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net/af_iucv: build proper skbs for HiperTransport
[linux-block.git] / net / iucv / af_iucv.c
CommitLineData
09c434b8 1// SPDX-License-Identifier: GPL-2.0-only
eac3731b 2/*
eac3731b
JH		 3 * IUCV protocol stack for Linux on zSeries
4 *
c23cad92 5 * Copyright IBM Corp. 2006, 2009
eac3731b
JH		 6 *
7 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
c23cad92
UB		 8 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
9 * PM functions:
10 * Ursula Braun <ursula.braun@de.ibm.com>
eac3731b
JH		 11 */
12
8f7c502c
UB		 13#define KMSG_COMPONENT "af_iucv"
14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
eac3731b 16#include <linux/module.h>
238965b7 17#include <linux/netdevice.h>
eac3731b
JH		 18#include <linux/types.h>
19#include <linux/list.h>
20#include <linux/errno.h>
21#include <linux/kernel.h>
174cd4b1 22#include <linux/sched/signal.h>
eac3731b
JH		 23#include <linux/slab.h>
24#include <linux/skbuff.h>
25#include <linux/init.h>
26#include <linux/poll.h>
02f06918 27#include <linux/security.h>
eac3731b
JH		 28#include <net/sock.h>
29#include <asm/ebcdic.h>
30#include <asm/cpcmd.h>
31#include <linux/kmod.h>
32
eac3731b
JH		 33#include <net/iucv/af_iucv.h>
34
3881ac44 35#define VERSION "1.2"
eac3731b
JH		 36
37static char iucv_userid[80];
38
5708e868 39static const struct proto_ops iucv_sock_ops;
eac3731b
JH		 40
41static struct proto iucv_proto = {
42 .name = "AF_IUCV",
43 .owner = THIS_MODULE,
44 .obj_size = sizeof(struct iucv_sock),
45};
46
6fcd61f7
FB		 47static struct iucv_interface *pr_iucv;
48
b8942e3b
HB		 49/* special AF_IUCV IPRM messages */
50static const u8 iprm_shutdown[8] =
51 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
52
86c85e1f 53#define TRGCLS_SIZE FIELD_SIZEOF(struct iucv_message, class)
44b1e6b5 54
0ea920d2
HB		 55#define __iucv_sock_wait(sk, condition, timeo, ret) \
56do { \
57 DEFINE_WAIT(__wait); \
58 long __timeo = timeo; \
59 ret = 0; \
aa395145 60 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
0ea920d2 61 while (!(condition)) { \
0ea920d2
HB		 62 if (!__timeo) { \
63 ret = -EAGAIN; \
64 break; \
65 } \
66 if (signal_pending(current)) { \
67 ret = sock_intr_errno(__timeo); \
68 break; \
69 } \
70 release_sock(sk); \
71 __timeo = schedule_timeout(__timeo); \
72 lock_sock(sk); \
73 ret = sock_error(sk); \
74 if (ret) \
75 break; \
76 } \
aa395145 77 finish_wait(sk_sleep(sk), &__wait); \
0ea920d2
HB		 78} while (0)
79
80#define iucv_sock_wait(sk, condition, timeo) \
81({ \
82 int __ret = 0; \
83 if (!(condition)) \
84 __iucv_sock_wait(sk, condition, timeo, __ret); \
85 __ret; \
86})
44b1e6b5 87
57f20448
HC		 88static void iucv_sock_kill(struct sock *sk);
89static void iucv_sock_close(struct sock *sk);
7d316b94 90static void iucv_sever_path(struct sock *, int);
57f20448 91
3881ac44
UB		 92static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
93 struct packet_type *pt, struct net_device *orig_dev);
94static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
95 struct sk_buff *skb, u8 flags);
96static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
97
eac3731b
JH		 98/* Call Back functions */
99static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
100static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
91e60eb6
UB		 101static void iucv_callback_connack(struct iucv_path *, u8 *);
102static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
103static void iucv_callback_connrej(struct iucv_path *, u8 *);
104static void iucv_callback_shutdown(struct iucv_path *, u8 *);
eac3731b
JH		 105
106static struct iucv_sock_list iucv_sk_list = {
3db8ce35 107 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
eac3731b
JH		 108 .autobind_name = ATOMIC_INIT(0)
109};
110
111static struct iucv_handler af_iucv_handler = {
112 .path_pending = iucv_callback_connreq,
113 .path_complete = iucv_callback_connack,
114 .path_severed = iucv_callback_connrej,
115 .message_pending = iucv_callback_rx,
af88b52d
HB		 116 .message_complete = iucv_callback_txdone,
117 .path_quiesced = iucv_callback_shutdown,
eac3731b
JH		 118};
119
120static inline void high_nmcpy(unsigned char *dst, char *src)
121{
122 memcpy(dst, src, 8);
123}
124
125static inline void low_nmcpy(unsigned char *dst, char *src)
126{
127 memcpy(&dst[8], src, 8);
128}
129
c23cad92
UB		 130static int afiucv_pm_prepare(struct device *dev)
131{
132#ifdef CONFIG_PM_DEBUG
133 printk(KERN_WARNING "afiucv_pm_prepare\n");
134#endif
135 return 0;
136}
137
138static void afiucv_pm_complete(struct device *dev)
139{
140#ifdef CONFIG_PM_DEBUG
141 printk(KERN_WARNING "afiucv_pm_complete\n");
142#endif
c23cad92
UB		 143}
144
145/**
146 * afiucv_pm_freeze() - Freeze PM callback
147 * @dev: AFIUCV dummy device
148 *
149 * Sever all established IUCV communication pathes
150 */
151static int afiucv_pm_freeze(struct device *dev)
152{
153 struct iucv_sock *iucv;
154 struct sock *sk;
c23cad92
UB		 155
156#ifdef CONFIG_PM_DEBUG
157 printk(KERN_WARNING "afiucv_pm_freeze\n");
158#endif
159 read_lock(&iucv_sk_list.lock);
b67bfe0d 160 sk_for_each(sk, &iucv_sk_list.head) {
c23cad92 161 iucv = iucv_sk(sk);
c23cad92 162 switch (sk->sk_state) {
c23cad92
UB		 163 case IUCV_DISCONN:
164 case IUCV_CLOSING:
165 case IUCV_CONNECTED:
7d316b94 166 iucv_sever_path(sk, 0);
c23cad92
UB		 167 break;
168 case IUCV_OPEN:
169 case IUCV_BOUND:
170 case IUCV_LISTEN:
171 case IUCV_CLOSED:
172 default:
173 break;
174 }
7d316b94
UB		 175 skb_queue_purge(&iucv->send_skb_q);
176 skb_queue_purge(&iucv->backlog_skb_q);
c23cad92
UB		 177 }
178 read_unlock(&iucv_sk_list.lock);
fb3b467e 179 return 0;
c23cad92
UB		 180}
181
182/**
183 * afiucv_pm_restore_thaw() - Thaw and restore PM callback
184 * @dev: AFIUCV dummy device
185 *
186 * socket clean up after freeze
187 */
188static int afiucv_pm_restore_thaw(struct device *dev)
189{
c23cad92 190 struct sock *sk;
c23cad92
UB		 191
192#ifdef CONFIG_PM_DEBUG
193 printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
194#endif
195 read_lock(&iucv_sk_list.lock);
b67bfe0d 196 sk_for_each(sk, &iucv_sk_list.head) {
c23cad92
UB		 197 switch (sk->sk_state) {
198 case IUCV_CONNECTED:
199 sk->sk_err = EPIPE;
200 sk->sk_state = IUCV_DISCONN;
201 sk->sk_state_change(sk);
202 break;
203 case IUCV_DISCONN:
c23cad92
UB		 204 case IUCV_CLOSING:
205 case IUCV_LISTEN:
206 case IUCV_BOUND:
207 case IUCV_OPEN:
208 default:
209 break;
210 }
211 }
212 read_unlock(&iucv_sk_list.lock);
213 return 0;
214}
215
47145210 216static const struct dev_pm_ops afiucv_pm_ops = {
c23cad92
UB		 217 .prepare = afiucv_pm_prepare,
218 .complete = afiucv_pm_complete,
219 .freeze = afiucv_pm_freeze,
220 .thaw = afiucv_pm_restore_thaw,
221 .restore = afiucv_pm_restore_thaw,
222};
223
224static struct device_driver af_iucv_driver = {
225 .owner = THIS_MODULE,
226 .name = "afiucv",
6fcd61f7 227 .bus = NULL,
c23cad92
UB		 228 .pm = &afiucv_pm_ops,
229};
230
231/* dummy device used as trigger for PM functions */
232static struct device *af_iucv_dev;
233
b8942e3b
HB		 234/**
235 * iucv_msg_length() - Returns the length of an iucv message.
236 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
237 *
238 * The function returns the length of the specified iucv message @msg of data
239 * stored in a buffer and of data stored in the parameter list (PRMDATA).
240 *
241 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
242 * data:
243 * PRMDATA[0..6] socket data (max 7 bytes);
244 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
245 *
25985edc 246 * The socket data length is computed by subtracting the socket data length
b8942e3b
HB		 247 * value from 0xFF.
248 * If the socket data len is greater 7, then PRMDATA can be used for special
249 * notifications (see iucv_sock_shutdown); and further,
250 * if the socket data len is > 7, the function returns 8.
251 *
252 * Use this function to allocate socket buffers to store iucv message data.
253 */
254static inline size_t iucv_msg_length(struct iucv_message *msg)
255{
256 size_t datalen;
257
258 if (msg->flags & IUCV_IPRMDATA) {
259 datalen = 0xff - msg->rmmsg[7];
260 return (datalen < 8) ? datalen : 8;
261 }
262 return msg->length;
263}
264
0ea920d2
HB		 265/**
266 * iucv_sock_in_state() - check for specific states
267 * @sk: sock structure
268 * @state: first iucv sk state
269 * @state: second iucv sk state
270 *
271 * Returns true if the socket in either in the first or second state.
272 */
273static int iucv_sock_in_state(struct sock *sk, int state, int state2)
274{
275 return (sk->sk_state == state || sk->sk_state == state2);
276}
277
278/**
279 * iucv_below_msglim() - function to check if messages can be sent
280 * @sk: sock structure
281 *
282 * Returns true if the send queue length is lower than the message limit.
283 * Always returns true if the socket is not connected (no iucv path for
284 * checking the message limit).
