {
1048 		release_sock(sk);
1049 		skb = skb_dequeue(&sk->sk_receive_queue);
1050 		if (skb == NULL) {
1051 			*timeo = schedule_timeout(*timeo);
1052 			skb = skb_dequeue(&sk->sk_receive_queue);
1053 		}
1054 		lock_sock(sk);
1055 		if (skb != NULL)
1056 			break;
1057 		err = -EINVAL;
1058 		if (sk->sk_state != TCP_LISTEN)
1059 			break;
1060 		err = sock_intr_errno(*timeo);
1061 		if (signal_pending(current))
1062 			break;
1063 		err = -EAGAIN;
1064 		if (!*timeo)
1065 			break;
1066 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1067 	}
1068 	finish_wait(sk_sleep(sk), &wait);
1069 
1070 	return skb == NULL ? ERR_PTR(err) : skb;
1071 }
1072 
dn_accept(struct socket * sock,struct socket * newsock,int flags)1073 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1074 {
1075 	struct sock *sk = sock->sk, *newsk;
1076 	struct sk_buff *skb = NULL;
1077 	struct dn_skb_cb *cb;
1078 	unsigned char menuver;
1079 	int err = 0;
1080 	unsigned char type;
1081 	long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1082 	struct dst_entry *dst;
1083 
1084 	lock_sock(sk);
1085 
1086 	if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1087 		release_sock(sk);
1088 		return -EINVAL;
1089 	}
1090 
1091 	skb = skb_dequeue(&sk->sk_receive_queue);
1092 	if (skb == NULL) {
1093 		skb = dn_wait_for_connect(sk, &timeo);
1094 		if (IS_ERR(skb)) {
1095 			release_sock(sk);
1096 			return PTR_ERR(skb);
1097 		}
1098 	}
1099 
1100 	cb = DN_SKB_CB(skb);
1101 	sk->sk_ack_backlog--;
1102 	newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, 0);
1103 	if (newsk == NULL) {
1104 		release_sock(sk);
1105 		kfree_skb(skb);
1106 		return -ENOBUFS;
1107 	}
1108 	release_sock(sk);
1109 
1110 	dst = skb_dst(skb);
1111 	sk_dst_set(newsk, dst);
1112 	skb_dst_set(skb, NULL);
1113 
1114 	DN_SK(newsk)->state        = DN_CR;
1115 	DN_SK(newsk)->addrrem      = cb->src_port;
1116 	DN_SK(newsk)->services_rem = cb->services;
1117 	DN_SK(newsk)->info_rem     = cb->info;
1118 	DN_SK(newsk)->segsize_rem  = cb->segsize;
1119 	DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1120 
1121 	if (DN_SK(newsk)->segsize_rem < 230)
1122 		DN_SK(newsk)->segsize_rem = 230;
1123 
1124 	if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1125 		DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1126 
1127 	newsk->sk_state  = TCP_LISTEN;
1128 	memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1129 
1130 	/*
1131 	 * If we are listening on a wild socket, we don't want
1132 	 * the newly created socket on the wrong hash queue.
1133 	 */
1134 	DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1135 
1136 	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1137 	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1138 	*(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1139 	*(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1140 
1141 	menuver = *skb->data;
1142 	skb_pull(skb, 1);
1143 
1144 	if (menuver & DN_MENUVER_ACC)
1145 		dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1146 
1147 	if (menuver & DN_MENUVER_USR)
1148 		dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1149 
1150 	if (menuver & DN_MENUVER_PRX)
1151 		DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1152 
1153 	if (menuver & DN_MENUVER_UIC)
1154 		DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1155 
1156 	kfree_skb(skb);
1157 
1158 	memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1159 		sizeof(struct optdata_dn));
1160 	memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1161 		sizeof(struct optdata_dn));
1162 
1163 	lock_sock(newsk);
1164 	err = dn_hash_sock(newsk);
1165 	if (err == 0) {
1166 		sock_reset_flag(newsk, SOCK_ZAPPED);
1167 		dn_send_conn_ack(newsk);
1168 
1169 		/*
1170 		 * Here we use sk->sk_allocation since although the conn conf is
1171 		 * for the newsk, the context is the old socket.
