?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
xfs: add full xfs_dqblk verifier
[linux/fpc-iii.git] / net / iucv / af_iucv.c
blob893a022f962081416fa1b9e5f96416a8c2e92e5c
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 return -ENODEV;
357 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
358 return -ENETDOWN;
359 if (skb->len > skb->dev->mtu) {
360 if (sock->sk_type == SOCK_SEQPACKET)
361 return -EMSGSIZE;
362 else
363 skb_trim(skb, skb->dev->mtu);
364 }
365 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
366 nskb = skb_clone(skb, GFP_ATOMIC);
367 if (!nskb)
368 return -ENOMEM;
369 skb_queue_tail(&iucv->send_skb_q, nskb);
370 err = dev_queue_xmit(skb);
371 if (net_xmit_eval(err)) {
372 skb_unlink(nskb, &iucv->send_skb_q);
373 kfree_skb(nskb);
374 } else {
375 atomic_sub(confirm_recv, &iucv->msg_recv);
376 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
377 }
378 return net_xmit_eval(err);
379 }
380
381 static struct sock *__iucv_get_sock_by_name(char *nm)
382 {
383 struct sock *sk;
384
385 sk_for_each(sk, &iucv_sk_list.head)
386 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
387 return sk;
388
389 return NULL;
390 }
391
392 static void iucv_sock_destruct(struct sock *sk)
393 {
394 skb_queue_purge(&sk->sk_receive_queue);
395 skb_queue_purge(&sk->sk_error_queue);
396
397 sk_mem_reclaim(sk);
398
399 if (!sock_flag(sk, SOCK_DEAD)) {
400 pr_err("Attempt to release alive iucv socket %p\n", sk);
401 return;
402 }
403
404 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
405 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
406 WARN_ON(sk->sk_wmem_queued);
407 WARN_ON(sk->sk_forward_alloc);
408 }
409
410 /* Cleanup Listen */
411 static void iucv_sock_cleanup_listen(struct sock *parent)
412 {
413 struct sock *sk;
414
415 /* Close non-accepted connections */
416 while ((sk = iucv_accept_dequeue(parent, NULL))) {
417 iucv_sock_close(sk);
418 iucv_sock_kill(sk);
419 }
420
421 parent->sk_state = IUCV_CLOSED;
422 }
423
424 /* Kill socket (only if zapped and orphaned) */
425 static void iucv_sock_kill(struct sock *sk)
426 {
427 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
428 return;
429
430 iucv_sock_unlink(&iucv_sk_list, sk);
431 sock_set_flag(sk, SOCK_DEAD);
432 sock_put(sk);
433 }
434
435 /* Terminate an IUCV path */
436 static void iucv_sever_path(struct sock *sk, int with_user_data)
437 {
438 unsigned char user_data[16];
439 struct iucv_sock *iucv = iucv_sk(sk);
440 struct iucv_path *path = iucv->path;
441
442 if (iucv->path) {
443 iucv->path = NULL;
444 if (with_user_data) {
445 low_nmcpy(user_data, iucv->src_name);
446 high_nmcpy(user_data, iucv->dst_name);
447 ASCEBC(user_data, sizeof(user_data));
448 pr_iucv->path_sever(path, user_data);
449 } else
450 pr_iucv->path_sever(path, NULL);
451 iucv_path_free(path);
452 }
453 }
454
455 /* Send controlling flags through an IUCV socket for HIPER transport */
456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
457 {
458 int err = 0;
459 int blen;
460 struct sk_buff *skb;
461 u8 shutdown = 0;
462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 if (sk->sk_shutdown & SEND_SHUTDOWN) {
465 /* controlling flags should be sent anyway */
466 shutdown = sk->sk_shutdown;
467 sk->sk_shutdown &= RCV_SHUTDOWN;
468 }
469 skb = sock_alloc_send_skb(sk, blen, 1, &err);
470 if (skb) {
471 skb_reserve(skb, blen);
472 err = afiucv_hs_send(NULL, sk, skb, flags);
473 }
474 if (shutdown)
475 sk->sk_shutdown = shutdown;
476 return err;
477 }
478
479 /* Close an IUCV socket */
480 static void iucv_sock_close(struct sock *sk)
481 {
482 struct iucv_sock *iucv = iucv_sk(sk);
483 unsigned long timeo;
484 int err = 0;
485
486 lock_sock(sk);
487
488 switch (sk->sk_state) {
489 case IUCV_LISTEN:
490 iucv_sock_cleanup_listen(sk);
491 break;
492
493 case IUCV_CONNECTED:
494 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
495 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
496 sk->sk_state = IUCV_DISCONN;
497 sk->sk_state_change(sk);
498 }
499 case IUCV_DISCONN: /* fall through */
500 sk->sk_state = IUCV_CLOSING;
501 sk->sk_state_change(sk);
502
503 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
504 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
505 timeo = sk->sk_lingertime;
506 else
507 timeo = IUCV_DISCONN_TIMEOUT;
508 iucv_sock_wait(sk,
509 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
510 timeo);
511 }
512
513 case IUCV_CLOSING: /* fall through */
514 sk->sk_state = IUCV_CLOSED;
515 sk->sk_state_change(sk);
516
517 sk->sk_err = ECONNRESET;
518 sk->sk_state_change(sk);
519
520 skb_queue_purge(&iucv->send_skb_q);
521 skb_queue_purge(&iucv->backlog_skb_q);
522
523 default: /* fall through */
524 iucv_sever_path(sk, 1);
525 }
526
527 if (iucv->hs_dev) {
528 dev_put(iucv->hs_dev);
529 iucv->hs_dev = NULL;
530 sk->sk_bound_dev_if = 0;
531 }
532
533 /* mark socket for deletion by iucv_sock_kill() */
534 sock_set_flag(sk, SOCK_ZAPPED);
535
536 release_sock(sk);
537 }
538
539 static void iucv_sock_init(struct sock *sk, struct sock *parent)
540 {
541 if (parent) {
542 sk->sk_type = parent->sk_type;
543 security_sk_clone(parent, sk);
544 }
545 }
546
547 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
548 {
549 struct sock *sk;
550 struct iucv_sock *iucv;
551
552 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
553 if (!sk)
554 return NULL;
555 iucv = iucv_sk(sk);
556
557 sock_init_data(sock, sk);
558 INIT_LIST_HEAD(&iucv->accept_q);
559 spin_lock_init(&iucv->accept_q_lock);
560 skb_queue_head_init(&iucv->send_skb_q);
561 INIT_LIST_HEAD(&iucv->message_q.list);
562 spin_lock_init(&iucv->message_q.lock);
563 skb_queue_head_init(&iucv->backlog_skb_q);
564 iucv->send_tag = 0;
565 atomic_set(&iucv->pendings, 0);
566 iucv->flags = 0;
567 iucv->msglimit = 0;
568 atomic_set(&iucv->msg_sent, 0);
569 atomic_set(&iucv->msg_recv, 0);
570 iucv->path = NULL;
571 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
572 memset(&iucv->src_user_id , 0, 32);
573 if (pr_iucv)
574 iucv->transport = AF_IUCV_TRANS_IUCV;
575 else
576 iucv->transport = AF_IUCV_TRANS_HIPER;
577
578 sk->sk_destruct = iucv_sock_destruct;
579 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
580 sk->sk_allocation = GFP_DMA;
581
582 sock_reset_flag(sk, SOCK_ZAPPED);
583
584 sk->sk_protocol = proto;
585 sk->sk_state = IUCV_OPEN;
586
587 iucv_sock_link(&iucv_sk_list, sk);
588 return sk;
589 }
590
591 /* Create an IUCV socket */
592 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
593 int kern)
594 {
595 struct sock *sk;
596
597 if (protocol && protocol != PF_IUCV)
598 return -EPROTONOSUPPORT;
599
600 sock->state = SS_UNCONNECTED;
601
602 switch (sock->type) {
603 case SOCK_STREAM:
604 sock->ops = &iucv_sock_ops;
605 break;
606 case SOCK_SEQPACKET:
607 /* currently, proto ops can handle both sk types */
608 sock->ops = &iucv_sock_ops;
609 break;
610 default:
611 return -ESOCKTNOSUPPORT;
612 }
613
614 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
615 if (!sk)
616 return -ENOMEM;
617
618 iucv_sock_init(sk, NULL);
619
620 return 0;
621 }
622
623 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
624 {
625 write_lock_bh(&l->lock);
626 sk_add_node(sk, &l->head);
627 write_unlock_bh(&l->lock);
628 }
629
