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Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[thirdparty/kernel/stable.git] / net / iucv / af_iucv.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IUCV protocol stack for Linux on zSeries
4 *
5 * Copyright IBM Corp. 2006, 2009
6 *
7 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
8 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
9 * PM functions:
10 * Ursula Braun <ursula.braun@de.ibm.com>
11 */
12
13 #define KMSG_COMPONENT "af_iucv"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/list.h>
19 #include <linux/errno.h>
20 #include <linux/kernel.h>
21 #include <linux/sched/signal.h>
22 #include <linux/slab.h>
23 #include <linux/skbuff.h>
24 #include <linux/init.h>
25 #include <linux/poll.h>
26 #include <linux/security.h>
27 #include <net/sock.h>
28 #include <asm/ebcdic.h>
29 #include <asm/cpcmd.h>
30 #include <linux/kmod.h>
31
32 #include <net/iucv/af_iucv.h>
33
34 #define VERSION "1.2"
35
36 static char iucv_userid[80];
37
38 static const struct proto_ops iucv_sock_ops;
39
40 static struct proto iucv_proto = {
41 .name = "AF_IUCV",
42 .owner = THIS_MODULE,
43 .obj_size = sizeof(struct iucv_sock),
44 };
45
46 static struct iucv_interface *pr_iucv;
47
48 /* special AF_IUCV IPRM messages */
49 static const u8 iprm_shutdown[8] =
50 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
51
52 #define TRGCLS_SIZE FIELD_SIZEOF(struct iucv_message, class)
53
54 #define __iucv_sock_wait(sk, condition, timeo, ret) \
55 do { \
56 DEFINE_WAIT(__wait); \
57 long __timeo = timeo; \
58 ret = 0; \
59 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
60 while (!(condition)) { \
61 if (!__timeo) { \
62 ret = -EAGAIN; \
63 break; \
64 } \
65 if (signal_pending(current)) { \
66 ret = sock_intr_errno(__timeo); \
67 break; \
68 } \
69 release_sock(sk); \
70 __timeo = schedule_timeout(__timeo); \
71 lock_sock(sk); \
72 ret = sock_error(sk); \
73 if (ret) \
74 break; \
75 } \
76 finish_wait(sk_sleep(sk), &__wait); \
77 } while (0)
78
79 #define iucv_sock_wait(sk, condition, timeo) \
80 ({ \
81 int __ret = 0; \
82 if (!(condition)) \
83 __iucv_sock_wait(sk, condition, timeo, __ret); \
84 __ret; \
85 })
86
87 static void iucv_sock_kill(struct sock *sk);
88 static void iucv_sock_close(struct sock *sk);
89 static void iucv_sever_path(struct sock *, int);
90
91 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
92 struct packet_type *pt, struct net_device *orig_dev);
93 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
94 struct sk_buff *skb, u8 flags);
95 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
96
97 /* Call Back functions */
98 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
99 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
100 static void iucv_callback_connack(struct iucv_path *, u8 *);
101 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
102 static void iucv_callback_connrej(struct iucv_path *, u8 *);
103 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
104
105 static struct iucv_sock_list iucv_sk_list = {
106 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
107 .autobind_name = ATOMIC_INIT(0)
108 };
109
110 static struct iucv_handler af_iucv_handler = {
111 .path_pending = iucv_callback_connreq,
112 .path_complete = iucv_callback_connack,
113 .path_severed = iucv_callback_connrej,
114 .message_pending = iucv_callback_rx,
115 .message_complete = iucv_callback_txdone,
116 .path_quiesced = iucv_callback_shutdown,
117 };
118
119 static inline void high_nmcpy(unsigned char *dst, char *src)
120 {
121 memcpy(dst, src, 8);
122 }
123
124 static inline void low_nmcpy(unsigned char *dst, char *src)
125 {
126 memcpy(&dst[8], src, 8);
127 }
128
129 static int afiucv_pm_prepare(struct device *dev)
130 {
131 #ifdef CONFIG_PM_DEBUG
132 printk(KERN_WARNING "afiucv_pm_prepare\n");
133 #endif
134 return 0;
135 }
136
137 static void afiucv_pm_complete(struct device *dev)
138 {
139 #ifdef CONFIG_PM_DEBUG
140 printk(KERN_WARNING "afiucv_pm_complete\n");
141 #endif
142 }
143
144 /**
145 * afiucv_pm_freeze() - Freeze PM callback
146 * @dev: AFIUCV dummy device
147 *
148 * Sever all established IUCV communication pathes
149 */
150 static int afiucv_pm_freeze(struct device *dev)
151 {
152 struct iucv_sock *iucv;
153 struct sock *sk;
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 0;
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 phs_hdr = skb_push(skb, sizeof(*phs_hdr));
325 memset(phs_hdr, 0, sizeof(*phs_hdr));
326 skb_reset_network_header(skb);
327
328 phs_hdr->magic = ETH_P_AF_IUCV;
329 phs_hdr->version = 1;
330 phs_hdr->flags = flags;
331 if (flags == AF_IUCV_FLAG_SYN)
332 phs_hdr->window = iucv->msglimit;
333 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
334 confirm_recv = atomic_read(&iucv->msg_recv);
335 phs_hdr->window = confirm_recv;
336 if (confirm_recv)
337 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
338 }
339 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
340 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
341 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
342 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
343 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
344 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
345 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
346 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
347 if (imsg)
348 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
349
350 skb_push(skb, ETH_HLEN);
351 memset(skb->data, 0, ETH_HLEN);
352
353 skb->dev = iucv->hs_dev;
354 if (!skb->dev) {
355 err = -ENODEV;
356 goto err_free;
357 }
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
359 err = -ENETDOWN;
360 goto err_free;
361 }
362 if (skb->len > skb->dev->mtu) {
363 if (sock->sk_type == SOCK_SEQPACKET) {
364 err = -EMSGSIZE;
365 goto err_free;
366 }
367 skb_trim(skb, skb->dev->mtu);
368 }
369 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
370 nskb = skb_clone(skb, GFP_ATOMIC);
371 if (!nskb) {
372 err = -ENOMEM;
373 goto err_free;
374 }
375
376 skb_queue_tail(&iucv->send_skb_q, nskb);
377 err = dev_queue_xmit(skb);
378 if (net_xmit_eval(err)) {
379 skb_unlink(nskb, &iucv->send_skb_q);
380 kfree_skb(nskb);
381 } else {
382 atomic_sub(confirm_recv, &iucv->msg_recv);
383 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
384 }
385 return net_xmit_eval(err);
386
387 err_free:
388 kfree_skb(skb);
389 return err;
390 }
391
392 static struct sock *__iucv_get_sock_by_name(char *nm)
393 {
394 struct sock *sk;
395
396 sk_for_each(sk, &iucv_sk_list.head)
397 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
398 return sk;
399
400 return NULL;
401 }
402
403 static void iucv_sock_destruct(struct sock *sk)
404 {
405 skb_queue_purge(&sk->sk_receive_queue);
406 skb_queue_purge(&sk->sk_error_queue);
407
408 sk_mem_reclaim(sk);
409
410 if (!sock_flag(sk, SOCK_DEAD)) {
411 pr_err("Attempt to release alive iucv socket %p\n", sk);
412 return;
413 }
414
415 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
416 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
417 WARN_ON(sk->sk_wmem_queued);
418 WARN_ON(sk->sk_forward_alloc);
419 }
420
421 /* Cleanup Listen */
422 static void iucv_sock_cleanup_listen(struct sock *parent)
423 {
424 struct sock *sk;
425
426 /* Close non-accepted connections */
427 while ((sk = iucv_accept_dequeue(parent, NULL))) {
428 iucv_sock_close(sk);
429 iucv_sock_kill(sk);
430 }
431
432 parent->sk_state = IUCV_CLOSED;
433 }
434
435 /* Kill socket (only if zapped and orphaned) */
436 static void iucv_sock_kill(struct sock *sk)
437 {
438 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
439 return;
440
