aboutsummaryrefslogtreecommitdiff
path: root/net/econet/af_econet.c
blob: 70fb2b88da652f9b8b48894deafb46771c183ab4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
/*
 *	An implementation of the Acorn Econet and AUN protocols.
 *	Philip Blundell <philb@gnu.org>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
 */

#include <linux/config.h>
#include <linux/module.h>

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/route.h>
#include <linux/inet.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <net/sock.h>
#include <net/inet_common.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/if_ec.h>
#include <net/udp.h>
#include <net/ip.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/bitops.h>

#include <asm/uaccess.h>
#include <asm/system.h>

static const struct proto_ops econet_ops;
static struct hlist_head econet_sklist;
static DEFINE_RWLOCK(econet_lock);

/* Since there are only 256 possible network numbers (or fewer, depends
   how you count) it makes sense to use a simple lookup table. */
static struct net_device *net2dev_map[256];

#define EC_PORT_IP	0xd2

#ifdef CONFIG_ECONET_AUNUDP
static spinlock_t aun_queue_lock;
static struct socket *udpsock;
#define AUN_PORT	0x8000


struct aunhdr
{
	unsigned char code;		/* AUN magic protocol byte */
	unsigned char port;
	unsigned char cb;
	unsigned char pad;
	unsigned long handle;
};

static unsigned long aun_seq;

/* Queue of packets waiting to be transmitted. */
static struct sk_buff_head aun_queue;
static struct timer_list ab_cleanup_timer;

#endif		/* CONFIG_ECONET_AUNUDP */

/* Per-packet information */
struct ec_cb
{
	struct sockaddr_ec sec;
	unsigned long cookie;		/* Supplied by user. */
#ifdef CONFIG_ECONET_AUNUDP
	int done;
	unsigned long seq;		/* Sequencing */
	unsigned long timeout;		/* Timeout */
	unsigned long start;		/* jiffies */
#endif
#ifdef CONFIG_ECONET_NATIVE
	void (*sent)(struct sk_buff *, int result);
#endif
};

static void econet_remove_socket(struct hlist_head *list, struct sock *sk)
{
	write_lock_bh(&econet_lock);
	sk_del_node_init(sk);
	write_unlock_bh(&econet_lock);
}

static void econet_insert_socket(struct hlist_head *list, struct sock *sk)
{
	write_lock_bh(&econet_lock);
	sk_add_node(sk, list);
	write_unlock_bh(&econet_lock);
}

/*
 *	Pull a packet from our receive queue and hand it to the user.
 *	If necessary we block.
 */

static int econet_recvmsg(struct kiocb *iocb, struct socket *sock,
			  struct msghdr *msg, size_t len, int flags)
{
	struct sock *sk = sock->sk;
	struct sk_buff *skb;
	size_t copied;
	int err;

	msg->msg_namelen = sizeof(struct sockaddr_ec);

	/*
	 *	Call the generic datagram receiver. This handles all sorts
	 *	of horrible races and re-entrancy so we can forget about it
	 *	in the protocol layers.
	 *
	 *	Now it will return ENETDOWN, if device have just gone down,
	 *	but then it will block.
	 */

	skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);

	/*
	 *	An error occurred so return it. Because skb_recv_datagram() 
	 *	handles the blocking we don't see and worry about blocking
	 *	retries.
	 */

	if(skb==NULL)
		goto out;

	/*
	 *	You lose any data beyond the buffer you gave. If it worries a
	 *	user program they can ask the device for its MTU anyway.
	 */

	copied = skb->len;
	if (copied > len)
	{
		copied=len;
		msg->msg_flags|=MSG_TRUNC;
	}

	/* We can't use skb_copy_datagram here */
	err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
	if (err)
		goto out_free;
	skb_get_timestamp(skb, &sk->sk_stamp);

	if (msg->msg_name)
		memcpy(msg->msg_name, skb->cb, msg->msg_namelen);

