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memcg/sl[au]b: track all the memcg children of a kmem_cache
[linux/fpc-iii.git] / net / iucv / af_iucv.c
blobcd6f7a991d8035bdfc6d883a8bcf21a433405030
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 switch (sk->sk_state) {
169 case IUCV_DISCONN:
170 case IUCV_CLOSING:
171 case IUCV_CONNECTED:
172 iucv_sever_path(sk, 0);
173 break;
174 case IUCV_OPEN:
175 case IUCV_BOUND:
176 case IUCV_LISTEN:
177 case IUCV_CLOSED:
178 default:
179 break;
180 }
181 skb_queue_purge(&iucv->send_skb_q);
182 skb_queue_purge(&iucv->backlog_skb_q);
183 }
184 read_unlock(&iucv_sk_list.lock);
185 return err;
186 }
187
188 /**
189 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
190 * @dev: AFIUCV dummy device
191 *
192 * socket clean up after freeze
193 */
194 static int afiucv_pm_restore_thaw(struct device *dev)
195 {
196 struct sock *sk;
197 struct hlist_node *node;
198
199 #ifdef CONFIG_PM_DEBUG
200 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
201 #endif
202 read_lock(&iucv_sk_list.lock);
203 sk_for_each(sk, node, &iucv_sk_list.head) {
204 switch (sk->sk_state) {
205 case IUCV_CONNECTED:
206 sk->sk_err = EPIPE;
207 sk->sk_state = IUCV_DISCONN;
208 sk->sk_state_change(sk);
209 break;
210 case IUCV_DISCONN:
211 case IUCV_CLOSING:
212 case IUCV_LISTEN:
213 case IUCV_BOUND:
214 case IUCV_OPEN:
215 default:
216 break;
217 }
218 }
219 read_unlock(&iucv_sk_list.lock);
220 return 0;
221 }
222
223 static const struct dev_pm_ops afiucv_pm_ops = {
224 .prepare = afiucv_pm_prepare,
225 .complete = afiucv_pm_complete,
226 .freeze = afiucv_pm_freeze,
227 .thaw = afiucv_pm_restore_thaw,
228 .restore = afiucv_pm_restore_thaw,
229 };
230
231 static struct device_driver af_iucv_driver = {
232 .owner = THIS_MODULE,
233 .name = "afiucv",
234 .bus = NULL,
235 .pm = &afiucv_pm_ops,
236 };
237
238 /* dummy device used as trigger for PM functions */
239 static struct device *af_iucv_dev;
240
241 /**
242 * iucv_msg_length() - Returns the length of an iucv message.
243 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
244 *
245 * The function returns the length of the specified iucv message @msg of data
246 * stored in a buffer and of data stored in the parameter list (PRMDATA).
247 *
248 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
249 * data:
250 * PRMDATA[0..6] socket data (max 7 bytes);
251 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
252 *
253 * The socket data length is computed by subtracting the socket data length
254 * value from 0xFF.
255 * If the socket data len is greater 7, then PRMDATA can be used for special
256 * notifications (see iucv_sock_shutdown); and further,
257 * if the socket data len is > 7, the function returns 8.
258 *
259 * Use this function to allocate socket buffers to store iucv message data.
260 */
261 static inline size_t iucv_msg_length(struct iucv_message *msg)
262 {
263 size_t datalen;
264
265 if (msg->flags & IUCV_IPRMDATA) {
266 datalen = 0xff - msg->rmmsg[7];
267 return (datalen < 8) ? datalen : 8;
268 }
269 return msg->length;
270 }
271
272 /**
273 * iucv_sock_in_state() - check for specific states
274 * @sk: sock structure
275 * @state: first iucv sk state
276 * @state: second iucv sk state
277 *
278 * Returns true if the socket in either in the first or second state.
279 */
280 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
281 {
282 return (sk->sk_state == state || sk->sk_state == state2);
283 }
284
285 /**
286 * iucv_below_msglim() - function to check if messages can be sent
287 * @sk: sock structure
288 *
289 * Returns true if the send queue length is lower than the message limit.
290 * Always returns true if the socket is not connected (no iucv path for
291 * checking the message limit).
292 */
293 static inline int iucv_below_msglim(struct sock *sk)
294 {
295 struct iucv_sock *iucv = iucv_sk(sk);
296
297 if (sk->sk_state != IUCV_CONNECTED)
298 return 1;
299 if (iucv->transport == AF_IUCV_TRANS_IUCV)
300 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
301 else
302 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
303 (atomic_read(&iucv->pendings) <= 0));
304 }
305
306 /**
307 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
308 */
309 static void iucv_sock_wake_msglim(struct sock *sk)
310 {
311 struct socket_wq *wq;
312
313 rcu_read_lock();
314 wq = rcu_dereference(sk->sk_wq);
315 if (wq_has_sleeper(wq))
316 wake_up_interruptible_all(&wq->wait);
317 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
318 rcu_read_unlock();
319 }
320
321 /**
322 * afiucv_hs_send() - send a message through HiperSockets transport
323 */
324 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
325 struct sk_buff *skb, u8 flags)
326 {
327 struct iucv_sock *iucv = iucv_sk(sock);
328 struct af_iucv_trans_hdr *phs_hdr;
329 struct sk_buff *nskb;
330 int err, confirm_recv = 0;
331
332 memset(skb->head, 0, ETH_HLEN);
333 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
334 sizeof(struct af_iucv_trans_hdr));
335 skb_reset_mac_header(skb);
336 skb_reset_network_header(skb);
337 skb_push(skb, ETH_HLEN);
338 skb_reset_mac_header(skb);
339 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
340
341 phs_hdr->magic = ETH_P_AF_IUCV;
342 phs_hdr->version = 1;
343 phs_hdr->flags = flags;
344 if (flags == AF_IUCV_FLAG_SYN)
345 phs_hdr->window = iucv->msglimit;
346 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
347 confirm_recv = atomic_read(&iucv->msg_recv);
348 phs_hdr->window = confirm_recv;
349 if (confirm_recv)
350 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
351 }
352 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
353 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
354 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
355 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
356 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
357 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
358 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
359 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
360 if (imsg)
361 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
362
363 skb->dev = iucv->hs_dev;
364 if (!skb->dev)
365 return -ENODEV;
366 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
367 return -ENETDOWN;
368 if (skb->len > skb->dev->mtu) {
369 if (sock->sk_type == SOCK_SEQPACKET)
370 return -EMSGSIZE;
371 else
372 skb_trim(skb, skb->dev->mtu);
373 }
374 skb->protocol = ETH_P_AF_IUCV;
375 nskb = skb_clone(skb, GFP_ATOMIC);
376 if (!nskb)
377 return -ENOMEM;
378 skb_queue_tail(&iucv->send_skb_q, nskb);
379 err = dev_queue_xmit(skb);
380 if (net_xmit_eval(err)) {
381 skb_unlink(nskb, &iucv->send_skb_q);
382 kfree_skb(nskb);
383 } else {
384 atomic_sub(confirm_recv, &iucv->msg_recv);
385 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
386 }
387 return net_xmit_eval(err);
388 }
389
390 static struct sock *__iucv_get_sock_by_name(char *nm)
391 {
392 struct sock *sk;
393 struct hlist_node *node;
394
395 sk_for_each(sk, node, &iucv_sk_list.head)
396 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
397 return sk;
398
399 return NULL;
400 }
401
402 static void iucv_sock_destruct(struct sock *sk)
403 {
404 skb_queue_purge(&sk->sk_receive_queue);
405 skb_queue_purge(&sk->sk_error_queue);
406
407 sk_mem_reclaim(sk);
408
409 if (!sock_flag(sk, SOCK_DEAD)) {
410 pr_err("Attempt to release alive iucv socket %p\n", sk);
411 return;
412 }
413
414 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
415 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
416 WARN_ON(sk->sk_wmem_queued);
417 WARN_ON(sk->sk_forward_alloc);
418 }
419
420 /* Cleanup Listen */
