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Merge tag 'powerpc-4.0-4' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux
[mirror_ubuntu-hirsute-kernel.git] / net / iucv / af_iucv.c
1 /*
2 * IUCV protocol stack for Linux on zSeries
3 *
4 * Copyright IBM Corp. 2006, 2009
5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
25 #include <net/sock.h>
26 #include <asm/ebcdic.h>
27 #include <asm/cpcmd.h>
28 #include <linux/kmod.h>
29
30 #include <net/iucv/af_iucv.h>
31
32 #define VERSION "1.2"
33
34 static char iucv_userid[80];
35
36 static const struct proto_ops iucv_sock_ops;
37
38 static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42 };
43
44 static struct iucv_interface *pr_iucv;
45
46 /* special AF_IUCV IPRM messages */
47 static const u8 iprm_shutdown[8] =
48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
49
50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
51
52 #define __iucv_sock_wait(sk, condition, timeo, ret) \
53 do { \
54 DEFINE_WAIT(__wait); \
55 long __timeo = timeo; \
56 ret = 0; \
57 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
58 while (!(condition)) { \
59 if (!__timeo) { \
60 ret = -EAGAIN; \
61 break; \
62 } \
63 if (signal_pending(current)) { \
64 ret = sock_intr_errno(__timeo); \
65 break; \
66 } \
67 release_sock(sk); \
68 __timeo = schedule_timeout(__timeo); \
69 lock_sock(sk); \
70 ret = sock_error(sk); \
71 if (ret) \
72 break; \
73 } \
74 finish_wait(sk_sleep(sk), &__wait); \
75 } while (0)
76
77 #define iucv_sock_wait(sk, condition, timeo) \
78 ({ \
79 int __ret = 0; \
80 if (!(condition)) \
81 __iucv_sock_wait(sk, condition, timeo, __ret); \
82 __ret; \
83 })
84
85 static void iucv_sock_kill(struct sock *sk);
86 static void iucv_sock_close(struct sock *sk);
87 static void iucv_sever_path(struct sock *, int);
88
89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
90 struct packet_type *pt, struct net_device *orig_dev);
91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
92 struct sk_buff *skb, u8 flags);
93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
94
95 /* Call Back functions */
96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
99 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
100 u8 ipuser[16]);
101 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
103
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
107 };
108
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
116 };
117
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120 memcpy(dst, src, 8);
121 }
122
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(&dst[8], src, 8);
126 }
127
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133 return 0;
134 }
135
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142
143 /**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151 struct iucv_sock *iucv;
152 struct sock *sk;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 switch (sk->sk_state) {
162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
165 iucv_sever_path(sk, 0);
166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179 }
180
181 /**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189 struct sock *sk;
190
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213 }
214
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221 };
222
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
226 .bus = NULL,
227 .pm = &afiucv_pm_ops,
228 };
229
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232
233 /**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
245 * The socket data length is computed by subtracting the socket data length
246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262 }
263
264 /**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274 return (sk->sk_state == state || sk->sk_state == state2);
275 }
276
277 /**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
296 }
297
298 /**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
307 if (wq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310 rcu_read_unlock();
311 }
312
313 /**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318 {
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
341 if (confirm_recv)
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 }
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 if (imsg)
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354
355 skb->dev = iucv->hs_dev;
356 if (!skb->dev)
357 return -ENODEV;
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
359 return -ENETDOWN;
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
362 return -EMSGSIZE;
363 else
364 skb_trim(skb, skb->dev->mtu);
365 }
366 skb->protocol = ETH_P_AF_IUCV;
367 nskb = skb_clone(skb, GFP_ATOMIC);
368 if (!nskb)
369 return -ENOMEM;
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
372 if (net_xmit_eval(err)) {
373 skb_unlink(nskb, &iucv->send_skb_q);
374 kfree_skb(nskb);
375 } else {
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 }
379 return net_xmit_eval(err);
380 }
381
382 static struct sock *__iucv_get_sock_by_name(char *nm)
383 {
384 struct sock *sk;
385
386 sk_for_each(sk, &iucv_sk_list.head)
387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
388 return sk;
389
390 return NULL;
391 }
392
393 static void iucv_sock_destruct(struct sock *sk)
394 {
395 skb_queue_purge(&sk->sk_receive_queue);
396 skb_queue_purge(&sk->sk_error_queue);
397
398 sk_mem_reclaim(sk);
399
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
402 return;
403 }
404
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
409 }
410
411 /* Cleanup Listen */
412 static void iucv_sock_cleanup_listen(struct sock *parent)
413 {
414 struct sock *sk;
415
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
418 iucv_sock_close(sk);
419 iucv_sock_kill(sk);
420 }
421
422 parent->sk_state = IUCV_CLOSED;
423 }
424
425 /* Kill socket (only if zapped and orphaned) */
426 static void iucv_sock_kill(struct sock *sk)
427 {
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
429 return;
430
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
433 sock_put(sk);
434 }
435
436 /* Terminate an IUCV path */
437 static void iucv_sever_path(struct sock *sk, int with_user_data)
438 {
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
442
443 if (iucv->path) {
444 iucv->path = NULL;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
450 } else
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
453 }
454 }
455
456 /* Send FIN through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
458 {
459 int err = 0;
460 int blen;
461 struct sk_buff *skb;
462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 skb = sock_alloc_send_skb(sk, blen, 1, &err);
465 if (skb) {
466 skb_reserve(skb, blen);
467 err = afiucv_hs_send(NULL, sk, skb, flags);
468 }
469 return err;
470 }
471
472 /* Close an IUCV socket */
473 static void iucv_sock_close(struct sock *sk)
474 {
475 struct iucv_sock *iucv = iucv_sk(sk);
476 unsigned long timeo;
477 int err = 0;
478
479 lock_sock(sk);
480
481 switch (sk->sk_state) {
482 case IUCV_LISTEN:
483 iucv_sock_cleanup_listen(sk);
484 break;
485
486 case IUCV_CONNECTED:
487 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
489 sk->sk_state = IUCV_DISCONN;
490 sk->sk_state_change(sk);
491 }
492 case IUCV_DISCONN: /* fall through */
493 sk->sk_state = IUCV_CLOSING;
494 sk->sk_state_change(sk);
495
496 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
498 timeo = sk->sk_lingertime;
499 else
500 timeo = IUCV_DISCONN_TIMEOUT;
501 iucv_sock_wait(sk,
502 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
503 timeo);
504 }
505
506 case IUCV_CLOSING: /* fall through */
507 sk->sk_state = IUCV_CLOSED;
508 sk->sk_state_change(sk);
509
510 sk->sk_err = ECONNRESET;