441 iucv_sock_unlink(&iucv_sk_list, sk);
442 sock_set_flag(sk, SOCK_DEAD);
443 sock_put(sk);
444 }
445
446 /* Terminate an IUCV path */
447 static void iucv_sever_path(struct sock *sk, int with_user_data)
448 {
449 unsigned char user_data[16];
450 struct iucv_sock *iucv = iucv_sk(sk);
451 struct iucv_path *path = iucv->path;
452
453 if (iucv->path) {
454 iucv->path = NULL;
455 if (with_user_data) {
456 low_nmcpy(user_data, iucv->src_name);
457 high_nmcpy(user_data, iucv->dst_name);
458 ASCEBC(user_data, sizeof(user_data));
459 pr_iucv->path_sever(path, user_data);
460 } else
461 pr_iucv->path_sever(path, NULL);
462 iucv_path_free(path);
463 }
464 }
465
466 /* Send controlling flags through an IUCV socket for HIPER transport */
467 static int iucv_send_ctrl(struct sock *sk, u8 flags)
468 {
469 int err = 0;
470 int blen;
471 struct sk_buff *skb;
472 u8 shutdown = 0;
473
474 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
475 if (sk->sk_shutdown & SEND_SHUTDOWN) {
476 /* controlling flags should be sent anyway */
477 shutdown = sk->sk_shutdown;
478 sk->sk_shutdown &= RCV_SHUTDOWN;
479 }
480 skb = sock_alloc_send_skb(sk, blen, 1, &err);
481 if (skb) {
482 skb_reserve(skb, blen);
483 err = afiucv_hs_send(NULL, sk, skb, flags);
484 }
485 if (shutdown)
486 sk->sk_shutdown = shutdown;
487 return err;
488 }
489
490 /* Close an IUCV socket */
491 static void iucv_sock_close(struct sock *sk)
492 {
493 struct iucv_sock *iucv = iucv_sk(sk);
494 unsigned long timeo;
495 int err = 0;
496
497 lock_sock(sk);
498
499 switch (sk->sk_state) {
500 case IUCV_LISTEN:
501 iucv_sock_cleanup_listen(sk);
502 break;
503
504 case IUCV_CONNECTED:
505 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
506 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
507 sk->sk_state = IUCV_DISCONN;
508 sk->sk_state_change(sk);
509 }
510 case IUCV_DISCONN: /* fall through */
511 sk->sk_state = IUCV_CLOSING;
512 sk->sk_state_change(sk);
513
514 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
515 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
516 timeo = sk->sk_lingertime;
517 else
518 timeo = IUCV_DISCONN_TIMEOUT;
519 iucv_sock_wait(sk,
520 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
521 timeo);
522 }
523
524 case IUCV_CLOSING: /* fall through */
525 sk->sk_state = IUCV_CLOSED;
526 sk->sk_state_change(sk);
527
528 sk->sk_err = ECONNRESET;
529 sk->sk_state_change(sk);
530
531 skb_queue_purge(&iucv->send_skb_q);
532 skb_queue_purge(&iucv->backlog_skb_q);
533
534 default: /* fall through */
535 iucv_sever_path(sk, 1);
536 }
537
538 if (iucv->hs_dev) {
539 dev_put(iucv->hs_dev);
540 iucv->hs_dev = NULL;
541 sk->sk_bound_dev_if = 0;
542 }
543
544 /* mark socket for deletion by iucv_sock_kill() */
545 sock_set_flag(sk, SOCK_ZAPPED);
546
547 release_sock(sk);
548 }
549
550 static void iucv_sock_init(struct sock *sk, struct sock *parent)
551 {
552 if (parent) {
553 sk->sk_type = parent->sk_type;
554 security_sk_clone(parent, sk);
555 }
556 }
557
558 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
559 {
560 struct sock *sk;
561 struct iucv_sock *iucv;
562
563 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
564 if (!sk)
565 return NULL;
566 iucv = iucv_sk(sk);
567
568 sock_init_data(sock, sk);
569 INIT_LIST_HEAD(&iucv->accept_q);
570 spin_lock_init(&iucv->accept_q_lock);
571 skb_queue_head_init(&iucv->send_skb_q);
572 INIT_LIST_HEAD(&iucv->message_q.list);
573 spin_lock_init(&iucv->message_q.lock);
574 skb_queue_head_init(&iucv->backlog_skb_q);
575 iucv->send_tag = 0;
576 atomic_set(&iucv->pendings, 0);
577 iucv->flags = 0;
578 iucv->msglimit = 0;
579 atomic_set(&iucv->msg_sent, 0);
580 atomic_set(&iucv->msg_recv, 0);
581 iucv->path = NULL;
582 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
583 memset(&iucv->src_user_id , 0, 32);
584 if (pr_iucv)
585 iucv->transport = AF_IUCV_TRANS_IUCV;
586 else
587 iucv->transport = AF_IUCV_TRANS_HIPER;
588
589 sk->sk_destruct = iucv_sock_destruct;
590 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
591 sk->sk_allocation = GFP_DMA;
592
593 sock_reset_flag(sk, SOCK_ZAPPED);
594
595 sk->sk_protocol = proto;
596 sk->sk_state = IUCV_OPEN;
597
598 iucv_sock_link(&iucv_sk_list, sk);
599 return sk;
600 }
601
602 /* Create an IUCV socket */
603 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
604 int kern)
605 {
606 struct sock *sk;
607
608 if (protocol && protocol != PF_IUCV)
609 return -EPROTONOSUPPORT;
610
611 sock->state = SS_UNCONNECTED;
612
613 switch (sock->type) {
614 case SOCK_STREAM:
615 sock->ops = &iucv_sock_ops;
616 break;
617 case SOCK_SEQPACKET:
618 /* currently, proto ops can handle both sk types */
619 sock->ops = &iucv_sock_ops;
620 break;
621 default:
622 return -ESOCKTNOSUPPORT;
623 }
624
625 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
626 if (!sk)
627 return -ENOMEM;
628
629 iucv_sock_init(sk, NULL);
630
631 return 0;
632 }
633
634 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
635 {
636 write_lock_bh(&l->lock);
637 sk_add_node(sk, &l->head);
638 write_unlock_bh(&l->lock);
639 }
640
641 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
642 {
643 write_lock_bh(&l->lock);
644 sk_del_node_init(sk);
645 write_unlock_bh(&l->lock);
646 }
647
648 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
649 {
650 unsigned long flags;
651 struct iucv_sock *par = iucv_sk(parent);
652
653 sock_hold(sk);
654 spin_lock_irqsave(&par->accept_q_lock, flags);
655 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
656 spin_unlock_irqrestore(&par->accept_q_lock, flags);
657 iucv_sk(sk)->parent = parent;
658 sk_acceptq_added(parent);
659 }
660
661 void iucv_accept_unlink(struct sock *sk)
662 {
663 unsigned long flags;
664 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
665
666 spin_lock_irqsave(&par->accept_q_lock, flags);
667 list_del_init(&iucv_sk(sk)->accept_q);
668 spin_unlock_irqrestore(&par->accept_q_lock, flags);
669 sk_acceptq_removed(iucv_sk(sk)->parent);
670 iucv_sk(sk)->parent = NULL;
671 sock_put(sk);
672 }
673
674 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
675 {
676 struct iucv_sock *isk, *n;
677 struct sock *sk;
678
679 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
680 sk = (struct sock *) isk;
681 lock_sock(sk);
682
683 if (sk->sk_state == IUCV_CLOSED) {
684 iucv_accept_unlink(sk);
685 release_sock(sk);
686 continue;
687 }
688
689 if (sk->sk_state == IUCV_CONNECTED ||
690 sk->sk_state == IUCV_DISCONN ||
691 !newsock) {
692 iucv_accept_unlink(sk);
693 if (newsock)
694 sock_graft(sk, newsock);
695
696 release_sock(sk);
697 return sk;
698 }
699
700 release_sock(sk);
701 }
702 return NULL;
703 }
704
705 static void __iucv_auto_name(struct iucv_sock *iucv)
706 {
707 char name[12];
708
709 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
710 while (__iucv_get_sock_by_name(name)) {
711 sprintf(name, "%08x",
712 atomic_inc_return(&iucv_sk_list.autobind_name));
713 }
714 memcpy(iucv->src_name, name, 8);
715 }
716
717 /* Bind an unbound socket */
718 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
719 int addr_len)
720 {
721 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
722 struct sock *sk = sock->sk;
723 struct iucv_sock *iucv;
724 int err = 0;
725 struct net_device *dev;
726 char uid[9];
727
728 /* Verify the input sockaddr */
729 if (addr_len < sizeof(struct sockaddr_iucv) ||
730 addr->sa_family != AF_IUCV)
731 return -EINVAL;
732
733 lock_sock(sk);
734 if (sk->sk_state != IUCV_OPEN) {
735 err = -EBADFD;
736 goto done;
737 }
738
739 write_lock_bh(&iucv_sk_list.lock);
740
741 iucv = iucv_sk(sk);
742 if (__iucv_get_sock_by_name(sa->siucv_name)) {
743 err = -EADDRINUSE;
744 goto done_unlock;
745 }
746 if (iucv->path)