421 static void iucv_sock_cleanup_listen(struct sock *parent)
422 {
423 struct sock *sk;
424
425 /* Close non-accepted connections */
426 while ((sk = iucv_accept_dequeue(parent, NULL))) {
427 iucv_sock_close(sk);
428 iucv_sock_kill(sk);
429 }
430
431 parent->sk_state = IUCV_CLOSED;
432 }
433
434 /* Kill socket (only if zapped and orphaned) */
435 static void iucv_sock_kill(struct sock *sk)
436 {
437 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
438 return;
439
440 iucv_sock_unlink(&iucv_sk_list, sk);
441 sock_set_flag(sk, SOCK_DEAD);
442 sock_put(sk);
443 }
444
445 /* Terminate an IUCV path */
446 static void iucv_sever_path(struct sock *sk, int with_user_data)
447 {
448 unsigned char user_data[16];
449 struct iucv_sock *iucv = iucv_sk(sk);
450 struct iucv_path *path = iucv->path;
451
452 if (iucv->path) {
453 iucv->path = NULL;
454 if (with_user_data) {
455 low_nmcpy(user_data, iucv->src_name);
456 high_nmcpy(user_data, iucv->dst_name);
457 ASCEBC(user_data, sizeof(user_data));
458 pr_iucv->path_sever(path, user_data);
459 } else
460 pr_iucv->path_sever(path, NULL);
461 iucv_path_free(path);
462 }
463 }
464
465 /* Send FIN through an IUCV socket for HIPER transport */
466 static int iucv_send_ctrl(struct sock *sk, u8 flags)
467 {
468 int err = 0;
469 int blen;
470 struct sk_buff *skb;
471
472 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
473 skb = sock_alloc_send_skb(sk, blen, 1, &err);
474 if (skb) {
475 skb_reserve(skb, blen);
476 err = afiucv_hs_send(NULL, sk, skb, flags);
477 }
478 return err;
479 }
480
481 /* Close an IUCV socket */
482 static void iucv_sock_close(struct sock *sk)
483 {
484 struct iucv_sock *iucv = iucv_sk(sk);
485 unsigned long timeo;
486 int err = 0;
487
488 lock_sock(sk);
489
490 switch (sk->sk_state) {
491 case IUCV_LISTEN:
492 iucv_sock_cleanup_listen(sk);
493 break;
494
495 case IUCV_CONNECTED:
496 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
497 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
498 sk->sk_state = IUCV_DISCONN;
499 sk->sk_state_change(sk);
500 }
501 case IUCV_DISCONN: /* fall through */
502 sk->sk_state = IUCV_CLOSING;
503 sk->sk_state_change(sk);
504
505 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
506 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
507 timeo = sk->sk_lingertime;
508 else
509 timeo = IUCV_DISCONN_TIMEOUT;
510 iucv_sock_wait(sk,
511 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
512 timeo);
513 }
514
515 case IUCV_CLOSING: /* fall through */
516 sk->sk_state = IUCV_CLOSED;
517 sk->sk_state_change(sk);
518
519 sk->sk_err = ECONNRESET;
520 sk->sk_state_change(sk);
521
522 skb_queue_purge(&iucv->send_skb_q);
523 skb_queue_purge(&iucv->backlog_skb_q);
524
525 default: /* fall through */
526 iucv_sever_path(sk, 1);
527 }
528
529 if (iucv->hs_dev) {
530 dev_put(iucv->hs_dev);
531 iucv->hs_dev = NULL;
532 sk->sk_bound_dev_if = 0;
533 }
534
535 /* mark socket for deletion by iucv_sock_kill() */
536 sock_set_flag(sk, SOCK_ZAPPED);
537
538 release_sock(sk);
539 }
540
541 static void iucv_sock_init(struct sock *sk, struct sock *parent)
542 {
543 if (parent)
544 sk->sk_type = parent->sk_type;
545 }
546
547 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
548 {
549 struct sock *sk;
550 struct iucv_sock *iucv;
551
552 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
553 if (!sk)
554 return NULL;
555 iucv = iucv_sk(sk);
556
557 sock_init_data(sock, sk);
558 INIT_LIST_HEAD(&iucv->accept_q);
559 spin_lock_init(&iucv->accept_q_lock);
560 skb_queue_head_init(&iucv->send_skb_q);
561 INIT_LIST_HEAD(&iucv->message_q.list);
562 spin_lock_init(&iucv->message_q.lock);
563 skb_queue_head_init(&iucv->backlog_skb_q);
564 iucv->send_tag = 0;
565 atomic_set(&iucv->pendings, 0);
566 iucv->flags = 0;
567 iucv->msglimit = 0;
568 atomic_set(&iucv->msg_sent, 0);
569 atomic_set(&iucv->msg_recv, 0);
570 iucv->path = NULL;
571 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
572 memset(&iucv->src_user_id , 0, 32);
573 if (pr_iucv)
574 iucv->transport = AF_IUCV_TRANS_IUCV;
575 else
576 iucv->transport = AF_IUCV_TRANS_HIPER;
577
578 sk->sk_destruct = iucv_sock_destruct;
579 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
580 sk->sk_allocation = GFP_DMA;
581
582 sock_reset_flag(sk, SOCK_ZAPPED);
583
584 sk->sk_protocol = proto;
585 sk->sk_state = IUCV_OPEN;
586
587 iucv_sock_link(&iucv_sk_list, sk);
588 return sk;
589 }
590
591 /* Create an IUCV socket */
592 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
593 int kern)
594 {
595 struct sock *sk;
596
597 if (protocol && protocol != PF_IUCV)
598 return -EPROTONOSUPPORT;
599
600 sock->state = SS_UNCONNECTED;
601
602 switch (sock->type) {
603 case SOCK_STREAM:
604 sock->ops = &iucv_sock_ops;
605 break;
606 case SOCK_SEQPACKET:
607 /* currently, proto ops can handle both sk types */
608 sock->ops = &iucv_sock_ops;
609 break;
610 default:
611 return -ESOCKTNOSUPPORT;
612 }
613
614 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
615 if (!sk)
616 return -ENOMEM;
617
618 iucv_sock_init(sk, NULL);
619
620 return 0;
621 }
622
623 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
624 {
625 write_lock_bh(&l->lock);
626 sk_add_node(sk, &l->head);
627 write_unlock_bh(&l->lock);
628 }
629
630 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
631 {
632 write_lock_bh(&l->lock);
633 sk_del_node_init(sk);
634 write_unlock_bh(&l->lock);
635 }
636
637 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
638 {
639 unsigned long flags;
640 struct iucv_sock *par = iucv_sk(parent);
641
642 sock_hold(sk);
643 spin_lock_irqsave(&par->accept_q_lock, flags);
644 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
645 spin_unlock_irqrestore(&par->accept_q_lock, flags);
646 iucv_sk(sk)->parent = parent;
647 sk_acceptq_added(parent);
648 }
649
650 void iucv_accept_unlink(struct sock *sk)
651 {
652 unsigned long flags;
653 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
654
655 spin_lock_irqsave(&par->accept_q_lock, flags);
656 list_del_init(&iucv_sk(sk)->accept_q);
657 spin_unlock_irqrestore(&par->accept_q_lock, flags);
658 sk_acceptq_removed(iucv_sk(sk)->parent);
659 iucv_sk(sk)->parent = NULL;
660 sock_put(sk);
661 }
662
663 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
664 {
665 struct iucv_sock *isk, *n;
666 struct sock *sk;
667
668 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
669 sk = (struct sock *) isk;
670 lock_sock(sk);
671
672 if (sk->sk_state == IUCV_CLOSED) {
673 iucv_accept_unlink(sk);
674 release_sock(sk);
675 continue;
676 }
677
678 if (sk->sk_state == IUCV_CONNECTED ||
679 sk->sk_state == IUCV_DISCONN ||
680 !newsock) {
681 iucv_accept_unlink(sk);
682 if (newsock)
683 sock_graft(sk, newsock);
684
685 release_sock(sk);
686 return sk;
687 }
688
689 release_sock(sk);
690 }
691 return NULL;
692 }
693
694 /* Bind an unbound socket */
695 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
696 int addr_len)
697 {
698 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
699 struct sock *sk = sock->sk;
700 struct iucv_sock *iucv;
701 int err = 0;
702 struct net_device *dev;
703 char uid[9];
704
705 /* Verify the input sockaddr */
706 if (!addr || addr->sa_family != AF_IUCV)
707 return -EINVAL;
708
709 lock_sock(sk);
710 if (sk->sk_state != IUCV_OPEN) {
711 err = -EBADFD;
712 goto done;
713 }
714
715 write_lock_bh(&iucv_sk_list.lock);
716
717 iucv = iucv_sk(sk);
718 if (__iucv_get_sock_by_name(sa->siucv_name)) {
719 err = -EADDRINUSE;
720 goto done_unlock;
721 }
722 if (iucv->path)
723 goto done_unlock;
724
725 /* Bind the socket */
726 if (pr_iucv)
727 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