511 sk->sk_state_change(sk);
512
513 skb_queue_purge(&iucv->send_skb_q);
514 skb_queue_purge(&iucv->backlog_skb_q);
515
516 default: /* fall through */
517 iucv_sever_path(sk, 1);
518 }
519
520 if (iucv->hs_dev) {
521 dev_put(iucv->hs_dev);
522 iucv->hs_dev = NULL;
523 sk->sk_bound_dev_if = 0;
524 }
525
526 /* mark socket for deletion by iucv_sock_kill() */
527 sock_set_flag(sk, SOCK_ZAPPED);
528
529 release_sock(sk);
530 }
531
532 static void iucv_sock_init(struct sock *sk, struct sock *parent)
533 {
534 if (parent)
535 sk->sk_type = parent->sk_type;
536 }
537
538 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
539 {
540 struct sock *sk;
541 struct iucv_sock *iucv;
542
543 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
544 if (!sk)
545 return NULL;
546 iucv = iucv_sk(sk);
547
548 sock_init_data(sock, sk);
549 INIT_LIST_HEAD(&iucv->accept_q);
550 spin_lock_init(&iucv->accept_q_lock);
551 skb_queue_head_init(&iucv->send_skb_q);
552 INIT_LIST_HEAD(&iucv->message_q.list);
553 spin_lock_init(&iucv->message_q.lock);
554 skb_queue_head_init(&iucv->backlog_skb_q);
555 iucv->send_tag = 0;
556 atomic_set(&iucv->pendings, 0);
557 iucv->flags = 0;
558 iucv->msglimit = 0;
559 atomic_set(&iucv->msg_sent, 0);
560 atomic_set(&iucv->msg_recv, 0);
561 iucv->path = NULL;
562 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
563 memset(&iucv->src_user_id , 0, 32);
564 if (pr_iucv)
565 iucv->transport = AF_IUCV_TRANS_IUCV;
566 else
567 iucv->transport = AF_IUCV_TRANS_HIPER;
568
569 sk->sk_destruct = iucv_sock_destruct;
570 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
571 sk->sk_allocation = GFP_DMA;
572
573 sock_reset_flag(sk, SOCK_ZAPPED);
574
575 sk->sk_protocol = proto;
576 sk->sk_state = IUCV_OPEN;
577
578 iucv_sock_link(&iucv_sk_list, sk);
579 return sk;
580 }
581
582 /* Create an IUCV socket */
583 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
584 int kern)
585 {
586 struct sock *sk;
587
588 if (protocol && protocol != PF_IUCV)
589 return -EPROTONOSUPPORT;
590
591 sock->state = SS_UNCONNECTED;
592
593 switch (sock->type) {
594 case SOCK_STREAM:
595 sock->ops = &iucv_sock_ops;
596 break;
597 case SOCK_SEQPACKET:
598 /* currently, proto ops can handle both sk types */
599 sock->ops = &iucv_sock_ops;
600 break;
601 default:
602 return -ESOCKTNOSUPPORT;
603 }
604
605 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
606 if (!sk)
607 return -ENOMEM;
608
609 iucv_sock_init(sk, NULL);
610
611 return 0;
612 }
613
614 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
615 {
616 write_lock_bh(&l->lock);
617 sk_add_node(sk, &l->head);
618 write_unlock_bh(&l->lock);
619 }
620
621 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
622 {
623 write_lock_bh(&l->lock);
624 sk_del_node_init(sk);
625 write_unlock_bh(&l->lock);
626 }
627
628 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
629 {
630 unsigned long flags;
631 struct iucv_sock *par = iucv_sk(parent);
632
633 sock_hold(sk);
634 spin_lock_irqsave(&par->accept_q_lock, flags);
635 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
636 spin_unlock_irqrestore(&par->accept_q_lock, flags);
637 iucv_sk(sk)->parent = parent;
638 sk_acceptq_added(parent);
639 }
640
641 void iucv_accept_unlink(struct sock *sk)
642 {
643 unsigned long flags;
644 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
645
646 spin_lock_irqsave(&par->accept_q_lock, flags);
647 list_del_init(&iucv_sk(sk)->accept_q);
648 spin_unlock_irqrestore(&par->accept_q_lock, flags);
649 sk_acceptq_removed(iucv_sk(sk)->parent);
650 iucv_sk(sk)->parent = NULL;
651 sock_put(sk);
652 }
653
654 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
655 {
656 struct iucv_sock *isk, *n;
657 struct sock *sk;
658
659 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
660 sk = (struct sock *) isk;
661 lock_sock(sk);
662
663 if (sk->sk_state == IUCV_CLOSED) {
664 iucv_accept_unlink(sk);
665 release_sock(sk);
666 continue;
667 }
668
669 if (sk->sk_state == IUCV_CONNECTED ||
670 sk->sk_state == IUCV_DISCONN ||
671 !newsock) {
672 iucv_accept_unlink(sk);
673 if (newsock)
674 sock_graft(sk, newsock);
675
676 release_sock(sk);
677 return sk;
678 }
679
680 release_sock(sk);
681 }
682 return NULL;
683 }
684
685 static void __iucv_auto_name(struct iucv_sock *iucv)
686 {
687 char name[12];
688
689 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
690 while (__iucv_get_sock_by_name(name)) {
691 sprintf(name, "%08x",
692 atomic_inc_return(&iucv_sk_list.autobind_name));
693 }
694 memcpy(iucv->src_name, name, 8);
695 }
696
697 /* Bind an unbound socket */
698 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
699 int addr_len)
700 {
701 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
702 struct sock *sk = sock->sk;
703 struct iucv_sock *iucv;
704 int err = 0;
705 struct net_device *dev;
706 char uid[9];
707
708 /* Verify the input sockaddr */
709 if (!addr || addr->sa_family != AF_IUCV)
710 return -EINVAL;
711
712 lock_sock(sk);
713 if (sk->sk_state != IUCV_OPEN) {
714 err = -EBADFD;
715 goto done;
716 }
717
718 write_lock_bh(&iucv_sk_list.lock);
719
720 iucv = iucv_sk(sk);
721 if (__iucv_get_sock_by_name(sa->siucv_name)) {
722 err = -EADDRINUSE;
723 goto done_unlock;
724 }
725 if (iucv->path)
726 goto done_unlock;
727
728 /* Bind the socket */
729 if (pr_iucv)
730 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
731 goto vm_bind; /* VM IUCV transport */
732
733 /* try hiper transport */
734 memcpy(uid, sa->siucv_user_id, sizeof(uid));
735 ASCEBC(uid, 8);
736 rcu_read_lock();
737 for_each_netdev_rcu(&init_net, dev) {
738 if (!memcmp(dev->perm_addr, uid, 8)) {
739 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
740 /* Check for unitialized siucv_name */
741 if (strncmp(sa->siucv_name, " ", 8) == 0)
742 __iucv_auto_name(iucv);
743 else
744 memcpy(iucv->src_name, sa->siucv_name, 8);
745 sk->sk_bound_dev_if = dev->ifindex;
746 iucv->hs_dev = dev;
747 dev_hold(dev);
748 sk->sk_state = IUCV_BOUND;
749 iucv->transport = AF_IUCV_TRANS_HIPER;
750 if (!iucv->msglimit)
751 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
752 rcu_read_unlock();
753 goto done_unlock;
754 }
755 }
756 rcu_read_unlock();
757 vm_bind:
758 if (pr_iucv) {
759 /* use local userid for backward compat */
760 memcpy(iucv->src_name, sa->siucv_name, 8);
761 memcpy(iucv->src_user_id, iucv_userid, 8);
762 sk->sk_state = IUCV_BOUND;
763 iucv->transport = AF_IUCV_TRANS_IUCV;
764 if (!iucv->msglimit)
765 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
766 goto done_unlock;
767 }
768 /* found no dev to bind */
769 err = -ENODEV;
770 done_unlock:
771 /* Release the socket list lock */
772 write_unlock_bh(&iucv_sk_list.lock);
773 done:
774 release_sock(sk);
775 return err;
776 }
777
778 /* Automatically bind an unbound socket */
779 static int iucv_sock_autobind(struct sock *sk)
780 {
781 struct iucv_sock *iucv = iucv_sk(sk);
782 int err = 0;
783
784 if (unlikely(!pr_iucv))
785 return -EPROTO;
786
787 memcpy(iucv->src_user_id, iucv_userid, 8);
788
789 write_lock_bh(&iucv_sk_list.lock);
790 __iucv_auto_name(iucv);
791 write_unlock_bh(&iucv_sk_list.lock);
792
793 if (!iucv->msglimit)
794 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
795
796 return err;
797 }
798
799 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
800 {
801 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
802 struct sock *sk = sock->sk;
803 struct iucv_sock *iucv = iucv_sk(sk);
804 unsigned char user_data[16];
805 int err;
806
807 high_nmcpy(user_data, sa->siucv_name);
808 low_nmcpy(user_data, iucv->src_name);
809 ASCEBC(user_data, sizeof(user_data));
810
811 /* Create path. */
812 iucv->path = iucv_path_alloc(iucv->msglimit,
813 IUCV_IPRMDATA, GFP_KERNEL);