	/*
	 *	Free or return the buffer as appropriate. Again this
	 *	hides all the races and re-entrancy issues from us.
	 */
	err = copied;

out_free:
	skb_free_datagram(sk, skb);
out:
	return err;
}

/*
 *	Bind an Econet socket.
 */

static int econet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
	struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
	struct sock *sk=sock->sk;
	struct econet_sock *eo = ec_sk(sk);
	
	/*
	 *	Check legality
	 */
	 
	if (addr_len < sizeof(struct sockaddr_ec) ||
	    sec->sec_family != AF_ECONET)
		return -EINVAL;
	
	eo->cb	    = sec->cb;
	eo->port    = sec->port;
	eo->station = sec->addr.station;
	eo->net	    = sec->addr.net;

	return 0;
}

#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
/*
 *	Queue a transmit result for the user to be told about.
 */

static void tx_result(struct sock *sk, unsigned long cookie, int result)
{
	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
	struct ec_cb *eb;
	struct sockaddr_ec *sec;

	if (skb == NULL)
	{
		printk(KERN_DEBUG "ec: memory squeeze, transmit result dropped.\n");
		return;
	}

	eb = (struct ec_cb *)&skb->cb;
	sec = (struct sockaddr_ec *)&eb->sec;
	memset(sec, 0, sizeof(struct sockaddr_ec));
	sec->cookie = cookie;
	sec->type = ECTYPE_TRANSMIT_STATUS | result;
	sec->sec_family = AF_ECONET;

	if (sock_queue_rcv_skb(sk, skb) < 0)
		kfree_skb(skb);
}
#endif

#ifdef CONFIG_ECONET_NATIVE
/*
 *	Called by the Econet hardware driver when a packet transmit
 *	has completed.  Tell the user.
 */

static void ec_tx_done(struct sk_buff *skb, int result)
{
	struct ec_cb *eb = (struct ec_cb *)&skb->cb;
	tx_result(skb->sk, eb->cookie, result);
}
#endif

/*
 *	Send a packet.  We have to work out which device it's going out on
 *	and hence whether to use real Econet or the UDP emulation.
 */

static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
			  struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct sockaddr_ec *saddr=(struct sockaddr_ec *)msg->msg_name;
	struct net_device *dev;
	struct ec_addr addr;
	int err;
	unsigned char port, cb;
#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
	struct sk_buff *skb;
	struct ec_cb *eb;
#endif
#ifdef CONFIG_ECONET_AUNUDP
	struct msghdr udpmsg;
	struct iovec iov[msg->msg_iovlen+1];
	struct aunhdr ah;
	struct sockaddr_in udpdest;
	__kernel_size_t size;
	int i;
	mm_segment_t oldfs;
#endif
		
	/*
	 *	Check the flags. 
	 */

	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) 
		return -EINVAL;

	/*
	 *	Get and verify the address. 
	 */
	 
	if (saddr == NULL) {
		struct econet_sock *eo = ec_sk(sk);

		addr.station = eo->station;
		addr.net     = eo->net;
		port	     = eo->port;
		cb	     = eo->cb;
	} else {
		if (msg->msg_namelen < sizeof(struct sockaddr_ec)) 
			return -EINVAL;
		addr.station = saddr->addr.station;
		addr.net = saddr->addr.net;
		port = saddr->port;
		cb = saddr->cb;
	}

	/* Look for a device with the right network number. */
	dev = net2dev_map[addr.net];

