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net/af_iucv: always register net_device notifier
[mirror_ubuntu-bionic-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/signal.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <asm/ebcdic.h>
28 #include <asm/cpcmd.h>
29 #include <linux/kmod.h>
30
31 #include <net/iucv/af_iucv.h>
32
33 #define VERSION "1.2"
34
35 static char iucv_userid[80];
36
37 static const struct proto_ops iucv_sock_ops;
38
39 static struct proto iucv_proto = {
40 .name = "AF_IUCV",
41 .owner = THIS_MODULE,
42 .obj_size = sizeof(struct iucv_sock),
43 };
44
45 static struct iucv_interface *pr_iucv;
46
47 /* special AF_IUCV IPRM messages */
48 static const u8 iprm_shutdown[8] =
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
50
51 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
52
53 #define __iucv_sock_wait(sk, condition, timeo, ret) \
54 do { \
55 DEFINE_WAIT(__wait); \
56 long __timeo = timeo; \
57 ret = 0; \
58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
59 while (!(condition)) { \
60 if (!__timeo) { \
61 ret = -EAGAIN; \
62 break; \
63 } \
64 if (signal_pending(current)) { \
65 ret = sock_intr_errno(__timeo); \
66 break; \
67 } \
68 release_sock(sk); \
69 __timeo = schedule_timeout(__timeo); \
70 lock_sock(sk); \
71 ret = sock_error(sk); \
72 if (ret) \
73 break; \
74 } \
75 finish_wait(sk_sleep(sk), &__wait); \
76 } while (0)
77
78 #define iucv_sock_wait(sk, condition, timeo) \
79 ({ \
80 int __ret = 0; \
81 if (!(condition)) \
82 __iucv_sock_wait(sk, condition, timeo, __ret); \
83 __ret; \
84 })
85
86 static void iucv_sock_kill(struct sock *sk);
87 static void iucv_sock_close(struct sock *sk);
88 static void iucv_sever_path(struct sock *, int);
89
90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
91 struct packet_type *pt, struct net_device *orig_dev);
92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
93 struct sk_buff *skb, u8 flags);
94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
95
96 /* Call Back functions */
97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
99 static void iucv_callback_connack(struct iucv_path *, u8 *);
100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
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 (skwq_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 = skb_push(skb, sizeof(struct af_iucv_trans_hdr));
326 skb_reset_mac_header(skb);
327 skb_reset_network_header(skb);
328 skb_push(skb, ETH_HLEN);
329 skb_reset_mac_header(skb);
330 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
331
332 phs_hdr->magic = ETH_P_AF_IUCV;
333 phs_hdr->version = 1;
334 phs_hdr->flags = flags;
335 if (flags == AF_IUCV_FLAG_SYN)
336 phs_hdr->window = iucv->msglimit;
337 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
338 confirm_recv = atomic_read(&iucv->msg_recv);
339 phs_hdr->window = confirm_recv;
340 if (confirm_recv)
341 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
342 }
343 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
344 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
345 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
346 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
347 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
348 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
349 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
350 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
351 if (imsg)
352 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
353
354 skb->dev = iucv->hs_dev;
355 if (!skb->dev) {
356 err = -ENODEV;
357 goto err_free;
358 }
359 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
360 err = -ENETDOWN;
361 goto err_free;
362 }
363 if (skb->len > skb->dev->mtu) {
364 if (sock->sk_type == SOCK_SEQPACKET) {
365 err = -EMSGSIZE;
366 goto err_free;
367 }
368 skb_trim(skb, skb->dev->mtu);
369 }
370 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
371 nskb = skb_clone(skb, GFP_ATOMIC);
372 if (!nskb) {
373 err = -ENOMEM;
374 goto err_free;
375 }
376
377 skb_queue_tail(&iucv->send_skb_q, nskb);
378 err = dev_queue_xmit(skb);
379 if (net_xmit_eval(err)) {
380 skb_unlink(nskb, &iucv->send_skb_q);
381 kfree_skb(nskb);
382 } else {
383 atomic_sub(confirm_recv, &iucv->msg_recv);
384 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
385 }
386 return net_xmit_eval(err);
387
388 err_free:
389 kfree_skb(skb);
390 return err;
391 }
392
393 static struct sock *__iucv_get_sock_by_name(char *nm)
394 {
395 struct sock *sk;
396
397 sk_for_each(sk, &iucv_sk_list.head)
398 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
399 return sk;
400
401 return NULL;
402 }
403
404 static void iucv_sock_destruct(struct sock *sk)
405 {
406 skb_queue_purge(&sk->sk_receive_queue);
407 skb_queue_purge(&sk->sk_error_queue);
408
409 sk_mem_reclaim(sk);
410
411 if (!sock_flag(sk, SOCK_DEAD)) {
412 pr_err("Attempt to release alive iucv socket %p\n", sk);
413 return;
414 }
415
416 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
417 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
418 WARN_ON(sk->sk_wmem_queued);
419 WARN_ON(sk->sk_forward_alloc);
420 }
421
422 /* Cleanup Listen */
423 static void iucv_sock_cleanup_listen(struct sock *parent)
424 {
425 struct sock *sk;
426
427 /* Close non-accepted connections */
428 while ((sk = iucv_accept_dequeue(parent, NULL))) {
429 iucv_sock_close(sk);
430 iucv_sock_kill(sk);
431 }
432
433 parent->sk_state = IUCV_CLOSED;
434 }
435
436 /* Kill socket (only if zapped and orphaned) */
437 static void iucv_sock_kill(struct sock *sk)
438 {
439 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
440 return;
441
442 iucv_sock_unlink(&iucv_sk_list, sk);
443 sock_set_flag(sk, SOCK_DEAD);
444 sock_put(sk);
445 }
446
447 /* Terminate an IUCV path */
448 static void iucv_sever_path(struct sock *sk, int with_user_data)
449 {
450 unsigned char user_data[16];
451 struct iucv_sock *iucv = iucv_sk(sk);
452 struct iucv_path *path = iucv->path;
453
454 if (iucv->path) {
455 iucv->path = NULL;
456 if (with_user_data) {
457 low_nmcpy(user_data, iucv->src_name);
458 high_nmcpy(user_data, iucv->dst_name);
459 ASCEBC(user_data, sizeof(user_data));
460 pr_iucv->path_sever(path, user_data);
461 } else
462 pr_iucv->path_sever(path, NULL);
463 iucv_path_free(path);
464 }
465 }
466
467 /* Send controlling flags through an IUCV socket for HIPER transport */
468 static int iucv_send_ctrl(struct sock *sk, u8 flags)
469 {
470 int err = 0;
471 int blen;
472 struct sk_buff *skb;
473 u8 shutdown = 0;
474
475 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
476 if (sk->sk_shutdown & SEND_SHUTDOWN) {
477 /* controlling flags should be sent anyway */
478 shutdown = sk->sk_shutdown;
479 sk->sk_shutdown &= RCV_SHUTDOWN;
480 }
481 skb = sock_alloc_send_skb(sk, blen, 1, &err);
482 if (skb) {
483 skb_reserve(skb, blen);
484 err = afiucv_hs_send(NULL, sk, skb, flags);
485 }
486 if (shutdown)
487 sk->sk_shutdown = shutdown;
488 return err;
489 }
490
491 /* Close an IUCV socket */
492 static void iucv_sock_close(struct sock *sk)
493 {
494 struct iucv_sock *iucv = iucv_sk(sk);
495 unsigned long timeo;
496 int err = 0;
497
498 lock_sock(sk);
499
500 switch (sk->sk_state) {
501 case IUCV_LISTEN:
502 iucv_sock_cleanup_listen(sk);
503 break;
504
505 case IUCV_CONNECTED:
506 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
507 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
508 sk->sk_state = IUCV_DISCONN;
509 sk->sk_state_change(sk);
510 }
511 case IUCV_DISCONN: /* fall through */
512 sk->sk_state = IUCV_CLOSING;
513 sk->sk_state_change(sk);
514
515 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
516 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
517 timeo = sk->sk_lingertime;
518 else
519 timeo = IUCV_DISCONN_TIMEOUT;
520 iucv_sock_wait(sk,
521 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
522 timeo);
523 }
524
525 case IUCV_CLOSING: /* fall through */
526 sk->sk_state = IUCV_CLOSED;