728 goto vm_bind; /* VM IUCV transport */
729
730 /* try hiper transport */
731 memcpy(uid, sa->siucv_user_id, sizeof(uid));
732 ASCEBC(uid, 8);
733 rcu_read_lock();
734 for_each_netdev_rcu(&init_net, dev) {
735 if (!memcmp(dev->perm_addr, uid, 8)) {
736 memcpy(iucv->src_name, sa->siucv_name, 8);
737 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
738 sk->sk_bound_dev_if = dev->ifindex;
739 iucv->hs_dev = dev;
740 dev_hold(dev);
741 sk->sk_state = IUCV_BOUND;
742 iucv->transport = AF_IUCV_TRANS_HIPER;
743 if (!iucv->msglimit)
744 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
745 rcu_read_unlock();
746 goto done_unlock;
747 }
748 }
749 rcu_read_unlock();
750 vm_bind:
751 if (pr_iucv) {
752 /* use local userid for backward compat */
753 memcpy(iucv->src_name, sa->siucv_name, 8);
754 memcpy(iucv->src_user_id, iucv_userid, 8);
755 sk->sk_state = IUCV_BOUND;
756 iucv->transport = AF_IUCV_TRANS_IUCV;
757 if (!iucv->msglimit)
758 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
759 goto done_unlock;
760 }
761 /* found no dev to bind */
762 err = -ENODEV;
763 done_unlock:
764 /* Release the socket list lock */
765 write_unlock_bh(&iucv_sk_list.lock);
766 done:
767 release_sock(sk);
768 return err;
769 }
770
771 /* Automatically bind an unbound socket */
772 static int iucv_sock_autobind(struct sock *sk)
773 {
774 struct iucv_sock *iucv = iucv_sk(sk);
775 char name[12];
776 int err = 0;
777
778 if (unlikely(!pr_iucv))
779 return -EPROTO;
780
781 memcpy(iucv->src_user_id, iucv_userid, 8);
782
783 write_lock_bh(&iucv_sk_list.lock);
784
785 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
786 while (__iucv_get_sock_by_name(name)) {
787 sprintf(name, "%08x",
788 atomic_inc_return(&iucv_sk_list.autobind_name));
789 }
790
791 write_unlock_bh(&iucv_sk_list.lock);
792
793 memcpy(&iucv->src_name, name, 8);
794
795 if (!iucv->msglimit)
796 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
797
798 return err;
799 }
800
801 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
802 {
803 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
804 struct sock *sk = sock->sk;
805 struct iucv_sock *iucv = iucv_sk(sk);
806 unsigned char user_data[16];
807 int err;
808
809 high_nmcpy(user_data, sa->siucv_name);
810 low_nmcpy(user_data, iucv->src_name);
811 ASCEBC(user_data, sizeof(user_data));
812
813 /* Create path. */
814 iucv->path = iucv_path_alloc(iucv->msglimit,
815 IUCV_IPRMDATA, GFP_KERNEL);
816 if (!iucv->path) {
817 err = -ENOMEM;
818 goto done;
819 }
820 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
821 sa->siucv_user_id, NULL, user_data,
822 sk);
823 if (err) {
824 iucv_path_free(iucv->path);
825 iucv->path = NULL;
826 switch (err) {
827 case 0x0b: /* Target communicator is not logged on */
828 err = -ENETUNREACH;
829 break;
830 case 0x0d: /* Max connections for this guest exceeded */
831 case 0x0e: /* Max connections for target guest exceeded */
832 err = -EAGAIN;
833 break;
834 case 0x0f: /* Missing IUCV authorization */
835 err = -EACCES;
836 break;
837 default:
838 err = -ECONNREFUSED;
839 break;
840 }
841 }
842 done:
843 return err;
844 }
845
846 /* Connect an unconnected socket */
847 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
848 int alen, int flags)
849 {
850 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
851 struct sock *sk = sock->sk;
852 struct iucv_sock *iucv = iucv_sk(sk);
853 int err;
854
855 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
856 return -EINVAL;
857
858 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
859 return -EBADFD;
860
861 if (sk->sk_state == IUCV_OPEN &&
862 iucv->transport == AF_IUCV_TRANS_HIPER)
863 return -EBADFD; /* explicit bind required */
864
865 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
866 return -EINVAL;
867
868 if (sk->sk_state == IUCV_OPEN) {
869 err = iucv_sock_autobind(sk);
870 if (unlikely(err))
871 return err;
872 }
873
874 lock_sock(sk);
875
876 /* Set the destination information */
877 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
878 memcpy(iucv->dst_name, sa->siucv_name, 8);
879
880 if (iucv->transport == AF_IUCV_TRANS_HIPER)
881 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
882 else
883 err = afiucv_path_connect(sock, addr);
884 if (err)
885 goto done;
886
887 if (sk->sk_state != IUCV_CONNECTED)
888 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
889 IUCV_DISCONN),
890 sock_sndtimeo(sk, flags & O_NONBLOCK));
891
892 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
893 err = -ECONNREFUSED;
894
895 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
896 iucv_sever_path(sk, 0);
897
898 done:
899 release_sock(sk);
900 return err;
901 }
902
903 /* Move a socket into listening state. */
904 static int iucv_sock_listen(struct socket *sock, int backlog)
905 {
906 struct sock *sk = sock->sk;
907 int err;
908
909 lock_sock(sk);
910
911 err = -EINVAL;
912 if (sk->sk_state != IUCV_BOUND)
913 goto done;
914
915 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
916 goto done;
917
918 sk->sk_max_ack_backlog = backlog;
919 sk->sk_ack_backlog = 0;
920 sk->sk_state = IUCV_LISTEN;
921 err = 0;
922
923 done:
924 release_sock(sk);
925 return err;
926 }
927
928 /* Accept a pending connection */
929 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
930 int flags)
931 {
932 DECLARE_WAITQUEUE(wait, current);
933 struct sock *sk = sock->sk, *nsk;
934 long timeo;
935 int err = 0;
936
937 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
938
939 if (sk->sk_state != IUCV_LISTEN) {
940 err = -EBADFD;
941 goto done;
942 }
943
944 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
945
946 /* Wait for an incoming connection */
947 add_wait_queue_exclusive(sk_sleep(sk), &wait);
948 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
949 set_current_state(TASK_INTERRUPTIBLE);
950 if (!timeo) {
951 err = -EAGAIN;
952 break;
953 }
954
955 release_sock(sk);
956 timeo = schedule_timeout(timeo);
957 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
958
959 if (sk->sk_state != IUCV_LISTEN) {
960 err = -EBADFD;
961 break;
962 }
963
964 if (signal_pending(current)) {
965 err = sock_intr_errno(timeo);
966 break;
967 }
968 }
969
970 set_current_state(TASK_RUNNING);
971 remove_wait_queue(sk_sleep(sk), &wait);
972
973 if (err)
974 goto done;
975
976 newsock->state = SS_CONNECTED;
977
978 done:
979 release_sock(sk);
980 return err;
981 }
982
983 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
984 int *len, int peer)
985 {
986 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
987 struct sock *sk = sock->sk;
988 struct iucv_sock *iucv = iucv_sk(sk);
989
990 addr->sa_family = AF_IUCV;
991 *len = sizeof(struct sockaddr_iucv);
992
993 if (peer) {
994 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
995 memcpy(siucv->siucv_name, iucv->dst_name, 8);
996 } else {
997 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
998 memcpy(siucv->siucv_name, iucv->src_name, 8);
999 }
1000 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1001 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1002 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1003
1004 return 0;
1005 }
1006
1007 /**
1008 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1009 * @path: IUCV path
1010 * @msg: Pointer to a struct iucv_message
1011 * @skb: The socket data to send, skb->len MUST BE <= 7
1012 *
1013 * Send the socket data in the parameter list in the iucv message
1014 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1015 * list and the socket data len at index 7 (last byte).
1016 * See also iucv_msg_length().
1017 *
1018 * Returns the error code from the iucv_message_send() call.