	/* If not directly reachable, use some default */
	if (dev == NULL)
	{
		dev = net2dev_map[0];
		/* No interfaces at all? */
		if (dev == NULL)
			return -ENETDOWN;
	}

	if (len + 15 > dev->mtu)
		return -EMSGSIZE;

	if (dev->type == ARPHRD_ECONET)
	{
		/* Real hardware Econet.  We're not worthy etc. */
#ifdef CONFIG_ECONET_NATIVE
		unsigned short proto = 0;

		dev_hold(dev);
		
		skb = sock_alloc_send_skb(sk, len+LL_RESERVED_SPACE(dev), 
					  msg->msg_flags & MSG_DONTWAIT, &err);
		if (skb==NULL)
			goto out_unlock;
		
		skb_reserve(skb, LL_RESERVED_SPACE(dev));
		skb->nh.raw = skb->data;
		
		eb = (struct ec_cb *)&skb->cb;
		
		/* BUG: saddr may be NULL */
		eb->cookie = saddr->cookie;
		eb->sec = *saddr;
		eb->sent = ec_tx_done;

		if (dev->hard_header) {
			int res;
			struct ec_framehdr *fh;
			err = -EINVAL;
			res = dev->hard_header(skb, dev, ntohs(proto), 
					       &addr, NULL, len);
			/* Poke in our control byte and
			   port number.  Hack, hack.  */
			fh = (struct ec_framehdr *)(skb->data);
			fh->cb = cb;
			fh->port = port;
			if (sock->type != SOCK_DGRAM) {
				skb->tail = skb->data;
				skb->len = 0;
			} else if (res < 0)
				goto out_free;
		}
		
		/* Copy the data. Returns -EFAULT on error */
		err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
		skb->protocol = proto;
		skb->dev = dev;
		skb->priority = sk->sk_priority;
		if (err)
			goto out_free;
		
		err = -ENETDOWN;
		if (!(dev->flags & IFF_UP))
			goto out_free;
		
		/*
		 *	Now send it
		 */
		
		dev_queue_xmit(skb);
		dev_put(dev);
		return(len);

	out_free:
		kfree_skb(skb);
	out_unlock:
		if (dev)
			dev_put(dev);
#else
		err = -EPROTOTYPE;
#endif
		return err;
	}

#ifdef CONFIG_ECONET_AUNUDP
	/* AUN virtual Econet. */

	if (udpsock == NULL)
		return -ENETDOWN;		/* No socket - can't send */
	
	/* Make up a UDP datagram and hand it off to some higher intellect. */

	memset(&udpdest, 0, sizeof(udpdest));
	udpdest.sin_family = AF_INET;
	udpdest.sin_port = htons(AUN_PORT);

	/* At the moment we use the stupid Acorn scheme of Econet address
	   y.x maps to IP a.b.c.x.  This should be replaced with something
	   more flexible and more aware of subnet masks.  */
	{
		struct in_device *idev;
		unsigned long network = 0;

		rcu_read_lock();
		idev = __in_dev_get_rcu(dev);
		if (idev) {
			if (idev->ifa_list)
				network = ntohl(idev->ifa_list->ifa_address) & 
					0xffffff00;		/* !!! */
		}
		rcu_read_unlock();
		udpdest.sin_addr.s_addr = htonl(network | addr.station);
	}

	ah.port = port;
	ah.cb = cb & 0x7f;
	ah.code = 2;		/* magic */
	ah.pad = 0;

	/* tack our header on the front of the iovec */
	size = sizeof(struct aunhdr);
	/*
	 * XXX: that is b0rken.  We can't mix userland and kernel pointers
	 * in iovec, since on a lot of platforms copy_from_user() will
	 * *not* work with the kernel and userland ones at the same time,
	 * regardless of what we do with set_fs().  And we are talking about
	 * econet-over-ethernet here, so "it's only ARM anyway" doesn't
	 * apply.  Any suggestions on fixing that code?		-- AV
	 */
	iov[0].iov_base = (void *)&ah;
	iov[0].iov_len = size;
	for (i = 0; i < msg->msg_iovlen; i++) {
		void __user *base = msg->msg_iov[i].iov_base;
		size_t len = msg->msg_iov[i].iov_len;
		/* Check it now since we switch to KERNEL_DS later. */
		if (!access_ok(VERIFY_READ, base, len))
			return -EFAULT;
		iov[i+1].iov_base = base;
		iov[i+1].iov_len = len;
		size += len;
	}