285 */
286static inline int iucv_below_msglim(struct sock *sk)
287{
288 struct iucv_sock *iucv = iucv_sk(sk);
289
290 if (sk->sk_state != IUCV_CONNECTED)
291 return 1;
3881ac44
UB		 292 if (iucv->transport == AF_IUCV_TRANS_IUCV)
293 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
294 else
295 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
296 (atomic_read(&iucv->pendings) <= 0));
0ea920d2
HB		 297}
298
299/**
300 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
301 */
302static void iucv_sock_wake_msglim(struct sock *sk)
303{
43815482
ED		 304 struct socket_wq *wq;
305
306 rcu_read_lock();
307 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 308 if (skwq_has_sleeper(wq))
43815482 309 wake_up_interruptible_all(&wq->wait);
0ea920d2 310 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
43815482 311 rcu_read_unlock();
0ea920d2
HB		 312}
313
3881ac44
UB		 314/**
315 * afiucv_hs_send() - send a message through HiperSockets transport
316 */
317static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
318 struct sk_buff *skb, u8 flags)
319{
3881ac44
UB		 320 struct iucv_sock *iucv = iucv_sk(sock);
321 struct af_iucv_trans_hdr *phs_hdr;
322 struct sk_buff *nskb;
323 int err, confirm_recv = 0;
324
cd11d112
JW		 325 phs_hdr = skb_push(skb, sizeof(*phs_hdr));
326 memset(phs_hdr, 0, sizeof(*phs_hdr));
3881ac44 327 skb_reset_network_header(skb);
3881ac44
UB		 328
329 phs_hdr->magic = ETH_P_AF_IUCV;
330 phs_hdr->version = 1;
331 phs_hdr->flags = flags;
332 if (flags == AF_IUCV_FLAG_SYN)
333 phs_hdr->window = iucv->msglimit;
334 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
335 confirm_recv = atomic_read(&iucv->msg_recv);
336 phs_hdr->window = confirm_recv;
337 if (confirm_recv)
338 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
339 }
340 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
341 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
342 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
343 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
344 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
345 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
346 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
347 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
348 if (imsg)
349 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
350
800c5eb7 351 skb->dev = iucv->hs_dev;
b2f54394
JW		 352 if (!skb->dev) {
353 err = -ENODEV;
354 goto err_free;
355 }
238965b7
JW		 356
357 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
358
b2f54394
JW		 359 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
360 err = -ENETDOWN;
361 goto err_free;
362 }
3881ac44 363 if (skb->len > skb->dev->mtu) {
b2f54394
JW		 364 if (sock->sk_type == SOCK_SEQPACKET) {
365 err = -EMSGSIZE;
366 goto err_free;
367 }
368 skb_trim(skb, skb->dev->mtu);
3881ac44 369 }
2e56c26b 370 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
238965b7
JW		 371
372 __skb_header_release(skb);
3881ac44 373 nskb = skb_clone(skb, GFP_ATOMIC);
b2f54394
JW		 374 if (!nskb) {
375 err = -ENOMEM;
376 goto err_free;
377 }
378
3881ac44
UB		 379 skb_queue_tail(&iucv->send_skb_q, nskb);
380 err = dev_queue_xmit(skb);
800c5eb7 381 if (net_xmit_eval(err)) {
3881ac44
UB		 382 skb_unlink(nskb, &iucv->send_skb_q);
383 kfree_skb(nskb);
384 } else {
385 atomic_sub(confirm_recv, &iucv->msg_recv);
386 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
387 }
800c5eb7 388 return net_xmit_eval(err);
b2f54394
JW		 389
390err_free:
391 kfree_skb(skb);
392 return err;
3881ac44
UB		 393}
394
eac3731b
JH		 395static struct sock *__iucv_get_sock_by_name(char *nm)
396{
397 struct sock *sk;
eac3731b 398
b67bfe0d 399 sk_for_each(sk, &iucv_sk_list.head)
eac3731b
JH		 400 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
401 return sk;
402
403 return NULL;
404}
405
406static void iucv_sock_destruct(struct sock *sk)
407{
408 skb_queue_purge(&sk->sk_receive_queue);
82492a35
UB		 409 skb_queue_purge(&sk->sk_error_queue);
410
411 sk_mem_reclaim(sk);
412
413 if (!sock_flag(sk, SOCK_DEAD)) {
414 pr_err("Attempt to release alive iucv socket %p\n", sk);
415 return;
416 }
417
418 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
b2c9c5df 419 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
82492a35
UB		 420 WARN_ON(sk->sk_wmem_queued);
421 WARN_ON(sk->sk_forward_alloc);
eac3731b
JH		 422}
423
424/* Cleanup Listen */
425static void iucv_sock_cleanup_listen(struct sock *parent)
426{
427 struct sock *sk;
428
429 /* Close non-accepted connections */
430 while ((sk = iucv_accept_dequeue(parent, NULL))) {
431 iucv_sock_close(sk);
432 iucv_sock_kill(sk);
433 }
434
435 parent->sk_state = IUCV_CLOSED;
eac3731b
JH		 436}
437
7514bab0 438/* Kill socket (only if zapped and orphaned) */
eac3731b
JH		 439static void iucv_sock_kill(struct sock *sk)
440{
441 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
442 return;
443
444 iucv_sock_unlink(&iucv_sk_list, sk);
445 sock_set_flag(sk, SOCK_DEAD);
446 sock_put(sk);
447}
448
7d316b94
UB		 449/* Terminate an IUCV path */
450static void iucv_sever_path(struct sock *sk, int with_user_data)
451{
452 unsigned char user_data[16];
453 struct iucv_sock *iucv = iucv_sk(sk);
454 struct iucv_path *path = iucv->path;
455
456 if (iucv->path) {
457 iucv->path = NULL;
458 if (with_user_data) {
459 low_nmcpy(user_data, iucv->src_name);
460 high_nmcpy(user_data, iucv->dst_name);
461 ASCEBC(user_data, sizeof(user_data));
462 pr_iucv->path_sever(path, user_data);
463 } else
464 pr_iucv->path_sever(path, NULL);
465 iucv_path_free(path);
466 }
467}
468
4e0ad322 469/* Send controlling flags through an IUCV socket for HIPER transport */
9fbd87d4
UB		 470static int iucv_send_ctrl(struct sock *sk, u8 flags)
471{
238965b7 472 struct iucv_sock *iucv = iucv_sk(sk);
9fbd87d4
UB		 473 int err = 0;
474 int blen;
475 struct sk_buff *skb;
4e0ad322 476 u8 shutdown = 0;
9fbd87d4 477
238965b7
JW		 478 blen = sizeof(struct af_iucv_trans_hdr) +
479 LL_RESERVED_SPACE(iucv->hs_dev);
4e0ad322
UB		 480 if (sk->sk_shutdown & SEND_SHUTDOWN) {
481 /* controlling flags should be sent anyway */
482 shutdown = sk->sk_shutdown;
483 sk->sk_shutdown &= RCV_SHUTDOWN;
484 }
9fbd87d4
UB		 485 skb = sock_alloc_send_skb(sk, blen, 1, &err);
486 if (skb) {
487 skb_reserve(skb, blen);
488 err = afiucv_hs_send(NULL, sk, skb, flags);
489 }
4e0ad322
UB		 490 if (shutdown)
491 sk->sk_shutdown = shutdown;
9fbd87d4
UB		 492 return err;
493}
494
eac3731b
JH		 495/* Close an IUCV socket */
496static void iucv_sock_close(struct sock *sk)
497{
eac3731b 498 struct iucv_sock *iucv = iucv_sk(sk);
561e0360 499 unsigned long timeo;
800c5eb7 500 int err = 0;
eac3731b 501
eac3731b
JH		 502 lock_sock(sk);
503
da99f056 504 switch (sk->sk_state) {
eac3731b
JH		 505 case IUCV_LISTEN:
506 iucv_sock_cleanup_listen(sk);
507 break;
508
509 case IUCV_CONNECTED:
3881ac44 510 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
9fbd87d4 511 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
3881ac44
UB		 512 sk->sk_state = IUCV_DISCONN;
513 sk->sk_state_change(sk);
514 }
816abbad 515 case IUCV_DISCONN: /* fall through */
561e0360
JH		 516 sk->sk_state = IUCV_CLOSING;
517 sk->sk_state_change(sk);
518
800c5eb7 519 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
561e0360
JH		 520 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
521 timeo = sk->sk_lingertime;
522 else
523 timeo = IUCV_DISCONN_TIMEOUT;
9f6298a6 524 iucv_sock_wait(sk,
0ea920d2
HB		 525 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
526 timeo);
561e0360
JH		 527 }
528
bbe188c8 529 case IUCV_CLOSING: /* fall through */
561e0360
JH		 530 sk->sk_state = IUCV_CLOSED;
531 sk->sk_state_change(sk);
532
eac3731b
JH		 533 sk->sk_err = ECONNRESET;
534 sk->sk_state_change(sk);
535
800c5eb7 536 skb_queue_purge(&iucv->send_skb_q);
561e0360 537 skb_queue_purge(&iucv->backlog_skb_q);
eac3731b 538
7d316b94
UB		 539 default: /* fall through */
540 iucv_sever_path(sk, 1);
3ff50b79 541 }
eac3731b 542
800c5eb7
UB		 543 if (iucv->hs_dev) {
544 dev_put(iucv->hs_dev);
545 iucv->hs_dev = NULL;
546 sk->sk_bound_dev_if = 0;
547 }
548
7514bab0
HB		 549 /* mark socket for deletion by iucv_sock_kill() */
550 sock_set_flag(sk, SOCK_ZAPPED);
551
eac3731b 552 release_sock(sk);
eac3731b
JH		 553}
554
555static void iucv_sock_init(struct sock *sk, struct sock *parent)
556{
02f06918 557 if (parent) {
eac3731b 558 sk->sk_type = parent->sk_type;
02f06918
PM		 559 security_sk_clone(parent, sk);
560 }
eac3731b
JH		 561}
562
11aa9c28 563static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
eac3731b
JH		 564{
565 struct sock *sk;
493d3971 566 struct iucv_sock *iucv;
eac3731b 567
11aa9c28 568 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
eac3731b
JH		 569 if (!sk)
570 return NULL;
493d3971 571 iucv = iucv_sk(sk);
eac3731b
JH		 572
573 sock_init_data(sock, sk);
493d3971
UB		 574 INIT_LIST_HEAD(&iucv->accept_q);
575 spin_lock_init(&iucv->accept_q_lock);
576 skb_queue_head_init(&iucv->send_skb_q);
577 INIT_LIST_HEAD(&iucv->message_q.list);
578 spin_lock_init(&iucv->message_q.lock);
579 skb_queue_head_init(&iucv->backlog_skb_q);
580 iucv->send_tag = 0;
3881ac44 581 atomic_set(&iucv->pendings, 0);
493d3971 582 iucv->flags = 0;
3881ac44
UB		 583 iucv->msglimit = 0;
584 atomic_set(&iucv->msg_sent, 0);
585 atomic_set(&iucv->msg_recv, 0);
493d3971 586 iucv->path = NULL;
3881ac44 587 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
493d3971 588 memset(&iucv->src_user_id , 0, 32);
3881ac44
UB		 589 if (pr_iucv)
590 iucv->transport = AF_IUCV_TRANS_IUCV;
591 else
592 iucv->transport = AF_IUCV_TRANS_HIPER;
eac3731b
JH		 593
594 sk->sk_destruct = iucv_sock_destruct;
595 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
eac3731b
JH		 596
597 sock_reset_flag(sk, SOCK_ZAPPED);
598
599 sk->sk_protocol = proto;
600 sk->sk_state = IUCV_OPEN;
601
eac3731b
JH		 602 iucv_sock_link(&iucv_sk_list, sk);
603 return sk;
604}
605
606/* Create an IUCV socket */
3f378b68
EP		 607static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
608 int kern)
eac3731b
JH		 609{
610 struct sock *sk;
611
aa8e71f5
HB		 612 if (protocol && protocol != PF_IUCV)
613 return -EPROTONOSUPPORT;
eac3731b
JH		 614
615 sock->state = SS_UNCONNECTED;
aa8e71f5
HB		 616
617 switch (sock->type) {
618 case SOCK_STREAM:
619 sock->ops = &iucv_sock_ops;
620 break;
621 case SOCK_SEQPACKET:
622 /* currently, proto ops can handle both sk types */
623 sock->ops = &iucv_sock_ops;
624 break;
625 default:
626 return -ESOCKTNOSUPPORT;
627 }
eac3731b 628
11aa9c28 629 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
eac3731b
JH		 630 if (!sk)
631 return -ENOMEM;
632
633 iucv_sock_init(sk, NULL);
634
635 return 0;
636}
637
638void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
639{
640 write_lock_bh(&l->lock);
641 sk_add_node(sk, &l->head);
642 write_unlock_bh(&l->lock);
643}
644
645void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
646{
647 write_lock_bh(&l->lock);
648 sk_del_node_init(sk);
649 write_unlock_bh(&l->lock);
650}
651
652void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
653{
febca281
UB		 654 unsigned long flags;
655 struct iucv_sock *par = iucv_sk(parent);
656
eac3731b 657 sock_hold(sk);
febca281
