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pktgen: add needed include file
[linux/fpc-iii.git] / net / iucv / af_iucv.c
blob168aff5e60de528194a1f4b8ea836cf394ea6613
1 /*
2 * IUCV protocol stack for Linux on zSeries
3 *
4 * Copyright IBM Corp. 2006, 2009
5 *
6 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
7 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
8 * PM functions:
9 * Ursula Braun <ursula.braun@de.ibm.com>
10 */
11
12 #define KMSG_COMPONENT "af_iucv"
13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/list.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/skbuff.h>
23 #include <linux/init.h>
24 #include <linux/poll.h>
25 #include <net/sock.h>
26 #include <asm/ebcdic.h>
27 #include <asm/cpcmd.h>
28 #include <linux/kmod.h>
29
30 #include <net/iucv/af_iucv.h>
31
32 #define VERSION "1.2"
33
34 static char iucv_userid[80];
35
36 static const struct proto_ops iucv_sock_ops;
37
38 static struct proto iucv_proto = {
39 .name = "AF_IUCV",
40 .owner = THIS_MODULE,
41 .obj_size = sizeof(struct iucv_sock),
42 };
43
44 static struct iucv_interface *pr_iucv;
45
46 /* special AF_IUCV IPRM messages */
47 static const u8 iprm_shutdown[8] =
48 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
49
50 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
51
52 #define __iucv_sock_wait(sk, condition, timeo, ret) \
53 do { \
54 DEFINE_WAIT(__wait); \
55 long __timeo = timeo; \
56 ret = 0; \
57 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
58 while (!(condition)) { \
59 if (!__timeo) { \
60 ret = -EAGAIN; \
61 break; \
62 } \
63 if (signal_pending(current)) { \
64 ret = sock_intr_errno(__timeo); \
65 break; \
66 } \
67 release_sock(sk); \
68 __timeo = schedule_timeout(__timeo); \
69 lock_sock(sk); \
70 ret = sock_error(sk); \
71 if (ret) \
72 break; \
73 } \
74 finish_wait(sk_sleep(sk), &__wait); \
75 } while (0)
76
77 #define iucv_sock_wait(sk, condition, timeo) \
78 ({ \
79 int __ret = 0; \
80 if (!(condition)) \
81 __iucv_sock_wait(sk, condition, timeo, __ret); \
82 __ret; \
83 })
84
85 static void iucv_sock_kill(struct sock *sk);
86 static void iucv_sock_close(struct sock *sk);
87 static void iucv_sever_path(struct sock *, int);
88
89 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
90 struct packet_type *pt, struct net_device *orig_dev);
91 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
92 struct sk_buff *skb, u8 flags);
93 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
94
95 /* Call Back functions */
96 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
97 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
99 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
100 u8 ipuser[16]);
101 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
103
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
107 };
108
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
116 };
117
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120 memcpy(dst, src, 8);
121 }
122
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(&dst[8], src, 8);
126 }
127
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133 return 0;
134 }
135
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142
143 /**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151 struct iucv_sock *iucv;
152 struct sock *sk;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 switch (sk->sk_state) {
162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
165 iucv_sever_path(sk, 0);
166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179 }
180
181 /**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189 struct sock *sk;
190
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213 }
214
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221 };
222
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
226 .bus = NULL,
227 .pm = &afiucv_pm_ops,
228 };
229
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232
233 /**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
245 * The socket data length is computed by subtracting the socket data length
246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262 }
263
264 /**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274 return (sk->sk_state == state || sk->sk_state == state2);
275 }
276
277 /**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
296 }
297
298 /**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
307 if (wq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310 rcu_read_unlock();
311 }
312
313 /**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318 {
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
341 if (confirm_recv)
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 }
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 if (imsg)
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354
355 skb->dev = iucv->hs_dev;
356 if (!skb->dev)
357 return -ENODEV;
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
359 return -ENETDOWN;
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
362 return -EMSGSIZE;
363 else
364 skb_trim(skb, skb->dev->mtu);
365 }
366 skb->protocol = ETH_P_AF_IUCV;
367 nskb = skb_clone(skb, GFP_ATOMIC);
368 if (!nskb)
369 return -ENOMEM;
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
372 if (net_xmit_eval(err)) {
373 skb_unlink(nskb, &iucv->send_skb_q);
374 kfree_skb(nskb);
375 } else {
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 }
379 return net_xmit_eval(err);
380 }
381
382 static struct sock *__iucv_get_sock_by_name(char *nm)
383 {
384 struct sock *sk;
385
386 sk_for_each(sk, &iucv_sk_list.head)
387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
388 return sk;
389
390 return NULL;
391 }
392
393 static void iucv_sock_destruct(struct sock *sk)
394 {
395 skb_queue_purge(&sk->sk_receive_queue);
396 skb_queue_purge(&sk->sk_error_queue);
397
398 sk_mem_reclaim(sk);
399
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
402 return;
403 }
404
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
409 }
410
411 /* Cleanup Listen */
412 static void iucv_sock_cleanup_listen(struct sock *parent)
413 {
414 struct sock *sk;
415
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
418 iucv_sock_close(sk);
419 iucv_sock_kill(sk);
420 }
421
422 parent->sk_state = IUCV_CLOSED;
423 }
424
425 /* Kill socket (only if zapped and orphaned) */
426 static void iucv_sock_kill(struct sock *sk)
427 {
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
429 return;
430
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
433 sock_put(sk);
434 }
435
436 /* Terminate an IUCV path */
437 static void iucv_sever_path(struct sock *sk, int with_user_data)
438 {
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
442
443 if (iucv->path) {
444 iucv->path = NULL;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
450 } else
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
453 }
454 }
455
456 /* Send FIN through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
458 {
459 int err = 0;
460 int blen;
461 struct sk_buff *skb;
462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 skb = sock_alloc_send_skb(sk, blen, 1, &err);
465 if (skb) {
466 skb_reserve(skb, blen);
467 err = afiucv_hs_send(NULL, sk, skb, flags);
468 }
469 return err;
470 }
471
472 /* Close an IUCV socket */
473 static void iucv_sock_close(struct sock *sk)
474 {
475 struct iucv_sock *iucv = iucv_sk(sk);
476 unsigned long timeo;
477 int err = 0;
478
479 lock_sock(sk);
480
481 switch (sk->sk_state) {
482 case IUCV_LISTEN:
483 iucv_sock_cleanup_listen(sk);
484 break;
485
486 case IUCV_CONNECTED:
487 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
489 sk->sk_state = IUCV_DISCONN;
490 sk->sk_state_change(sk);
491 }
492 case IUCV_DISCONN: /* fall through */
493 sk->sk_state = IUCV_CLOSING;