1019 */
1020 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1021 struct sk_buff *skb)
1022 {
1023 u8 prmdata[8];
1024
1025 memcpy(prmdata, (void *) skb->data, skb->len);
1026 prmdata[7] = 0xff - (u8) skb->len;
1027 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1028 (void *) prmdata, 8);
1029 }
1030
1031 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
1032 struct msghdr *msg, size_t len)
1033 {
1034 struct sock *sk = sock->sk;
1035 struct iucv_sock *iucv = iucv_sk(sk);
1036 struct sk_buff *skb;
1037 struct iucv_message txmsg;
1038 struct cmsghdr *cmsg;
1039 int cmsg_done;
1040 long timeo;
1041 char user_id[9];
1042 char appl_id[9];
1043 int err;
1044 int noblock = msg->msg_flags & MSG_DONTWAIT;
1045
1046 err = sock_error(sk);
1047 if (err)
1048 return err;
1049
1050 if (msg->msg_flags & MSG_OOB)
1051 return -EOPNOTSUPP;
1052
1053 /* SOCK_SEQPACKET: we do not support segmented records */
1054 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1055 return -EOPNOTSUPP;
1056
1057 lock_sock(sk);
1058
1059 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1060 err = -EPIPE;
1061 goto out;
1062 }
1063
1064 /* Return if the socket is not in connected state */
1065 if (sk->sk_state != IUCV_CONNECTED) {
1066 err = -ENOTCONN;
1067 goto out;
1068 }
1069
1070 /* initialize defaults */
1071 cmsg_done = 0; /* check for duplicate headers */
1072 txmsg.class = 0;
1073
1074 /* iterate over control messages */
1075 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
1076 cmsg = CMSG_NXTHDR(msg, cmsg)) {
1077
1078 if (!CMSG_OK(msg, cmsg)) {
1079 err = -EINVAL;
1080 goto out;
1081 }
1082
1083 if (cmsg->cmsg_level != SOL_IUCV)
1084 continue;
1085
1086 if (cmsg->cmsg_type & cmsg_done) {
1087 err = -EINVAL;
1088 goto out;
1089 }
1090 cmsg_done |= cmsg->cmsg_type;
1091
1092 switch (cmsg->cmsg_type) {
1093 case SCM_IUCV_TRGCLS:
1094 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1095 err = -EINVAL;
1096 goto out;
1097 }
1098
1099 /* set iucv message target class */
1100 memcpy(&txmsg.class,
1101 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1102
1103 break;
1104
1105 default:
1106 err = -EINVAL;
1107 goto out;
1108 break;
1109 }
1110 }
1111
1112 /* allocate one skb for each iucv message:
1113 * this is fine for SOCK_SEQPACKET (unless we want to support
1114 * segmented records using the MSG_EOR flag), but
1115 * for SOCK_STREAM we might want to improve it in future */
1116 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1117 skb = sock_alloc_send_skb(sk,
1118 len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN,
1119 noblock, &err);
1120 else
1121 skb = sock_alloc_send_skb(sk, len, noblock, &err);
1122 if (!skb) {
1123 err = -ENOMEM;
1124 goto out;
1125 }
1126 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1127 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1128 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
1129 err = -EFAULT;
1130 goto fail;
1131 }
1132
1133 /* wait if outstanding messages for iucv path has reached */
1134 timeo = sock_sndtimeo(sk, noblock);
1135 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1136 if (err)
1137 goto fail;
1138
1139 /* return -ECONNRESET if the socket is no longer connected */
1140 if (sk->sk_state != IUCV_CONNECTED) {
1141 err = -ECONNRESET;
1142 goto fail;
1143 }
1144
1145 /* increment and save iucv message tag for msg_completion cbk */
1146 txmsg.tag = iucv->send_tag++;
1147 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
1148
1149 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1150 atomic_inc(&iucv->msg_sent);
1151 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1152 if (err) {
1153 atomic_dec(&iucv->msg_sent);
1154 goto fail;
1155 }
1156 goto release;
1157 }
1158 skb_queue_tail(&iucv->send_skb_q, skb);
1159
1160 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1161 && skb->len <= 7) {
1162 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1163
1164 /* on success: there is no message_complete callback
1165 * for an IPRMDATA msg; remove skb from send queue */
1166 if (err == 0) {
1167 skb_unlink(skb, &iucv->send_skb_q);
1168 kfree_skb(skb);
1169 }
1170
1171 /* this error should never happen since the
1172 * IUCV_IPRMDATA path flag is set... sever path */
1173 if (err == 0x15) {
1174 pr_iucv->path_sever(iucv->path, NULL);
1175 skb_unlink(skb, &iucv->send_skb_q);
1176 err = -EPIPE;
1177 goto fail;
1178 }
1179 } else
1180 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1181 (void *) skb->data, skb->len);
1182 if (err) {
1183 if (err == 3) {
1184 user_id[8] = 0;
1185 memcpy(user_id, iucv->dst_user_id, 8);
1186 appl_id[8] = 0;
1187 memcpy(appl_id, iucv->dst_name, 8);
1188 pr_err("Application %s on z/VM guest %s"
1189 " exceeds message limit\n",
1190 appl_id, user_id);
1191 err = -EAGAIN;
1192 } else
1193 err = -EPIPE;
1194 skb_unlink(skb, &iucv->send_skb_q);
1195 goto fail;
1196 }
1197
1198 release:
1199 release_sock(sk);
1200 return len;
1201
1202 fail:
1203 kfree_skb(skb);
1204 out:
1205 release_sock(sk);
1206 return err;
1207 }
1208
1209 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1210 *
1211 * Locking: must be called with message_q.lock held
1212 */
1213 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1214 {
1215 int dataleft, size, copied = 0;
1216 struct sk_buff *nskb;
1217
1218 dataleft = len;
1219 while (dataleft) {
1220 if (dataleft >= sk->sk_rcvbuf / 4)
1221 size = sk->sk_rcvbuf / 4;
1222 else
1223 size = dataleft;
1224
1225 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1226 if (!nskb)
1227 return -ENOMEM;
1228
1229 /* copy target class to control buffer of new skb */
1230 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1231
1232 /* copy data fragment */
1233 memcpy(nskb->data, skb->data + copied, size);
1234 copied += size;
1235 dataleft -= size;
1236
1237 skb_reset_transport_header(nskb);
1238 skb_reset_network_header(nskb);
1239 nskb->len = size;
1240
1241 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1242 }
1243
1244 return 0;
1245 }
1246
1247 /* iucv_process_message() - Receive a single outstanding IUCV message
1248 *
1249 * Locking: must be called with message_q.lock held
1250 */
1251 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1252 struct iucv_path *path,
1253 struct iucv_message *msg)
1254 {
1255 int rc;
1256 unsigned int len;
1257
1258 len = iucv_msg_length(msg);
1259
1260 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1261 /* Note: the first 4 bytes are reserved for msg tag */
1262 memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1263
1264 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1265 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1266 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1267 skb->data = NULL;
1268 skb->len = 0;
1269 }
1270 } else {
1271 rc = pr_iucv->message_receive(path, msg,
1272 msg->flags & IUCV_IPRMDATA,
1273 skb->data, len, NULL);
1274 if (rc) {
1275 kfree_skb(skb);
1276 return;
1277 }
1278 /* we need to fragment iucv messages for SOCK_STREAM only;
1279 * for SOCK_SEQPACKET, it is only relevant if we support
1280 * record segmentation using MSG_EOR (see also recvmsg()) */
1281 if (sk->sk_type == SOCK_STREAM &&
1282 skb->truesize >= sk->sk_rcvbuf / 4) {
1283 rc = iucv_fragment_skb(sk, skb, len);
1284 kfree_skb(skb);
1285 skb = NULL;
1286 if (rc) {
1287 pr_iucv->path_sever(path, NULL);
1288 return;
1289 }
1290 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1291 } else {
1292 skb_reset_transport_header(skb);
1293 skb_reset_network_header(skb);
1294 skb->len = len;
1295 }
1296 }
1297
1298 if (sock_queue_rcv_skb(sk, skb))
1299 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1300 }
1301
1302 /* iucv_process_message_q() - Process outstanding IUCV messages
1303 *
1304 * Locking: must be called with message_q.lock held
1305 */
1306 static void iucv_process_message_q(struct sock *sk)
1307 {
1308 struct iucv_sock *iucv = iucv_sk(sk);
1309 struct sk_buff *skb;
1310 struct sock_msg_q *p, *n;
1311
1312 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1313 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1314 if (!skb)
1315 break;
1316 iucv_process_message(sk, skb, p->path, &p->msg);
1317 list_del(&p->list);
1318 kfree(p);
1319 if (!skb_queue_empty(&iucv->backlog_skb_q))
1320 break;
1321 }
1322 }
1323
1324 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1325 struct msghdr *msg, size_t len, int flags)
1326 {
1327 int noblock = flags & MSG_DONTWAIT;
1328 struct sock *sk = sock->sk;
1329 struct iucv_sock *iucv = iucv_sk(sk);
1330 unsigned int copied, rlen;
1331 struct sk_buff *skb, *rskb, *cskb;
1332 int err = 0;
1333
1334 if ((sk->sk_state == IUCV_DISCONN) &&
1335 skb_queue_empty(&iucv->backlog_skb_q) &&
1336 skb_queue_empty(&sk->sk_receive_queue) &&
1337 list_empty(&iucv->message_q.list))
1338 return 0;
1339
1340 if (flags & (MSG_OOB))
1341 return -EOPNOTSUPP;