527 sk->sk_state_change(sk);
528
529 sk->sk_err = ECONNRESET;
530 sk->sk_state_change(sk);
531
532 skb_queue_purge(&iucv->send_skb_q);
533 skb_queue_purge(&iucv->backlog_skb_q);
534
535 default: /* fall through */
536 iucv_sever_path(sk, 1);
537 }
538
539 if (iucv->hs_dev) {
540 dev_put(iucv->hs_dev);
541 iucv->hs_dev = NULL;
542 sk->sk_bound_dev_if = 0;
543 }
544
545 /* mark socket for deletion by iucv_sock_kill() */
546 sock_set_flag(sk, SOCK_ZAPPED);
547
548 release_sock(sk);
549 }
550
551 static void iucv_sock_init(struct sock *sk, struct sock *parent)
552 {
553 if (parent) {
554 sk->sk_type = parent->sk_type;
555 security_sk_clone(parent, sk);
556 }
557 }
558
559 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
560 {
561 struct sock *sk;
562 struct iucv_sock *iucv;
563
564 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
565 if (!sk)
566 return NULL;
567 iucv = iucv_sk(sk);
568
569 sock_init_data(sock, sk);
570 INIT_LIST_HEAD(&iucv->accept_q);
571 spin_lock_init(&iucv->accept_q_lock);
572 skb_queue_head_init(&iucv->send_skb_q);
573 INIT_LIST_HEAD(&iucv->message_q.list);
574 spin_lock_init(&iucv->message_q.lock);
575 skb_queue_head_init(&iucv->backlog_skb_q);
576 iucv->send_tag = 0;
577 atomic_set(&iucv->pendings, 0);
578 iucv->flags = 0;
579 iucv->msglimit = 0;
580 atomic_set(&iucv->msg_sent, 0);
581 atomic_set(&iucv->msg_recv, 0);
582 iucv->path = NULL;
583 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
584 memset(&iucv->src_user_id , 0, 32);
585 if (pr_iucv)
586 iucv->transport = AF_IUCV_TRANS_IUCV;
587 else
588 iucv->transport = AF_IUCV_TRANS_HIPER;
589
590 sk->sk_destruct = iucv_sock_destruct;
591 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
592 sk->sk_allocation = GFP_DMA;
593
594 sock_reset_flag(sk, SOCK_ZAPPED);
595
596 sk->sk_protocol = proto;
597 sk->sk_state = IUCV_OPEN;
598
599 iucv_sock_link(&iucv_sk_list, sk);
600 return sk;
601 }
602
603 /* Create an IUCV socket */
604 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
605 int kern)
606 {
607 struct sock *sk;
608
609 if (protocol && protocol != PF_IUCV)
610 return -EPROTONOSUPPORT;
611
612 sock->state = SS_UNCONNECTED;
613
614 switch (sock->type) {
615 case SOCK_STREAM:
616 sock->ops = &iucv_sock_ops;
617 break;
618 case SOCK_SEQPACKET:
619 /* currently, proto ops can handle both sk types */
620 sock->ops = &iucv_sock_ops;
621 break;
622 default:
623 return -ESOCKTNOSUPPORT;
624 }
625
626 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
627 if (!sk)
628 return -ENOMEM;
629
630 iucv_sock_init(sk, NULL);
631
632 return 0;
633 }
634
635 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
636 {
637 write_lock_bh(&l->lock);
638 sk_add_node(sk, &l->head);
639 write_unlock_bh(&l->lock);
640 }
641
642 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
643 {
644 write_lock_bh(&l->lock);
645 sk_del_node_init(sk);
646 write_unlock_bh(&l->lock);
647 }
648
649 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
650 {
651 unsigned long flags;
652 struct iucv_sock *par = iucv_sk(parent);
653
654 sock_hold(sk);
655 spin_lock_irqsave(&par->accept_q_lock, flags);
656 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
657 spin_unlock_irqrestore(&par->accept_q_lock, flags);
658 iucv_sk(sk)->parent = parent;
659 sk_acceptq_added(parent);
660 }
661
662 void iucv_accept_unlink(struct sock *sk)
663 {
664 unsigned long flags;
665 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
666
667 spin_lock_irqsave(&par->accept_q_lock, flags);
668 list_del_init(&iucv_sk(sk)->accept_q);
669 spin_unlock_irqrestore(&par->accept_q_lock, flags);
670 sk_acceptq_removed(iucv_sk(sk)->parent);
671 iucv_sk(sk)->parent = NULL;
672 sock_put(sk);
673 }
674
675 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
676 {
677 struct iucv_sock *isk, *n;
678 struct sock *sk;
679
680 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
681 sk = (struct sock *) isk;
682 lock_sock(sk);
683
684 if (sk->sk_state == IUCV_CLOSED) {
685 iucv_accept_unlink(sk);
686 release_sock(sk);
687 continue;
688 }
689
690 if (sk->sk_state == IUCV_CONNECTED ||
691 sk->sk_state == IUCV_DISCONN ||
692 !newsock) {
693 iucv_accept_unlink(sk);
694 if (newsock)
695 sock_graft(sk, newsock);
696
697 release_sock(sk);
698 return sk;
699 }
700
701 release_sock(sk);
702 }
703 return NULL;
704 }
705
706 static void __iucv_auto_name(struct iucv_sock *iucv)
707 {
708 char name[12];
709
710 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
711 while (__iucv_get_sock_by_name(name)) {
712 sprintf(name, "%08x",
713 atomic_inc_return(&iucv_sk_list.autobind_name));
714 }
715 memcpy(iucv->src_name, name, 8);
716 }
717
718 /* Bind an unbound socket */
719 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
720 int addr_len)
721 {
722 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
723 struct sock *sk = sock->sk;
724 struct iucv_sock *iucv;
725 int err = 0;
726 struct net_device *dev;
727 char uid[9];
728
729 /* Verify the input sockaddr */
730 if (addr_len < sizeof(struct sockaddr_iucv) ||
731 addr->sa_family != AF_IUCV)
732 return -EINVAL;
733
734 lock_sock(sk);
735 if (sk->sk_state != IUCV_OPEN) {
736 err = -EBADFD;
737 goto done;
738 }
739
740 write_lock_bh(&iucv_sk_list.lock);
741
742 iucv = iucv_sk(sk);
743 if (__iucv_get_sock_by_name(sa->siucv_name)) {
744 err = -EADDRINUSE;
745 goto done_unlock;
746 }
747 if (iucv->path)
748 goto done_unlock;
749
750 /* Bind the socket */
751 if (pr_iucv)
752 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
753 goto vm_bind; /* VM IUCV transport */
754
755 /* try hiper transport */
756 memcpy(uid, sa->siucv_user_id, sizeof(uid));
757 ASCEBC(uid, 8);
758 rcu_read_lock();
759 for_each_netdev_rcu(&init_net, dev) {
760 if (!memcmp(dev->perm_addr, uid, 8)) {
761 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
762 /* Check for unitialized siucv_name */
763 if (strncmp(sa->siucv_name, " ", 8) == 0)
764 __iucv_auto_name(iucv);
765 else
766 memcpy(iucv->src_name, sa->siucv_name, 8);
767 sk->sk_bound_dev_if = dev->ifindex;
768 iucv->hs_dev = dev;
769 dev_hold(dev);
770 sk->sk_state = IUCV_BOUND;
771 iucv->transport = AF_IUCV_TRANS_HIPER;
772 if (!iucv->msglimit)
773 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
774 rcu_read_unlock();
775 goto done_unlock;
776 }
777 }
778 rcu_read_unlock();
779 vm_bind:
780 if (pr_iucv) {
781 /* use local userid for backward compat */
782 memcpy(iucv->src_name, sa->siucv_name, 8);
783 memcpy(iucv->src_user_id, iucv_userid, 8);
784 sk->sk_state = IUCV_BOUND;
785 iucv->transport = AF_IUCV_TRANS_IUCV;
786 if (!iucv->msglimit)
787 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
788 goto done_unlock;
789 }
790 /* found no dev to bind */
791 err = -ENODEV;
792 done_unlock:
793 /* Release the socket list lock */
794 write_unlock_bh(&iucv_sk_list.lock);
795 done:
796 release_sock(sk);
797 return err;
798 }
799
800 /* Automatically bind an unbound socket */
801 static int iucv_sock_autobind(struct sock *sk)
802 {
803 struct iucv_sock *iucv = iucv_sk(sk);
804 int err = 0;
805
806 if (unlikely(!pr_iucv))
807 return -EPROTO;
808
809 memcpy(iucv->src_user_id, iucv_userid, 8);
810
811 write_lock_bh(&iucv_sk_list.lock);
812 __iucv_auto_name(iucv);
813 write_unlock_bh(&iucv_sk_list.lock);
814
815 if (!iucv->msglimit)
816 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
817
818 return err;
819 }
820
821 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
822 {
823 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
824 struct sock *sk = sock->sk;
825 struct iucv_sock *iucv = iucv_sk(sk);
826 unsigned char user_data[16];
827 int err;
828
829 high_nmcpy(user_data, sa->siucv_name);
830 low_nmcpy(user_data, iucv->src_name);
831 ASCEBC(user_data, sizeof(user_data));
832
833 /* Create path. */
834 iucv->path = iucv_path_alloc(iucv->msglimit,
835 IUCV_IPRMDATA, GFP_KERNEL);
836 if (!iucv->path) {
837 err = -ENOMEM;
838 goto done;
839 }
840 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