494 sk->sk_state_change(sk);
495
496 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
498 timeo = sk->sk_lingertime;
499 else
500 timeo = IUCV_DISCONN_TIMEOUT;
501 iucv_sock_wait(sk,
502 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
503 timeo);
504 }
505
506 case IUCV_CLOSING: /* fall through */
507 sk->sk_state = IUCV_CLOSED;
508 sk->sk_state_change(sk);
509
510 sk->sk_err = ECONNRESET;
511 sk->sk_state_change(sk);
512
513 skb_queue_purge(&iucv->send_skb_q);
514 skb_queue_purge(&iucv->backlog_skb_q);
515
516 default: /* fall through */
517 iucv_sever_path(sk, 1);
518 }
519
520 if (iucv->hs_dev) {
521 dev_put(iucv->hs_dev);
522 iucv->hs_dev = NULL;
523 sk->sk_bound_dev_if = 0;
524 }
525
526 /* mark socket for deletion by iucv_sock_kill() */
527 sock_set_flag(sk, SOCK_ZAPPED);
528
529 release_sock(sk);
530 }
531
532 static void iucv_sock_init(struct sock *sk, struct sock *parent)
533 {
534 if (parent)
535 sk->sk_type = parent->sk_type;
536 }
537
538 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
539 {
540 struct sock *sk;
541 struct iucv_sock *iucv;
542
543 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
544 if (!sk)
545 return NULL;
546 iucv = iucv_sk(sk);
547
548 sock_init_data(sock, sk);
549 INIT_LIST_HEAD(&iucv->accept_q);
550 spin_lock_init(&iucv->accept_q_lock);
551 skb_queue_head_init(&iucv->send_skb_q);
552 INIT_LIST_HEAD(&iucv->message_q.list);
553 spin_lock_init(&iucv->message_q.lock);
554 skb_queue_head_init(&iucv->backlog_skb_q);
555 iucv->send_tag = 0;
556 atomic_set(&iucv->pendings, 0);
557 iucv->flags = 0;
558 iucv->msglimit = 0;
559 atomic_set(&iucv->msg_sent, 0);
560 atomic_set(&iucv->msg_recv, 0);
561 iucv->path = NULL;
562 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
563 memset(&iucv->src_user_id , 0, 32);
564 if (pr_iucv)
565 iucv->transport = AF_IUCV_TRANS_IUCV;
566 else
567 iucv->transport = AF_IUCV_TRANS_HIPER;
568
569 sk->sk_destruct = iucv_sock_destruct;
570 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
571 sk->sk_allocation = GFP_DMA;
572
573 sock_reset_flag(sk, SOCK_ZAPPED);
574
575 sk->sk_protocol = proto;
576 sk->sk_state = IUCV_OPEN;
577
578 iucv_sock_link(&iucv_sk_list, sk);
579 return sk;
580 }
581
582 /* Create an IUCV socket */
583 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
584 int kern)
585 {
586 struct sock *sk;
587
588 if (protocol && protocol != PF_IUCV)
589 return -EPROTONOSUPPORT;
590
591 sock->state = SS_UNCONNECTED;
592
593 switch (sock->type) {
594 case SOCK_STREAM:
595 sock->ops = &iucv_sock_ops;
596 break;
597 case SOCK_SEQPACKET:
598 /* currently, proto ops can handle both sk types */
599 sock->ops = &iucv_sock_ops;
600 break;
601 default:
602 return -ESOCKTNOSUPPORT;
603 }
604
605 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
606 if (!sk)
607 return -ENOMEM;
608
609 iucv_sock_init(sk, NULL);
610
611 return 0;
612 }
613
614 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
615 {
616 write_lock_bh(&l->lock);
617 sk_add_node(sk, &l->head);
618 write_unlock_bh(&l->lock);
619 }
620
621 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
622 {
623 write_lock_bh(&l->lock);
624 sk_del_node_init(sk);
625 write_unlock_bh(&l->lock);
626 }
627
628 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
629 {
630 unsigned long flags;
631 struct iucv_sock *par = iucv_sk(parent);
632
633 sock_hold(sk);
634 spin_lock_irqsave(&par->accept_q_lock, flags);
635 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
636 spin_unlock_irqrestore(&par->accept_q_lock, flags);
637 iucv_sk(sk)->parent = parent;
638 sk_acceptq_added(parent);
639 }
640
641 void iucv_accept_unlink(struct sock *sk)
642 {
643 unsigned long flags;
644 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
645
646 spin_lock_irqsave(&par->accept_q_lock, flags);
647 list_del_init(&iucv_sk(sk)->accept_q);
648 spin_unlock_irqrestore(&par->accept_q_lock, flags);
649 sk_acceptq_removed(iucv_sk(sk)->parent);
650 iucv_sk(sk)->parent = NULL;
651 sock_put(sk);
652 }
653
654 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
655 {
656 struct iucv_sock *isk, *n;
657 struct sock *sk;
658
659 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
660 sk = (struct sock *) isk;
661 lock_sock(sk);
662
663 if (sk->sk_state == IUCV_CLOSED) {
664 iucv_accept_unlink(sk);
665 release_sock(sk);
666 continue;
667 }
668
669 if (sk->sk_state == IUCV_CONNECTED ||
670 sk->sk_state == IUCV_DISCONN ||
671 !newsock) {
672 iucv_accept_unlink(sk);
673 if (newsock)
674 sock_graft(sk, newsock);
675
676 release_sock(sk);
677 return sk;
678 }
679
680 release_sock(sk);
681 }
682 return NULL;
683 }
684
685 /* Bind an unbound socket */
686 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
687 int addr_len)
688 {
689 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
690 struct sock *sk = sock->sk;
691 struct iucv_sock *iucv;
692 int err = 0;
693 struct net_device *dev;
694 char uid[9];
695
696 /* Verify the input sockaddr */
697 if (!addr || addr->sa_family != AF_IUCV)
698 return -EINVAL;
699
700 lock_sock(sk);
701 if (sk->sk_state != IUCV_OPEN) {
702 err = -EBADFD;
703 goto done;
704 }
705
706 write_lock_bh(&iucv_sk_list.lock);
707
708 iucv = iucv_sk(sk);
709 if (__iucv_get_sock_by_name(sa->siucv_name)) {
710 err = -EADDRINUSE;
711 goto done_unlock;
712 }
713 if (iucv->path)
714 goto done_unlock;
715
716 /* Bind the socket */
717 if (pr_iucv)
718 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
719 goto vm_bind; /* VM IUCV transport */
720
721 /* try hiper transport */
722 memcpy(uid, sa->siucv_user_id, sizeof(uid));
723 ASCEBC(uid, 8);
724 rcu_read_lock();
725 for_each_netdev_rcu(&init_net, dev) {
726 if (!memcmp(dev->perm_addr, uid, 8)) {
727 memcpy(iucv->src_name, sa->siucv_name, 8);
728 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
729 sk->sk_bound_dev_if = dev->ifindex;
730 iucv->hs_dev = dev;
731 dev_hold(dev);
732 sk->sk_state = IUCV_BOUND;
733 iucv->transport = AF_IUCV_TRANS_HIPER;
734 if (!iucv->msglimit)
735 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
736 rcu_read_unlock();
737 goto done_unlock;
738 }
739 }
740 rcu_read_unlock();
741 vm_bind:
742 if (pr_iucv) {
743 /* use local userid for backward compat */
744 memcpy(iucv->src_name, sa->siucv_name, 8);
745 memcpy(iucv->src_user_id, iucv_userid, 8);
746 sk->sk_state = IUCV_BOUND;
747 iucv->transport = AF_IUCV_TRANS_IUCV;
748 if (!iucv->msglimit)
749 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
750 goto done_unlock;
751 }
752 /* found no dev to bind */
753 err = -ENODEV;
754 done_unlock:
755 /* Release the socket list lock */
756 write_unlock_bh(&iucv_sk_list.lock);
757 done:
758 release_sock(sk);
759 return err;
760 }
761
762 /* Automatically bind an unbound socket */
763 static int iucv_sock_autobind(struct sock *sk)
764 {
765 struct iucv_sock *iucv = iucv_sk(sk);
766 char name[12];
767 int err = 0;
768
769 if (unlikely(!pr_iucv))
770 return -EPROTO;
771
772 memcpy(iucv->src_user_id, iucv_userid, 8);
773
774 write_lock_bh(&iucv_sk_list.lock);
775
776 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
777 while (__iucv_get_sock_by_name(name)) {
778 sprintf(name, "%08x",
779 atomic_inc_return(&iucv_sk_list.autobind_name));
780 }
781
782 write_unlock_bh(&iucv_sk_list.lock);
783
784 memcpy(&iucv->src_name, name, 8);
785
786 if (!iucv->msglimit)
787 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
788
789 return err;
790 }
791
792 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
793 {
794 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
795 struct sock *sk = sock->sk;
796 struct iucv_sock *iucv = iucv_sk(sk);
797 unsigned char user_data[16];
798 int err;
799
800 high_nmcpy(user_data, sa->siucv_name);
801 low_nmcpy(user_data, iucv->src_name);
802 ASCEBC(user_data, sizeof(user_data));