1172 		 */
1173 		if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1174 			err = dn_confirm_accept(newsk, &timeo,
1175 						sk->sk_allocation);
1176 	}
1177 	release_sock(newsk);
1178 	return err;
1179 }
1180 
1181 
dn_getname(struct socket * sock,struct sockaddr * uaddr,int * uaddr_len,int peer)1182 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1183 {
1184 	struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1185 	struct sock *sk = sock->sk;
1186 	struct dn_scp *scp = DN_SK(sk);
1187 
1188 	*uaddr_len = sizeof(struct sockaddr_dn);
1189 
1190 	lock_sock(sk);
1191 
1192 	if (peer) {
1193 		if ((sock->state != SS_CONNECTED &&
1194 		     sock->state != SS_CONNECTING) &&
1195 		    scp->accept_mode == ACC_IMMED) {
1196 			release_sock(sk);
1197 			return -ENOTCONN;
1198 		}
1199 
1200 		memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1201 	} else {
1202 		memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1203 	}
1204 
1205 	release_sock(sk);
1206 
1207 	return 0;
1208 }
1209 
1210 
dn_poll(struct file * file,struct socket * sock,poll_table * wait)1211 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1212 {
1213 	struct sock *sk = sock->sk;
1214 	struct dn_scp *scp = DN_SK(sk);
1215 	int mask = datagram_poll(file, sock, wait);
1216 
1217 	if (!skb_queue_empty(&scp->other_receive_queue))
1218 		mask |= POLLRDBAND;
1219 
1220 	return mask;
1221 }
1222 
dn_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)1223 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1224 {
1225 	struct sock *sk = sock->sk;
1226 	struct dn_scp *scp = DN_SK(sk);
1227 	int err = -EOPNOTSUPP;
1228 	long amount = 0;
1229 	struct sk_buff *skb;
1230 	int val;
1231 
1232 	switch(cmd)
1233 	{
1234 	case SIOCGIFADDR:
1235 	case SIOCSIFADDR:
1236 		return dn_dev_ioctl(cmd, (void __user *)arg);
1237 
1238 	case SIOCATMARK:
1239 		lock_sock(sk);
1240 		val = !skb_queue_empty(&scp->other_receive_queue);
1241 		if (scp->state != DN_RUN)
1242 			val = -ENOTCONN;
1243 		release_sock(sk);
1244 		return val;
1245 
1246 	case TIOCOUTQ:
1247 		amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1248 		if (amount < 0)
1249 			amount = 0;
1250 		err = put_user(amount, (int __user *)arg);
1251 		break;
1252 
1253 	case TIOCINQ:
1254 		lock_sock(sk);
1255 		skb = skb_peek(&scp->other_receive_queue);
1256 		if (skb) {
1257 			amount = skb->len;
1258 		} else {
1259 			skb_queue_walk(&sk->sk_receive_queue, skb)
1260 				amount += skb->len;
1261 		}
1262 		release_sock(sk);
1263 		err = put_user(amount, (int __user *)arg);
1264 		break;
1265 
1266 	default:
1267 		err = -ENOIOCTLCMD;
1268 		break;
1269 	}
1270 
1271 	return err;
1272 }
1273 
dn_listen(struct socket * sock,int backlog)1274 static int dn_listen(struct socket *sock, int backlog)
1275 {
1276 	struct sock *sk = sock->sk;
1277 	int err = -EINVAL;
1278 
1279 	lock_sock(sk);
1280 
1281 	if (sock_flag(sk, SOCK_ZAPPED))
1282 		goto out;
1283 
1284 	if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1285 		goto out;
1286 
1287 	sk->sk_max_ack_backlog = backlog;
1288 	sk->sk_ack_backlog     = 0;
1289 	sk->sk_state           = TCP_LISTEN;
1290 	err                 = 0;
1291 	dn_rehash_sock(sk);
1292 
1293 out:
1294 	release_sock(sk);
1295 
1296 	return err;
1297 }
1298 
1299 
dn_shutdown(struct socket * sock,int how)1300 static int dn_shutdown(struct socket *sock, int how)
1301 {
1302 	struct sock *sk = sock->sk;
1303 	struct dn_scp *scp = DN_SK(sk);
1304 	int err = -ENOTCONN;
1305 
1306 	lock_sock(sk);
1307 
1308 	if (sock->state == SS_UNCONNECTED)
1309 		goto out;
1310 
1311 	err = 0;
1312 	if (sock->state == SS_DISCONNECTING)
1313 		goto out;
1314 
1315 	err = -EINVAL;
1316 	if (scp->state == DN_O)
1317 		goto out;
1318 
1319 	if (how != SHUT_RDWR)
1320 		goto out;
1321 
1322 	sk->sk_shutdown = SHUTDOWN_MASK;