1342
1343 /* receive/dequeue next skb:
1344 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1345 skb = skb_recv_datagram(sk, flags, noblock, &err);
1346 if (!skb) {
1347 if (sk->sk_shutdown & RCV_SHUTDOWN)
1348 return 0;
1349 return err;
1350 }
1351
1352 rlen = skb->len; /* real length of skb */
1353 copied = min_t(unsigned int, rlen, len);
1354 if (!rlen)
1355 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1356
1357 cskb = skb;
1358 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
1359 if (!(flags & MSG_PEEK))
1360 skb_queue_head(&sk->sk_receive_queue, skb);
1361 return -EFAULT;
1362 }
1363
1364 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1365 if (sk->sk_type == SOCK_SEQPACKET) {
1366 if (copied < rlen)
1367 msg->msg_flags |= MSG_TRUNC;
1368 /* each iucv message contains a complete record */
1369 msg->msg_flags |= MSG_EOR;
1370 }
1371
1372 /* create control message to store iucv msg target class:
1373 * get the trgcls from the control buffer of the skb due to
1374 * fragmentation of original iucv message. */
1375 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1376 CB_TRGCLS_LEN, CB_TRGCLS(skb));
1377 if (err) {
1378 if (!(flags & MSG_PEEK))
1379 skb_queue_head(&sk->sk_receive_queue, skb);
1380 return err;
1381 }
1382
1383 /* Mark read part of skb as used */
1384 if (!(flags & MSG_PEEK)) {
1385
1386 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1387 if (sk->sk_type == SOCK_STREAM) {
1388 skb_pull(skb, copied);
1389 if (skb->len) {
1390 skb_queue_head(&sk->sk_receive_queue, skb);
1391 goto done;
1392 }
1393 }
1394
1395 kfree_skb(skb);
1396 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1397 atomic_inc(&iucv->msg_recv);
1398 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1399 WARN_ON(1);
1400 iucv_sock_close(sk);
1401 return -EFAULT;
1402 }
1403 }
1404
1405 /* Queue backlog skbs */
1406 spin_lock_bh(&iucv->message_q.lock);
1407 rskb = skb_dequeue(&iucv->backlog_skb_q);
1408 while (rskb) {
1409 if (sock_queue_rcv_skb(sk, rskb)) {
1410 skb_queue_head(&iucv->backlog_skb_q,
1411 rskb);
1412 break;
1413 } else {
1414 rskb = skb_dequeue(&iucv->backlog_skb_q);
1415 }
1416 }
1417 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1418 if (!list_empty(&iucv->message_q.list))
1419 iucv_process_message_q(sk);
1420 if (atomic_read(&iucv->msg_recv) >=
1421 iucv->msglimit / 2) {
1422 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1423 if (err) {
1424 sk->sk_state = IUCV_DISCONN;
1425 sk->sk_state_change(sk);
1426 }
1427 }
1428 }
1429 spin_unlock_bh(&iucv->message_q.lock);
1430 }
1431
1432 done:
1433 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1434 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1435 copied = rlen;
1436
1437 return copied;
1438 }
1439
1440 static inline unsigned int iucv_accept_poll(struct sock *parent)
1441 {
1442 struct iucv_sock *isk, *n;
1443 struct sock *sk;
1444
1445 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1446 sk = (struct sock *) isk;
1447
1448 if (sk->sk_state == IUCV_CONNECTED)
1449 return POLLIN | POLLRDNORM;
1450 }
1451
1452 return 0;
1453 }
1454
1455 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1456 poll_table *wait)
1457 {
1458 struct sock *sk = sock->sk;
1459 unsigned int mask = 0;
1460
1461 sock_poll_wait(file, sk_sleep(sk), wait);
1462
1463 if (sk->sk_state == IUCV_LISTEN)
1464 return iucv_accept_poll(sk);
1465
1466 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1467 mask |= POLLERR;
1468
1469 if (sk->sk_shutdown & RCV_SHUTDOWN)
1470 mask |= POLLRDHUP;
1471
1472 if (sk->sk_shutdown == SHUTDOWN_MASK)
1473 mask |= POLLHUP;
1474
1475 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1476 (sk->sk_shutdown & RCV_SHUTDOWN))
1477 mask |= POLLIN | POLLRDNORM;
1478
1479 if (sk->sk_state == IUCV_CLOSED)
1480 mask |= POLLHUP;
1481
1482 if (sk->sk_state == IUCV_DISCONN)
1483 mask |= POLLIN;
1484
1485 if (sock_writeable(sk) && iucv_below_msglim(sk))
1486 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1487 else
1488 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1489
1490 return mask;
1491 }
1492
1493 static int iucv_sock_shutdown(struct socket *sock, int how)
1494 {
1495 struct sock *sk = sock->sk;
1496 struct iucv_sock *iucv = iucv_sk(sk);
1497 struct iucv_message txmsg;
1498 int err = 0;
1499
1500 how++;
1501
1502 if ((how & ~SHUTDOWN_MASK) || !how)
1503 return -EINVAL;
1504
1505 lock_sock(sk);
1506 switch (sk->sk_state) {
1507 case IUCV_LISTEN:
1508 case IUCV_DISCONN:
1509 case IUCV_CLOSING:
1510 case IUCV_CLOSED:
1511 err = -ENOTCONN;
1512 goto fail;
1513 default:
1514 break;
1515 }
1516
1517 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1518 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1519 txmsg.class = 0;
1520 txmsg.tag = 0;
1521 err = pr_iucv->message_send(iucv->path, &txmsg,
1522 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1523 if (err) {
1524 switch (err) {
1525 case 1:
1526 err = -ENOTCONN;
1527 break;
1528 case 2:
1529 err = -ECONNRESET;
1530 break;
1531 default:
1532 err = -ENOTCONN;
1533 break;
1534 }
1535 }
1536 } else
1537 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1538 }
1539
1540 sk->sk_shutdown |= how;
1541 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1542 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1543 err = pr_iucv->path_quiesce(iucv->path, NULL);
1544 if (err)
1545 err = -ENOTCONN;
1546 /* skb_queue_purge(&sk->sk_receive_queue); */
1547 }
1548 skb_queue_purge(&sk->sk_receive_queue);
1549 }
1550
1551 /* Wake up anyone sleeping in poll */
1552 sk->sk_state_change(sk);
1553
1554 fail:
1555 release_sock(sk);
1556 return err;
1557 }
1558
1559 static int iucv_sock_release(struct socket *sock)
1560 {
1561 struct sock *sk = sock->sk;
1562 int err = 0;
1563
1564 if (!sk)
1565 return 0;
1566
1567 iucv_sock_close(sk);
1568
1569 sock_orphan(sk);
1570 iucv_sock_kill(sk);
1571 return err;
1572 }
1573
1574 /* getsockopt and setsockopt */
1575 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1576 char __user *optval, unsigned int optlen)
1577 {
1578 struct sock *sk = sock->sk;
1579 struct iucv_sock *iucv = iucv_sk(sk);
1580 int val;
1581 int rc;
1582
1583 if (level != SOL_IUCV)
1584 return -ENOPROTOOPT;
1585
1586 if (optlen < sizeof(int))
1587 return -EINVAL;
1588
1589 if (get_user(val, (int __user *) optval))
1590 return -EFAULT;
1591
1592 rc = 0;
1593
1594 lock_sock(sk);
1595 switch (optname) {
1596 case SO_IPRMDATA_MSG:
1597 if (val)
1598 iucv->flags |= IUCV_IPRMDATA;
1599 else
1600 iucv->flags &= ~IUCV_IPRMDATA;
1601 break;
1602 case SO_MSGLIMIT:
1603 switch (sk->sk_state) {
1604 case IUCV_OPEN:
1605 case IUCV_BOUND:
1606 if (val < 1 || val > (u16)(~0))
1607 rc = -EINVAL;
1608 else
1609 iucv->msglimit = val;
1610 break;
1611 default:
1612 rc = -EINVAL;
1613 break;
1614 }
1615 break;
1616 default:
1617 rc = -ENOPROTOOPT;
1618 break;
1619 }
1620 release_sock(sk);
1621
1622 return rc;
1623 }
1624
1625 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1626 char __user *optval, int __user *optlen)
1627 {
1628 struct sock *sk = sock->sk;
1629 struct iucv_sock *iucv = iucv_sk(sk);
1630 unsigned int val;
1631 int len;
1632
1633 if (level != SOL_IUCV)
1634 return -ENOPROTOOPT;
1635
1636 if (get_user(len, optlen))
1637 return -EFAULT;
1638
1639 if (len < 0)
1640 return -EINVAL;
1641
1642 len = min_t(unsigned int, len, sizeof(int));
1643
1644 switch (optname) {
1645 case SO_IPRMDATA_MSG:
1646 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1647 break;
1648 case SO_MSGLIMIT:
1649 lock_sock(sk);
1650 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1651 : iucv->msglimit; /* default */
1652 release_sock(sk);
1653 break;
1654 case SO_MSGSIZE:
1655 if (sk->sk_state == IUCV_OPEN)
1656 return -EBADFD;
1657 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1658 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1659 0x7fffffff;
1660 break;
1661 default:
1662 return -ENOPROTOOPT;
1663 }
1664
1665 if (put_user(len, optlen))
1666 return -EFAULT;
1667 if (copy_to_user(optval, &val, len))
1668 return -EFAULT;
1669
1670 return 0;
1671 }
1672
1673
1674 /* Callback wrappers - called from iucv base support */
1675 static int iucv_callback_connreq(struct iucv_path *path,
1676 u8 ipvmid[8], u8 ipuser[16])
1677 {
1678 unsigned char user_data[16];
1679 unsigned char nuser_data[16];
1680 unsigned char src_name[8];
1681 struct hlist_node *node;
1682 struct sock *sk, *nsk;
1683 struct iucv_sock *iucv, *niucv;
1684 int err;
1685
1686 memcpy(src_name, ipuser, 8);
1687 EBCASC(src_name, 8);
1688 /* Find out if this path belongs to af_iucv. */
1689 read_lock(&iucv_sk_list.lock);
1690 iucv = NULL;
1691 sk = NULL;
1692 sk_for_each(sk, node, &iucv_sk_list.head)
1693 if (sk->sk_state == IUCV_LISTEN &&
1694 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1695 /*
1696 * Found a listening socket with
1697 * src_name == ipuser[0-7].