803
804 /* Create path. */
805 iucv->path = iucv_path_alloc(iucv->msglimit,
806 IUCV_IPRMDATA, GFP_KERNEL);
807 if (!iucv->path) {
808 err = -ENOMEM;
809 goto done;
810 }
811 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
812 sa->siucv_user_id, NULL, user_data,
813 sk);
814 if (err) {
815 iucv_path_free(iucv->path);
816 iucv->path = NULL;
817 switch (err) {
818 case 0x0b: /* Target communicator is not logged on */
819 err = -ENETUNREACH;
820 break;
821 case 0x0d: /* Max connections for this guest exceeded */
822 case 0x0e: /* Max connections for target guest exceeded */
823 err = -EAGAIN;
824 break;
825 case 0x0f: /* Missing IUCV authorization */
826 err = -EACCES;
827 break;
828 default:
829 err = -ECONNREFUSED;
830 break;
831 }
832 }
833 done:
834 return err;
835 }
836
837 /* Connect an unconnected socket */
838 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
839 int alen, int flags)
840 {
841 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
842 struct sock *sk = sock->sk;
843 struct iucv_sock *iucv = iucv_sk(sk);
844 int err;
845
846 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
847 return -EINVAL;
848
849 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
850 return -EBADFD;
851
852 if (sk->sk_state == IUCV_OPEN &&
853 iucv->transport == AF_IUCV_TRANS_HIPER)
854 return -EBADFD; /* explicit bind required */
855
856 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
857 return -EINVAL;
858
859 if (sk->sk_state == IUCV_OPEN) {
860 err = iucv_sock_autobind(sk);
861 if (unlikely(err))
862 return err;
863 }
864
865 lock_sock(sk);
866
867 /* Set the destination information */
868 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
869 memcpy(iucv->dst_name, sa->siucv_name, 8);
870
871 if (iucv->transport == AF_IUCV_TRANS_HIPER)
872 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
873 else
874 err = afiucv_path_connect(sock, addr);
875 if (err)
876 goto done;
877
878 if (sk->sk_state != IUCV_CONNECTED)
879 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
880 IUCV_DISCONN),
881 sock_sndtimeo(sk, flags & O_NONBLOCK));
882
883 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
884 err = -ECONNREFUSED;
885
886 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
887 iucv_sever_path(sk, 0);
888
889 done:
890 release_sock(sk);
891 return err;
892 }
893
894 /* Move a socket into listening state. */
895 static int iucv_sock_listen(struct socket *sock, int backlog)
896 {
897 struct sock *sk = sock->sk;
898 int err;
899
900 lock_sock(sk);
901
902 err = -EINVAL;
903 if (sk->sk_state != IUCV_BOUND)
904 goto done;
905
906 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
907 goto done;
908
909 sk->sk_max_ack_backlog = backlog;
910 sk->sk_ack_backlog = 0;
911 sk->sk_state = IUCV_LISTEN;
912 err = 0;
913
914 done:
915 release_sock(sk);
916 return err;
917 }
918
919 /* Accept a pending connection */
920 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
921 int flags)
922 {
923 DECLARE_WAITQUEUE(wait, current);
924 struct sock *sk = sock->sk, *nsk;
925 long timeo;
926 int err = 0;
927
928 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
929
930 if (sk->sk_state != IUCV_LISTEN) {
931 err = -EBADFD;
932 goto done;
933 }
934
935 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
936
937 /* Wait for an incoming connection */
938 add_wait_queue_exclusive(sk_sleep(sk), &wait);
939 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
940 set_current_state(TASK_INTERRUPTIBLE);
941 if (!timeo) {
942 err = -EAGAIN;
943 break;
944 }
945
946 release_sock(sk);
947 timeo = schedule_timeout(timeo);
948 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
949
950 if (sk->sk_state != IUCV_LISTEN) {
951 err = -EBADFD;
952 break;
953 }
954
955 if (signal_pending(current)) {
956 err = sock_intr_errno(timeo);
957 break;
958 }
959 }
960
961 set_current_state(TASK_RUNNING);
962 remove_wait_queue(sk_sleep(sk), &wait);
963
964 if (err)
965 goto done;
966
967 newsock->state = SS_CONNECTED;
968
969 done:
970 release_sock(sk);
971 return err;
972 }
973
974 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
975 int *len, int peer)
976 {
977 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
978 struct sock *sk = sock->sk;
979 struct iucv_sock *iucv = iucv_sk(sk);
980
981 addr->sa_family = AF_IUCV;
982 *len = sizeof(struct sockaddr_iucv);
983
984 if (peer) {
985 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
986 memcpy(siucv->siucv_name, iucv->dst_name, 8);
987 } else {
988 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
989 memcpy(siucv->siucv_name, iucv->src_name, 8);
990 }
991 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
992 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
993 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
994
995 return 0;
996 }
997
998 /**
999 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1000 * @path: IUCV path
1001 * @msg: Pointer to a struct iucv_message
1002 * @skb: The socket data to send, skb->len MUST BE <= 7
1003 *
1004 * Send the socket data in the parameter list in the iucv message
1005 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1006 * list and the socket data len at index 7 (last byte).
1007 * See also iucv_msg_length().
1008 *
1009 * Returns the error code from the iucv_message_send() call.
1010 */
1011 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1012 struct sk_buff *skb)
1013 {
1014 u8 prmdata[8];
1015
1016 memcpy(prmdata, (void *) skb->data, skb->len);
1017 prmdata[7] = 0xff - (u8) skb->len;
1018 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1019 (void *) prmdata, 8);
1020 }
1021
1022 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1023 struct msghdr *msg, size_t len)
1024 {
1025 struct sock *sk = sock->sk;
1026 struct iucv_sock *iucv = iucv_sk(sk);
1027 struct sk_buff *skb;
1028 struct iucv_message txmsg;
1029 struct cmsghdr *cmsg;
1030 int cmsg_done;
1031 long timeo;
1032 char user_id[9];
1033 char appl_id[9];
1034 int err;
1035 int noblock = msg->msg_flags & MSG_DONTWAIT;
1036
1037 err = sock_error(sk);
1038 if (err)
1039 return err;
1040
1041 if (msg->msg_flags & MSG_OOB)
1042 return -EOPNOTSUPP;
1043
1044 /* SOCK_SEQPACKET: we do not support segmented records */
1045 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1046 return -EOPNOTSUPP;
1047
1048 lock_sock(sk);
1049
1050 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1051 err = -EPIPE;
1052 goto out;
1053 }
1054
1055 /* Return if the socket is not in connected state */
1056 if (sk->sk_state != IUCV_CONNECTED) {
1057 err = -ENOTCONN;
1058 goto out;
1059 }
1060
1061 /* initialize defaults */
1062 cmsg_done = 0; /* check for duplicate headers */
1063 txmsg.class = 0;
1064
1065 /* iterate over control messages */
1066 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
1067 cmsg = CMSG_NXTHDR(msg, cmsg)) {
1068
1069 if (!CMSG_OK(msg, cmsg)) {
1070 err = -EINVAL;
1071 goto out;
1072 }
1073
1074 if (cmsg->cmsg_level != SOL_IUCV)
1075 continue;
1076
1077 if (cmsg->cmsg_type & cmsg_done) {
1078 err = -EINVAL;
1079 goto out;
1080 }
1081 cmsg_done |= cmsg->cmsg_type;
1082
1083 switch (cmsg->cmsg_type) {
1084 case SCM_IUCV_TRGCLS:
1085 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1086 err = -EINVAL;
1087 goto out;
1088 }
1089
1090 /* set iucv message target class */
1091 memcpy(&txmsg.class,
1092 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1093
1094 break;
1095
1096 default:
1097 err = -EINVAL;
1098 goto out;
1099 break;
1100 }
1101 }
1102
1103 /* allocate one skb for each iucv message:
1104 * this is fine for SOCK_SEQPACKET (unless we want to support
1105 * segmented records using the MSG_EOR flag), but
1106 * for SOCK_STREAM we might want to improve it in future */