1323 	dn_destroy_sock(sk);
1324 	err = 0;
1325 
1326 out:
1327 	release_sock(sk);
1328 
1329 	return err;
1330 }
1331 
dn_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)1332 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1333 {
1334 	struct sock *sk = sock->sk;
1335 	int err;
1336 
1337 	lock_sock(sk);
1338 	err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1339 	release_sock(sk);
1340 
1341 	return err;
1342 }
1343 
__dn_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen,int flags)1344 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1345 {
1346 	struct	sock *sk = sock->sk;
1347 	struct dn_scp *scp = DN_SK(sk);
1348 	long timeo;
1349 	union {
1350 		struct optdata_dn opt;
1351 		struct accessdata_dn acc;
1352 		int mode;
1353 		unsigned long win;
1354 		int val;
1355 		unsigned char services;
1356 		unsigned char info;
1357 	} u;
1358 	int err;
1359 
1360 	if (optlen && !optval)
1361 		return -EINVAL;
1362 
1363 	if (optlen > sizeof(u))
1364 		return -EINVAL;
1365 
1366 	if (copy_from_user(&u, optval, optlen))
1367 		return -EFAULT;
1368 
1369 	switch (optname) {
1370 	case DSO_CONDATA:
1371 		if (sock->state == SS_CONNECTED)
1372 			return -EISCONN;
1373 		if ((scp->state != DN_O) && (scp->state != DN_CR))
1374 			return -EINVAL;
1375 
1376 		if (optlen != sizeof(struct optdata_dn))
1377 			return -EINVAL;
1378 
1379 		if (le16_to_cpu(u.opt.opt_optl) > 16)
1380 			return -EINVAL;
1381 
1382 		memcpy(&scp->conndata_out, &u.opt, optlen);
1383 		break;
1384 
1385 	case DSO_DISDATA:
1386 		if (sock->state != SS_CONNECTED &&
1387 		    scp->accept_mode == ACC_IMMED)
1388 			return -ENOTCONN;
1389 
1390 		if (optlen != sizeof(struct optdata_dn))
1391 			return -EINVAL;
1392 
1393 		if (le16_to_cpu(u.opt.opt_optl) > 16)
1394 			return -EINVAL;
1395 
1396 		memcpy(&scp->discdata_out, &u.opt, optlen);
1397 		break;
1398 
1399 	case DSO_CONACCESS:
1400 		if (sock->state == SS_CONNECTED)
1401 			return -EISCONN;
1402 		if (scp->state != DN_O)
1403 			return -EINVAL;
1404 
1405 		if (optlen != sizeof(struct accessdata_dn))
1406 			return -EINVAL;
1407 
1408 		if ((u.acc.acc_accl > DN_MAXACCL) ||
1409 		    (u.acc.acc_passl > DN_MAXACCL) ||
1410 		    (u.acc.acc_userl > DN_MAXACCL))
1411 			return -EINVAL;
1412 
1413 		memcpy(&scp->accessdata, &u.acc, optlen);
1414 		break;
1415 
1416 	case DSO_ACCEPTMODE:
1417 		if (sock->state == SS_CONNECTED)
1418 			return -EISCONN;
1419 		if (scp->state != DN_O)
1420 			return -EINVAL;
1421 
1422 		if (optlen != sizeof(int))
1423 			return -EINVAL;
1424 
1425 		if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1426 			return -EINVAL;
1427 
1428 		scp->accept_mode = (unsigned char)u.mode;
1429 		break;
1430 
1431 	case DSO_CONACCEPT:
1432 		if (scp->state != DN_CR)
1433 			return -EINVAL;
1434 		timeo = sock_rcvtimeo(sk, 0);
1435 		err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1436 		return err;
1437 
1438 	case DSO_CONREJECT:
1439 		if (scp->state != DN_CR)
1440 			return -EINVAL;
1441 
1442 		scp->state = DN_DR;
1443 		sk->sk_shutdown = SHUTDOWN_MASK;
1444 		dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1445 		break;
1446 
1447 	default:
1448 #ifdef CONFIG_NETFILTER
1449 		return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1450 #endif
1451 	case DSO_LINKINFO:
1452 	case DSO_STREAM:
1453 	case DSO_SEQPACKET:
1454 		return -ENOPROTOOPT;
1455 
1456 	case DSO_MAXWINDOW:
1457 		if (optlen != sizeof(unsigned long))
1458 			return -EINVAL;
1459 		if (u.win > NSP_MAX_WINDOW)
1460 			u.win = NSP_MAX_WINDOW;
1461 		if (u.win == 0)
1462 			return -EINVAL;
1463 		scp->max_window = u.win;
1464 		if (scp->snd_window > u.win)
1465 			scp->snd_window = u.win;
1466 		break;
1467 
1468 	case DSO_NODELAY:
1469 		if (optlen != sizeof(int))
1470 			return -EINVAL;