841 sa->siucv_user_id, NULL, user_data,
842 sk);
843 if (err) {
844 iucv_path_free(iucv->path);
845 iucv->path = NULL;
846 switch (err) {
847 case 0x0b: /* Target communicator is not logged on */
848 err = -ENETUNREACH;
849 break;
850 case 0x0d: /* Max connections for this guest exceeded */
851 case 0x0e: /* Max connections for target guest exceeded */
852 err = -EAGAIN;
853 break;
854 case 0x0f: /* Missing IUCV authorization */
855 err = -EACCES;
856 break;
857 default:
858 err = -ECONNREFUSED;
859 break;
860 }
861 }
862 done:
863 return err;
864 }
865
866 /* Connect an unconnected socket */
867 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
868 int alen, int flags)
869 {
870 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
871 struct sock *sk = sock->sk;
872 struct iucv_sock *iucv = iucv_sk(sk);
873 int err;
874
875 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
876 return -EINVAL;
877
878 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
879 return -EBADFD;
880
881 if (sk->sk_state == IUCV_OPEN &&
882 iucv->transport == AF_IUCV_TRANS_HIPER)
883 return -EBADFD; /* explicit bind required */
884
885 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
886 return -EINVAL;
887
888 if (sk->sk_state == IUCV_OPEN) {
889 err = iucv_sock_autobind(sk);
890 if (unlikely(err))
891 return err;
892 }
893
894 lock_sock(sk);
895
896 /* Set the destination information */
897 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
898 memcpy(iucv->dst_name, sa->siucv_name, 8);
899
900 if (iucv->transport == AF_IUCV_TRANS_HIPER)
901 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
902 else
903 err = afiucv_path_connect(sock, addr);
904 if (err)
905 goto done;
906
907 if (sk->sk_state != IUCV_CONNECTED)
908 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
909 IUCV_DISCONN),
910 sock_sndtimeo(sk, flags & O_NONBLOCK));
911
912 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
913 err = -ECONNREFUSED;
914
915 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
916 iucv_sever_path(sk, 0);
917
918 done:
919 release_sock(sk);
920 return err;
921 }
922
923 /* Move a socket into listening state. */
924 static int iucv_sock_listen(struct socket *sock, int backlog)
925 {
926 struct sock *sk = sock->sk;
927 int err;
928
929 lock_sock(sk);
930
931 err = -EINVAL;
932 if (sk->sk_state != IUCV_BOUND)
933 goto done;
934
935 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
936 goto done;
937
938 sk->sk_max_ack_backlog = backlog;
939 sk->sk_ack_backlog = 0;
940 sk->sk_state = IUCV_LISTEN;
941 err = 0;
942
943 done:
944 release_sock(sk);
945 return err;
946 }
947
948 /* Accept a pending connection */
949 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
950 int flags, bool kern)
951 {
952 DECLARE_WAITQUEUE(wait, current);
953 struct sock *sk = sock->sk, *nsk;
954 long timeo;
955 int err = 0;
956
957 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
958
959 if (sk->sk_state != IUCV_LISTEN) {
960 err = -EBADFD;
961 goto done;
962 }
963
964 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
965
966 /* Wait for an incoming connection */
967 add_wait_queue_exclusive(sk_sleep(sk), &wait);
968 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
969 set_current_state(TASK_INTERRUPTIBLE);
970 if (!timeo) {
971 err = -EAGAIN;
972 break;
973 }
974
975 release_sock(sk);
976 timeo = schedule_timeout(timeo);
977 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
978
979 if (sk->sk_state != IUCV_LISTEN) {
980 err = -EBADFD;
981 break;
982 }
983
984 if (signal_pending(current)) {
985 err = sock_intr_errno(timeo);
986 break;
987 }
988 }
989
990 set_current_state(TASK_RUNNING);
991 remove_wait_queue(sk_sleep(sk), &wait);
992
993 if (err)
994 goto done;
995
996 newsock->state = SS_CONNECTED;
997
998 done:
999 release_sock(sk);
1000 return err;
1001 }
1002
1003 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
1004 int *len, int peer)
1005 {
1006 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
1007 struct sock *sk = sock->sk;
1008 struct iucv_sock *iucv = iucv_sk(sk);
1009
1010 addr->sa_family = AF_IUCV;
1011 *len = sizeof(struct sockaddr_iucv);
1012
1013 if (peer) {
1014 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1015 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1016 } else {
1017 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1018 memcpy(siucv->siucv_name, iucv->src_name, 8);
1019 }
1020 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1021 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1022 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1023
1024 return 0;
1025 }
1026
1027 /**
1028 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1029 * @path: IUCV path
1030 * @msg: Pointer to a struct iucv_message
1031 * @skb: The socket data to send, skb->len MUST BE <= 7
1032 *
1033 * Send the socket data in the parameter list in the iucv message
1034 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1035 * list and the socket data len at index 7 (last byte).
1036 * See also iucv_msg_length().
1037 *
1038 * Returns the error code from the iucv_message_send() call.
1039 */
1040 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1041 struct sk_buff *skb)
1042 {
1043 u8 prmdata[8];
1044
1045 memcpy(prmdata, (void *) skb->data, skb->len);
1046 prmdata[7] = 0xff - (u8) skb->len;
1047 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1048 (void *) prmdata, 8);
1049 }
1050
1051 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1052 size_t len)
1053 {
1054 struct sock *sk = sock->sk;
1055 struct iucv_sock *iucv = iucv_sk(sk);
1056 size_t headroom = 0;
1057 size_t linear;
1058 struct sk_buff *skb;
1059 struct iucv_message txmsg = {0};
1060 struct cmsghdr *cmsg;
1061 int cmsg_done;
1062 long timeo;
1063 char user_id[9];
1064 char appl_id[9];
1065 int err;
1066 int noblock = msg->msg_flags & MSG_DONTWAIT;
1067
1068 err = sock_error(sk);
1069 if (err)
1070 return err;
1071
1072 if (msg->msg_flags & MSG_OOB)
1073 return -EOPNOTSUPP;
1074
1075 /* SOCK_SEQPACKET: we do not support segmented records */
1076 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1077 return -EOPNOTSUPP;
1078
1079 lock_sock(sk);
1080
1081 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1082 err = -EPIPE;
1083 goto out;
1084 }
1085
1086 /* Return if the socket is not in connected state */
1087 if (sk->sk_state != IUCV_CONNECTED) {
1088 err = -ENOTCONN;
1089 goto out;
1090 }
1091
1092 /* initialize defaults */
1093 cmsg_done = 0; /* check for duplicate headers */
1094 txmsg.class = 0;
1095
1096 /* iterate over control messages */
1097 for_each_cmsghdr(cmsg, msg) {
1098 if (!CMSG_OK(msg, cmsg)) {
1099 err = -EINVAL;
1100 goto out;
1101 }
1102
1103 if (cmsg->cmsg_level != SOL_IUCV)
1104 continue;
1105
1106 if (cmsg->cmsg_type & cmsg_done) {
1107 err = -EINVAL;
1108 goto out;
1109 }
1110 cmsg_done |= cmsg->cmsg_type;
1111
1112 switch (cmsg->cmsg_type) {
1113 case SCM_IUCV_TRGCLS:
1114 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1115 err = -EINVAL;
1116 goto out;
1117 }
1118
1119 /* set iucv message target class */
1120 memcpy(&txmsg.class,
1121 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1122
1123 break;
1124
1125 default:
1126 err = -EINVAL;
1127 goto out;
1128 }
1129 }
1130
1131 /* allocate one skb for each iucv message:
1132 * this is fine for SOCK_SEQPACKET (unless we want to support
1133 * segmented records using the MSG_EOR flag), but
1134 * for SOCK_STREAM we might want to improve it in future */
1135 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1136 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1137 linear = len;
1138 } else {
1139 if (len < PAGE_SIZE) {
1140 linear = len;
1141 } else {
1142 /* In nonlinear "classic" iucv skb,
1143 * reserve space for iucv_array
1144 */
1145 headroom = sizeof(struct iucv_array) *
1146 (MAX_SKB_FRAGS + 1);
1147 linear = PAGE_SIZE - headroom;
1148 }
1149 }