1107 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1108 skb = sock_alloc_send_skb(sk,
1109 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1110 noblock, &err);
1111 else
1112 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1113 if (!skb) {
1114 err = -ENOMEM;
1115 goto out;
1116 }
1117 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1118 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1119 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1120 err = -EFAULT;
1121 goto fail;
1122 }
1123
1124 /* wait if outstanding messages for iucv path has reached */
1125 timeo = sock_sndtimeo(sk, noblock);
1126 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1127 if (err)
1128 goto fail;
1129
1130 /* return -ECONNRESET if the socket is no longer connected */
1131 if (sk->sk_state != IUCV_CONNECTED) {
1132 err = -ECONNRESET;
1133 goto fail;
1134 }
1135
1136 /* increment and save iucv message tag for msg_completion cbk */
1137 txmsg.tag = iucv->send_tag++;
1138 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1139
1140 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1141 atomic_inc(&iucv->msg_sent);
1142 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1143 if (err) {
1144 atomic_dec(&iucv->msg_sent);
1145 goto fail;
1146 }
1147 goto release;
1148 }
1149 skb_queue_tail(&iucv->send_skb_q, skb);
1150
1151 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1152 && skb->len <= 7) {
1153 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1154
1155 /* on success: there is no message_complete callback
1156 * for an IPRMDATA msg; remove skb from send queue */
1157 if (err == 0) {
1158 skb_unlink(skb, &iucv->send_skb_q);
1159 kfree_skb(skb);
1160 }
1161
1162 /* this error should never happen since the
1163 * IUCV_IPRMDATA path flag is set... sever path */
1164 if (err == 0x15) {
1165 pr_iucv->path_sever(iucv->path, NULL);
1166 skb_unlink(skb, &iucv->send_skb_q);
1167 err = -EPIPE;
1168 goto fail;
1169 }
1170 } else
1171 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1172 (void *) skb->data, skb->len);
1173 if (err) {
1174 if (err == 3) {
1175 user_id[8] = 0;
1176 memcpy(user_id, iucv->dst_user_id, 8);
1177 appl_id[8] = 0;
1178 memcpy(appl_id, iucv->dst_name, 8);
1179 pr_err("Application %s on z/VM guest %s"
1180 " exceeds message limit\n",
1181 appl_id, user_id);
1182 err = -EAGAIN;
1183 } else
1184 err = -EPIPE;
1185 skb_unlink(skb, &iucv->send_skb_q);
1186 goto fail;
1187 }
1188
1189 release:
1190 release_sock(sk);
1191 return len;
1192
1193 fail:
1194 kfree_skb(skb);
1195 out:
1196 release_sock(sk);
1197 return err;
1198 }
1199
1200 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1201 *
1202 * Locking: must be called with message_q.lock held
1203 */
1204 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1205 {
1206 int dataleft, size, copied = 0;
1207 struct sk_buff *nskb;
1208
1209 dataleft = len;
1210 while (dataleft) {
1211 if (dataleft >= sk->sk_rcvbuf / 4)
1212 size = sk->sk_rcvbuf / 4;
1213 else
1214 size = dataleft;
1215
1216 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1217 if (!nskb)
1218 return -ENOMEM;
1219
1220 /* copy target class to control buffer of new skb */
1221 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1222
1223 /* copy data fragment */
1224 memcpy(nskb->data, skb->data + copied, size);
1225 copied += size;
1226 dataleft -= size;
1227
1228 skb_reset_transport_header(nskb);
1229 skb_reset_network_header(nskb);
1230 nskb->len = size;
1231
1232 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1233 }
1234
1235 return 0;
1236 }
1237
1238 /* iucv_process_message() - Receive a single outstanding IUCV message
1239 *
1240 * Locking: must be called with message_q.lock held
1241 */
1242 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1243 struct iucv_path *path,
1244 struct iucv_message *msg)
1245 {
1246 int rc;
1247 unsigned int len;
1248
1249 len = iucv_msg_length(msg);
1250
1251 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1252 /* Note: the first 4 bytes are reserved for msg tag */
1253 IUCV_SKB_CB(skb)->class = msg->class;
1254
1255 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1256 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1257 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1258 skb->data = NULL;
1259 skb->len = 0;
1260 }
1261 } else {
1262 rc = pr_iucv->message_receive(path, msg,
1263 msg->flags & IUCV_IPRMDATA,
1264 skb->data, len, NULL);
1265 if (rc) {
1266 kfree_skb(skb);
1267 return;
1268 }
1269 /* we need to fragment iucv messages for SOCK_STREAM only;
1270 * for SOCK_SEQPACKET, it is only relevant if we support
1271 * record segmentation using MSG_EOR (see also recvmsg()) */
1272 if (sk->sk_type == SOCK_STREAM &&
1273 skb->truesize >= sk->sk_rcvbuf / 4) {
1274 rc = iucv_fragment_skb(sk, skb, len);
1275 kfree_skb(skb);
1276 skb = NULL;
1277 if (rc) {
1278 pr_iucv->path_sever(path, NULL);
1279 return;
1280 }
1281 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1282 } else {
1283 skb_reset_transport_header(skb);
1284 skb_reset_network_header(skb);
1285 skb->len = len;
1286 }
1287 }
1288
1289 IUCV_SKB_CB(skb)->offset = 0;
1290 if (sock_queue_rcv_skb(sk, skb))
1291 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1292 }
1293
1294 /* iucv_process_message_q() - Process outstanding IUCV messages
1295 *
1296 * Locking: must be called with message_q.lock held
1297 */
1298 static void iucv_process_message_q(struct sock *sk)
1299 {
1300 struct iucv_sock *iucv = iucv_sk(sk);
1301 struct sk_buff *skb;
1302 struct sock_msg_q *p, *n;
1303
1304 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1305 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1306 if (!skb)
1307 break;
1308 iucv_process_message(sk, skb, p->path, &p->msg);
1309 list_del(&p->list);
1310 kfree(p);
1311 if (!skb_queue_empty(&iucv->backlog_skb_q))
1312 break;
1313 }
1314 }
1315
1316 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1317 struct msghdr *msg, size_t len, int flags)
1318 {
1319 int noblock = flags & MSG_DONTWAIT;
1320 struct sock *sk = sock->sk;
1321 struct iucv_sock *iucv = iucv_sk(sk);
1322 unsigned int copied, rlen;
1323 struct sk_buff *skb, *rskb, *cskb;
1324 int err = 0;
1325 u32 offset;
1326
1327 msg->msg_namelen = 0;
1328
1329 if ((sk->sk_state == IUCV_DISCONN) &&
1330 skb_queue_empty(&iucv->backlog_skb_q) &&
1331 skb_queue_empty(&sk->sk_receive_queue) &&
1332 list_empty(&iucv->message_q.list))
1333 return 0;
1334
1335 if (flags & (MSG_OOB))
1336 return -EOPNOTSUPP;
1337
1338 /* receive/dequeue next skb:
1339 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1340 skb = skb_recv_datagram(sk, flags, noblock, &err);
1341 if (!skb) {
1342 if (sk->sk_shutdown & RCV_SHUTDOWN)
1343 return 0;
1344 return err;
1345 }
1346
1347 offset = IUCV_SKB_CB(skb)->offset;
1348 rlen = skb->len - offset; /* real length of skb */
1349 copied = min_t(unsigned int, rlen, len);
1350 if (!rlen)
1351 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1352
1353 cskb = skb;
1354 if (skb_copy_datagram_iovec(cskb, offset, msg->msg_iov, copied)) {
1355 if (!(flags & MSG_PEEK))
1356 skb_queue_head(&sk->sk_receive_queue, skb);
1357 return -EFAULT;
1358 }
1359
1360 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1361 if (sk->sk_type == SOCK_SEQPACKET) {
1362 if (copied < rlen)
1363 msg->msg_flags |= MSG_TRUNC;
1364 /* each iucv message contains a complete record */
1365 msg->msg_flags |= MSG_EOR;
1366 }
1367
1368 /* create control message to store iucv msg target class:
1369 * get the trgcls from the control buffer of the skb due to
1370 * fragmentation of original iucv message. */
1371 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1372 sizeof(IUCV_SKB_CB(skb)->class),
1373 (void *)&IUCV_SKB_CB(skb)->class);