630 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
631 {
632 write_lock_bh(&l->lock);
633 sk_del_node_init(sk);
634 write_unlock_bh(&l->lock);
635 }
636
637 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
638 {
639 unsigned long flags;
640 struct iucv_sock *par = iucv_sk(parent);
641
642 sock_hold(sk);
643 spin_lock_irqsave(&par->accept_q_lock, flags);
644 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
645 spin_unlock_irqrestore(&par->accept_q_lock, flags);
646 iucv_sk(sk)->parent = parent;
647 sk_acceptq_added(parent);
648 }
649
650 void iucv_accept_unlink(struct sock *sk)
651 {
652 unsigned long flags;
653 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
654
655 spin_lock_irqsave(&par->accept_q_lock, flags);
656 list_del_init(&iucv_sk(sk)->accept_q);
657 spin_unlock_irqrestore(&par->accept_q_lock, flags);
658 sk_acceptq_removed(iucv_sk(sk)->parent);
659 iucv_sk(sk)->parent = NULL;
660 sock_put(sk);
661 }
662
663 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
664 {
665 struct iucv_sock *isk, *n;
666 struct sock *sk;
667
668 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
669 sk = (struct sock *) isk;
670 lock_sock(sk);
671
672 if (sk->sk_state == IUCV_CLOSED) {
673 iucv_accept_unlink(sk);
674 release_sock(sk);
675 continue;
676 }
677
678 if (sk->sk_state == IUCV_CONNECTED ||
679 sk->sk_state == IUCV_DISCONN ||
680 !newsock) {
681 iucv_accept_unlink(sk);
682 if (newsock)
683 sock_graft(sk, newsock);
684
685 release_sock(sk);
686 return sk;
687 }
688
689 release_sock(sk);
690 }
691 return NULL;
692 }
693
694 static void __iucv_auto_name(struct iucv_sock *iucv)
695 {
696 char name[12];
697
698 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
699 while (__iucv_get_sock_by_name(name)) {
700 sprintf(name, "%08x",
701 atomic_inc_return(&iucv_sk_list.autobind_name));
702 }
703 memcpy(iucv->src_name, name, 8);
704 }
705
706 /* Bind an unbound socket */
707 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
708 int addr_len)
709 {
710 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
711 struct sock *sk = sock->sk;
712 struct iucv_sock *iucv;
713 int err = 0;
714 struct net_device *dev;
715 char uid[9];
716
717 /* Verify the input sockaddr */
718 if (addr_len < sizeof(struct sockaddr_iucv) ||
719 addr->sa_family != AF_IUCV)
720 return -EINVAL;
721
722 lock_sock(sk);
723 if (sk->sk_state != IUCV_OPEN) {
724 err = -EBADFD;
725 goto done;
726 }
727
728 write_lock_bh(&iucv_sk_list.lock);
729
730 iucv = iucv_sk(sk);
731 if (__iucv_get_sock_by_name(sa->siucv_name)) {
732 err = -EADDRINUSE;
733 goto done_unlock;
734 }
735 if (iucv->path)
736 goto done_unlock;
737
738 /* Bind the socket */
739 if (pr_iucv)
740 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
741 goto vm_bind; /* VM IUCV transport */
742
743 /* try hiper transport */
744 memcpy(uid, sa->siucv_user_id, sizeof(uid));
745 ASCEBC(uid, 8);
746 rcu_read_lock();
747 for_each_netdev_rcu(&init_net, dev) {
748 if (!memcmp(dev->perm_addr, uid, 8)) {
749 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
750 /* Check for unitialized siucv_name */
751 if (strncmp(sa->siucv_name, " ", 8) == 0)
752 __iucv_auto_name(iucv);
753 else
754 memcpy(iucv->src_name, sa->siucv_name, 8);
755 sk->sk_bound_dev_if = dev->ifindex;
756 iucv->hs_dev = dev;
757 dev_hold(dev);
758 sk->sk_state = IUCV_BOUND;
759 iucv->transport = AF_IUCV_TRANS_HIPER;
760 if (!iucv->msglimit)
761 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
762 rcu_read_unlock();
763 goto done_unlock;
764 }
765 }
766 rcu_read_unlock();
767 vm_bind:
768 if (pr_iucv) {
769 /* use local userid for backward compat */
770 memcpy(iucv->src_name, sa->siucv_name, 8);
771 memcpy(iucv->src_user_id, iucv_userid, 8);
772 sk->sk_state = IUCV_BOUND;
773 iucv->transport = AF_IUCV_TRANS_IUCV;
774 if (!iucv->msglimit)
775 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
776 goto done_unlock;
777 }
778 /* found no dev to bind */
779 err = -ENODEV;
780 done_unlock:
781 /* Release the socket list lock */
782 write_unlock_bh(&iucv_sk_list.lock);
783 done:
784 release_sock(sk);
785 return err;
786 }
787
788 /* Automatically bind an unbound socket */
789 static int iucv_sock_autobind(struct sock *sk)
790 {
791 struct iucv_sock *iucv = iucv_sk(sk);
792 int err = 0;
793
794 if (unlikely(!pr_iucv))
795 return -EPROTO;
796
797 memcpy(iucv->src_user_id, iucv_userid, 8);
798
799 write_lock_bh(&iucv_sk_list.lock);
800 __iucv_auto_name(iucv);
801 write_unlock_bh(&iucv_sk_list.lock);
802
803 if (!iucv->msglimit)
804 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
805
806 return err;
807 }
808
809 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
810 {
811 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
812 struct sock *sk = sock->sk;
813 struct iucv_sock *iucv = iucv_sk(sk);
814 unsigned char user_data[16];
815 int err;
816
817 high_nmcpy(user_data, sa->siucv_name);
818 low_nmcpy(user_data, iucv->src_name);
819 ASCEBC(user_data, sizeof(user_data));
820
821 /* Create path. */
822 iucv->path = iucv_path_alloc(iucv->msglimit,
823 IUCV_IPRMDATA, GFP_KERNEL);
824 if (!iucv->path) {
825 err = -ENOMEM;
826 goto done;
827 }
828 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
829 sa->siucv_user_id, NULL, user_data,
830 sk);
831 if (err) {
832 iucv_path_free(iucv->path);
833 iucv->path = NULL;
834 switch (err) {
835 case 0x0b: /* Target communicator is not logged on */
836 err = -ENETUNREACH;
837 break;
838 case 0x0d: /* Max connections for this guest exceeded */
839 case 0x0e: /* Max connections for target guest exceeded */
840 err = -EAGAIN;
841 break;
842 case 0x0f: /* Missing IUCV authorization */
843 err = -EACCES;
844 break;
845 default:
846 err = -ECONNREFUSED;
847 break;
848 }
849 }
850 done:
851 return err;
852 }
853
854 /* Connect an unconnected socket */
855 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
856 int alen, int flags)
857 {
858 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
859 struct sock *sk = sock->sk;
860 struct iucv_sock *iucv = iucv_sk(sk);
861 int err;
862
863 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
864 return -EINVAL;
865
866 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
867 return -EBADFD;
868
869 if (sk->sk_state == IUCV_OPEN &&
870 iucv->transport == AF_IUCV_TRANS_HIPER)
871 return -EBADFD; /* explicit bind required */
872
873 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
874 return -EINVAL;
875
876 if (sk->sk_state == IUCV_OPEN) {
877 err = iucv_sock_autobind(sk);
878 if (unlikely(err))
879 return err;
880 }
881
882 lock_sock(sk);
883
884 /* Set the destination information */
885 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
886 memcpy(iucv->dst_name, sa->siucv_name, 8);
887
888 if (iucv->transport == AF_IUCV_TRANS_HIPER)
889 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
890 else
891 err = afiucv_path_connect(sock, addr);
892 if (err)
893 goto done;
894
895 if (sk->sk_state != IUCV_CONNECTED)
896 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
897 IUCV_DISCONN),
898 sock_sndtimeo(sk, flags & O_NONBLOCK));
899
900 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
901 err = -ECONNREFUSED;
902
903 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
904 iucv_sever_path(sk, 0);
905
906 done:
