]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/iucv/af_iucv.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'keys-misc-20160708' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
[mirror_ubuntu-artful-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 <linux/security.h>
26 #include <net/sock.h>
27 #include <asm/ebcdic.h>
28 #include <asm/cpcmd.h>
29 #include <linux/kmod.h>
30
31 #include <net/iucv/af_iucv.h>
32
33 #define VERSION "1.2"
34
35 static char iucv_userid[80];
36
37 static const struct proto_ops iucv_sock_ops;
38
39 static struct proto iucv_proto = {
40 .name = "AF_IUCV",
41 .owner = THIS_MODULE,
42 .obj_size = sizeof(struct iucv_sock),
43 };
44
45 static struct iucv_interface *pr_iucv;
46
47 /* special AF_IUCV IPRM messages */
48 static const u8 iprm_shutdown[8] =
49 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
50
51 #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class))
52
53 #define __iucv_sock_wait(sk, condition, timeo, ret) \
54 do { \
55 DEFINE_WAIT(__wait); \
56 long __timeo = timeo; \
57 ret = 0; \
58 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
59 while (!(condition)) { \
60 if (!__timeo) { \
61 ret = -EAGAIN; \
62 break; \
63 } \
64 if (signal_pending(current)) { \
65 ret = sock_intr_errno(__timeo); \
66 break; \
67 } \
68 release_sock(sk); \
69 __timeo = schedule_timeout(__timeo); \
70 lock_sock(sk); \
71 ret = sock_error(sk); \
72 if (ret) \
73 break; \
74 } \
75 finish_wait(sk_sleep(sk), &__wait); \
76 } while (0)
77
78 #define iucv_sock_wait(sk, condition, timeo) \
79 ({ \
80 int __ret = 0; \
81 if (!(condition)) \
82 __iucv_sock_wait(sk, condition, timeo, __ret); \
83 __ret; \
84 })
85
86 static void iucv_sock_kill(struct sock *sk);
87 static void iucv_sock_close(struct sock *sk);
88 static void iucv_sever_path(struct sock *, int);
89
90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
91 struct packet_type *pt, struct net_device *orig_dev);
92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
93 struct sk_buff *skb, u8 flags);
94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
95
96 /* Call Back functions */
97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
99 static void iucv_callback_connack(struct iucv_path *, u8 *);
100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
103
104 static struct iucv_sock_list iucv_sk_list = {
105 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106 .autobind_name = ATOMIC_INIT(0)
107 };
108
109 static struct iucv_handler af_iucv_handler = {
110 .path_pending = iucv_callback_connreq,
111 .path_complete = iucv_callback_connack,
112 .path_severed = iucv_callback_connrej,
113 .message_pending = iucv_callback_rx,
114 .message_complete = iucv_callback_txdone,
115 .path_quiesced = iucv_callback_shutdown,
116 };
117
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120 memcpy(dst, src, 8);
121 }
122
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125 memcpy(&dst[8], src, 8);
126 }
127
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131 printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133 return 0;
134 }
135
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139 printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142
143 /**
144 * afiucv_pm_freeze() - Freeze PM callback
145 * @dev: AFIUCV dummy device
146 *
147 * Sever all established IUCV communication pathes
148 */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151 struct iucv_sock *iucv;
152 struct sock *sk;
153 int err = 0;
154
155 #ifdef CONFIG_PM_DEBUG
156 printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158 read_lock(&iucv_sk_list.lock);
159 sk_for_each(sk, &iucv_sk_list.head) {
160 iucv = iucv_sk(sk);
161 switch (sk->sk_state) {
162 case IUCV_DISCONN:
163 case IUCV_CLOSING:
164 case IUCV_CONNECTED:
165 iucv_sever_path(sk, 0);
166 break;
167 case IUCV_OPEN:
168 case IUCV_BOUND:
169 case IUCV_LISTEN:
170 case IUCV_CLOSED:
171 default:
172 break;
173 }
174 skb_queue_purge(&iucv->send_skb_q);
175 skb_queue_purge(&iucv->backlog_skb_q);
176 }
177 read_unlock(&iucv_sk_list.lock);
178 return err;
179 }
180
181 /**
182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183 * @dev: AFIUCV dummy device
184 *
185 * socket clean up after freeze
186 */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189 struct sock *sk;
190
191 #ifdef CONFIG_PM_DEBUG
192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194 read_lock(&iucv_sk_list.lock);
195 sk_for_each(sk, &iucv_sk_list.head) {
196 switch (sk->sk_state) {
197 case IUCV_CONNECTED:
198 sk->sk_err = EPIPE;
199 sk->sk_state = IUCV_DISCONN;
200 sk->sk_state_change(sk);
201 break;
202 case IUCV_DISCONN:
203 case IUCV_CLOSING:
204 case IUCV_LISTEN:
205 case IUCV_BOUND:
206 case IUCV_OPEN:
207 default:
208 break;
209 }
210 }
211 read_unlock(&iucv_sk_list.lock);
212 return 0;
213 }
214
215 static const struct dev_pm_ops afiucv_pm_ops = {
216 .prepare = afiucv_pm_prepare,
217 .complete = afiucv_pm_complete,
218 .freeze = afiucv_pm_freeze,
219 .thaw = afiucv_pm_restore_thaw,
220 .restore = afiucv_pm_restore_thaw,
221 };
222
223 static struct device_driver af_iucv_driver = {
224 .owner = THIS_MODULE,
225 .name = "afiucv",
226 .bus = NULL,
227 .pm = &afiucv_pm_ops,
228 };
229
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232
233 /**
234 * iucv_msg_length() - Returns the length of an iucv message.
235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
236 *
237 * The function returns the length of the specified iucv message @msg of data
238 * stored in a buffer and of data stored in the parameter list (PRMDATA).
239 *
240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241 * data:
242 * PRMDATA[0..6] socket data (max 7 bytes);
243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
244 *
245 * The socket data length is computed by subtracting the socket data length
246 * value from 0xFF.
247 * If the socket data len is greater 7, then PRMDATA can be used for special
248 * notifications (see iucv_sock_shutdown); and further,
249 * if the socket data len is > 7, the function returns 8.
250 *
251 * Use this function to allocate socket buffers to store iucv message data.
252 */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255 size_t datalen;
256
257 if (msg->flags & IUCV_IPRMDATA) {
258 datalen = 0xff - msg->rmmsg[7];
259 return (datalen < 8) ? datalen : 8;
260 }
261 return msg->length;
262 }
263
264 /**
265 * iucv_sock_in_state() - check for specific states
266 * @sk: sock structure
267 * @state: first iucv sk state
268 * @state: second iucv sk state
269 *
270 * Returns true if the socket in either in the first or second state.
271 */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274 return (sk->sk_state == state || sk->sk_state == state2);
275 }
276
277 /**
278 * iucv_below_msglim() - function to check if messages can be sent
279 * @sk: sock structure
280 *
281 * Returns true if the send queue length is lower than the message limit.
282 * Always returns true if the socket is not connected (no iucv path for
283 * checking the message limit).