747 goto done_unlock;
748
749 /* Bind the socket */
750 if (pr_iucv)
751 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
752 goto vm_bind; /* VM IUCV transport */
753
754 /* try hiper transport */
755 memcpy(uid, sa->siucv_user_id, sizeof(uid));
756 ASCEBC(uid, 8);
757 rcu_read_lock();
758 for_each_netdev_rcu(&init_net, dev) {
759 if (!memcmp(dev->perm_addr, uid, 8)) {
760 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
761 /* Check for unitialized siucv_name */
762 if (strncmp(sa->siucv_name, " ", 8) == 0)
763 __iucv_auto_name(iucv);
764 else
765 memcpy(iucv->src_name, sa->siucv_name, 8);
766 sk->sk_bound_dev_if = dev->ifindex;
767 iucv->hs_dev = dev;
768 dev_hold(dev);
769 sk->sk_state = IUCV_BOUND;
770 iucv->transport = AF_IUCV_TRANS_HIPER;
771 if (!iucv->msglimit)
772 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
773 rcu_read_unlock();
774 goto done_unlock;
775 }
776 }
777 rcu_read_unlock();
778 vm_bind:
779 if (pr_iucv) {
780 /* use local userid for backward compat */
781 memcpy(iucv->src_name, sa->siucv_name, 8);
782 memcpy(iucv->src_user_id, iucv_userid, 8);
783 sk->sk_state = IUCV_BOUND;
784 iucv->transport = AF_IUCV_TRANS_IUCV;
785 if (!iucv->msglimit)
786 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
787 goto done_unlock;
788 }
789 /* found no dev to bind */
790 err = -ENODEV;
791 done_unlock:
792 /* Release the socket list lock */
793 write_unlock_bh(&iucv_sk_list.lock);
794 done:
795 release_sock(sk);
796 return err;
797 }
798
799 /* Automatically bind an unbound socket */
800 static int iucv_sock_autobind(struct sock *sk)
801 {
802 struct iucv_sock *iucv = iucv_sk(sk);
803 int err = 0;
804
805 if (unlikely(!pr_iucv))
806 return -EPROTO;
807
808 memcpy(iucv->src_user_id, iucv_userid, 8);
809
810 write_lock_bh(&iucv_sk_list.lock);
811 __iucv_auto_name(iucv);
812 write_unlock_bh(&iucv_sk_list.lock);
813
814 if (!iucv->msglimit)
815 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
816
817 return err;
818 }
819
820 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
821 {
822 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
823 struct sock *sk = sock->sk;
824 struct iucv_sock *iucv = iucv_sk(sk);
825 unsigned char user_data[16];
826 int err;
827
828 high_nmcpy(user_data, sa->siucv_name);
829 low_nmcpy(user_data, iucv->src_name);
830 ASCEBC(user_data, sizeof(user_data));
831
832 /* Create path. */
833 iucv->path = iucv_path_alloc(iucv->msglimit,
834 IUCV_IPRMDATA, GFP_KERNEL);
835 if (!iucv->path) {
836 err = -ENOMEM;
837 goto done;
838 }
839 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
840 sa->siucv_user_id, NULL, user_data,
841 sk);
842 if (err) {
843 iucv_path_free(iucv->path);
844 iucv->path = NULL;
845 switch (err) {
846 case 0x0b: /* Target communicator is not logged on */
847 err = -ENETUNREACH;
848 break;
849 case 0x0d: /* Max connections for this guest exceeded */
850 case 0x0e: /* Max connections for target guest exceeded */
851 err = -EAGAIN;
852 break;
853 case 0x0f: /* Missing IUCV authorization */
854 err = -EACCES;
855 break;
856 default:
857 err = -ECONNREFUSED;
858 break;
859 }
860 }
861 done:
862 return err;
863 }
864
865 /* Connect an unconnected socket */
866 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
867 int alen, int flags)
868 {
869 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
870 struct sock *sk = sock->sk;
871 struct iucv_sock *iucv = iucv_sk(sk);
872 int err;
873
874 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
875 return -EINVAL;
876
877 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
878 return -EBADFD;
879
880 if (sk->sk_state == IUCV_OPEN &&
881 iucv->transport == AF_IUCV_TRANS_HIPER)
882 return -EBADFD; /* explicit bind required */
883
884 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
885 return -EINVAL;
886
887 if (sk->sk_state == IUCV_OPEN) {
888 err = iucv_sock_autobind(sk);
889 if (unlikely(err))
890 return err;
891 }
892
893 lock_sock(sk);
894
895 /* Set the destination information */
896 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
897 memcpy(iucv->dst_name, sa->siucv_name, 8);
898
899 if (iucv->transport == AF_IUCV_TRANS_HIPER)
900 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
901 else
902 err = afiucv_path_connect(sock, addr);
903 if (err)
904 goto done;
905
906 if (sk->sk_state != IUCV_CONNECTED)
907 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
908 IUCV_DISCONN),
909 sock_sndtimeo(sk, flags & O_NONBLOCK));
910
911 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
912 err = -ECONNREFUSED;
913
914 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
915 iucv_sever_path(sk, 0);
916
917 done:
918 release_sock(sk);
919 return err;
920 }
921
922 /* Move a socket into listening state. */
923 static int iucv_sock_listen(struct socket *sock, int backlog)
924 {
925 struct sock *sk = sock->sk;
926 int err;
927
928 lock_sock(sk);
929
930 err = -EINVAL;
931 if (sk->sk_state != IUCV_BOUND)
932 goto done;
933
934 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
935 goto done;
936
937 sk->sk_max_ack_backlog = backlog;
938 sk->sk_ack_backlog = 0;
939 sk->sk_state = IUCV_LISTEN;
940 err = 0;
941
942 done:
943 release_sock(sk);
944 return err;
945 }
946
947 /* Accept a pending connection */
948 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
949 int flags, bool kern)
950 {
951 DECLARE_WAITQUEUE(wait, current);
952 struct sock *sk = sock->sk, *nsk;
953 long timeo;
954 int err = 0;
955
956 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
957
958 if (sk->sk_state != IUCV_LISTEN) {
959 err = -EBADFD;
960 goto done;
961 }
962
963 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
964
965 /* Wait for an incoming connection */
966 add_wait_queue_exclusive(sk_sleep(sk), &wait);
967 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
968 set_current_state(TASK_INTERRUPTIBLE);
969 if (!timeo) {
970 err = -EAGAIN;
971 break;
972 }
973
974 release_sock(sk);
975 timeo = schedule_timeout(timeo);
976 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
977
978 if (sk->sk_state != IUCV_LISTEN) {
979 err = -EBADFD;
980 break;
981 }
982
983 if (signal_pending(current)) {
984 err = sock_intr_errno(timeo);
985 break;
986 }
987 }
988
989 set_current_state(TASK_RUNNING);
990 remove_wait_queue(sk_sleep(sk), &wait);
991
992 if (err)
993 goto done;
994
995 newsock->state = SS_CONNECTED;
996
997 done:
998 release_sock(sk);
999 return err;
1000 }
1001
1002 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
1003 int peer)
1004 {
1005 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
1006 struct sock *sk = sock->sk;
1007 struct iucv_sock *iucv = iucv_sk(sk);
1008
1009 addr->sa_family = AF_IUCV;
1010
1011 if (peer) {
1012 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1013 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1014 } else {
1015 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1016 memcpy(siucv->siucv_name, iucv->src_name, 8);
1017 }
1018 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1019 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1020 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1021
1022 return sizeof(struct sockaddr_iucv);
1023 }
1024
1025 /**
1026 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1027 * @path: IUCV path
1028 * @msg: Pointer to a struct iucv_message
1029 * @skb: The socket data to send, skb->len MUST BE <= 7
1030 *
1031 * Send the socket data in the parameter list in the iucv message
1032 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1033 * list and the socket data len at index 7 (last byte).
1034 * See also iucv_msg_length().
1035 *
1036 * Returns the error code from the iucv_message_send() call.
