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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[mirror_ubuntu-hirsute-kernel.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 18#include <linux/types.h>
0d1c7664 19#include <linux/limits.h>
eac3731b
JH		 20#include <linux/list.h>
21#include <linux/errno.h>
22#include <linux/kernel.h>
174cd4b1 23#include <linux/sched/signal.h>
eac3731b
JH		 24#include <linux/slab.h>
25#include <linux/skbuff.h>
26#include <linux/init.h>
27#include <linux/poll.h>
02f06918 28#include <linux/security.h>
eac3731b
JH		 29#include <net/sock.h>
30#include <asm/ebcdic.h>
31#include <asm/cpcmd.h>
32#include <linux/kmod.h>
33
eac3731b
JH		 34#include <net/iucv/af_iucv.h>
35
3881ac44 36#define VERSION "1.2"
eac3731b
JH		 37
38static char iucv_userid[80];
39
eac3731b
JH		 40static struct proto iucv_proto = {
41 .name = "AF_IUCV",
42 .owner = THIS_MODULE,
43 .obj_size = sizeof(struct iucv_sock),
44};
45
6fcd61f7
FB		 46static struct iucv_interface *pr_iucv;
47
b8942e3b
HB		 48/* special AF_IUCV IPRM messages */
49static const u8 iprm_shutdown[8] =
50 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
51
c593642c 52#define TRGCLS_SIZE sizeof_field(struct iucv_message, class)
44b1e6b5 53
0ea920d2
HB		 54#define __iucv_sock_wait(sk, condition, timeo, ret) \
55do { \
56 DEFINE_WAIT(__wait); \
57 long __timeo = timeo; \
58 ret = 0; \
aa395145 59 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
0ea920d2 60 while (!(condition)) { \
0ea920d2
HB		 61 if (!__timeo) { \
62 ret = -EAGAIN; \
63 break; \
64 } \
65 if (signal_pending(current)) { \
66 ret = sock_intr_errno(__timeo); \
67 break; \
68 } \
69 release_sock(sk); \
70 __timeo = schedule_timeout(__timeo); \
71 lock_sock(sk); \
72 ret = sock_error(sk); \
73 if (ret) \
74 break; \
75 } \
aa395145 76 finish_wait(sk_sleep(sk), &__wait); \
0ea920d2
HB		 77} while (0)
78
79#define iucv_sock_wait(sk, condition, timeo) \
80({ \
81 int __ret = 0; \
82 if (!(condition)) \
83 __iucv_sock_wait(sk, condition, timeo, __ret); \
84 __ret; \
85})
44b1e6b5 86
e9a36ca5
JW		 87static struct sock *iucv_accept_dequeue(struct sock *parent,
88 struct socket *newsock);
57f20448
HC		 89static void iucv_sock_kill(struct sock *sk);
90static void iucv_sock_close(struct sock *sk);
91
3881ac44
UB		 92static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
93
eac3731b
JH		 94/* Call Back functions */
95static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
96static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
91e60eb6
UB		 97static void iucv_callback_connack(struct iucv_path *, u8 *);
98static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
99static void iucv_callback_connrej(struct iucv_path *, u8 *);
100static void iucv_callback_shutdown(struct iucv_path *, u8 *);
eac3731b
JH		 101
102static struct iucv_sock_list iucv_sk_list = {
3db8ce35 103 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
eac3731b
JH		 104 .autobind_name = ATOMIC_INIT(0)
105};
106
107static struct iucv_handler af_iucv_handler = {
108 .path_pending = iucv_callback_connreq,
109 .path_complete = iucv_callback_connack,
110 .path_severed = iucv_callback_connrej,
111 .message_pending = iucv_callback_rx,
af88b52d
HB		 112 .message_complete = iucv_callback_txdone,
113 .path_quiesced = iucv_callback_shutdown,
eac3731b
JH		 114};
115
116static inline void high_nmcpy(unsigned char *dst, char *src)
117{
118 memcpy(dst, src, 8);
119}
120
121static inline void low_nmcpy(unsigned char *dst, char *src)
122{
123 memcpy(&dst[8], src, 8);
124}
125
b8942e3b
HB		 126/**
127 * iucv_msg_length() - Returns the length of an iucv message.
128 * @msg: Pointer to struct iucv_message, MUST NOT be NULL
129 *
130 * The function returns the length of the specified iucv message @msg of data
131 * stored in a buffer and of data stored in the parameter list (PRMDATA).
132 *
133 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
134 * data:
135 * PRMDATA[0..6] socket data (max 7 bytes);
136 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])
137 *
25985edc 138 * The socket data length is computed by subtracting the socket data length
b8942e3b
HB		 139 * value from 0xFF.
140 * If the socket data len is greater 7, then PRMDATA can be used for special
141 * notifications (see iucv_sock_shutdown); and further,
142 * if the socket data len is > 7, the function returns 8.
143 *
144 * Use this function to allocate socket buffers to store iucv message data.
145 */
146static inline size_t iucv_msg_length(struct iucv_message *msg)
147{
148 size_t datalen;
149
150 if (msg->flags & IUCV_IPRMDATA) {
151 datalen = 0xff - msg->rmmsg[7];
152 return (datalen < 8) ? datalen : 8;
153 }
154 return msg->length;
155}
156
0ea920d2
HB		 157/**
158 * iucv_sock_in_state() - check for specific states
159 * @sk: sock structure
160 * @state: first iucv sk state
161 * @state: second iucv sk state
162 *
163 * Returns true if the socket in either in the first or second state.