284 */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287 struct iucv_sock *iucv = iucv_sk(sk);
288
289 if (sk->sk_state != IUCV_CONNECTED)
290 return 1;
291 if (iucv->transport == AF_IUCV_TRANS_IUCV)
292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293 else
294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295 (atomic_read(&iucv->pendings) <= 0));
296 }
297
298 /**
299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300 */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303 struct socket_wq *wq;
304
305 rcu_read_lock();
306 wq = rcu_dereference(sk->sk_wq);
307 if (skwq_has_sleeper(wq))
308 wake_up_interruptible_all(&wq->wait);
309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310 rcu_read_unlock();
311 }
312
313 /**
314 * afiucv_hs_send() - send a message through HiperSockets transport
315 */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317 struct sk_buff *skb, u8 flags)
318 {
319 struct iucv_sock *iucv = iucv_sk(sock);
320 struct af_iucv_trans_hdr *phs_hdr;
321 struct sk_buff *nskb;
322 int err, confirm_recv = 0;
323
324 memset(skb->head, 0, ETH_HLEN);
325 phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb,
326 sizeof(struct af_iucv_trans_hdr));
327 skb_reset_mac_header(skb);
328 skb_reset_network_header(skb);
329 skb_push(skb, ETH_HLEN);
330 skb_reset_mac_header(skb);
331 memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
332
333 phs_hdr->magic = ETH_P_AF_IUCV;
334 phs_hdr->version = 1;
335 phs_hdr->flags = flags;
336 if (flags == AF_IUCV_FLAG_SYN)
337 phs_hdr->window = iucv->msglimit;
338 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
339 confirm_recv = atomic_read(&iucv->msg_recv);
340 phs_hdr->window = confirm_recv;
341 if (confirm_recv)
342 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
343 }
344 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
345 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
346 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
347 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
348 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
349 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
350 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
351 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
352 if (imsg)
353 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
354
355 skb->dev = iucv->hs_dev;
356 if (!skb->dev)
357 return -ENODEV;
358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
359 return -ENETDOWN;
360 if (skb->len > skb->dev->mtu) {
361 if (sock->sk_type == SOCK_SEQPACKET)
362 return -EMSGSIZE;
363 else
364 skb_trim(skb, skb->dev->mtu);
365 }
366 skb->protocol = ETH_P_AF_IUCV;
367 nskb = skb_clone(skb, GFP_ATOMIC);
368 if (!nskb)
369 return -ENOMEM;
370 skb_queue_tail(&iucv->send_skb_q, nskb);
371 err = dev_queue_xmit(skb);
372 if (net_xmit_eval(err)) {
373 skb_unlink(nskb, &iucv->send_skb_q);
374 kfree_skb(nskb);
375 } else {
376 atomic_sub(confirm_recv, &iucv->msg_recv);
377 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
378 }
379 return net_xmit_eval(err);
380 }
381
382 static struct sock *__iucv_get_sock_by_name(char *nm)
383 {
384 struct sock *sk;
385
386 sk_for_each(sk, &iucv_sk_list.head)
387 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
388 return sk;
389
390 return NULL;
391 }
392
393 static void iucv_sock_destruct(struct sock *sk)
394 {
395 skb_queue_purge(&sk->sk_receive_queue);
396 skb_queue_purge(&sk->sk_error_queue);
397
398 sk_mem_reclaim(sk);
399
400 if (!sock_flag(sk, SOCK_DEAD)) {
401 pr_err("Attempt to release alive iucv socket %p\n", sk);
402 return;
403 }
404
405 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
406 WARN_ON(atomic_read(&sk->sk_wmem_alloc));
407 WARN_ON(sk->sk_wmem_queued);
408 WARN_ON(sk->sk_forward_alloc);
409 }
410
411 /* Cleanup Listen */
412 static void iucv_sock_cleanup_listen(struct sock *parent)
413 {
414 struct sock *sk;
415
416 /* Close non-accepted connections */
417 while ((sk = iucv_accept_dequeue(parent, NULL))) {
418 iucv_sock_close(sk);
419 iucv_sock_kill(sk);
420 }
421
422 parent->sk_state = IUCV_CLOSED;
423 }
424
425 /* Kill socket (only if zapped and orphaned) */
426 static void iucv_sock_kill(struct sock *sk)
427 {
428 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
429 return;
430
431 iucv_sock_unlink(&iucv_sk_list, sk);
432 sock_set_flag(sk, SOCK_DEAD);
433 sock_put(sk);
434 }
435
436 /* Terminate an IUCV path */
437 static void iucv_sever_path(struct sock *sk, int with_user_data)
438 {
439 unsigned char user_data[16];
440 struct iucv_sock *iucv = iucv_sk(sk);
441 struct iucv_path *path = iucv->path;
442
443 if (iucv->path) {
444 iucv->path = NULL;
445 if (with_user_data) {
446 low_nmcpy(user_data, iucv->src_name);
447 high_nmcpy(user_data, iucv->dst_name);
448 ASCEBC(user_data, sizeof(user_data));
449 pr_iucv->path_sever(path, user_data);
450 } else
451 pr_iucv->path_sever(path, NULL);
452 iucv_path_free(path);
453 }
454 }
455
456 /* Send FIN through an IUCV socket for HIPER transport */
457 static int iucv_send_ctrl(struct sock *sk, u8 flags)
458 {
459 int err = 0;
460 int blen;
461 struct sk_buff *skb;
462
463 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464 skb = sock_alloc_send_skb(sk, blen, 1, &err);
465 if (skb) {
466 skb_reserve(skb, blen);
467 err = afiucv_hs_send(NULL, sk, skb, flags);
468 }
469 return err;
470 }
471
472 /* Close an IUCV socket */
473 static void iucv_sock_close(struct sock *sk)
474 {
475 struct iucv_sock *iucv = iucv_sk(sk);
476 unsigned long timeo;
477 int err = 0;
478
479 lock_sock(sk);
480
481 switch (sk->sk_state) {
482 case IUCV_LISTEN:
483 iucv_sock_cleanup_listen(sk);
484 break;
485
486 case IUCV_CONNECTED:
487 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
488 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
489 sk->sk_state = IUCV_DISCONN;
490 sk->sk_state_change(sk);
491 }
492 case IUCV_DISCONN: /* fall through */
493 sk->sk_state = IUCV_CLOSING;
494 sk->sk_state_change(sk);
495
496 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
497 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
498 timeo = sk->sk_lingertime;
499 else
500 timeo = IUCV_DISCONN_TIMEOUT;
501 iucv_sock_wait(sk,
502 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
503 timeo);
504 }
505
506 case IUCV_CLOSING: /* fall through */
507 sk->sk_state = IUCV_CLOSED;
508 sk->sk_state_change(sk);
509
510 sk->sk_err = ECONNRESET;
511 sk->sk_state_change(sk);
512
513 skb_queue_purge(&iucv->send_skb_q);
514 skb_queue_purge(&iucv->backlog_skb_q);
515
516 default: /* fall through */
517 iucv_sever_path(sk, 1);
518 }
519
520 if (iucv->hs_dev) {
521 dev_put(iucv->hs_dev);
522 iucv->hs_dev = NULL;
523 sk->sk_bound_dev_if = 0;
524 }
525
526 /* mark socket for deletion by iucv_sock_kill() */
527 sock_set_flag(sk, SOCK_ZAPPED);
528
529 release_sock(sk);
530 }
531
532 static void iucv_sock_init(struct sock *sk, struct sock *parent)
533 {
534 if (parent) {
535 sk->sk_type = parent->sk_type;
536 security_sk_clone(parent, sk);
537 }
538 }
539
540 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
541 {
542 struct sock *sk;
543 struct iucv_sock *iucv;
544
545 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
546 if (!sk)
547 return NULL;
548 iucv = iucv_sk(sk);
549
550 sock_init_data(sock, sk);
551 INIT_LIST_HEAD(&iucv->accept_q);
552 spin_lock_init(&iucv->accept_q_lock);
553 skb_queue_head_init(&iucv->send_skb_q);
554 INIT_LIST_HEAD(&iucv->message_q.list);
555 spin_lock_init(&iucv->message_q.lock);
556 skb_queue_head_init(&iucv->backlog_skb_q);
557 iucv->send_tag = 0;
558 atomic_set(&iucv->pendings, 0);
559 iucv->flags = 0;
560 iucv->msglimit = 0;
561 atomic_set(&iucv->msg_sent, 0);
562 atomic_set(&iucv->msg_recv, 0);
563 iucv->path = NULL;
564 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
565 memset(&iucv->src_user_id , 0, 32);
566 if (pr_iucv)
567 iucv->transport = AF_IUCV_TRANS_IUCV;
568 else
569 iucv->transport = AF_IUCV_TRANS_HIPER;
570
571 sk->sk_destruct = iucv_sock_destruct;
572 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
573 sk->sk_allocation = GFP_DMA;
574
575 sock_reset_flag(sk, SOCK_ZAPPED);
576
577 sk->sk_protocol = proto;
578 sk->sk_state = IUCV_OPEN;
579
580 iucv_sock_link(&iucv_sk_list, sk);
581 return sk;
582 }
583
584 /* Create an IUCV socket */
585 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
586 int kern)
587 {
588 struct sock *sk;
589
590 if (protocol && protocol != PF_IUCV)
591 return -EPROTONOSUPPORT;
592
593 sock->state = SS_UNCONNECTED;
594
595 switch (sock->type) {
596 case SOCK_STREAM:
597 sock->ops = &iucv_sock_ops;
598 break;
599 case SOCK_SEQPACKET:
600 /* currently, proto ops can handle both sk types */
601 sock->ops = &iucv_sock_ops;
602 break;
603 default:
604 return -ESOCKTNOSUPPORT;
605 }
606
607 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
608 if (!sk)
609 return -ENOMEM;
610
611 iucv_sock_init(sk, NULL);
612
613 return 0;
614 }
615
616 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
617 {
618 write_lock_bh(&l->lock);
619 sk_add_node(sk, &l->head);
620 write_unlock_bh(&l->lock);
621 }
622
623 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
624 {
625 write_lock_bh(&l->lock);
626 sk_del_node_init(sk);
627 write_unlock_bh(&l->lock);
628 }
629
630 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
631 {
632 unsigned long flags;
633 struct iucv_sock *par = iucv_sk(parent);
634
635 sock_hold(sk);
636 spin_lock_irqsave(&par->accept_q_lock, flags);
637 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
638 spin_unlock_irqrestore(&par->accept_q_lock, flags);
639 iucv_sk(sk)->parent = parent;
640 sk_acceptq_added(parent);
641 }
642