UB		 658 spin_lock_irqsave(&par->accept_q_lock, flags);
659 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
660 spin_unlock_irqrestore(&par->accept_q_lock, flags);
eac3731b 661 iucv_sk(sk)->parent = parent;
49f5eba7 662 sk_acceptq_added(parent);
eac3731b
JH		 663}
664
665void iucv_accept_unlink(struct sock *sk)
666{
febca281
UB		 667 unsigned long flags;
668 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
669
670 spin_lock_irqsave(&par->accept_q_lock, flags);
eac3731b 671 list_del_init(&iucv_sk(sk)->accept_q);
febca281 672 spin_unlock_irqrestore(&par->accept_q_lock, flags);
49f5eba7 673 sk_acceptq_removed(iucv_sk(sk)->parent);
eac3731b
JH		 674 iucv_sk(sk)->parent = NULL;
675 sock_put(sk);
676}
677
678struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
679{
680 struct iucv_sock *isk, *n;
681 struct sock *sk;
682
da99f056 683 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
eac3731b
JH		 684 sk = (struct sock *) isk;
685 lock_sock(sk);
686
687 if (sk->sk_state == IUCV_CLOSED) {
eac3731b 688 iucv_accept_unlink(sk);
febca281 689 release_sock(sk);
eac3731b
JH		 690 continue;
691 }
692
693 if (sk->sk_state == IUCV_CONNECTED ||
aac6399c 694 sk->sk_state == IUCV_DISCONN ||
eac3731b
JH		 695 !newsock) {
696 iucv_accept_unlink(sk);
697 if (newsock)
698 sock_graft(sk, newsock);
699
eac3731b
JH		 700 release_sock(sk);
701 return sk;
702 }
703
704 release_sock(sk);
705 }
706 return NULL;
707}
708
53a4b499
PH		 709static void __iucv_auto_name(struct iucv_sock *iucv)
710{
711 char name[12];
712
713 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
714 while (__iucv_get_sock_by_name(name)) {
715 sprintf(name, "%08x",
716 atomic_inc_return(&iucv_sk_list.autobind_name));
717 }
718 memcpy(iucv->src_name, name, 8);
719}
720
eac3731b
JH		 721/* Bind an unbound socket */
722static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
723 int addr_len)
724{
725 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
726 struct sock *sk = sock->sk;
727 struct iucv_sock *iucv;
3881ac44
UB		 728 int err = 0;
729 struct net_device *dev;
730 char uid[9];
eac3731b
JH		 731
732 /* Verify the input sockaddr */
e3c42b61
MJ		 733 if (addr_len < sizeof(struct sockaddr_iucv) ||
734 addr->sa_family != AF_IUCV)
52a82e23
UB		 735 return -EINVAL;
736
eac3731b
JH		 737 lock_sock(sk);
738 if (sk->sk_state != IUCV_OPEN) {
739 err = -EBADFD;
740 goto done;
741 }
742
743 write_lock_bh(&iucv_sk_list.lock);
744
745 iucv = iucv_sk(sk);
746 if (__iucv_get_sock_by_name(sa->siucv_name)) {
747 err = -EADDRINUSE;
748 goto done_unlock;
749 }
3881ac44 750 if (iucv->path)
eac3731b 751 goto done_unlock;
eac3731b
JH		 752
753 /* Bind the socket */
3881ac44
UB		 754 if (pr_iucv)
755 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
756 goto vm_bind; /* VM IUCV transport */
eac3731b 757
3881ac44
UB		 758 /* try hiper transport */
759 memcpy(uid, sa->siucv_user_id, sizeof(uid));
760 ASCEBC(uid, 8);
761 rcu_read_lock();
762 for_each_netdev_rcu(&init_net, dev) {
763 if (!memcmp(dev->perm_addr, uid, 8)) {
3881ac44 764 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
53a4b499
PH		 765 /* Check for unitialized siucv_name */
766 if (strncmp(sa->siucv_name, " ", 8) == 0)
767 __iucv_auto_name(iucv);
768 else
769 memcpy(iucv->src_name, sa->siucv_name, 8);
816abbad 770 sk->sk_bound_dev_if = dev->ifindex;
800c5eb7
UB		 771 iucv->hs_dev = dev;
772 dev_hold(dev);
3881ac44
UB		 773 sk->sk_state = IUCV_BOUND;
774 iucv->transport = AF_IUCV_TRANS_HIPER;
775 if (!iucv->msglimit)
776 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
777 rcu_read_unlock();
778 goto done_unlock;
779 }
780 }
781 rcu_read_unlock();
782vm_bind:
783 if (pr_iucv) {
784 /* use local userid for backward compat */
785 memcpy(iucv->src_name, sa->siucv_name, 8);
786 memcpy(iucv->src_user_id, iucv_userid, 8);
787 sk->sk_state = IUCV_BOUND;
788 iucv->transport = AF_IUCV_TRANS_IUCV;
fdbf6326 789 sk->sk_allocation |= GFP_DMA;
3881ac44
UB		 790 if (!iucv->msglimit)
791 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
792 goto done_unlock;
793 }
794 /* found no dev to bind */
795 err = -ENODEV;
eac3731b
JH		 796done_unlock:
797 /* Release the socket list lock */
798 write_unlock_bh(&iucv_sk_list.lock);
799done:
800 release_sock(sk);
801 return err;
802}
803
804/* Automatically bind an unbound socket */
805static int iucv_sock_autobind(struct sock *sk)
806{
807 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 808 int err = 0;
809
aac6399c 810 if (unlikely(!pr_iucv))
eac3731b
JH		 811 return -EPROTO;
812
aac6399c 813 memcpy(iucv->src_user_id, iucv_userid, 8);
fdbf6326
JW		 814 iucv->transport = AF_IUCV_TRANS_IUCV;
815 sk->sk_allocation |= GFP_DMA;
eac3731b
JH		 816
817 write_lock_bh(&iucv_sk_list.lock);
53a4b499 818 __iucv_auto_name(iucv);
eac3731b
JH		 819 write_unlock_bh(&iucv_sk_list.lock);
820
3881ac44
UB		 821 if (!iucv->msglimit)
822 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
823
eac3731b
JH		 824 return err;
825}
826
3881ac44 827static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
eac3731b
JH		 828{
829 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
830 struct sock *sk = sock->sk;
493d3971 831 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 832 unsigned char user_data[16];
833 int err;
834
eac3731b 835 high_nmcpy(user_data, sa->siucv_name);
493d3971 836 low_nmcpy(user_data, iucv->src_name);
eac3731b
JH		 837 ASCEBC(user_data, sizeof(user_data));
838
eac3731b 839 /* Create path. */
09488e2e 840 iucv->path = iucv_path_alloc(iucv->msglimit,
b8942e3b 841 IUCV_IPRMDATA, GFP_KERNEL);
d4444722
UB		 842 if (!iucv->path) {
843 err = -ENOMEM;
844 goto done;
845 }
6fcd61f7
FB		 846 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
847 sa->siucv_user_id, NULL, user_data,
848 sk);
eac3731b
JH		 849 if (err) {
850 iucv_path_free(iucv->path);
851 iucv->path = NULL;
55cdea9e
HB		 852 switch (err) {
853 case 0x0b: /* Target communicator is not logged on */
854 err = -ENETUNREACH;
855 break;
856 case 0x0d: /* Max connections for this guest exceeded */
857 case 0x0e: /* Max connections for target guest exceeded */
858 err = -EAGAIN;
859 break;
860 case 0x0f: /* Missing IUCV authorization */
861 err = -EACCES;
862 break;
863 default:
864 err = -ECONNREFUSED;
865 break;
866 }
eac3731b 867 }
3881ac44
UB		 868done:
869 return err;
870}
eac3731b 871
3881ac44
UB		 872/* Connect an unconnected socket */
873static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
874 int alen, int flags)
875{
876 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
877 struct sock *sk = sock->sk;
878 struct iucv_sock *iucv = iucv_sk(sk);
879 int err;
880
e3c42b61 881 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
3881ac44
UB		 882 return -EINVAL;
883
884 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
885 return -EBADFD;
886
887 if (sk->sk_state == IUCV_OPEN &&
888 iucv->transport == AF_IUCV_TRANS_HIPER)
889 return -EBADFD; /* explicit bind required */
890
891 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
892 return -EINVAL;
893
894 if (sk->sk_state == IUCV_OPEN) {
895 err = iucv_sock_autobind(sk);
896 if (unlikely(err))
897 return err;
898 }
899
900 lock_sock(sk);
901
902 /* Set the destination information */
903 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
904 memcpy(iucv->dst_name, sa->siucv_name, 8);
905
906 if (iucv->transport == AF_IUCV_TRANS_HIPER)
9fbd87d4 907 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
3881ac44
UB		 908 else
909 err = afiucv_path_connect(sock, addr);
910 if (err)
911 goto done;
912
913 if (sk->sk_state != IUCV_CONNECTED)
0ea920d2
HB		 914 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
915 IUCV_DISCONN),
916 sock_sndtimeo(sk, flags & O_NONBLOCK));
eac3731b 917
3881ac44 918 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
b8942e3b 919 err = -ECONNREFUSED;
18becbc5 920
7d316b94
UB		 921 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
922 iucv_sever_path(sk, 0);
18becbc5 923
eac3731b
JH		 924done:
925 release_sock(sk);
926 return err;
927}
928
929/* Move a socket into listening state. */
930static int iucv_sock_listen(struct socket *sock, int backlog)
931{
932 struct sock *sk = sock->sk;
933 int err;
934
935 lock_sock(sk);
936
937 err = -EINVAL;
aa8e71f5
HB		 938 if (sk->sk_state != IUCV_BOUND)
939 goto done;
940
941 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
eac3731b
JH		 942 goto done;
943
944 sk->sk_max_ack_backlog = backlog;
945 sk->sk_ack_backlog = 0;
946 sk->sk_state = IUCV_LISTEN;
947 err = 0;
948
949done:
950 release_sock(sk);
951 return err;
952}
953
954/* Accept a pending connection */
955static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
cdfbabfb 956 int flags, bool kern)
eac3731b
JH		 957{
958 DECLARE_WAITQUEUE(wait, current);
959 struct sock *sk = sock->sk, *nsk;
960 long timeo;
961 int err = 0;
962
561e0360 963 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
eac3731b
JH		 964
965 if (sk->sk_state != IUCV_LISTEN) {
966 err = -EBADFD;
967 goto done;
968 }
969
970 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
971
972 /* Wait for an incoming connection */
aa395145 973 add_wait_queue_exclusive(sk_sleep(sk), &wait);
da99f056 974 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
eac3731b
JH		 975 set_current_state(TASK_INTERRUPTIBLE);
976 if (!timeo) {
977 err = -EAGAIN;
978 break;
979 }
980
981 release_sock(sk);
982 timeo = schedule_timeout(timeo);
561e0360 983 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
eac3731b
JH		 984
985 if (sk->sk_state != IUCV_LISTEN) {
986 err = -EBADFD;
987 break;
988 }
989
990 if (signal_pending(current)) {
991 err = sock_intr_errno(timeo);
992 break;
993 }
994 }
995
996 set_current_state(TASK_RUNNING);
aa395145 997 remove_wait_queue(sk_sleep(sk), &wait);
eac3731b
JH		 998
999 if (err)
1000 goto done;
1001
1002 newsock->state = SS_CONNECTED;
1003
1004done:
1005 release_sock(sk);
1006 return err;
1007}
1008
1009static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
9b2c45d4 1010 int peer)
eac3731b
JH		 1011{
1012 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
1013 struct sock *sk = sock->sk;
493d3971 1014 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 1015
1016 addr->sa_family = AF_IUCV;
eac3731b
JH		 1017
1018 if (peer) {
493d3971
UB		 1019 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1020 memcpy(siucv->siucv_name, iucv->dst_name, 8);
eac3731b 1021 } else {
493d3971
UB		 1022 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1023 memcpy(siucv->siucv_name, iucv->src_name, 8);
eac3731b
JH		 1024 }
1025 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1026 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
493d3971 1027 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
eac3731b 1028
9b2c45d4 1029 return sizeof(struct sockaddr_iucv);
eac3731b
JH		 1030}
1031
b8942e3b
HB		 1032/**
1033 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1034 * @path: IUCV path
1035 * @msg: Pointer to a struct iucv_message
1036 * @skb: The socket data to send, skb->len MUST BE <= 7
1037 *
1038 * Send the socket data in the parameter list in the iucv message
1039 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1040 * list and the socket data len at index 7 (last byte).