1037 */
1038 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1039 struct sk_buff *skb)
1040 {
1041 u8 prmdata[8];
1042
1043 memcpy(prmdata, (void *) skb->data, skb->len);
1044 prmdata[7] = 0xff - (u8) skb->len;
1045 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1046 (void *) prmdata, 8);
1047 }
1048
1049 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1050 size_t len)
1051 {
1052 struct sock *sk = sock->sk;
1053 struct iucv_sock *iucv = iucv_sk(sk);
1054 size_t headroom = 0;
1055 size_t linear;
1056 struct sk_buff *skb;
1057 struct iucv_message txmsg = {0};
1058 struct cmsghdr *cmsg;
1059 int cmsg_done;
1060 long timeo;
1061 char user_id[9];
1062 char appl_id[9];
1063 int err;
1064 int noblock = msg->msg_flags & MSG_DONTWAIT;
1065
1066 err = sock_error(sk);
1067 if (err)
1068 return err;
1069
1070 if (msg->msg_flags & MSG_OOB)
1071 return -EOPNOTSUPP;
1072
1073 /* SOCK_SEQPACKET: we do not support segmented records */
1074 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1075 return -EOPNOTSUPP;
1076
1077 lock_sock(sk);
1078
1079 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1080 err = -EPIPE;
1081 goto out;
1082 }
1083
1084 /* Return if the socket is not in connected state */
1085 if (sk->sk_state != IUCV_CONNECTED) {
1086 err = -ENOTCONN;
1087 goto out;
1088 }
1089
1090 /* initialize defaults */
1091 cmsg_done = 0; /* check for duplicate headers */
1092 txmsg.class = 0;
1093
1094 /* iterate over control messages */
1095 for_each_cmsghdr(cmsg, msg) {
1096 if (!CMSG_OK(msg, cmsg)) {
1097 err = -EINVAL;
1098 goto out;
1099 }
1100
1101 if (cmsg->cmsg_level != SOL_IUCV)
1102 continue;
1103
1104 if (cmsg->cmsg_type & cmsg_done) {
1105 err = -EINVAL;
1106 goto out;
1107 }
1108 cmsg_done |= cmsg->cmsg_type;
1109
1110 switch (cmsg->cmsg_type) {
1111 case SCM_IUCV_TRGCLS:
1112 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1113 err = -EINVAL;
1114 goto out;
1115 }
1116
1117 /* set iucv message target class */
1118 memcpy(&txmsg.class,
1119 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1120
1121 break;
1122
1123 default:
1124 err = -EINVAL;
1125 goto out;
1126 }
1127 }
1128
1129 /* allocate one skb for each iucv message:
1130 * this is fine for SOCK_SEQPACKET (unless we want to support
1131 * segmented records using the MSG_EOR flag), but
1132 * for SOCK_STREAM we might want to improve it in future */
1133 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1134 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1135 linear = len;
1136 } else {
1137 if (len < PAGE_SIZE) {
1138 linear = len;
1139 } else {
1140 /* In nonlinear "classic" iucv skb,
1141 * reserve space for iucv_array
1142 */
1143 headroom = sizeof(struct iucv_array) *
1144 (MAX_SKB_FRAGS + 1);
1145 linear = PAGE_SIZE - headroom;
1146 }
1147 }
1148 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1149 noblock, &err, 0);
1150 if (!skb)
1151 goto out;
1152 if (headroom)
1153 skb_reserve(skb, headroom);
1154 skb_put(skb, linear);
1155 skb->len = len;
1156 skb->data_len = len - linear;
1157 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1158 if (err)
1159 goto fail;
1160
1161 /* wait if outstanding messages for iucv path has reached */
1162 timeo = sock_sndtimeo(sk, noblock);
1163 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1164 if (err)
1165 goto fail;
1166
1167 /* return -ECONNRESET if the socket is no longer connected */
1168 if (sk->sk_state != IUCV_CONNECTED) {
1169 err = -ECONNRESET;
1170 goto fail;
1171 }
1172
1173 /* increment and save iucv message tag for msg_completion cbk */
1174 txmsg.tag = iucv->send_tag++;
1175 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1176
1177 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1178 atomic_inc(&iucv->msg_sent);
1179 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1180 if (err) {
1181 atomic_dec(&iucv->msg_sent);
1182 goto out;
1183 }
1184 } else { /* Classic VM IUCV transport */
1185 skb_queue_tail(&iucv->send_skb_q, skb);
1186
1187 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1188 skb->len <= 7) {
1189 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1190
1191 /* on success: there is no message_complete callback */
1192 /* for an IPRMDATA msg; remove skb from send queue */
1193 if (err == 0) {
1194 skb_unlink(skb, &iucv->send_skb_q);
1195 kfree_skb(skb);
1196 }
1197
1198 /* this error should never happen since the */
1199 /* IUCV_IPRMDATA path flag is set... sever path */
1200 if (err == 0x15) {
1201 pr_iucv->path_sever(iucv->path, NULL);
1202 skb_unlink(skb, &iucv->send_skb_q);
1203 err = -EPIPE;
1204 goto fail;
1205 }
1206 } else if (skb_is_nonlinear(skb)) {
1207 struct iucv_array *iba = (struct iucv_array *)skb->head;
1208 int i;
1209
1210 /* skip iucv_array lying in the headroom */
1211 iba[0].address = (u32)(addr_t)skb->data;
1212 iba[0].length = (u32)skb_headlen(skb);
1213 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1214 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1215
1216 iba[i + 1].address =
1217 (u32)(addr_t)skb_frag_address(frag);
1218 iba[i + 1].length = (u32)skb_frag_size(frag);
1219 }
1220 err = pr_iucv->message_send(iucv->path, &txmsg,
1221 IUCV_IPBUFLST, 0,
1222 (void *)iba, skb->len);
1223 } else { /* non-IPRM Linear skb */
1224 err = pr_iucv->message_send(iucv->path, &txmsg,
1225 0, 0, (void *)skb->data, skb->len);
1226 }
1227 if (err) {
1228 if (err == 3) {
1229 user_id[8] = 0;
1230 memcpy(user_id, iucv->dst_user_id, 8);
1231 appl_id[8] = 0;
1232 memcpy(appl_id, iucv->dst_name, 8);
1233 pr_err(
1234 "Application %s on z/VM guest %s exceeds message limit\n",
1235 appl_id, user_id);
1236 err = -EAGAIN;
1237 } else {
1238 err = -EPIPE;
1239 }
1240 skb_unlink(skb, &iucv->send_skb_q);
1241 goto fail;
1242 }
1243 }
1244
1245 release_sock(sk);
1246 return len;
1247
1248 fail:
1249 kfree_skb(skb);
1250 out:
1251 release_sock(sk);
1252 return err;
1253 }
1254
1255 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1256 {
1257 size_t headroom, linear;
1258 struct sk_buff *skb;
1259 int err;
1260
1261 if (len < PAGE_SIZE) {
1262 headroom = 0;
1263 linear = len;
1264 } else {
1265 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1266 linear = PAGE_SIZE - headroom;
1267 }
1268 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1269 0, &err, GFP_ATOMIC | GFP_DMA);
1270 WARN_ONCE(!skb,
1271 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1272 len, err);
1273 if (skb) {
1274 if (headroom)
1275 skb_reserve(skb, headroom);
1276 skb_put(skb, linear);
1277 skb->len = len;
1278 skb->data_len = len - linear;
1279 }
1280 return skb;
1281 }
1282
1283 /* iucv_process_message() - Receive a single outstanding IUCV message
1284 *
1285 * Locking: must be called with message_q.lock held
1286 */
1287 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1288 struct iucv_path *path,
1289 struct iucv_message *msg)
1290 {
1291 int rc;
1292 unsigned int len;
1293
1294 len = iucv_msg_length(msg);
1295
1296 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1297 /* Note: the first 4 bytes are reserved for msg tag */
1298 IUCV_SKB_CB(skb)->class = msg->class;
1299
1300 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1301 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1302 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1303 skb->data = NULL;
1304 skb->len = 0;
1305 }
1306 } else {
1307 if (skb_is_nonlinear(skb)) {
1308 struct iucv_array *iba = (struct iucv_array *)skb->head;
1309 int i;
1310
1311 iba[0].address = (u32)(addr_t)skb->data;
1312 iba[0].length = (u32)skb_headlen(skb);
1313 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1314 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1315
1316 iba[i + 1].address =
1317 (u32)(addr_t)skb_frag_address(frag);
1318 iba[i + 1].length = (u32)skb_frag_size(frag);
1319 }
1320 rc = pr_iucv->message_receive(path, msg,
1321 IUCV_IPBUFLST,
1322 (void *)iba, len, NULL);
1323 } else {
1324 rc = pr_iucv->message_receive(path, msg,
1325 msg->flags & IUCV_IPRMDATA,
1326 skb->data, len, NULL);
1327 }
1328 if (rc) {
1329 kfree_skb(skb);
1330 return;
1331 }
1332 WARN_ON_ONCE(skb->len != len);
1333 }
1334
1335 IUCV_SKB_CB(skb)->offset = 0;
1336 if (sk_filter(sk, skb)) {
1337 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1338 kfree_skb(skb);
1339 return;
1340 }
1341 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1342 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1343 }
1344
1345 /* iucv_process_message_q() - Process outstanding IUCV messages
1346 *
1347 * Locking: must be called with message_q.lock held
1348 */
1349 static void iucv_process_message_q(struct sock *sk)
1350 {
1351 struct iucv_sock *iucv = iucv_sk(sk);
1352 struct sk_buff *skb;
1353 struct sock_msg_q *p, *n;
1354
1355 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1356 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1357 if (!skb)
1358 break;
1359 iucv_process_message(sk, skb, p->path, &p->msg);
1360 list_del(&p->list);
1361 kfree(p);
1362 if (!skb_queue_empty(&iucv->backlog_skb_q))
1363 break;
1364 }
1365 }
1366
1367 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1368 size_t len, int flags)
1369 {
1370 int noblock = flags & MSG_DONTWAIT;
1371 struct sock *sk = sock->sk;
1372 struct iucv_sock *iucv = iucv_sk(sk);
1373 unsigned int copied, rlen;
1374 struct sk_buff *skb, *rskb, *cskb;
1375 int err = 0;