	/* Get a skbuff (no data, just holds our cb information) */
	if ((skb = sock_alloc_send_skb(sk, 0, 
			     msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
		return err;

	eb = (struct ec_cb *)&skb->cb;

	eb->cookie = saddr->cookie;
	eb->timeout = (5*HZ);
	eb->start = jiffies;
	ah.handle = aun_seq;
	eb->seq = (aun_seq++);
	eb->sec = *saddr;

	skb_queue_tail(&aun_queue, skb);

	udpmsg.msg_name = (void *)&udpdest;
	udpmsg.msg_namelen = sizeof(udpdest);
	udpmsg.msg_iov = &iov[0];
	udpmsg.msg_iovlen = msg->msg_iovlen + 1;
	udpmsg.msg_control = NULL;
	udpmsg.msg_controllen = 0;
	udpmsg.msg_flags=0;

	oldfs = get_fs(); set_fs(KERNEL_DS);	/* More privs :-) */
	err = sock_sendmsg(udpsock, &udpmsg, size);
	set_fs(oldfs);
#else
	err = -EPROTOTYPE;
#endif
	return err;
}

/*
 *	Look up the address of a socket.
 */

static int econet_getname(struct socket *sock, struct sockaddr *uaddr,
			  int *uaddr_len, int peer)
{
	struct sock *sk = sock->sk;
	struct econet_sock *eo = ec_sk(sk);
	struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;

	if (peer)
		return -EOPNOTSUPP;

	sec->sec_family	  = AF_ECONET;
	sec->port	  = eo->port;
	sec->addr.station = eo->station;
	sec->addr.net	  = eo->net;

	*uaddr_len = sizeof(*sec);
	return 0;
}

static void econet_destroy_timer(unsigned long data)
{
	struct sock *sk=(struct sock *)data;

	if (!atomic_read(&sk->sk_wmem_alloc) &&
	    !atomic_read(&sk->sk_rmem_alloc)) {
		sk_free(sk);
		return;
	}

	sk->sk_timer.expires = jiffies + 10 * HZ;
	add_timer(&sk->sk_timer);
	printk(KERN_DEBUG "econet socket destroy delayed\n");
}

/*
 *	Close an econet socket.
 */

static int econet_release(struct socket *sock)
{
	struct sock *sk = sock->sk;

	if (!sk)
		return 0;

	econet_remove_socket(&econet_sklist, sk);

	/*
	 *	Now the socket is dead. No more input will appear.
	 */

	sk->sk_state_change(sk);	/* It is useless. Just for sanity. */

	sock->sk = NULL;
	sk->sk_socket = NULL;
	sock_set_flag(sk, SOCK_DEAD);

	/* Purge queues */

	skb_queue_purge(&sk->sk_receive_queue);

	if (atomic_read(&sk->sk_rmem_alloc) ||
	    atomic_read(&sk->sk_wmem_alloc)) {
		sk->sk_timer.data     = (unsigned long)sk;
		sk->sk_timer.expires  = jiffies + HZ;
		sk->sk_timer.function = econet_destroy_timer;
		add_timer(&sk->sk_timer);
		return 0;
	}

	sk_free(sk);
	return 0;
}

static struct proto econet_proto = {
	.name	  = "ECONET",
	.owner	  = THIS_MODULE,
	.obj_size = sizeof(struct econet_sock),
};

/*
 *	Create an Econet socket
 */

static int econet_create(struct socket *sock, int protocol)
{
	struct sock *sk;
	struct econet_sock *eo;
	int err;