907 release_sock(sk);
908 return err;
909 }
910
911 /* Move a socket into listening state. */
912 static int iucv_sock_listen(struct socket *sock, int backlog)
913 {
914 struct sock *sk = sock->sk;
915 int err;
916
917 lock_sock(sk);
918
919 err = -EINVAL;
920 if (sk->sk_state != IUCV_BOUND)
921 goto done;
922
923 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
924 goto done;
925
926 sk->sk_max_ack_backlog = backlog;
927 sk->sk_ack_backlog = 0;
928 sk->sk_state = IUCV_LISTEN;
929 err = 0;
930
931 done:
932 release_sock(sk);
933 return err;
934 }
935
936 /* Accept a pending connection */
937 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
938 int flags, bool kern)
939 {
940 DECLARE_WAITQUEUE(wait, current);
941 struct sock *sk = sock->sk, *nsk;
942 long timeo;
943 int err = 0;
944
945 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
946
947 if (sk->sk_state != IUCV_LISTEN) {
948 err = -EBADFD;
949 goto done;
950 }
951
952 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
953
954 /* Wait for an incoming connection */
955 add_wait_queue_exclusive(sk_sleep(sk), &wait);
956 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
957 set_current_state(TASK_INTERRUPTIBLE);
958 if (!timeo) {
959 err = -EAGAIN;
960 break;
961 }
962
963 release_sock(sk);
964 timeo = schedule_timeout(timeo);
965 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
966
967 if (sk->sk_state != IUCV_LISTEN) {
968 err = -EBADFD;
969 break;
970 }
971
972 if (signal_pending(current)) {
973 err = sock_intr_errno(timeo);
974 break;
975 }
976 }
977
978 set_current_state(TASK_RUNNING);
979 remove_wait_queue(sk_sleep(sk), &wait);
980
981 if (err)
982 goto done;
983
984 newsock->state = SS_CONNECTED;
985
986 done:
987 release_sock(sk);
988 return err;
989 }
990
991 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
992 int peer)
993 {
994 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
995 struct sock *sk = sock->sk;
996 struct iucv_sock *iucv = iucv_sk(sk);
997
998 addr->sa_family = AF_IUCV;
999
1000 if (peer) {
1001 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1002 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1003 } else {
1004 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1005 memcpy(siucv->siucv_name, iucv->src_name, 8);
1006 }
1007 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1008 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1009 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1010
1011 return sizeof(struct sockaddr_iucv);
1012 }
1013
1014 /**
1015 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1016 * @path: IUCV path
1017 * @msg: Pointer to a struct iucv_message
1018 * @skb: The socket data to send, skb->len MUST BE <= 7
1019 *
1020 * Send the socket data in the parameter list in the iucv message
1021 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1022 * list and the socket data len at index 7 (last byte).
1023 * See also iucv_msg_length().
1024 *
1025 * Returns the error code from the iucv_message_send() call.
1026 */
1027 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1028 struct sk_buff *skb)
1029 {
1030 u8 prmdata[8];
1031
1032 memcpy(prmdata, (void *) skb->data, skb->len);
1033 prmdata[7] = 0xff - (u8) skb->len;
1034 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1035 (void *) prmdata, 8);
1036 }
1037
1038 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1039 size_t len)
1040 {
1041 struct sock *sk = sock->sk;
1042 struct iucv_sock *iucv = iucv_sk(sk);
1043 size_t headroom = 0;
1044 size_t linear;
1045 struct sk_buff *skb;
1046 struct iucv_message txmsg = {0};
1047 struct cmsghdr *cmsg;
1048 int cmsg_done;
1049 long timeo;
1050 char user_id[9];
1051 char appl_id[9];
1052 int err;
1053 int noblock = msg->msg_flags & MSG_DONTWAIT;
1054
1055 err = sock_error(sk);
1056 if (err)
1057 return err;
1058
1059 if (msg->msg_flags & MSG_OOB)
1060 return -EOPNOTSUPP;
1061
1062 /* SOCK_SEQPACKET: we do not support segmented records */
1063 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1064 return -EOPNOTSUPP;
1065
1066 lock_sock(sk);
1067
1068 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1069 err = -EPIPE;
1070 goto out;
1071 }
1072
1073 /* Return if the socket is not in connected state */
1074 if (sk->sk_state != IUCV_CONNECTED) {
1075 err = -ENOTCONN;
1076 goto out;
1077 }
1078
1079 /* initialize defaults */
1080 cmsg_done = 0; /* check for duplicate headers */
1081 txmsg.class = 0;
1082
1083 /* iterate over control messages */
1084 for_each_cmsghdr(cmsg, msg) {
1085 if (!CMSG_OK(msg, cmsg)) {
1086 err = -EINVAL;
1087 goto out;
1088 }
1089
1090 if (cmsg->cmsg_level != SOL_IUCV)
1091 continue;
1092
1093 if (cmsg->cmsg_type & cmsg_done) {
1094 err = -EINVAL;
1095 goto out;
1096 }
1097 cmsg_done |= cmsg->cmsg_type;
1098
1099 switch (cmsg->cmsg_type) {
1100 case SCM_IUCV_TRGCLS:
1101 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1102 err = -EINVAL;
1103 goto out;
1104 }
1105
1106 /* set iucv message target class */
1107 memcpy(&txmsg.class,
1108 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1109
1110 break;
1111
1112 default:
1113 err = -EINVAL;
1114 goto out;
1115 }
1116 }
1117
1118 /* allocate one skb for each iucv message:
1119 * this is fine for SOCK_SEQPACKET (unless we want to support
1120 * segmented records using the MSG_EOR flag), but
1121 * for SOCK_STREAM we might want to improve it in future */
1122 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1123 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1124 linear = len;
1125 } else {
1126 if (len < PAGE_SIZE) {
1127 linear = len;
1128 } else {
1129 /* In nonlinear "classic" iucv skb,
1130 * reserve space for iucv_array
1131 */
1132 headroom = sizeof(struct iucv_array) *
1133 (MAX_SKB_FRAGS + 1);
1134 linear = PAGE_SIZE - headroom;
1135 }
1136 }
1137 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1138 noblock, &err, 0);
1139 if (!skb)
1140 goto out;
1141 if (headroom)
1142 skb_reserve(skb, headroom);
1143 skb_put(skb, linear);
1144 skb->len = len;
1145 skb->data_len = len - linear;
1146 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1147 if (err)
1148 goto fail;
1149
1150 /* wait if outstanding messages for iucv path has reached */
1151 timeo = sock_sndtimeo(sk, noblock);
1152 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1153 if (err)
1154 goto fail;
1155
1156 /* return -ECONNRESET if the socket is no longer connected */
1157 if (sk->sk_state != IUCV_CONNECTED) {
1158 err = -ECONNRESET;
1159 goto fail;
1160 }
1161
1162 /* increment and save iucv message tag for msg_completion cbk */
1163 txmsg.tag = iucv->send_tag++;
1164 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1165
1166 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1167 atomic_inc(&iucv->msg_sent);
1168 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1169 if (err) {
1170 atomic_dec(&iucv->msg_sent);
1171 goto fail;
1172 }
1173 } else { /* Classic VM IUCV transport */
1174 skb_queue_tail(&iucv->send_skb_q, skb);
1175
1176 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1177 skb->len <= 7) {
1178 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1179
1180 /* on success: there is no message_complete callback */
1181 /* for an IPRMDATA msg; remove skb from send queue */