164 */
165static int iucv_sock_in_state(struct sock *sk, int state, int state2)
166{
167 return (sk->sk_state == state || sk->sk_state == state2);
168}
169
170/**
171 * iucv_below_msglim() - function to check if messages can be sent
172 * @sk: sock structure
173 *
174 * Returns true if the send queue length is lower than the message limit.
175 * Always returns true if the socket is not connected (no iucv path for
176 * checking the message limit).
177 */
178static inline int iucv_below_msglim(struct sock *sk)
179{
180 struct iucv_sock *iucv = iucv_sk(sk);
181
182 if (sk->sk_state != IUCV_CONNECTED)
183 return 1;
3881ac44
UB		 184 if (iucv->transport == AF_IUCV_TRANS_IUCV)
185 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
186 else
187 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
188 (atomic_read(&iucv->pendings) <= 0));
0ea920d2
HB		 189}
190
191/**
192 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
193 */
194static void iucv_sock_wake_msglim(struct sock *sk)
195{
43815482
ED		 196 struct socket_wq *wq;
197
198 rcu_read_lock();
199 wq = rcu_dereference(sk->sk_wq);
1ce0bf50 200 if (skwq_has_sleeper(wq))
43815482 201 wake_up_interruptible_all(&wq->wait);
0ea920d2 202 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
43815482 203 rcu_read_unlock();
0ea920d2
HB		 204}
205
3881ac44
UB		 206/**
207 * afiucv_hs_send() - send a message through HiperSockets transport
208 */
209static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
210 struct sk_buff *skb, u8 flags)
211{
3881ac44
UB		 212 struct iucv_sock *iucv = iucv_sk(sock);
213 struct af_iucv_trans_hdr *phs_hdr;
214 struct sk_buff *nskb;
215 int err, confirm_recv = 0;
216
cd11d112
JW		 217 phs_hdr = skb_push(skb, sizeof(*phs_hdr));
218 memset(phs_hdr, 0, sizeof(*phs_hdr));
3881ac44 219 skb_reset_network_header(skb);
3881ac44
UB		 220
221 phs_hdr->magic = ETH_P_AF_IUCV;
222 phs_hdr->version = 1;
223 phs_hdr->flags = flags;
224 if (flags == AF_IUCV_FLAG_SYN)
225 phs_hdr->window = iucv->msglimit;
226 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
227 confirm_recv = atomic_read(&iucv->msg_recv);
228 phs_hdr->window = confirm_recv;
229 if (confirm_recv)
230 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
231 }
232 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
233 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
234 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
235 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
236 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
237 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
238 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
239 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
240 if (imsg)
241 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
242
800c5eb7 243 skb->dev = iucv->hs_dev;
b2f54394
JW		 244 if (!skb->dev) {
245 err = -ENODEV;
246 goto err_free;
247 }
238965b7
JW		 248
249 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
250
b2f54394
JW		 251 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
252 err = -ENETDOWN;
253 goto err_free;
254 }
3881ac44 255 if (skb->len > skb->dev->mtu) {
b2f54394
JW		 256 if (sock->sk_type == SOCK_SEQPACKET) {
257 err = -EMSGSIZE;
258 goto err_free;
259 }
260 skb_trim(skb, skb->dev->mtu);
3881ac44 261 }
2e56c26b 262 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
238965b7
JW		 263
264 __skb_header_release(skb);
3881ac44 265 nskb = skb_clone(skb, GFP_ATOMIC);
b2f54394
JW		 266 if (!nskb) {
267 err = -ENOMEM;
268 goto err_free;
269 }
270
3881ac44
UB		 271 skb_queue_tail(&iucv->send_skb_q, nskb);
272 err = dev_queue_xmit(skb);
800c5eb7 273 if (net_xmit_eval(err)) {
3881ac44
UB		 274 skb_unlink(nskb, &iucv->send_skb_q);
275 kfree_skb(nskb);
276 } else {
277 atomic_sub(confirm_recv, &iucv->msg_recv);
278 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
279 }
800c5eb7 280 return net_xmit_eval(err);
b2f54394
JW		 281
282err_free:
283 kfree_skb(skb);
284 return err;
3881ac44
UB		 285}
286
eac3731b
JH		 287static struct sock *__iucv_get_sock_by_name(char *nm)
288{
289 struct sock *sk;
eac3731b 290
b67bfe0d 291 sk_for_each(sk, &iucv_sk_list.head)
eac3731b
JH		 292 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
293 return sk;
294
295 return NULL;
296}
297
298static void iucv_sock_destruct(struct sock *sk)
299{
300 skb_queue_purge(&sk->sk_receive_queue);
82492a35
UB		 301 skb_queue_purge(&sk->sk_error_queue);
302
303 sk_mem_reclaim(sk);
304
305 if (!sock_flag(sk, SOCK_DEAD)) {