	/* Econet only provides datagram services. */
	if (sock->type != SOCK_DGRAM)
		return -ESOCKTNOSUPPORT;

	sock->state = SS_UNCONNECTED;

	err = -ENOBUFS;
	sk = sk_alloc(PF_ECONET, GFP_KERNEL, &econet_proto, 1);
	if (sk == NULL)
		goto out;

	sk->sk_reuse = 1;
	sock->ops = &econet_ops;
	sock_init_data(sock, sk);

	eo = ec_sk(sk);
	sock_reset_flag(sk, SOCK_ZAPPED);
	sk->sk_family = PF_ECONET;
	eo->num = protocol;

	econet_insert_socket(&econet_sklist, sk);
	return(0);
out:
	return err;
}

/*
 *	Handle Econet specific ioctls
 */

static int ec_dev_ioctl(struct socket *sock, unsigned int cmd, void __user *arg)
{
	struct ifreq ifr;
	struct ec_device *edev;
	struct net_device *dev;
	struct sockaddr_ec *sec;

	/*
	 *	Fetch the caller's info block into kernel space
	 */

	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
		return -EFAULT;

	if ((dev = dev_get_by_name(ifr.ifr_name)) == NULL) 
		return -ENODEV;

	sec = (struct sockaddr_ec *)&ifr.ifr_addr;

	switch (cmd)
	{
	case SIOCSIFADDR:
		edev = dev->ec_ptr;
		if (edev == NULL)
		{
			/* Magic up a new one. */
			edev = kmalloc(sizeof(struct ec_device), GFP_KERNEL);
			if (edev == NULL) {
				printk("af_ec: memory squeeze.\n");
				dev_put(dev);
				return -ENOMEM;
			}
			memset(edev, 0, sizeof(struct ec_device));
			dev->ec_ptr = edev;
		}
		else
			net2dev_map[edev->net] = NULL;
		edev->station = sec->addr.station;
		edev->net = sec->addr.net;
		net2dev_map[sec->addr.net] = dev;
		if (!net2dev_map[0])
			net2dev_map[0] = dev;
		dev_put(dev);
		return 0;

	case SIOCGIFADDR:
		edev = dev->ec_ptr;
		if (edev == NULL)
		{
			dev_put(dev);
			return -ENODEV;
		}
		memset(sec, 0, sizeof(struct sockaddr_ec));
		sec->addr.station = edev->station;
		sec->addr.net = edev->net;
		sec->sec_family = AF_ECONET;
		dev_put(dev);
		if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
			return -EFAULT;
		return 0;
	}

	dev_put(dev);
	return -EINVAL;
}

/*
 *	Handle generic ioctls
 */

static int econet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	struct sock *sk = sock->sk;
	void __user *argp = (void __user *)arg;

	switch(cmd) {
		case SIOCGSTAMP:
			return sock_get_timestamp(sk, argp);

		case SIOCSIFADDR:
		case SIOCGIFADDR:
			return ec_dev_ioctl(sock, cmd, argp);
			break;

		default:
			return dev_ioctl(cmd, argp);
	}
	/*NOTREACHED*/
	return 0;
}

static struct net_proto_family econet_family_ops = {
	.family =	PF_ECONET,
	.create =	econet_create,
	.owner	=	THIS_MODULE,
};

static const struct proto_ops SOCKOPS_WRAPPED(econet_ops) = {
	.family =	PF_ECONET,
	.owner =	THIS_MODULE,
	.release =	econet_release,
	.bind =		econet_bind,
	.connect =	sock_no_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
	.getname =	econet_getname, 
	.poll =		datagram_poll,
	.ioctl =	econet_ioctl,
	.listen =	sock_no_listen,
	.shutdown =	sock_no_shutdown,
	.setsockopt =	sock_no_setsockopt,
	.getsockopt =	sock_no_getsockopt,
	.sendmsg =	econet_sendmsg,
	.recvmsg =	econet_recvmsg,
	.mmap =		sock_no_mmap,
	.sendpage =	sock_no_sendpage,
};

#include <linux/smp_lock.h>
SOCKOPS_WRAP(econet, PF_ECONET);