1471 		if (scp->nonagle == 2)
1472 			return -EINVAL;
1473 		scp->nonagle = (u.val == 0) ? 0 : 1;
1474 		/* if (scp->nonagle == 1) { Push pending frames } */
1475 		break;
1476 
1477 	case DSO_CORK:
1478 		if (optlen != sizeof(int))
1479 			return -EINVAL;
1480 		if (scp->nonagle == 1)
1481 			return -EINVAL;
1482 		scp->nonagle = (u.val == 0) ? 0 : 2;
1483 		/* if (scp->nonagle == 0) { Push pending frames } */
1484 		break;
1485 
1486 	case DSO_SERVICES:
1487 		if (optlen != sizeof(unsigned char))
1488 			return -EINVAL;
1489 		if ((u.services & ~NSP_FC_MASK) != 0x01)
1490 			return -EINVAL;
1491 		if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1492 			return -EINVAL;
1493 		scp->services_loc = u.services;
1494 		break;
1495 
1496 	case DSO_INFO:
1497 		if (optlen != sizeof(unsigned char))
1498 			return -EINVAL;
1499 		if (u.info & 0xfc)
1500 			return -EINVAL;
1501 		scp->info_loc = u.info;
1502 		break;
1503 	}
1504 
1505 	return 0;
1506 }
1507 
dn_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)1508 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1509 {
1510 	struct sock *sk = sock->sk;
1511 	int err;
1512 
1513 	lock_sock(sk);
1514 	err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1515 	release_sock(sk);
1516 
1517 	return err;
1518 }
1519 
__dn_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen,int flags)1520 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1521 {
1522 	struct	sock *sk = sock->sk;
1523 	struct dn_scp *scp = DN_SK(sk);
1524 	struct linkinfo_dn link;
1525 	unsigned int r_len;
1526 	void *r_data = NULL;
1527 	unsigned int val;
1528 
1529 	if(get_user(r_len , optlen))
1530 		return -EFAULT;
1531 
1532 	switch (optname) {
1533 	case DSO_CONDATA:
1534 		if (r_len > sizeof(struct optdata_dn))
1535 			r_len = sizeof(struct optdata_dn);
1536 		r_data = &scp->conndata_in;
1537 		break;
1538 
1539 	case DSO_DISDATA:
1540 		if (r_len > sizeof(struct optdata_dn))
1541 			r_len = sizeof(struct optdata_dn);
1542 		r_data = &scp->discdata_in;
1543 		break;
1544 
1545 	case DSO_CONACCESS:
1546 		if (r_len > sizeof(struct accessdata_dn))
1547 			r_len = sizeof(struct accessdata_dn);
1548 		r_data = &scp->accessdata;
1549 		break;
1550 
1551 	case DSO_ACCEPTMODE:
1552 		if (r_len > sizeof(unsigned char))
1553 			r_len = sizeof(unsigned char);
1554 		r_data = &scp->accept_mode;
1555 		break;
1556 
1557 	case DSO_LINKINFO:
1558 		if (r_len > sizeof(struct linkinfo_dn))
1559 			r_len = sizeof(struct linkinfo_dn);
1560 
1561 		memset(&link, 0, sizeof(link));
1562 
1563 		switch (sock->state) {
1564 		case SS_CONNECTING:
1565 			link.idn_linkstate = LL_CONNECTING;
1566 			break;
1567 		case SS_DISCONNECTING:
1568 			link.idn_linkstate = LL_DISCONNECTING;
1569 			break;
1570 		case SS_CONNECTED:
1571 			link.idn_linkstate = LL_RUNNING;
1572 			break;
1573 		default:
1574 			link.idn_linkstate = LL_INACTIVE;
1575 		}
1576 
1577 		link.idn_segsize = scp->segsize_rem;
1578 		r_data = &link;
1579 		break;
1580 
1581 	default:
1582 #ifdef CONFIG_NETFILTER
1583 	{
1584 		int ret, len;
1585 
1586 		if (get_user(len, optlen))
1587 			return -EFAULT;
1588 
1589 		ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1590 		if (ret >= 0)
1591 			ret = put_user(len, optlen);
1592 		return ret;
1593 	}
1594 #endif
1595 	case DSO_STREAM:
1596 	case DSO_SEQPACKET:
1597 	case DSO_CONACCEPT:
1598 	case DSO_CONREJECT:
1599 		return -ENOPROTOOPT;
1600 
1601 	case DSO_MAXWINDOW:
1602 		if (r_len > sizeof(unsigned long))
1603 			r_len = sizeof(unsigned long);
1604 		r_data = &scp->max_window;
1605 		break;
1606 
1607 	case DSO_NODELAY:
1608 		if (r_len > sizeof(int))
1609 			r_len = sizeof(int);
1610 		val = (scp->nonagle == 1);
1611 		r_data = &val;
1612 		break;
1613 
1614 	case DSO_CORK:
1615 		if (r_len > sizeof(int))