814 if (!iucv->path) {
815 err = -ENOMEM;
816 goto done;
817 }
818 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
819 sa->siucv_user_id, NULL, user_data,
820 sk);
821 if (err) {
822 iucv_path_free(iucv->path);
823 iucv->path = NULL;
824 switch (err) {
825 case 0x0b: /* Target communicator is not logged on */
826 err = -ENETUNREACH;
827 break;
828 case 0x0d: /* Max connections for this guest exceeded */
829 case 0x0e: /* Max connections for target guest exceeded */
830 err = -EAGAIN;
831 break;
832 case 0x0f: /* Missing IUCV authorization */
833 err = -EACCES;
834 break;
835 default:
836 err = -ECONNREFUSED;
837 break;
838 }
839 }
840 done:
841 return err;
842 }
843
844 /* Connect an unconnected socket */
845 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
846 int alen, int flags)
847 {
848 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
849 struct sock *sk = sock->sk;
850 struct iucv_sock *iucv = iucv_sk(sk);
851 int err;
852
853 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
854 return -EINVAL;
855
856 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
857 return -EBADFD;
858
859 if (sk->sk_state == IUCV_OPEN &&
860 iucv->transport == AF_IUCV_TRANS_HIPER)
861 return -EBADFD; /* explicit bind required */
862
863 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
864 return -EINVAL;
865
866 if (sk->sk_state == IUCV_OPEN) {
867 err = iucv_sock_autobind(sk);
868 if (unlikely(err))
869 return err;
870 }
871
872 lock_sock(sk);
873
874 /* Set the destination information */
875 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
876 memcpy(iucv->dst_name, sa->siucv_name, 8);
877
878 if (iucv->transport == AF_IUCV_TRANS_HIPER)
879 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
880 else
881 err = afiucv_path_connect(sock, addr);
882 if (err)
883 goto done;
884
885 if (sk->sk_state != IUCV_CONNECTED)
886 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
887 IUCV_DISCONN),
888 sock_sndtimeo(sk, flags & O_NONBLOCK));
889
890 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
891 err = -ECONNREFUSED;
892
893 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
894 iucv_sever_path(sk, 0);
895
896 done:
897 release_sock(sk);
898 return err;
899 }
900
901 /* Move a socket into listening state. */
902 static int iucv_sock_listen(struct socket *sock, int backlog)
903 {
904 struct sock *sk = sock->sk;
905 int err;
906
907 lock_sock(sk);
908
909 err = -EINVAL;
910 if (sk->sk_state != IUCV_BOUND)
911 goto done;
912
913 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
914 goto done;
915
916 sk->sk_max_ack_backlog = backlog;
917 sk->sk_ack_backlog = 0;
918 sk->sk_state = IUCV_LISTEN;
919 err = 0;
920
921 done:
922 release_sock(sk);
923 return err;
924 }
925
926 /* Accept a pending connection */
927 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
928 int flags)
929 {
930 DECLARE_WAITQUEUE(wait, current);
931 struct sock *sk = sock->sk, *nsk;
932 long timeo;
933 int err = 0;
934
935 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
936
937 if (sk->sk_state != IUCV_LISTEN) {
938 err = -EBADFD;
939 goto done;
940 }
941
942 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
943
944 /* Wait for an incoming connection */
945 add_wait_queue_exclusive(sk_sleep(sk), &wait);
946 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
947 set_current_state(TASK_INTERRUPTIBLE);
948 if (!timeo) {
949 err = -EAGAIN;
950 break;
951 }
952
953 release_sock(sk);
954 timeo = schedule_timeout(timeo);
955 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
956
957 if (sk->sk_state != IUCV_LISTEN) {
958 err = -EBADFD;
959 break;
960 }
961
962 if (signal_pending(current)) {
963 err = sock_intr_errno(timeo);
964 break;
965 }
966 }
967
968 set_current_state(TASK_RUNNING);
969 remove_wait_queue(sk_sleep(sk), &wait);
970
971 if (err)
972 goto done;
973
974 newsock->state = SS_CONNECTED;
975
976 done:
977 release_sock(sk);
978 return err;
979 }
980
981 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
982 int *len, int peer)
983 {
984 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
985 struct sock *sk = sock->sk;
986 struct iucv_sock *iucv = iucv_sk(sk);
987
988 addr->sa_family = AF_IUCV;
989 *len = sizeof(struct sockaddr_iucv);
990
991 if (peer) {
992 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
993 memcpy(siucv->siucv_name, iucv->dst_name, 8);
994 } else {
995 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
996 memcpy(siucv->siucv_name, iucv->src_name, 8);
997 }
998 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
999 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1000 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1001
1002 return 0;
1003 }
1004
1005 /**
1006 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1007 * @path: IUCV path
1008 * @msg: Pointer to a struct iucv_message
1009 * @skb: The socket data to send, skb->len MUST BE <= 7
1010 *
1011 * Send the socket data in the parameter list in the iucv message
1012 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1013 * list and the socket data len at index 7 (last byte).
1014 * See also iucv_msg_length().
1015 *
1016 * Returns the error code from the iucv_message_send() call.
1017 */
1018 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1019 struct sk_buff *skb)
1020 {
1021 u8 prmdata[8];
1022
1023 memcpy(prmdata, (void *) skb->data, skb->len);
1024 prmdata[7] = 0xff - (u8) skb->len;
1025 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1026 (void *) prmdata, 8);
1027 }
1028
1029 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1030 struct msghdr *msg, size_t len)
1031 {
1032 struct sock *sk = sock->sk;
1033 struct iucv_sock *iucv = iucv_sk(sk);
1034 struct sk_buff *skb;
1035 struct iucv_message txmsg;
1036 struct cmsghdr *cmsg;
1037 int cmsg_done;
1038 long timeo;
1039 char user_id[9];
1040 char appl_id[9];
1041 int err;
1042 int noblock = msg->msg_flags & MSG_DONTWAIT;
1043
1044 err = sock_error(sk);
1045 if (err)
1046 return err;
1047
1048 if (msg->msg_flags & MSG_OOB)
1049 return -EOPNOTSUPP;
1050
1051 /* SOCK_SEQPACKET: we do not support segmented records */
1052 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1053 return -EOPNOTSUPP;
1054
1055 lock_sock(sk);
1056
1057 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1058 err = -EPIPE;
1059 goto out;
1060 }
1061
1062 /* Return if the socket is not in connected state */
1063 if (sk->sk_state != IUCV_CONNECTED) {
1064 err = -ENOTCONN;
1065 goto out;
1066 }
1067
1068 /* initialize defaults */
1069 cmsg_done = 0; /* check for duplicate headers */
1070 txmsg.class = 0;
1071
1072 /* iterate over control messages */
1073 for_each_cmsghdr(cmsg, msg) {
1074 if (!CMSG_OK(msg, cmsg)) {
1075 err = -EINVAL;
1076 goto out;
1077 }
1078
1079 if (cmsg->cmsg_level != SOL_IUCV)
1080 continue;
1081
1082 if (cmsg->cmsg_type & cmsg_done) {
1083 err = -EINVAL;
1084 goto out;
1085 }
1086 cmsg_done |= cmsg->cmsg_type;
1087
1088 switch (cmsg->cmsg_type) {
1089 case SCM_IUCV_TRGCLS:
1090 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1091 err = -EINVAL;
1092 goto out;
1093 }
1094
1095 /* set iucv message target class */
1096 memcpy(&txmsg.class,
1097 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1098
1099 break;
1100
1101 default:
1102 err = -EINVAL;
1103 goto out;
1104 }
1105 }
1106
1107 /* allocate one skb for each iucv message:
1108 * this is fine for SOCK_SEQPACKET (unless we want to support
1109 * segmented records using the MSG_EOR flag), but
1110 * for SOCK_STREAM we might want to improve it in future */
1111 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1112 skb = sock_alloc_send_skb(sk,