1376 u32 offset;
1377
1378 if ((sk->sk_state == IUCV_DISCONN) &&
1379 skb_queue_empty(&iucv->backlog_skb_q) &&
1380 skb_queue_empty(&sk->sk_receive_queue) &&
1381 list_empty(&iucv->message_q.list))
1382 return 0;
1383
1384 if (flags & (MSG_OOB))
1385 return -EOPNOTSUPP;
1386
1387 /* receive/dequeue next skb:
1388 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1389 skb = skb_recv_datagram(sk, flags, noblock, &err);
1390 if (!skb) {
1391 if (sk->sk_shutdown & RCV_SHUTDOWN)
1392 return 0;
1393 return err;
1394 }
1395
1396 offset = IUCV_SKB_CB(skb)->offset;
1397 rlen = skb->len - offset; /* real length of skb */
1398 copied = min_t(unsigned int, rlen, len);
1399 if (!rlen)
1400 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1401
1402 cskb = skb;
1403 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1404 if (!(flags & MSG_PEEK))
1405 skb_queue_head(&sk->sk_receive_queue, skb);
1406 return -EFAULT;
1407 }
1408
1409 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1410 if (sk->sk_type == SOCK_SEQPACKET) {
1411 if (copied < rlen)
1412 msg->msg_flags |= MSG_TRUNC;
1413 /* each iucv message contains a complete record */
1414 msg->msg_flags |= MSG_EOR;
1415 }
1416
1417 /* create control message to store iucv msg target class:
1418 * get the trgcls from the control buffer of the skb due to
1419 * fragmentation of original iucv message. */
1420 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1421 sizeof(IUCV_SKB_CB(skb)->class),
1422 (void *)&IUCV_SKB_CB(skb)->class);
1423 if (err) {
1424 if (!(flags & MSG_PEEK))
1425 skb_queue_head(&sk->sk_receive_queue, skb);
1426 return err;
1427 }
1428
1429 /* Mark read part of skb as used */
1430 if (!(flags & MSG_PEEK)) {
1431
1432 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1433 if (sk->sk_type == SOCK_STREAM) {
1434 if (copied < rlen) {
1435 IUCV_SKB_CB(skb)->offset = offset + copied;
1436 skb_queue_head(&sk->sk_receive_queue, skb);
1437 goto done;
1438 }
1439 }
1440
1441 kfree_skb(skb);
1442 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1443 atomic_inc(&iucv->msg_recv);
1444 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1445 WARN_ON(1);
1446 iucv_sock_close(sk);
1447 return -EFAULT;
1448 }
1449 }
1450
1451 /* Queue backlog skbs */
1452 spin_lock_bh(&iucv->message_q.lock);
1453 rskb = skb_dequeue(&iucv->backlog_skb_q);
1454 while (rskb) {
1455 IUCV_SKB_CB(rskb)->offset = 0;
1456 if (__sock_queue_rcv_skb(sk, rskb)) {
1457 /* handle rcv queue full */
1458 skb_queue_head(&iucv->backlog_skb_q,
1459 rskb);
1460 break;
1461 }
1462 rskb = skb_dequeue(&iucv->backlog_skb_q);
1463 }
1464 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1465 if (!list_empty(&iucv->message_q.list))
1466 iucv_process_message_q(sk);
1467 if (atomic_read(&iucv->msg_recv) >=
1468 iucv->msglimit / 2) {
1469 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1470 if (err) {
1471 sk->sk_state = IUCV_DISCONN;
1472 sk->sk_state_change(sk);
1473 }
1474 }
1475 }
1476 spin_unlock_bh(&iucv->message_q.lock);
1477 }
1478
1479 done:
1480 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1481 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1482 copied = rlen;
1483
1484 return copied;
1485 }
1486
1487 static inline __poll_t iucv_accept_poll(struct sock *parent)
1488 {
1489 struct iucv_sock *isk, *n;
1490 struct sock *sk;
1491
1492 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1493 sk = (struct sock *) isk;
1494
1495 if (sk->sk_state == IUCV_CONNECTED)
1496 return EPOLLIN | EPOLLRDNORM;
1497 }
1498
1499 return 0;
1500 }
1501
1502 __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1503 poll_table *wait)
1504 {
1505 struct sock *sk = sock->sk;
1506 __poll_t mask = 0;
1507
1508 sock_poll_wait(file, sock, wait);
1509
1510 if (sk->sk_state == IUCV_LISTEN)
1511 return iucv_accept_poll(sk);
1512
1513 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1514 mask |= EPOLLERR |
1515 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1516
1517 if (sk->sk_shutdown & RCV_SHUTDOWN)
1518 mask |= EPOLLRDHUP;
1519
1520 if (sk->sk_shutdown == SHUTDOWN_MASK)
1521 mask |= EPOLLHUP;
1522
1523 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1524 (sk->sk_shutdown & RCV_SHUTDOWN))
1525 mask |= EPOLLIN | EPOLLRDNORM;
1526
1527 if (sk->sk_state == IUCV_CLOSED)
1528 mask |= EPOLLHUP;
1529
1530 if (sk->sk_state == IUCV_DISCONN)
1531 mask |= EPOLLIN;
1532
1533 if (sock_writeable(sk) && iucv_below_msglim(sk))
1534 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1535 else
1536 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1537
1538 return mask;
1539 }
1540
1541 static int iucv_sock_shutdown(struct socket *sock, int how)
1542 {
1543 struct sock *sk = sock->sk;
1544 struct iucv_sock *iucv = iucv_sk(sk);
1545 struct iucv_message txmsg;
1546 int err = 0;
1547
1548 how++;
1549
1550 if ((how & ~SHUTDOWN_MASK) || !how)
1551 return -EINVAL;
1552
1553 lock_sock(sk);
1554 switch (sk->sk_state) {
1555 case IUCV_LISTEN:
1556 case IUCV_DISCONN:
1557 case IUCV_CLOSING:
1558 case IUCV_CLOSED:
1559 err = -ENOTCONN;
1560 goto fail;
1561 default:
1562 break;
1563 }
1564
1565 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1566 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1567 txmsg.class = 0;
1568 txmsg.tag = 0;
1569 err = pr_iucv->message_send(iucv->path, &txmsg,
1570 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1571 if (err) {
1572 switch (err) {
1573 case 1:
1574 err = -ENOTCONN;
1575 break;
1576 case 2:
1577 err = -ECONNRESET;
1578 break;
1579 default:
1580 err = -ENOTCONN;
1581 break;
1582 }
1583 }
1584 } else
1585 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1586 }
1587
1588 sk->sk_shutdown |= how;
1589 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1590 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1591 iucv->path) {
1592 err = pr_iucv->path_quiesce(iucv->path, NULL);
1593 if (err)
1594 err = -ENOTCONN;
1595 /* skb_queue_purge(&sk->sk_receive_queue); */
1596 }
1597 skb_queue_purge(&sk->sk_receive_queue);
1598 }
1599
1600 /* Wake up anyone sleeping in poll */
1601 sk->sk_state_change(sk);
1602
1603 fail:
1604 release_sock(sk);
1605 return err;
1606 }
1607
1608 static int iucv_sock_release(struct socket *sock)
1609 {
1610 struct sock *sk = sock->sk;
1611 int err = 0;
1612
1613 if (!sk)
1614 return 0;
1615
1616 iucv_sock_close(sk);
1617
1618 sock_orphan(sk);
1619 iucv_sock_kill(sk);
1620 return err;
1621 }
1622
1623 /* getsockopt and setsockopt */
1624 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1625 char __user *optval, unsigned int optlen)
1626 {
1627 struct sock *sk = sock->sk;
1628 struct iucv_sock *iucv = iucv_sk(sk);
1629 int val;
1630 int rc;
1631
1632 if (level != SOL_IUCV)
1633 return -ENOPROTOOPT;
1634
1635 if (optlen < sizeof(int))
1636 return -EINVAL;
1637
1638 if (get_user(val, (int __user *) optval))
1639 return -EFAULT;
1640
1641 rc = 0;
1642
1643 lock_sock(sk);
1644 switch (optname) {
1645 case SO_IPRMDATA_MSG:
1646 if (val)
1647 iucv->flags |= IUCV_IPRMDATA;
1648 else
1649 iucv->flags &= ~IUCV_IPRMDATA;
1650 break;
1651 case SO_MSGLIMIT:
1652 switch (sk->sk_state) {
1653 case IUCV_OPEN:
1654 case IUCV_BOUND:
1655 if (val < 1 || val > (u16)(~0))
1656 rc = -EINVAL;
1657 else
1658 iucv->msglimit = val;
1659 break;
1660 default:
1661 rc = -EINVAL;
1662 break;
1663 }
1664 break;
1665 default:
1666 rc = -ENOPROTOOPT;
1667 break;
1668 }
1669 release_sock(sk);
1670
1671 return rc;
1672 }
1673
1674 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1675 char __user *optval, int __user *optlen)
1676 {
1677 struct sock *sk = sock->sk;
1678 struct iucv_sock *iucv = iucv_sk(sk);
1679 unsigned int val;
1680 int len;
1681
1682 if (level != SOL_IUCV)
1683 return -ENOPROTOOPT;
1684
1685 if (get_user(len, optlen))
1686 return -EFAULT;
1687
1688 if (len < 0)
1689 return -EINVAL;
1690
1691 len = min_t(unsigned int, len, sizeof(int));
1692
1693 switch (optname) {
1694 case SO_IPRMDATA_MSG:
1695 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1696 break;
1697 case SO_MSGLIMIT:
1698 lock_sock(sk);
1699 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1700 : iucv->msglimit; /* default */
1701 release_sock(sk);
1702 break;
1703 case SO_MSGSIZE:
1704 if (sk->sk_state == IUCV_OPEN)
1705 return -EBADFD;
1706 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1707 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1708 0x7fffffff;
1709 break;
1710 default:
1711 return -ENOPROTOOPT;
1712 }
1713
1714 if (put_user(len, optlen))
1715 return -EFAULT;
1716 if (copy_to_user(optval, &val, len))
1717 return -EFAULT;
1718
1719 return 0;
1720 }
1721
1722
1723 /* Callback wrappers - called from iucv base support */
1724 static int iucv_callback_connreq(struct iucv_path *path,
1725 u8 ipvmid[8], u8 ipuser[16])
1726 {
1727 unsigned char user_data[16];
1728 unsigned char nuser_data[16];
1729 unsigned char src_name[8];
1730 struct sock *sk, *nsk;
1731 struct iucv_sock *iucv, *niucv;
1732 int err;
1733
1734 memcpy(src_name, ipuser, 8);
1735 EBCASC(src_name, 8);
1736 /* Find out if this path belongs to af_iucv. */
1737 read_lock(&iucv_sk_list.lock);
1738 iucv = NULL;
1739 sk = NULL;
1740 sk_for_each(sk, &iucv_sk_list.head)
1741 if (sk->sk_state == IUCV_LISTEN &&
1742 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1743 /*
1744 * Found a listening socket with
1745 * src_name == ipuser[0-7].