1616 			r_len = sizeof(int);
1617 		val = (scp->nonagle == 2);
1618 		r_data = &val;
1619 		break;
1620 
1621 	case DSO_SERVICES:
1622 		if (r_len > sizeof(unsigned char))
1623 			r_len = sizeof(unsigned char);
1624 		r_data = &scp->services_rem;
1625 		break;
1626 
1627 	case DSO_INFO:
1628 		if (r_len > sizeof(unsigned char))
1629 			r_len = sizeof(unsigned char);
1630 		r_data = &scp->info_rem;
1631 		break;
1632 	}
1633 
1634 	if (r_data) {
1635 		if (copy_to_user(optval, r_data, r_len))
1636 			return -EFAULT;
1637 		if (put_user(r_len, optlen))
1638 			return -EFAULT;
1639 	}
1640 
1641 	return 0;
1642 }
1643 
1644 
dn_data_ready(struct sock * sk,struct sk_buff_head * q,int flags,int target)1645 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1646 {
1647 	struct sk_buff *skb;
1648 	int len = 0;
1649 
1650 	if (flags & MSG_OOB)
1651 		return !skb_queue_empty(q) ? 1 : 0;
1652 
1653 	skb_queue_walk(q, skb) {
1654 		struct dn_skb_cb *cb = DN_SKB_CB(skb);
1655 		len += skb->len;
1656 
1657 		if (cb->nsp_flags & 0x40) {
1658 			/* SOCK_SEQPACKET reads to EOM */
1659 			if (sk->sk_type == SOCK_SEQPACKET)
1660 				return 1;
1661 			/* so does SOCK_STREAM unless WAITALL is specified */
1662 			if (!(flags & MSG_WAITALL))
1663 				return 1;
1664 		}
1665 
1666 		/* minimum data length for read exceeded */
1667 		if (len >= target)
1668 			return 1;
1669 	}
1670 
1671 	return 0;
1672 }
1673 
1674 
dn_recvmsg(struct socket * sock,struct msghdr * msg,size_t size,int flags)1675 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1676 		      int flags)
1677 {
1678 	struct sock *sk = sock->sk;
1679 	struct dn_scp *scp = DN_SK(sk);
1680 	struct sk_buff_head *queue = &sk->sk_receive_queue;
1681 	size_t target = size > 1 ? 1 : 0;
1682 	size_t copied = 0;
1683 	int rv = 0;
1684 	struct sk_buff *skb, *n;
1685 	struct dn_skb_cb *cb = NULL;
1686 	unsigned char eor = 0;
1687 	long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1688 
1689 	lock_sock(sk);
1690 
1691 	if (sock_flag(sk, SOCK_ZAPPED)) {
1692 		rv = -EADDRNOTAVAIL;
1693 		goto out;
1694 	}
1695 
1696 	if (sk->sk_shutdown & RCV_SHUTDOWN) {
1697 		rv = 0;
1698 		goto out;
1699 	}
1700 
1701 	rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1702 	if (rv)
1703 		goto out;
1704 
1705 	if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1706 		rv = -EOPNOTSUPP;
1707 		goto out;
1708 	}
1709 
1710 	if (flags & MSG_OOB)
1711 		queue = &scp->other_receive_queue;
1712 
1713 	if (flags & MSG_WAITALL)
1714 		target = size;
1715 
1716 
1717 	/*
1718 	 * See if there is data ready to read, sleep if there isn't
1719 	 */
1720 	for(;;) {
1721 		DEFINE_WAIT(wait);
1722 
1723 		if (sk->sk_err)
1724 			goto out;
1725 
1726 		if (!skb_queue_empty(&scp->other_receive_queue)) {
1727 			if (!(flags & MSG_OOB)) {
1728 				msg->msg_flags |= MSG_OOB;
1729 				if (!scp->other_report) {
1730 					scp->other_report = 1;
1731 					goto out;
1732 				}
1733 			}
1734 		}
1735 
1736 		if (scp->state != DN_RUN)
1737 			goto out;
1738 
1739 		if (signal_pending(current)) {
1740 			rv = sock_intr_errno(timeo);
1741 			goto out;
1742 		}
1743 
1744 		if (dn_data_ready(sk, queue, flags, target))
1745 			break;
1746 
1747 		if (flags & MSG_DONTWAIT) {
1748 			rv = -EWOULDBLOCK;
1749 			goto out;
1750 		}
1751 
1752 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1753 		sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1754 		sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1755 		sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1756 		finish_wait(sk_sleep(sk), &wait);
1757 	}
1758 
1759 	skb_queue_walk_safe(queue, skb, n) {
1760 		unsigned int chunk = skb->len;
1761 		cb = DN_SKB_CB(skb);
1762 
1763 		if ((chunk + copied) > size)
1764 			chunk = size - copied;
1765 
1766 		if (memcpy_to_msg(msg, skb->data, chunk)) {