1182 if (err == 0) {
1183 skb_unlink(skb, &iucv->send_skb_q);
1184 kfree_skb(skb);
1185 }
1186
1187 /* this error should never happen since the */
1188 /* IUCV_IPRMDATA path flag is set... sever path */
1189 if (err == 0x15) {
1190 pr_iucv->path_sever(iucv->path, NULL);
1191 skb_unlink(skb, &iucv->send_skb_q);
1192 err = -EPIPE;
1193 goto fail;
1194 }
1195 } else if (skb_is_nonlinear(skb)) {
1196 struct iucv_array *iba = (struct iucv_array *)skb->head;
1197 int i;
1198
1199 /* skip iucv_array lying in the headroom */
1200 iba[0].address = (u32)(addr_t)skb->data;
1201 iba[0].length = (u32)skb_headlen(skb);
1202 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1203 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1204
1205 iba[i + 1].address =
1206 (u32)(addr_t)skb_frag_address(frag);
1207 iba[i + 1].length = (u32)skb_frag_size(frag);
1208 }
1209 err = pr_iucv->message_send(iucv->path, &txmsg,
1210 IUCV_IPBUFLST, 0,
1211 (void *)iba, skb->len);
1212 } else { /* non-IPRM Linear skb */
1213 err = pr_iucv->message_send(iucv->path, &txmsg,
1214 0, 0, (void *)skb->data, skb->len);
1215 }
1216 if (err) {
1217 if (err == 3) {
1218 user_id[8] = 0;
1219 memcpy(user_id, iucv->dst_user_id, 8);
1220 appl_id[8] = 0;
1221 memcpy(appl_id, iucv->dst_name, 8);
1222 pr_err(
1223 "Application %s on z/VM guest %s exceeds message limit\n",
1224 appl_id, user_id);
1225 err = -EAGAIN;
1226 } else {
1227 err = -EPIPE;
1228 }
1229 skb_unlink(skb, &iucv->send_skb_q);
1230 goto fail;
1231 }
1232 }
1233
1234 release_sock(sk);
1235 return len;
1236
1237 fail:
1238 kfree_skb(skb);
1239 out:
1240 release_sock(sk);
1241 return err;
1242 }
1243
1244 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1245 {
1246 size_t headroom, linear;
1247 struct sk_buff *skb;
1248 int err;
1249
1250 if (len < PAGE_SIZE) {
1251 headroom = 0;
1252 linear = len;
1253 } else {
1254 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1255 linear = PAGE_SIZE - headroom;
1256 }
1257 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1258 0, &err, GFP_ATOMIC | GFP_DMA);
1259 WARN_ONCE(!skb,
1260 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1261 len, err);
1262 if (skb) {
1263 if (headroom)
1264 skb_reserve(skb, headroom);
1265 skb_put(skb, linear);
1266 skb->len = len;
1267 skb->data_len = len - linear;
1268 }
1269 return skb;
1270 }
1271
1272 /* iucv_process_message() - Receive a single outstanding IUCV message
1273 *
1274 * Locking: must be called with message_q.lock held
1275 */
1276 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1277 struct iucv_path *path,
1278 struct iucv_message *msg)
1279 {
1280 int rc;
1281 unsigned int len;
1282
1283 len = iucv_msg_length(msg);
1284
1285 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1286 /* Note: the first 4 bytes are reserved for msg tag */
1287 IUCV_SKB_CB(skb)->class = msg->class;
1288
1289 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1290 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1291 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1292 skb->data = NULL;
1293 skb->len = 0;
1294 }
1295 } else {
1296 if (skb_is_nonlinear(skb)) {
1297 struct iucv_array *iba = (struct iucv_array *)skb->head;
1298 int i;
1299
1300 iba[0].address = (u32)(addr_t)skb->data;
1301 iba[0].length = (u32)skb_headlen(skb);
1302 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1303 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1304
1305 iba[i + 1].address =
1306 (u32)(addr_t)skb_frag_address(frag);
1307 iba[i + 1].length = (u32)skb_frag_size(frag);
1308 }
1309 rc = pr_iucv->message_receive(path, msg,
1310 IUCV_IPBUFLST,
1311 (void *)iba, len, NULL);
1312 } else {
1313 rc = pr_iucv->message_receive(path, msg,
1314 msg->flags & IUCV_IPRMDATA,
1315 skb->data, len, NULL);
1316 }
1317 if (rc) {
1318 kfree_skb(skb);
1319 return;
1320 }
1321 WARN_ON_ONCE(skb->len != len);
1322 }
1323
1324 IUCV_SKB_CB(skb)->offset = 0;
1325 if (sk_filter(sk, skb)) {
1326 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1327 kfree_skb(skb);
1328 return;
1329 }
1330 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1331 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1332 }
1333
1334 /* iucv_process_message_q() - Process outstanding IUCV messages
1335 *
1336 * Locking: must be called with message_q.lock held
1337 */
1338 static void iucv_process_message_q(struct sock *sk)
1339 {
1340 struct iucv_sock *iucv = iucv_sk(sk);
1341 struct sk_buff *skb;
1342 struct sock_msg_q *p, *n;
1343
1344 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1345 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1346 if (!skb)
1347 break;
1348 iucv_process_message(sk, skb, p->path, &p->msg);
1349 list_del(&p->list);
1350 kfree(p);
1351 if (!skb_queue_empty(&iucv->backlog_skb_q))
1352 break;
1353 }
1354 }
1355
1356 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1357 size_t len, int flags)
1358 {
1359 int noblock = flags & MSG_DONTWAIT;
1360 struct sock *sk = sock->sk;
1361 struct iucv_sock *iucv = iucv_sk(sk);
1362 unsigned int copied, rlen;
1363 struct sk_buff *skb, *rskb, *cskb;
1364 int err = 0;
1365 u32 offset;
1366
1367 if ((sk->sk_state == IUCV_DISCONN) &&
1368 skb_queue_empty(&iucv->backlog_skb_q) &&
1369 skb_queue_empty(&sk->sk_receive_queue) &&
1370 list_empty(&iucv->message_q.list))
1371 return 0;
1372
1373 if (flags & (MSG_OOB))
1374 return -EOPNOTSUPP;
1375
1376 /* receive/dequeue next skb:
1377 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1378 skb = skb_recv_datagram(sk, flags, noblock, &err);
1379 if (!skb) {
1380 if (sk->sk_shutdown & RCV_SHUTDOWN)
1381 return 0;
1382 return err;
1383 }
1384
1385 offset = IUCV_SKB_CB(skb)->offset;
1386 rlen = skb->len - offset; /* real length of skb */
1387 copied = min_t(unsigned int, rlen, len);
1388 if (!rlen)
1389 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1390
1391 cskb = skb;
1392 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1393 if (!(flags & MSG_PEEK))
1394 skb_queue_head(&sk->sk_receive_queue, skb);
1395 return -EFAULT;
1396 }
1397
1398 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1399 if (sk->sk_type == SOCK_SEQPACKET) {
1400 if (copied < rlen)
1401 msg->msg_flags |= MSG_TRUNC;
1402 /* each iucv message contains a complete record */
1403 msg->msg_flags |= MSG_EOR;
1404 }
1405
1406 /* create control message to store iucv msg target class:
1407 * get the trgcls from the control buffer of the skb due to
1408 * fragmentation of original iucv message. */
1409 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1410 sizeof(IUCV_SKB_CB(skb)->class),
1411 (void *)&IUCV_SKB_CB(skb)->class);
1412 if (err) {
1413 if (!(flags & MSG_PEEK))
1414 skb_queue_head(&sk->sk_receive_queue, skb);
1415 return err;
1416 }
1417
1418 /* Mark read part of skb as used */
1419 if (!(flags & MSG_PEEK)) {
1420
1421 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1422 if (sk->sk_type == SOCK_STREAM) {
1423 if (copied < rlen) {
1424 IUCV_SKB_CB(skb)->offset = offset + copied;
1425 skb_queue_head(&sk->sk_receive_queue, skb);
1426 goto done;
1427 }
1428 }
1429
1430 kfree_skb(skb);
1431 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1432 atomic_inc(&iucv->msg_recv);