1746 */
1747 iucv = iucv_sk(sk);
1748 break;
1749 }
1750 read_unlock(&iucv_sk_list.lock);
1751 if (!iucv)
1752 /* No socket found, not one of our paths. */
1753 return -EINVAL;
1754
1755 bh_lock_sock(sk);
1756
1757 /* Check if parent socket is listening */
1758 low_nmcpy(user_data, iucv->src_name);
1759 high_nmcpy(user_data, iucv->dst_name);
1760 ASCEBC(user_data, sizeof(user_data));
1761 if (sk->sk_state != IUCV_LISTEN) {
1762 err = pr_iucv->path_sever(path, user_data);
1763 iucv_path_free(path);
1764 goto fail;
1765 }
1766
1767 /* Check for backlog size */
1768 if (sk_acceptq_is_full(sk)) {
1769 err = pr_iucv->path_sever(path, user_data);
1770 iucv_path_free(path);
1771 goto fail;
1772 }
1773
1774 /* Create the new socket */
1775 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1776 if (!nsk) {
1777 err = pr_iucv->path_sever(path, user_data);
1778 iucv_path_free(path);
1779 goto fail;
1780 }
1781
1782 niucv = iucv_sk(nsk);
1783 iucv_sock_init(nsk, sk);
1784
1785 /* Set the new iucv_sock */
1786 memcpy(niucv->dst_name, ipuser + 8, 8);
1787 EBCASC(niucv->dst_name, 8);
1788 memcpy(niucv->dst_user_id, ipvmid, 8);
1789 memcpy(niucv->src_name, iucv->src_name, 8);
1790 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1791 niucv->path = path;
1792
1793 /* Call iucv_accept */
1794 high_nmcpy(nuser_data, ipuser + 8);
1795 memcpy(nuser_data + 8, niucv->src_name, 8);
1796 ASCEBC(nuser_data + 8, 8);
1797
1798 /* set message limit for path based on msglimit of accepting socket */
1799 niucv->msglimit = iucv->msglimit;
1800 path->msglim = iucv->msglimit;
1801 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1802 if (err) {
1803 iucv_sever_path(nsk, 1);
1804 iucv_sock_kill(nsk);
1805 goto fail;
1806 }
1807
1808 iucv_accept_enqueue(sk, nsk);
1809
1810 /* Wake up accept */
1811 nsk->sk_state = IUCV_CONNECTED;
1812 sk->sk_data_ready(sk);
1813 err = 0;
1814 fail:
1815 bh_unlock_sock(sk);
1816 return 0;
1817 }
1818
1819 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1820 {
1821 struct sock *sk = path->private;
1822
1823 sk->sk_state = IUCV_CONNECTED;
1824 sk->sk_state_change(sk);
1825 }
1826
1827 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1828 {
1829 struct sock *sk = path->private;
1830 struct iucv_sock *iucv = iucv_sk(sk);
1831 struct sk_buff *skb;
1832 struct sock_msg_q *save_msg;
1833 int len;
1834
1835 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1836 pr_iucv->message_reject(path, msg);
1837 return;
1838 }
1839
1840 spin_lock(&iucv->message_q.lock);
1841
1842 if (!list_empty(&iucv->message_q.list) ||
1843 !skb_queue_empty(&iucv->backlog_skb_q))
1844 goto save_message;
1845
1846 len = atomic_read(&sk->sk_rmem_alloc);
1847 len += SKB_TRUESIZE(iucv_msg_length(msg));
1848 if (len > sk->sk_rcvbuf)
1849 goto save_message;
1850
1851 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1852 if (!skb)
1853 goto save_message;
1854
1855 iucv_process_message(sk, skb, path, msg);
1856 goto out_unlock;
1857
1858 save_message:
1859 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1860 if (!save_msg)
1861 goto out_unlock;
1862 save_msg->path = path;
1863 save_msg->msg = *msg;
1864
1865 list_add_tail(&save_msg->list, &iucv->message_q.list);
1866
1867 out_unlock:
1868 spin_unlock(&iucv->message_q.lock);
1869 }
1870
1871 static void iucv_callback_txdone(struct iucv_path *path,
1872 struct iucv_message *msg)
1873 {
1874 struct sock *sk = path->private;
1875 struct sk_buff *this = NULL;
1876 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1877 struct sk_buff *list_skb;
1878 unsigned long flags;
1879
1880 bh_lock_sock(sk);
1881
1882 spin_lock_irqsave(&list->lock, flags);
1883 skb_queue_walk(list, list_skb) {
1884 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1885 this = list_skb;
1886 break;
1887 }
1888 }
1889 if (this)
1890 __skb_unlink(this, list);
1891 spin_unlock_irqrestore(&list->lock, flags);
1892
1893 if (this) {
1894 kfree_skb(this);
1895 /* wake up any process waiting for sending */
1896 iucv_sock_wake_msglim(sk);
1897 }
1898
1899 if (sk->sk_state == IUCV_CLOSING) {
1900 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1901 sk->sk_state = IUCV_CLOSED;
1902 sk->sk_state_change(sk);
1903 }
1904 }
1905 bh_unlock_sock(sk);
1906
1907 }
1908
1909 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1910 {
1911 struct sock *sk = path->private;
1912
1913 if (sk->sk_state == IUCV_CLOSED)
1914 return;
1915
1916 bh_lock_sock(sk);
1917 iucv_sever_path(sk, 1);
1918 sk->sk_state = IUCV_DISCONN;
1919
1920 sk->sk_state_change(sk);
1921 bh_unlock_sock(sk);
1922 }
1923
1924 /* called if the other communication side shuts down its RECV direction;
1925 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1926 */
1927 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1928 {
1929 struct sock *sk = path->private;
1930
1931 bh_lock_sock(sk);
1932 if (sk->sk_state != IUCV_CLOSED) {
1933 sk->sk_shutdown |= SEND_SHUTDOWN;
1934 sk->sk_state_change(sk);
1935 }
1936 bh_unlock_sock(sk);
1937 }
1938
1939 /***************** HiperSockets transport callbacks ********************/
1940 static void afiucv_swap_src_dest(struct sk_buff *skb)
1941 {
1942 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1943 char tmpID[8];
1944 char tmpName[8];
1945
1946 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1947 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1948 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1949 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1950 memcpy(tmpID, trans_hdr->srcUserID, 8);
1951 memcpy(tmpName, trans_hdr->srcAppName, 8);
1952 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1953 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1954 memcpy(trans_hdr->destUserID, tmpID, 8);
1955 memcpy(trans_hdr->destAppName, tmpName, 8);
1956 skb_push(skb, ETH_HLEN);
1957 memset(skb->data, 0, ETH_HLEN);
1958 }
1959
1960 /**
1961 * afiucv_hs_callback_syn - react on received SYN
1962 **/
1963 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1964 {
1965 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1966 struct sock *nsk;
1967 struct iucv_sock *iucv, *niucv;
1968 int err;
1969
1970 iucv = iucv_sk(sk);
1971 if (!iucv) {
1972 /* no sock - connection refused */
1973 afiucv_swap_src_dest(skb);
1974 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1975 err = dev_queue_xmit(skb);
1976 goto out;
1977 }
1978
1979 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1980 bh_lock_sock(sk);
1981 if ((sk->sk_state != IUCV_LISTEN) ||