1698 */
1699 iucv = iucv_sk(sk);
1700 break;
1701 }
1702 read_unlock(&iucv_sk_list.lock);
1703 if (!iucv)
1704 /* No socket found, not one of our paths. */
1705 return -EINVAL;
1706
1707 bh_lock_sock(sk);
1708
1709 /* Check if parent socket is listening */
1710 low_nmcpy(user_data, iucv->src_name);
1711 high_nmcpy(user_data, iucv->dst_name);
1712 ASCEBC(user_data, sizeof(user_data));
1713 if (sk->sk_state != IUCV_LISTEN) {
1714 err = pr_iucv->path_sever(path, user_data);
1715 iucv_path_free(path);
1716 goto fail;
1717 }
1718
1719 /* Check for backlog size */
1720 if (sk_acceptq_is_full(sk)) {
1721 err = pr_iucv->path_sever(path, user_data);
1722 iucv_path_free(path);
1723 goto fail;
1724 }
1725
1726 /* Create the new socket */
1727 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1728 if (!nsk) {
1729 err = pr_iucv->path_sever(path, user_data);
1730 iucv_path_free(path);
1731 goto fail;
1732 }
1733
1734 niucv = iucv_sk(nsk);
1735 iucv_sock_init(nsk, sk);
1736
1737 /* Set the new iucv_sock */
1738 memcpy(niucv->dst_name, ipuser + 8, 8);
1739 EBCASC(niucv->dst_name, 8);
1740 memcpy(niucv->dst_user_id, ipvmid, 8);
1741 memcpy(niucv->src_name, iucv->src_name, 8);
1742 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1743 niucv->path = path;
1744
1745 /* Call iucv_accept */
1746 high_nmcpy(nuser_data, ipuser + 8);
1747 memcpy(nuser_data + 8, niucv->src_name, 8);
1748 ASCEBC(nuser_data + 8, 8);
1749
1750 /* set message limit for path based on msglimit of accepting socket */
1751 niucv->msglimit = iucv->msglimit;
1752 path->msglim = iucv->msglimit;
1753 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1754 if (err) {
1755 iucv_sever_path(nsk, 1);
1756 iucv_sock_kill(nsk);
1757 goto fail;
1758 }
1759
1760 iucv_accept_enqueue(sk, nsk);
1761
1762 /* Wake up accept */
1763 nsk->sk_state = IUCV_CONNECTED;
1764 sk->sk_data_ready(sk, 1);
1765 err = 0;
1766 fail:
1767 bh_unlock_sock(sk);
1768 return 0;
1769 }
1770
1771 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1772 {
1773 struct sock *sk = path->private;
1774
1775 sk->sk_state = IUCV_CONNECTED;
1776 sk->sk_state_change(sk);
1777 }
1778
1779 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1780 {
1781 struct sock *sk = path->private;
1782 struct iucv_sock *iucv = iucv_sk(sk);
1783 struct sk_buff *skb;
1784 struct sock_msg_q *save_msg;
1785 int len;
1786
1787 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1788 pr_iucv->message_reject(path, msg);
1789 return;
1790 }
1791
1792 spin_lock(&iucv->message_q.lock);
1793
1794 if (!list_empty(&iucv->message_q.list) ||
1795 !skb_queue_empty(&iucv->backlog_skb_q))
1796 goto save_message;
1797
1798 len = atomic_read(&sk->sk_rmem_alloc);
1799 len += SKB_TRUESIZE(iucv_msg_length(msg));
1800 if (len > sk->sk_rcvbuf)
1801 goto save_message;
1802
1803 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1804 if (!skb)
1805 goto save_message;
1806
1807 iucv_process_message(sk, skb, path, msg);
1808 goto out_unlock;
1809
1810 save_message:
1811 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1812 if (!save_msg)
1813 goto out_unlock;
1814 save_msg->path = path;
1815 save_msg->msg = *msg;
1816
1817 list_add_tail(&save_msg->list, &iucv->message_q.list);
1818
1819 out_unlock:
1820 spin_unlock(&iucv->message_q.lock);
1821 }
1822
1823 static void iucv_callback_txdone(struct iucv_path *path,
1824 struct iucv_message *msg)
1825 {
1826 struct sock *sk = path->private;
1827 struct sk_buff *this = NULL;
1828 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1829 struct sk_buff *list_skb = list->next;
1830 unsigned long flags;
1831
1832 bh_lock_sock(sk);
1833 if (!skb_queue_empty(list)) {
1834 spin_lock_irqsave(&list->lock, flags);
1835
1836 while (list_skb != (struct sk_buff *)list) {
1837 if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1838 this = list_skb;
1839 break;
1840 }
1841 list_skb = list_skb->next;
1842 }
1843 if (this)
1844 __skb_unlink(this, list);
1845
1846 spin_unlock_irqrestore(&list->lock, flags);
1847
1848 if (this) {
1849 kfree_skb(this);
1850 /* wake up any process waiting for sending */
1851 iucv_sock_wake_msglim(sk);
1852 }
1853 }
1854
1855 if (sk->sk_state == IUCV_CLOSING) {
1856 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1857 sk->sk_state = IUCV_CLOSED;
1858 sk->sk_state_change(sk);
1859 }
1860 }
1861 bh_unlock_sock(sk);
1862
1863 }
1864
1865 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1866 {
1867 struct sock *sk = path->private;
1868
1869 if (sk->sk_state == IUCV_CLOSED)
1870 return;
1871
1872 bh_lock_sock(sk);
1873 iucv_sever_path(sk, 1);
1874 sk->sk_state = IUCV_DISCONN;
1875
1876 sk->sk_state_change(sk);
1877 bh_unlock_sock(sk);
1878 }
1879
1880 /* called if the other communication side shuts down its RECV direction;
1881 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1882 */
1883 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1884 {
1885 struct sock *sk = path->private;
1886
1887 bh_lock_sock(sk);
1888 if (sk->sk_state != IUCV_CLOSED) {
1889 sk->sk_shutdown |= SEND_SHUTDOWN;
1890 sk->sk_state_change(sk);
1891 }
1892 bh_unlock_sock(sk);
1893 }
1894
1895 /***************** HiperSockets transport callbacks ********************/
1896 static void afiucv_swap_src_dest(struct sk_buff *skb)
1897 {
1898 struct af_iucv_trans_hdr *trans_hdr =
1899 (struct af_iucv_trans_hdr *)skb->data;
1900 char tmpID[8];
1901 char tmpName[8];
1902
1903 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1904 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1905 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1906 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1907 memcpy(tmpID, trans_hdr->srcUserID, 8);
1908 memcpy(tmpName, trans_hdr->srcAppName, 8);
1909 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1910 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1911 memcpy(trans_hdr->destUserID, tmpID, 8);
1912 memcpy(trans_hdr->destAppName, tmpName, 8);
1913 skb_push(skb, ETH_HLEN);
1914 memset(skb->data, 0, ETH_HLEN);
1915 }
1916
1917 /**
1918 * afiucv_hs_callback_syn - react on received SYN
1919 **/
1920 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1921 {
1922 struct sock *nsk;
1923 struct iucv_sock *iucv, *niucv;
1924 struct af_iucv_trans_hdr *trans_hdr;
1925 int err;
1926
1927 iucv = iucv_sk(sk);
1928 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1929 if (!iucv) {
1930 /* no sock - connection refused */
1931 afiucv_swap_src_dest(skb);
1932 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1933 err = dev_queue_xmit(skb);
1934 goto out;
1935 }
1936