1150 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1151 noblock, &err, 0);
1152 if (!skb)
1153 goto out;
1154 if (headroom)
1155 skb_reserve(skb, headroom);
1156 skb_put(skb, linear);
1157 skb->len = len;
1158 skb->data_len = len - linear;
1159 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1160 if (err)
1161 goto fail;
1162
1163 /* wait if outstanding messages for iucv path has reached */
1164 timeo = sock_sndtimeo(sk, noblock);
1165 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1166 if (err)
1167 goto fail;
1168
1169 /* return -ECONNRESET if the socket is no longer connected */
1170 if (sk->sk_state != IUCV_CONNECTED) {
1171 err = -ECONNRESET;
1172 goto fail;
1173 }
1174
1175 /* increment and save iucv message tag for msg_completion cbk */
1176 txmsg.tag = iucv->send_tag++;
1177 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1178
1179 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1180 atomic_inc(&iucv->msg_sent);
1181 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1182 if (err) {
1183 atomic_dec(&iucv->msg_sent);
1184 goto out;
1185 }
1186 } else { /* Classic VM IUCV transport */
1187 skb_queue_tail(&iucv->send_skb_q, skb);
1188
1189 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1190 skb->len <= 7) {
1191 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1192
1193 /* on success: there is no message_complete callback */
1194 /* for an IPRMDATA msg; remove skb from send queue */
1195 if (err == 0) {
1196 skb_unlink(skb, &iucv->send_skb_q);
1197 kfree_skb(skb);
1198 }
1199
1200 /* this error should never happen since the */
1201 /* IUCV_IPRMDATA path flag is set... sever path */
1202 if (err == 0x15) {
1203 pr_iucv->path_sever(iucv->path, NULL);
1204 skb_unlink(skb, &iucv->send_skb_q);
1205 err = -EPIPE;
1206 goto fail;
1207 }
1208 } else if (skb_is_nonlinear(skb)) {
1209 struct iucv_array *iba = (struct iucv_array *)skb->head;
1210 int i;
1211
1212 /* skip iucv_array lying in the headroom */
1213 iba[0].address = (u32)(addr_t)skb->data;
1214 iba[0].length = (u32)skb_headlen(skb);
1215 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1216 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1217
1218 iba[i + 1].address =
1219 (u32)(addr_t)skb_frag_address(frag);
1220 iba[i + 1].length = (u32)skb_frag_size(frag);
1221 }
1222 err = pr_iucv->message_send(iucv->path, &txmsg,
1223 IUCV_IPBUFLST, 0,
1224 (void *)iba, skb->len);
1225 } else { /* non-IPRM Linear skb */
1226 err = pr_iucv->message_send(iucv->path, &txmsg,
1227 0, 0, (void *)skb->data, skb->len);
1228 }
1229 if (err) {
1230 if (err == 3) {
1231 user_id[8] = 0;
1232 memcpy(user_id, iucv->dst_user_id, 8);
1233 appl_id[8] = 0;
1234 memcpy(appl_id, iucv->dst_name, 8);
1235 pr_err(
1236 "Application %s on z/VM guest %s exceeds message limit\n",
1237 appl_id, user_id);
1238 err = -EAGAIN;
1239 } else {
1240 err = -EPIPE;
1241 }
1242 skb_unlink(skb, &iucv->send_skb_q);
1243 goto fail;
1244 }
1245 }
1246
1247 release_sock(sk);
1248 return len;
1249
1250 fail:
1251 kfree_skb(skb);
1252 out:
1253 release_sock(sk);
1254 return err;
1255 }
1256
1257 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1258 {
1259 size_t headroom, linear;
1260 struct sk_buff *skb;
1261 int err;
1262
1263 if (len < PAGE_SIZE) {
1264 headroom = 0;
1265 linear = len;
1266 } else {
1267 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1268 linear = PAGE_SIZE - headroom;
1269 }
1270 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1271 0, &err, GFP_ATOMIC | GFP_DMA);
1272 WARN_ONCE(!skb,
1273 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1274 len, err);
1275 if (skb) {
1276 if (headroom)
1277 skb_reserve(skb, headroom);
1278 skb_put(skb, linear);
1279 skb->len = len;
1280 skb->data_len = len - linear;
1281 }
1282 return skb;
1283 }
1284
1285 /* iucv_process_message() - Receive a single outstanding IUCV message
1286 *
1287 * Locking: must be called with message_q.lock held
1288 */
1289 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1290 struct iucv_path *path,
1291 struct iucv_message *msg)
1292 {
1293 int rc;
1294 unsigned int len;
1295
1296 len = iucv_msg_length(msg);
1297
1298 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1299 /* Note: the first 4 bytes are reserved for msg tag */
1300 IUCV_SKB_CB(skb)->class = msg->class;
1301
1302 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1303 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1304 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1305 skb->data = NULL;
1306 skb->len = 0;
1307 }
1308 } else {
1309 if (skb_is_nonlinear(skb)) {
1310 struct iucv_array *iba = (struct iucv_array *)skb->head;
1311 int i;
1312
1313 iba[0].address = (u32)(addr_t)skb->data;
1314 iba[0].length = (u32)skb_headlen(skb);
1315 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1316 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1317
1318 iba[i + 1].address =
1319 (u32)(addr_t)skb_frag_address(frag);
1320 iba[i + 1].length = (u32)skb_frag_size(frag);
1321 }
1322 rc = pr_iucv->message_receive(path, msg,
1323 IUCV_IPBUFLST,
1324 (void *)iba, len, NULL);
1325 } else {
1326 rc = pr_iucv->message_receive(path, msg,
1327 msg->flags & IUCV_IPRMDATA,
1328 skb->data, len, NULL);
1329 }
1330 if (rc) {
1331 kfree_skb(skb);
1332 return;
1333 }
1334 WARN_ON_ONCE(skb->len != len);
1335 }
1336
1337 IUCV_SKB_CB(skb)->offset = 0;
1338 if (sk_filter(sk, skb)) {
1339 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1340 kfree_skb(skb);
1341 return;
1342 }
1343 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1344 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1345 }
1346
1347 /* iucv_process_message_q() - Process outstanding IUCV messages
1348 *
1349 * Locking: must be called with message_q.lock held
1350 */
1351 static void iucv_process_message_q(struct sock *sk)
1352 {
1353 struct iucv_sock *iucv = iucv_sk(sk);
1354 struct sk_buff *skb;
1355 struct sock_msg_q *p, *n;
1356
1357 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1358 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1359 if (!skb)
1360 break;
1361 iucv_process_message(sk, skb, p->path, &p->msg);
1362 list_del(&p->list);
1363 kfree(p);
1364 if (!skb_queue_empty(&iucv->backlog_skb_q))
1365 break;
1366 }
1367 }
1368
1369 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1370 size_t len, int flags)
1371 {
1372 int noblock = flags & MSG_DONTWAIT;
1373 struct sock *sk = sock->sk;
1374 struct iucv_sock *iucv = iucv_sk(sk);
1375 unsigned int copied, rlen;
1376 struct sk_buff *skb, *rskb, *cskb;
1377 int err = 0;
1378 u32 offset;
1379
1380 if ((sk->sk_state == IUCV_DISCONN) &&
1381 skb_queue_empty(&iucv->backlog_skb_q) &&
1382 skb_queue_empty(&sk->sk_receive_queue) &&
1383 list_empty(&iucv->message_q.list))
1384 return 0;
1385
1386 if (flags & (MSG_OOB))
1387 return -EOPNOTSUPP;
1388
1389 /* receive/dequeue next skb:
1390 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1391 skb = skb_recv_datagram(sk, flags, noblock, &err);
1392 if (!skb) {
1393 if (sk->sk_shutdown & RCV_SHUTDOWN)
1394 return 0;
1395 return err;
1396 }
1397
1398 offset = IUCV_SKB_CB(skb)->offset;
1399 rlen = skb->len - offset; /* real length of skb */
1400 copied = min_t(unsigned int, rlen, len);
1401 if (!rlen)
1402 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1403
1404 cskb = skb;
1405 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1406 if (!(flags & MSG_PEEK))
1407 skb_queue_head(&sk->sk_receive_queue, skb);
1408 return -EFAULT;
1409 }
1410
1411 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1412 if (sk->sk_type == SOCK_SEQPACKET) {
1413 if (copied < rlen)
1414 msg->msg_flags |= MSG_TRUNC;
1415 /* each iucv message contains a complete record */
1416 msg->msg_flags |= MSG_EOR;
1417 }
1418
1419 /* create control message to store iucv msg target class:
1420 * get the trgcls from the control buffer of the skb due to
1421 * fragmentation of original iucv message. */