643 void iucv_accept_unlink(struct sock *sk)
644 {
645 unsigned long flags;
646 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
647
648 spin_lock_irqsave(&par->accept_q_lock, flags);
649 list_del_init(&iucv_sk(sk)->accept_q);
650 spin_unlock_irqrestore(&par->accept_q_lock, flags);
651 sk_acceptq_removed(iucv_sk(sk)->parent);
652 iucv_sk(sk)->parent = NULL;
653 sock_put(sk);
654 }
655
656 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
657 {
658 struct iucv_sock *isk, *n;
659 struct sock *sk;
660
661 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
662 sk = (struct sock *) isk;
663 lock_sock(sk);
664
665 if (sk->sk_state == IUCV_CLOSED) {
666 iucv_accept_unlink(sk);
667 release_sock(sk);
668 continue;
669 }
670
671 if (sk->sk_state == IUCV_CONNECTED ||
672 sk->sk_state == IUCV_DISCONN ||
673 !newsock) {
674 iucv_accept_unlink(sk);
675 if (newsock)
676 sock_graft(sk, newsock);
677
678 release_sock(sk);
679 return sk;
680 }
681
682 release_sock(sk);
683 }
684 return NULL;
685 }
686
687 static void __iucv_auto_name(struct iucv_sock *iucv)
688 {
689 char name[12];
690
691 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
692 while (__iucv_get_sock_by_name(name)) {
693 sprintf(name, "%08x",
694 atomic_inc_return(&iucv_sk_list.autobind_name));
695 }
696 memcpy(iucv->src_name, name, 8);
697 }
698
699 /* Bind an unbound socket */
700 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
701 int addr_len)
702 {
703 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
704 struct sock *sk = sock->sk;
705 struct iucv_sock *iucv;
706 int err = 0;
707 struct net_device *dev;
708 char uid[9];
709
710 /* Verify the input sockaddr */
711 if (!addr || addr->sa_family != AF_IUCV)
712 return -EINVAL;
713
714 if (addr_len < sizeof(struct sockaddr_iucv))
715 return -EINVAL;
716
717 lock_sock(sk);
718 if (sk->sk_state != IUCV_OPEN) {
719 err = -EBADFD;
720 goto done;
721 }
722
723 write_lock_bh(&iucv_sk_list.lock);
724
725 iucv = iucv_sk(sk);
726 if (__iucv_get_sock_by_name(sa->siucv_name)) {
727 err = -EADDRINUSE;
728 goto done_unlock;
729 }
730 if (iucv->path)
731 goto done_unlock;
732
733 /* Bind the socket */
734 if (pr_iucv)
735 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
736 goto vm_bind; /* VM IUCV transport */
737
738 /* try hiper transport */
739 memcpy(uid, sa->siucv_user_id, sizeof(uid));
740 ASCEBC(uid, 8);
741 rcu_read_lock();
742 for_each_netdev_rcu(&init_net, dev) {
743 if (!memcmp(dev->perm_addr, uid, 8)) {
744 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
745 /* Check for unitialized siucv_name */
746 if (strncmp(sa->siucv_name, " ", 8) == 0)
747 __iucv_auto_name(iucv);
748 else
749 memcpy(iucv->src_name, sa->siucv_name, 8);
750 sk->sk_bound_dev_if = dev->ifindex;
751 iucv->hs_dev = dev;
752 dev_hold(dev);
753 sk->sk_state = IUCV_BOUND;
754 iucv->transport = AF_IUCV_TRANS_HIPER;
755 if (!iucv->msglimit)
756 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
757 rcu_read_unlock();
758 goto done_unlock;
759 }
760 }
761 rcu_read_unlock();
762 vm_bind:
763 if (pr_iucv) {
764 /* use local userid for backward compat */
765 memcpy(iucv->src_name, sa->siucv_name, 8);
766 memcpy(iucv->src_user_id, iucv_userid, 8);
767 sk->sk_state = IUCV_BOUND;
768 iucv->transport = AF_IUCV_TRANS_IUCV;
769 if (!iucv->msglimit)
770 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
771 goto done_unlock;
772 }
773 /* found no dev to bind */
774 err = -ENODEV;
775 done_unlock:
776 /* Release the socket list lock */
777 write_unlock_bh(&iucv_sk_list.lock);
778 done:
779 release_sock(sk);
780 return err;
781 }
782
783 /* Automatically bind an unbound socket */
784 static int iucv_sock_autobind(struct sock *sk)
785 {
786 struct iucv_sock *iucv = iucv_sk(sk);
787 int err = 0;
788
789 if (unlikely(!pr_iucv))
790 return -EPROTO;
791
792 memcpy(iucv->src_user_id, iucv_userid, 8);
793
794 write_lock_bh(&iucv_sk_list.lock);
795 __iucv_auto_name(iucv);
796 write_unlock_bh(&iucv_sk_list.lock);
797
798 if (!iucv->msglimit)
799 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
800
801 return err;
802 }
803
804 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
805 {
806 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
807 struct sock *sk = sock->sk;
808 struct iucv_sock *iucv = iucv_sk(sk);
809 unsigned char user_data[16];
810 int err;
811
812 high_nmcpy(user_data, sa->siucv_name);
813 low_nmcpy(user_data, iucv->src_name);
814 ASCEBC(user_data, sizeof(user_data));
815
816 /* Create path. */
817 iucv->path = iucv_path_alloc(iucv->msglimit,
818 IUCV_IPRMDATA, GFP_KERNEL);
819 if (!iucv->path) {
820 err = -ENOMEM;
821 goto done;
822 }
823 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
824 sa->siucv_user_id, NULL, user_data,
825 sk);
826 if (err) {
827 iucv_path_free(iucv->path);
828 iucv->path = NULL;
829 switch (err) {
830 case 0x0b: /* Target communicator is not logged on */
831 err = -ENETUNREACH;
832 break;
833 case 0x0d: /* Max connections for this guest exceeded */
834 case 0x0e: /* Max connections for target guest exceeded */
835 err = -EAGAIN;
836 break;
837 case 0x0f: /* Missing IUCV authorization */
838 err = -EACCES;
839 break;
840 default:
841 err = -ECONNREFUSED;
842 break;
843 }
844 }
845 done:
846 return err;
847 }
848
849 /* Connect an unconnected socket */
850 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
851 int alen, int flags)
852 {
853 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
854 struct sock *sk = sock->sk;
855 struct iucv_sock *iucv = iucv_sk(sk);
856 int err;
857
858 if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
859 return -EINVAL;
860
861 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
862 return -EBADFD;
863
864 if (sk->sk_state == IUCV_OPEN &&
865 iucv->transport == AF_IUCV_TRANS_HIPER)
866 return -EBADFD; /* explicit bind required */
867
868 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
869 return -EINVAL;
870
871 if (sk->sk_state == IUCV_OPEN) {
872 err = iucv_sock_autobind(sk);
873 if (unlikely(err))
874 return err;
875 }
876
877 lock_sock(sk);
878
879 /* Set the destination information */
880 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
881 memcpy(iucv->dst_name, sa->siucv_name, 8);
882
883 if (iucv->transport == AF_IUCV_TRANS_HIPER)
884 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
885 else
886 err = afiucv_path_connect(sock, addr);
887 if (err)
888 goto done;
889
890 if (sk->sk_state != IUCV_CONNECTED)
891 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
892 IUCV_DISCONN),
893 sock_sndtimeo(sk, flags & O_NONBLOCK));
894
895 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
896 err = -ECONNREFUSED;
897
898 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
899 iucv_sever_path(sk, 0);
900
901 done:
902 release_sock(sk);
903 return err;
904 }
905
906 /* Move a socket into listening state. */
907 static int iucv_sock_listen(struct socket *sock, int backlog)
908 {
909 struct sock *sk = sock->sk;
910 int err;
911
912 lock_sock(sk);
913
914 err = -EINVAL;
915 if (sk->sk_state != IUCV_BOUND)
916 goto done;
917
918 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
919 goto done;
920
921 sk->sk_max_ack_backlog = backlog;
922 sk->sk_ack_backlog = 0;
923 sk->sk_state = IUCV_LISTEN;
924 err = 0;
925
926 done:
927 release_sock(sk);
928 return err;
929 }
930
931 /* Accept a pending connection */
932 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
933 int flags)
934 {
935 DECLARE_WAITQUEUE(wait, current);
936 struct sock *sk = sock->sk, *nsk;
937 long timeo;
938 int err = 0;
939
940 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
941
942 if (sk->sk_state != IUCV_LISTEN) {
943 err = -EBADFD;
944 goto done;
945 }
946
947 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
948
949 /* Wait for an incoming connection */
950 add_wait_queue_exclusive(sk_sleep(sk), &wait);
951 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
952 set_current_state(TASK_INTERRUPTIBLE);
953 if (!timeo) {
954 err = -EAGAIN;
955 break;
956 }
957
958 release_sock(sk);
959 timeo = schedule_timeout(timeo);
960 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
961
962 if (sk->sk_state != IUCV_LISTEN) {
963 err = -EBADFD;
964 break;
965 }
966
967 if (signal_pending(current)) {
968 err = sock_intr_errno(timeo);
969 break;
970 }
971 }
972
973 set_current_state(TASK_RUNNING);
974 remove_wait_queue(sk_sleep(sk), &wait);
975
976 if (err)
977 goto done;
978
979 newsock->state = SS_CONNECTED;
980
981 done:
982 release_sock(sk);
983 return err;
984 }
985
986 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
987 int *len, int peer)
988 {
989 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
990 struct sock *sk = sock->sk;
991 struct iucv_sock *iucv = iucv_sk(sk);
992
993 addr->sa_family = AF_IUCV;
994 *len = sizeof(struct sockaddr_iucv);
995
996 if (peer) {
997 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
998 memcpy(siucv->siucv_name, iucv->dst_name, 8);
999 } else {
1000 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1001 memcpy(siucv->siucv_name, iucv->src_name, 8);
1002 }
1003 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1004 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1005 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1006
1007 return 0;
1008 }
1009
1010 /**
1011 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1012 * @path: IUCV path
1013 * @msg: Pointer to a struct iucv_message
1014 * @skb: The socket data to send, skb->len MUST BE <= 7
1015 *
1016 * Send the socket data in the parameter list in the iucv message
1017 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1018 * list and the socket data len at index 7 (last byte).