1374 if (err) {
1375 if (!(flags & MSG_PEEK))
1376 skb_queue_head(&sk->sk_receive_queue, skb);
1377 return err;
1378 }
1379
1380 /* Mark read part of skb as used */
1381 if (!(flags & MSG_PEEK)) {
1382
1383 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1384 if (sk->sk_type == SOCK_STREAM) {
1385 if (copied < rlen) {
1386 IUCV_SKB_CB(skb)->offset = offset + copied;
1387 goto done;
1388 }
1389 }
1390
1391 kfree_skb(skb);
1392 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1393 atomic_inc(&iucv->msg_recv);
1394 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1395 WARN_ON(1);
1396 iucv_sock_close(sk);
1397 return -EFAULT;
1398 }
1399 }
1400
1401 /* Queue backlog skbs */
1402 spin_lock_bh(&iucv->message_q.lock);
1403 rskb = skb_dequeue(&iucv->backlog_skb_q);
1404 while (rskb) {
1405 IUCV_SKB_CB(rskb)->offset = 0;
1406 if (sock_queue_rcv_skb(sk, rskb)) {
1407 skb_queue_head(&iucv->backlog_skb_q,
1408 rskb);
1409 break;
1410 } else {
1411 rskb = skb_dequeue(&iucv->backlog_skb_q);
1412 }
1413 }
1414 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1415 if (!list_empty(&iucv->message_q.list))
1416 iucv_process_message_q(sk);
1417 if (atomic_read(&iucv->msg_recv) >=
1418 iucv->msglimit / 2) {
1419 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1420 if (err) {
1421 sk->sk_state = IUCV_DISCONN;
1422 sk->sk_state_change(sk);
1423 }
1424 }
1425 }
1426 spin_unlock_bh(&iucv->message_q.lock);
1427 }
1428
1429 done:
1430 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1431 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1432 copied = rlen;
1433
1434 return copied;
1435 }
1436
1437 static inline unsigned int iucv_accept_poll(struct sock *parent)
1438 {
1439 struct iucv_sock *isk, *n;
1440 struct sock *sk;
1441
1442 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1443 sk = (struct sock *) isk;
1444
1445 if (sk->sk_state == IUCV_CONNECTED)
1446 return POLLIN | POLLRDNORM;
1447 }
1448
1449 return 0;
1450 }
1451
1452 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1453 poll_table *wait)
1454 {
1455 struct sock *sk = sock->sk;
1456 unsigned int mask = 0;
1457
1458 sock_poll_wait(file, sk_sleep(sk), wait);
1459
1460 if (sk->sk_state == IUCV_LISTEN)
1461 return iucv_accept_poll(sk);
1462
1463 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1464 mask |= POLLERR |
1465 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1466
1467 if (sk->sk_shutdown & RCV_SHUTDOWN)
1468 mask |= POLLRDHUP;
1469
1470 if (sk->sk_shutdown == SHUTDOWN_MASK)
1471 mask |= POLLHUP;
1472
1473 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1474 (sk->sk_shutdown & RCV_SHUTDOWN))
1475 mask |= POLLIN | POLLRDNORM;
1476
1477 if (sk->sk_state == IUCV_CLOSED)
1478 mask |= POLLHUP;
1479
1480 if (sk->sk_state == IUCV_DISCONN)
1481 mask |= POLLIN;
1482
1483 if (sock_writeable(sk) && iucv_below_msglim(sk))
1484 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1485 else
1486 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1487
1488 return mask;
1489 }
1490
1491 static int iucv_sock_shutdown(struct socket *sock, int how)
1492 {
1493 struct sock *sk = sock->sk;
1494 struct iucv_sock *iucv = iucv_sk(sk);
1495 struct iucv_message txmsg;
1496 int err = 0;
1497
1498 how++;
1499
1500 if ((how & ~SHUTDOWN_MASK) || !how)
1501 return -EINVAL;
1502
1503 lock_sock(sk);
1504 switch (sk->sk_state) {
1505 case IUCV_LISTEN:
1506 case IUCV_DISCONN:
1507 case IUCV_CLOSING:
1508 case IUCV_CLOSED:
1509 err = -ENOTCONN;
1510 goto fail;
1511 default:
1512 break;
1513 }
1514
1515 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1516 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1517 txmsg.class = 0;
1518 txmsg.tag = 0;
1519 err = pr_iucv->message_send(iucv->path, &txmsg,
1520 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1521 if (err) {
1522 switch (err) {
1523 case 1:
1524 err = -ENOTCONN;
1525 break;
1526 case 2:
1527 err = -ECONNRESET;
1528 break;
1529 default:
1530 err = -ENOTCONN;
1531 break;
1532 }
1533 }
1534 } else
1535 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1536 }
1537
1538 sk->sk_shutdown |= how;
1539 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1540 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1541 err = pr_iucv->path_quiesce(iucv->path, NULL);
1542 if (err)
1543 err = -ENOTCONN;
1544 /* skb_queue_purge(&sk->sk_receive_queue); */
1545 }
1546 skb_queue_purge(&sk->sk_receive_queue);
1547 }
1548
1549 /* Wake up anyone sleeping in poll */
1550 sk->sk_state_change(sk);
1551
1552 fail:
1553 release_sock(sk);
1554 return err;
1555 }
1556
1557 static int iucv_sock_release(struct socket *sock)
1558 {
1559 struct sock *sk = sock->sk;
1560 int err = 0;
1561
1562 if (!sk)
1563 return 0;
1564
1565 iucv_sock_close(sk);
1566
1567 sock_orphan(sk);
1568 iucv_sock_kill(sk);
1569 return err;
1570 }
1571
1572 /* getsockopt and setsockopt */
1573 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1574 char __user *optval, unsigned int optlen)
1575 {
1576 struct sock *sk = sock->sk;
1577 struct iucv_sock *iucv = iucv_sk(sk);
1578 int val;
1579 int rc;
1580
1581 if (level != SOL_IUCV)
1582 return -ENOPROTOOPT;
1583
1584 if (optlen < sizeof(int))
1585 return -EINVAL;
1586
1587 if (get_user(val, (int __user *) optval))
1588 return -EFAULT;
1589
1590 rc = 0;
1591
1592 lock_sock(sk);
1593 switch (optname) {
1594 case SO_IPRMDATA_MSG:
1595 if (val)
1596 iucv->flags |= IUCV_IPRMDATA;
1597 else
1598 iucv->flags &= ~IUCV_IPRMDATA;
1599 break;
1600 case SO_MSGLIMIT:
1601 switch (sk->sk_state) {
1602 case IUCV_OPEN:
1603 case IUCV_BOUND:
1604 if (val < 1 || val > (u16)(~0))
1605 rc = -EINVAL;
1606 else
1607 iucv->msglimit = val;
1608 break;
1609 default:
1610 rc = -EINVAL;
1611 break;
1612 }
1613 break;
1614 default:
1615 rc = -ENOPROTOOPT;
1616 break;
1617 }
1618 release_sock(sk);
1619
1620 return rc;
1621 }
1622
1623 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1624 char __user *optval, int __user *optlen)
1625 {
1626 struct sock *sk = sock->sk;
1627 struct iucv_sock *iucv = iucv_sk(sk);
1628 unsigned int val;
1629 int len;
1630
1631 if (level != SOL_IUCV)
1632 return -ENOPROTOOPT;
1633
1634 if (get_user(len, optlen))
1635 return -EFAULT;
1636
1637 if (len < 0)
1638 return -EINVAL;
1639
1640 len = min_t(unsigned int, len, sizeof(int));
1641
1642 switch (optname) {
1643 case SO_IPRMDATA_MSG:
1644 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1645 break;
1646 case SO_MSGLIMIT:
1647 lock_sock(sk);
1648 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1649 : iucv->msglimit; /* default */
1650 release_sock(sk);
1651 break;
1652 case SO_MSGSIZE:
1653 if (sk->sk_state == IUCV_OPEN)
1654 return -EBADFD;
1655 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1656 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1657 0x7fffffff;
1658 break;
1659 default:
1660 return -ENOPROTOOPT;
1661 }
1662
1663 if (put_user(len, optlen))
1664 return -EFAULT;
1665 if (copy_to_user(optval, &val, len))
1666 return -EFAULT;
1667
1668 return 0;
1669 }
1670
1671
1672 /* Callback wrappers - called from iucv base support */
1673 static int iucv_callback_connreq(struct iucv_path *path,
1674 u8 ipvmid[8], u8 ipuser[16])
1675 {
1676 unsigned char user_data[16];
1677 unsigned char nuser_data[16];
1678 unsigned char src_name[8];
1679 struct sock *sk, *nsk;
1680 struct iucv_sock *iucv, *niucv;
1681 int err;
1682
1683 memcpy(src_name, ipuser, 8);
1684 EBCASC(src_name, 8);
1685 /* Find out if this path belongs to af_iucv. */
1686 read_lock(&iucv_sk_list.lock);
1687 iucv = NULL;
1688 sk = NULL;
1689 sk_for_each(sk, &iucv_sk_list.head)
1690 if (sk->sk_state == IUCV_LISTEN &&
1691 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1692 /*
1693 * Found a listening socket with
1694 * src_name == ipuser[0-7].