1767 			rv = -EFAULT;
1768 			break;
1769 		}
1770 		copied += chunk;
1771 
1772 		if (!(flags & MSG_PEEK))
1773 			skb_pull(skb, chunk);
1774 
1775 		eor = cb->nsp_flags & 0x40;
1776 
1777 		if (skb->len == 0) {
1778 			skb_unlink(skb, queue);
1779 			kfree_skb(skb);
1780 			/*
1781 			 * N.B. Don't refer to skb or cb after this point
1782 			 * in loop.
1783 			 */
1784 			if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1785 				scp->flowloc_sw = DN_SEND;
1786 				dn_nsp_send_link(sk, DN_SEND, 0);
1787 			}
1788 		}
1789 
1790 		if (eor) {
1791 			if (sk->sk_type == SOCK_SEQPACKET)
1792 				break;
1793 			if (!(flags & MSG_WAITALL))
1794 				break;
1795 		}
1796 
1797 		if (flags & MSG_OOB)
1798 			break;
1799 
1800 		if (copied >= target)
1801 			break;
1802 	}
1803 
1804 	rv = copied;
1805 
1806 
1807 	if (eor && (sk->sk_type == SOCK_SEQPACKET))
1808 		msg->msg_flags |= MSG_EOR;
1809 
1810 out:
1811 	if (rv == 0)
1812 		rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1813 
1814 	if ((rv >= 0) && msg->msg_name) {
1815 		__sockaddr_check_size(sizeof(struct sockaddr_dn));
1816 		memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1817 		msg->msg_namelen = sizeof(struct sockaddr_dn);
1818 	}
1819 
1820 	release_sock(sk);
1821 
1822 	return rv;
1823 }
1824 
1825 
dn_queue_too_long(struct dn_scp * scp,struct sk_buff_head * queue,int flags)1826 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1827 {
1828 	unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1829 	if (skb_queue_len(queue) >= scp->snd_window)
1830 		return 1;
1831 	if (fctype != NSP_FC_NONE) {
1832 		if (flags & MSG_OOB) {
1833 			if (scp->flowrem_oth == 0)
1834 				return 1;
1835 		} else {
1836 			if (scp->flowrem_dat == 0)
1837 				return 1;
1838 		}
1839 	}
1840 	return 0;
1841 }
1842 
1843 /*
1844  * The DECnet spec requires that the "routing layer" accepts packets which
1845  * are at least 230 bytes in size. This excludes any headers which the NSP
1846  * layer might add, so we always assume that we'll be using the maximal
1847  * length header on data packets. The variation in length is due to the
1848  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1849  * make much practical difference.
1850  */
dn_mss_from_pmtu(struct net_device * dev,int mtu)1851 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1852 {
1853 	unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1854 	if (dev) {
1855 		struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1856 		mtu -= LL_RESERVED_SPACE(dev);
1857 		if (dn_db->use_long)
1858 			mtu -= 21;
1859 		else
1860 			mtu -= 6;
1861 		mtu -= DN_MAX_NSP_DATA_HEADER;
1862 	} else {
1863 		/*
1864 		 * 21 = long header, 16 = guess at MAC header length
1865 		 */
1866 		mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1867 	}
1868 	if (mtu > mss)
1869 		mss = mtu;
1870 	return mss;
1871 }
1872 
dn_current_mss(struct sock * sk,int flags)1873 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1874 {
1875 	struct dst_entry *dst = __sk_dst_get(sk);
1876 	struct dn_scp *scp = DN_SK(sk);
1877 	int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1878 
1879 	/* Other data messages are limited to 16 bytes per packet */
1880 	if (flags & MSG_OOB)
1881 		return 16;
1882 
1883 	/* This works out the maximum size of segment we can send out */
1884 	if (dst) {
1885 		u32 mtu = dst_mtu(dst);
1886 		mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1887 	}
1888 
1889 	return mss_now;
1890 }
1891 
1892 /*
1893  * N.B. We get the timeout wrong here, but then we always did get it
1894  * wrong before and this is another step along the road to correcting
1895  * it. It ought to get updated each time we pass through the routine,
1896  * but in practise it probably doesn't matter too much for now.