1019 * See also iucv_msg_length().
1020 *
1021 * Returns the error code from the iucv_message_send() call.
1022 */
1023 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1024 struct sk_buff *skb)
1025 {
1026 u8 prmdata[8];
1027
1028 memcpy(prmdata, (void *) skb->data, skb->len);
1029 prmdata[7] = 0xff - (u8) skb->len;
1030 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1031 (void *) prmdata, 8);
1032 }
1033
1034 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1035 size_t len)
1036 {
1037 struct sock *sk = sock->sk;
1038 struct iucv_sock *iucv = iucv_sk(sk);
1039 struct sk_buff *skb;
1040 struct iucv_message txmsg = {0};
1041 struct cmsghdr *cmsg;
1042 int cmsg_done;
1043 long timeo;
1044 char user_id[9];
1045 char appl_id[9];
1046 int err;
1047 int noblock = msg->msg_flags & MSG_DONTWAIT;
1048
1049 err = sock_error(sk);
1050 if (err)
1051 return err;
1052
1053 if (msg->msg_flags & MSG_OOB)
1054 return -EOPNOTSUPP;
1055
1056 /* SOCK_SEQPACKET: we do not support segmented records */
1057 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1058 return -EOPNOTSUPP;
1059
1060 lock_sock(sk);
1061
1062 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1063 err = -EPIPE;
1064 goto out;
1065 }
1066
1067 /* Return if the socket is not in connected state */
1068 if (sk->sk_state != IUCV_CONNECTED) {
1069 err = -ENOTCONN;
1070 goto out;
1071 }
1072
1073 /* initialize defaults */
1074 cmsg_done = 0; /* check for duplicate headers */
1075 txmsg.class = 0;
1076
1077 /* iterate over control messages */
1078 for_each_cmsghdr(cmsg, msg) {
1079 if (!CMSG_OK(msg, cmsg)) {
1080 err = -EINVAL;
1081 goto out;
1082 }
1083
1084 if (cmsg->cmsg_level != SOL_IUCV)
1085 continue;
1086
1087 if (cmsg->cmsg_type & cmsg_done) {
1088 err = -EINVAL;
1089 goto out;
1090 }
1091 cmsg_done |= cmsg->cmsg_type;
1092
1093 switch (cmsg->cmsg_type) {
1094 case SCM_IUCV_TRGCLS:
1095 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1096 err = -EINVAL;
1097 goto out;
1098 }
1099
1100 /* set iucv message target class */
1101 memcpy(&txmsg.class,
1102 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1103
1104 break;
1105
1106 default:
1107 err = -EINVAL;
1108 goto out;
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 goto out;
1124 if (iucv->transport == AF_IUCV_TRANS_HIPER)
1125 skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN);
1126 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
1127 err = -EFAULT;
1128 goto fail;
1129 }
1130
1131 /* wait if outstanding messages for iucv path has reached */
1132 timeo = sock_sndtimeo(sk, noblock);
1133 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1134 if (err)
1135 goto fail;
1136
1137 /* return -ECONNRESET if the socket is no longer connected */
1138 if (sk->sk_state != IUCV_CONNECTED) {
1139 err = -ECONNRESET;
1140 goto fail;
1141 }
1142
1143 /* increment and save iucv message tag for msg_completion cbk */
1144 txmsg.tag = iucv->send_tag++;
1145 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1146
1147 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1148 atomic_inc(&iucv->msg_sent);
1149 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1150 if (err) {
1151 atomic_dec(&iucv->msg_sent);
1152 goto fail;
1153 }
1154 goto release;
1155 }
1156 skb_queue_tail(&iucv->send_skb_q, skb);
1157
1158 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
1159 && skb->len <= 7) {
1160 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1161
1162 /* on success: there is no message_complete callback
1163 * for an IPRMDATA msg; remove skb from send queue */
1164 if (err == 0) {
1165 skb_unlink(skb, &iucv->send_skb_q);
1166 kfree_skb(skb);
1167 }
1168
1169 /* this error should never happen since the
1170 * IUCV_IPRMDATA path flag is set... sever path */
1171 if (err == 0x15) {
1172 pr_iucv->path_sever(iucv->path, NULL);
1173 skb_unlink(skb, &iucv->send_skb_q);
1174 err = -EPIPE;
1175 goto fail;
1176 }
1177 } else
1178 err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0,
1179 (void *) skb->data, skb->len);
1180 if (err) {
1181 if (err == 3) {
1182 user_id[8] = 0;
1183 memcpy(user_id, iucv->dst_user_id, 8);
1184 appl_id[8] = 0;
1185 memcpy(appl_id, iucv->dst_name, 8);
1186 pr_err("Application %s on z/VM guest %s"
1187 " exceeds message limit\n",
1188 appl_id, user_id);
1189 err = -EAGAIN;
1190 } else
1191 err = -EPIPE;
1192 skb_unlink(skb, &iucv->send_skb_q);
1193 goto fail;
1194 }
1195
1196 release:
1197 release_sock(sk);
1198 return len;
1199
1200 fail:
1201 kfree_skb(skb);
1202 out:
1203 release_sock(sk);
1204 return err;
1205 }
1206
1207 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1208 *
1209 * Locking: must be called with message_q.lock held
1210 */
1211 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1212 {
1213 int dataleft, size, copied = 0;
1214 struct sk_buff *nskb;
1215
1216 dataleft = len;
1217 while (dataleft) {
1218 if (dataleft >= sk->sk_rcvbuf / 4)
1219 size = sk->sk_rcvbuf / 4;
1220 else
1221 size = dataleft;
1222
1223 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1224 if (!nskb)
1225 return -ENOMEM;
1226
1227 /* copy target class to control buffer of new skb */
1228 IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class;
1229
1230 /* copy data fragment */
1231 memcpy(nskb->data, skb->data + copied, size);
1232 copied += size;
1233 dataleft -= size;
1234
1235 skb_reset_transport_header(nskb);
1236 skb_reset_network_header(nskb);
1237 nskb->len = size;
1238
1239 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1240 }
1241
1242 return 0;
1243 }
1244
1245 /* iucv_process_message() - Receive a single outstanding IUCV message
1246 *
1247 * Locking: must be called with message_q.lock held
1248 */
1249 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1250 struct iucv_path *path,
1251 struct iucv_message *msg)
1252 {
1253 int rc;
1254 unsigned int len;
1255
1256 len = iucv_msg_length(msg);
1257
1258 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1259 /* Note: the first 4 bytes are reserved for msg tag */
1260 IUCV_SKB_CB(skb)->class = msg->class;
1261
1262 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1263 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1264 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1265 skb->data = NULL;
1266 skb->len = 0;
1267 }
1268 } else {
1269 rc = pr_iucv->message_receive(path, msg,
1270 msg->flags & IUCV_IPRMDATA,
1271 skb->data, len, NULL);
1272 if (rc) {
1273 kfree_skb(skb);
1274 return;
1275 }
1276 /* we need to fragment iucv messages for SOCK_STREAM only;
1277 * for SOCK_SEQPACKET, it is only relevant if we support
1278 * record segmentation using MSG_EOR (see also recvmsg()) */
1279 if (sk->sk_type == SOCK_STREAM &&
1280 skb->truesize >= sk->sk_rcvbuf / 4) {
1281 rc = iucv_fragment_skb(sk, skb, len);
1282 kfree_skb(skb);
1283 skb = NULL;
1284 if (rc) {
1285 pr_iucv->path_sever(path, NULL);
1286 return;
1287 }
1288 skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1289 } else {
1290 skb_reset_transport_header(skb);
1291 skb_reset_network_header(skb);
1292 skb->len = len;
1293 }
1294 }
1295
1296 IUCV_SKB_CB(skb)->offset = 0;
1297 if (sock_queue_rcv_skb(sk, skb))
1298 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1299 }
1300
1301 /* iucv_process_message_q() - Process outstanding IUCV messages
1302 *
1303 * Locking: must be called with message_q.lock held
1304 */
1305 static void iucv_process_message_q(struct sock *sk)
1306 {
1307 struct iucv_sock *iucv = iucv_sk(sk);
1308 struct sk_buff *skb;
1309 struct sock_msg_q *p, *n;
1310
1311 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1312 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1313 if (!skb)
1314 break;
1315 iucv_process_message(sk, skb, p->path, &p->msg);
1316 list_del(&p->list);
1317 kfree(p);
1318 if (!skb_queue_empty(&iucv->backlog_skb_q))
1319 break;
1320 }
1321 }
1322
1323 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1324 size_t len, int flags)
1325 {
1326 int noblock = flags & MSG_DONTWAIT;
1327 struct sock *sk = sock->sk;
1328 struct iucv_sock *iucv = iucv_sk(sk);
1329 unsigned int copied, rlen;