306 pr_err("Attempt to release alive iucv socket %p\n", sk);
307 return;
308 }
309
310 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
b2c9c5df 311 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
82492a35
UB		 312 WARN_ON(sk->sk_wmem_queued);
313 WARN_ON(sk->sk_forward_alloc);
eac3731b
JH		 314}
315
316/* Cleanup Listen */
317static void iucv_sock_cleanup_listen(struct sock *parent)
318{
319 struct sock *sk;
320
321 /* Close non-accepted connections */
322 while ((sk = iucv_accept_dequeue(parent, NULL))) {
323 iucv_sock_close(sk);
324 iucv_sock_kill(sk);
325 }
326
327 parent->sk_state = IUCV_CLOSED;
eac3731b
JH		 328}
329
e9a36ca5
JW		 330static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
331{
332 write_lock_bh(&l->lock);
333 sk_add_node(sk, &l->head);
334 write_unlock_bh(&l->lock);
335}
336
337static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
338{
339 write_lock_bh(&l->lock);
340 sk_del_node_init(sk);
341 write_unlock_bh(&l->lock);
342}
343
7514bab0 344/* Kill socket (only if zapped and orphaned) */
eac3731b
JH		 345static void iucv_sock_kill(struct sock *sk)
346{
347 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
348 return;
349
350 iucv_sock_unlink(&iucv_sk_list, sk);
351 sock_set_flag(sk, SOCK_DEAD);
352 sock_put(sk);
353}
354
7d316b94
UB		 355/* Terminate an IUCV path */
356static void iucv_sever_path(struct sock *sk, int with_user_data)
357{
358 unsigned char user_data[16];
359 struct iucv_sock *iucv = iucv_sk(sk);
360 struct iucv_path *path = iucv->path;
361
362 if (iucv->path) {
363 iucv->path = NULL;
364 if (with_user_data) {
365 low_nmcpy(user_data, iucv->src_name);
366 high_nmcpy(user_data, iucv->dst_name);
367 ASCEBC(user_data, sizeof(user_data));
368 pr_iucv->path_sever(path, user_data);
369 } else
370 pr_iucv->path_sever(path, NULL);
371 iucv_path_free(path);
372 }
373}
374
4e0ad322 375/* Send controlling flags through an IUCV socket for HIPER transport */
9fbd87d4
UB		 376static int iucv_send_ctrl(struct sock *sk, u8 flags)
377{
238965b7 378 struct iucv_sock *iucv = iucv_sk(sk);
9fbd87d4
UB		 379 int err = 0;
380 int blen;
381 struct sk_buff *skb;
4e0ad322 382 u8 shutdown = 0;
9fbd87d4 383
238965b7
JW		 384 blen = sizeof(struct af_iucv_trans_hdr) +
385 LL_RESERVED_SPACE(iucv->hs_dev);
4e0ad322
UB		 386 if (sk->sk_shutdown & SEND_SHUTDOWN) {
387 /* controlling flags should be sent anyway */
388 shutdown = sk->sk_shutdown;
389 sk->sk_shutdown &= RCV_SHUTDOWN;
390 }
9fbd87d4
UB		 391 skb = sock_alloc_send_skb(sk, blen, 1, &err);
392 if (skb) {
393 skb_reserve(skb, blen);
394 err = afiucv_hs_send(NULL, sk, skb, flags);
395 }
4e0ad322
UB		 396 if (shutdown)
397 sk->sk_shutdown = shutdown;
9fbd87d4
UB		 398 return err;
399}
400
eac3731b
JH		 401/* Close an IUCV socket */
402static void iucv_sock_close(struct sock *sk)
403{
eac3731b 404 struct iucv_sock *iucv = iucv_sk(sk);
561e0360 405 unsigned long timeo;
800c5eb7 406 int err = 0;
eac3731b 407
eac3731b
JH		 408 lock_sock(sk);
409
da99f056 410 switch (sk->sk_state) {
eac3731b
JH		 411 case IUCV_LISTEN:
412 iucv_sock_cleanup_listen(sk);
413 break;
414
415 case IUCV_CONNECTED:
3881ac44 416 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
9fbd87d4 417 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
3881ac44
UB		 418 sk->sk_state = IUCV_DISCONN;
419 sk->sk_state_change(sk);
420 }
df561f66 421 fallthrough;
05bba1ed
GS		 422
423 case IUCV_DISCONN:
561e0360
JH		 424 sk->sk_state = IUCV_CLOSING;
425 sk->sk_state_change(sk);
426
800c5eb7 427 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
561e0360
JH		 428 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
429 timeo = sk->sk_lingertime;
430 else
431 timeo = IUCV_DISCONN_TIMEOUT;
9f6298a6 432 iucv_sock_wait(sk,
0ea920d2
HB		 433 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
434 timeo);
561e0360 435 }
df561f66 436 fallthrough;
561e0360 437
05bba1ed 438 case IUCV_CLOSING:
561e0360
JH		 439 sk->sk_state = IUCV_CLOSED;
440 sk->sk_state_change(sk);
441
eac3731b
JH		 442 sk->sk_err = ECONNRESET;
443 sk->sk_state_change(sk);
444
800c5eb7 445 skb_queue_purge(&iucv->send_skb_q);
561e0360 446 skb_queue_purge(&iucv->backlog_skb_q);
df561f66 447 fallthrough;
eac3731b 448
05bba1ed 449 default:
7d316b94 450 iucv_sever_path(sk, 1);
3ff50b79 451 }
eac3731b 452
800c5eb7
UB		 453 if (iucv->hs_dev) {
454 dev_put(iucv->hs_dev);
455 iucv->hs_dev = NULL;
456 sk->sk_bound_dev_if = 0;
457 }
458
7514bab0
HB		 459 /* mark socket for deletion by iucv_sock_kill() */
