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23#include <linux/compiler.h>
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/rtnetlink.h>
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <net/llc.h>
30#include <net/llc_sap.h>
31#include <net/llc_pdu.h>
32#include <net/llc_conn.h>
33#include <net/tcp_states.h>
34
35
36static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
37static u16 llc_ui_sap_link_no_max[256];
38static struct sockaddr_llc llc_ui_addrnull;
39static const struct proto_ops llc_ui_ops;
40
41static int llc_ui_wait_for_conn(struct sock *sk, long timeout);
42static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
43static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
44
45#if 0
46#define dprintk(args...) printk(KERN_DEBUG args)
47#else
48#define dprintk(args...)
49#endif
50
51
52#define LLC_CMSG_PKTINFO 1
53
54
55
56
57
58
59
60
61static inline u16 llc_ui_next_link_no(int sap)
62{
63 return llc_ui_sap_link_no_max[sap]++;
64}
65
66
67
68
69
70
71
72static inline __be16 llc_proto_type(u16 arphrd)
73{
74 return htons(ETH_P_802_2);
75}
76
77
78
79
80
81static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
82{
83 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
84}
85
86
87
88
89
90
91
92
93
94
95static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
96{
97 u8 rc = LLC_PDU_LEN_U;
98
99 if (addr->sllc_test || addr->sllc_xid)
100 rc = LLC_PDU_LEN_U;
101 else if (sk->sk_type == SOCK_STREAM)
102 rc = LLC_PDU_LEN_I;
103 return rc;
104}
105
106
107
108
109
110
111
112
113
114
115static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
116{
117 struct llc_sock* llc = llc_sk(sk);
118 int rc = 0;
119
120 if (unlikely(llc_data_accept_state(llc->state) ||
121 llc->remote_busy_flag ||
122 llc->p_flag)) {
123 long timeout = sock_sndtimeo(sk, noblock);
124
125 rc = llc_ui_wait_for_busy_core(sk, timeout);
126 }
127 if (unlikely(!rc))
128 rc = llc_build_and_send_pkt(sk, skb);
129 return rc;
130}
131
132static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
133{
134 sock_graft(sk, sock);
135 sk->sk_type = sock->type;
136 sock->ops = &llc_ui_ops;
137}
138
139static struct proto llc_proto = {
140 .name = "LLC",
141 .owner = THIS_MODULE,
142 .obj_size = sizeof(struct llc_sock),
143 .slab_flags = SLAB_DESTROY_BY_RCU,
144};
145
146
147
148
149
150
151
152
153
154
155
156
157static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
158 int kern)
159{
160 struct sock *sk;
161 int rc = -ESOCKTNOSUPPORT;
162
163 if (!ns_capable(net->user_ns, CAP_NET_RAW))
164 return -EPERM;
165
166 if (!net_eq(net, &init_net))
167 return -EAFNOSUPPORT;
168
169 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
170 rc = -ENOMEM;
171 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto);
172 if (sk) {
173 rc = 0;
174 llc_ui_sk_init(sock, sk);
175 }
176 }
177 return rc;
178}
179
180
181
182
183
184
185
186static int llc_ui_release(struct socket *sock)
187{
188 struct sock *sk = sock->sk;
189 struct llc_sock *llc;
190
191 if (unlikely(sk == NULL))
192 goto out;
193 sock_hold(sk);
194 lock_sock(sk);
195 llc = llc_sk(sk);
196 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
197 llc->laddr.lsap, llc->daddr.lsap);
198 if (!llc_send_disc(sk))
199 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
200 if (!sock_flag(sk, SOCK_ZAPPED))
201 llc_sap_remove_socket(llc->sap, sk);
202 release_sock(sk);
203 if (llc->dev)
204 dev_put(llc->dev);
205 sock_put(sk);
206 llc_sk_free(sk);
207out:
208 return 0;
209}
210
211
212
213
214
215
216
217
218static int llc_ui_autoport(void)
219{
220 struct llc_sap *sap;
221 int i, tries = 0;
222
223 while (tries < LLC_SAP_DYN_TRIES) {
224 for (i = llc_ui_sap_last_autoport;