1113 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1114 noblock, &err);
1115 else
1116 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1117 if (!skb)
1118 goto out;
1119 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1120 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1121 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1122 err = -EFAULT;
1123 goto fail;
1124 }
1125
1126 /* wait if outstanding messages for iucv path has reached */
1127 timeo = sock_sndtimeo(sk, noblock);
1128 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1129 if (err)
1130 goto fail;
1131
1132 /* return -ECONNRESET if the socket is no longer connected */
1133 if (sk->sk_state != IUCV_CONNECTED) {
1134 err = -ECONNRESET;
1135 goto fail;
1136 }
1137
1138 /* increment and save iucv message tag for msg_completion cbk */
1139 txmsg.tag = iucv->send_tag++;
1140 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1141
1142 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1143 atomic_inc(&iucv->msg_sent);
1144 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1145 if (err) {
1146 atomic_dec(&iucv->msg_sent);
1147 goto fail;
1148 }
1149 goto release;
1150 }
1151 skb_queue_tail(&iucv->send_skb_q, skb);
1152
1153 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1154 && skb->len <= 7) {
1155 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1156
1157 /* on success: there is no message_complete callback
1158 * for an IPRMDATA msg; remove skb from send queue */
1159 if (err == 0) {
1160 skb_unlink(skb, &iucv->send_skb_q);
1161 kfree_skb(skb);
1162 }
1163
1164 /* this error should never happen since the
1165 * IUCV_IPRMDATA path flag is set... sever path */
1166 if (err == 0x15) {
1167 pr_iucv->path_sever(iucv->path, NULL);
1168 skb_unlink(skb, &iucv->send_skb_q);
1169 err = -EPIPE;
1170 goto fail;
1171 }
1172 } else
1173 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1174 (void *) skb->data, skb->len);
1175 if (err) {
1176 if (err == 3) {
1177 user_id[8] = 0;
1178 memcpy(user_id, iucv->dst_user_id, 8);
1179 appl_id[8] = 0;
1180 memcpy(appl_id, iucv->dst_name, 8);
1181 pr_err("Application %s on z/VM guest %s"
1182 " exceeds message limit\n",
1183 appl_id, user_id);
1184 err = -EAGAIN;
1185 } else
1186 err = -EPIPE;
1187 skb_unlink(skb, &iucv->send_skb_q);
1188 goto fail;
1189 }
1190
1191 release:
1192 release_sock(sk);
1193 return len;
1194
1195 fail:
1196 kfree_skb(skb);
1197 out:
1198 release_sock(sk);
1199 return err;
1200 }
1201
1202 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1203 *
1204 * Locking: must be called with message_q.lock held
1205 */
1206 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1207 {
1208 int dataleft, size, copied = 0;
1209 struct sk_buff *nskb;
1210
1211 dataleft = len;
1212 while (dataleft) {
1213 if (dataleft >= sk->sk_rcvbuf / 4)
1214 size = sk->sk_rcvbuf / 4;
1215 else
1216 size = dataleft;
1217
1218 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1219 if (!nskb)
1220 return -ENOMEM;
1221
1222 /* copy target class to control buffer of new skb */
1223 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1224
1225 /* copy data fragment */
1226 memcpy(nskb->data, skb->data + copied, size);
1227 copied += size;
1228 dataleft -= size;
1229
1230 skb_reset_transport_header(nskb);
1231 skb_reset_network_header(nskb);
1232 nskb->len = size;
1233
1234 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1235 }
1236
1237 return 0;
1238 }
1239
1240 /* iucv_process_message() - Receive a single outstanding IUCV message
1241 *
1242 * Locking: must be called with message_q.lock held
1243 */
1244 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1245 struct iucv_path *path,
1246 struct iucv_message *msg)
1247 {
1248 int rc;
1249 unsigned int len;
1250
1251 len = iucv_msg_length(msg);
1252
1253 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1254 /* Note: the first 4 bytes are reserved for msg tag */
1255 IUCV_SKB_CB(skb)->class = msg->class;
1256
1257 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1258 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1259 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1260 skb->data = NULL;
1261 skb->len = 0;
1262 }
1263 } else {
1264 rc = pr_iucv->message_receive(path, msg,
1265 msg->flags & IUCV_IPRMDATA,
1266 skb->data, len, NULL);
1267 if (rc) {
1268 kfree_skb(skb);
1269 return;
1270 }
1271 /* we need to fragment iucv messages for SOCK_STREAM only;
1272 * for SOCK_SEQPACKET, it is only relevant if we support
1273 * record segmentation using MSG_EOR (see also recvmsg()) */
1274 if (sk->sk_type == SOCK_STREAM &&
1275 skb->truesize >= sk->sk_rcvbuf / 4) {
1276 rc = iucv_fragment_skb(sk, skb, len);
1277 kfree_skb(skb);
1278 skb = NULL;
1279 if (rc) {
1280 pr_iucv->path_sever(path, NULL);
1281 return;
1282 }
1283 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1284 } else {
1285 skb_reset_transport_header(skb);
1286 skb_reset_network_header(skb);
1287 skb->len = len;
1288 }
1289 }
1290
1291 IUCV_SKB_CB(skb)->offset = 0;
1292 if (sock_queue_rcv_skb(sk, skb))
1293 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1294 }
1295
1296 /* iucv_process_message_q() - Process outstanding IUCV messages
1297 *
1298 * Locking: must be called with message_q.lock held
1299 */
1300 static void iucv_process_message_q(struct sock *sk)
1301 {
1302 struct iucv_sock *iucv = iucv_sk(sk);
1303 struct sk_buff *skb;
1304 struct sock_msg_q *p, *n;
1305
1306 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1307 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1308 if (!skb)
1309 break;
1310 iucv_process_message(sk, skb, p->path, &p->msg);
1311 list_del(&p->list);
1312 kfree(p);
1313 if (!skb_queue_empty(&iucv->backlog_skb_q))
1314 break;
1315 }
1316 }
1317
1318 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1319 struct msghdr *msg, size_t len, int flags)
1320 {
1321 int noblock = flags & MSG_DONTWAIT;
1322 struct sock *sk = sock->sk;
1323 struct iucv_sock *iucv = iucv_sk(sk);
1324 unsigned int copied, rlen;
1325 struct sk_buff *skb, *rskb, *cskb;
1326 int err = 0;
1327 u32 offset;
1328
1329 if ((sk->sk_state == IUCV_DISCONN) &&
1330 skb_queue_empty(&iucv->backlog_skb_q) &&
1331 skb_queue_empty(&sk->sk_receive_queue) &&
1332 list_empty(&iucv->message_q.list))
1333 return 0;
1334
1335 if (flags & (MSG_OOB))
1336 return -EOPNOTSUPP;
1337
1338 /* receive/dequeue next skb:
1339 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1340 skb = skb_recv_datagram(sk, flags, noblock, &err);
1341 if (!skb) {
1342 if (sk->sk_shutdown & RCV_SHUTDOWN)
1343 return 0;
1344 return err;
1345 }
1346
1347 offset = IUCV_SKB_CB(skb)->offset;
1348 rlen = skb->len - offset; /* real length of skb */
1349 copied = min_t(unsigned int, rlen, len);
1350 if (!rlen)
1351 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1352
1353 cskb = skb;
1354 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1355 if (!(flags & MSG_PEEK))
1356 skb_queue_head(&sk->sk_receive_queue, skb);
1357 return -EFAULT;
1358 }
1359
1360 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1361 if (sk->sk_type == SOCK_SEQPACKET) {
1362 if (copied < rlen)
1363 msg->msg_flags |= MSG_TRUNC;
1364 /* each iucv message contains a complete record */
1365 msg->msg_flags |= MSG_EOR;
1366 }
1367
1368 /* create control message to store iucv msg target class:
1369 * get the trgcls from the control buffer of the skb due to
1370 * fragmentation of original iucv message. */
1371 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1372 sizeof(IUCV_SKB_CB(skb)->class),
1373 (void *)&IUCV_SKB_CB(skb)->class);
1374 if (err) {
1375 if (!(flags & MSG_PEEK))
1376 skb_queue_head(&sk->sk_receive_queue, skb);
1377 return err;
1378 }
1379