1695 */
1696 iucv = iucv_sk(sk);
1697 break;
1698 }
1699 read_unlock(&iucv_sk_list.lock);
1700 if (!iucv)
1701 /* No socket found, not one of our paths. */
1702 return -EINVAL;
1703
1704 bh_lock_sock(sk);
1705
1706 /* Check if parent socket is listening */
1707 low_nmcpy(user_data, iucv->src_name);
1708 high_nmcpy(user_data, iucv->dst_name);
1709 ASCEBC(user_data, sizeof(user_data));
1710 if (sk->sk_state != IUCV_LISTEN) {
1711 err = pr_iucv->path_sever(path, user_data);
1712 iucv_path_free(path);
1713 goto fail;
1714 }
1715
1716 /* Check for backlog size */
1717 if (sk_acceptq_is_full(sk)) {
1718 err = pr_iucv->path_sever(path, user_data);
1719 iucv_path_free(path);
1720 goto fail;
1721 }
1722
1723 /* Create the new socket */
1724 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1725 if (!nsk) {
1726 err = pr_iucv->path_sever(path, user_data);
1727 iucv_path_free(path);
1728 goto fail;
1729 }
1730
1731 niucv = iucv_sk(nsk);
1732 iucv_sock_init(nsk, sk);
1733
1734 /* Set the new iucv_sock */
1735 memcpy(niucv->dst_name, ipuser + 8, 8);
1736 EBCASC(niucv->dst_name, 8);
1737 memcpy(niucv->dst_user_id, ipvmid, 8);
1738 memcpy(niucv->src_name, iucv->src_name, 8);
1739 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1740 niucv->path = path;
1741
1742 /* Call iucv_accept */
1743 high_nmcpy(nuser_data, ipuser + 8);
1744 memcpy(nuser_data + 8, niucv->src_name, 8);
1745 ASCEBC(nuser_data + 8, 8);
1746
1747 /* set message limit for path based on msglimit of accepting socket */
1748 niucv->msglimit = iucv->msglimit;
1749 path->msglim = iucv->msglimit;
1750 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1751 if (err) {
1752 iucv_sever_path(nsk, 1);
1753 iucv_sock_kill(nsk);
1754 goto fail;
1755 }
1756
1757 iucv_accept_enqueue(sk, nsk);
1758
1759 /* Wake up accept */
1760 nsk->sk_state = IUCV_CONNECTED;
1761 sk->sk_data_ready(sk, 1);
1762 err = 0;
1763 fail:
1764 bh_unlock_sock(sk);
1765 return 0;
1766 }
1767
1768 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1769 {
1770 struct sock *sk = path->private;
1771
1772 sk->sk_state = IUCV_CONNECTED;
1773 sk->sk_state_change(sk);
1774 }
1775
1776 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1777 {
1778 struct sock *sk = path->private;
1779 struct iucv_sock *iucv = iucv_sk(sk);
1780 struct sk_buff *skb;
1781 struct sock_msg_q *save_msg;
1782 int len;
1783
1784 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1785 pr_iucv->message_reject(path, msg);
1786 return;
1787 }
1788
1789 spin_lock(&iucv->message_q.lock);
1790
1791 if (!list_empty(&iucv->message_q.list) ||
1792 !skb_queue_empty(&iucv->backlog_skb_q))
1793 goto save_message;
1794
1795 len = atomic_read(&sk->sk_rmem_alloc);
1796 len += SKB_TRUESIZE(iucv_msg_length(msg));
1797 if (len > sk->sk_rcvbuf)
1798 goto save_message;
1799
1800 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1801 if (!skb)
1802 goto save_message;
1803
1804 iucv_process_message(sk, skb, path, msg);
1805 goto out_unlock;
1806
1807 save_message:
1808 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1809 if (!save_msg)
1810 goto out_unlock;
1811 save_msg->path = path;
1812 save_msg->msg = *msg;
1813
1814 list_add_tail(&save_msg->list, &iucv->message_q.list);
1815
1816 out_unlock:
1817 spin_unlock(&iucv->message_q.lock);
1818 }
1819
1820 static void iucv_callback_txdone(struct iucv_path *path,
1821 struct iucv_message *msg)
1822 {
1823 struct sock *sk = path->private;
1824 struct sk_buff *this = NULL;
1825 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1826 struct sk_buff *list_skb = list->next;
1827 unsigned long flags;
1828
1829 bh_lock_sock(sk);
1830 if (!skb_queue_empty(list)) {
1831 spin_lock_irqsave(&list->lock, flags);
1832
1833 while (list_skb != (struct sk_buff *)list) {
1834 if (msg->tag != IUCV_SKB_CB(list_skb)->tag) {
1835 this = list_skb;
1836 break;
1837 }
1838 list_skb = list_skb->next;
1839 }
1840 if (this)
1841 __skb_unlink(this, list);
1842
1843 spin_unlock_irqrestore(&list->lock, flags);
1844
1845 if (this) {
1846 kfree_skb(this);
1847 /* wake up any process waiting for sending */
1848 iucv_sock_wake_msglim(sk);
1849 }
1850 }
1851
1852 if (sk->sk_state == IUCV_CLOSING) {
1853 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1854 sk->sk_state = IUCV_CLOSED;
1855 sk->sk_state_change(sk);
1856 }
1857 }
1858 bh_unlock_sock(sk);
1859
1860 }
1861
1862 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1863 {
1864 struct sock *sk = path->private;
1865
1866 if (sk->sk_state == IUCV_CLOSED)
1867 return;
1868
1869 bh_lock_sock(sk);
1870 iucv_sever_path(sk, 1);
1871 sk->sk_state = IUCV_DISCONN;
1872
1873 sk->sk_state_change(sk);
1874 bh_unlock_sock(sk);
1875 }
1876
1877 /* called if the other communication side shuts down its RECV direction;
1878 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1879 */
1880 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1881 {
1882 struct sock *sk = path->private;
1883
1884 bh_lock_sock(sk);
1885 if (sk->sk_state != IUCV_CLOSED) {
1886 sk->sk_shutdown |= SEND_SHUTDOWN;
1887 sk->sk_state_change(sk);
1888 }
1889 bh_unlock_sock(sk);
1890 }
1891
1892 /***************** HiperSockets transport callbacks ********************/
1893 static void afiucv_swap_src_dest(struct sk_buff *skb)
1894 {
1895 struct af_iucv_trans_hdr *trans_hdr =
1896 (struct af_iucv_trans_hdr *)skb->data;
1897 char tmpID[8];
1898 char tmpName[8];
1899
1900 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1901 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1902 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1903 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1904 memcpy(tmpID, trans_hdr->srcUserID, 8);
1905 memcpy(tmpName, trans_hdr->srcAppName, 8);
1906 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1907 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1908 memcpy(trans_hdr->destUserID, tmpID, 8);
1909 memcpy(trans_hdr->destAppName, tmpName, 8);
1910 skb_push(skb, ETH_HLEN);
1911 memset(skb->data, 0, ETH_HLEN);
1912 }
1913
1914 /**
1915 * afiucv_hs_callback_syn - react on received SYN
1916 **/
1917 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1918 {
1919 struct sock *nsk;
1920 struct iucv_sock *iucv, *niucv;
1921 struct af_iucv_trans_hdr *trans_hdr;
1922 int err;
1923
1924 iucv = iucv_sk(sk);
1925 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1926 if (!iucv) {
1927 /* no sock - connection refused */
1928 afiucv_swap_src_dest(skb);
1929 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1930 err = dev_queue_xmit(skb);
1931 goto out;
1932 }
1933