1433 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1434 WARN_ON(1);
1435 iucv_sock_close(sk);
1436 return -EFAULT;
1437 }
1438 }
1439
1440 /* Queue backlog skbs */
1441 spin_lock_bh(&iucv->message_q.lock);
1442 rskb = skb_dequeue(&iucv->backlog_skb_q);
1443 while (rskb) {
1444 IUCV_SKB_CB(rskb)->offset = 0;
1445 if (__sock_queue_rcv_skb(sk, rskb)) {
1446 /* handle rcv queue full */
1447 skb_queue_head(&iucv->backlog_skb_q,
1448 rskb);
1449 break;
1450 }
1451 rskb = skb_dequeue(&iucv->backlog_skb_q);
1452 }
1453 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1454 if (!list_empty(&iucv->message_q.list))
1455 iucv_process_message_q(sk);
1456 if (atomic_read(&iucv->msg_recv) >=
1457 iucv->msglimit / 2) {
1458 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1459 if (err) {
1460 sk->sk_state = IUCV_DISCONN;
1461 sk->sk_state_change(sk);
1462 }
1463 }
1464 }
1465 spin_unlock_bh(&iucv->message_q.lock);
1466 }
1467
1468 done:
1469 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1470 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1471 copied = rlen;
1472
1473 return copied;
1474 }
1475
1476 static inline __poll_t iucv_accept_poll(struct sock *parent)
1477 {
1478 struct iucv_sock *isk, *n;
1479 struct sock *sk;
1480
1481 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1482 sk = (struct sock *) isk;
1483
1484 if (sk->sk_state == IUCV_CONNECTED)
1485 return EPOLLIN | EPOLLRDNORM;
1486 }
1487
1488 return 0;
1489 }
1490
1491 __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1492 poll_table *wait)
1493 {
1494 struct sock *sk = sock->sk;
1495 __poll_t mask = 0;
1496
1497 sock_poll_wait(file, sk_sleep(sk), wait);
1498
1499 if (sk->sk_state == IUCV_LISTEN)
1500 return iucv_accept_poll(sk);
1501
1502 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1503 mask |= EPOLLERR |
1504 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1505
1506 if (sk->sk_shutdown & RCV_SHUTDOWN)
1507 mask |= EPOLLRDHUP;
1508
1509 if (sk->sk_shutdown == SHUTDOWN_MASK)
1510 mask |= EPOLLHUP;
1511
1512 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1513 (sk->sk_shutdown & RCV_SHUTDOWN))
1514 mask |= EPOLLIN | EPOLLRDNORM;
1515
1516 if (sk->sk_state == IUCV_CLOSED)
1517 mask |= EPOLLHUP;
1518
1519 if (sk->sk_state == IUCV_DISCONN)
1520 mask |= EPOLLIN;
1521
1522 if (sock_writeable(sk) && iucv_below_msglim(sk))
1523 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1524 else
1525 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1526
1527 return mask;
1528 }
1529
1530 static int iucv_sock_shutdown(struct socket *sock, int how)
1531 {
1532 struct sock *sk = sock->sk;
1533 struct iucv_sock *iucv = iucv_sk(sk);
1534 struct iucv_message txmsg;
1535 int err = 0;
1536
1537 how++;
1538
1539 if ((how & ~SHUTDOWN_MASK) || !how)
1540 return -EINVAL;
1541
1542 lock_sock(sk);
1543 switch (sk->sk_state) {
1544 case IUCV_LISTEN:
1545 case IUCV_DISCONN:
1546 case IUCV_CLOSING:
1547 case IUCV_CLOSED:
1548 err = -ENOTCONN;
1549 goto fail;
1550 default:
1551 break;
1552 }
1553
1554 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1555 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1556 txmsg.class = 0;
1557 txmsg.tag = 0;
1558 err = pr_iucv->message_send(iucv->path, &txmsg,
1559 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1560 if (err) {
1561 switch (err) {
1562 case 1:
1563 err = -ENOTCONN;
1564 break;
1565 case 2:
1566 err = -ECONNRESET;
1567 break;
1568 default:
1569 err = -ENOTCONN;
1570 break;
1571 }
1572 }
1573 } else
1574 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1575 }
1576
1577 sk->sk_shutdown |= how;
1578 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1579 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1580 iucv->path) {
1581 err = pr_iucv->path_quiesce(iucv->path, NULL);
1582 if (err)
1583 err = -ENOTCONN;
1584 /* skb_queue_purge(&sk->sk_receive_queue); */
1585 }
1586 skb_queue_purge(&sk->sk_receive_queue);
1587 }
1588
1589 /* Wake up anyone sleeping in poll */
1590 sk->sk_state_change(sk);
1591
1592 fail:
1593 release_sock(sk);
1594 return err;
1595 }
1596
1597 static int iucv_sock_release(struct socket *sock)
1598 {
1599 struct sock *sk = sock->sk;
1600 int err = 0;
1601
1602 if (!sk)
1603 return 0;
1604
1605 iucv_sock_close(sk);
1606
1607 sock_orphan(sk);
1608 iucv_sock_kill(sk);
1609 return err;
1610 }
1611
1612 /* getsockopt and setsockopt */
1613 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1614 char __user *optval, unsigned int optlen)
1615 {
1616 struct sock *sk = sock->sk;
1617 struct iucv_sock *iucv = iucv_sk(sk);
1618 int val;
1619 int rc;
1620
1621 if (level != SOL_IUCV)
1622 return -ENOPROTOOPT;
1623
1624 if (optlen < sizeof(int))
1625 return -EINVAL;
1626
1627 if (get_user(val, (int __user *) optval))
1628 return -EFAULT;
1629
1630 rc = 0;
1631
1632 lock_sock(sk);
1633 switch (optname) {
1634 case SO_IPRMDATA_MSG:
1635 if (val)
1636 iucv->flags |= IUCV_IPRMDATA;
1637 else
1638 iucv->flags &= ~IUCV_IPRMDATA;
1639 break;
1640 case SO_MSGLIMIT:
1641 switch (sk->sk_state) {
1642 case IUCV_OPEN:
1643 case IUCV_BOUND:
1644 if (val < 1 || val > (u16)(~0))
1645 rc = -EINVAL;
1646 else
1647 iucv->msglimit = val;
1648 break;
1649 default:
1650 rc = -EINVAL;
1651 break;
1652 }
1653 break;
1654 default:
1655 rc = -ENOPROTOOPT;
1656 break;
1657 }
1658 release_sock(sk);
1659
1660 return rc;
1661 }
1662
1663 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1664 char __user *optval, int __user *optlen)
1665 {
1666 struct sock *sk = sock->sk;
1667 struct iucv_sock *iucv = iucv_sk(sk);
1668 unsigned int val;
1669 int len;
1670
1671 if (level != SOL_IUCV)
1672 return -ENOPROTOOPT;
1673
1674 if (get_user(len, optlen))
1675 return -EFAULT;
1676
1677 if (len < 0)
1678 return -EINVAL;
1679
1680 len = min_t(unsigned int, len, sizeof(int));
1681
1682 switch (optname) {
1683 case SO_IPRMDATA_MSG:
1684 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1685 break;
1686 case SO_MSGLIMIT:
1687 lock_sock(sk);
1688 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1689 : iucv->msglimit; /* default */
1690 release_sock(sk);
1691 break;
1692 case SO_MSGSIZE:
1693 if (sk->sk_state == IUCV_OPEN)
1694 return -EBADFD;
1695 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1696 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1697 0x7fffffff;
1698 break;
1699 default:
1700 return -ENOPROTOOPT;
1701 }
1702
1703 if (put_user(len, optlen))
1704 return -EFAULT;
1705 if (copy_to_user(optval, &val, len))
1706 return -EFAULT;
1707
1708 return 0;
1709 }
1710
1711
1712 /* Callback wrappers - called from iucv base support */
1713 static int iucv_callback_connreq(struct iucv_path *path,
1714 u8 ipvmid[8], u8 ipuser[16])
1715 {
1716 unsigned char user_data[16];
1717 unsigned char nuser_data[16];
1718 unsigned char src_name[8];
1719 struct sock *sk, *nsk;
1720 struct iucv_sock *iucv, *niucv;
1721 int err;
1722
1723 memcpy(src_name, ipuser, 8);
1724 EBCASC(src_name, 8);
1725 /* Find out if this path belongs to af_iucv. */
1726 read_lock(&iucv_sk_list.lock);
1727 iucv = NULL;
1728 sk = NULL;
1729 sk_for_each(sk, &iucv_sk_list.head)
1730 if (sk->sk_state == IUCV_LISTEN &&
1731 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1732 /*
1733 * Found a listening socket with
1734 * src_name == ipuser[0-7].