225 i < LLC_SAP_DYN_STOP; i += 2) {
226 sap = llc_sap_find(i);
227 if (!sap) {
228 llc_ui_sap_last_autoport = i + 2;
229 goto out;
230 }
231 llc_sap_put(sap);
232 }
233 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
234 tries++;
235 }
236 i = 0;
237out:
238 return i;
239}
240
241
242
243
244
245
246
247
248
249
250
251static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
252{
253 struct sock *sk = sock->sk;
254 struct llc_sock *llc = llc_sk(sk);
255 struct llc_sap *sap;
256 int rc = -EINVAL;
257
258 if (!sock_flag(sk, SOCK_ZAPPED))
259 goto out;
260 rc = -ENODEV;
261 if (sk->sk_bound_dev_if) {
262 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
263 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
264 dev_put(llc->dev);
265 llc->dev = NULL;
266 }
267 } else
268 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
269 if (!llc->dev)
270 goto out;
271 rc = -EUSERS;
272 llc->laddr.lsap = llc_ui_autoport();
273 if (!llc->laddr.lsap)
274 goto out;
275 rc = -EBUSY;
276 sap = llc_sap_open(llc->laddr.lsap, NULL);
277 if (!sap)
278 goto out;
279 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
280 memcpy(&llc->addr, addr, sizeof(llc->addr));
281
282 llc_sap_add_socket(sap, sk);
283 sock_reset_flag(sk, SOCK_ZAPPED);
284 rc = 0;
285out:
286 return rc;
287}
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
304{
305 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
306 struct sock *sk = sock->sk;
307 struct llc_sock *llc = llc_sk(sk);
308 struct llc_sap *sap;
309 int rc = -EINVAL;
310
311 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
312 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
313 goto out;
314 rc = -EAFNOSUPPORT;
315 if (unlikely(addr->sllc_family != AF_LLC))
316 goto out;
317 rc = -ENODEV;
318 rcu_read_lock();
319 if (sk->sk_bound_dev_if) {
320 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
321 if (llc->dev) {
322 if (!addr->sllc_arphrd)
323 addr->sllc_arphrd = llc->dev->type;
324 if (is_zero_ether_addr(addr->sllc_mac))
325 memcpy(addr->sllc_mac, llc->dev->dev_addr,
326 IFHWADDRLEN);
327 if (addr->sllc_arphrd != llc->dev->type ||
328 !ether_addr_equal(addr->sllc_mac,
329 llc->dev->dev_addr)) {
330 rc = -EINVAL;
331 llc->dev = NULL;
332 }
333 }
334 } else
335 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
336 addr->sllc_mac);
337 if (llc->dev)
338 dev_hold(llc->dev);
339 rcu_read_unlock();
340 if (!llc->dev)
341 goto out;
342 if (!addr->sllc_sap) {
343 rc = -EUSERS;
344 addr->sllc_sap = llc_ui_autoport();
345 if (!addr->sllc_sap)
346 goto out;
347 }
348 sap = llc_sap_find(addr->sllc_sap);
349 if (!sap) {
350 sap = llc_sap_open(addr->sllc_sap, NULL);
351 rc = -EBUSY;
352 if (!sap)
353 goto out;
354 } else {
355 struct llc_addr laddr, daddr;
356 struct sock *ask;
357
358 memset(&laddr, 0, sizeof(laddr));
359 memset(&daddr, 0, sizeof(daddr));
360
361
362
363
364 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
365 laddr.lsap = addr->sllc_sap;
366 rc = -EADDRINUSE;
367 ask = llc_lookup_established(sap, &daddr, &laddr);
368 if (ask) {
369 sock_put(ask);
370 goto out_put;
371 }
372 }
373 llc->laddr.lsap = addr->sllc_sap;
374 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
375 memcpy(&llc->addr, addr, sizeof(llc->addr));
376
377 llc_sap_add_socket(sap, sk);
378 sock_reset_flag(sk, SOCK_ZAPPED);
379 rc = 0;
380out_put:
381 llc_sap_put(sap);
382out:
383 return rc;
384}
385
386
387
388
389
390
391
392
393
394
395
396
397static int llc_ui_shutdown(struct socket *sock, int how)
398{
399 struct sock *sk = sock->sk;
400 int rc = -ENOTCONN;
401
402 lock_sock(sk);
403 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
404 goto out;
405 rc = -EINVAL;
406 if (how != 2)