1982 sk_acceptq_is_full(sk) ||
1983 !nsk) {
1984 /* error on server socket - connection refused */
1985 afiucv_swap_src_dest(skb);
1986 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1987 err = dev_queue_xmit(skb);
1988 iucv_sock_kill(nsk);
1989 bh_unlock_sock(sk);
1990 goto out;
1991 }
1992
1993 niucv = iucv_sk(nsk);
1994 iucv_sock_init(nsk, sk);
1995 niucv->transport = AF_IUCV_TRANS_HIPER;
1996 niucv->msglimit = iucv->msglimit;
1997 if (!trans_hdr->window)
1998 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1999 else
2000 niucv->msglimit_peer = trans_hdr->window;
2001 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
2002 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2003 memcpy(niucv->src_name, iucv->src_name, 8);
2004 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2005 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2006 niucv->hs_dev = iucv->hs_dev;
2007 dev_hold(niucv->hs_dev);
2008 afiucv_swap_src_dest(skb);
2009 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2010 trans_hdr->window = niucv->msglimit;
2011 /* if receiver acks the xmit connection is established */
2012 err = dev_queue_xmit(skb);
2013 if (!err) {
2014 iucv_accept_enqueue(sk, nsk);
2015 nsk->sk_state = IUCV_CONNECTED;
2016 sk->sk_data_ready(sk);
2017 } else
2018 iucv_sock_kill(nsk);
2019 bh_unlock_sock(sk);
2020
2021 out:
2022 return NET_RX_SUCCESS;
2023 }
2024
2025 /**
2026 * afiucv_hs_callback_synack() - react on received SYN-ACK
2027 **/
2028 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2029 {
2030 struct iucv_sock *iucv = iucv_sk(sk);
2031
2032 if (!iucv)
2033 goto out;
2034 if (sk->sk_state != IUCV_BOUND)
2035 goto out;
2036 bh_lock_sock(sk);
2037 iucv->msglimit_peer = iucv_trans_hdr(skb)->window;
2038 sk->sk_state = IUCV_CONNECTED;
2039 sk->sk_state_change(sk);
2040 bh_unlock_sock(sk);
2041 out:
2042 kfree_skb(skb);
2043 return NET_RX_SUCCESS;
2044 }
2045
2046 /**
2047 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2048 **/
2049 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2050 {
2051 struct iucv_sock *iucv = iucv_sk(sk);
2052
2053 if (!iucv)
2054 goto out;
2055 if (sk->sk_state != IUCV_BOUND)
2056 goto out;
2057 bh_lock_sock(sk);
2058 sk->sk_state = IUCV_DISCONN;
2059 sk->sk_state_change(sk);
2060 bh_unlock_sock(sk);
2061 out:
2062 kfree_skb(skb);
2063 return NET_RX_SUCCESS;
2064 }
2065
2066 /**
2067 * afiucv_hs_callback_fin() - react on received FIN
2068 **/
2069 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2070 {
2071 struct iucv_sock *iucv = iucv_sk(sk);
2072
2073 /* other end of connection closed */
2074 if (!iucv)
2075 goto out;
2076 bh_lock_sock(sk);
2077 if (sk->sk_state == IUCV_CONNECTED) {
2078 sk->sk_state = IUCV_DISCONN;
2079 sk->sk_state_change(sk);
2080 }
2081 bh_unlock_sock(sk);
2082 out:
2083 kfree_skb(skb);
2084 return NET_RX_SUCCESS;
2085 }
2086
2087 /**
2088 * afiucv_hs_callback_win() - react on received WIN
2089 **/
2090 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2091 {
2092 struct iucv_sock *iucv = iucv_sk(sk);
2093
2094 if (!iucv)
2095 return NET_RX_SUCCESS;
2096
2097 if (sk->sk_state != IUCV_CONNECTED)
2098 return NET_RX_SUCCESS;
2099
2100 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent);
2101 iucv_sock_wake_msglim(sk);
2102 return NET_RX_SUCCESS;
2103 }
2104
2105 /**
2106 * afiucv_hs_callback_rx() - react on received data
2107 **/
2108 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2109 {
2110 struct iucv_sock *iucv = iucv_sk(sk);
2111
2112 if (!iucv) {
2113 kfree_skb(skb);
2114 return NET_RX_SUCCESS;
2115 }
2116
2117 if (sk->sk_state != IUCV_CONNECTED) {
2118 kfree_skb(skb);
2119 return NET_RX_SUCCESS;
2120 }
2121
2122 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2123 kfree_skb(skb);
2124 return NET_RX_SUCCESS;
2125 }
2126
2127 /* write stuff from iucv_msg to skb cb */
2128 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2129 skb_reset_transport_header(skb);
2130 skb_reset_network_header(skb);
2131 IUCV_SKB_CB(skb)->offset = 0;
2132 if (sk_filter(sk, skb)) {
2133 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2134 kfree_skb(skb);
2135 return NET_RX_SUCCESS;
2136 }
2137
2138 spin_lock(&iucv->message_q.lock);
2139 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2140 if (__sock_queue_rcv_skb(sk, skb))
2141 /* handle rcv queue full */
2142 skb_queue_tail(&iucv->backlog_skb_q, skb);
2143 } else
2144 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2145 spin_unlock(&iucv->message_q.lock);
2146 return NET_RX_SUCCESS;
2147 }
2148
2149 /**
2150 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2151 * transport
2152 * called from netif RX softirq
2153 **/
2154 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2155 struct packet_type *pt, struct net_device *orig_dev)
2156 {
2157 struct sock *sk;
2158 struct iucv_sock *iucv;
2159 struct af_iucv_trans_hdr *trans_hdr;
2160 int err = NET_RX_SUCCESS;
2161 char nullstring[8];
2162
2163 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) {
2164 WARN_ONCE(1, "AF_IUCV failed to receive skb, len=%u", skb->len);
2165 kfree_skb(skb);
2166 return NET_RX_SUCCESS;
2167 }
2168
2169 trans_hdr = iucv_trans_hdr(skb);
2170 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2171 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2172 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2173 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2174 memset(nullstring, 0, sizeof(nullstring));
2175 iucv = NULL;
2176 sk = NULL;
2177 read_lock(&iucv_sk_list.lock);
2178 sk_for_each(sk, &iucv_sk_list.head) {
2179 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2180 if ((!memcmp(&iucv_sk(sk)->src_name,
2181 trans_hdr->destAppName, 8)) &&
2182 (!memcmp(&iucv_sk(sk)->src_user_id,
2183 trans_hdr->destUserID, 8)) &&
2184 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2185 (!memcmp(&iucv_sk(sk)->dst_user_id,
2186 nullstring, 8))) {
2187 iucv = iucv_sk(sk);
2188 break;
2189 }
2190 } else {
2191 if ((!memcmp(&iucv_sk(sk)->src_name,
2192 trans_hdr->destAppName, 8)) &&
2193 (!memcmp(&iucv_sk(sk)->src_user_id,
2194 trans_hdr->destUserID, 8)) &&
2195 (!memcmp(&iucv_sk(sk)->dst_name,
2196 trans_hdr->srcAppName, 8)) &&
2197 (!memcmp(&iucv_sk(sk)->dst_user_id,
2198 trans_hdr->srcUserID, 8))) {
2199 iucv = iucv_sk(sk);
2200 break;
2201 }
2202 }
2203 }
2204 read_unlock(&iucv_sk_list.lock);
2205 if (!iucv)
2206 sk = NULL;
2207
2208 /* no sock
2209 how should we send with no sock
2210 1) send without sock no send rc checking?