1422 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1423 sizeof(IUCV_SKB_CB(skb)->class),
1424 (void *)&IUCV_SKB_CB(skb)->class);
1425 if (err) {
1426 if (!(flags & MSG_PEEK))
1427 skb_queue_head(&sk->sk_receive_queue, skb);
1428 return err;
1429 }
1430
1431 /* Mark read part of skb as used */
1432 if (!(flags & MSG_PEEK)) {
1433
1434 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1435 if (sk->sk_type == SOCK_STREAM) {
1436 if (copied < rlen) {
1437 IUCV_SKB_CB(skb)->offset = offset + copied;
1438 skb_queue_head(&sk->sk_receive_queue, skb);
1439 goto done;
1440 }
1441 }
1442
1443 kfree_skb(skb);
1444 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1445 atomic_inc(&iucv->msg_recv);
1446 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1447 WARN_ON(1);
1448 iucv_sock_close(sk);
1449 return -EFAULT;
1450 }
1451 }
1452
1453 /* Queue backlog skbs */
1454 spin_lock_bh(&iucv->message_q.lock);
1455 rskb = skb_dequeue(&iucv->backlog_skb_q);
1456 while (rskb) {
1457 IUCV_SKB_CB(rskb)->offset = 0;
1458 if (__sock_queue_rcv_skb(sk, rskb)) {
1459 /* handle rcv queue full */
1460 skb_queue_head(&iucv->backlog_skb_q,
1461 rskb);
1462 break;
1463 }
1464 rskb = skb_dequeue(&iucv->backlog_skb_q);
1465 }
1466 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1467 if (!list_empty(&iucv->message_q.list))
1468 iucv_process_message_q(sk);
1469 if (atomic_read(&iucv->msg_recv) >=
1470 iucv->msglimit / 2) {
1471 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1472 if (err) {
1473 sk->sk_state = IUCV_DISCONN;
1474 sk->sk_state_change(sk);
1475 }
1476 }
1477 }
1478 spin_unlock_bh(&iucv->message_q.lock);
1479 }
1480
1481 done:
1482 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1483 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1484 copied = rlen;
1485
1486 return copied;
1487 }
1488
1489 static inline unsigned int iucv_accept_poll(struct sock *parent)
1490 {
1491 struct iucv_sock *isk, *n;
1492 struct sock *sk;
1493
1494 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1495 sk = (struct sock *) isk;
1496
1497 if (sk->sk_state == IUCV_CONNECTED)
1498 return POLLIN | POLLRDNORM;
1499 }
1500
1501 return 0;
1502 }
1503
1504 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1505 poll_table *wait)
1506 {
1507 struct sock *sk = sock->sk;
1508 unsigned int mask = 0;
1509
1510 sock_poll_wait(file, sk_sleep(sk), wait);
1511
1512 if (sk->sk_state == IUCV_LISTEN)
1513 return iucv_accept_poll(sk);
1514
1515 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1516 mask |= POLLERR |
1517 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1518
1519 if (sk->sk_shutdown & RCV_SHUTDOWN)
1520 mask |= POLLRDHUP;
1521
1522 if (sk->sk_shutdown == SHUTDOWN_MASK)
1523 mask |= POLLHUP;
1524
1525 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1526 (sk->sk_shutdown & RCV_SHUTDOWN))
1527 mask |= POLLIN | POLLRDNORM;
1528
1529 if (sk->sk_state == IUCV_CLOSED)
1530 mask |= POLLHUP;
1531
1532 if (sk->sk_state == IUCV_DISCONN)
1533 mask |= POLLIN;
1534
1535 if (sock_writeable(sk) && iucv_below_msglim(sk))
1536 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1537 else
1538 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1539
1540 return mask;
1541 }
1542
1543 static int iucv_sock_shutdown(struct socket *sock, int how)
1544 {
1545 struct sock *sk = sock->sk;
1546 struct iucv_sock *iucv = iucv_sk(sk);
1547 struct iucv_message txmsg;
1548 int err = 0;
1549
1550 how++;
1551
1552 if ((how & ~SHUTDOWN_MASK) || !how)
1553 return -EINVAL;
1554
1555 lock_sock(sk);
1556 switch (sk->sk_state) {
1557 case IUCV_LISTEN:
1558 case IUCV_DISCONN:
1559 case IUCV_CLOSING:
1560 case IUCV_CLOSED:
1561 err = -ENOTCONN;
1562 goto fail;
1563 default:
1564 break;
1565 }
1566
1567 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1568 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1569 txmsg.class = 0;
1570 txmsg.tag = 0;
1571 err = pr_iucv->message_send(iucv->path, &txmsg,
1572 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1573 if (err) {
1574 switch (err) {
1575 case 1:
1576 err = -ENOTCONN;
1577 break;
1578 case 2:
1579 err = -ECONNRESET;
1580 break;
1581 default:
1582 err = -ENOTCONN;
1583 break;
1584 }
1585 }
1586 } else
1587 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1588 }
1589
1590 sk->sk_shutdown |= how;
1591 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1592 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1593 iucv->path) {
1594 err = pr_iucv->path_quiesce(iucv->path, NULL);
1595 if (err)
1596 err = -ENOTCONN;
1597 /* skb_queue_purge(&sk->sk_receive_queue); */
1598 }
1599 skb_queue_purge(&sk->sk_receive_queue);
1600 }
1601
1602 /* Wake up anyone sleeping in poll */
1603 sk->sk_state_change(sk);
1604
1605 fail:
1606 release_sock(sk);
1607 return err;
1608 }
1609
1610 static int iucv_sock_release(struct socket *sock)
1611 {
1612 struct sock *sk = sock->sk;
1613 int err = 0;
1614
1615 if (!sk)
1616 return 0;
1617
1618 iucv_sock_close(sk);
1619
1620 sock_orphan(sk);
1621 iucv_sock_kill(sk);
1622 return err;
1623 }
1624
1625 /* getsockopt and setsockopt */
1626 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1627 char __user *optval, unsigned int optlen)
1628 {
1629 struct sock *sk = sock->sk;
1630 struct iucv_sock *iucv = iucv_sk(sk);
1631 int val;
1632 int rc;
1633
1634 if (level != SOL_IUCV)
1635 return -ENOPROTOOPT;
1636
1637 if (optlen < sizeof(int))
1638 return -EINVAL;
1639
1640 if (get_user(val, (int __user *) optval))
1641 return -EFAULT;
1642
1643 rc = 0;
1644
1645 lock_sock(sk);
1646 switch (optname) {
1647 case SO_IPRMDATA_MSG:
1648 if (val)
1649 iucv->flags |= IUCV_IPRMDATA;
1650 else
1651 iucv->flags &= ~IUCV_IPRMDATA;
1652 break;
1653 case SO_MSGLIMIT:
1654 switch (sk->sk_state) {
1655 case IUCV_OPEN:
1656 case IUCV_BOUND:
1657 if (val < 1 || val > (u16)(~0))
1658 rc = -EINVAL;
1659 else
1660 iucv->msglimit = val;
1661 break;
1662 default:
1663 rc = -EINVAL;
1664 break;
1665 }
1666 break;
1667 default:
1668 rc = -ENOPROTOOPT;
1669 break;
1670 }
1671 release_sock(sk);
1672
1673 return rc;
1674 }
1675
1676 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1677 char __user *optval, int __user *optlen)
1678 {
1679 struct sock *sk = sock->sk;
1680 struct iucv_sock *iucv = iucv_sk(sk);
1681 unsigned int val;
1682 int len;
1683
1684 if (level != SOL_IUCV)
1685 return -ENOPROTOOPT;
1686
1687 if (get_user(len, optlen))
1688 return -EFAULT;
1689
1690 if (len < 0)
1691 return -EINVAL;
1692
1693 len = min_t(unsigned int, len, sizeof(int));
1694
1695 switch (optname) {
1696 case SO_IPRMDATA_MSG:
1697 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1698 break;
1699 case SO_MSGLIMIT:
1700 lock_sock(sk);
1701 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1702 : iucv->msglimit; /* default */
1703 release_sock(sk);
1704 break;
1705 case SO_MSGSIZE:
1706 if (sk->sk_state == IUCV_OPEN)
1707 return -EBADFD;
1708 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1709 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1710 0x7fffffff;
1711 break;
1712 default:
1713 return -ENOPROTOOPT;
1714 }
1715
1716 if (put_user(len, optlen))
1717 return -EFAULT;
1718 if (copy_to_user(optval, &val, len))
1719 return -EFAULT;
1720
1721 return 0;
1722 }
1723
1724
1725 /* Callback wrappers - called from iucv base support */
1726 static int iucv_callback_connreq(struct iucv_path *path,
1727 u8 ipvmid[8], u8 ipuser[16])
1728 {
1729 unsigned char user_data[16];
1730 unsigned char nuser_data[16];
1731 unsigned char src_name[8];
1732 struct sock *sk, *nsk;
1733 struct iucv_sock *iucv, *niucv;
1734 int err;
1735
1736 memcpy(src_name, ipuser, 8);
1737 EBCASC(src_name, 8);
1738 /* Find out if this path belongs to af_iucv. */
1739 read_lock(&iucv_sk_list.lock);
1740 iucv = NULL;
1741 sk = NULL;
1742 sk_for_each(sk, &iucv_sk_list.head)
1743 if (sk->sk_state == IUCV_LISTEN &&
1744 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1745 /*
1746 * Found a listening socket with
1747 * src_name == ipuser[0-7].