407 goto out;
408 rc = llc_send_disc(sk);
409 if (!rc)
410 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
411
412 sk->sk_state_change(sk);
413out:
414 release_sock(sk);
415 return rc;
416}
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
433 int addrlen, int flags)
434{
435 struct sock *sk = sock->sk;
436 struct llc_sock *llc = llc_sk(sk);
437 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
438 int rc = -EINVAL;
439
440 lock_sock(sk);
441 if (unlikely(addrlen != sizeof(*addr)))
442 goto out;
443 rc = -EAFNOSUPPORT;
444 if (unlikely(addr->sllc_family != AF_LLC))
445 goto out;
446 if (unlikely(sk->sk_type != SOCK_STREAM))
447 goto out;
448 rc = -EALREADY;
449 if (unlikely(sock->state == SS_CONNECTING))
450 goto out;
451
452 if (sock_flag(sk, SOCK_ZAPPED)) {
453
454 rc = llc_ui_autobind(sock, addr);
455 if (rc)
456 goto out;
457 }
458 llc->daddr.lsap = addr->sllc_sap;
459 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
460 sock->state = SS_CONNECTING;
461 sk->sk_state = TCP_SYN_SENT;
462 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
463 rc = llc_establish_connection(sk, llc->dev->dev_addr,
464 addr->sllc_mac, addr->sllc_sap);
465 if (rc) {
466 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
467 sock->state = SS_UNCONNECTED;
468 sk->sk_state = TCP_CLOSE;
469 goto out;
470 }
471
472 if (sk->sk_state == TCP_SYN_SENT) {
473 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
474
475 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
476 goto out;
477
478 rc = sock_intr_errno(timeo);
479 if (signal_pending(current))
480 goto out;
481 }
482
483 if (sk->sk_state == TCP_CLOSE)
484 goto sock_error;
485
486 sock->state = SS_CONNECTED;
487 rc = 0;
488out:
489 release_sock(sk);
490 return rc;
491sock_error:
492 rc = sock_error(sk) ? : -ECONNABORTED;
493 sock->state = SS_UNCONNECTED;
494 goto out;
495}
496
497
498
499
500
501
502
503
504
505static int llc_ui_listen(struct socket *sock, int backlog)
506{
507 struct sock *sk = sock->sk;
508 int rc = -EINVAL;
509
510 lock_sock(sk);
511 if (unlikely(sock->state != SS_UNCONNECTED))
512 goto out;
513 rc = -EOPNOTSUPP;
514 if (unlikely(sk->sk_type != SOCK_STREAM))
515 goto out;
516 rc = -EAGAIN;
517 if (sock_flag(sk, SOCK_ZAPPED))
518 goto out;
519 rc = 0;
520 if (!(unsigned int)backlog)
521 backlog = 1;
522 sk->sk_max_ack_backlog = backlog;
523 if (sk->sk_state != TCP_LISTEN) {
524 sk->sk_ack_backlog = 0;
525 sk->sk_state = TCP_LISTEN;
526 }
527 sk->sk_socket->flags |= __SO_ACCEPTCON;
528out:
529 release_sock(sk);
530 return rc;
531}
532
533static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
534{
535 DEFINE_WAIT(wait);
536 int rc = 0;
537
538 while (1) {
539 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
540 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE))
541 break;
542 rc = -ERESTARTSYS;
543 if (signal_pending(current))
544 break;
545 rc = -EAGAIN;
546 if (!timeout)
547 break;
548 rc = 0;
549 }
550 finish_wait(sk_sleep(sk), &wait);
551 return rc;
552}
553
554static int llc_ui_wait_for_conn(struct sock *sk, long timeout)
555{
556 DEFINE_WAIT(wait);
557
558 while (1) {
559 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
560 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT))
561 break;
562 if (signal_pending(current) || !timeout)
563 break;
564 }
565 finish_wait(sk_sleep(sk), &wait);
566 return timeout;
567}
568
569static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
570{
571 DEFINE_WAIT(wait);
572 struct llc_sock *llc = llc_sk(sk);
573 int rc;
574
575 while (1) {
576 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
577 rc = 0;
578 if (sk_wait_event(sk, &timeout,
579 (sk->sk_shutdown & RCV_SHUTDOWN) ||