1330 struct sk_buff *skb, *rskb, *cskb;
1331 int err = 0;
1332 u32 offset;
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 offset = IUCV_SKB_CB(skb)->offset;
1353 rlen = skb->len - offset; /* real length of skb */
1354 copied = min_t(unsigned int, rlen, len);
1355 if (!rlen)
1356 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1357
1358 cskb = skb;
1359 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1360 if (!(flags & MSG_PEEK))
1361 skb_queue_head(&sk->sk_receive_queue, skb);
1362 return -EFAULT;
1363 }
1364
1365 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1366 if (sk->sk_type == SOCK_SEQPACKET) {
1367 if (copied < rlen)
1368 msg->msg_flags |= MSG_TRUNC;
1369 /* each iucv message contains a complete record */
1370 msg->msg_flags |= MSG_EOR;
1371 }
1372
1373 /* create control message to store iucv msg target class:
1374 * get the trgcls from the control buffer of the skb due to
1375 * fragmentation of original iucv message. */
1376 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1377 sizeof(IUCV_SKB_CB(skb)->class),
1378 (void *)&IUCV_SKB_CB(skb)->class);
1379 if (err) {
1380 if (!(flags & MSG_PEEK))
1381 skb_queue_head(&sk->sk_receive_queue, skb);
1382 return err;
1383 }
1384
1385 /* Mark read part of skb as used */
1386 if (!(flags & MSG_PEEK)) {
1387
1388 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1389 if (sk->sk_type == SOCK_STREAM) {
1390 if (copied < rlen) {
1391 IUCV_SKB_CB(skb)->offset = offset + copied;
1392 skb_queue_head(&sk->sk_receive_queue, skb);
1393 goto done;
1394 }
1395 }
1396
1397 kfree_skb(skb);
1398 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1399 atomic_inc(&iucv->msg_recv);
1400 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1401 WARN_ON(1);
1402 iucv_sock_close(sk);
1403 return -EFAULT;
1404 }
1405 }
1406
1407 /* Queue backlog skbs */
1408 spin_lock_bh(&iucv->message_q.lock);
1409 rskb = skb_dequeue(&iucv->backlog_skb_q);
1410 while (rskb) {
1411 IUCV_SKB_CB(rskb)->offset = 0;
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 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1426 if (err) {
1427 sk->sk_state = IUCV_DISCONN;
1428 sk->sk_state_change(sk);
1429 }
1430 }
1431 }
1432 spin_unlock_bh(&iucv->message_q.lock);
1433 }
1434
1435 done:
1436 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1437 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1438 copied = rlen;
1439
1440 return copied;
1441 }
1442
1443 static inline unsigned int iucv_accept_poll(struct sock *parent)
1444 {
1445 struct iucv_sock *isk, *n;
1446 struct sock *sk;
1447
1448 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1449 sk = (struct sock *) isk;
1450
1451 if (sk->sk_state == IUCV_CONNECTED)
1452 return POLLIN | POLLRDNORM;
1453 }
1454
1455 return 0;
1456 }
1457
1458 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1459 poll_table *wait)
1460 {
1461 struct sock *sk = sock->sk;
1462 unsigned int mask = 0;
1463
1464 sock_poll_wait(file, sk_sleep(sk), wait);
1465
1466 if (sk->sk_state == IUCV_LISTEN)
1467 return iucv_accept_poll(sk);
1468
1469 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1470 mask |= POLLERR |
1471 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1472
1473 if (sk->sk_shutdown & RCV_SHUTDOWN)
1474 mask |= POLLRDHUP;
1475
1476 if (sk->sk_shutdown == SHUTDOWN_MASK)
1477 mask |= POLLHUP;
1478
1479 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1480 (sk->sk_shutdown & RCV_SHUTDOWN))
1481 mask |= POLLIN | POLLRDNORM;
1482
1483 if (sk->sk_state == IUCV_CLOSED)
1484 mask |= POLLHUP;
1485
1486 if (sk->sk_state == IUCV_DISCONN)
1487 mask |= POLLIN;
1488
1489 if (sock_writeable(sk) && iucv_below_msglim(sk))
1490 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1491 else
1492 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1493
1494 return mask;
1495 }
1496
1497 static int iucv_sock_shutdown(struct socket *sock, int how)
1498 {
1499 struct sock *sk = sock->sk;
1500 struct iucv_sock *iucv = iucv_sk(sk);
1501 struct iucv_message txmsg;
1502 int err = 0;
1503
1504 how++;
1505
1506 if ((how & ~SHUTDOWN_MASK) || !how)
1507 return -EINVAL;
1508
1509 lock_sock(sk);
1510 switch (sk->sk_state) {
1511 case IUCV_LISTEN:
1512 case IUCV_DISCONN:
1513 case IUCV_CLOSING:
1514 case IUCV_CLOSED:
1515 err = -ENOTCONN;
1516 goto fail;
1517 default:
1518 break;
1519 }
1520
1521 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1522 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1523 txmsg.class = 0;
1524 txmsg.tag = 0;
1525 err = pr_iucv->message_send(iucv->path, &txmsg,
1526 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1527 if (err) {
1528 switch (err) {
1529 case 1:
1530 err = -ENOTCONN;
1531 break;
1532 case 2:
1533 err = -ECONNRESET;
1534 break;
1535 default:
1536 err = -ENOTCONN;
1537 break;
1538 }
1539 }
1540 } else
1541 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1542 }
1543
1544 sk->sk_shutdown |= how;
1545 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1546 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1547 iucv->path) {
1548 err = pr_iucv->path_quiesce(iucv->path, NULL);
1549 if (err)
1550 err = -ENOTCONN;
1551 /* skb_queue_purge(&sk->sk_receive_queue); */
1552 }
1553 skb_queue_purge(&sk->sk_receive_queue);
1554 }
1555
1556 /* Wake up anyone sleeping in poll */
1557 sk->sk_state_change(sk);
1558
1559 fail:
1560 release_sock(sk);
1561 return err;
1562 }
1563
1564 static int iucv_sock_release(struct socket *sock)
1565 {
1566 struct sock *sk = sock->sk;
1567 int err = 0;
1568
1569 if (!sk)
1570 return 0;
1571
1572 iucv_sock_close(sk);
1573
1574 sock_orphan(sk);
1575 iucv_sock_kill(sk);
1576 return err;
1577 }
1578
1579 /* getsockopt and setsockopt */
1580 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1581 char __user *optval, unsigned int optlen)
1582 {
1583 struct sock *sk = sock->sk;
1584 struct iucv_sock *iucv = iucv_sk(sk);
1585 int val;
1586 int rc;
1587
1588 if (level != SOL_IUCV)
1589 return -ENOPROTOOPT;
1590
1591 if (optlen < sizeof(int))
1592 return -EINVAL;
1593
1594 if (get_user(val, (int __user *) optval))
1595 return -EFAULT;
1596
1597 rc = 0;
1598
1599 lock_sock(sk);
1600 switch (optname) {
1601 case SO_IPRMDATA_MSG:
1602 if (val)
1603 iucv->flags |= IUCV_IPRMDATA;
1604 else
1605 iucv->flags &= ~IUCV_IPRMDATA;
1606 break;
1607 case SO_MSGLIMIT:
1608 switch (sk->sk_state) {
1609 case IUCV_OPEN:
1610 case IUCV_BOUND:
1611 if (val < 1 || val > (u16)(~0))
1612 rc = -EINVAL;
1613 else
1614 iucv->msglimit = val;
1615 break;
1616 default:
1617 rc = -EINVAL;
1618 break;
1619 }
1620 break;
1621 default:
1622 rc = -ENOPROTOOPT;
1623 break;
1624 }
1625 release_sock(sk);
1626
1627 return rc;
1628 }
1629
1630 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1631 char __user *optval, int __user *optlen)
1632 {
1633 struct sock *sk = sock->sk;
1634 struct iucv_sock *iucv = iucv_sk(sk);
1635 unsigned int val;
1636 int 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 case SO_MSGSIZE:
1660 if (sk->sk_state == IUCV_OPEN)
1661 return -EBADFD;
1662 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1663 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1664 0x7fffffff;
1665 break;
1666 default:
1667 return -ENOPROTOOPT;
1668 }
1669
1670 if (put_user(len, optlen))
1671 return -EFAULT;
1672 if (copy_to_user(optval, &val, len))
1673 return -EFAULT;
1674
1675 return 0;
1676 }
1677
1678
1679 /* Callback wrappers - called from iucv base support */
1680 static int iucv_callback_connreq(struct iucv_path *path,
1681 u8 ipvmid[8], u8 ipuser[16])
1682 {
1683 unsigned char user_data[16];
1684 unsigned char nuser_data[16];
1685 unsigned char src_name[8];
1686 struct sock *sk, *nsk;
1687 struct iucv_sock *iucv, *niucv;
1688 int err;
1689
1690 memcpy(src_name, ipuser, 8);
1691 EBCASC(src_name, 8);
1692 /* Find out if this path belongs to af_iucv. */
1693 read_lock(&iucv_sk_list.lock);
1694 iucv = NULL;
1695 sk = NULL;
1696 sk_for_each(sk, &iucv_sk_list.head)
1697 if (sk->sk_state == IUCV_LISTEN &&
1698 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1699 /*
1700 * Found a listening socket with
1701 * src_name == ipuser[0-7].