460 sock_set_flag(sk, SOCK_ZAPPED);
461
eac3731b 462 release_sock(sk);
eac3731b
JH		 463}
464
465static void iucv_sock_init(struct sock *sk, struct sock *parent)
466{
02f06918 467 if (parent) {
eac3731b 468 sk->sk_type = parent->sk_type;
02f06918
PM		 469 security_sk_clone(parent, sk);
470 }
eac3731b
JH		 471}
472
11aa9c28 473static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
eac3731b
JH		 474{
475 struct sock *sk;
493d3971 476 struct iucv_sock *iucv;
eac3731b 477
11aa9c28 478 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
eac3731b
JH		 479 if (!sk)
480 return NULL;
493d3971 481 iucv = iucv_sk(sk);
eac3731b
JH		 482
483 sock_init_data(sock, sk);
493d3971
UB		 484 INIT_LIST_HEAD(&iucv->accept_q);
485 spin_lock_init(&iucv->accept_q_lock);
486 skb_queue_head_init(&iucv->send_skb_q);
487 INIT_LIST_HEAD(&iucv->message_q.list);
488 spin_lock_init(&iucv->message_q.lock);
489 skb_queue_head_init(&iucv->backlog_skb_q);
490 iucv->send_tag = 0;
3881ac44 491 atomic_set(&iucv->pendings, 0);
493d3971 492 iucv->flags = 0;
3881ac44
UB		 493 iucv->msglimit = 0;
494 atomic_set(&iucv->msg_sent, 0);
495 atomic_set(&iucv->msg_recv, 0);
493d3971 496 iucv->path = NULL;
3881ac44 497 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
493d3971 498 memset(&iucv->src_user_id , 0, 32);
3881ac44
UB		 499 if (pr_iucv)
500 iucv->transport = AF_IUCV_TRANS_IUCV;
501 else
502 iucv->transport = AF_IUCV_TRANS_HIPER;
eac3731b
JH		 503
504 sk->sk_destruct = iucv_sock_destruct;
505 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
eac3731b
JH		 506
507 sock_reset_flag(sk, SOCK_ZAPPED);
508
509 sk->sk_protocol = proto;
510 sk->sk_state = IUCV_OPEN;
511
eac3731b
JH		 512 iucv_sock_link(&iucv_sk_list, sk);
513 return sk;
514}
515
e9a36ca5 516static void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
eac3731b 517{
febca281
UB		 518 unsigned long flags;
519 struct iucv_sock *par = iucv_sk(parent);
520
eac3731b 521 sock_hold(sk);
febca281
UB		 522 spin_lock_irqsave(&par->accept_q_lock, flags);
523 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
524 spin_unlock_irqrestore(&par->accept_q_lock, flags);
eac3731b 525 iucv_sk(sk)->parent = parent;
49f5eba7 526 sk_acceptq_added(parent);
eac3731b
JH		 527}
528
e9a36ca5 529static void iucv_accept_unlink(struct sock *sk)
eac3731b 530{
febca281
UB		 531 unsigned long flags;
532 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
533
534 spin_lock_irqsave(&par->accept_q_lock, flags);
eac3731b 535 list_del_init(&iucv_sk(sk)->accept_q);
febca281 536 spin_unlock_irqrestore(&par->accept_q_lock, flags);
49f5eba7 537 sk_acceptq_removed(iucv_sk(sk)->parent);
eac3731b
JH		 538 iucv_sk(sk)->parent = NULL;
539 sock_put(sk);
540}
541
e9a36ca5
JW		 542static struct sock *iucv_accept_dequeue(struct sock *parent,
543 struct socket *newsock)
eac3731b
JH		 544{
545 struct iucv_sock *isk, *n;
546 struct sock *sk;
547
da99f056 548 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
eac3731b
JH		 549 sk = (struct sock *) isk;
550 lock_sock(sk);
551
552 if (sk->sk_state == IUCV_CLOSED) {
eac3731b 553 iucv_accept_unlink(sk);
febca281 554 release_sock(sk);
eac3731b
JH		 555 continue;
556 }
557
558 if (sk->sk_state == IUCV_CONNECTED ||
aac6399c 559 sk->sk_state == IUCV_DISCONN ||
eac3731b
JH		 560 !newsock) {
561 iucv_accept_unlink(sk);
562 if (newsock)
563 sock_graft(sk, newsock);
564
eac3731b
JH		 565 release_sock(sk);
566 return sk;
567 }
568
569 release_sock(sk);
570 }
571 return NULL;
572}
573
53a4b499
PH		 574static void __iucv_auto_name(struct iucv_sock *iucv)
575{
576 char name[12];
577
578 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
579 while (__iucv_get_sock_by_name(name)) {
580 sprintf(name, "%08x",
581 atomic_inc_return(&iucv_sk_list.autobind_name));
582 }
583 memcpy(iucv->src_name, name, 8);
584}
585
eac3731b
JH		 586/* Bind an unbound socket */
587static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
588 int addr_len)
589{
97f8841e 590 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
398999ba 591 char uid[sizeof(sa->siucv_user_id)];
eac3731b
JH		 592 struct sock *sk = sock->sk;
593 struct iucv_sock *iucv;
3881ac44
UB		 594 int err = 0;
595 struct net_device *dev;
eac3731b
JH		 596
597 /* Verify the input sockaddr */
e3c42b61
MJ		 598 if (addr_len < sizeof(struct sockaddr_iucv) ||
599 addr->sa_family != AF_IUCV)
52a82e23
UB		 600 return -EINVAL;
601
eac3731b
JH		 602 lock_sock(sk);
603 if (sk->sk_state != IUCV_OPEN) {
604 err = -EBADFD;