1735 */
1736 iucv = iucv_sk(sk);
1737 break;
1738 }
1739 read_unlock(&iucv_sk_list.lock);
1740 if (!iucv)
1741 /* No socket found, not one of our paths. */
1742 return -EINVAL;
1743
1744 bh_lock_sock(sk);
1745
1746 /* Check if parent socket is listening */
1747 low_nmcpy(user_data, iucv->src_name);
1748 high_nmcpy(user_data, iucv->dst_name);
1749 ASCEBC(user_data, sizeof(user_data));
1750 if (sk->sk_state != IUCV_LISTEN) {
1751 err = pr_iucv->path_sever(path, user_data);
1752 iucv_path_free(path);
1753 goto fail;
1754 }
1755
1756 /* Check for backlog size */
1757 if (sk_acceptq_is_full(sk)) {
1758 err = pr_iucv->path_sever(path, user_data);
1759 iucv_path_free(path);
1760 goto fail;
1761 }
1762
1763 /* Create the new socket */
1764 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1765 if (!nsk) {
1766 err = pr_iucv->path_sever(path, user_data);
1767 iucv_path_free(path);
1768 goto fail;
1769 }
1770
1771 niucv = iucv_sk(nsk);
1772 iucv_sock_init(nsk, sk);
1773
1774 /* Set the new iucv_sock */
1775 memcpy(niucv->dst_name, ipuser + 8, 8);
1776 EBCASC(niucv->dst_name, 8);
1777 memcpy(niucv->dst_user_id, ipvmid, 8);
1778 memcpy(niucv->src_name, iucv->src_name, 8);
1779 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1780 niucv->path = path;
1781
1782 /* Call iucv_accept */
1783 high_nmcpy(nuser_data, ipuser + 8);
1784 memcpy(nuser_data + 8, niucv->src_name, 8);
1785 ASCEBC(nuser_data + 8, 8);
1786
1787 /* set message limit for path based on msglimit of accepting socket */
1788 niucv->msglimit = iucv->msglimit;
1789 path->msglim = iucv->msglimit;
1790 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1791 if (err) {
1792 iucv_sever_path(nsk, 1);
1793 iucv_sock_kill(nsk);
1794 goto fail;
1795 }
1796
1797 iucv_accept_enqueue(sk, nsk);
1798
1799 /* Wake up accept */
1800 nsk->sk_state = IUCV_CONNECTED;
1801 sk->sk_data_ready(sk);
1802 err = 0;
1803 fail:
1804 bh_unlock_sock(sk);
1805 return 0;
1806 }
1807
1808 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1809 {
1810 struct sock *sk = path->private;
1811
1812 sk->sk_state = IUCV_CONNECTED;
1813 sk->sk_state_change(sk);
1814 }
1815
1816 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1817 {
1818 struct sock *sk = path->private;
1819 struct iucv_sock *iucv = iucv_sk(sk);
1820 struct sk_buff *skb;
1821 struct sock_msg_q *save_msg;
1822 int len;
1823
1824 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1825 pr_iucv->message_reject(path, msg);
1826 return;
1827 }
1828
1829 spin_lock(&iucv->message_q.lock);
1830
1831 if (!list_empty(&iucv->message_q.list) ||
1832 !skb_queue_empty(&iucv->backlog_skb_q))
1833 goto save_message;
1834
1835 len = atomic_read(&sk->sk_rmem_alloc);
1836 len += SKB_TRUESIZE(iucv_msg_length(msg));
1837 if (len > sk->sk_rcvbuf)
1838 goto save_message;
1839
1840 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1841 if (!skb)
1842 goto save_message;
1843
1844 iucv_process_message(sk, skb, path, msg);
1845 goto out_unlock;
1846
1847 save_message:
1848 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1849 if (!save_msg)
1850 goto out_unlock;
1851 save_msg->path = path;
1852 save_msg->msg = *msg;
1853
1854 list_add_tail(&save_msg->list, &iucv->message_q.list);
1855
1856 out_unlock:
1857 spin_unlock(&iucv->message_q.lock);
1858 }
1859
1860 static void iucv_callback_txdone(struct iucv_path *path,
1861 struct iucv_message *msg)
1862 {
1863 struct sock *sk = path->private;
1864 struct sk_buff *this = NULL;
1865 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1866 struct sk_buff *list_skb = list->next;
1867 unsigned long flags;
1868
1869 bh_lock_sock(sk);
1870 if (!skb_queue_empty(list)) {
1871 spin_lock_irqsave(&list->lock, flags);
1872
1873 while (list_skb != (struct sk_buff *)list) {
1874 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1875 this = list_skb;
1876 break;
1877 }
1878 list_skb = list_skb->next;
1879 }
1880 if (this)
1881 __skb_unlink(this, list);
1882
1883 spin_unlock_irqrestore(&list->lock, flags);
1884
1885 if (this) {
1886 kfree_skb(this);
1887 /* wake up any process waiting for sending */
1888 iucv_sock_wake_msglim(sk);
1889 }
1890 }
1891
1892 if (sk->sk_state == IUCV_CLOSING) {
1893 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1894 sk->sk_state = IUCV_CLOSED;
1895 sk->sk_state_change(sk);
1896 }
1897 }
1898 bh_unlock_sock(sk);
1899
1900 }
1901
1902 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1903 {
1904 struct sock *sk = path->private;
1905
1906 if (sk->sk_state == IUCV_CLOSED)
1907 return;
1908
1909 bh_lock_sock(sk);
1910 iucv_sever_path(sk, 1);
1911 sk->sk_state = IUCV_DISCONN;
1912
1913 sk->sk_state_change(sk);
1914 bh_unlock_sock(sk);
1915 }
1916
1917 /* called if the other communication side shuts down its RECV direction;
1918 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1919 */
1920 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1921 {
1922 struct sock *sk = path->private;
1923
1924 bh_lock_sock(sk);
1925 if (sk->sk_state != IUCV_CLOSED) {
1926 sk->sk_shutdown |= SEND_SHUTDOWN;
1927 sk->sk_state_change(sk);
1928 }
1929 bh_unlock_sock(sk);
1930 }
1931
1932 /***************** HiperSockets transport callbacks ********************/
1933 static void afiucv_swap_src_dest(struct sk_buff *skb)
1934 {
1935 struct af_iucv_trans_hdr *trans_hdr =
1936 (struct af_iucv_trans_hdr *)skb->data;
1937 char tmpID[8];
1938 char tmpName[8];
1939
1940 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1941 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1942 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1943 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1944 memcpy(tmpID, trans_hdr->srcUserID, 8);
1945 memcpy(tmpName, trans_hdr->srcAppName, 8);
1946 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1947 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1948 memcpy(trans_hdr->destUserID, tmpID, 8);
1949 memcpy(trans_hdr->destAppName, tmpName, 8);
1950 skb_push(skb, ETH_HLEN);
1951 memset(skb->data, 0, ETH_HLEN);
1952 }
1953
1954 /**
1955 * afiucv_hs_callback_syn - react on received SYN
1956 **/
1957 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1958 {
1959 struct sock *nsk;
1960 struct iucv_sock *iucv, *niucv;
1961 struct af_iucv_trans_hdr *trans_hdr;
1962 int err;
1963
1964 iucv = iucv_sk(sk);
1965 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1966 if (!iucv) {
1967 /* no sock - connection refused */
1968 afiucv_swap_src_dest(skb);
1969 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1970 err = dev_queue_xmit(skb);
1971 goto out;
1972 }
1973
1974 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1975 bh_lock_sock(sk);
1976 if ((sk->sk_state != IUCV_LISTEN) ||
1977 sk_acceptq_is_full(sk) ||
1978 !nsk) {
1979 /* error on server socket - connection refused */
1980 afiucv_swap_src_dest(skb);