1937 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1938 bh_lock_sock(sk);
1939 if ((sk->sk_state != IUCV_LISTEN) ||
1940 sk_acceptq_is_full(sk) ||
1941 !nsk) {
1942 /* error on server socket - connection refused */
1943 if (nsk)
1944 sk_free(nsk);
1945 afiucv_swap_src_dest(skb);
1946 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1947 err = dev_queue_xmit(skb);
1948 bh_unlock_sock(sk);
1949 goto out;
1950 }
1951
1952 niucv = iucv_sk(nsk);
1953 iucv_sock_init(nsk, sk);
1954 niucv->transport = AF_IUCV_TRANS_HIPER;
1955 niucv->msglimit = iucv->msglimit;
1956 if (!trans_hdr->window)
1957 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1958 else
1959 niucv->msglimit_peer = trans_hdr->window;
1960 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1961 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1962 memcpy(niucv->src_name, iucv->src_name, 8);
1963 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1964 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1965 niucv->hs_dev = iucv->hs_dev;
1966 dev_hold(niucv->hs_dev);
1967 afiucv_swap_src_dest(skb);
1968 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1969 trans_hdr->window = niucv->msglimit;
1970 /* if receiver acks the xmit connection is established */
1971 err = dev_queue_xmit(skb);
1972 if (!err) {
1973 iucv_accept_enqueue(sk, nsk);
1974 nsk->sk_state = IUCV_CONNECTED;
1975 sk->sk_data_ready(sk, 1);
1976 } else
1977 iucv_sock_kill(nsk);
1978 bh_unlock_sock(sk);
1979
1980 out:
1981 return NET_RX_SUCCESS;
1982 }
1983
1984 /**
1985 * afiucv_hs_callback_synack() - react on received SYN-ACK
1986 **/
1987 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1988 {
1989 struct iucv_sock *iucv = iucv_sk(sk);
1990 struct af_iucv_trans_hdr *trans_hdr =
1991 (struct af_iucv_trans_hdr *)skb->data;
1992
1993 if (!iucv)
1994 goto out;
1995 if (sk->sk_state != IUCV_BOUND)
1996 goto out;
1997 bh_lock_sock(sk);
1998 iucv->msglimit_peer = trans_hdr->window;
1999 sk->sk_state = IUCV_CONNECTED;
2000 sk->sk_state_change(sk);
2001 bh_unlock_sock(sk);
2002 out:
2003 kfree_skb(skb);
2004 return NET_RX_SUCCESS;
2005 }
2006
2007 /**
2008 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2009 **/
2010 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2011 {
2012 struct iucv_sock *iucv = iucv_sk(sk);
2013
2014 if (!iucv)
2015 goto out;
2016 if (sk->sk_state != IUCV_BOUND)
2017 goto out;
2018 bh_lock_sock(sk);
2019 sk->sk_state = IUCV_DISCONN;
2020 sk->sk_state_change(sk);
2021 bh_unlock_sock(sk);
2022 out:
2023 kfree_skb(skb);
2024 return NET_RX_SUCCESS;
2025 }
2026
2027 /**
2028 * afiucv_hs_callback_fin() - react on received FIN
2029 **/
2030 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2031 {
2032 struct iucv_sock *iucv = iucv_sk(sk);
2033
2034 /* other end of connection closed */
2035 if (!iucv)
2036 goto out;
2037 bh_lock_sock(sk);
2038 if (sk->sk_state == IUCV_CONNECTED) {
2039 sk->sk_state = IUCV_DISCONN;
2040 sk->sk_state_change(sk);
2041 }
2042 bh_unlock_sock(sk);
2043 out:
2044 kfree_skb(skb);
2045 return NET_RX_SUCCESS;
2046 }
2047
2048 /**
2049 * afiucv_hs_callback_win() - react on received WIN
2050 **/
2051 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2052 {
2053 struct iucv_sock *iucv = iucv_sk(sk);
2054 struct af_iucv_trans_hdr *trans_hdr =
2055 (struct af_iucv_trans_hdr *)skb->data;
2056
2057 if (!iucv)
2058 return NET_RX_SUCCESS;
2059
2060 if (sk->sk_state != IUCV_CONNECTED)
2061 return NET_RX_SUCCESS;
2062
2063 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2064 iucv_sock_wake_msglim(sk);
2065 return NET_RX_SUCCESS;
2066 }
2067
2068 /**
2069 * afiucv_hs_callback_rx() - react on received data
2070 **/
2071 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2072 {
2073 struct iucv_sock *iucv = iucv_sk(sk);
2074
2075 if (!iucv) {
2076 kfree_skb(skb);
2077 return NET_RX_SUCCESS;
2078 }
2079
2080 if (sk->sk_state != IUCV_CONNECTED) {
2081 kfree_skb(skb);
2082 return NET_RX_SUCCESS;
2083 }
2084
2085 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2086 kfree_skb(skb);
2087 return NET_RX_SUCCESS;
2088 }
2089
2090 /* write stuff from iucv_msg to skb cb */
2091 if (skb->len < sizeof(struct af_iucv_trans_hdr)) {
2092 kfree_skb(skb);
2093 return NET_RX_SUCCESS;
2094 }
2095 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2096 skb_reset_transport_header(skb);
2097 skb_reset_network_header(skb);
2098 spin_lock(&iucv->message_q.lock);
2099 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2100 if (sock_queue_rcv_skb(sk, skb)) {
2101 /* handle rcv queue full */
2102 skb_queue_tail(&iucv->backlog_skb_q, skb);
2103 }
2104 } else
2105 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2106 spin_unlock(&iucv->message_q.lock);
2107 return NET_RX_SUCCESS;
2108 }
2109
2110 /**
2111 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2112 * transport
2113 * called from netif RX softirq
2114 **/
2115 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2116 struct packet_type *pt, struct net_device *orig_dev)
2117 {
2118 struct hlist_node *node;
2119 struct sock *sk;
2120 struct iucv_sock *iucv;
2121 struct af_iucv_trans_hdr *trans_hdr;
2122 char nullstring[8];
2123 int err = 0;
2124
2125 skb_pull(skb, ETH_HLEN);
2126 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2127 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2128 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2129 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2130 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2131 memset(nullstring, 0, sizeof(nullstring));
2132 iucv = NULL;
2133 sk = NULL;
2134 read_lock(&iucv_sk_list.lock);
2135 sk_for_each(sk, node, &iucv_sk_list.head) {
2136 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2137 if ((!memcmp(&iucv_sk(sk)->src_name,
2138 trans_hdr->destAppName, 8)) &&
2139 (!memcmp(&iucv_sk(sk)->src_user_id,
2140 trans_hdr->destUserID, 8)) &&
2141 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2142 (!memcmp(&iucv_sk(sk)->dst_user_id,
2143 nullstring, 8))) {
2144 iucv = iucv_sk(sk);
2145 break;
2146 }
2147 } else {
2148 if ((!memcmp(&iucv_sk(sk)->src_name,
2149 trans_hdr->destAppName, 8)) &&
2150 (!memcmp(&iucv_sk(sk)->src_user_id,
2151 trans_hdr->destUserID, 8)) &&
2152 (!memcmp(&iucv_sk(sk)->dst_name,
2153 trans_hdr->srcAppName, 8)) &&
2154 (!memcmp(&iucv_sk(sk)->dst_user_id,
2155 trans_hdr->srcUserID, 8))) {
2156 iucv = iucv_sk(sk);
2157 break;
2158 }
2159 }
2160 }
2161 read_unlock(&iucv_sk_list.lock);
2162 if (!iucv)
2163 sk = NULL;
2164
2165 /* no sock
2166 how should we send with no sock
2167 1) send without sock no send rc checking?