1041 * See also iucv_msg_length().
1042 *
1043 * Returns the error code from the iucv_message_send() call.
1044 */
1045static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1046 struct sk_buff *skb)
1047{
1048 u8 prmdata[8];
1049
1050 memcpy(prmdata, (void *) skb->data, skb->len);
1051 prmdata[7] = 0xff - (u8) skb->len;
6fcd61f7 1052 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
b8942e3b
HB		 1053 (void *) prmdata, 8);
1054}
1055
1b784140
YX		 1056static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1057 size_t len)
eac3731b
JH		 1058{
1059 struct sock *sk = sock->sk;
1060 struct iucv_sock *iucv = iucv_sk(sk);
dc5367bc
JW		 1061 size_t headroom = 0;
1062 size_t linear;
eac3731b 1063 struct sk_buff *skb;
0506eb01 1064 struct iucv_message txmsg = {0};
44b1e6b5
HB		 1065 struct cmsghdr *cmsg;
1066 int cmsg_done;
0ea920d2 1067 long timeo;
8f7c502c
UB		 1068 char user_id[9];
1069 char appl_id[9];
eac3731b 1070 int err;
0ea920d2 1071 int noblock = msg->msg_flags & MSG_DONTWAIT;
eac3731b
JH		 1072
1073 err = sock_error(sk);
1074 if (err)
1075 return err;
1076
1077 if (msg->msg_flags & MSG_OOB)
1078 return -EOPNOTSUPP;
1079
aa8e71f5
HB		 1080 /* SOCK_SEQPACKET: we do not support segmented records */
1081 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1082 return -EOPNOTSUPP;
1083
eac3731b
JH		 1084 lock_sock(sk);
1085
1086 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1087 err = -EPIPE;
1088 goto out;
1089 }
1090
bb664f49
HB		 1091 /* Return if the socket is not in connected state */
1092 if (sk->sk_state != IUCV_CONNECTED) {
1093 err = -ENOTCONN;
1094 goto out;
1095 }
44b1e6b5 1096
bb664f49
HB		 1097 /* initialize defaults */
1098 cmsg_done = 0; /* check for duplicate headers */
1099 txmsg.class = 0;
44b1e6b5 1100
bb664f49 1101 /* iterate over control messages */
f95b414e 1102 for_each_cmsghdr(cmsg, msg) {
bb664f49
HB		 1103 if (!CMSG_OK(msg, cmsg)) {
1104 err = -EINVAL;
1105 goto out;
1106 }
44b1e6b5 1107
bb664f49
HB		 1108 if (cmsg->cmsg_level != SOL_IUCV)
1109 continue;
44b1e6b5 1110
bb664f49
HB		 1111 if (cmsg->cmsg_type & cmsg_done) {
1112 err = -EINVAL;
1113 goto out;
1114 }
1115 cmsg_done |= cmsg->cmsg_type;
44b1e6b5 1116
bb664f49
HB		 1117 switch (cmsg->cmsg_type) {
1118 case SCM_IUCV_TRGCLS:
1119 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
44b1e6b5
HB		 1120 err = -EINVAL;
1121 goto out;
1122 }
44b1e6b5 1123
bb664f49
HB		 1124 /* set iucv message target class */
1125 memcpy(&txmsg.class,
1126 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
44b1e6b5 1127
bb664f49 1128 break;
44b1e6b5 1129
bb664f49
HB		 1130 default:
1131 err = -EINVAL;
1132 goto out;
44b1e6b5 1133 }
bb664f49 1134 }
44b1e6b5 1135
bb664f49
HB		 1136 /* allocate one skb for each iucv message:
1137 * this is fine for SOCK_SEQPACKET (unless we want to support
1138 * segmented records using the MSG_EOR flag), but
1139 * for SOCK_STREAM we might want to improve it in future */
dc5367bc 1140 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
238965b7
JW		 1141 headroom = sizeof(struct af_iucv_trans_hdr) +
1142 LL_RESERVED_SPACE(iucv->hs_dev);
e5374399
EC		 1143 linear = len;
1144 } else {
dc5367bc
JW		 1145 if (len < PAGE_SIZE) {
1146 linear = len;
1147 } else {
1148 /* In nonlinear "classic" iucv skb,
1149 * reserve space for iucv_array
1150 */
1151 headroom = sizeof(struct iucv_array) *
1152 (MAX_SKB_FRAGS + 1);
1153 linear = PAGE_SIZE - headroom;
1154 }
e5374399
EC		 1155 }
1156 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1157 noblock, &err, 0);
ed4ac422 1158 if (!skb)
bb664f49 1159 goto out;
e5374399
EC		 1160 if (headroom)
1161 skb_reserve(skb, headroom);
1162 skb_put(skb, linear);
1163 skb->len = len;
1164 skb->data_len = len - linear;
1165 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1166 if (err)
bb664f49 1167 goto fail;
eac3731b 1168
0ea920d2
HB		 1169 /* wait if outstanding messages for iucv path has reached */
1170 timeo = sock_sndtimeo(sk, noblock);
1171 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1172 if (err)
1173 goto fail;
eac3731b 1174
0ea920d2
HB		 1175 /* return -ECONNRESET if the socket is no longer connected */
1176 if (sk->sk_state != IUCV_CONNECTED) {
1177 err = -ECONNRESET;
1178 goto fail;
1179 }
b8942e3b 1180
bb664f49
HB		 1181 /* increment and save iucv message tag for msg_completion cbk */
1182 txmsg.tag = iucv->send_tag++;
f9c41a62 1183 IUCV_SKB_CB(skb)->tag = txmsg.tag;
800c5eb7 1184
3881ac44
UB		 1185 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1186 atomic_inc(&iucv->msg_sent);
1187 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1188 if (err) {
1189 atomic_dec(&iucv->msg_sent);
b2f54394 1190 goto out;
3881ac44 1191 }
e5374399
EC		 1192 } else { /* Classic VM IUCV transport */
1193 skb_queue_tail(&iucv->send_skb_q, skb);
1194
1195 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1196 skb->len <= 7) {
1197 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1198
1199 /* on success: there is no message_complete callback */
1200 /* for an IPRMDATA msg; remove skb from send queue */
1201 if (err == 0) {
1202 skb_unlink(skb, &iucv->send_skb_q);
1203 kfree_skb(skb);
1204 }
b8942e3b 1205
e5374399
EC		 1206 /* this error should never happen since the */
1207 /* IUCV_IPRMDATA path flag is set... sever path */
1208 if (err == 0x15) {
1209 pr_iucv->path_sever(iucv->path, NULL);
1210 skb_unlink(skb, &iucv->send_skb_q);
1211 err = -EPIPE;
1212 goto fail;
1213 }
1214 } else if (skb_is_nonlinear(skb)) {
1215 struct iucv_array *iba = (struct iucv_array *)skb->head;
1216 int i;
1217
1218 /* skip iucv_array lying in the headroom */
1219 iba[0].address = (u32)(addr_t)skb->data;
1220 iba[0].length = (u32)skb_headlen(skb);
1221 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1222 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1223
1224 iba[i + 1].address =
1225 (u32)(addr_t)skb_frag_address(frag);
1226 iba[i + 1].length = (u32)skb_frag_size(frag);
1227 }
1228 err = pr_iucv->message_send(iucv->path, &txmsg,
1229 IUCV_IPBUFLST, 0,
1230 (void *)iba, skb->len);
1231 } else { /* non-IPRM Linear skb */
1232 err = pr_iucv->message_send(iucv->path, &txmsg,
1233 0, 0, (void *)skb->data, skb->len);
bb664f49 1234 }
e5374399
EC		 1235 if (err) {
1236 if (err == 3) {
1237 user_id[8] = 0;
1238 memcpy(user_id, iucv->dst_user_id, 8);
1239 appl_id[8] = 0;
1240 memcpy(appl_id, iucv->dst_name, 8);
1241 pr_err(
1242 "Application %s on z/VM guest %s exceeds message limit\n",
1243 appl_id, user_id);
1244 err = -EAGAIN;
1245 } else {
1246 err = -EPIPE;
1247 }
eac3731b 1248 skb_unlink(skb, &iucv->send_skb_q);
eac3731b
JH		 1249 goto fail;
1250 }
eac3731b
JH		 1251 }
1252
1253 release_sock(sk);
1254 return len;
1255
1256fail:
1257 kfree_skb(skb);
1258out:
1259 release_sock(sk);
1260 return err;
1261}
1262
a006353a
EC		 1263static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1264{
1265 size_t headroom, linear;
1266 struct sk_buff *skb;
1267 int err;
1268
1269 if (len < PAGE_SIZE) {
1270 headroom = 0;
1271 linear = len;
1272 } else {
1273 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1274 linear = PAGE_SIZE - headroom;
1275 }
1276 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1277 0, &err, GFP_ATOMIC | GFP_DMA);
1278 WARN_ONCE(!skb,
1279 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1280 len, err);
1281 if (skb) {
1282 if (headroom)
1283 skb_reserve(skb, headroom);
1284 skb_put(skb, linear);
1285 skb->len = len;
1286 skb->data_len = len - linear;
1287 }
1288 return skb;
1289}
1290
bf95d20f
HB		 1291/* iucv_process_message() - Receive a single outstanding IUCV message
1292 *
1293 * Locking: must be called with message_q.lock held
1294 */
f0703c80
UB		 1295static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1296 struct iucv_path *path,
1297 struct iucv_message *msg)
1298{
1299 int rc;
b8942e3b
HB		 1300 unsigned int len;
1301
1302 len = iucv_msg_length(msg);
f0703c80 1303
44b1e6b5
HB		 1304 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1305 /* Note: the first 4 bytes are reserved for msg tag */
f9c41a62 1306 IUCV_SKB_CB(skb)->class = msg->class;
44b1e6b5 1307
b8942e3b
HB		 1308 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1309 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1310 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1311 skb->data = NULL;
1312 skb->len = 0;
1313 }
f0703c80 1314 } else {
a006353a
EC		 1315 if (skb_is_nonlinear(skb)) {
1316 struct iucv_array *iba = (struct iucv_array *)skb->head;
1317 int i;
1318
1319 iba[0].address = (u32)(addr_t)skb->data;
1320 iba[0].length = (u32)skb_headlen(skb);
1321 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1322 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1323
1324 iba[i + 1].address =
1325 (u32)(addr_t)skb_frag_address(frag);
1326 iba[i + 1].length = (u32)skb_frag_size(frag);
1327 }
1328 rc = pr_iucv->message_receive(path, msg,
1329 IUCV_IPBUFLST,
1330 (void *)iba, len, NULL);