#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
/*
 *	Find the listening socket, if any, for the given data.
 */

static struct sock *ec_listening_socket(unsigned char port, unsigned char
				 station, unsigned char net)
{
	struct sock *sk;
	struct hlist_node *node;

	sk_for_each(sk, node, &econet_sklist) {
		struct econet_sock *opt = ec_sk(sk);
		if ((opt->port == port || opt->port == 0) && 
		    (opt->station == station || opt->station == 0) &&
		    (opt->net == net || opt->net == 0))
			goto found;
	}
	sk = NULL;
found:
	return sk;
}

/*
 *	Queue a received packet for a socket.
 */

static int ec_queue_packet(struct sock *sk, struct sk_buff *skb,
			   unsigned char stn, unsigned char net,
			   unsigned char cb, unsigned char port)
{
	struct ec_cb *eb = (struct ec_cb *)&skb->cb;
	struct sockaddr_ec *sec = (struct sockaddr_ec *)&eb->sec;

	memset(sec, 0, sizeof(struct sockaddr_ec));
	sec->sec_family = AF_ECONET;
	sec->type = ECTYPE_PACKET_RECEIVED;
	sec->port = port;
	sec->cb = cb;
	sec->addr.net = net;
	sec->addr.station = stn;

	return sock_queue_rcv_skb(sk, skb);
}
#endif

#ifdef CONFIG_ECONET_AUNUDP
/*
 *	Send an AUN protocol response. 
 */

static void aun_send_response(__u32 addr, unsigned long seq, int code, int cb)
{
	struct sockaddr_in sin = {
		.sin_family = AF_INET,
		.sin_port = htons(AUN_PORT),
		.sin_addr = {.s_addr = addr}
	};
	struct aunhdr ah = {.code = code, .cb = cb, .handle = seq};
	struct kvec iov = {.iov_base = (void *)&ah, .iov_len = sizeof(ah)};
	struct msghdr udpmsg;
	
	udpmsg.msg_name = (void *)&sin;
	udpmsg.msg_namelen = sizeof(sin);
	udpmsg.msg_control = NULL;
	udpmsg.msg_controllen = 0;
	udpmsg.msg_flags=0;

	kernel_sendmsg(udpsock, &udpmsg, &iov, 1, sizeof(ah));
}


/*
 *	Handle incoming AUN packets.  Work out if anybody wants them,
 *	and send positive or negative acknowledgements as appropriate.
 */

static void aun_incoming(struct sk_buff *skb, struct aunhdr *ah, size_t len)
{
	struct iphdr *ip = skb->nh.iph;
	unsigned char stn = ntohl(ip->saddr) & 0xff;
	struct sock *sk;
	struct sk_buff *newskb;
	struct ec_device *edev = skb->dev->ec_ptr;

	if (! edev)
		goto bad;

	if ((sk = ec_listening_socket(ah->port, stn, edev->net)) == NULL)
		goto bad;		/* Nobody wants it */

	newskb = alloc_skb((len - sizeof(struct aunhdr) + 15) & ~15, 
			   GFP_ATOMIC);
	if (newskb == NULL)
	{
		printk(KERN_DEBUG "AUN: memory squeeze, dropping packet.\n");
		/* Send nack and hope sender tries again */
		goto bad;
	}

	memcpy(skb_put(newskb, len - sizeof(struct aunhdr)), (void *)(ah+1), 
	       len - sizeof(struct aunhdr));

	if (ec_queue_packet(sk, newskb, stn, edev->net, ah->cb, ah->port))
	{
		/* Socket is bankrupt. */
		kfree_skb(newskb);
		goto bad;
	}

	aun_send_response(ip->saddr, ah->handle, 3, 0);
	return;

bad:
	aun_send_response(ip->saddr, ah->handle, 4, 0);
}

/*
 *	Handle incoming AUN transmit acknowledgements.  If the sequence
 *      number matches something in our backlog then kill it and tell
 *	the user.  If the remote took too long to reply then we may have
 *	dropped the packet already.
 */