2168 2) introduce default sock to handle this cases
2169
2170 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2171 data -> send FIN
2172 SYN|ACK, SYN|FIN, FIN -> no action? */
2173
2174 switch (trans_hdr->flags) {
2175 case AF_IUCV_FLAG_SYN:
2176 /* connect request */
2177 err = afiucv_hs_callback_syn(sk, skb);
2178 break;
2179 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2180 /* connect request confirmed */
2181 err = afiucv_hs_callback_synack(sk, skb);
2182 break;
2183 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2184 /* connect request refused */
2185 err = afiucv_hs_callback_synfin(sk, skb);
2186 break;
2187 case (AF_IUCV_FLAG_FIN):
2188 /* close request */
2189 err = afiucv_hs_callback_fin(sk, skb);
2190 break;
2191 case (AF_IUCV_FLAG_WIN):
2192 err = afiucv_hs_callback_win(sk, skb);
2193 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2194 kfree_skb(skb);
2195 break;
2196 }
2197 /* fall through and receive non-zero length data */
2198 case (AF_IUCV_FLAG_SHT):
2199 /* shutdown request */
2200 /* fall through and receive zero length data */
2201 case 0:
2202 /* plain data frame */
2203 memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class,
2204 CB_TRGCLS_LEN);
2205 err = afiucv_hs_callback_rx(sk, skb);
2206 break;
2207 default:
2208 ;
2209 }
2210
2211 return err;
2212 }
2213
2214 /**
2215 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2216 * transport
2217 **/
2218 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2219 enum iucv_tx_notify n)
2220 {
2221 struct sock *isk = skb->sk;
2222 struct sock *sk = NULL;
2223 struct iucv_sock *iucv = NULL;
2224 struct sk_buff_head *list;
2225 struct sk_buff *list_skb;
2226 struct sk_buff *nskb;
2227 unsigned long flags;
2228 struct hlist_node *node;
2229
2230 read_lock_irqsave(&iucv_sk_list.lock, flags);
2231 sk_for_each(sk, node, &iucv_sk_list.head)
2232 if (sk == isk) {
2233 iucv = iucv_sk(sk);
2234 break;
2235 }
2236 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2237
2238 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2239 return;
2240
2241 list = &iucv->send_skb_q;
2242 spin_lock_irqsave(&list->lock, flags);
2243 if (skb_queue_empty(list))
2244 goto out_unlock;
2245 list_skb = list->next;
2246 nskb = list_skb->next;
2247 while (list_skb != (struct sk_buff *)list) {
2248 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2249 switch (n) {
2250 case TX_NOTIFY_OK:
2251 __skb_unlink(list_skb, list);
2252 kfree_skb(list_skb);
2253 iucv_sock_wake_msglim(sk);
2254 break;
2255 case TX_NOTIFY_PENDING:
2256 atomic_inc(&iucv->pendings);
2257 break;
2258 case TX_NOTIFY_DELAYED_OK:
2259 __skb_unlink(list_skb, list);
2260 atomic_dec(&iucv->pendings);
2261 if (atomic_read(&iucv->pendings) <= 0)
2262 iucv_sock_wake_msglim(sk);
2263 kfree_skb(list_skb);
2264 break;
2265 case TX_NOTIFY_UNREACHABLE:
2266 case TX_NOTIFY_DELAYED_UNREACHABLE:
2267 case TX_NOTIFY_TPQFULL: /* not yet used */
2268 case TX_NOTIFY_GENERALERROR:
2269 case TX_NOTIFY_DELAYED_GENERALERROR:
2270 __skb_unlink(list_skb, list);
2271 kfree_skb(list_skb);
2272 if (sk->sk_state == IUCV_CONNECTED) {
2273 sk->sk_state = IUCV_DISCONN;
2274 sk->sk_state_change(sk);
2275 }
2276 break;
2277 }
2278 break;
2279 }
2280 list_skb = nskb;
2281 nskb = nskb->next;
2282 }
2283 out_unlock:
2284 spin_unlock_irqrestore(&list->lock, flags);
2285
2286 if (sk->sk_state == IUCV_CLOSING) {
2287 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2288 sk->sk_state = IUCV_CLOSED;
2289 sk->sk_state_change(sk);
2290 }
2291 }
2292
2293 }
2294
2295 /*
2296 * afiucv_netdev_event: handle netdev notifier chain events
2297 */
2298 static int afiucv_netdev_event(struct notifier_block *this,
2299 unsigned long event, void *ptr)
2300 {
2301 struct net_device *event_dev = (struct net_device *)ptr;
2302 struct hlist_node *node;
2303 struct sock *sk;
2304 struct iucv_sock *iucv;
2305
2306 switch (event) {
2307 case NETDEV_REBOOT:
2308 case NETDEV_GOING_DOWN:
2309 sk_for_each(sk, node, &iucv_sk_list.head) {
2310 iucv = iucv_sk(sk);
2311 if ((iucv->hs_dev == event_dev) &&
2312 (sk->sk_state == IUCV_CONNECTED)) {
2313 if (event == NETDEV_GOING_DOWN)
2314 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2315 sk->sk_state = IUCV_DISCONN;
2316 sk->sk_state_change(sk);
2317 }
2318 }
2319 break;
2320 case NETDEV_DOWN:
2321 case NETDEV_UNREGISTER:
2322 default:
2323 break;
2324 }
2325 return NOTIFY_DONE;
2326 }
2327
2328 static struct notifier_block afiucv_netdev_notifier = {
2329 .notifier_call = afiucv_netdev_event,
2330 };
2331
2332 static const struct proto_ops iucv_sock_ops = {
2333 .family = PF_IUCV,
2334 .owner = THIS_MODULE,
2335 .release = iucv_sock_release,
2336 .bind = iucv_sock_bind,
2337 .connect = iucv_sock_connect,
2338 .listen = iucv_sock_listen,
2339 .accept = iucv_sock_accept,
2340 .getname = iucv_sock_getname,
2341 .sendmsg = iucv_sock_sendmsg,
2342 .recvmsg = iucv_sock_recvmsg,
2343 .poll = iucv_sock_poll,
2344 .ioctl = sock_no_ioctl,
2345 .mmap = sock_no_mmap,
2346 .socketpair = sock_no_socketpair,
2347 .shutdown = iucv_sock_shutdown,
2348 .setsockopt = iucv_sock_setsockopt,
2349 .getsockopt = iucv_sock_getsockopt,
2350 };
2351
2352 static const struct net_proto_family iucv_sock_family_ops = {
2353 .family = AF_IUCV,
2354 .owner = THIS_MODULE,
2355 .create = iucv_sock_create,
2356 };
2357
2358 static struct packet_type iucv_packet_type = {
2359 .type = cpu_to_be16(ETH_P_AF_IUCV),
2360 .func = afiucv_hs_rcv,
2361 };
2362
2363 static int afiucv_iucv_init(void)
2364 {
2365 int err;
2366
2367 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2368 if (err)
2369 goto out;
2370 /* establish dummy device */
2371 af_iucv_driver.bus = pr_iucv->bus;
2372 err = driver_register(&af_iucv_driver);
2373 if (err)
2374 goto out_iucv;
2375 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2376 if (!af_iucv_dev) {
2377 err = -ENOMEM;
2378 goto out_driver;
2379 }
2380 dev_set_name(af_iucv_dev, "af_iucv");
2381 af_iucv_dev->bus = pr_iucv->bus;
2382 af_iucv_dev->parent = pr_iucv->root;
2383 af_iucv_dev->release = (void (*)(struct device *))kfree;
2384 af_iucv_dev->driver = &af_iucv_driver;
2385 err = device_register(af_iucv_dev);
2386 if (err)
2387 goto out_driver;
2388 return 0;
2389
2390 out_driver:
2391 driver_unregister(&af_iucv_driver);
2392 out_iucv:
2393 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2394 out:
2395 return err;
2396 }
2397
2398 static int __init afiucv_init(void)
2399 {
2400 int err;
2401
2402 if (MACHINE_IS_VM) {
2403 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2404 if (unlikely(err)) {
2405 WARN_ON(err);
2406 err = -EPROTONOSUPPORT;
2407 goto out;
2408 }
2409
2410 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2411 if (!pr_iucv) {
2412 printk(KERN_WARNING "iucv_if lookup failed\n");
2413 memset(&iucv_userid, 0, sizeof(iucv_userid));
2414 }
2415 } else {
2416 memset(&iucv_userid, 0, sizeof(iucv_userid));
2417 pr_iucv = NULL;
2418 }
2419
2420 err = proto_register(&iucv_proto, 0);
2421 if (err)
2422 goto out;
2423 err = sock_register(&iucv_sock_family_ops);
2424 if (err)
2425 goto out_proto;
2426
2427 if (pr_iucv) {
2428 err = afiucv_iucv_init();
2429 if (err)
2430 goto out_sock;
2431 } else
2432 register_netdevice_notifier(&afiucv_netdev_notifier);
2433 dev_add_pack(&iucv_packet_type);
2434 return 0;
2435
2436 out_sock:
2437 sock_unregister(PF_IUCV);
2438 out_proto:
2439 proto_unregister(&iucv_proto);
2440 out:
2441 if (pr_iucv)
2442 symbol_put(iucv_if);
2443 return err;
2444 }
2445
2446 static void __exit afiucv_exit(void)
2447 {
2448 if (pr_iucv) {
2449 device_unregister(af_iucv_dev);
2450 driver_unregister(&af_iucv_driver);
2451 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2452 symbol_put(iucv_if);
2453 } else
2454 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2455 dev_remove_pack(&iucv_packet_type);
2456 sock_unregister(PF_IUCV);
2457 proto_unregister(&iucv_proto);
2458 }
2459
2460 module_init(afiucv_init);
2461 module_exit(afiucv_exit);
2462
2463 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2464 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2465 MODULE_VERSION(VERSION);
2466 MODULE_LICENSE("GPL");
2467 MODULE_ALIAS_NETPROTO(PF_IUCV);
2468
Linux with added FPC-III support