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