static void aun_tx_ack(unsigned long seq, int result)
{
	struct sk_buff *skb;
	unsigned long flags;
	struct ec_cb *eb;

	spin_lock_irqsave(&aun_queue_lock, flags);
	skb = skb_peek(&aun_queue);
	while (skb && skb != (struct sk_buff *)&aun_queue)
	{
		struct sk_buff *newskb = skb->next;
		eb = (struct ec_cb *)&skb->cb;
		if (eb->seq == seq)
			goto foundit;

		skb = newskb;
	}
	spin_unlock_irqrestore(&aun_queue_lock, flags);
	printk(KERN_DEBUG "AUN: unknown sequence %ld\n", seq);
	return;

foundit:
	tx_result(skb->sk, eb->cookie, result);
	skb_unlink(skb, &aun_queue);
	spin_unlock_irqrestore(&aun_queue_lock, flags);
	kfree_skb(skb);
}

/*
 *	Deal with received AUN frames - sort out what type of thing it is
 *	and hand it to the right function.
 */

static void aun_data_available(struct sock *sk, int slen)
{
	int err;
	struct sk_buff *skb;
	unsigned char *data;
	struct aunhdr *ah;
	struct iphdr *ip;
	size_t len;

	while ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) {
		if (err == -EAGAIN) {
			printk(KERN_ERR "AUN: no data available?!");
			return;
		}
		printk(KERN_DEBUG "AUN: recvfrom() error %d\n", -err);
	}

	data = skb->h.raw + sizeof(struct udphdr);
	ah = (struct aunhdr *)data;
	len = skb->len - sizeof(struct udphdr);
	ip = skb->nh.iph;

	switch (ah->code)
	{
	case 2:
		aun_incoming(skb, ah, len);
		break;
	case 3:
		aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_OK);
		break;
	case 4:
		aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_NOT_LISTENING);
		break;
#if 0
		/* This isn't quite right yet. */
	case 5:
		aun_send_response(ip->saddr, ah->handle, 6, ah->cb);
		break;
#endif
	default:
		printk(KERN_DEBUG "unknown AUN packet (type %d)\n", data[0]);
	}

	skb_free_datagram(sk, skb);
}

/*
 *	Called by the timer to manage the AUN transmit queue.  If a packet
 *	was sent to a dead or nonexistent host then we will never get an
 *	acknowledgement back.  After a few seconds we need to spot this and
 *	drop the packet.
 */

static void ab_cleanup(unsigned long h)
{
	struct sk_buff *skb;
	unsigned long flags;

	spin_lock_irqsave(&aun_queue_lock, flags);
	skb = skb_peek(&aun_queue);
	while (skb && skb != (struct sk_buff *)&aun_queue)
	{
		struct sk_buff *newskb = skb->next;
		struct ec_cb *eb = (struct ec_cb *)&skb->cb;
		if ((jiffies - eb->start) > eb->timeout)
		{
			tx_result(skb->sk, eb->cookie, 
				  ECTYPE_TRANSMIT_NOT_PRESENT);
			skb_unlink(skb, &aun_queue);
			kfree_skb(skb);
		}
		skb = newskb;
	}
	spin_unlock_irqrestore(&aun_queue_lock, flags);

	mod_timer(&ab_cleanup_timer, jiffies + (HZ*2));
}

static int __init aun_udp_initialise(void)
{
	int error;
	struct sockaddr_in sin;

	skb_queue_head_init(&aun_queue);
	spin_lock_init(&aun_queue_lock);
	init_timer(&ab_cleanup_timer);
	ab_cleanup_timer.expires = jiffies + (HZ*2);
	ab_cleanup_timer.function = ab_cleanup;
	add_timer(&ab_cleanup_timer);

	memset(&sin, 0, sizeof(sin));
	sin.sin_port = htons(AUN_PORT);