1380 /* Mark read part of skb as used */
1381 if (!(flags & MSG_PEEK)) {
1382
1383 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1384 if (sk->sk_type == SOCK_STREAM) {
1385 if (copied < rlen) {
1386 IUCV_SKB_CB(skb)->offset = offset + copied;
1387 skb_queue_head(&sk->sk_receive_queue, skb);
1388 goto done;
1389 }
1390 }
1391
1392 kfree_skb(skb);
1393 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1394 atomic_inc(&iucv->msg_recv);
1395 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1396 WARN_ON(1);
1397 iucv_sock_close(sk);
1398 return -EFAULT;
1399 }
1400 }
1401
1402 /* Queue backlog skbs */
1403 spin_lock_bh(&iucv->message_q.lock);
1404 rskb = skb_dequeue(&iucv->backlog_skb_q);
1405 while (rskb) {
1406 IUCV_SKB_CB(rskb)->offset = 0;
1407 if (sock_queue_rcv_skb(sk, rskb)) {
1408 skb_queue_head(&iucv->backlog_skb_q,
1409 rskb);
1410 break;
1411 } else {
1412 rskb = skb_dequeue(&iucv->backlog_skb_q);
1413 }
1414 }
1415 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1416 if (!list_empty(&iucv->message_q.list))
1417 iucv_process_message_q(sk);
1418 if (atomic_read(&iucv->msg_recv) >=
1419 iucv->msglimit / 2) {
1420 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1421 if (err) {
1422 sk->sk_state = IUCV_DISCONN;
1423 sk->sk_state_change(sk);
1424 }
1425 }
1426 }
1427 spin_unlock_bh(&iucv->message_q.lock);
1428 }
1429
1430 done:
1431 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1432 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1433 copied = rlen;
1434
1435 return copied;
1436 }
1437
1438 static inline unsigned int iucv_accept_poll(struct sock *parent)
1439 {
1440 struct iucv_sock *isk, *n;
1441 struct sock *sk;
1442
1443 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1444 sk = (struct sock *) isk;
1445
1446 if (sk->sk_state == IUCV_CONNECTED)
1447 return POLLIN | POLLRDNORM;
1448 }
1449
1450 return 0;
1451 }
1452
1453 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1454 poll_table *wait)
1455 {
1456 struct sock *sk = sock->sk;
1457 unsigned int mask = 0;
1458
1459 sock_poll_wait(file, sk_sleep(sk), wait);
1460
1461 if (sk->sk_state == IUCV_LISTEN)
1462 return iucv_accept_poll(sk);
1463
1464 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1465 mask |= POLLERR |
1466 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1467
1468 if (sk->sk_shutdown & RCV_SHUTDOWN)
1469 mask |= POLLRDHUP;
1470
1471 if (sk->sk_shutdown == SHUTDOWN_MASK)
1472 mask |= POLLHUP;
1473
1474 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1475 (sk->sk_shutdown & RCV_SHUTDOWN))
1476 mask |= POLLIN | POLLRDNORM;
1477
1478 if (sk->sk_state == IUCV_CLOSED)
1479 mask |= POLLHUP;
1480
1481 if (sk->sk_state == IUCV_DISCONN)
1482 mask |= POLLIN;
1483
1484 if (sock_writeable(sk) && iucv_below_msglim(sk))
1485 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1486 else
1487 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1488
1489 return mask;
1490 }
1491
1492 static int iucv_sock_shutdown(struct socket *sock, int how)
1493 {
1494 struct sock *sk = sock->sk;
1495 struct iucv_sock *iucv = iucv_sk(sk);
1496 struct iucv_message txmsg;
1497 int err = 0;
1498
1499 how++;
1500
1501 if ((how & ~SHUTDOWN_MASK) || !how)
1502 return -EINVAL;
1503
1504 lock_sock(sk);
1505 switch (sk->sk_state) {
1506 case IUCV_LISTEN:
1507 case IUCV_DISCONN:
1508 case IUCV_CLOSING:
1509 case IUCV_CLOSED:
1510 err = -ENOTCONN;
1511 goto fail;
1512 default:
1513 break;
1514 }
1515
1516 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1517 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1518 txmsg.class = 0;
1519 txmsg.tag = 0;
1520 err = pr_iucv->message_send(iucv->path, &txmsg,
1521 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1522 if (err) {
1523 switch (err) {
1524 case 1:
1525 err = -ENOTCONN;
1526 break;
1527 case 2:
1528 err = -ECONNRESET;
1529 break;
1530 default:
1531 err = -ENOTCONN;
1532 break;
1533 }
1534 }
1535 } else
1536 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1537 }
1538
1539 sk->sk_shutdown |= how;
1540 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1541 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1542 iucv->path) {
1543 err = pr_iucv->path_quiesce(iucv->path, NULL);
1544 if (err)
1545 err = -ENOTCONN;
1546 /* skb_queue_purge(&sk->sk_receive_queue); */
1547 }
1548 skb_queue_purge(&sk->sk_receive_queue);
1549 }
1550
1551 /* Wake up anyone sleeping in poll */
1552 sk->sk_state_change(sk);
1553
1554 fail:
1555 release_sock(sk);
1556 return err;
1557 }
1558
1559 static int iucv_sock_release(struct socket *sock)
1560 {
1561 struct sock *sk = sock->sk;
1562 int err = 0;
1563
1564 if (!sk)
1565 return 0;
1566
1567 iucv_sock_close(sk);
1568
1569 sock_orphan(sk);
1570 iucv_sock_kill(sk);
1571 return err;
1572 }
1573
1574 /* getsockopt and setsockopt */
1575 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1576 char __user *optval, unsigned int optlen)
1577 {
1578 struct sock *sk = sock->sk;
1579 struct iucv_sock *iucv = iucv_sk(sk);
1580 int val;
1581 int rc;
1582
1583 if (level != SOL_IUCV)
1584 return -ENOPROTOOPT;
1585
1586 if (optlen < sizeof(int))
1587 return -EINVAL;
1588
1589 if (get_user(val, (int __user *) optval))
1590 return -EFAULT;
1591
1592 rc = 0;
1593
1594 lock_sock(sk);
1595 switch (optname) {
1596 case SO_IPRMDATA_MSG:
1597 if (val)
1598 iucv->flags |= IUCV_IPRMDATA;
1599 else
1600 iucv->flags &= ~IUCV_IPRMDATA;
1601 break;
1602 case SO_MSGLIMIT:
1603 switch (sk->sk_state) {
1604 case IUCV_OPEN:
1605 case IUCV_BOUND:
1606 if (val < 1 || val > (u16)(~0))
1607 rc = -EINVAL;
1608 else
1609 iucv->msglimit = val;
1610 break;
1611 default:
1612 rc = -EINVAL;
1613 break;
1614 }
1615 break;
1616 default:
1617 rc = -ENOPROTOOPT;
1618 break;
1619 }
1620 release_sock(sk);
1621
1622 return rc;
1623 }
1624
1625 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1626 char __user *optval, int __user *optlen)
1627 {
1628 struct sock *sk = sock->sk;
1629 struct iucv_sock *iucv = iucv_sk(sk);
1630 unsigned int val;
1631 int len;
1632
1633 if (level != SOL_IUCV)
1634 return -ENOPROTOOPT;
1635
1636 if (get_user(len, optlen))
1637 return -EFAULT;
1638
1639 if (len < 0)
1640 return -EINVAL;
1641
1642 len = min_t(unsigned int, len, sizeof(int));
1643
1644 switch (optname) {
1645 case SO_IPRMDATA_MSG:
1646 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1647 break;
1648 case SO_MSGLIMIT:
1649 lock_sock(sk);
1650 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1651 : iucv->msglimit; /* default */
1652 release_sock(sk);
1653 break;
1654 case SO_MSGSIZE:
1655 if (sk->sk_state == IUCV_OPEN)
1656 return -EBADFD;
1657 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1658 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1659 0x7fffffff;
1660 break;
1661 default:
1662 return -ENOPROTOOPT;
1663 }
1664
1665 if (put_user(len, optlen))
1666 return -EFAULT;
1667 if (copy_to_user(optval, &val, len))
1668 return -EFAULT;
1669
1670 return 0;
1671 }
1672
1673
1674 /* Callback wrappers - called from iucv base support */
1675 static int iucv_callback_connreq(struct iucv_path *path,
1676 u8 ipvmid[8], u8 ipuser[16])
1677 {
1678 unsigned char user_data[16];
1679 unsigned char nuser_data[16];
1680 unsigned char src_name[8];
1681 struct sock *sk, *nsk;
1682 struct iucv_sock *iucv, *niucv;
1683 int err;
1684
1685 memcpy(src_name, ipuser, 8);
1686 EBCASC(src_name, 8);
1687 /* Find out if this path belongs to af_iucv. */
1688 read_lock(&iucv_sk_list.lock);
1689 iucv = NULL;
1690 sk = NULL;
1691 sk_for_each(sk, &iucv_sk_list.head)
1692 if (sk->sk_state == IUCV_LISTEN &&
1693 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1694 /*
1695 * Found a listening socket with
1696 * src_name == ipuser[0-7].