580 (!llc_data_accept_state(llc->state) &&
581 !llc->remote_busy_flag &&
582 !llc->p_flag)))
583 break;
584 rc = -ERESTARTSYS;
585 if (signal_pending(current))
586 break;
587 rc = -EAGAIN;
588 if (!timeout)
589 break;
590 }
591 finish_wait(sk_sleep(sk), &wait);
592 return rc;
593}
594
595static int llc_wait_data(struct sock *sk, long timeo)
596{
597 int rc;
598
599 while (1) {
600
601
602
603 rc = sock_error(sk);
604 if (rc)
605 break;
606 rc = 0;
607 if (sk->sk_shutdown & RCV_SHUTDOWN)
608 break;
609 rc = -EAGAIN;
610 if (!timeo)
611 break;
612 rc = sock_intr_errno(timeo);
613 if (signal_pending(current))
614 break;
615 rc = 0;
616 if (sk_wait_data(sk, &timeo))
617 break;
618 }
619 return rc;
620}
621
622static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
623{
624 struct llc_sock *llc = llc_sk(skb->sk);
625
626 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
627 struct llc_pktinfo info;
628
629 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
630 llc_pdu_decode_dsap(skb, &info.lpi_sap);
631 llc_pdu_decode_da(skb, info.lpi_mac);
632 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
633 }
634}
635
636
637
638
639
640
641
642
643
644
645static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
646{
647 struct sock *sk = sock->sk, *newsk;
648 struct llc_sock *llc, *newllc;
649 struct sk_buff *skb;
650 int rc = -EOPNOTSUPP;
651
652 dprintk("%s: accepting on %02X\n", __func__,
653 llc_sk(sk)->laddr.lsap);
654 lock_sock(sk);
655 if (unlikely(sk->sk_type != SOCK_STREAM))
656 goto out;
657 rc = -EINVAL;
658 if (unlikely(sock->state != SS_UNCONNECTED ||
659 sk->sk_state != TCP_LISTEN))
660 goto out;
661
662 if (skb_queue_empty(&sk->sk_receive_queue)) {
663 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
664 if (rc)
665 goto out;
666 }
667 dprintk("%s: got a new connection on %02X\n", __func__,
668 llc_sk(sk)->laddr.lsap);
669 skb = skb_dequeue(&sk->sk_receive_queue);
670 rc = -EINVAL;
671 if (!skb->sk)
672 goto frees;
673 rc = 0;
674 newsk = skb->sk;
675
676 llc_ui_sk_init(newsock, newsk);
677 sock_reset_flag(newsk, SOCK_ZAPPED);
678 newsk->sk_state = TCP_ESTABLISHED;
679 newsock->state = SS_CONNECTED;
680 llc = llc_sk(sk);
681 newllc = llc_sk(newsk);
682 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
683 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
684
685
686 sk->sk_state = TCP_LISTEN;
687 sk->sk_ack_backlog--;
688 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
689 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
690frees:
691 kfree_skb(skb);
692out:
693 release_sock(sk);
694 return rc;
695}
696
697
698
699
700
701
702
703
704
705
706
707static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
708 int flags)
709{
710 DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
711 const int nonblock = flags & MSG_DONTWAIT;
712 struct sk_buff *skb = NULL;
713 struct sock *sk = sock->sk;
714 struct llc_sock *llc = llc_sk(sk);
715 unsigned long cpu_flags;
716 size_t copied = 0;
717 u32 peek_seq = 0;
718 u32 *seq, skb_len;
719 unsigned long used;
720 int target;
721 long timeo;
722
723 lock_sock(sk);
724 copied = -ENOTCONN;
725 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
726 goto out;
727
728 timeo = sock_rcvtimeo(sk, nonblock);
729
730 seq = &llc->copied_seq;
731 if (flags & MSG_PEEK) {
732 peek_seq = llc->copied_seq;
733 seq = &peek_seq;
734 }
735
736 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
737 copied = 0;
738
739 do {
740 u32 offset;
741
742
743
744
745
746
747 if (signal_pending(current)) {
748 if (copied)
749 break;
750 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
751 break;
752 }
753
754
755
756 skb = skb_peek(&sk->sk_receive_queue);
757 if (skb) {