	/* We can count ourselves lucky Acorn machines are too dim to
	   speak IPv6. :-) */
	if ((error = sock_create_kern(PF_INET, SOCK_DGRAM, 0, &udpsock)) < 0)
	{
		printk("AUN: socket error %d\n", -error);
		return error;
	}
	
	udpsock->sk->sk_reuse = 1;
	udpsock->sk->sk_allocation = GFP_ATOMIC; /* we're going to call it
						    from interrupts */
	
	error = udpsock->ops->bind(udpsock, (struct sockaddr *)&sin,
				sizeof(sin));
	if (error < 0)
	{
		printk("AUN: bind error %d\n", -error);
		goto release;
	}

	udpsock->sk->sk_data_ready = aun_data_available;

	return 0;

release:
	sock_release(udpsock);
	udpsock = NULL;
	return error;
}
#endif

#ifdef CONFIG_ECONET_NATIVE

/*
 *	Receive an Econet frame from a device.
 */

static int econet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
	struct ec_framehdr *hdr;
	struct sock *sk;
	struct ec_device *edev = dev->ec_ptr;

	if (skb->pkt_type == PACKET_OTHERHOST)
		goto drop;

	if (!edev)
		goto drop;

	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
		return NET_RX_DROP;

	if (!pskb_may_pull(skb, sizeof(struct ec_framehdr)))
		goto drop;

	hdr = (struct ec_framehdr *) skb->data;

	/* First check for encapsulated IP */
	if (hdr->port == EC_PORT_IP) {
		skb->protocol = htons(ETH_P_IP);
		skb_pull(skb, sizeof(struct ec_framehdr));
		netif_rx(skb);
		return 0;
	}

	sk = ec_listening_socket(hdr->port, hdr->src_stn, hdr->src_net);
	if (!sk)
		goto drop;

	if (ec_queue_packet(sk, skb, edev->net, hdr->src_stn, hdr->cb,
			    hdr->port))
		goto drop;

	return 0;

drop:
	kfree_skb(skb);
	return NET_RX_DROP;
}

static struct packet_type econet_packet_type = {
	.type =		__constant_htons(ETH_P_ECONET),
	.func =		econet_rcv,
};

static void econet_hw_initialise(void)
{
	dev_add_pack(&econet_packet_type);
}

#endif

static int econet_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
	struct net_device *dev = (struct net_device *)data;
	struct ec_device *edev;

	switch (msg) {
	case NETDEV_UNREGISTER:
		/* A device has gone down - kill any data we hold for it. */
		edev = dev->ec_ptr;
		if (edev)
		{
			if (net2dev_map[0] == dev)
				net2dev_map[0] = NULL;
			net2dev_map[edev->net] = NULL;
			kfree(edev);
			dev->ec_ptr = NULL;
		}
		break;
	}

	return NOTIFY_DONE;
}

static struct notifier_block econet_netdev_notifier = {
	.notifier_call =econet_notifier,
};

static void __exit econet_proto_exit(void)
{
#ifdef CONFIG_ECONET_AUNUDP
	del_timer(&ab_cleanup_timer);
	if (udpsock)
		sock_release(udpsock);
#endif
	unregister_netdevice_notifier(&econet_netdev_notifier);
	sock_unregister(econet_family_ops.family);
	proto_unregister(&econet_proto);
}

static int __init econet_proto_init(void)
{
	int err = proto_register(&econet_proto, 0);

	if (err != 0)
		goto out;
	sock_register(&econet_family_ops);
#ifdef CONFIG_ECONET_AUNUDP
	spin_lock_init(&aun_queue_lock);
	aun_udp_initialise();
#endif
#ifdef CONFIG_ECONET_NATIVE
	econet_hw_initialise();
#endif
	register_netdevice_notifier(&econet_netdev_notifier);
out:
	return err;
}

module_init(econet_proto_init);
module_exit(econet_proto_exit);

MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_ECONET);