1897  */
dn_alloc_send_pskb(struct sock * sk,unsigned long datalen,int noblock,int * errcode)1898 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1899 			      unsigned long datalen, int noblock,
1900 			      int *errcode)
1901 {
1902 	struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1903 						   noblock, errcode);
1904 	if (skb) {
1905 		skb->protocol = htons(ETH_P_DNA_RT);
1906 		skb->pkt_type = PACKET_OUTGOING;
1907 	}
1908 	return skb;
1909 }
1910 
dn_sendmsg(struct socket * sock,struct msghdr * msg,size_t size)1911 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1912 {
1913 	struct sock *sk = sock->sk;
1914 	struct dn_scp *scp = DN_SK(sk);
1915 	size_t mss;
1916 	struct sk_buff_head *queue = &scp->data_xmit_queue;
1917 	int flags = msg->msg_flags;
1918 	int err = 0;
1919 	size_t sent = 0;
1920 	int addr_len = msg->msg_namelen;
1921 	DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1922 	struct sk_buff *skb = NULL;
1923 	struct dn_skb_cb *cb;
1924 	size_t len;
1925 	unsigned char fctype;
1926 	long timeo;
1927 
1928 	if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1929 		return -EOPNOTSUPP;
1930 
1931 	if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1932 		return -EINVAL;
1933 
1934 	lock_sock(sk);
1935 	timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1936 	/*
1937 	 * The only difference between stream sockets and sequenced packet
1938 	 * sockets is that the stream sockets always behave as if MSG_EOR
1939 	 * has been set.
1940 	 */
1941 	if (sock->type == SOCK_STREAM) {
1942 		if (flags & MSG_EOR) {
1943 			err = -EINVAL;
1944 			goto out;
1945 		}
1946 		flags |= MSG_EOR;
1947 	}
1948 
1949 
1950 	err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1951 	if (err)
1952 		goto out_err;
1953 
1954 	if (sk->sk_shutdown & SEND_SHUTDOWN) {
1955 		err = -EPIPE;
1956 		if (!(flags & MSG_NOSIGNAL))
1957 			send_sig(SIGPIPE, current, 0);
1958 		goto out_err;
1959 	}
1960 
1961 	if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1962 		dst_negative_advice(sk);
1963 
1964 	mss = scp->segsize_rem;
1965 	fctype = scp->services_rem & NSP_FC_MASK;
1966 
1967 	mss = dn_current_mss(sk, flags);
1968 
1969 	if (flags & MSG_OOB) {
1970 		queue = &scp->other_xmit_queue;
1971 		if (size > mss) {
1972 			err = -EMSGSIZE;
1973 			goto out;
1974 		}
1975 	}
1976 
1977 	scp->persist_fxn = dn_nsp_xmit_timeout;
1978 
1979 	while(sent < size) {
1980 		err = sock_error(sk);
1981 		if (err)
1982 			goto out;
1983 
1984 		if (signal_pending(current)) {
1985 			err = sock_intr_errno(timeo);
1986 			goto out;
1987 		}
1988 
1989 		/*
1990 		 * Calculate size that we wish to send.
1991 		 */
1992 		len = size - sent;
1993 
1994 		if (len > mss)
1995 			len = mss;
1996 
1997 		/*
1998 		 * Wait for queue size to go down below the window
1999 		 * size.
2000 		 */
2001 		if (dn_queue_too_long(scp, queue, flags)) {
2002 			DEFINE_WAIT(wait);
2003 
2004 			if (flags & MSG_DONTWAIT) {
2005 				err = -EWOULDBLOCK;
2006 				goto out;
2007 			}
2008 
2009 			prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2010 			sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2011 			sk_wait_event(sk, &timeo,
2012 				      !dn_queue_too_long(scp, queue, flags));
2013 			sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2014 			finish_wait(sk_sleep(sk), &wait);
2015 			continue;
2016 		}
2017 
2018 		/*
2019 		 * Get a suitably sized skb.
2020 		 * 64 is a bit of a hack really, but its larger than any
2021 		 * link-layer headers and has served us well as a good
2022 		 * guess as to their real length.