1748 */
1749 iucv = iucv_sk(sk);
1750 break;
1751 }
1752 read_unlock(&iucv_sk_list.lock);
1753 if (!iucv)
1754 /* No socket found, not one of our paths. */
1755 return -EINVAL;
1756
1757 bh_lock_sock(sk);
1758
1759 /* Check if parent socket is listening */
1760 low_nmcpy(user_data, iucv->src_name);
1761 high_nmcpy(user_data, iucv->dst_name);
1762 ASCEBC(user_data, sizeof(user_data));
1763 if (sk->sk_state != IUCV_LISTEN) {
1764 err = pr_iucv->path_sever(path, user_data);
1765 iucv_path_free(path);
1766 goto fail;
1767 }
1768
1769 /* Check for backlog size */
1770 if (sk_acceptq_is_full(sk)) {
1771 err = pr_iucv->path_sever(path, user_data);
1772 iucv_path_free(path);
1773 goto fail;
1774 }
1775
1776 /* Create the new socket */
1777 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1778 if (!nsk) {
1779 err = pr_iucv->path_sever(path, user_data);
1780 iucv_path_free(path);
1781 goto fail;
1782 }
1783
1784 niucv = iucv_sk(nsk);
1785 iucv_sock_init(nsk, sk);
1786
1787 /* Set the new iucv_sock */
1788 memcpy(niucv->dst_name, ipuser + 8, 8);
1789 EBCASC(niucv->dst_name, 8);
1790 memcpy(niucv->dst_user_id, ipvmid, 8);
1791 memcpy(niucv->src_name, iucv->src_name, 8);
1792 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1793 niucv->path = path;
1794
1795 /* Call iucv_accept */
1796 high_nmcpy(nuser_data, ipuser + 8);
1797 memcpy(nuser_data + 8, niucv->src_name, 8);
1798 ASCEBC(nuser_data + 8, 8);
1799
1800 /* set message limit for path based on msglimit of accepting socket */
1801 niucv->msglimit = iucv->msglimit;
1802 path->msglim = iucv->msglimit;
1803 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1804 if (err) {
1805 iucv_sever_path(nsk, 1);
1806 iucv_sock_kill(nsk);
1807 goto fail;
1808 }
1809
1810 iucv_accept_enqueue(sk, nsk);
1811
1812 /* Wake up accept */
1813 nsk->sk_state = IUCV_CONNECTED;
1814 sk->sk_data_ready(sk);
1815 err = 0;
1816 fail:
1817 bh_unlock_sock(sk);
1818 return 0;
1819 }
1820
1821 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1822 {
1823 struct sock *sk = path->private;
1824
1825 sk->sk_state = IUCV_CONNECTED;
1826 sk->sk_state_change(sk);
1827 }
1828
1829 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1830 {
1831 struct sock *sk = path->private;
1832 struct iucv_sock *iucv = iucv_sk(sk);
1833 struct sk_buff *skb;
1834 struct sock_msg_q *save_msg;
1835 int len;
1836
1837 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1838 pr_iucv->message_reject(path, msg);
1839 return;
1840 }
1841
1842 spin_lock(&iucv->message_q.lock);
1843
1844 if (!list_empty(&iucv->message_q.list) ||
1845 !skb_queue_empty(&iucv->backlog_skb_q))
1846 goto save_message;
1847
1848 len = atomic_read(&sk->sk_rmem_alloc);
1849 len += SKB_TRUESIZE(iucv_msg_length(msg));
1850 if (len > sk->sk_rcvbuf)
1851 goto save_message;
1852
1853 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1854 if (!skb)
1855 goto save_message;
1856
1857 iucv_process_message(sk, skb, path, msg);
1858 goto out_unlock;
1859
1860 save_message:
1861 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1862 if (!save_msg)
1863 goto out_unlock;
1864 save_msg->path = path;
1865 save_msg->msg = *msg;
1866
1867 list_add_tail(&save_msg->list, &iucv->message_q.list);
1868
1869 out_unlock:
1870 spin_unlock(&iucv->message_q.lock);
1871 }
1872
1873 static void iucv_callback_txdone(struct iucv_path *path,
1874 struct iucv_message *msg)
1875 {
1876 struct sock *sk = path->private;
1877 struct sk_buff *this = NULL;
1878 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1879 struct sk_buff *list_skb = list->next;
1880 unsigned long flags;
1881
1882 bh_lock_sock(sk);
1883 if (!skb_queue_empty(list)) {
1884 spin_lock_irqsave(&list->lock, flags);
1885
1886 while (list_skb != (struct sk_buff *)list) {
1887 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1888 this = list_skb;
1889 break;
1890 }
1891 list_skb = list_skb->next;
1892 }
1893 if (this)
1894 __skb_unlink(this, list);
1895
1896 spin_unlock_irqrestore(&list->lock, flags);
1897
1898 if (this) {
1899 kfree_skb(this);
1900 /* wake up any process waiting for sending */
1901 iucv_sock_wake_msglim(sk);
1902 }
1903 }
1904
1905 if (sk->sk_state == IUCV_CLOSING) {
1906 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1907 sk->sk_state = IUCV_CLOSED;
1908 sk->sk_state_change(sk);
1909 }
1910 }
1911 bh_unlock_sock(sk);
1912
1913 }
1914
1915 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1916 {
1917 struct sock *sk = path->private;
1918
1919 if (sk->sk_state == IUCV_CLOSED)
1920 return;
1921
1922 bh_lock_sock(sk);
1923 iucv_sever_path(sk, 1);
1924 sk->sk_state = IUCV_DISCONN;
1925
1926 sk->sk_state_change(sk);
1927 bh_unlock_sock(sk);
1928 }
1929
1930 /* called if the other communication side shuts down its RECV direction;
1931 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1932 */
1933 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1934 {
1935 struct sock *sk = path->private;
1936
1937 bh_lock_sock(sk);
1938 if (sk->sk_state != IUCV_CLOSED) {
1939 sk->sk_shutdown |= SEND_SHUTDOWN;
1940 sk->sk_state_change(sk);
1941 }
1942 bh_unlock_sock(sk);
1943 }
1944
1945 /***************** HiperSockets transport callbacks ********************/
1946 static void afiucv_swap_src_dest(struct sk_buff *skb)
1947 {
1948 struct af_iucv_trans_hdr *trans_hdr =
1949 (struct af_iucv_trans_hdr *)skb->data;
1950 char tmpID[8];
1951 char tmpName[8];
1952
1953 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1954 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1955 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1956 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1957 memcpy(tmpID, trans_hdr->srcUserID, 8);
1958 memcpy(tmpName, trans_hdr->srcAppName, 8);
1959 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1960 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1961 memcpy(trans_hdr->destUserID, tmpID, 8);
1962 memcpy(trans_hdr->destAppName, tmpName, 8);
1963 skb_push(skb, ETH_HLEN);
1964 memset(skb->data, 0, ETH_HLEN);
1965 }
1966
1967 /**
1968 * afiucv_hs_callback_syn - react on received SYN
1969 **/
1970 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1971 {
1972 struct sock *nsk;
1973 struct iucv_sock *iucv, *niucv;
1974 struct af_iucv_trans_hdr *trans_hdr;
1975 int err;
1976
1977 iucv = iucv_sk(sk);
1978 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1979 if (!iucv) {
1980 /* no sock - connection refused */
1981 afiucv_swap_src_dest(skb);
1982 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1983 err = dev_queue_xmit(skb);
1984 goto out;
1985 }
1986
1987 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1988 bh_lock_sock(sk);
1989 if ((sk->sk_state != IUCV_LISTEN) ||
1990 sk_acceptq_is_full(sk) ||
1991 !nsk) {
1992 /* error on server socket - connection refused */
1993 afiucv_swap_src_dest(skb);