758 offset = *seq;
759 goto found_ok_skb;
760 }
761
762
763 if (copied >= target && !sk->sk_backlog.tail)
764 break;
765
766 if (copied) {
767 if (sk->sk_err ||
768 sk->sk_state == TCP_CLOSE ||
769 (sk->sk_shutdown & RCV_SHUTDOWN) ||
770 !timeo ||
771 (flags & MSG_PEEK))
772 break;
773 } else {
774 if (sock_flag(sk, SOCK_DONE))
775 break;
776
777 if (sk->sk_err) {
778 copied = sock_error(sk);
779 break;
780 }
781 if (sk->sk_shutdown & RCV_SHUTDOWN)
782 break;
783
784 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
785 if (!sock_flag(sk, SOCK_DONE)) {
786
787
788
789
790 copied = -ENOTCONN;
791 break;
792 }
793 break;
794 }
795 if (!timeo) {
796 copied = -EAGAIN;
797 break;
798 }
799 }
800
801 if (copied >= target) {
802 release_sock(sk);
803 lock_sock(sk);
804 } else
805 sk_wait_data(sk, &timeo);
806
807 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
808 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
809 current->comm,
810 task_pid_nr(current));
811 peek_seq = llc->copied_seq;
812 }
813 continue;
814 found_ok_skb:
815 skb_len = skb->len;
816
817 used = skb->len - offset;
818 if (len < used)
819 used = len;
820
821 if (!(flags & MSG_TRUNC)) {
822 int rc = skb_copy_datagram_msg(skb, offset, msg, used);
823 if (rc) {
824
825 if (!copied)
826 copied = -EFAULT;
827 break;
828 }
829 }
830
831 *seq += used;
832 copied += used;
833 len -= used;
834
835
836 if (sk->sk_type != SOCK_STREAM)
837 goto copy_uaddr;
838
839 if (!(flags & MSG_PEEK)) {
840 spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
841 sk_eat_skb(sk, skb);
842 spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
843 *seq = 0;
844 }
845
846
847 if (used + offset < skb_len)
848 continue;
849 } while (len > 0);
850
851out:
852 release_sock(sk);
853 return copied;
854copy_uaddr:
855 if (uaddr != NULL && skb != NULL) {
856 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
857 msg->msg_namelen = sizeof(*uaddr);
858 }
859 if (llc_sk(sk)->cmsg_flags)
860 llc_cmsg_rcv(msg, skb);
861
862 if (!(flags & MSG_PEEK)) {
863 spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
864 sk_eat_skb(sk, skb);
865 spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
866 *seq = 0;
867 }
868
869 goto out;
870}
871
872
873
874
875
876
877
878
879
880
881static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
882{
883 struct sock *sk = sock->sk;
884 struct llc_sock *llc = llc_sk(sk);
885 DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
886 int flags = msg->msg_flags;
887 int noblock = flags & MSG_DONTWAIT;
888 struct sk_buff *skb;
889 size_t size = 0;
890 int rc = -EINVAL, copied = 0, hdrlen;
891
892 dprintk("%s: sending from %02X to %02X\n", __func__,
893 llc->laddr.lsap, llc->daddr.lsap);
894 lock_sock(sk);
895 if (addr) {
896 if (msg->msg_namelen < sizeof(*addr))
897 goto release;
898 } else {
899 if (llc_ui_addr_null(&llc->addr))
900 goto release;
901 addr = &llc->addr;
902 }
903
904 if (sock_flag(sk, SOCK_ZAPPED)) {
905
906 rc = llc_ui_autobind(sock, addr);
907 if (rc)
908 goto release;
909 }
910 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
911 size = hdrlen + len;
912 if (size > llc->dev->mtu)
913 size = llc->dev->mtu;
914 copied = size - hdrlen;
915 release_sock(sk);
916 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
917 lock_sock(sk);
918 if (!skb)
919 goto release;
920 skb->dev = llc->dev;
921 skb->protocol = llc_proto_type(addr->sllc_arphrd);
922 skb_reserve(skb, hdrlen);
923 rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
924 if (rc)
925 goto out;
926 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
927 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
928 addr->sllc_sap);
929 goto out;
930 }