2211 2) introduce default sock to handle this cases
2212
2213 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2214 data -> send FIN
2215 SYN|ACK, SYN|FIN, FIN -> no action? */
2216
2217 switch (trans_hdr->flags) {
2218 case AF_IUCV_FLAG_SYN:
2219 /* connect request */
2220 err = afiucv_hs_callback_syn(sk, skb);
2221 break;
2222 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2223 /* connect request confirmed */
2224 err = afiucv_hs_callback_synack(sk, skb);
2225 break;
2226 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2227 /* connect request refused */
2228 err = afiucv_hs_callback_synfin(sk, skb);
2229 break;
2230 case (AF_IUCV_FLAG_FIN):
2231 /* close request */
2232 err = afiucv_hs_callback_fin(sk, skb);
2233 break;
2234 case (AF_IUCV_FLAG_WIN):
2235 err = afiucv_hs_callback_win(sk, skb);
2236 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2237 kfree_skb(skb);
2238 break;
2239 }
2240 /* fall through and receive non-zero length data */
2241 case (AF_IUCV_FLAG_SHT):
2242 /* shutdown request */
2243 /* fall through and receive zero length data */
2244 case 0:
2245 /* plain data frame */
2246 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2247 err = afiucv_hs_callback_rx(sk, skb);
2248 break;
2249 default:
2250 kfree_skb(skb);
2251 }
2252
2253 return err;
2254 }
2255
2256 /**
2257 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2258 * transport
2259 **/
2260 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2261 enum iucv_tx_notify n)
2262 {
2263 struct sock *isk = skb->sk;
2264 struct sock *sk = NULL;
2265 struct iucv_sock *iucv = NULL;
2266 struct sk_buff_head *list;
2267 struct sk_buff *list_skb;
2268 struct sk_buff *nskb;
2269 unsigned long flags;
2270
2271 read_lock_irqsave(&iucv_sk_list.lock, flags);
2272 sk_for_each(sk, &iucv_sk_list.head)
2273 if (sk == isk) {
2274 iucv = iucv_sk(sk);
2275 break;
2276 }
2277 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2278
2279 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2280 return;
2281
2282 list = &iucv->send_skb_q;
2283 spin_lock_irqsave(&list->lock, flags);
2284 skb_queue_walk_safe(list, list_skb, nskb) {
2285 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2286 switch (n) {
2287 case TX_NOTIFY_OK:
2288 __skb_unlink(list_skb, list);
2289 kfree_skb(list_skb);
2290 iucv_sock_wake_msglim(sk);
2291 break;
2292 case TX_NOTIFY_PENDING:
2293 atomic_inc(&iucv->pendings);
2294 break;
2295 case TX_NOTIFY_DELAYED_OK:
2296 __skb_unlink(list_skb, list);
2297 atomic_dec(&iucv->pendings);
2298 if (atomic_read(&iucv->pendings) <= 0)
2299 iucv_sock_wake_msglim(sk);
2300 kfree_skb(list_skb);
2301 break;
2302 case TX_NOTIFY_UNREACHABLE:
2303 case TX_NOTIFY_DELAYED_UNREACHABLE:
2304 case TX_NOTIFY_TPQFULL: /* not yet used */
2305 case TX_NOTIFY_GENERALERROR:
2306 case TX_NOTIFY_DELAYED_GENERALERROR:
2307 __skb_unlink(list_skb, list);
2308 kfree_skb(list_skb);
2309 if (sk->sk_state == IUCV_CONNECTED) {
2310 sk->sk_state = IUCV_DISCONN;
2311 sk->sk_state_change(sk);
2312 }
2313 break;
2314 }
2315 break;
2316 }
2317 }
2318 spin_unlock_irqrestore(&list->lock, flags);
2319
2320 if (sk->sk_state == IUCV_CLOSING) {
2321 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2322 sk->sk_state = IUCV_CLOSED;
2323 sk->sk_state_change(sk);
2324 }
2325 }
2326
2327 }
2328
2329 /*
2330 * afiucv_netdev_event: handle netdev notifier chain events
2331 */
2332 static int afiucv_netdev_event(struct notifier_block *this,
2333 unsigned long event, void *ptr)
2334 {
2335 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2336 struct sock *sk;
2337 struct iucv_sock *iucv;
2338
2339 switch (event) {
2340 case NETDEV_REBOOT:
2341 case NETDEV_GOING_DOWN:
2342 sk_for_each(sk, &iucv_sk_list.head) {
2343 iucv = iucv_sk(sk);
2344 if ((iucv->hs_dev == event_dev) &&
2345 (sk->sk_state == IUCV_CONNECTED)) {
2346 if (event == NETDEV_GOING_DOWN)
2347 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2348 sk->sk_state = IUCV_DISCONN;
2349 sk->sk_state_change(sk);
2350 }
2351 }
2352 break;
2353 case NETDEV_DOWN:
2354 case NETDEV_UNREGISTER:
2355 default:
2356 break;
2357 }
2358 return NOTIFY_DONE;
2359 }
2360
2361 static struct notifier_block afiucv_netdev_notifier = {
2362 .notifier_call = afiucv_netdev_event,
2363 };
2364
2365 static const struct proto_ops iucv_sock_ops = {
2366 .family = PF_IUCV,
2367 .owner = THIS_MODULE,
2368 .release = iucv_sock_release,
2369 .bind = iucv_sock_bind,
2370 .connect = iucv_sock_connect,
2371 .listen = iucv_sock_listen,
2372 .accept = iucv_sock_accept,
2373 .getname = iucv_sock_getname,
2374 .sendmsg = iucv_sock_sendmsg,
2375 .recvmsg = iucv_sock_recvmsg,
2376 .poll = iucv_sock_poll,
2377 .ioctl = sock_no_ioctl,
2378 .mmap = sock_no_mmap,
2379 .socketpair = sock_no_socketpair,
2380 .shutdown = iucv_sock_shutdown,
2381 .setsockopt = iucv_sock_setsockopt,
2382 .getsockopt = iucv_sock_getsockopt,
2383 };
2384
2385 static const struct net_proto_family iucv_sock_family_ops = {
2386 .family = AF_IUCV,
2387 .owner = THIS_MODULE,
2388 .create = iucv_sock_create,
2389 };
2390
2391 static struct packet_type iucv_packet_type = {
2392 .type = cpu_to_be16(ETH_P_AF_IUCV),
2393 .func = afiucv_hs_rcv,
2394 };
2395
2396 static int afiucv_iucv_init(void)
2397 {
2398 int err;
2399
2400 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2401 if (err)
2402 goto out;
2403 /* establish dummy device */
2404 af_iucv_driver.bus = pr_iucv->bus;
2405 err = driver_register(&af_iucv_driver);
2406 if (err)
2407 goto out_iucv;
2408 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2409 if (!af_iucv_dev) {
2410 err = -ENOMEM;
2411 goto out_driver;
2412 }
2413 dev_set_name(af_iucv_dev, "af_iucv");
2414 af_iucv_dev->bus = pr_iucv->bus;
2415 af_iucv_dev->parent = pr_iucv->root;
2416 af_iucv_dev->release = (void (*)(struct device *))kfree;
2417 af_iucv_dev->driver = &af_iucv_driver;
2418 err = device_register(af_iucv_dev);
2419 if (err)
2420 goto out_iucv_dev;
2421 return 0;
2422
2423 out_iucv_dev:
2424 put_device(af_iucv_dev);
2425 out_driver:
2426 driver_unregister(&af_iucv_driver);
2427 out_iucv:
2428 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2429 out:
2430 return err;
2431 }
2432
2433 static int __init afiucv_init(void)
2434 {
2435 int err;
2436
2437 if (MACHINE_IS_VM) {
2438 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2439 if (unlikely(err)) {
2440 WARN_ON(err);
2441 err = -EPROTONOSUPPORT;
2442 goto out;
2443 }
2444
2445 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2446 if (!pr_iucv) {
2447 printk(KERN_WARNING "iucv_if lookup failed\n");
2448 memset(&iucv_userid, 0, sizeof(iucv_userid));
2449 }
2450 } else {
2451 memset(&iucv_userid, 0, sizeof(iucv_userid));
2452 pr_iucv = NULL;
2453 }
2454
2455 err = proto_register(&iucv_proto, 0);
2456 if (err)
2457 goto out;
2458 err = sock_register(&iucv_sock_family_ops);
2459 if (err)
2460 goto out_proto;
2461
2462 if (pr_iucv) {
2463 err = afiucv_iucv_init();
2464 if (err)
2465 goto out_sock;
2466 } else
2467 register_netdevice_notifier(&afiucv_netdev_notifier);
2468 dev_add_pack(&iucv_packet_type);
2469 return 0;
2470
2471 out_sock:
2472 sock_unregister(PF_IUCV);
2473 out_proto:
2474 proto_unregister(&iucv_proto);
2475 out:
2476 if (pr_iucv)
2477 symbol_put(iucv_if);
2478 return err;
2479 }
2480
2481 static void __exit afiucv_exit(void)
2482 {
2483 if (pr_iucv) {
2484 device_unregister(af_iucv_dev);
2485 driver_unregister(&af_iucv_driver);
2486 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2487 symbol_put(iucv_if);
2488 } else
2489 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2490 dev_remove_pack(&iucv_packet_type);
2491 sock_unregister(PF_IUCV);
2492 proto_unregister(&iucv_proto);
2493 }
2494
2495 module_init(afiucv_init);
2496 module_exit(afiucv_exit);
2497
2498 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2499 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2500 MODULE_VERSION(VERSION);
2501 MODULE_LICENSE("GPL");
2502 MODULE_ALIAS_NETPROTO(PF_IUCV);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git