605 goto done;
606 }
607
608 write_lock_bh(&iucv_sk_list.lock);
609
610 iucv = iucv_sk(sk);
611 if (__iucv_get_sock_by_name(sa->siucv_name)) {
612 err = -EADDRINUSE;
613 goto done_unlock;
614 }
3881ac44 615 if (iucv->path)
eac3731b 616 goto done_unlock;
eac3731b
JH		 617
618 /* Bind the socket */
3881ac44
UB		 619 if (pr_iucv)
620 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
621 goto vm_bind; /* VM IUCV transport */
eac3731b 622
3881ac44
UB		 623 /* try hiper transport */
624 memcpy(uid, sa->siucv_user_id, sizeof(uid));
625 ASCEBC(uid, 8);
626 rcu_read_lock();
627 for_each_netdev_rcu(&init_net, dev) {
628 if (!memcmp(dev->perm_addr, uid, 8)) {
3881ac44 629 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
53a4b499
PH		 630 /* Check for unitialized siucv_name */
631 if (strncmp(sa->siucv_name, " ", 8) == 0)
632 __iucv_auto_name(iucv);
633 else
634 memcpy(iucv->src_name, sa->siucv_name, 8);
816abbad 635 sk->sk_bound_dev_if = dev->ifindex;
800c5eb7
UB		 636 iucv->hs_dev = dev;
637 dev_hold(dev);
3881ac44
UB		 638 sk->sk_state = IUCV_BOUND;
639 iucv->transport = AF_IUCV_TRANS_HIPER;
640 if (!iucv->msglimit)
641 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
642 rcu_read_unlock();
643 goto done_unlock;
644 }
645 }
646 rcu_read_unlock();
647vm_bind:
648 if (pr_iucv) {
649 /* use local userid for backward compat */
650 memcpy(iucv->src_name, sa->siucv_name, 8);
651 memcpy(iucv->src_user_id, iucv_userid, 8);
652 sk->sk_state = IUCV_BOUND;
653 iucv->transport = AF_IUCV_TRANS_IUCV;
fdbf6326 654 sk->sk_allocation |= GFP_DMA;
3881ac44
UB		 655 if (!iucv->msglimit)
656 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
657 goto done_unlock;
658 }
659 /* found no dev to bind */
660 err = -ENODEV;
eac3731b
JH		 661done_unlock:
662 /* Release the socket list lock */
663 write_unlock_bh(&iucv_sk_list.lock);
664done:
665 release_sock(sk);
666 return err;
667}
668
669/* Automatically bind an unbound socket */
670static int iucv_sock_autobind(struct sock *sk)
671{
672 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 673 int err = 0;
674
aac6399c 675 if (unlikely(!pr_iucv))
eac3731b
JH		 676 return -EPROTO;
677
aac6399c 678 memcpy(iucv->src_user_id, iucv_userid, 8);
fdbf6326
JW		 679 iucv->transport = AF_IUCV_TRANS_IUCV;
680 sk->sk_allocation |= GFP_DMA;
eac3731b
JH		 681
682 write_lock_bh(&iucv_sk_list.lock);
53a4b499 683 __iucv_auto_name(iucv);
eac3731b
JH		 684 write_unlock_bh(&iucv_sk_list.lock);
685
3881ac44
UB		 686 if (!iucv->msglimit)
687 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
688
eac3731b
JH		 689 return err;
690}
691
3881ac44 692static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
eac3731b 693{
97f8841e 694 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
eac3731b 695 struct sock *sk = sock->sk;
493d3971 696 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 697 unsigned char user_data[16];
698 int err;
699
eac3731b 700 high_nmcpy(user_data, sa->siucv_name);
493d3971 701 low_nmcpy(user_data, iucv->src_name);
eac3731b
JH		 702 ASCEBC(user_data, sizeof(user_data));
703
eac3731b 704 /* Create path. */
09488e2e 705 iucv->path = iucv_path_alloc(iucv->msglimit,
b8942e3b 706 IUCV_IPRMDATA, GFP_KERNEL);
d4444722
UB		 707 if (!iucv->path) {
708 err = -ENOMEM;
709 goto done;
710 }
6fcd61f7
FB		 711 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
712 sa->siucv_user_id, NULL, user_data,
713 sk);
eac3731b
JH		 714 if (err) {
715 iucv_path_free(iucv->path);
716 iucv->path = NULL;
55cdea9e
HB		 717 switch (err) {
718 case 0x0b: /* Target communicator is not logged on */
719 err = -ENETUNREACH;
720 break;
721 case 0x0d: /* Max connections for this guest exceeded */
722 case 0x0e: /* Max connections for target guest exceeded */
723 err = -EAGAIN;
724 break;
725 case 0x0f: /* Missing IUCV authorization */
726 err = -EACCES;
727 break;
728 default:
729 err = -ECONNREFUSED;
730 break;
731 }
eac3731b 732 }
3881ac44
UB		 733done:
734 return err;
735}
eac3731b 736
3881ac44
UB		 737/* Connect an unconnected socket */
738static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
739 int alen, int flags)
740{
97f8841e 741 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
3881ac44
UB		 742 struct sock *sk = sock->sk;
743 struct iucv_sock *iucv = iucv_sk(sk);
744 int err;
745
e3c42b61 746 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
3881ac44
UB		 747 return -EINVAL;
748
749 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
750 return -EBADFD;
751