931 if (addr->sllc_test) {
932 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
933 addr->sllc_sap);
934 goto out;
935 }
936 if (addr->sllc_xid) {
937 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
938 addr->sllc_sap);
939 goto out;
940 }
941 rc = -ENOPROTOOPT;
942 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
943 goto out;
944 rc = llc_ui_send_data(sk, skb, noblock);
945out:
946 if (rc) {
947 kfree_skb(skb);
948release:
949 dprintk("%s: failed sending from %02X to %02X: %d\n",
950 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
951 }
952 release_sock(sk);
953 return rc ? : copied;
954}
955
956
957
958
959
960
961
962
963
964
965static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
966 int *uaddrlen, int peer)
967{
968 struct sockaddr_llc sllc;
969 struct sock *sk = sock->sk;
970 struct llc_sock *llc = llc_sk(sk);
971 int rc = -EBADF;
972
973 memset(&sllc, 0, sizeof(sllc));
974 lock_sock(sk);
975 if (sock_flag(sk, SOCK_ZAPPED))
976 goto out;
977 *uaddrlen = sizeof(sllc);
978 if (peer) {
979 rc = -ENOTCONN;
980 if (sk->sk_state != TCP_ESTABLISHED)
981 goto out;
982 if(llc->dev)
983 sllc.sllc_arphrd = llc->dev->type;
984 sllc.sllc_sap = llc->daddr.lsap;
985 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
986 } else {
987 rc = -EINVAL;
988 if (!llc->sap)
989 goto out;
990 sllc.sllc_sap = llc->sap->laddr.lsap;
991
992 if (llc->dev) {
993 sllc.sllc_arphrd = llc->dev->type;
994 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
995 IFHWADDRLEN);
996 }
997 }
998 rc = 0;
999 sllc.sllc_family = AF_LLC;
1000 memcpy(uaddr, &sllc, sizeof(sllc));
1001out:
1002 release_sock(sk);
1003 return rc;
1004}
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1015 unsigned long arg)
1016{
1017 return -ENOIOCTLCMD;
1018}
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1031 char __user *optval, unsigned int optlen)
1032{
1033 struct sock *sk = sock->sk;
1034 struct llc_sock *llc = llc_sk(sk);
1035 unsigned int opt;
1036 int rc = -EINVAL;
1037
1038 lock_sock(sk);
1039 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1040 goto out;
1041 rc = get_user(opt, (int __user *)optval);
1042 if (rc)
1043 goto out;
1044 rc = -EINVAL;
1045 switch (optname) {
1046 case LLC_OPT_RETRY:
1047 if (opt > LLC_OPT_MAX_RETRY)
1048 goto out;
1049 llc->n2 = opt;
1050 break;
1051 case LLC_OPT_SIZE:
1052 if (opt > LLC_OPT_MAX_SIZE)
1053 goto out;
1054 llc->n1 = opt;
1055 break;
1056 case LLC_OPT_ACK_TMR_EXP:
1057 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1058 goto out;
1059 llc->ack_timer.expire = opt * HZ;
1060 break;
1061 case LLC_OPT_P_TMR_EXP:
1062 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1063 goto out;
1064 llc->pf_cycle_timer.expire = opt * HZ;
1065 break;
1066 case LLC_OPT_REJ_TMR_EXP:
1067 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1068 goto out;
1069 llc->rej_sent_timer.expire = opt * HZ;
1070 break;
1071 case LLC_OPT_BUSY_TMR_EXP:
1072 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1073 goto out;
1074 llc->busy_state_timer.expire = opt * HZ;
1075 break;
1076 case LLC_OPT_TX_WIN:
1077 if (opt > LLC_OPT_MAX_WIN)
1078 goto out;
1079 llc->k = opt;
1080 break;
1081 case LLC_OPT_RX_WIN:
1082 if (opt > LLC_OPT_MAX_WIN)
1083 goto out;
1084 llc->rw = opt;
1085 break;
1086 case LLC_OPT_PKTINFO:
1087 if (opt)
1088 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1089 else
1090 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1091 break;
1092 default:
1093 rc = -ENOPROTOOPT;
1094 goto out;
1095 }
1096 rc = 0;
1097out:
1098 release_sock(sk);
1099 return rc;
1100}
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1113 char __user *optval, int __user *optlen)
1114{
1115 struct sock *sk = sock->sk;