1331 } else {
1332 rc = pr_iucv->message_receive(path, msg,
6fcd61f7
FB		 1333 msg->flags & IUCV_IPRMDATA,
1334 skb->data, len, NULL);
a006353a 1335 }
f0703c80
UB		 1336 if (rc) {
1337 kfree_skb(skb);
1338 return;
1339 }
a006353a 1340 WARN_ON_ONCE(skb->len != len);
f0703c80
UB		 1341 }
1342
f9c41a62 1343 IUCV_SKB_CB(skb)->offset = 0;
8c68b1a0
UB		 1344 if (sk_filter(sk, skb)) {
1345 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1346 kfree_skb(skb);
1347 return;
1348 }
1349 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1350 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
f0703c80
UB		 1351}
1352
bf95d20f
HB		 1353/* iucv_process_message_q() - Process outstanding IUCV messages
1354 *
1355 * Locking: must be called with message_q.lock held
1356 */
f0703c80
UB		 1357static void iucv_process_message_q(struct sock *sk)
1358{
1359 struct iucv_sock *iucv = iucv_sk(sk);
1360 struct sk_buff *skb;
1361 struct sock_msg_q *p, *n;
1362
1363 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
a006353a 1364 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
f0703c80
UB		 1365 if (!skb)
1366 break;
1367 iucv_process_message(sk, skb, p->path, &p->msg);
1368 list_del(&p->list);
1369 kfree(p);
1370 if (!skb_queue_empty(&iucv->backlog_skb_q))
1371 break;
1372 }
1373}
1374
1b784140
YX		 1375static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1376 size_t len, int flags)
eac3731b
JH		 1377{
1378 int noblock = flags & MSG_DONTWAIT;
1379 struct sock *sk = sock->sk;
561e0360 1380 struct iucv_sock *iucv = iucv_sk(sk);
aa8e71f5 1381 unsigned int copied, rlen;
9fbd87d4 1382 struct sk_buff *skb, *rskb, *cskb;
eac3731b 1383 int err = 0;
f9c41a62 1384 u32 offset;
eac3731b 1385
aac6399c 1386 if ((sk->sk_state == IUCV_DISCONN) &&
f0703c80
UB		 1387 skb_queue_empty(&iucv->backlog_skb_q) &&
1388 skb_queue_empty(&sk->sk_receive_queue) &&
1389 list_empty(&iucv->message_q.list))
561e0360
JH		 1390 return 0;
1391
eac3731b
JH		 1392 if (flags & (MSG_OOB))
1393 return -EOPNOTSUPP;
1394
60d3705f
HB		 1395 /* receive/dequeue next skb:
1396 * the function understands MSG_PEEK and, thus, does not dequeue skb */
eac3731b
JH		 1397 skb = skb_recv_datagram(sk, flags, noblock, &err);
1398 if (!skb) {
1399 if (sk->sk_shutdown & RCV_SHUTDOWN)
1400 return 0;
1401 return err;
1402 }
1403
f9c41a62
UB		 1404 offset = IUCV_SKB_CB(skb)->offset;
1405 rlen = skb->len - offset; /* real length of skb */
aa8e71f5 1406 copied = min_t(unsigned int, rlen, len);
82492a35
UB		 1407 if (!rlen)
1408 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
eac3731b 1409
561e0360 1410 cskb = skb;
51f3d02b 1411 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
802788bf
HB		 1412 if (!(flags & MSG_PEEK))
1413 skb_queue_head(&sk->sk_receive_queue, skb);
1414 return -EFAULT;
eac3731b
JH		 1415 }
1416
aa8e71f5
HB		 1417 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1418 if (sk->sk_type == SOCK_SEQPACKET) {
1419 if (copied < rlen)
1420 msg->msg_flags |= MSG_TRUNC;
1421 /* each iucv message contains a complete record */
1422 msg->msg_flags |= MSG_EOR;
1423 }
eac3731b 1424
44b1e6b5
HB		 1425 /* create control message to store iucv msg target class:
1426 * get the trgcls from the control buffer of the skb due to
1427 * fragmentation of original iucv message. */
1428 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
f9c41a62
UB		 1429 sizeof(IUCV_SKB_CB(skb)->class),
1430 (void *)&IUCV_SKB_CB(skb)->class);
44b1e6b5
HB		 1431 if (err) {
1432 if (!(flags & MSG_PEEK))
1433 skb_queue_head(&sk->sk_receive_queue, skb);
1434 return err;
1435 }
1436
eac3731b
JH		 1437 /* Mark read part of skb as used */
1438 if (!(flags & MSG_PEEK)) {
eac3731b 1439
aa8e71f5
HB		 1440 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1441 if (sk->sk_type == SOCK_STREAM) {
f9c41a62
UB		 1442 if (copied < rlen) {
1443 IUCV_SKB_CB(skb)->offset = offset + copied;
2f139a5d 1444 skb_queue_head(&sk->sk_receive_queue, skb);
aa8e71f5
HB		 1445 goto done;
1446 }
eac3731b
JH		 1447 }
1448
1449 kfree_skb(skb);
800c5eb7
UB		 1450 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1451 atomic_inc(&iucv->msg_recv);
1452 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1453 WARN_ON(1);
1454 iucv_sock_close(sk);
1455 return -EFAULT;
1456 }
1457 }
561e0360
JH		 1458
1459 /* Queue backlog skbs */
bf95d20f 1460 spin_lock_bh(&iucv->message_q.lock);
f0703c80 1461 rskb = skb_dequeue(&iucv->backlog_skb_q);
da99f056 1462 while (rskb) {
f9c41a62 1463 IUCV_SKB_CB(rskb)->offset = 0;
8c68b1a0
UB		 1464 if (__sock_queue_rcv_skb(sk, rskb)) {
1465 /* handle rcv queue full */
f0703c80 1466 skb_queue_head(&iucv->backlog_skb_q,
561e0360
JH		 1467 rskb);
1468 break;
561e0360 1469 }
8c68b1a0 1470 rskb = skb_dequeue(&iucv->backlog_skb_q);
561e0360 1471 }
f0703c80 1472 if (skb_queue_empty(&iucv->backlog_skb_q)) {
f0703c80
UB		 1473 if (!list_empty(&iucv->message_q.list))
1474 iucv_process_message_q(sk);
3881ac44
UB		 1475 if (atomic_read(&iucv->msg_recv) >=
1476 iucv->msglimit / 2) {
9fbd87d4 1477 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
3881ac44
UB		 1478 if (err) {
1479 sk->sk_state = IUCV_DISCONN;
1480 sk->sk_state_change(sk);
1481 }
1482 }
f0703c80 1483 }
bf95d20f 1484 spin_unlock_bh(&iucv->message_q.lock);
60d3705f 1485 }
eac3731b
JH		 1486
1487done:
aa8e71f5
HB		 1488 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1489 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1490 copied = rlen;
1491
1492 return copied;
eac3731b
JH		 1493}
1494
ade994f4 1495static inline __poll_t iucv_accept_poll(struct sock *parent)
eac3731b
JH		 1496{
1497 struct iucv_sock *isk, *n;
1498 struct sock *sk;
1499
da99f056 1500 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
eac3731b
JH		 1501 sk = (struct sock *) isk;
1502
1503 if (sk->sk_state == IUCV_CONNECTED)
a9a08845 1504 return EPOLLIN | EPOLLRDNORM;
eac3731b
JH		 1505 }
1506
1507 return 0;
1508}
1509
a11e1d43
LT		 1510__poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1511 poll_table *wait)
eac3731b
JH		 1512{
1513 struct sock *sk = sock->sk;
ade994f4 1514 __poll_t mask = 0;
eac3731b 1515
89ab066d 1516 sock_poll_wait(file, sock, wait);
a11e1d43 1517
eac3731b
JH		 1518 if (sk->sk_state == IUCV_LISTEN)
1519 return iucv_accept_poll(sk);
1520
1521 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
a9a08845
LT		 1522 mask |= EPOLLERR |
1523 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
eac3731b
JH		 1524
1525 if (sk->sk_shutdown & RCV_SHUTDOWN)
a9a08845 1526 mask |= EPOLLRDHUP;
eac3731b
JH		 1527
1528 if (sk->sk_shutdown == SHUTDOWN_MASK)
a9a08845 1529 mask |= EPOLLHUP;
eac3731b
JH		 1530
1531 if (!skb_queue_empty(&sk->sk_receive_queue) ||
da99f056 1532 (sk->sk_shutdown & RCV_SHUTDOWN))
a9a08845 1533 mask |= EPOLLIN | EPOLLRDNORM;
eac3731b
JH		 1534
1535 if (sk->sk_state == IUCV_CLOSED)
a9a08845 1536 mask |= EPOLLHUP;
eac3731b 1537
aac6399c 1538 if (sk->sk_state == IUCV_DISCONN)
a9a08845 1539 mask |= EPOLLIN;
561e0360 1540
7f1b0ea4 1541 if (sock_writeable(sk) && iucv_below_msglim(sk))
a9a08845 1542 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
eac3731b 1543 else
9cd3e072 1544 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
eac3731b
JH		 1545
1546 return mask;
1547}
1548
1549static int iucv_sock_shutdown(struct socket *sock, int how)
1550{
1551 struct sock *sk = sock->sk;
1552 struct iucv_sock *iucv = iucv_sk(sk);
1553 struct iucv_message txmsg;
1554 int err = 0;
eac3731b
JH		 1555
1556 how++;
1557
1558 if ((how & ~SHUTDOWN_MASK) || !how)
1559 return -EINVAL;
1560
1561 lock_sock(sk);
da99f056 1562 switch (sk->sk_state) {
82492a35 1563 case IUCV_LISTEN:
e14ad5fa
HB		 1564 case IUCV_DISCONN:
1565 case IUCV_CLOSING:
eac3731b
JH		 1566 case IUCV_CLOSED:
1567 err = -ENOTCONN;
1568 goto fail;
eac3731b 1569 default:
eac3731b
JH		 1570 break;
1571 }
1572
1573 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
82492a35
UB		 1574 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1575 txmsg.class = 0;
1576 txmsg.tag = 0;
1577 err = pr_iucv->message_send(iucv->path, &txmsg,
1578 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1579 if (err) {
1580 switch (err) {
1581 case 1:
1582 err = -ENOTCONN;
1583 break;
1584 case 2:
1585 err = -ECONNRESET;
1586 break;
1587 default:
1588 err = -ENOTCONN;
1589 break;
1590 }
eac3731b 1591 }
82492a35
UB		 1592 } else
1593 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
eac3731b
JH		 1594 }
1595
82492a35 1596 sk->sk_shutdown |= how;
eac3731b 1597 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1042cab8
UB		 1598 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1599 iucv->path) {
82492a35
UB		 1600 err = pr_iucv->path_quiesce(iucv->path, NULL);
1601 if (err)
1602 err = -ENOTCONN;
1603/* skb_queue_purge(&sk->sk_receive_queue); */
1604 }
eac3731b
JH		 1605 skb_queue_purge(&sk->sk_receive_queue);
1606 }
1607
1608 /* Wake up anyone sleeping in poll */
1609 sk->sk_state_change(sk);
1610
1611fail:
1612 release_sock(sk);