752 if (sk->sk_state == IUCV_OPEN &&
753 iucv->transport == AF_IUCV_TRANS_HIPER)
754 return -EBADFD; /* explicit bind required */
755
756 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
757 return -EINVAL;
758
759 if (sk->sk_state == IUCV_OPEN) {
760 err = iucv_sock_autobind(sk);
761 if (unlikely(err))
762 return err;
763 }
764
765 lock_sock(sk);
766
767 /* Set the destination information */
768 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
769 memcpy(iucv->dst_name, sa->siucv_name, 8);
770
771 if (iucv->transport == AF_IUCV_TRANS_HIPER)
9fbd87d4 772 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
3881ac44
UB		 773 else
774 err = afiucv_path_connect(sock, addr);
775 if (err)
776 goto done;
777
778 if (sk->sk_state != IUCV_CONNECTED)
0ea920d2
HB		 779 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
780 IUCV_DISCONN),
781 sock_sndtimeo(sk, flags & O_NONBLOCK));
eac3731b 782
3881ac44 783 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
b8942e3b 784 err = -ECONNREFUSED;
18becbc5 785
7d316b94
UB		 786 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
787 iucv_sever_path(sk, 0);
18becbc5 788
eac3731b
JH		 789done:
790 release_sock(sk);
791 return err;
792}
793
794/* Move a socket into listening state. */
795static int iucv_sock_listen(struct socket *sock, int backlog)
796{
797 struct sock *sk = sock->sk;
798 int err;
799
800 lock_sock(sk);
801
802 err = -EINVAL;
aa8e71f5
HB		 803 if (sk->sk_state != IUCV_BOUND)
804 goto done;
805
806 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
eac3731b
JH		 807 goto done;
808
809 sk->sk_max_ack_backlog = backlog;
810 sk->sk_ack_backlog = 0;
811 sk->sk_state = IUCV_LISTEN;
812 err = 0;
813
814done:
815 release_sock(sk);
816 return err;
817}
818
819/* Accept a pending connection */
820static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
cdfbabfb 821 int flags, bool kern)
eac3731b
JH		 822{
823 DECLARE_WAITQUEUE(wait, current);
824 struct sock *sk = sock->sk, *nsk;
825 long timeo;
826 int err = 0;
827
561e0360 828 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
eac3731b
JH		 829
830 if (sk->sk_state != IUCV_LISTEN) {
831 err = -EBADFD;
832 goto done;
833 }
834
835 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
836
837 /* Wait for an incoming connection */
aa395145 838 add_wait_queue_exclusive(sk_sleep(sk), &wait);
da99f056 839 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
eac3731b
JH		 840 set_current_state(TASK_INTERRUPTIBLE);
841 if (!timeo) {
842 err = -EAGAIN;
843 break;
844 }
845
846 release_sock(sk);
847 timeo = schedule_timeout(timeo);
561e0360 848 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
eac3731b
JH		 849
850 if (sk->sk_state != IUCV_LISTEN) {
851 err = -EBADFD;
852 break;
853 }
854
855 if (signal_pending(current)) {
856 err = sock_intr_errno(timeo);
857 break;
858 }
859 }
860
861 set_current_state(TASK_RUNNING);
aa395145 862 remove_wait_queue(sk_sleep(sk), &wait);
eac3731b
JH		 863
864 if (err)
865 goto done;
866
867 newsock->state = SS_CONNECTED;
868
869done:
870 release_sock(sk);
871 return err;
872}
873
874static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
9b2c45d4 875 int peer)
eac3731b 876{
97f8841e 877 DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr);
eac3731b 878 struct sock *sk = sock->sk;
493d3971 879 struct iucv_sock *iucv = iucv_sk(sk);
eac3731b
JH		 880
881 addr->sa_family = AF_IUCV;
eac3731b
JH		 882
883 if (peer) {
493d3971
UB		 884 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
885 memcpy(siucv->siucv_name, iucv->dst_name, 8);
eac3731b 886 } else {
493d3971
UB		 887 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
888 memcpy(siucv->siucv_name, iucv->src_name, 8);
eac3731b
JH		 889 }
890 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
891 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
493d3971 892 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
eac3731b 893
9b2c45d4 894 return sizeof(struct sockaddr_iucv);
eac3731b
JH		 895}
896
b8942e3b
HB		 897/**
898 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
899 * @path: IUCV path
900 * @msg: Pointer to a struct iucv_message
901 * @skb: The socket data to send, skb->len MUST BE <= 7
902 *
903 * Send the socket data in the parameter list in the iucv message
904 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
905 * list and the socket data len at index 7 (last byte).
906 * See also iucv_msg_length().
907 *
908 * Returns the error code from the iucv_message_send() call.