2023 		 */
2024 		skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2025 					 flags & MSG_DONTWAIT, &err);
2026 
2027 		if (err)
2028 			break;
2029 
2030 		if (!skb)
2031 			continue;
2032 
2033 		cb = DN_SKB_CB(skb);
2034 
2035 		skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2036 
2037 		if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2038 			err = -EFAULT;
2039 			goto out;
2040 		}
2041 
2042 		if (flags & MSG_OOB) {
2043 			cb->nsp_flags = 0x30;
2044 			if (fctype != NSP_FC_NONE)
2045 				scp->flowrem_oth--;
2046 		} else {
2047 			cb->nsp_flags = 0x00;
2048 			if (scp->seg_total == 0)
2049 				cb->nsp_flags |= 0x20;
2050 
2051 			scp->seg_total += len;
2052 
2053 			if (((sent + len) == size) && (flags & MSG_EOR)) {
2054 				cb->nsp_flags |= 0x40;
2055 				scp->seg_total = 0;
2056 				if (fctype == NSP_FC_SCMC)
2057 					scp->flowrem_dat--;
2058 			}
2059 			if (fctype == NSP_FC_SRC)
2060 				scp->flowrem_dat--;
2061 		}
2062 
2063 		sent += len;
2064 		dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2065 		skb = NULL;
2066 
2067 		scp->persist = dn_nsp_persist(sk);
2068 
2069 	}
2070 out:
2071 
2072 	kfree_skb(skb);
2073 
2074 	release_sock(sk);
2075 
2076 	return sent ? sent : err;
2077 
2078 out_err:
2079 	err = sk_stream_error(sk, flags, err);
2080 	release_sock(sk);
2081 	return err;
2082 }
2083 
dn_device_event(struct notifier_block * this,unsigned long event,void * ptr)2084 static int dn_device_event(struct notifier_block *this, unsigned long event,
2085 			   void *ptr)
2086 {
2087 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2088 
2089 	if (!net_eq(dev_net(dev), &init_net))
2090 		return NOTIFY_DONE;
2091 
2092 	switch (event) {
2093 	case NETDEV_UP:
2094 		dn_dev_up(dev);
2095 		break;
2096 	case NETDEV_DOWN:
2097 		dn_dev_down(dev);
2098 		break;
2099 	default:
2100 		break;
2101 	}
2102 
2103 	return NOTIFY_DONE;
2104 }
2105 
2106 static struct notifier_block dn_dev_notifier = {
2107 	.notifier_call = dn_device_event,
2108 };
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 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2358 MODULE_AUTHOR("Linux DECnet Project Team");
2359 MODULE_LICENSE("GPL");
2360 MODULE_ALIAS_NETPROTO(PF_DECnet);
2361 
2362 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2363 
decnet_init(void)2364 static int __init decnet_init(void)
2365 {
2366 	int rc;
2367 
2368 	printk(banner);
2369 
2370 	rc = proto_register(&dn_proto, 1);
2371 	if (rc != 0)
2372 		goto out;
2373 
2374 	dn_neigh_init();
2375 	dn_dev_init();
2376 	dn_route_init();
2377 	dn_fib_init();
2378 
2379 	sock_register(&dn_family_ops);
2380 	dev_add_pack(&dn_dix_packet_type);
2381 	register_netdevice_notifier(&dn_dev_notifier);
2382 
2383 	proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
2384 	dn_register_sysctl();
2385 out:
2386 	return rc;
2387 
2388 }
2389 module_init(decnet_init);
2390 
2391 /*
2392  * Prevent DECnet module unloading until its fixed properly.
2393  * Requires an audit of the code to check for memory leaks and
2394  * initialisation problems etc.
2395  */
2396 #if 0
2397 static void __exit decnet_exit(void)
2398 {
2399 	sock_unregister(AF_DECnet);
2400 	rtnl_unregister_all(PF_DECnet);
2401 	dev_remove_pack(&dn_dix_packet_type);
2402 
2403 	dn_unregister_sysctl();
2404 
2405 	unregister_netdevice_notifier(&dn_dev_notifier);
2406 
2407 	dn_route_cleanup();
2408 	dn_dev_cleanup();
2409 	dn_neigh_cleanup();
2410 	dn_fib_cleanup();
2411 
2412 	remove_proc_entry("decnet", init_net.proc_net);
2413 
2414 	proto_unregister(&dn_proto);
2415 
2416 	rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2417 }
2418 module_exit(decnet_exit);
2419 #endif
2420