1994 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1995 err = dev_queue_xmit(skb);
1996 iucv_sock_kill(nsk);
1997 bh_unlock_sock(sk);
1998 goto out;
1999 }
2000
2001 niucv = iucv_sk(nsk);
2002 iucv_sock_init(nsk, sk);
2003 niucv->transport = AF_IUCV_TRANS_HIPER;
2004 niucv->msglimit = iucv->msglimit;
2005 if (!trans_hdr->window)
2006 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
2007 else
2008 niucv->msglimit_peer = trans_hdr->window;
2009 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
2010 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2011 memcpy(niucv->src_name, iucv->src_name, 8);
2012 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2013 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2014 niucv->hs_dev = iucv->hs_dev;
2015 dev_hold(niucv->hs_dev);
2016 afiucv_swap_src_dest(skb);
2017 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2018 trans_hdr->window = niucv->msglimit;
2019 /* if receiver acks the xmit connection is established */
2020 err = dev_queue_xmit(skb);
2021 if (!err) {
2022 iucv_accept_enqueue(sk, nsk);
2023 nsk->sk_state = IUCV_CONNECTED;
2024 sk->sk_data_ready(sk);
2025 } else
2026 iucv_sock_kill(nsk);
2027 bh_unlock_sock(sk);
2028
2029 out:
2030 return NET_RX_SUCCESS;
2031 }
2032
2033 /**
2034 * afiucv_hs_callback_synack() - react on received SYN-ACK
2035 **/
2036 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2037 {
2038 struct iucv_sock *iucv = iucv_sk(sk);
2039 struct af_iucv_trans_hdr *trans_hdr =
2040 (struct af_iucv_trans_hdr *)skb->data;
2041
2042 if (!iucv)
2043 goto out;
2044 if (sk->sk_state != IUCV_BOUND)
2045 goto out;
2046 bh_lock_sock(sk);
2047 iucv->msglimit_peer = trans_hdr->window;
2048 sk->sk_state = IUCV_CONNECTED;
2049 sk->sk_state_change(sk);
2050 bh_unlock_sock(sk);
2051 out:
2052 kfree_skb(skb);
2053 return NET_RX_SUCCESS;
2054 }
2055
2056 /**
2057 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2058 **/
2059 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2060 {
2061 struct iucv_sock *iucv = iucv_sk(sk);
2062
2063 if (!iucv)
2064 goto out;
2065 if (sk->sk_state != IUCV_BOUND)
2066 goto out;
2067 bh_lock_sock(sk);
2068 sk->sk_state = IUCV_DISCONN;
2069 sk->sk_state_change(sk);
2070 bh_unlock_sock(sk);
2071 out:
2072 kfree_skb(skb);
2073 return NET_RX_SUCCESS;
2074 }
2075
2076 /**
2077 * afiucv_hs_callback_fin() - react on received FIN
2078 **/
2079 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2080 {
2081 struct iucv_sock *iucv = iucv_sk(sk);
2082
2083 /* other end of connection closed */
2084 if (!iucv)
2085 goto out;
2086 bh_lock_sock(sk);
2087 if (sk->sk_state == IUCV_CONNECTED) {
2088 sk->sk_state = IUCV_DISCONN;
2089 sk->sk_state_change(sk);
2090 }
2091 bh_unlock_sock(sk);
2092 out:
2093 kfree_skb(skb);
2094 return NET_RX_SUCCESS;
2095 }
2096
2097 /**
2098 * afiucv_hs_callback_win() - react on received WIN
2099 **/
2100 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2101 {
2102 struct iucv_sock *iucv = iucv_sk(sk);
2103 struct af_iucv_trans_hdr *trans_hdr =
2104 (struct af_iucv_trans_hdr *)skb->data;
2105
2106 if (!iucv)
2107 return NET_RX_SUCCESS;
2108
2109 if (sk->sk_state != IUCV_CONNECTED)
2110 return NET_RX_SUCCESS;
2111
2112 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2113 iucv_sock_wake_msglim(sk);
2114 return NET_RX_SUCCESS;
2115 }
2116
2117 /**
2118 * afiucv_hs_callback_rx() - react on received data
2119 **/
2120 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2121 {
2122 struct iucv_sock *iucv = iucv_sk(sk);
2123
2124 if (!iucv) {
2125 kfree_skb(skb);
2126 return NET_RX_SUCCESS;
2127 }
2128
2129 if (sk->sk_state != IUCV_CONNECTED) {
2130 kfree_skb(skb);
2131 return NET_RX_SUCCESS;
2132 }
2133
2134 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2135 kfree_skb(skb);
2136 return NET_RX_SUCCESS;
2137 }
2138
2139 /* write stuff from iucv_msg to skb cb */
2140 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2141 skb_reset_transport_header(skb);
2142 skb_reset_network_header(skb);
2143 IUCV_SKB_CB(skb)->offset = 0;
2144 if (sk_filter(sk, skb)) {
2145 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2146 kfree_skb(skb);
2147 return NET_RX_SUCCESS;
2148 }
2149
2150 spin_lock(&iucv->message_q.lock);
2151 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2152 if (__sock_queue_rcv_skb(sk, skb))
2153 /* handle rcv queue full */
2154 skb_queue_tail(&iucv->backlog_skb_q, skb);
2155 } else
2156 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2157 spin_unlock(&iucv->message_q.lock);
2158 return NET_RX_SUCCESS;
2159 }
2160
2161 /**
2162 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2163 * transport
2164 * called from netif RX softirq
2165 **/
2166 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2167 struct packet_type *pt, struct net_device *orig_dev)
2168 {
2169 struct sock *sk;
2170 struct iucv_sock *iucv;
2171 struct af_iucv_trans_hdr *trans_hdr;
2172 int err = NET_RX_SUCCESS;
2173 char nullstring[8];
2174
2175 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2176 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2177 (int)skb->len,
2178 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2179 kfree_skb(skb);
2180 return NET_RX_SUCCESS;
2181 }
2182 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2183 if (skb_linearize(skb)) {
2184 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2185 (int)skb->len);
2186 kfree_skb(skb);
2187 return NET_RX_SUCCESS;
2188 }
2189 skb_pull(skb, ETH_HLEN);
2190 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2191 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2192 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2193 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2194 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2195 memset(nullstring, 0, sizeof(nullstring));
2196 iucv = NULL;
2197 sk = NULL;
2198 read_lock(&iucv_sk_list.lock);
2199 sk_for_each(sk, &iucv_sk_list.head) {
2200 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2201 if ((!memcmp(&iucv_sk(sk)->src_name,
2202 trans_hdr->destAppName, 8)) &&
2203 (!memcmp(&iucv_sk(sk)->src_user_id,
2204 trans_hdr->destUserID, 8)) &&
2205 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2206 (!memcmp(&iucv_sk(sk)->dst_user_id,
2207 nullstring, 8))) {
2208 iucv = iucv_sk(sk);
2209 break;
2210 }
2211 } else {
2212 if ((!memcmp(&iucv_sk(sk)->src_name,
2213 trans_hdr->destAppName, 8)) &&
2214 (!memcmp(&iucv_sk(sk)->src_user_id,
2215 trans_hdr->destUserID, 8)) &&
2216 (!memcmp(&iucv_sk(sk)->dst_name,
2217 trans_hdr->srcAppName, 8)) &&
2218 (!memcmp(&iucv_sk(sk)->dst_user_id,
2219 trans_hdr->srcUserID, 8))) {
2220 iucv = iucv_sk(sk);
2221 break;
2222 }
2223 }
2224 }
2225 read_unlock(&iucv_sk_list.lock);
2226 if (!iucv)
2227 sk = NULL;
2228
2229 /* no sock
2230 how should we send with no sock
2231 1) send without sock no send rc checking?