1613 return err;
1614}
1615
1616static int iucv_sock_release(struct socket *sock)
1617{
1618 struct sock *sk = sock->sk;
1619 int err = 0;
1620
1621 if (!sk)
1622 return 0;
1623
1624 iucv_sock_close(sk);
1625
eac3731b
JH		 1626 sock_orphan(sk);
1627 iucv_sock_kill(sk);
1628 return err;
1629}
1630
9d5c5d8f
HB		 1631/* getsockopt and setsockopt */
1632static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 1633 char __user *optval, unsigned int optlen)
9d5c5d8f
HB		 1634{
1635 struct sock *sk = sock->sk;
1636 struct iucv_sock *iucv = iucv_sk(sk);
1637 int val;
1638 int rc;
1639
1640 if (level != SOL_IUCV)
1641 return -ENOPROTOOPT;
1642
1643 if (optlen < sizeof(int))
1644 return -EINVAL;
1645
1646 if (get_user(val, (int __user *) optval))
1647 return -EFAULT;
1648
1649 rc = 0;
1650
1651 lock_sock(sk);
1652 switch (optname) {
1653 case SO_IPRMDATA_MSG:
1654 if (val)
1655 iucv->flags |= IUCV_IPRMDATA;
1656 else
1657 iucv->flags &= ~IUCV_IPRMDATA;
1658 break;
09488e2e
HB		 1659 case SO_MSGLIMIT:
1660 switch (sk->sk_state) {
1661 case IUCV_OPEN:
1662 case IUCV_BOUND:
1663 if (val < 1 || val > (u16)(~0))
1664 rc = -EINVAL;
1665 else
1666 iucv->msglimit = val;
1667 break;
1668 default:
1669 rc = -EINVAL;
1670 break;
1671 }
1672 break;
9d5c5d8f
HB		 1673 default:
1674 rc = -ENOPROTOOPT;
1675 break;
1676 }
1677 release_sock(sk);
1678
1679 return rc;
1680}
1681
1682static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1683 char __user *optval, int __user *optlen)
1684{
1685 struct sock *sk = sock->sk;
1686 struct iucv_sock *iucv = iucv_sk(sk);
51363b87
UB		 1687 unsigned int val;
1688 int len;
9d5c5d8f
HB		 1689
1690 if (level != SOL_IUCV)
1691 return -ENOPROTOOPT;
1692
1693 if (get_user(len, optlen))
1694 return -EFAULT;
1695
1696 if (len < 0)
1697 return -EINVAL;
1698
1699 len = min_t(unsigned int, len, sizeof(int));
1700
1701 switch (optname) {
1702 case SO_IPRMDATA_MSG:
1703 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1704 break;
09488e2e
HB		 1705 case SO_MSGLIMIT:
1706 lock_sock(sk);
1707 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1708 : iucv->msglimit; /* default */
1709 release_sock(sk);
1710 break;
51363b87
UB		 1711 case SO_MSGSIZE:
1712 if (sk->sk_state == IUCV_OPEN)
1713 return -EBADFD;
1714 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1715 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1716 0x7fffffff;
1717 break;
9d5c5d8f
HB		 1718 default:
1719 return -ENOPROTOOPT;
1720 }
1721
1722 if (put_user(len, optlen))
1723 return -EFAULT;
1724 if (copy_to_user(optval, &val, len))
1725 return -EFAULT;
1726
1727 return 0;
1728}
1729
1730
eac3731b
JH		 1731/* Callback wrappers - called from iucv base support */
1732static int iucv_callback_connreq(struct iucv_path *path,
1733 u8 ipvmid[8], u8 ipuser[16])
1734{
1735 unsigned char user_data[16];
1736 unsigned char nuser_data[16];
1737 unsigned char src_name[8];
eac3731b
JH		 1738 struct sock *sk, *nsk;
1739 struct iucv_sock *iucv, *niucv;
1740 int err;
1741
1742 memcpy(src_name, ipuser, 8);
1743 EBCASC(src_name, 8);
1744 /* Find out if this path belongs to af_iucv. */
1745 read_lock(&iucv_sk_list.lock);
1746 iucv = NULL;
febca281 1747 sk = NULL;
b67bfe0d 1748 sk_for_each(sk, &iucv_sk_list.head)
eac3731b
JH		 1749 if (sk->sk_state == IUCV_LISTEN &&
1750 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1751 /*
1752 * Found a listening socket with
1753 * src_name == ipuser[0-7].
1754 */
1755 iucv = iucv_sk(sk);
1756 break;
1757 }
1758 read_unlock(&iucv_sk_list.lock);
1759 if (!iucv)
1760 /* No socket found, not one of our paths. */
1761 return -EINVAL;
1762
1763 bh_lock_sock(sk);
1764
1765 /* Check if parent socket is listening */
1766 low_nmcpy(user_data, iucv->src_name);
1767 high_nmcpy(user_data, iucv->dst_name);
1768 ASCEBC(user_data, sizeof(user_data));
1769 if (sk->sk_state != IUCV_LISTEN) {
6fcd61f7 1770 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1771 iucv_path_free(path);
eac3731b
JH		 1772 goto fail;
1773 }
1774
1775 /* Check for backlog size */
1776 if (sk_acceptq_is_full(sk)) {
6fcd61f7 1777 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1778 iucv_path_free(path);
eac3731b
JH		 1779 goto fail;
1780 }
1781
1782 /* Create the new socket */
11aa9c28 1783 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
da99f056 1784 if (!nsk) {
6fcd61f7 1785 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1786 iucv_path_free(path);
eac3731b
JH		 1787 goto fail;
1788 }
1789
1790 niucv = iucv_sk(nsk);
1791 iucv_sock_init(nsk, sk);
fdbf6326
JW		 1792 niucv->transport = AF_IUCV_TRANS_IUCV;
1793 nsk->sk_allocation |= GFP_DMA;
eac3731b
JH		 1794
1795 /* Set the new iucv_sock */
1796 memcpy(niucv->dst_name, ipuser + 8, 8);
1797 EBCASC(niucv->dst_name, 8);
1798 memcpy(niucv->dst_user_id, ipvmid, 8);
1799 memcpy(niucv->src_name, iucv->src_name, 8);
1800 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1801 niucv->path = path;
1802
1803 /* Call iucv_accept */
1804 high_nmcpy(nuser_data, ipuser + 8);
1805 memcpy(nuser_data + 8, niucv->src_name, 8);
1806 ASCEBC(nuser_data + 8, 8);
1807
09488e2e
HB		 1808 /* set message limit for path based on msglimit of accepting socket */
1809 niucv->msglimit = iucv->msglimit;
1810 path->msglim = iucv->msglimit;
6fcd61f7 1811 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
da99f056 1812 if (err) {
7d316b94 1813 iucv_sever_path(nsk, 1);
65dbd7c2 1814 iucv_sock_kill(nsk);
eac3731b
JH		 1815 goto fail;
1816 }
1817
1818 iucv_accept_enqueue(sk, nsk);
1819
1820 /* Wake up accept */
1821 nsk->sk_state = IUCV_CONNECTED;
676d2369 1822 sk->sk_data_ready(sk);
eac3731b
JH		 1823 err = 0;
1824fail:
1825 bh_unlock_sock(sk);
1826 return 0;
1827}
1828
1829static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1830{
1831 struct sock *sk = path->private;
1832
1833 sk->sk_state = IUCV_CONNECTED;
1834 sk->sk_state_change(sk);
1835}
1836
1837static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1838{
1839 struct sock *sk = path->private;
561e0360 1840 struct iucv_sock *iucv = iucv_sk(sk);
f0703c80
UB		 1841 struct sk_buff *skb;
1842 struct sock_msg_q *save_msg;
1843 int len;
561e0360 1844
fe86e54e 1845 if (sk->sk_shutdown & RCV_SHUTDOWN) {
6fcd61f7 1846 pr_iucv->message_reject(path, msg);
eac3731b 1847 return;
fe86e54e 1848 }
eac3731b 1849
3fa6b5ad 1850 spin_lock(&iucv->message_q.lock);
eac3731b 1851
f0703c80
UB		 1852 if (!list_empty(&iucv->message_q.list) ||
1853 !skb_queue_empty(&iucv->backlog_skb_q))
1854 goto save_message;
1855
1856 len = atomic_read(&sk->sk_rmem_alloc);
87fb4b7b 1857 len += SKB_TRUESIZE(iucv_msg_length(msg));
f0703c80
UB		 1858 if (len > sk->sk_rcvbuf)
1859 goto save_message;
1860
a006353a 1861 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
f0703c80
UB		 1862 if (!skb)
1863 goto save_message;
eac3731b 1864
f0703c80 1865 iucv_process_message(sk, skb, path, msg);
3fa6b5ad 1866 goto out_unlock;
eac3731b 1867
f0703c80
UB		 1868save_message:
1869 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
d4444722 1870 if (!save_msg)
a56635a5 1871 goto out_unlock;
f0703c80
UB		 1872 save_msg->path = path;
1873 save_msg->msg = *msg;
eac3731b 1874
f0703c80 1875 list_add_tail(&save_msg->list, &iucv->message_q.list);
3fa6b5ad
HB		 1876
1877out_unlock:
f0703c80 1878 spin_unlock(&iucv->message_q.lock);
eac3731b
JH		 1879}
1880
1881static void iucv_callback_txdone(struct iucv_path *path,
1882 struct iucv_message *msg)
1883{
1884 struct sock *sk = path->private;
f2a77991 1885 struct sk_buff *this = NULL;
eac3731b 1886 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
9e733177 1887 struct sk_buff *list_skb;
eac3731b
JH		 1888 unsigned long flags;
1889
7d316b94 1890 bh_lock_sock(sk);
561e0360 1891
9e733177
DM		 1892 spin_lock_irqsave(&list->lock, flags);
1893 skb_queue_walk(list, list_skb) {
1894 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1895 this = list_skb;
1896 break;
f2a77991 1897 }
9e733177
DM		 1898 }
1899 if (this)
1900 __skb_unlink(this, list);
1901 spin_unlock_irqrestore(&list->lock, flags);
eac3731b 1902
9e733177
DM		 1903 if (this) {
1904 kfree_skb(this);
1905 /* wake up any process waiting for sending */
1906 iucv_sock_wake_msglim(sk);
561e0360 1907 }
eac3731b 1908
da99f056 1909 if (sk->sk_state == IUCV_CLOSING) {
561e0360
JH		 1910 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1911 sk->sk_state = IUCV_CLOSED;
1912 sk->sk_state_change(sk);
1913 }
1914 }
7d316b94 1915 bh_unlock_sock(sk);
eac3731b 1916
eac3731b
JH		 1917}
1918
1919static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1920{
1921 struct sock *sk = path->private;
1922
7d316b94
UB		 1923 if (sk->sk_state == IUCV_CLOSED)
1924 return;
1925
1926 bh_lock_sock(sk);
1927 iucv_sever_path(sk, 1);
aac6399c 1928 sk->sk_state = IUCV_DISCONN;
eac3731b
JH		 1929
1930 sk->sk_state_change(sk);
7d316b94 1931 bh_unlock_sock(sk);
eac3731b
JH		 1932}
1933
af88b52d
HB		 1934/* called if the other communication side shuts down its RECV direction;