1697 */
1698 iucv = iucv_sk(sk);
1699 break;
1700 }
1701 read_unlock(&iucv_sk_list.lock);
1702 if (!iucv)
1703 /* No socket found, not one of our paths. */
1704 return -EINVAL;
1705
1706 bh_lock_sock(sk);
1707
1708 /* Check if parent socket is listening */
1709 low_nmcpy(user_data, iucv->src_name);
1710 high_nmcpy(user_data, iucv->dst_name);
1711 ASCEBC(user_data, sizeof(user_data));
1712 if (sk->sk_state != IUCV_LISTEN) {
1713 err = pr_iucv->path_sever(path, user_data);
1714 iucv_path_free(path);
1715 goto fail;
1716 }
1717
1718 /* Check for backlog size */
1719 if (sk_acceptq_is_full(sk)) {
1720 err = pr_iucv->path_sever(path, user_data);
1721 iucv_path_free(path);
1722 goto fail;
1723 }
1724
1725 /* Create the new socket */
1726 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1727 if (!nsk) {
1728 err = pr_iucv->path_sever(path, user_data);
1729 iucv_path_free(path);
1730 goto fail;
1731 }
1732
1733 niucv = iucv_sk(nsk);
1734 iucv_sock_init(nsk, sk);
1735
1736 /* Set the new iucv_sock */
1737 memcpy(niucv->dst_name, ipuser + 8, 8);
1738 EBCASC(niucv->dst_name, 8);
1739 memcpy(niucv->dst_user_id, ipvmid, 8);
1740 memcpy(niucv->src_name, iucv->src_name, 8);
1741 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1742 niucv->path = path;
1743
1744 /* Call iucv_accept */
1745 high_nmcpy(nuser_data, ipuser + 8);
1746 memcpy(nuser_data + 8, niucv->src_name, 8);
1747 ASCEBC(nuser_data + 8, 8);
1748
1749 /* set message limit for path based on msglimit of accepting socket */
1750 niucv->msglimit = iucv->msglimit;
1751 path->msglim = iucv->msglimit;
1752 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1753 if (err) {
1754 iucv_sever_path(nsk, 1);
1755 iucv_sock_kill(nsk);
1756 goto fail;
1757 }
1758
1759 iucv_accept_enqueue(sk, nsk);
1760
1761 /* Wake up accept */
1762 nsk->sk_state = IUCV_CONNECTED;
1763 sk->sk_data_ready(sk);
1764 err = 0;
1765 fail:
1766 bh_unlock_sock(sk);
1767 return 0;
1768 }
1769
1770 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1771 {
1772 struct sock *sk = path->private;
1773
1774 sk->sk_state = IUCV_CONNECTED;
1775 sk->sk_state_change(sk);
1776 }
1777
1778 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1779 {
1780 struct sock *sk = path->private;
1781 struct iucv_sock *iucv = iucv_sk(sk);
1782 struct sk_buff *skb;
1783 struct sock_msg_q *save_msg;
1784 int len;
1785
1786 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1787 pr_iucv->message_reject(path, msg);
1788 return;
1789 }
1790
1791 spin_lock(&iucv->message_q.lock);
1792
1793 if (!list_empty(&iucv->message_q.list) ||
1794 !skb_queue_empty(&iucv->backlog_skb_q))
1795 goto save_message;
1796
1797 len = atomic_read(&sk->sk_rmem_alloc);
1798 len += SKB_TRUESIZE(iucv_msg_length(msg));
1799 if (len > sk->sk_rcvbuf)
1800 goto save_message;
1801
1802 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1803 if (!skb)
1804 goto save_message;
1805
1806 iucv_process_message(sk, skb, path, msg);
1807 goto out_unlock;
1808
1809 save_message:
1810 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1811 if (!save_msg)
1812 goto out_unlock;
1813 save_msg->path = path;
1814 save_msg->msg = *msg;
1815
1816 list_add_tail(&save_msg->list, &iucv->message_q.list);
1817
1818 out_unlock:
1819 spin_unlock(&iucv->message_q.lock);
1820 }
1821
1822 static void iucv_callback_txdone(struct iucv_path *path,
1823 struct iucv_message *msg)
1824 {
1825 struct sock *sk = path->private;
1826 struct sk_buff *this = NULL;
1827 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1828 struct sk_buff *list_skb = list->next;
1829 unsigned long flags;
1830
1831 bh_lock_sock(sk);
1832 if (!skb_queue_empty(list)) {
1833 spin_lock_irqsave(&list->lock, flags);
1834
1835 while (list_skb != (struct sk_buff *)list) {
1836 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1837 this = list_skb;
1838 break;
1839 }
1840 list_skb = list_skb->next;
1841 }
1842 if (this)
1843 __skb_unlink(this, list);
1844
1845 spin_unlock_irqrestore(&list->lock, flags);
1846
1847 if (this) {
1848 kfree_skb(this);
1849 /* wake up any process waiting for sending */
1850 iucv_sock_wake_msglim(sk);
1851 }
1852 }
1853
1854 if (sk->sk_state == IUCV_CLOSING) {
1855 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1856 sk->sk_state = IUCV_CLOSED;
1857 sk->sk_state_change(sk);
1858 }
1859 }
1860 bh_unlock_sock(sk);
1861
1862 }
1863
1864 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1865 {
1866 struct sock *sk = path->private;
1867
1868 if (sk->sk_state == IUCV_CLOSED)
1869 return;
1870
1871 bh_lock_sock(sk);
1872 iucv_sever_path(sk, 1);
1873 sk->sk_state = IUCV_DISCONN;
1874
1875 sk->sk_state_change(sk);
1876 bh_unlock_sock(sk);
1877 }
1878
1879 /* called if the other communication side shuts down its RECV direction;
1880 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1881 */
1882 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1883 {
1884 struct sock *sk = path->private;
1885
1886 bh_lock_sock(sk);
1887 if (sk->sk_state != IUCV_CLOSED) {
1888 sk->sk_shutdown |= SEND_SHUTDOWN;
1889 sk->sk_state_change(sk);
1890 }
1891 bh_unlock_sock(sk);
1892 }
1893
1894 /***************** HiperSockets transport callbacks ********************/
1895 static void afiucv_swap_src_dest(struct sk_buff *skb)
1896 {
1897 struct af_iucv_trans_hdr *trans_hdr =
1898 (struct af_iucv_trans_hdr *)skb->data;
1899 char tmpID[8];
1900 char tmpName[8];
1901
1902 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1903 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1904 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1905 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1906 memcpy(tmpID, trans_hdr->srcUserID, 8);
1907 memcpy(tmpName, trans_hdr->srcAppName, 8);
1908 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1909 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1910 memcpy(trans_hdr->destUserID, tmpID, 8);
1911 memcpy(trans_hdr->destAppName, tmpName, 8);
1912 skb_push(skb, ETH_HLEN);
1913 memset(skb->data, 0, ETH_HLEN);
1914 }
1915
1916 /**
1917 * afiucv_hs_callback_syn - react on received SYN
1918 **/
1919 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1920 {
1921 struct sock *nsk;
1922 struct iucv_sock *iucv, *niucv;
1923 struct af_iucv_trans_hdr *trans_hdr;
1924 int err;
1925
1926 iucv = iucv_sk(sk);
1927 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1928 if (!iucv) {
1929 /* no sock - connection refused */
1930 afiucv_swap_src_dest(skb);
1931 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1932 err = dev_queue_xmit(skb);
1933 goto out;
1934 }
1935