1702 */
1703 iucv = iucv_sk(sk);
1704 break;
1705 }
1706 read_unlock(&iucv_sk_list.lock);
1707 if (!iucv)
1708 /* No socket found, not one of our paths. */
1709 return -EINVAL;
1710
1711 bh_lock_sock(sk);
1712
1713 /* Check if parent socket is listening */
1714 low_nmcpy(user_data, iucv->src_name);
1715 high_nmcpy(user_data, iucv->dst_name);
1716 ASCEBC(user_data, sizeof(user_data));
1717 if (sk->sk_state != IUCV_LISTEN) {
1718 err = pr_iucv->path_sever(path, user_data);
1719 iucv_path_free(path);
1720 goto fail;
1721 }
1722
1723 /* Check for backlog size */
1724 if (sk_acceptq_is_full(sk)) {
1725 err = pr_iucv->path_sever(path, user_data);
1726 iucv_path_free(path);
1727 goto fail;
1728 }
1729
1730 /* Create the new socket */
1731 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1732 if (!nsk) {
1733 err = pr_iucv->path_sever(path, user_data);
1734 iucv_path_free(path);
1735 goto fail;
1736 }
1737
1738 niucv = iucv_sk(nsk);
1739 iucv_sock_init(nsk, sk);
1740
1741 /* Set the new iucv_sock */
1742 memcpy(niucv->dst_name, ipuser + 8, 8);
1743 EBCASC(niucv->dst_name, 8);
1744 memcpy(niucv->dst_user_id, ipvmid, 8);
1745 memcpy(niucv->src_name, iucv->src_name, 8);
1746 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1747 niucv->path = path;
1748
1749 /* Call iucv_accept */
1750 high_nmcpy(nuser_data, ipuser + 8);
1751 memcpy(nuser_data + 8, niucv->src_name, 8);
1752 ASCEBC(nuser_data + 8, 8);
1753
1754 /* set message limit for path based on msglimit of accepting socket */
1755 niucv->msglimit = iucv->msglimit;
1756 path->msglim = iucv->msglimit;
1757 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1758 if (err) {
1759 iucv_sever_path(nsk, 1);
1760 iucv_sock_kill(nsk);
1761 goto fail;
1762 }
1763
1764 iucv_accept_enqueue(sk, nsk);
1765
1766 /* Wake up accept */
1767 nsk->sk_state = IUCV_CONNECTED;
1768 sk->sk_data_ready(sk);
1769 err = 0;
1770 fail:
1771 bh_unlock_sock(sk);
1772 return 0;
1773 }
1774
1775 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1776 {
1777 struct sock *sk = path->private;
1778
1779 sk->sk_state = IUCV_CONNECTED;
1780 sk->sk_state_change(sk);
1781 }
1782
1783 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1784 {
1785 struct sock *sk = path->private;
1786 struct iucv_sock *iucv = iucv_sk(sk);
1787 struct sk_buff *skb;
1788 struct sock_msg_q *save_msg;
1789 int len;
1790
1791 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1792 pr_iucv->message_reject(path, msg);
1793 return;
1794 }
1795
1796 spin_lock(&iucv->message_q.lock);
1797
1798 if (!list_empty(&iucv->message_q.list) ||
1799 !skb_queue_empty(&iucv->backlog_skb_q))
1800 goto save_message;
1801
1802 len = atomic_read(&sk->sk_rmem_alloc);
1803 len += SKB_TRUESIZE(iucv_msg_length(msg));
1804 if (len > sk->sk_rcvbuf)
1805 goto save_message;
1806
1807 skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1808 if (!skb)
1809 goto save_message;
1810
1811 iucv_process_message(sk, skb, path, msg);
1812 goto out_unlock;
1813
1814 save_message:
1815 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1816 if (!save_msg)
1817 goto out_unlock;
1818 save_msg->path = path;
1819 save_msg->msg = *msg;
1820
1821 list_add_tail(&save_msg->list, &iucv->message_q.list);
1822
1823 out_unlock:
1824 spin_unlock(&iucv->message_q.lock);
1825 }
1826
1827 static void iucv_callback_txdone(struct iucv_path *path,
1828 struct iucv_message *msg)
1829 {
1830 struct sock *sk = path->private;
1831 struct sk_buff *this = NULL;
1832 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1833 struct sk_buff *list_skb = list->next;
1834 unsigned long flags;
1835
1836 bh_lock_sock(sk);
1837 if (!skb_queue_empty(list)) {
1838 spin_lock_irqsave(&list->lock, flags);
1839
1840 while (list_skb != (struct sk_buff *)list) {
1841 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1842 this = list_skb;
1843 break;
1844 }
1845 list_skb = list_skb->next;
1846 }
1847 if (this)
1848 __skb_unlink(this, list);
1849
1850 spin_unlock_irqrestore(&list->lock, flags);
1851
1852 if (this) {
1853 kfree_skb(this);
1854 /* wake up any process waiting for sending */
1855 iucv_sock_wake_msglim(sk);
1856 }
1857 }
1858
1859 if (sk->sk_state == IUCV_CLOSING) {
1860 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1861 sk->sk_state = IUCV_CLOSED;
1862 sk->sk_state_change(sk);
1863 }
1864 }
1865 bh_unlock_sock(sk);
1866
1867 }
1868
1869 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1870 {
1871 struct sock *sk = path->private;
1872
1873 if (sk->sk_state == IUCV_CLOSED)
1874 return;
1875
1876 bh_lock_sock(sk);
1877 iucv_sever_path(sk, 1);
1878 sk->sk_state = IUCV_DISCONN;
1879
1880 sk->sk_state_change(sk);
1881 bh_unlock_sock(sk);
1882 }
1883
1884 /* called if the other communication side shuts down its RECV direction;
1885 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1886 */
1887 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1888 {
1889 struct sock *sk = path->private;
1890
1891 bh_lock_sock(sk);
1892 if (sk->sk_state != IUCV_CLOSED) {
1893 sk->sk_shutdown |= SEND_SHUTDOWN;
1894 sk->sk_state_change(sk);
1895 }
1896 bh_unlock_sock(sk);
1897 }
1898
1899 /***************** HiperSockets transport callbacks ********************/
1900 static void afiucv_swap_src_dest(struct sk_buff *skb)
1901 {
1902 struct af_iucv_trans_hdr *trans_hdr =
1903 (struct af_iucv_trans_hdr *)skb->data;
1904 char tmpID[8];
1905 char tmpName[8];
1906
1907 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1908 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1909 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1910 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1911 memcpy(tmpID, trans_hdr->srcUserID, 8);
1912 memcpy(tmpName, trans_hdr->srcAppName, 8);
1913 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1914 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1915 memcpy(trans_hdr->destUserID, tmpID, 8);
1916 memcpy(trans_hdr->destAppName, tmpName, 8);
1917 skb_push(skb, ETH_HLEN);
1918 memset(skb->data, 0, ETH_HLEN);
1919 }
1920
1921 /**
1922 * afiucv_hs_callback_syn - react on received SYN
1923 **/
1924 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1925 {
1926 struct sock *nsk;
1927 struct iucv_sock *iucv, *niucv;
1928 struct af_iucv_trans_hdr *trans_hdr;
1929 int err;
1930
1931 iucv = iucv_sk(sk);
1932 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1933 if (!iucv) {
1934 /* no sock - connection refused */
1935 afiucv_swap_src_dest(skb);