1981 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1982 err = dev_queue_xmit(skb);
1983 iucv_sock_kill(nsk);
1984 bh_unlock_sock(sk);
1985 goto out;
1986 }
1987
1988 niucv = iucv_sk(nsk);
1989 iucv_sock_init(nsk, sk);
1990 niucv->transport = AF_IUCV_TRANS_HIPER;
1991 niucv->msglimit = iucv->msglimit;
1992 if (!trans_hdr->window)
1993 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1994 else
1995 niucv->msglimit_peer = trans_hdr->window;
1996 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1997 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1998 memcpy(niucv->src_name, iucv->src_name, 8);
1999 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2000 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2001 niucv->hs_dev = iucv->hs_dev;
2002 dev_hold(niucv->hs_dev);
2003 afiucv_swap_src_dest(skb);
2004 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2005 trans_hdr->window = niucv->msglimit;
2006 /* if receiver acks the xmit connection is established */
2007 err = dev_queue_xmit(skb);
2008 if (!err) {
2009 iucv_accept_enqueue(sk, nsk);
2010 nsk->sk_state = IUCV_CONNECTED;
2011 sk->sk_data_ready(sk);
2012 } else
2013 iucv_sock_kill(nsk);
2014 bh_unlock_sock(sk);
2015
2016 out:
2017 return NET_RX_SUCCESS;
2018 }
2019
2020 /**
2021 * afiucv_hs_callback_synack() - react on received SYN-ACK
2022 **/
2023 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2024 {
2025 struct iucv_sock *iucv = iucv_sk(sk);
2026 struct af_iucv_trans_hdr *trans_hdr =
2027 (struct af_iucv_trans_hdr *)skb->data;
2028
2029 if (!iucv)
2030 goto out;
2031 if (sk->sk_state != IUCV_BOUND)
2032 goto out;
2033 bh_lock_sock(sk);
2034 iucv->msglimit_peer = trans_hdr->window;
2035 sk->sk_state = IUCV_CONNECTED;
2036 sk->sk_state_change(sk);
2037 bh_unlock_sock(sk);
2038 out:
2039 kfree_skb(skb);
2040 return NET_RX_SUCCESS;
2041 }
2042
2043 /**
2044 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2045 **/
2046 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2047 {
2048 struct iucv_sock *iucv = iucv_sk(sk);
2049
2050 if (!iucv)
2051 goto out;
2052 if (sk->sk_state != IUCV_BOUND)
2053 goto out;
2054 bh_lock_sock(sk);
2055 sk->sk_state = IUCV_DISCONN;
2056 sk->sk_state_change(sk);
2057 bh_unlock_sock(sk);
2058 out:
2059 kfree_skb(skb);
2060 return NET_RX_SUCCESS;
2061 }
2062
2063 /**
2064 * afiucv_hs_callback_fin() - react on received FIN
2065 **/
2066 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2067 {
2068 struct iucv_sock *iucv = iucv_sk(sk);
2069
2070 /* other end of connection closed */
2071 if (!iucv)
2072 goto out;
2073 bh_lock_sock(sk);
2074 if (sk->sk_state == IUCV_CONNECTED) {
2075 sk->sk_state = IUCV_DISCONN;
2076 sk->sk_state_change(sk);
2077 }
2078 bh_unlock_sock(sk);
2079 out:
2080 kfree_skb(skb);
2081 return NET_RX_SUCCESS;
2082 }
2083
2084 /**
2085 * afiucv_hs_callback_win() - react on received WIN
2086 **/
2087 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2088 {
2089 struct iucv_sock *iucv = iucv_sk(sk);
2090 struct af_iucv_trans_hdr *trans_hdr =
2091 (struct af_iucv_trans_hdr *)skb->data;
2092
2093 if (!iucv)
2094 return NET_RX_SUCCESS;
2095
2096 if (sk->sk_state != IUCV_CONNECTED)
2097 return NET_RX_SUCCESS;
2098
2099 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2100 iucv_sock_wake_msglim(sk);
2101 return NET_RX_SUCCESS;
2102 }
2103
2104 /**
2105 * afiucv_hs_callback_rx() - react on received data
2106 **/
2107 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2108 {
2109 struct iucv_sock *iucv = iucv_sk(sk);
2110
2111 if (!iucv) {
2112 kfree_skb(skb);
2113 return NET_RX_SUCCESS;
2114 }
2115
2116 if (sk->sk_state != IUCV_CONNECTED) {
2117 kfree_skb(skb);
2118 return NET_RX_SUCCESS;
2119 }
2120
2121 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2122 kfree_skb(skb);
2123 return NET_RX_SUCCESS;
2124 }
2125
2126 /* write stuff from iucv_msg to skb cb */
2127 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2128 skb_reset_transport_header(skb);
2129 skb_reset_network_header(skb);
2130 IUCV_SKB_CB(skb)->offset = 0;
2131 if (sk_filter(sk, skb)) {
2132 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2133 kfree_skb(skb);
2134 return NET_RX_SUCCESS;
2135 }
2136
2137 spin_lock(&iucv->message_q.lock);
2138 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2139 if (__sock_queue_rcv_skb(sk, skb))
2140 /* handle rcv queue full */
2141 skb_queue_tail(&iucv->backlog_skb_q, skb);
2142 } else
2143 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2144 spin_unlock(&iucv->message_q.lock);
2145 return NET_RX_SUCCESS;
2146 }
2147
2148 /**
2149 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2150 * transport
2151 * called from netif RX softirq
2152 **/
2153 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2154 struct packet_type *pt, struct net_device *orig_dev)
2155 {
2156 struct sock *sk;
2157 struct iucv_sock *iucv;
2158 struct af_iucv_trans_hdr *trans_hdr;
2159 char nullstring[8];
2160 int err = 0;
2161
2162 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2163 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2164 (int)skb->len,
2165 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2166 kfree_skb(skb);
2167 return NET_RX_SUCCESS;
2168 }
2169 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2170 if (skb_linearize(skb)) {
2171 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2172 (int)skb->len);
2173 kfree_skb(skb);
2174 return NET_RX_SUCCESS;
2175 }
2176 skb_pull(skb, ETH_HLEN);
2177 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2178 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2179 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2180 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2181 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2182 memset(nullstring, 0, sizeof(nullstring));
2183 iucv = NULL;
2184 sk = NULL;
2185 read_lock(&iucv_sk_list.lock);
2186 sk_for_each(sk, &iucv_sk_list.head) {
2187 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2188 if ((!memcmp(&iucv_sk(sk)->src_name,
2189 trans_hdr->destAppName, 8)) &&
2190 (!memcmp(&iucv_sk(sk)->src_user_id,
2191 trans_hdr->destUserID, 8)) &&
2192 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2193 (!memcmp(&iucv_sk(sk)->dst_user_id,
2194 nullstring, 8))) {
2195 iucv = iucv_sk(sk);
2196 break;
2197 }
2198 } else {
2199 if ((!memcmp(&iucv_sk(sk)->src_name,
2200 trans_hdr->destAppName, 8)) &&
2201 (!memcmp(&iucv_sk(sk)->src_user_id,
2202 trans_hdr->destUserID, 8)) &&
2203 (!memcmp(&iucv_sk(sk)->dst_name,
2204 trans_hdr->srcAppName, 8)) &&
2205 (!memcmp(&iucv_sk(sk)->dst_user_id,
2206 trans_hdr->srcUserID, 8))) {
2207 iucv = iucv_sk(sk);
2208 break;
2209 }
2210 }
2211 }
2212 read_unlock(&iucv_sk_list.lock);
2213 if (!iucv)
2214 sk = NULL;
2215
2216 /* no sock
2217 how should we send with no sock
2218 1) send without sock no send rc checking?