909 */
910static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
911 struct sk_buff *skb)
912{
913 u8 prmdata[8];
914
915 memcpy(prmdata, (void *) skb->data, skb->len);
916 prmdata[7] = 0xff - (u8) skb->len;
6fcd61f7 917 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
b8942e3b
HB		 918 (void *) prmdata, 8);
919}
920
1b784140
YX		 921static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
922 size_t len)
eac3731b
JH		 923{
924 struct sock *sk = sock->sk;
925 struct iucv_sock *iucv = iucv_sk(sk);
dc5367bc
JW		 926 size_t headroom = 0;
927 size_t linear;
eac3731b 928 struct sk_buff *skb;
0506eb01 929 struct iucv_message txmsg = {0};
44b1e6b5
HB		 930 struct cmsghdr *cmsg;
931 int cmsg_done;
0ea920d2 932 long timeo;
8f7c502c
UB		 933 char user_id[9];
934 char appl_id[9];
eac3731b 935 int err;
0ea920d2 936 int noblock = msg->msg_flags & MSG_DONTWAIT;
eac3731b
JH		 937
938 err = sock_error(sk);
939 if (err)
940 return err;
941
942 if (msg->msg_flags & MSG_OOB)
943 return -EOPNOTSUPP;
944
aa8e71f5
HB		 945 /* SOCK_SEQPACKET: we do not support segmented records */
946 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
947 return -EOPNOTSUPP;
948
eac3731b
JH		 949 lock_sock(sk);
950
951 if (sk->sk_shutdown & SEND_SHUTDOWN) {
952 err = -EPIPE;
953 goto out;
954 }
955
bb664f49
HB		 956 /* Return if the socket is not in connected state */
957 if (sk->sk_state != IUCV_CONNECTED) {
958 err = -ENOTCONN;
959 goto out;
960 }
44b1e6b5 961
bb664f49
HB		 962 /* initialize defaults */
963 cmsg_done = 0; /* check for duplicate headers */
44b1e6b5 964
bb664f49 965 /* iterate over control messages */
f95b414e 966 for_each_cmsghdr(cmsg, msg) {
bb664f49
HB		 967 if (!CMSG_OK(msg, cmsg)) {
968 err = -EINVAL;
969 goto out;
970 }
44b1e6b5 971
bb664f49
HB		 972 if (cmsg->cmsg_level != SOL_IUCV)
973 continue;
44b1e6b5 974
bb664f49
HB		 975 if (cmsg->cmsg_type & cmsg_done) {
976 err = -EINVAL;
977 goto out;
978 }
979 cmsg_done |= cmsg->cmsg_type;
44b1e6b5 980
bb664f49
HB		 981 switch (cmsg->cmsg_type) {
982 case SCM_IUCV_TRGCLS:
983 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
44b1e6b5
HB		 984 err = -EINVAL;
985 goto out;
986 }
44b1e6b5 987
bb664f49
HB		 988 /* set iucv message target class */
989 memcpy(&txmsg.class,
990 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
44b1e6b5 991
bb664f49 992 break;
44b1e6b5 993
bb664f49
HB		 994 default:
995 err = -EINVAL;
996 goto out;
44b1e6b5 997 }
bb664f49 998 }
44b1e6b5 999
bb664f49
HB		 1000 /* allocate one skb for each iucv message:
1001 * this is fine for SOCK_SEQPACKET (unless we want to support
1002 * segmented records using the MSG_EOR flag), but
1003 * for SOCK_STREAM we might want to improve it in future */
dc5367bc 1004 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
238965b7
JW		 1005 headroom = sizeof(struct af_iucv_trans_hdr) +
1006 LL_RESERVED_SPACE(iucv->hs_dev);
e5374399
EC		 1007 linear = len;
1008 } else {
dc5367bc
JW		 1009 if (len < PAGE_SIZE) {
1010 linear = len;
1011 } else {
1012 /* In nonlinear "classic" iucv skb,
1013 * reserve space for iucv_array
1014 */
1015 headroom = sizeof(struct iucv_array) *
1016 (MAX_SKB_FRAGS + 1);
1017 linear = PAGE_SIZE - headroom;
1018 }
e5374399
EC		 1019 }
1020 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1021 noblock, &err, 0);
ed4ac422 1022 if (!skb)
bb664f49 1023 goto out;
e5374399
EC		 1024 if (headroom)
1025 skb_reserve(skb, headroom);
1026 skb_put(skb, linear);
1027 skb->len = len;
1028 skb->data_len = len - linear;
1029 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1030 if (err)
bb664f49 1031 goto fail;
eac3731b 1032
0ea920d2
HB		 1033 /* wait if outstanding messages for iucv path has reached */
1034 timeo = sock_sndtimeo(sk, noblock);
1035 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1036 if (err)
1037 goto fail;
eac3731b 1038
0ea920d2
HB		 1039 /* return -ECONNRESET if the socket is no longer connected */
1040 if (sk->sk_state != IUCV_CONNECTED) {
1041 err = -ECONNRESET;
1042 goto fail;
1043 }
b8942e3b 1044
bb664f49
HB		 1045 /* increment and save iucv message tag for msg_completion cbk */
1046 txmsg.tag = iucv->send_tag++;
f9c41a62 1047 IUCV_SKB_CB(skb)->tag = txmsg.tag;
800c5eb7 1048
3881ac44
UB		 1049 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1050 atomic_inc(&iucv->msg_sent);
1051 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1052 if (err) {
1053 atomic_dec(&iucv->msg_sent);
b2f54394 1054 goto out;
3881ac44 1055 }
e5374399
EC		 1056 } else { /* Classic VM IUCV transport */
1057 skb_queue_tail(&iucv->send_skb_q, skb);
1058
1059 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1060 skb->len <= 7) {
1061 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1062