1934 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1935 bh_lock_sock(sk);
1936 if ((sk->sk_state != IUCV_LISTEN) ||
1937 sk_acceptq_is_full(sk) ||
1938 !nsk) {
1939 /* error on server socket - connection refused */
1940 if (nsk)
1941 sk_free(nsk);
1942 afiucv_swap_src_dest(skb);
1943 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1944 err = dev_queue_xmit(skb);
1945 bh_unlock_sock(sk);
1946 goto out;
1947 }
1948
1949 niucv = iucv_sk(nsk);
1950 iucv_sock_init(nsk, sk);
1951 niucv->transport = AF_IUCV_TRANS_HIPER;
1952 niucv->msglimit = iucv->msglimit;
1953 if (!trans_hdr->window)
1954 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1955 else
1956 niucv->msglimit_peer = trans_hdr->window;
1957 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1958 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1959 memcpy(niucv->src_name, iucv->src_name, 8);
1960 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1961 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1962 niucv->hs_dev = iucv->hs_dev;
1963 dev_hold(niucv->hs_dev);
1964 afiucv_swap_src_dest(skb);
1965 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1966 trans_hdr->window = niucv->msglimit;
1967 /* if receiver acks the xmit connection is established */
1968 err = dev_queue_xmit(skb);
1969 if (!err) {
1970 iucv_accept_enqueue(sk, nsk);
1971 nsk->sk_state = IUCV_CONNECTED;
1972 sk->sk_data_ready(sk, 1);
1973 } else
1974 iucv_sock_kill(nsk);
1975 bh_unlock_sock(sk);
1976
1977 out:
1978 return NET_RX_SUCCESS;
1979 }
1980
1981 /**
1982 * afiucv_hs_callback_synack() - react on received SYN-ACK
1983 **/
1984 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1985 {
1986 struct iucv_sock *iucv = iucv_sk(sk);
1987 struct af_iucv_trans_hdr *trans_hdr =
1988 (struct af_iucv_trans_hdr *)skb->data;
1989
1990 if (!iucv)
1991 goto out;
1992 if (sk->sk_state != IUCV_BOUND)
1993 goto out;
1994 bh_lock_sock(sk);
1995 iucv->msglimit_peer = trans_hdr->window;
1996 sk->sk_state = IUCV_CONNECTED;
1997 sk->sk_state_change(sk);
1998 bh_unlock_sock(sk);
1999 out:
2000 kfree_skb(skb);
2001 return NET_RX_SUCCESS;
2002 }
2003
2004 /**
2005 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2006 **/
2007 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2008 {
2009 struct iucv_sock *iucv = iucv_sk(sk);
2010
2011 if (!iucv)
2012 goto out;
2013 if (sk->sk_state != IUCV_BOUND)
2014 goto out;
2015 bh_lock_sock(sk);
2016 sk->sk_state = IUCV_DISCONN;
2017 sk->sk_state_change(sk);
2018 bh_unlock_sock(sk);
2019 out:
2020 kfree_skb(skb);
2021 return NET_RX_SUCCESS;
2022 }
2023
2024 /**
2025 * afiucv_hs_callback_fin() - react on received FIN
2026 **/
2027 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2028 {
2029 struct iucv_sock *iucv = iucv_sk(sk);
2030
2031 /* other end of connection closed */
2032 if (!iucv)
2033 goto out;
2034 bh_lock_sock(sk);
2035 if (sk->sk_state == IUCV_CONNECTED) {
2036 sk->sk_state = IUCV_DISCONN;
2037 sk->sk_state_change(sk);
2038 }
2039 bh_unlock_sock(sk);
2040 out:
2041 kfree_skb(skb);
2042 return NET_RX_SUCCESS;
2043 }
2044
2045 /**
2046 * afiucv_hs_callback_win() - react on received WIN
2047 **/
2048 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2049 {
2050 struct iucv_sock *iucv = iucv_sk(sk);
2051 struct af_iucv_trans_hdr *trans_hdr =
2052 (struct af_iucv_trans_hdr *)skb->data;
2053
2054 if (!iucv)
2055 return NET_RX_SUCCESS;
2056
2057 if (sk->sk_state != IUCV_CONNECTED)
2058 return NET_RX_SUCCESS;
2059
2060 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2061 iucv_sock_wake_msglim(sk);
2062 return NET_RX_SUCCESS;
2063 }
2064
2065 /**
2066 * afiucv_hs_callback_rx() - react on received data
2067 **/
2068 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2069 {
2070 struct iucv_sock *iucv = iucv_sk(sk);
2071
2072 if (!iucv) {
2073 kfree_skb(skb);
2074 return NET_RX_SUCCESS;
2075 }
2076
2077 if (sk->sk_state != IUCV_CONNECTED) {
2078 kfree_skb(skb);
2079 return NET_RX_SUCCESS;
2080 }
2081
2082 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2083 kfree_skb(skb);
2084 return NET_RX_SUCCESS;
2085 }
2086
2087 /* write stuff from iucv_msg to skb cb */
2088 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2089 kfree_skb(skb);
2090 return NET_RX_SUCCESS;
2091 }
2092 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2093 skb_reset_transport_header(skb);
2094 skb_reset_network_header(skb);
2095 IUCV_SKB_CB(skb)->offset = 0;
2096 spin_lock(&iucv->message_q.lock);
2097 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2098 if (sock_queue_rcv_skb(sk, skb)) {
2099 /* handle rcv queue full */
2100 skb_queue_tail(&iucv->backlog_skb_q, skb);
2101 }
2102 } else
2103 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2104 spin_unlock(&iucv->message_q.lock);
2105 return NET_RX_SUCCESS;
2106 }
2107
2108 /**
2109 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2110 * transport
2111 * called from netif RX softirq
2112 **/
2113 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2114 struct packet_type *pt, struct net_device *orig_dev)
2115 {
2116 struct sock *sk;
2117 struct iucv_sock *iucv;
2118 struct af_iucv_trans_hdr *trans_hdr;
2119 char nullstring[8];
2120 int err = 0;
2121
2122 skb_pull(skb, ETH_HLEN);
2123 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2124 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2125 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2126 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2127 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2128 memset(nullstring, 0, sizeof(nullstring));
2129 iucv = NULL;
2130 sk = NULL;
2131 read_lock(&iucv_sk_list.lock);
2132 sk_for_each(sk, &iucv_sk_list.head) {
2133 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2134 if ((!memcmp(&iucv_sk(sk)->src_name,
2135 trans_hdr->destAppName, 8)) &&
2136 (!memcmp(&iucv_sk(sk)->src_user_id,
2137 trans_hdr->destUserID, 8)) &&
2138 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2139 (!memcmp(&iucv_sk(sk)->dst_user_id,
2140 nullstring, 8))) {
2141 iucv = iucv_sk(sk);
2142 break;
2143 }
2144 } else {
2145 if ((!memcmp(&iucv_sk(sk)->src_name,
2146 trans_hdr->destAppName, 8)) &&
2147 (!memcmp(&iucv_sk(sk)->src_user_id,
2148 trans_hdr->destUserID, 8)) &&
2149 (!memcmp(&iucv_sk(sk)->dst_name,
2150 trans_hdr->srcAppName, 8)) &&
2151 (!memcmp(&iucv_sk(sk)->dst_user_id,
2152 trans_hdr->srcUserID, 8))) {
2153 iucv = iucv_sk(sk);
2154 break;
2155 }
2156 }
2157 }
2158 read_unlock(&iucv_sk_list.lock);
2159 if (!iucv)
2160 sk = NULL;
2161
2162 /* no sock
2163 how should we send with no sock
2164 1) send without sock no send rc checking?