2232 2) introduce default sock to handle this cases
2233
2234 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2235 data -> send FIN
2236 SYN|ACK, SYN|FIN, FIN -> no action? */
2237
2238 switch (trans_hdr->flags) {
2239 case AF_IUCV_FLAG_SYN:
2240 /* connect request */
2241 err = afiucv_hs_callback_syn(sk, skb);
2242 break;
2243 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2244 /* connect request confirmed */
2245 err = afiucv_hs_callback_synack(sk, skb);
2246 break;
2247 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2248 /* connect request refused */
2249 err = afiucv_hs_callback_synfin(sk, skb);
2250 break;
2251 case (AF_IUCV_FLAG_FIN):
2252 /* close request */
2253 err = afiucv_hs_callback_fin(sk, skb);
2254 break;
2255 case (AF_IUCV_FLAG_WIN):
2256 err = afiucv_hs_callback_win(sk, skb);
2257 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2258 kfree_skb(skb);
2259 break;
2260 }
2261 /* fall through and receive non-zero length data */
2262 case (AF_IUCV_FLAG_SHT):
2263 /* shutdown request */
2264 /* fall through and receive zero length data */
2265 case 0:
2266 /* plain data frame */
2267 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2268 err = afiucv_hs_callback_rx(sk, skb);
2269 break;
2270 default:
2271 kfree_skb(skb);
2272 }
2273
2274 return err;
2275 }
2276
2277 /**
2278 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2279 * transport
2280 **/
2281 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2282 enum iucv_tx_notify n)
2283 {
2284 struct sock *isk = skb->sk;
2285 struct sock *sk = NULL;
2286 struct iucv_sock *iucv = NULL;
2287 struct sk_buff_head *list;
2288 struct sk_buff *list_skb;
2289 struct sk_buff *nskb;
2290 unsigned long flags;
2291
2292 read_lock_irqsave(&iucv_sk_list.lock, flags);
2293 sk_for_each(sk, &iucv_sk_list.head)
2294 if (sk == isk) {
2295 iucv = iucv_sk(sk);
2296 break;
2297 }
2298 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2299
2300 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2301 return;
2302
2303 list = &iucv->send_skb_q;
2304 spin_lock_irqsave(&list->lock, flags);
2305 if (skb_queue_empty(list))
2306 goto out_unlock;
2307 list_skb = list->next;
2308 nskb = list_skb->next;
2309 while (list_skb != (struct sk_buff *)list) {
2310 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2311 switch (n) {
2312 case TX_NOTIFY_OK:
2313 __skb_unlink(list_skb, list);
2314 kfree_skb(list_skb);
2315 iucv_sock_wake_msglim(sk);
2316 break;
2317 case TX_NOTIFY_PENDING:
2318 atomic_inc(&iucv->pendings);
2319 break;
2320 case TX_NOTIFY_DELAYED_OK:
2321 __skb_unlink(list_skb, list);
2322 atomic_dec(&iucv->pendings);
2323 if (atomic_read(&iucv->pendings) <= 0)
2324 iucv_sock_wake_msglim(sk);
2325 kfree_skb(list_skb);
2326 break;
2327 case TX_NOTIFY_UNREACHABLE:
2328 case TX_NOTIFY_DELAYED_UNREACHABLE:
2329 case TX_NOTIFY_TPQFULL: /* not yet used */
2330 case TX_NOTIFY_GENERALERROR:
2331 case TX_NOTIFY_DELAYED_GENERALERROR:
2332 __skb_unlink(list_skb, list);
2333 kfree_skb(list_skb);
2334 if (sk->sk_state == IUCV_CONNECTED) {
2335 sk->sk_state = IUCV_DISCONN;
2336 sk->sk_state_change(sk);
2337 }
2338 break;
2339 }
2340 break;
2341 }
2342 list_skb = nskb;
2343 nskb = nskb->next;
2344 }
2345 out_unlock:
2346 spin_unlock_irqrestore(&list->lock, flags);
2347
2348 if (sk->sk_state == IUCV_CLOSING) {
2349 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2350 sk->sk_state = IUCV_CLOSED;
2351 sk->sk_state_change(sk);
2352 }
2353 }
2354
2355 }
2356
2357 /*
2358 * afiucv_netdev_event: handle netdev notifier chain events
2359 */
2360 static int afiucv_netdev_event(struct notifier_block *this,
2361 unsigned long event, void *ptr)
2362 {
2363 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2364 struct sock *sk;
2365 struct iucv_sock *iucv;
2366
2367 switch (event) {
2368 case NETDEV_REBOOT:
2369 case NETDEV_GOING_DOWN:
2370 sk_for_each(sk, &iucv_sk_list.head) {
2371 iucv = iucv_sk(sk);
2372 if ((iucv->hs_dev == event_dev) &&
2373 (sk->sk_state == IUCV_CONNECTED)) {
2374 if (event == NETDEV_GOING_DOWN)
2375 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2376 sk->sk_state = IUCV_DISCONN;
2377 sk->sk_state_change(sk);
2378 }
2379 }
2380 break;
2381 case NETDEV_DOWN:
2382 case NETDEV_UNREGISTER:
2383 default:
2384 break;
2385 }
2386 return NOTIFY_DONE;
2387 }
2388
2389 static struct notifier_block afiucv_netdev_notifier = {
2390 .notifier_call = afiucv_netdev_event,
2391 };
2392
2393 static const struct proto_ops iucv_sock_ops = {
2394 .family = PF_IUCV,
2395 .owner = THIS_MODULE,
2396 .release = iucv_sock_release,
2397 .bind = iucv_sock_bind,
2398 .connect = iucv_sock_connect,
2399 .listen = iucv_sock_listen,
2400 .accept = iucv_sock_accept,
2401 .getname = iucv_sock_getname,
2402 .sendmsg = iucv_sock_sendmsg,
2403 .recvmsg = iucv_sock_recvmsg,
2404 .poll = iucv_sock_poll,
2405 .ioctl = sock_no_ioctl,
2406 .mmap = sock_no_mmap,
2407 .socketpair = sock_no_socketpair,
2408 .shutdown = iucv_sock_shutdown,
2409 .setsockopt = iucv_sock_setsockopt,
2410 .getsockopt = iucv_sock_getsockopt,
2411 };
2412
2413 static const struct net_proto_family iucv_sock_family_ops = {
2414 .family = AF_IUCV,
2415 .owner = THIS_MODULE,
2416 .create = iucv_sock_create,
2417 };
2418
2419 static struct packet_type iucv_packet_type = {
2420 .type = cpu_to_be16(ETH_P_AF_IUCV),
2421 .func = afiucv_hs_rcv,
2422 };
2423
2424 static int afiucv_iucv_init(void)
2425 {
2426 int err;
2427
2428 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2429 if (err)
2430 goto out;
2431 /* establish dummy device */
2432 af_iucv_driver.bus = pr_iucv->bus;
2433 err = driver_register(&af_iucv_driver);
2434 if (err)
2435 goto out_iucv;
2436 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2437 if (!af_iucv_dev) {
2438 err = -ENOMEM;
2439 goto out_driver;
2440 }
2441 dev_set_name(af_iucv_dev, "af_iucv");
2442 af_iucv_dev->bus = pr_iucv->bus;
2443 af_iucv_dev->parent = pr_iucv->root;
2444 af_iucv_dev->release = (void (*)(struct device *))kfree;
2445 af_iucv_dev->driver = &af_iucv_driver;
2446 err = device_register(af_iucv_dev);
2447 if (err)
2448 goto out_iucv_dev;
2449 return 0;
2450
2451 out_iucv_dev:
2452 put_device(af_iucv_dev);
2453 out_driver:
2454 driver_unregister(&af_iucv_driver);
2455 out_iucv:
2456 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2457 out:
2458 return err;
2459 }
2460
2461 static void afiucv_iucv_exit(void)
2462 {
2463 device_unregister(af_iucv_dev);
2464 driver_unregister(&af_iucv_driver);
2465 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2466 }
2467
2468 static int __init afiucv_init(void)
2469 {
2470 int err;
2471
2472 if (MACHINE_IS_VM) {
2473 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2474 if (unlikely(err)) {
2475 WARN_ON(err);
2476 err = -EPROTONOSUPPORT;
2477 goto out;
2478 }
2479
2480 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2481 if (!pr_iucv) {
2482 printk(KERN_WARNING "iucv_if lookup failed\n");
2483 memset(&iucv_userid, 0, sizeof(iucv_userid));
2484 }
2485 } else {
2486 memset(&iucv_userid, 0, sizeof(iucv_userid));
2487 pr_iucv = NULL;
2488 }
2489
2490 err = proto_register(&iucv_proto, 0);
2491 if (err)
2492 goto out;
2493 err = sock_register(&iucv_sock_family_ops);
2494 if (err)
2495 goto out_proto;
2496
2497 if (pr_iucv) {
2498 err = afiucv_iucv_init();
2499 if (err)
2500 goto out_sock;
2501 }
2502
2503 err = register_netdevice_notifier(&afiucv_netdev_notifier);
2504 if (err)
2505 goto out_notifier;
2506
2507 dev_add_pack(&iucv_packet_type);
2508 return 0;
2509
2510 out_notifier:
2511 if (pr_iucv)
2512 afiucv_iucv_exit();
2513 out_sock:
2514 sock_unregister(PF_IUCV);
2515 out_proto:
2516 proto_unregister(&iucv_proto);
2517 out:
2518 if (pr_iucv)
2519 symbol_put(iucv_if);
2520 return err;
2521 }
2522
2523 static void __exit afiucv_exit(void)
2524 {
2525 if (pr_iucv) {
2526 afiucv_iucv_exit();
2527 symbol_put(iucv_if);
2528 }
2529
2530 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2531 dev_remove_pack(&iucv_packet_type);
2532 sock_unregister(PF_IUCV);
2533 proto_unregister(&iucv_proto);
2534 }
2535
2536 module_init(afiucv_init);
2537 module_exit(afiucv_exit);
2538
2539 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2540 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2541 MODULE_VERSION(VERSION);
2542 MODULE_LICENSE("GPL");
2543 MODULE_ALIAS_NETPROTO(PF_IUCV);
2544
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