1936 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1937 err = dev_queue_xmit(skb);
1938 goto out;
1939 }
1940
1941 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1942 bh_lock_sock(sk);
1943 if ((sk->sk_state != IUCV_LISTEN) ||
1944 sk_acceptq_is_full(sk) ||
1945 !nsk) {
1946 /* error on server socket - connection refused */
1947 afiucv_swap_src_dest(skb);
1948 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1949 err = dev_queue_xmit(skb);
1950 iucv_sock_kill(nsk);
1951 bh_unlock_sock(sk);
1952 goto out;
1953 }
1954
1955 niucv = iucv_sk(nsk);
1956 iucv_sock_init(nsk, sk);
1957 niucv->transport = AF_IUCV_TRANS_HIPER;
1958 niucv->msglimit = iucv->msglimit;
1959 if (!trans_hdr->window)
1960 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1961 else
1962 niucv->msglimit_peer = trans_hdr->window;
1963 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1964 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1965 memcpy(niucv->src_name, iucv->src_name, 8);
1966 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1967 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1968 niucv->hs_dev = iucv->hs_dev;
1969 dev_hold(niucv->hs_dev);
1970 afiucv_swap_src_dest(skb);
1971 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1972 trans_hdr->window = niucv->msglimit;
1973 /* if receiver acks the xmit connection is established */
1974 err = dev_queue_xmit(skb);
1975 if (!err) {
1976 iucv_accept_enqueue(sk, nsk);
1977 nsk->sk_state = IUCV_CONNECTED;
1978 sk->sk_data_ready(sk);
1979 } else
1980 iucv_sock_kill(nsk);
1981 bh_unlock_sock(sk);
1982
1983 out:
1984 return NET_RX_SUCCESS;
1985 }
1986
1987 /**
1988 * afiucv_hs_callback_synack() - react on received SYN-ACK
1989 **/
1990 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1991 {
1992 struct iucv_sock *iucv = iucv_sk(sk);
1993 struct af_iucv_trans_hdr *trans_hdr =
1994 (struct af_iucv_trans_hdr *)skb->data;
1995
1996 if (!iucv)
1997 goto out;
1998 if (sk->sk_state != IUCV_BOUND)
1999 goto out;
2000 bh_lock_sock(sk);
2001 iucv->msglimit_peer = trans_hdr->window;
2002 sk->sk_state = IUCV_CONNECTED;
2003 sk->sk_state_change(sk);
2004 bh_unlock_sock(sk);
2005 out:
2006 kfree_skb(skb);
2007 return NET_RX_SUCCESS;
2008 }
2009
2010 /**
2011 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2012 **/
2013 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2014 {
2015 struct iucv_sock *iucv = iucv_sk(sk);
2016
2017 if (!iucv)
2018 goto out;
2019 if (sk->sk_state != IUCV_BOUND)
2020 goto out;
2021 bh_lock_sock(sk);
2022 sk->sk_state = IUCV_DISCONN;
2023 sk->sk_state_change(sk);
2024 bh_unlock_sock(sk);
2025 out:
2026 kfree_skb(skb);
2027 return NET_RX_SUCCESS;
2028 }
2029
2030 /**
2031 * afiucv_hs_callback_fin() - react on received FIN
2032 **/
2033 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2034 {
2035 struct iucv_sock *iucv = iucv_sk(sk);
2036
2037 /* other end of connection closed */
2038 if (!iucv)
2039 goto out;
2040 bh_lock_sock(sk);
2041 if (sk->sk_state == IUCV_CONNECTED) {
2042 sk->sk_state = IUCV_DISCONN;
2043 sk->sk_state_change(sk);
2044 }
2045 bh_unlock_sock(sk);
2046 out:
2047 kfree_skb(skb);
2048 return NET_RX_SUCCESS;
2049 }
2050
2051 /**
2052 * afiucv_hs_callback_win() - react on received WIN
2053 **/
2054 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2055 {
2056 struct iucv_sock *iucv = iucv_sk(sk);
2057 struct af_iucv_trans_hdr *trans_hdr =
2058 (struct af_iucv_trans_hdr *)skb->data;
2059
2060 if (!iucv)
2061 return NET_RX_SUCCESS;
2062
2063 if (sk->sk_state != IUCV_CONNECTED)
2064 return NET_RX_SUCCESS;
2065
2066 atomic_sub(trans_hdr->window, &iucv->msg_sent);
2067 iucv_sock_wake_msglim(sk);
2068 return NET_RX_SUCCESS;
2069 }
2070
2071 /**
2072 * afiucv_hs_callback_rx() - react on received data
2073 **/
2074 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2075 {
2076 struct iucv_sock *iucv = iucv_sk(sk);
2077
2078 if (!iucv) {
2079 kfree_skb(skb);
2080 return NET_RX_SUCCESS;
2081 }
2082
2083 if (sk->sk_state != IUCV_CONNECTED) {
2084 kfree_skb(skb);
2085 return NET_RX_SUCCESS;
2086 }
2087
2088 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2089 kfree_skb(skb);
2090 return NET_RX_SUCCESS;
2091 }
2092
2093 /* write stuff from iucv_msg to skb cb */
2094 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2095 skb_reset_transport_header(skb);
2096 skb_reset_network_header(skb);
2097 IUCV_SKB_CB(skb)->offset = 0;
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 sock *sk;
2119 struct iucv_sock *iucv;
2120 struct af_iucv_trans_hdr *trans_hdr;
2121 char nullstring[8];
2122 int err = 0;
2123
2124 if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2125 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2126 (int)skb->len,
2127 (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2128 kfree_skb(skb);
2129 return NET_RX_SUCCESS;
2130 }
2131 if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2132 if (skb_linearize(skb)) {
2133 WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2134 (int)skb->len);
2135 kfree_skb(skb);
2136 return NET_RX_SUCCESS;
2137 }
2138 skb_pull(skb, ETH_HLEN);
2139 trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2140 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2141 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2142 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2143 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2144 memset(nullstring, 0, sizeof(nullstring));
2145 iucv = NULL;
2146 sk = NULL;
2147 read_lock(&iucv_sk_list.lock);
2148 sk_for_each(sk, &iucv_sk_list.head) {
2149 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2150 if ((!memcmp(&iucv_sk(sk)->src_name,
2151 trans_hdr->destAppName, 8)) &&
2152 (!memcmp(&iucv_sk(sk)->src_user_id,
2153 trans_hdr->destUserID, 8)) &&
2154 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2155 (!memcmp(&iucv_sk(sk)->dst_user_id,
2156 nullstring, 8))) {
2157 iucv = iucv_sk(sk);
2158 break;
2159 }
2160 } else {
2161 if ((!memcmp(&iucv_sk(sk)->src_name,
2162 trans_hdr->destAppName, 8)) &&
2163 (!memcmp(&iucv_sk(sk)->src_user_id,
2164 trans_hdr->destUserID, 8)) &&
2165 (!memcmp(&iucv_sk(sk)->dst_name,
2166 trans_hdr->srcAppName, 8)) &&
2167 (!memcmp(&iucv_sk(sk)->dst_user_id,
2168 trans_hdr->srcUserID, 8))) {
2169 iucv = iucv_sk(sk);
2170 break;
2171 }
2172 }
2173 }
2174 read_unlock(&iucv_sk_list.lock);
2175 if (!iucv)
2176 sk = NULL;
2177
2178 /* no sock
2179 how should we send with no sock
2180 1) send without sock no send rc checking?