2165 2) introduce default sock to handle this cases
2166
2167 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2168 data -> send FIN
2169 SYN|ACK, SYN|FIN, FIN -> no action? */
2170
2171 switch (trans_hdr->flags) {
2172 case AF_IUCV_FLAG_SYN:
2173 /* connect request */
2174 err = afiucv_hs_callback_syn(sk, skb);
2175 break;
2176 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2177 /* connect request confirmed */
2178 err = afiucv_hs_callback_synack(sk, skb);
2179 break;
2180 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2181 /* connect request refused */
2182 err = afiucv_hs_callback_synfin(sk, skb);
2183 break;
2184 case (AF_IUCV_FLAG_FIN):
2185 /* close request */
2186 err = afiucv_hs_callback_fin(sk, skb);
2187 break;
2188 case (AF_IUCV_FLAG_WIN):
2189 err = afiucv_hs_callback_win(sk, skb);
2190 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2191 kfree_skb(skb);
2192 break;
2193 }
2194 /* fall through and receive non-zero length data */
2195 case (AF_IUCV_FLAG_SHT):
2196 /* shutdown request */
2197 /* fall through and receive zero length data */
2198 case 0:
2199 /* plain data frame */
2200 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2201 err = afiucv_hs_callback_rx(sk, skb);
2202 break;
2203 default:
2204 ;
2205 }
2206
2207 return err;
2208 }
2209
2210 /**
2211 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2212 * transport
2213 **/
2214 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2215 enum iucv_tx_notify n)
2216 {
2217 struct sock *isk = skb->sk;
2218 struct sock *sk = NULL;
2219 struct iucv_sock *iucv = NULL;
2220 struct sk_buff_head *list;
2221 struct sk_buff *list_skb;
2222 struct sk_buff *nskb;
2223 unsigned long flags;
2224
2225 read_lock_irqsave(&iucv_sk_list.lock, flags);
2226 sk_for_each(sk, &iucv_sk_list.head)
2227 if (sk == isk) {
2228 iucv = iucv_sk(sk);
2229 break;
2230 }
2231 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2232
2233 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2234 return;
2235
2236 list = &iucv->send_skb_q;
2237 spin_lock_irqsave(&list->lock, flags);
2238 if (skb_queue_empty(list))
2239 goto out_unlock;
2240 list_skb = list->next;
2241 nskb = list_skb->next;
2242 while (list_skb != (struct sk_buff *)list) {
2243 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2244 switch (n) {
2245 case TX_NOTIFY_OK:
2246 __skb_unlink(list_skb, list);
2247 kfree_skb(list_skb);
2248 iucv_sock_wake_msglim(sk);
2249 break;
2250 case TX_NOTIFY_PENDING:
2251 atomic_inc(&iucv->pendings);
2252 break;
2253 case TX_NOTIFY_DELAYED_OK:
2254 __skb_unlink(list_skb, list);
2255 atomic_dec(&iucv->pendings);
2256 if (atomic_read(&iucv->pendings) <= 0)
2257 iucv_sock_wake_msglim(sk);
2258 kfree_skb(list_skb);
2259 break;
2260 case TX_NOTIFY_UNREACHABLE:
2261 case TX_NOTIFY_DELAYED_UNREACHABLE:
2262 case TX_NOTIFY_TPQFULL: /* not yet used */
2263 case TX_NOTIFY_GENERALERROR:
2264 case TX_NOTIFY_DELAYED_GENERALERROR:
2265 __skb_unlink(list_skb, list);
2266 kfree_skb(list_skb);
2267 if (sk->sk_state == IUCV_CONNECTED) {
2268 sk->sk_state = IUCV_DISCONN;
2269 sk->sk_state_change(sk);
2270 }
2271 break;
2272 }
2273 break;
2274 }
2275 list_skb = nskb;
2276 nskb = nskb->next;
2277 }
2278 out_unlock:
2279 spin_unlock_irqrestore(&list->lock, flags);
2280
2281 if (sk->sk_state == IUCV_CLOSING) {
2282 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2283 sk->sk_state = IUCV_CLOSED;
2284 sk->sk_state_change(sk);
2285 }
2286 }
2287
2288 }
2289
2290 /*
2291 * afiucv_netdev_event: handle netdev notifier chain events
2292 */
2293 static int afiucv_netdev_event(struct notifier_block *this,
2294 unsigned long event, void *ptr)
2295 {
2296 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2297 struct sock *sk;
2298 struct iucv_sock *iucv;
2299
2300 switch (event) {
2301 case NETDEV_REBOOT:
2302 case NETDEV_GOING_DOWN:
2303 sk_for_each(sk, &iucv_sk_list.head) {
2304 iucv = iucv_sk(sk);
2305 if ((iucv->hs_dev == event_dev) &&
2306 (sk->sk_state == IUCV_CONNECTED)) {
2307 if (event == NETDEV_GOING_DOWN)
2308 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2309 sk->sk_state = IUCV_DISCONN;
2310 sk->sk_state_change(sk);
2311 }
2312 }
2313 break;
2314 case NETDEV_DOWN:
2315 case NETDEV_UNREGISTER:
2316 default:
2317 break;
2318 }
2319 return NOTIFY_DONE;
2320 }
2321
2322 static struct notifier_block afiucv_netdev_notifier = {
2323 .notifier_call = afiucv_netdev_event,
2324 };
2325
2326 static const struct proto_ops iucv_sock_ops = {
2327 .family = PF_IUCV,
2328 .owner = THIS_MODULE,
2329 .release = iucv_sock_release,
2330 .bind = iucv_sock_bind,
2331 .connect = iucv_sock_connect,
2332 .listen = iucv_sock_listen,
2333 .accept = iucv_sock_accept,
2334 .getname = iucv_sock_getname,
2335 .sendmsg = iucv_sock_sendmsg,
2336 .recvmsg = iucv_sock_recvmsg,
2337 .poll = iucv_sock_poll,
2338 .ioctl = sock_no_ioctl,
2339 .mmap = sock_no_mmap,
2340 .socketpair = sock_no_socketpair,
2341 .shutdown = iucv_sock_shutdown,
2342 .setsockopt = iucv_sock_setsockopt,
2343 .getsockopt = iucv_sock_getsockopt,
2344 };
2345
2346 static const struct net_proto_family iucv_sock_family_ops = {
2347 .family = AF_IUCV,
2348 .owner = THIS_MODULE,
2349 .create = iucv_sock_create,
2350 };
2351
2352 static struct packet_type iucv_packet_type = {
2353 .type = cpu_to_be16(ETH_P_AF_IUCV),
2354 .func = afiucv_hs_rcv,
2355 };
2356
2357 static int afiucv_iucv_init(void)
2358 {
2359 int err;
2360
2361 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2362 if (err)
2363 goto out;
2364 /* establish dummy device */
2365 af_iucv_driver.bus = pr_iucv->bus;
2366 err = driver_register(&af_iucv_driver);
2367 if (err)
2368 goto out_iucv;
2369 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2370 if (!af_iucv_dev) {
2371 err = -ENOMEM;
2372 goto out_driver;
2373 }
2374 dev_set_name(af_iucv_dev, "af_iucv");
2375 af_iucv_dev->bus = pr_iucv->bus;
2376 af_iucv_dev->parent = pr_iucv->root;
2377 af_iucv_dev->release = (void (*)(struct device *))kfree;
2378 af_iucv_dev->driver = &af_iucv_driver;
2379 err = device_register(af_iucv_dev);
2380 if (err)
2381 goto out_driver;
2382 return 0;
2383
2384 out_driver:
2385 driver_unregister(&af_iucv_driver);
2386 out_iucv:
2387 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2388 out:
2389 return err;
2390 }
2391
2392 static int __init afiucv_init(void)
2393 {
2394 int err;
2395
2396 if (MACHINE_IS_VM) {
2397 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2398 if (unlikely(err)) {
2399 WARN_ON(err);
2400 err = -EPROTONOSUPPORT;
2401 goto out;
2402 }
2403
2404 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2405 if (!pr_iucv) {
2406 printk(KERN_WARNING "iucv_if lookup failed\n");
2407 memset(&iucv_userid, 0, sizeof(iucv_userid));
2408 }
2409 } else {
2410 memset(&iucv_userid, 0, sizeof(iucv_userid));
2411 pr_iucv = NULL;
2412 }
2413
2414 err = proto_register(&iucv_proto, 0);
2415 if (err)
2416 goto out;
2417 err = sock_register(&iucv_sock_family_ops);
2418 if (err)
2419 goto out_proto;
2420
2421 if (pr_iucv) {
2422 err = afiucv_iucv_init();
2423 if (err)
2424 goto out_sock;
2425 } else
2426 register_netdevice_notifier(&afiucv_netdev_notifier);
2427 dev_add_pack(&iucv_packet_type);
2428 return 0;
2429
2430 out_sock:
2431 sock_unregister(PF_IUCV);
2432 out_proto:
2433 proto_unregister(&iucv_proto);
2434 out:
2435 if (pr_iucv)
2436 symbol_put(iucv_if);
2437 return err;
2438 }
2439
2440 static void __exit afiucv_exit(void)
2441 {
2442 if (pr_iucv) {
2443 device_unregister(af_iucv_dev);
2444 driver_unregister(&af_iucv_driver);
2445 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2446 symbol_put(iucv_if);
2447 } else
2448 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2449 dev_remove_pack(&iucv_packet_type);
2450 sock_unregister(PF_IUCV);
2451 proto_unregister(&iucv_proto);
2452 }
2453
2454 module_init(afiucv_init);
2455 module_exit(afiucv_exit);
2456
2457 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2458 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2459 MODULE_VERSION(VERSION);
2460 MODULE_LICENSE("GPL");
2461 MODULE_ALIAS_NETPROTO(PF_IUCV);
2462
Linux with added FPC-III support