1936 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1937 bh_lock_sock(sk);
1938 if ((sk->sk_state != IUCV_LISTEN) ||
1939 sk_acceptq_is_full(sk) ||
1940 !nsk) {
1941 /* error on server socket - connection refused */
1942 afiucv_swap_src_dest(skb);
1943 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1944 err = dev_queue_xmit(skb);
1945 iucv_sock_kill(nsk);
1946 bh_unlock_sock(sk);
1947 goto out;
1948 }
1949
1950 niucv = iucv_sk(nsk);
1951 iucv_sock_init(nsk, sk);
1952 niucv->transport = AF_IUCV_TRANS_HIPER;
1953 niucv->msglimit = iucv->msglimit;
1954 if (!trans_hdr->window)
1955 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1956 else
1957 niucv->msglimit_peer = trans_hdr->window;
1958 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1959 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1960 memcpy(niucv->src_name, iucv->src_name, 8);
1961 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1962 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1963 niucv->hs_dev = iucv->hs_dev;
1964 dev_hold(niucv->hs_dev);
1965 afiucv_swap_src_dest(skb);
1966 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1967 trans_hdr->window = niucv->msglimit;
1968 /* if receiver acks the xmit connection is established */
1969 err = dev_queue_xmit(skb);
1970 if (!err) {
1971 iucv_accept_enqueue(sk, nsk);
1972 nsk->sk_state = IUCV_CONNECTED;
1973 sk->sk_data_ready(sk);
1974 } else
1975 iucv_sock_kill(nsk);
1976 bh_unlock_sock(sk);
1977
1978 out:
1979 return NET_RX_SUCCESS;
1980 }
1981
1982 /**
1983 * afiucv_hs_callback_synack() - react on received SYN-ACK
1984 **/
1985 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1986 {
1987 struct iucv_sock *iucv = iucv_sk(sk);
1988 struct af_iucv_trans_hdr *trans_hdr =
1989 (struct af_iucv_trans_hdr *)skb->data;
1990
1991 if (!iucv)
1992 goto out;
1993 if (sk->sk_state != IUCV_BOUND)
1994 goto out;
1995 bh_lock_sock(sk);
1996 iucv->msglimit_peer = trans_hdr->window;
1997 sk->sk_state = IUCV_CONNECTED;
1998 sk->sk_state_change(sk);
1999 bh_unlock_sock(sk);
2000 out:
2001 kfree_skb(skb);
2002 return NET_RX_SUCCESS;
2003 }
2004
2005 /**
2006 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2007 **/
2008 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2009 {
2010 struct iucv_sock *iucv = iucv_sk(sk);
2011
2012 if (!iucv)
2013 goto out;
2014 if (sk->sk_state != IUCV_BOUND)
2015 goto out;
2016 bh_lock_sock(sk);
2017 sk->sk_state = IUCV_DISCONN;
2018 sk->sk_state_change(sk);
2019 bh_unlock_sock(sk);
2020 out:
2021 kfree_skb(skb);
2022 return NET_RX_SUCCESS;
2023 }
2024
2025 /**
2026 * afiucv_hs_callback_fin() - react on received FIN
2027 **/
2028 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2029 {
2030 struct iucv_sock *iucv = iucv_sk(sk);
2031
2032 /* other end of connection closed */
2033 if (!iucv)
2034 goto out;
2035 bh_lock_sock(sk);
2036 if (sk->sk_state == IUCV_CONNECTED) {
2037 sk->sk_state = IUCV_DISCONN;
2038 sk->sk_state_change(sk);
2039 }
2040 bh_unlock_sock(sk);
2041 out:
2042 kfree_skb(skb);
2043 return NET_RX_SUCCESS;
2044 }
2045
2046 /**
2047 * afiucv_hs_callback_win() - react on received WIN
2048 **/
2049 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2050 {
2051 struct iucv_sock *iucv = iucv_sk(sk);
2052 struct af_iucv_trans_hdr *trans_hdr =
2053 (struct af_iucv_trans_hdr *)skb->data;
2054
2055 if (!iucv)
2056 return NET_RX_SUCCESS;
2057
2058 if (sk->sk_state != IUCV_CONNECTED)
2059 return NET_RX_SUCCESS;
2060
2061 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2062 iucv_sock_wake_msglim(sk);
2063 return NET_RX_SUCCESS;
2064 }
2065
2066 /**
2067 * afiucv_hs_callback_rx() - react on received data
2068 **/
2069 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2070 {
2071 struct iucv_sock *iucv = iucv_sk(sk);
2072
2073 if (!iucv) {
2074 kfree_skb(skb);
2075 return NET_RX_SUCCESS;
2076 }
2077
2078 if (sk->sk_state != IUCV_CONNECTED) {
2079 kfree_skb(skb);
2080 return NET_RX_SUCCESS;
2081 }
2082
2083 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2084 kfree_skb(skb);
2085 return NET_RX_SUCCESS;
2086 }
2087
2088 /* write stuff from iucv_msg to skb cb */
2089 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2090 kfree_skb(skb);
2091 return NET_RX_SUCCESS;
2092 }
2093 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2094 skb_reset_transport_header(skb);
2095 skb_reset_network_header(skb);
2096 IUCV_SKB_CB(skb)->offset = 0;
2097 spin_lock(&iucv->message_q.lock);
2098 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2099 if (sock_queue_rcv_skb(sk, skb)) {
2100 /* handle rcv queue full */
2101 skb_queue_tail(&iucv->backlog_skb_q, skb);
2102 }
2103 } else
2104 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2105 spin_unlock(&iucv->message_q.lock);
2106 return NET_RX_SUCCESS;
2107 }
2108
2109 /**
2110 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2111 * transport
2112 * called from netif RX softirq
2113 **/
2114 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2115 struct packet_type *pt, struct net_device *orig_dev)
2116 {
2117 struct sock *sk;
2118 struct iucv_sock *iucv;
2119 struct af_iucv_trans_hdr *trans_hdr;
2120 char nullstring[8];
2121 int err = 0;
2122
2123 skb_pull(skb, ETH_HLEN);
2124 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2125 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2126 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2127 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2128 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2129 memset(nullstring, 0, sizeof(nullstring));
2130 iucv = NULL;
2131 sk = NULL;
2132 read_lock(&iucv_sk_list.lock);
2133 sk_for_each(sk, &iucv_sk_list.head) {
2134 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2135 if ((!memcmp(&iucv_sk(sk)->src_name,
2136 trans_hdr->destAppName, 8)) &&
2137 (!memcmp(&iucv_sk(sk)->src_user_id,
2138 trans_hdr->destUserID, 8)) &&
2139 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2140 (!memcmp(&iucv_sk(sk)->dst_user_id,
2141 nullstring, 8))) {
2142 iucv = iucv_sk(sk);
2143 break;
2144 }
2145 } else {
2146 if ((!memcmp(&iucv_sk(sk)->src_name,
2147 trans_hdr->destAppName, 8)) &&
2148 (!memcmp(&iucv_sk(sk)->src_user_id,
2149 trans_hdr->destUserID, 8)) &&
2150 (!memcmp(&iucv_sk(sk)->dst_name,
2151 trans_hdr->srcAppName, 8)) &&
2152 (!memcmp(&iucv_sk(sk)->dst_user_id,
2153 trans_hdr->srcUserID, 8))) {
2154 iucv = iucv_sk(sk);
2155 break;
2156 }
2157 }
2158 }
2159 read_unlock(&iucv_sk_list.lock);
2160 if (!iucv)
2161 sk = NULL;
2162
2163 /* no sock
2164 how should we send with no sock
2165 1) send without sock no send rc checking?