1935 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1936 */
1937static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1938{
1939 struct sock *sk = path->private;
1940
1941 bh_lock_sock(sk);
1942 if (sk->sk_state != IUCV_CLOSED) {
1943 sk->sk_shutdown |= SEND_SHUTDOWN;
1944 sk->sk_state_change(sk);
1945 }
1946 bh_unlock_sock(sk);
1947}
1948
3881ac44
UB		 1949/***************** HiperSockets transport callbacks ********************/
1950static void afiucv_swap_src_dest(struct sk_buff *skb)
1951{
cd11d112 1952 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
3881ac44
UB		 1953 char tmpID[8];
1954 char tmpName[8];
1955
1956 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1957 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1958 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1959 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1960 memcpy(tmpID, trans_hdr->srcUserID, 8);
1961 memcpy(tmpName, trans_hdr->srcAppName, 8);
1962 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1963 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1964 memcpy(trans_hdr->destUserID, tmpID, 8);
1965 memcpy(trans_hdr->destAppName, tmpName, 8);
1966 skb_push(skb, ETH_HLEN);
1967 memset(skb->data, 0, ETH_HLEN);
1968}
1969
1970/**
1971 * afiucv_hs_callback_syn - react on received SYN
1972 **/
1973static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1974{
cd11d112 1975 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
3881ac44
UB		 1976 struct sock *nsk;
1977 struct iucv_sock *iucv, *niucv;
3881ac44
UB		 1978 int err;
1979
1980 iucv = iucv_sk(sk);
3881ac44
UB		 1981 if (!iucv) {
1982 /* no sock - connection refused */
1983 afiucv_swap_src_dest(skb);
1984 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1985 err = dev_queue_xmit(skb);
1986 goto out;
1987 }
1988
11aa9c28 1989 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
3881ac44
UB		 1990 bh_lock_sock(sk);
1991 if ((sk->sk_state != IUCV_LISTEN) ||
1992 sk_acceptq_is_full(sk) ||
1993 !nsk) {
1994 /* error on server socket - connection refused */
3881ac44
UB		 1995 afiucv_swap_src_dest(skb);
1996 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1997 err = dev_queue_xmit(skb);
4d520f62 1998 iucv_sock_kill(nsk);
3881ac44
UB		 1999 bh_unlock_sock(sk);
2000 goto out;
2001 }
2002
2003 niucv = iucv_sk(nsk);
2004 iucv_sock_init(nsk, sk);
2005 niucv->transport = AF_IUCV_TRANS_HIPER;
2006 niucv->msglimit = iucv->msglimit;
2007 if (!trans_hdr->window)
2008 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
2009 else
2010 niucv->msglimit_peer = trans_hdr->window;
2011 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
2012 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2013 memcpy(niucv->src_name, iucv->src_name, 8);
2014 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2015 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
800c5eb7
UB		 2016 niucv->hs_dev = iucv->hs_dev;
2017 dev_hold(niucv->hs_dev);
3881ac44
UB		 2018 afiucv_swap_src_dest(skb);
2019 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2020 trans_hdr->window = niucv->msglimit;
2021 /* if receiver acks the xmit connection is established */
2022 err = dev_queue_xmit(skb);
2023 if (!err) {
2024 iucv_accept_enqueue(sk, nsk);
2025 nsk->sk_state = IUCV_CONNECTED;
676d2369 2026 sk->sk_data_ready(sk);
3881ac44
UB		 2027 } else
2028 iucv_sock_kill(nsk);
2029 bh_unlock_sock(sk);
2030
2031out:
2032 return NET_RX_SUCCESS;
2033}
2034
2035/**
2036 * afiucv_hs_callback_synack() - react on received SYN-ACK
2037 **/
2038static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2039{
2040 struct iucv_sock *iucv = iucv_sk(sk);
3881ac44
UB		 2041
2042 if (!iucv)
2043 goto out;
2044 if (sk->sk_state != IUCV_BOUND)
2045 goto out;
2046 bh_lock_sock(sk);
cd11d112 2047 iucv->msglimit_peer = iucv_trans_hdr(skb)->window;
3881ac44
UB		 2048 sk->sk_state = IUCV_CONNECTED;
2049 sk->sk_state_change(sk);
2050 bh_unlock_sock(sk);
2051out:
2052 kfree_skb(skb);
2053 return NET_RX_SUCCESS;
2054}
2055
2056/**
2057 * afiucv_hs_callback_synfin() - react on received SYN_FIN
2058 **/
2059static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2060{
2061 struct iucv_sock *iucv = iucv_sk(sk);
2062
2063 if (!iucv)
2064 goto out;
2065 if (sk->sk_state != IUCV_BOUND)
2066 goto out;
2067 bh_lock_sock(sk);
2068 sk->sk_state = IUCV_DISCONN;
2069 sk->sk_state_change(sk);
2070 bh_unlock_sock(sk);
2071out:
2072 kfree_skb(skb);
2073 return NET_RX_SUCCESS;
2074}
2075
2076/**
2077 * afiucv_hs_callback_fin() - react on received FIN
2078 **/
2079static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2080{
2081 struct iucv_sock *iucv = iucv_sk(sk);
2082
2083 /* other end of connection closed */
800c5eb7
UB		 2084 if (!iucv)
2085 goto out;
2086 bh_lock_sock(sk);
2087 if (sk->sk_state == IUCV_CONNECTED) {
aac6399c 2088 sk->sk_state = IUCV_DISCONN;
3881ac44 2089 sk->sk_state_change(sk);
3881ac44 2090 }
800c5eb7
UB		 2091 bh_unlock_sock(sk);
2092out:
3881ac44
UB		 2093 kfree_skb(skb);
2094 return NET_RX_SUCCESS;
2095}
2096
2097/**
2098 * afiucv_hs_callback_win() - react on received WIN
2099 **/
2100static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2101{
2102 struct iucv_sock *iucv = iucv_sk(sk);
3881ac44
UB		 2103
2104 if (!iucv)
2105 return NET_RX_SUCCESS;
2106
2107 if (sk->sk_state != IUCV_CONNECTED)
2108 return NET_RX_SUCCESS;
2109
cd11d112 2110 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent);
3881ac44
UB		 2111 iucv_sock_wake_msglim(sk);
2112 return NET_RX_SUCCESS;
2113}
2114
2115/**
2116 * afiucv_hs_callback_rx() - react on received data
2117 **/
2118static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2119{
2120 struct iucv_sock *iucv = iucv_sk(sk);
2121
2122 if (!iucv) {
2123 kfree_skb(skb);
2124 return NET_RX_SUCCESS;
2125 }
2126
2127 if (sk->sk_state != IUCV_CONNECTED) {
2128 kfree_skb(skb);
2129 return NET_RX_SUCCESS;
2130 }
2131
82492a35
UB		 2132 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2133 kfree_skb(skb);
2134 return NET_RX_SUCCESS;
2135 }
2136
979f66b3 2137 /* write stuff from iucv_msg to skb cb */
3881ac44
UB		 2138 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2139 skb_reset_transport_header(skb);
2140 skb_reset_network_header(skb);
f9c41a62 2141 IUCV_SKB_CB(skb)->offset = 0;
8c68b1a0
UB		 2142 if (sk_filter(sk, skb)) {
2143 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2144 kfree_skb(skb);
2145 return NET_RX_SUCCESS;
2146 }
2147
3881ac44
UB		 2148 spin_lock(&iucv->message_q.lock);
2149 if (skb_queue_empty(&iucv->backlog_skb_q)) {
8c68b1a0 2150 if (__sock_queue_rcv_skb(sk, skb))
3881ac44
UB		 2151 /* handle rcv queue full */
2152 skb_queue_tail(&iucv->backlog_skb_q, skb);
3881ac44
UB		 2153 } else
2154 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2155 spin_unlock(&iucv->message_q.lock);
2156 return NET_RX_SUCCESS;
2157}
2158
2159/**
2160 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2161 * transport
2162 * called from netif RX softirq
2163 **/
2164static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2165 struct packet_type *pt, struct net_device *orig_dev)
2166{
3881ac44
UB		 2167 struct sock *sk;
2168 struct iucv_sock *iucv;
2169 struct af_iucv_trans_hdr *trans_hdr;
22244099 2170 int err = NET_RX_SUCCESS;
3881ac44 2171 char nullstring[8];
3881ac44 2172
cd11d112
JW		 2173 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) {
2174 WARN_ONCE(1, "AF_IUCV failed to receive skb, len=%u", skb->len);
979f66b3
EC		 2175 kfree_skb(skb);
2176 return NET_RX_SUCCESS;
2177 }
cd11d112
JW		 2178
2179 trans_hdr = iucv_trans_hdr(skb);
3881ac44
UB		 2180 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2181 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2182 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2183 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2184 memset(nullstring, 0, sizeof(nullstring));
2185 iucv = NULL;
2186 sk = NULL;
2187 read_lock(&iucv_sk_list.lock);
b67bfe0d 2188 sk_for_each(sk, &iucv_sk_list.head) {
3881ac44
UB		 2189 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2190 if ((!memcmp(&iucv_sk(sk)->src_name,
2191 trans_hdr->destAppName, 8)) &&
2192 (!memcmp(&iucv_sk(sk)->src_user_id,
2193 trans_hdr->destUserID, 8)) &&
2194 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2195 (!memcmp(&iucv_sk(sk)->dst_user_id,
2196 nullstring, 8))) {
2197 iucv = iucv_sk(sk);
2198 break;
2199 }
2200 } else {
2201 if ((!memcmp(&iucv_sk(sk)->src_name,
2202 trans_hdr->destAppName, 8)) &&
2203 (!memcmp(&iucv_sk(sk)->src_user_id,
2204 trans_hdr->destUserID, 8)) &&
2205 (!memcmp(&iucv_sk(sk)->dst_name,
2206 trans_hdr->srcAppName, 8)) &&
2207 (!memcmp(&iucv_sk(sk)->dst_user_id,
2208 trans_hdr->srcUserID, 8))) {
2209 iucv = iucv_sk(sk);
2210 break;
2211 }
2212 }
2213 }
2214 read_unlock(&iucv_sk_list.lock);
2215 if (!iucv)
2216 sk = NULL;
2217
2218 /* no sock
2219 how should we send with no sock
2220 1) send without sock no send rc checking?