1116 struct llc_sock *llc = llc_sk(sk);
1117 int val = 0, len = 0, rc = -EINVAL;
1118
1119 lock_sock(sk);
1120 if (unlikely(level != SOL_LLC))
1121 goto out;
1122 rc = get_user(len, optlen);
1123 if (rc)
1124 goto out;
1125 rc = -EINVAL;
1126 if (len != sizeof(int))
1127 goto out;
1128 switch (optname) {
1129 case LLC_OPT_RETRY:
1130 val = llc->n2; break;
1131 case LLC_OPT_SIZE:
1132 val = llc->n1; break;
1133 case LLC_OPT_ACK_TMR_EXP:
1134 val = llc->ack_timer.expire / HZ; break;
1135 case LLC_OPT_P_TMR_EXP:
1136 val = llc->pf_cycle_timer.expire / HZ; break;
1137 case LLC_OPT_REJ_TMR_EXP:
1138 val = llc->rej_sent_timer.expire / HZ; break;
1139 case LLC_OPT_BUSY_TMR_EXP:
1140 val = llc->busy_state_timer.expire / HZ; break;
1141 case LLC_OPT_TX_WIN:
1142 val = llc->k; break;
1143 case LLC_OPT_RX_WIN:
1144 val = llc->rw; break;
1145 case LLC_OPT_PKTINFO:
1146 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1147 break;
1148 default:
1149 rc = -ENOPROTOOPT;
1150 goto out;
1151 }
1152 rc = 0;
1153 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1154 rc = -EFAULT;
1155out:
1156 release_sock(sk);
1157 return rc;
1158}
1159
1160static const struct net_proto_family llc_ui_family_ops = {
1161 .family = PF_LLC,
1162 .create = llc_ui_create,
1163 .owner = THIS_MODULE,
1164};
1165
1166static const struct proto_ops llc_ui_ops = {
1167 .family = PF_LLC,
1168 .owner = THIS_MODULE,
1169 .release = llc_ui_release,
1170 .bind = llc_ui_bind,
1171 .connect = llc_ui_connect,
1172 .socketpair = sock_no_socketpair,
1173 .accept = llc_ui_accept,
1174 .getname = llc_ui_getname,
1175 .poll = datagram_poll,
1176 .ioctl = llc_ui_ioctl,
1177 .listen = llc_ui_listen,
1178 .shutdown = llc_ui_shutdown,
1179 .setsockopt = llc_ui_setsockopt,
1180 .getsockopt = llc_ui_getsockopt,
1181 .sendmsg = llc_ui_sendmsg,
1182 .recvmsg = llc_ui_recvmsg,
1183 .mmap = sock_no_mmap,
1184 .sendpage = sock_no_sendpage,
1185};
1186
1187static const char llc_proc_err_msg[] __initconst =
1188 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1189static const char llc_sysctl_err_msg[] __initconst =
1190 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1191static const char llc_sock_err_msg[] __initconst =
1192 KERN_CRIT "LLC: Unable to register the network family\n";
1193
1194static int __init llc2_init(void)
1195{
1196 int rc = proto_register(&llc_proto, 0);
1197
1198 if (rc != 0)
1199 goto out;
1200
1201 llc_build_offset_table();
1202 llc_station_init();
1203 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1204 rc = llc_proc_init();
1205 if (rc != 0) {
1206 printk(llc_proc_err_msg);
1207 goto out_station;
1208 }
1209 rc = llc_sysctl_init();
1210 if (rc) {
1211 printk(llc_sysctl_err_msg);
1212 goto out_proc;
1213 }
1214 rc = sock_register(&llc_ui_family_ops);
1215 if (rc) {
1216 printk(llc_sock_err_msg);
1217 goto out_sysctl;
1218 }
1219 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1220 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1221out:
1222 return rc;
1223out_sysctl:
1224 llc_sysctl_exit();
1225out_proc:
1226 llc_proc_exit();
1227out_station:
1228 llc_station_exit();
1229 proto_unregister(&llc_proto);
1230 goto out;
1231}
1232
1233static void __exit llc2_exit(void)
1234{
1235 llc_station_exit();
1236 llc_remove_pack(LLC_DEST_SAP);
1237 llc_remove_pack(LLC_DEST_CONN);
1238 sock_unregister(PF_LLC);
1239 llc_proc_exit();
1240 llc_sysctl_exit();
1241 proto_unregister(&llc_proto);
1242}
1243
1244module_init(llc2_init);
1245module_exit(llc2_exit);
1246
1247MODULE_LICENSE("GPL");
1248MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1249MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1250MODULE_ALIAS_NETPROTO(PF_LLC);
1251