2166 2) introduce default sock to handle this cases
2167
2168 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2169 data -> send FIN
2170 SYN|ACK, SYN|FIN, FIN -> no action? */
2171
2172 switch (trans_hdr->flags) {
2173 case AF_IUCV_FLAG_SYN:
2174 /* connect request */
2175 err = afiucv_hs_callback_syn(sk, skb);
2176 break;
2177 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2178 /* connect request confirmed */
2179 err = afiucv_hs_callback_synack(sk, skb);
2180 break;
2181 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2182 /* connect request refused */
2183 err = afiucv_hs_callback_synfin(sk, skb);
2184 break;
2185 case (AF_IUCV_FLAG_FIN):
2186 /* close request */
2187 err = afiucv_hs_callback_fin(sk, skb);
2188 break;
2189 case (AF_IUCV_FLAG_WIN):
2190 err = afiucv_hs_callback_win(sk, skb);
2191 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2192 kfree_skb(skb);
2193 break;
2194 }
2195 /* fall through and receive non-zero length data */
2196 case (AF_IUCV_FLAG_SHT):
2197 /* shutdown request */
2198 /* fall through and receive zero length data */
2199 case 0:
2200 /* plain data frame */
2201 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2202 err = afiucv_hs_callback_rx(sk, skb);
2203 break;
2204 default:
2205 ;
2206 }
2207
2208 return err;
2209 }
2210
2211 /**
2212 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2213 * transport
2214 **/
2215 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2216 enum iucv_tx_notify n)
2217 {
2218 struct sock *isk = skb->sk;
2219 struct sock *sk = NULL;
2220 struct iucv_sock *iucv = NULL;
2221 struct sk_buff_head *list;
2222 struct sk_buff *list_skb;
2223 struct sk_buff *nskb;
2224 unsigned long flags;
2225
2226 read_lock_irqsave(&iucv_sk_list.lock, flags);
2227 sk_for_each(sk, &iucv_sk_list.head)
2228 if (sk == isk) {
2229 iucv = iucv_sk(sk);
2230 break;
2231 }
2232 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2233
2234 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2235 return;
2236
2237 list = &iucv->send_skb_q;
2238 spin_lock_irqsave(&list->lock, flags);
2239 if (skb_queue_empty(list))
2240 goto out_unlock;
2241 list_skb = list->next;
2242 nskb = list_skb->next;
2243 while (list_skb != (struct sk_buff *)list) {
2244 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2245 switch (n) {
2246 case TX_NOTIFY_OK:
2247 __skb_unlink(list_skb, list);
2248 kfree_skb(list_skb);
2249 iucv_sock_wake_msglim(sk);
2250 break;
2251 case TX_NOTIFY_PENDING:
2252 atomic_inc(&iucv->pendings);
2253 break;
2254 case TX_NOTIFY_DELAYED_OK:
2255 __skb_unlink(list_skb, list);
2256 atomic_dec(&iucv->pendings);
2257 if (atomic_read(&iucv->pendings) <= 0)
2258 iucv_sock_wake_msglim(sk);
2259 kfree_skb(list_skb);
2260 break;
2261 case TX_NOTIFY_UNREACHABLE:
2262 case TX_NOTIFY_DELAYED_UNREACHABLE:
2263 case TX_NOTIFY_TPQFULL: /* not yet used */
2264 case TX_NOTIFY_GENERALERROR:
2265 case TX_NOTIFY_DELAYED_GENERALERROR:
2266 __skb_unlink(list_skb, list);
2267 kfree_skb(list_skb);
2268 if (sk->sk_state == IUCV_CONNECTED) {
2269 sk->sk_state = IUCV_DISCONN;
2270 sk->sk_state_change(sk);
2271 }
2272 break;
2273 }
2274 break;
2275 }
2276 list_skb = nskb;
2277 nskb = nskb->next;
2278 }
2279 out_unlock:
2280 spin_unlock_irqrestore(&list->lock, flags);
2281
2282 if (sk->sk_state == IUCV_CLOSING) {
2283 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2284 sk->sk_state = IUCV_CLOSED;
2285 sk->sk_state_change(sk);
2286 }
2287 }
2288
2289 }
2290
2291 /*
2292 * afiucv_netdev_event: handle netdev notifier chain events
2293 */
2294 static int afiucv_netdev_event(struct notifier_block *this,
2295 unsigned long event, void *ptr)
2296 {
2297 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2298 struct sock *sk;
2299 struct iucv_sock *iucv;
2300
2301 switch (event) {
2302 case NETDEV_REBOOT:
2303 case NETDEV_GOING_DOWN:
2304 sk_for_each(sk, &iucv_sk_list.head) {
2305 iucv = iucv_sk(sk);
2306 if ((iucv->hs_dev == event_dev) &&
2307 (sk->sk_state == IUCV_CONNECTED)) {
2308 if (event == NETDEV_GOING_DOWN)
2309 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2310 sk->sk_state = IUCV_DISCONN;
2311 sk->sk_state_change(sk);
2312 }
2313 }
2314 break;
2315 case NETDEV_DOWN:
2316 case NETDEV_UNREGISTER:
2317 default:
2318 break;
2319 }
2320 return NOTIFY_DONE;
2321 }
2322
2323 static struct notifier_block afiucv_netdev_notifier = {
2324 .notifier_call = afiucv_netdev_event,
2325 };
2326
2327 static const struct proto_ops iucv_sock_ops = {
2328 .family = PF_IUCV,
2329 .owner = THIS_MODULE,
2330 .release = iucv_sock_release,
2331 .bind = iucv_sock_bind,
2332 .connect = iucv_sock_connect,
2333 .listen = iucv_sock_listen,
2334 .accept = iucv_sock_accept,
2335 .getname = iucv_sock_getname,
2336 .sendmsg = iucv_sock_sendmsg,
2337 .recvmsg = iucv_sock_recvmsg,
2338 .poll = iucv_sock_poll,
2339 .ioctl = sock_no_ioctl,
2340 .mmap = sock_no_mmap,
2341 .socketpair = sock_no_socketpair,
2342 .shutdown = iucv_sock_shutdown,
2343 .setsockopt = iucv_sock_setsockopt,
2344 .getsockopt = iucv_sock_getsockopt,
2345 };
2346
2347 static const struct net_proto_family iucv_sock_family_ops = {
2348 .family = AF_IUCV,
2349 .owner = THIS_MODULE,
2350 .create = iucv_sock_create,
2351 };
2352
2353 static struct packet_type iucv_packet_type = {
2354 .type = cpu_to_be16(ETH_P_AF_IUCV),
2355 .func = afiucv_hs_rcv,
2356 };
2357
2358 static int afiucv_iucv_init(void)
2359 {
2360 int err;
2361
2362 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2363 if (err)
2364 goto out;
2365 /* establish dummy device */
2366 af_iucv_driver.bus = pr_iucv->bus;
2367 err = driver_register(&af_iucv_driver);
2368 if (err)
2369 goto out_iucv;
2370 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2371 if (!af_iucv_dev) {
2372 err = -ENOMEM;
2373 goto out_driver;
2374 }
2375 dev_set_name(af_iucv_dev, "af_iucv");
2376 af_iucv_dev->bus = pr_iucv->bus;
2377 af_iucv_dev->parent = pr_iucv->root;
2378 af_iucv_dev->release = (void (*)(struct device *))kfree;
2379 af_iucv_dev->driver = &af_iucv_driver;
2380 err = device_register(af_iucv_dev);
2381 if (err)
2382 goto out_driver;
2383 return 0;
2384
2385 out_driver:
2386 driver_unregister(&af_iucv_driver);
2387 out_iucv:
2388 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2389 out:
2390 return err;
2391 }
2392
2393 static int __init afiucv_init(void)
2394 {
2395 int err;
2396
2397 if (MACHINE_IS_VM) {
2398 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2399 if (unlikely(err)) {
2400 WARN_ON(err);
2401 err = -EPROTONOSUPPORT;
2402 goto out;
2403 }
2404
2405 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2406 if (!pr_iucv) {
2407 printk(KERN_WARNING "iucv_if lookup failed\n");
2408 memset(&iucv_userid, 0, sizeof(iucv_userid));
2409 }
2410 } else {
2411 memset(&iucv_userid, 0, sizeof(iucv_userid));
2412 pr_iucv = NULL;
2413 }
2414
2415 err = proto_register(&iucv_proto, 0);
2416 if (err)
2417 goto out;
2418 err = sock_register(&iucv_sock_family_ops);
2419 if (err)
2420 goto out_proto;
2421
2422 if (pr_iucv) {
2423 err = afiucv_iucv_init();
2424 if (err)
2425 goto out_sock;
2426 } else
2427 register_netdevice_notifier(&afiucv_netdev_notifier);
2428 dev_add_pack(&iucv_packet_type);
2429 return 0;
2430
2431 out_sock:
2432 sock_unregister(PF_IUCV);
2433 out_proto:
2434 proto_unregister(&iucv_proto);
2435 out:
2436 if (pr_iucv)
2437 symbol_put(iucv_if);
2438 return err;
2439 }
2440
2441 static void __exit afiucv_exit(void)
2442 {
2443 if (pr_iucv) {
2444 device_unregister(af_iucv_dev);
2445 driver_unregister(&af_iucv_driver);
2446 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2447 symbol_put(iucv_if);
2448 } else
2449 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2450 dev_remove_pack(&iucv_packet_type);
2451 sock_unregister(PF_IUCV);
2452 proto_unregister(&iucv_proto);
2453 }
2454
2455 module_init(afiucv_init);
2456 module_exit(afiucv_exit);
2457
2458 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2459 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2460 MODULE_VERSION(VERSION);
2461 MODULE_LICENSE("GPL");
2462 MODULE_ALIAS_NETPROTO(PF_IUCV);
2463
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