2221 2) introduce default sock to handle this cases
2222
2223 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2224 data -> send FIN
2225 SYN|ACK, SYN|FIN, FIN -> no action? */
2226
2227 switch (trans_hdr->flags) {
2228 case AF_IUCV_FLAG_SYN:
2229 /* connect request */
2230 err = afiucv_hs_callback_syn(sk, skb);
2231 break;
2232 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2233 /* connect request confirmed */
2234 err = afiucv_hs_callback_synack(sk, skb);
2235 break;
2236 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2237 /* connect request refused */
2238 err = afiucv_hs_callback_synfin(sk, skb);
2239 break;
2240 case (AF_IUCV_FLAG_FIN):
2241 /* close request */
2242 err = afiucv_hs_callback_fin(sk, skb);
2243 break;
2244 case (AF_IUCV_FLAG_WIN):
2245 err = afiucv_hs_callback_win(sk, skb);
800c5eb7
UB		 2246 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2247 kfree_skb(skb);
2248 break;
2249 }
82492a35
UB		 2250 /* fall through and receive non-zero length data */
2251 case (AF_IUCV_FLAG_SHT):
2252 /* shutdown request */
2253 /* fall through and receive zero length data */
3881ac44
UB		 2254 case 0:
2255 /* plain data frame */
f9c41a62 2256 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
3881ac44
UB		 2257 err = afiucv_hs_callback_rx(sk, skb);
2258 break;
2259 default:
22244099 2260 kfree_skb(skb);
3881ac44
UB		 2261 }
2262
2263 return err;
2264}
2265
2266/**
2267 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2268 * transport
2269 **/
2270static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2271 enum iucv_tx_notify n)
2272{
2273 struct sock *isk = skb->sk;
2274 struct sock *sk = NULL;
2275 struct iucv_sock *iucv = NULL;
2276 struct sk_buff_head *list;
2277 struct sk_buff *list_skb;
800c5eb7 2278 struct sk_buff *nskb;
3881ac44 2279 unsigned long flags;
3881ac44 2280
800c5eb7 2281 read_lock_irqsave(&iucv_sk_list.lock, flags);
b67bfe0d 2282 sk_for_each(sk, &iucv_sk_list.head)
3881ac44
UB		 2283 if (sk == isk) {
2284 iucv = iucv_sk(sk);
2285 break;
2286 }
800c5eb7 2287 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
3881ac44 2288
800c5eb7 2289 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
3881ac44
UB		 2290 return;
2291
3881ac44 2292 list = &iucv->send_skb_q;
800c5eb7 2293 spin_lock_irqsave(&list->lock, flags);
9e733177 2294 skb_queue_walk_safe(list, list_skb, nskb) {
3881ac44 2295 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
3881ac44
UB		 2296 switch (n) {
2297 case TX_NOTIFY_OK:
800c5eb7
UB		 2298 __skb_unlink(list_skb, list);
2299 kfree_skb(list_skb);
3881ac44 2300 iucv_sock_wake_msglim(sk);
3881ac44
UB		 2301 break;
2302 case TX_NOTIFY_PENDING:
2303 atomic_inc(&iucv->pendings);
2304 break;
2305 case TX_NOTIFY_DELAYED_OK:
800c5eb7 2306 __skb_unlink(list_skb, list);
3881ac44
UB		 2307 atomic_dec(&iucv->pendings);
2308 if (atomic_read(&iucv->pendings) <= 0)
2309 iucv_sock_wake_msglim(sk);
800c5eb7 2310 kfree_skb(list_skb);
3881ac44
UB		 2311 break;
2312 case TX_NOTIFY_UNREACHABLE:
2313 case TX_NOTIFY_DELAYED_UNREACHABLE:
2314 case TX_NOTIFY_TPQFULL: /* not yet used */
2315 case TX_NOTIFY_GENERALERROR:
2316 case TX_NOTIFY_DELAYED_GENERALERROR:
800c5eb7
UB		 2317 __skb_unlink(list_skb, list);
2318 kfree_skb(list_skb);
2319 if (sk->sk_state == IUCV_CONNECTED) {
2320 sk->sk_state = IUCV_DISCONN;
2321 sk->sk_state_change(sk);
2322 }
3881ac44
UB		 2323 break;
2324 }
2325 break;
2326 }
3881ac44
UB		 2327 }
2328 spin_unlock_irqrestore(&list->lock, flags);
2329
42bd48e0
UB		 2330 if (sk->sk_state == IUCV_CLOSING) {
2331 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2332 sk->sk_state = IUCV_CLOSED;
2333 sk->sk_state_change(sk);
2334 }
2335 }
2336
3881ac44 2337}
9fbd87d4
UB		 2338
2339/*
2340 * afiucv_netdev_event: handle netdev notifier chain events
2341 */
2342static int afiucv_netdev_event(struct notifier_block *this,
2343 unsigned long event, void *ptr)
2344{
351638e7 2345 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
9fbd87d4
UB		 2346 struct sock *sk;
2347 struct iucv_sock *iucv;
2348
2349 switch (event) {
2350 case NETDEV_REBOOT:
2351 case NETDEV_GOING_DOWN:
b67bfe0d 2352 sk_for_each(sk, &iucv_sk_list.head) {
9fbd87d4
UB		 2353 iucv = iucv_sk(sk);
2354 if ((iucv->hs_dev == event_dev) &&
2355 (sk->sk_state == IUCV_CONNECTED)) {
2356 if (event == NETDEV_GOING_DOWN)
2357 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2358 sk->sk_state = IUCV_DISCONN;
2359 sk->sk_state_change(sk);
2360 }
2361 }
2362 break;
2363 case NETDEV_DOWN:
2364 case NETDEV_UNREGISTER:
2365 default:
2366 break;
2367 }
2368 return NOTIFY_DONE;
2369}
2370
2371static struct notifier_block afiucv_netdev_notifier = {
2372 .notifier_call = afiucv_netdev_event,
2373};
2374
5708e868 2375static const struct proto_ops iucv_sock_ops = {
eac3731b
JH		 2376 .family = PF_IUCV,
2377 .owner = THIS_MODULE,
2378 .release = iucv_sock_release,
2379 .bind = iucv_sock_bind,
2380 .connect = iucv_sock_connect,
2381 .listen = iucv_sock_listen,
2382 .accept = iucv_sock_accept,
2383 .getname = iucv_sock_getname,
2384 .sendmsg = iucv_sock_sendmsg,
2385 .recvmsg = iucv_sock_recvmsg,
a11e1d43 2386 .poll = iucv_sock_poll,
eac3731b
JH		 2387 .ioctl = sock_no_ioctl,
2388 .mmap = sock_no_mmap,
2389 .socketpair = sock_no_socketpair,
2390 .shutdown = iucv_sock_shutdown,
9d5c5d8f
HB		 2391 .setsockopt = iucv_sock_setsockopt,
2392 .getsockopt = iucv_sock_getsockopt,
eac3731b
JH		 2393};
2394
ec1b4cf7 2395static const struct net_proto_family iucv_sock_family_ops = {
eac3731b
JH		 2396 .family = AF_IUCV,
2397 .owner = THIS_MODULE,
2398 .create = iucv_sock_create,
2399};
2400
3881ac44
UB		 2401static struct packet_type iucv_packet_type = {
2402 .type = cpu_to_be16(ETH_P_AF_IUCV),
2403 .func = afiucv_hs_rcv,
2404};
2405
2406static int afiucv_iucv_init(void)
6fcd61f7
FB		 2407{
2408 int err;
2409
2410 err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2411 if (err)
2412 goto out;
2413 /* establish dummy device */
2414 af_iucv_driver.bus = pr_iucv->bus;
2415 err = driver_register(&af_iucv_driver);
2416 if (err)
2417 goto out_iucv;
2418 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2419 if (!af_iucv_dev) {
2420 err = -ENOMEM;
2421 goto out_driver;
2422 }
2423 dev_set_name(af_iucv_dev, "af_iucv");
2424 af_iucv_dev->bus = pr_iucv->bus;
2425 af_iucv_dev->parent = pr_iucv->root;
2426 af_iucv_dev->release = (void (*)(struct device *))kfree;
2427 af_iucv_dev->driver = &af_iucv_driver;
2428 err = device_register(af_iucv_dev);
2429 if (err)
fa6a91e9 2430 goto out_iucv_dev;
6fcd61f7
FB		 2431 return 0;
2432
fa6a91e9
AY		 2433out_iucv_dev:
2434 put_device(af_iucv_dev);
6fcd61f7
FB		 2435out_driver:
2436 driver_unregister(&af_iucv_driver);
2437out_iucv:
2438 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2439out:
2440 return err;
2441}
2442
da99f056 2443static int __init afiucv_init(void)
eac3731b
JH		 2444{
2445 int err;
2446
3881ac44
UB		 2447 if (MACHINE_IS_VM) {
2448 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2449 if (unlikely(err)) {
2450 WARN_ON(err);
2451 err = -EPROTONOSUPPORT;
2452 goto out;
2453 }
eac3731b 2454
3881ac44
UB		 2455 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2456 if (!pr_iucv) {
2457 printk(KERN_WARNING "iucv_if lookup failed\n");
2458 memset(&iucv_userid, 0, sizeof(iucv_userid));
2459 }
2460 } else {
2461 memset(&iucv_userid, 0, sizeof(iucv_userid));
2462 pr_iucv = NULL;
6fcd61f7
FB		 2463 }
2464
eac3731b
JH		 2465 err = proto_register(&iucv_proto, 0);
2466 if (err)
6fcd61f7 2467 goto out;
eac3731b
JH		 2468 err = sock_register(&iucv_sock_family_ops);
2469 if (err)
2470 goto out_proto;
6fcd61f7 2471
3881ac44
UB		 2472 if (pr_iucv) {
2473 err = afiucv_iucv_init();
2474 if (err)
2475 goto out_sock;
9fbd87d4
UB		 2476 } else
2477 register_netdevice_notifier(&afiucv_netdev_notifier);
3881ac44 2478 dev_add_pack(&iucv_packet_type);
eac3731b
JH		 2479 return 0;
2480
c23cad92
UB		 2481out_sock:
2482 sock_unregister(PF_IUCV);
eac3731b
JH		 2483out_proto:
2484 proto_unregister(&iucv_proto);
eac3731b 2485out:
6fcd61f7
FB		 2486 if (pr_iucv)
2487 symbol_put(iucv_if);
eac3731b
JH		 2488 return err;
2489}
2490
2491static void __exit afiucv_exit(void)
2492{
3881ac44
UB		 2493 if (pr_iucv) {
2494 device_unregister(af_iucv_dev);
2495 driver_unregister(&af_iucv_driver);
2496 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2497 symbol_put(iucv_if);
9fbd87d4
UB		 2498 } else
2499 unregister_netdevice_notifier(&afiucv_netdev_notifier);
3881ac44 2500 dev_remove_pack(&iucv_packet_type);
eac3731b
JH		 2501 sock_unregister(PF_IUCV);
2502 proto_unregister(&iucv_proto);
eac3731b
JH		 2503}
2504
2505module_init(afiucv_init);
2506module_exit(afiucv_exit);
2507
2508MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2509MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2510MODULE_VERSION(VERSION);
2511MODULE_LICENSE("GPL");
2512MODULE_ALIAS_NETPROTO(PF_IUCV);
Linux 6.x block layer and io_uring tree(s)