2181 2) introduce default sock to handle this cases
2182
2183 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2184 data -> send FIN
2185 SYN|ACK, SYN|FIN, FIN -> no action? */
2186
2187 switch (trans_hdr->flags) {
2188 case AF_IUCV_FLAG_SYN:
2189 /* connect request */
2190 err = afiucv_hs_callback_syn(sk, skb);
2191 break;
2192 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2193 /* connect request confirmed */
2194 err = afiucv_hs_callback_synack(sk, skb);
2195 break;
2196 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2197 /* connect request refused */
2198 err = afiucv_hs_callback_synfin(sk, skb);
2199 break;
2200 case (AF_IUCV_FLAG_FIN):
2201 /* close request */
2202 err = afiucv_hs_callback_fin(sk, skb);
2203 break;
2204 case (AF_IUCV_FLAG_WIN):
2205 err = afiucv_hs_callback_win(sk, skb);
2206 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2207 kfree_skb(skb);
2208 break;
2209 }
2210 /* fall through and receive non-zero length data */
2211 case (AF_IUCV_FLAG_SHT):
2212 /* shutdown request */
2213 /* fall through and receive zero length data */
2214 case 0:
2215 /* plain data frame */
2216 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2217 err = afiucv_hs_callback_rx(sk, skb);
2218 break;
2219 default:
2220 ;
2221 }
2222
2223 return err;
2224 }
2225
2226 /**
2227 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2228 * transport
2229 **/
2230 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2231 enum iucv_tx_notify n)
2232 {
2233 struct sock *isk = skb->sk;
2234 struct sock *sk = NULL;
2235 struct iucv_sock *iucv = NULL;
2236 struct sk_buff_head *list;
2237 struct sk_buff *list_skb;
2238 struct sk_buff *nskb;
2239 unsigned long flags;
2240
2241 read_lock_irqsave(&iucv_sk_list.lock, flags);
2242 sk_for_each(sk, &iucv_sk_list.head)
2243 if (sk == isk) {
2244 iucv = iucv_sk(sk);
2245 break;
2246 }
2247 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2248
2249 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2250 return;
2251
2252 list = &iucv->send_skb_q;
2253 spin_lock_irqsave(&list->lock, flags);
2254 if (skb_queue_empty(list))
2255 goto out_unlock;
2256 list_skb = list->next;
2257 nskb = list_skb->next;
2258 while (list_skb != (struct sk_buff *)list) {
2259 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2260 switch (n) {
2261 case TX_NOTIFY_OK:
2262 __skb_unlink(list_skb, list);
2263 kfree_skb(list_skb);
2264 iucv_sock_wake_msglim(sk);
2265 break;
2266 case TX_NOTIFY_PENDING:
2267 atomic_inc(&iucv->pendings);
2268 break;
2269 case TX_NOTIFY_DELAYED_OK:
2270 __skb_unlink(list_skb, list);
2271 atomic_dec(&iucv->pendings);
2272 if (atomic_read(&iucv->pendings) <= 0)
2273 iucv_sock_wake_msglim(sk);
2274 kfree_skb(list_skb);
2275 break;
2276 case TX_NOTIFY_UNREACHABLE:
2277 case TX_NOTIFY_DELAYED_UNREACHABLE:
2278 case TX_NOTIFY_TPQFULL: /* not yet used */
2279 case TX_NOTIFY_GENERALERROR:
2280 case TX_NOTIFY_DELAYED_GENERALERROR:
2281 __skb_unlink(list_skb, list);
2282 kfree_skb(list_skb);
2283 if (sk->sk_state == IUCV_CONNECTED) {
2284 sk->sk_state = IUCV_DISCONN;
2285 sk->sk_state_change(sk);
2286 }
2287 break;
2288 }
2289 break;
2290 }
2291 list_skb = nskb;
2292 nskb = nskb->next;
2293 }
2294 out_unlock:
2295 spin_unlock_irqrestore(&list->lock, flags);
2296
2297 if (sk->sk_state == IUCV_CLOSING) {
2298 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2299 sk->sk_state = IUCV_CLOSED;
2300 sk->sk_state_change(sk);
2301 }
2302 }
2303
2304 }
2305
2306 /*
2307 * afiucv_netdev_event: handle netdev notifier chain events
2308 */
2309 static int afiucv_netdev_event(struct notifier_block *this,
2310 unsigned long event, void *ptr)
2311 {
2312 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2313 struct sock *sk;
2314 struct iucv_sock *iucv;
2315
2316 switch (event) {
2317 case NETDEV_REBOOT:
2318 case NETDEV_GOING_DOWN:
2319 sk_for_each(sk, &iucv_sk_list.head) {
2320 iucv = iucv_sk(sk);
2321 if ((iucv->hs_dev == event_dev) &&
2322 (sk->sk_state == IUCV_CONNECTED)) {
2323 if (event == NETDEV_GOING_DOWN)
2324 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2325 sk->sk_state = IUCV_DISCONN;
2326 sk->sk_state_change(sk);
2327 }
2328 }
2329 break;
2330 case NETDEV_DOWN:
2331 case NETDEV_UNREGISTER:
2332 default:
2333 break;
2334 }
2335 return NOTIFY_DONE;
2336 }
2337
2338 static struct notifier_block afiucv_netdev_notifier = {
2339 .notifier_call = afiucv_netdev_event,
2340 };
2341
2342 static const struct proto_ops iucv_sock_ops = {
2343 .family = PF_IUCV,
2344 .owner = THIS_MODULE,
2345 .release = iucv_sock_release,
2346 .bind = iucv_sock_bind,
2347 .connect = iucv_sock_connect,
2348 .listen = iucv_sock_listen,
2349 .accept = iucv_sock_accept,
2350 .getname = iucv_sock_getname,
2351 .sendmsg = iucv_sock_sendmsg,
2352 .recvmsg = iucv_sock_recvmsg,
2353 .poll = iucv_sock_poll,
2354 .ioctl = sock_no_ioctl,
2355 .mmap = sock_no_mmap,
2356 .socketpair = sock_no_socketpair,
2357 .shutdown = iucv_sock_shutdown,
2358 .setsockopt = iucv_sock_setsockopt,
2359 .getsockopt = iucv_sock_getsockopt,
2360 };
2361
2362 static const struct net_proto_family iucv_sock_family_ops = {
2363 .family = AF_IUCV,
2364 .owner = THIS_MODULE,
2365 .create = iucv_sock_create,
2366 };
2367
2368 static struct packet_type iucv_packet_type = {
2369 .type = cpu_to_be16(ETH_P_AF_IUCV),
2370 .func = afiucv_hs_rcv,
2371 };
2372
2373 static int afiucv_iucv_init(void)
2374 {
2375 int err;
2376
2377 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2378 if (err)
2379 goto out;
2380 /* establish dummy device */
2381 af_iucv_driver.bus = pr_iucv->bus;
2382 err = driver_register(&af_iucv_driver);
2383 if (err)
2384 goto out_iucv;
2385 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2386 if (!af_iucv_dev) {
2387 err = -ENOMEM;
2388 goto out_driver;
2389 }
2390 dev_set_name(af_iucv_dev, "af_iucv");
2391 af_iucv_dev->bus = pr_iucv->bus;
2392 af_iucv_dev->parent = pr_iucv->root;
2393 af_iucv_dev->release = (void (*)(struct device *))kfree;
2394 af_iucv_dev->driver = &af_iucv_driver;
2395 err = device_register(af_iucv_dev);
2396 if (err)
2397 goto out_driver;
2398 return 0;
2399
2400 out_driver:
2401 driver_unregister(&af_iucv_driver);
2402 out_iucv:
2403 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2404 out:
2405 return err;
2406 }
2407
2408 static int __init afiucv_init(void)
2409 {
2410 int err;
2411
2412 if (MACHINE_IS_VM) {
2413 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2414 if (unlikely(err)) {
2415 WARN_ON(err);
2416 err = -EPROTONOSUPPORT;
2417 goto out;
2418 }
2419
2420 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2421 if (!pr_iucv) {
2422 printk(KERN_WARNING "iucv_if lookup failed\n");
2423 memset(&iucv_userid, 0, sizeof(iucv_userid));
2424 }
2425 } else {
2426 memset(&iucv_userid, 0, sizeof(iucv_userid));
2427 pr_iucv = NULL;
2428 }
2429
2430 err = proto_register(&iucv_proto, 0);
2431 if (err)
2432 goto out;
2433 err = sock_register(&iucv_sock_family_ops);
2434 if (err)
2435 goto out_proto;
2436
2437 if (pr_iucv) {
2438 err = afiucv_iucv_init();
2439 if (err)
2440 goto out_sock;
2441 } else
2442 register_netdevice_notifier(&afiucv_netdev_notifier);
2443 dev_add_pack(&iucv_packet_type);
2444 return 0;
2445
2446 out_sock:
2447 sock_unregister(PF_IUCV);
2448 out_proto:
2449 proto_unregister(&iucv_proto);
2450 out:
2451 if (pr_iucv)
2452 symbol_put(iucv_if);
2453 return err;
2454 }
2455
2456 static void __exit afiucv_exit(void)
2457 {
2458 if (pr_iucv) {
2459 device_unregister(af_iucv_dev);
2460 driver_unregister(&af_iucv_driver);
2461 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2462 symbol_put(iucv_if);
2463 } else
2464 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2465 dev_remove_pack(&iucv_packet_type);
2466 sock_unregister(PF_IUCV);
2467 proto_unregister(&iucv_proto);
2468 }
2469
2470 module_init(afiucv_init);
2471 module_exit(afiucv_exit);
2472
2473 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2474 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2475 MODULE_VERSION(VERSION);
2476 MODULE_LICENSE("GPL");
2477 MODULE_ALIAS_NETPROTO(PF_IUCV);
2478
Ubuntu Artful kernel mirror