2219 2) introduce default sock to handle this cases
2220
2221 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2222 data -> send FIN
2223 SYN|ACK, SYN|FIN, FIN -> no action? */
2224
2225 switch (trans_hdr->flags) {
2226 case AF_IUCV_FLAG_SYN:
2227 /* connect request */
2228 err = afiucv_hs_callback_syn(sk, skb);
2229 break;
2230 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2231 /* connect request confirmed */
2232 err = afiucv_hs_callback_synack(sk, skb);
2233 break;
2234 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2235 /* connect request refused */
2236 err = afiucv_hs_callback_synfin(sk, skb);
2237 break;
2238 case (AF_IUCV_FLAG_FIN):
2239 /* close request */
2240 err = afiucv_hs_callback_fin(sk, skb);
2241 break;
2242 case (AF_IUCV_FLAG_WIN):
2243 err = afiucv_hs_callback_win(sk, skb);
2244 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2245 kfree_skb(skb);
2246 break;
2247 }
2248 /* fall through and receive non-zero length data */
2249 case (AF_IUCV_FLAG_SHT):
2250 /* shutdown request */
2251 /* fall through and receive zero length data */
2252 case 0:
2253 /* plain data frame */
2254 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2255 err = afiucv_hs_callback_rx(sk, skb);
2256 break;
2257 default:
2258 ;
2259 }
2260
2261 return err;
2262 }
2263
2264 /**
2265 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2266 * transport
2267 **/
2268 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2269 enum iucv_tx_notify n)
2270 {
2271 struct sock *isk = skb->sk;
2272 struct sock *sk = NULL;
2273 struct iucv_sock *iucv = NULL;
2274 struct sk_buff_head *list;
2275 struct sk_buff *list_skb;
2276 struct sk_buff *nskb;
2277 unsigned long flags;
2278
2279 read_lock_irqsave(&iucv_sk_list.lock, flags);
2280 sk_for_each(sk, &iucv_sk_list.head)
2281 if (sk == isk) {
2282 iucv = iucv_sk(sk);
2283 break;
2284 }
2285 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2286
2287 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2288 return;
2289
2290 list = &iucv->send_skb_q;
2291 spin_lock_irqsave(&list->lock, flags);
2292 if (skb_queue_empty(list))
2293 goto out_unlock;
2294 list_skb = list->next;
2295 nskb = list_skb->next;
2296 while (list_skb != (struct sk_buff *)list) {
2297 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2298 switch (n) {
2299 case TX_NOTIFY_OK:
2300 __skb_unlink(list_skb, list);
2301 kfree_skb(list_skb);
2302 iucv_sock_wake_msglim(sk);
2303 break;
2304 case TX_NOTIFY_PENDING:
2305 atomic_inc(&iucv->pendings);
2306 break;
2307 case TX_NOTIFY_DELAYED_OK:
2308 __skb_unlink(list_skb, list);
2309 atomic_dec(&iucv->pendings);
2310 if (atomic_read(&iucv->pendings) <= 0)
2311 iucv_sock_wake_msglim(sk);
2312 kfree_skb(list_skb);
2313 break;
2314 case TX_NOTIFY_UNREACHABLE:
2315 case TX_NOTIFY_DELAYED_UNREACHABLE:
2316 case TX_NOTIFY_TPQFULL: /* not yet used */
2317 case TX_NOTIFY_GENERALERROR:
2318 case TX_NOTIFY_DELAYED_GENERALERROR:
2319 __skb_unlink(list_skb, list);
2320 kfree_skb(list_skb);
2321 if (sk->sk_state == IUCV_CONNECTED) {
2322 sk->sk_state = IUCV_DISCONN;
2323 sk->sk_state_change(sk);
2324 }
2325 break;
2326 }
2327 break;
2328 }
2329 list_skb = nskb;
2330 nskb = nskb->next;
2331 }
2332 out_unlock:
2333 spin_unlock_irqrestore(&list->lock, flags);
2334
2335 if (sk->sk_state == IUCV_CLOSING) {
2336 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2337 sk->sk_state = IUCV_CLOSED;
2338 sk->sk_state_change(sk);
2339 }
2340 }
2341
2342 }
2343
2344 /*
2345 * afiucv_netdev_event: handle netdev notifier chain events
2346 */
2347 static int afiucv_netdev_event(struct notifier_block *this,
2348 unsigned long event, void *ptr)
2349 {
2350 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2351 struct sock *sk;
2352 struct iucv_sock *iucv;
2353
2354 switch (event) {
2355 case NETDEV_REBOOT:
2356 case NETDEV_GOING_DOWN:
2357 sk_for_each(sk, &iucv_sk_list.head) {
2358 iucv = iucv_sk(sk);
2359 if ((iucv->hs_dev == event_dev) &&
2360 (sk->sk_state == IUCV_CONNECTED)) {
2361 if (event == NETDEV_GOING_DOWN)
2362 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2363 sk->sk_state = IUCV_DISCONN;
2364 sk->sk_state_change(sk);
2365 }
2366 }
2367 break;
2368 case NETDEV_DOWN:
2369 case NETDEV_UNREGISTER:
2370 default:
2371 break;
2372 }
2373 return NOTIFY_DONE;
2374 }
2375
2376 static struct notifier_block afiucv_netdev_notifier = {
2377 .notifier_call = afiucv_netdev_event,
2378 };
2379
2380 static const struct proto_ops iucv_sock_ops = {
2381 .family = PF_IUCV,
2382 .owner = THIS_MODULE,
2383 .release = iucv_sock_release,
2384 .bind = iucv_sock_bind,
2385 .connect = iucv_sock_connect,
2386 .listen = iucv_sock_listen,
2387 .accept = iucv_sock_accept,
2388 .getname = iucv_sock_getname,
2389 .sendmsg = iucv_sock_sendmsg,
2390 .recvmsg = iucv_sock_recvmsg,
2391 .poll = iucv_sock_poll,
2392 .ioctl = sock_no_ioctl,
2393 .mmap = sock_no_mmap,
2394 .socketpair = sock_no_socketpair,
2395 .shutdown = iucv_sock_shutdown,
2396 .setsockopt = iucv_sock_setsockopt,
2397 .getsockopt = iucv_sock_getsockopt,
2398 };
2399
2400 static const struct net_proto_family iucv_sock_family_ops = {
2401 .family = AF_IUCV,
2402 .owner = THIS_MODULE,
2403 .create = iucv_sock_create,
2404 };
2405
2406 static struct packet_type iucv_packet_type = {
2407 .type = cpu_to_be16(ETH_P_AF_IUCV),
2408 .func = afiucv_hs_rcv,
2409 };
2410
2411 static int afiucv_iucv_init(void)
2412 {
2413 int err;
2414
2415 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2416 if (err)
2417 goto out;
2418 /* establish dummy device */
2419 af_iucv_driver.bus = pr_iucv->bus;
2420 err = driver_register(&af_iucv_driver);
2421 if (err)
2422 goto out_iucv;
2423 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2424 if (!af_iucv_dev) {
2425 err = -ENOMEM;
2426 goto out_driver;
2427 }
2428 dev_set_name(af_iucv_dev, "af_iucv");
2429 af_iucv_dev->bus = pr_iucv->bus;
2430 af_iucv_dev->parent = pr_iucv->root;
2431 af_iucv_dev->release = (void (*)(struct device *))kfree;
2432 af_iucv_dev->driver = &af_iucv_driver;
2433 err = device_register(af_iucv_dev);
2434 if (err)
2435 goto out_iucv_dev;
2436 return 0;
2437
2438 out_iucv_dev:
2439 put_device(af_iucv_dev);
2440 out_driver:
2441 driver_unregister(&af_iucv_driver);
2442 out_iucv:
2443 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2444 out:
2445 return err;
2446 }
2447
2448 static int __init afiucv_init(void)
2449 {
2450 int err;
2451
2452 if (MACHINE_IS_VM) {
2453 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2454 if (unlikely(err)) {
2455 WARN_ON(err);
2456 err = -EPROTONOSUPPORT;
2457 goto out;
2458 }
2459
2460 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2461 if (!pr_iucv) {
2462 printk(KERN_WARNING "iucv_if lookup failed\n");
2463 memset(&iucv_userid, 0, sizeof(iucv_userid));
2464 }
2465 } else {
2466 memset(&iucv_userid, 0, sizeof(iucv_userid));
2467 pr_iucv = NULL;
2468 }
2469
2470 err = proto_register(&iucv_proto, 0);
2471 if (err)
2472 goto out;
2473 err = sock_register(&iucv_sock_family_ops);
2474 if (err)
2475 goto out_proto;
2476
2477 if (pr_iucv) {
2478 err = afiucv_iucv_init();
2479 if (err)
2480 goto out_sock;
2481 } else
2482 register_netdevice_notifier(&afiucv_netdev_notifier);
2483 dev_add_pack(&iucv_packet_type);
2484 return 0;
2485
2486 out_sock:
2487 sock_unregister(PF_IUCV);
2488 out_proto:
2489 proto_unregister(&iucv_proto);
2490 out:
2491 if (pr_iucv)
2492 symbol_put(iucv_if);
2493 return err;
2494 }
2495
2496 static void __exit afiucv_exit(void)
2497 {
2498 if (pr_iucv) {
2499 device_unregister(af_iucv_dev);
2500 driver_unregister(&af_iucv_driver);
2501 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2502 symbol_put(iucv_if);
2503 } else
2504 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2505 dev_remove_pack(&iucv_packet_type);
2506 sock_unregister(PF_IUCV);
2507 proto_unregister(&iucv_proto);
2508 }
2509
2510 module_init(afiucv_init);
2511 module_exit(afiucv_exit);
2512
2513 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2514 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2515 MODULE_VERSION(VERSION);
2516 MODULE_LICENSE("GPL");
2517 MODULE_ALIAS_NETPROTO(PF_IUCV);
2518
Linux with added FPC-III support