1063 /* on success: there is no message_complete callback */
1064 /* for an IPRMDATA msg; remove skb from send queue */
1065 if (err == 0) {
1066 skb_unlink(skb, &iucv->send_skb_q);
1067 kfree_skb(skb);
1068 }
b8942e3b 1069
e5374399
EC		 1070 /* this error should never happen since the */
1071 /* IUCV_IPRMDATA path flag is set... sever path */
1072 if (err == 0x15) {
1073 pr_iucv->path_sever(iucv->path, NULL);
1074 skb_unlink(skb, &iucv->send_skb_q);
1075 err = -EPIPE;
1076 goto fail;
1077 }
1078 } else if (skb_is_nonlinear(skb)) {
1079 struct iucv_array *iba = (struct iucv_array *)skb->head;
1080 int i;
1081
1082 /* skip iucv_array lying in the headroom */
1083 iba[0].address = (u32)(addr_t)skb->data;
1084 iba[0].length = (u32)skb_headlen(skb);
1085 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1086 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1087
1088 iba[i + 1].address =
1089 (u32)(addr_t)skb_frag_address(frag);
1090 iba[i + 1].length = (u32)skb_frag_size(frag);
1091 }
1092 err = pr_iucv->message_send(iucv->path, &txmsg,
1093 IUCV_IPBUFLST, 0,
1094 (void *)iba, skb->len);
1095 } else { /* non-IPRM Linear skb */
1096 err = pr_iucv->message_send(iucv->path, &txmsg,
1097 0, 0, (void *)skb->data, skb->len);
bb664f49 1098 }
e5374399
EC		 1099 if (err) {
1100 if (err == 3) {
1101 user_id[8] = 0;
1102 memcpy(user_id, iucv->dst_user_id, 8);
1103 appl_id[8] = 0;
1104 memcpy(appl_id, iucv->dst_name, 8);
1105 pr_err(
1106 "Application %s on z/VM guest %s exceeds message limit\n",
1107 appl_id, user_id);
1108 err = -EAGAIN;
1109 } else {
1110 err = -EPIPE;
1111 }
eac3731b 1112 skb_unlink(skb, &iucv->send_skb_q);
eac3731b
JH		 1113 goto fail;
1114 }
eac3731b
JH		 1115 }
1116
1117 release_sock(sk);
1118 return len;
1119
1120fail:
1121 kfree_skb(skb);
1122out:
1123 release_sock(sk);
1124 return err;
1125}
1126
a006353a
EC		 1127static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1128{
1129 size_t headroom, linear;
1130 struct sk_buff *skb;
1131 int err;
1132
1133 if (len < PAGE_SIZE) {
1134 headroom = 0;
1135 linear = len;
1136 } else {
1137 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1138 linear = PAGE_SIZE - headroom;
1139 }
1140 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1141 0, &err, GFP_ATOMIC | GFP_DMA);
1142 WARN_ONCE(!skb,
1143 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1144 len, err);
1145 if (skb) {
1146 if (headroom)
1147 skb_reserve(skb, headroom);
1148 skb_put(skb, linear);
1149 skb->len = len;
1150 skb->data_len = len - linear;
1151 }
1152 return skb;
1153}
1154
bf95d20f
HB		 1155/* iucv_process_message() - Receive a single outstanding IUCV message
1156 *
1157 * Locking: must be called with message_q.lock held
1158 */
f0703c80
UB		 1159static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1160 struct iucv_path *path,
1161 struct iucv_message *msg)
1162{
1163 int rc;
b8942e3b
HB		 1164 unsigned int len;
1165
1166 len = iucv_msg_length(msg);
f0703c80 1167
44b1e6b5
HB		 1168 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1169 /* Note: the first 4 bytes are reserved for msg tag */
f9c41a62 1170 IUCV_SKB_CB(skb)->class = msg->class;
44b1e6b5 1171
b8942e3b
HB		 1172 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1173 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1174 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1175 skb->data = NULL;
1176 skb->len = 0;
1177 }
f0703c80 1178 } else {
a006353a
EC		 1179 if (skb_is_nonlinear(skb)) {
1180 struct iucv_array *iba = (struct iucv_array *)skb->head;
1181 int i;
1182
1183 iba[0].address = (u32)(addr_t)skb->data;
1184 iba[0].length = (u32)skb_headlen(skb);
1185 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1186 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1187
1188 iba[i + 1].address =
1189 (u32)(addr_t)skb_frag_address(frag);
1190 iba[i + 1].length = (u32)skb_frag_size(frag);
1191 }
1192 rc = pr_iucv->message_receive(path, msg,
1193 IUCV_IPBUFLST,
1194 (void *)iba, len, NULL);
1195 } else {
1196 rc = pr_iucv->message_receive(path, msg,
6fcd61f7
FB		 1197 msg->flags & IUCV_IPRMDATA,
1198 skb->data, len, NULL);
a006353a 1199 }
f0703c80
UB		 1200 if (rc) {
1201 kfree_skb(skb);
1202 return;
1203 }
a006353a 1204 WARN_ON_ONCE(skb->len != len);
f0703c80
UB		 1205 }
1206
f9c41a62 1207 IUCV_SKB_CB(skb)->offset = 0;
8c68b1a0
UB		 1208 if (sk_filter(sk, skb)) {
1209 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1210 kfree_skb(skb);
1211 return;
1212 }
1213 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1214 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
f0703c80
UB		 1215}
1216
bf95d20f
HB		 1217/* iucv_process_message_q() - Process outstanding IUCV messages
1218 *
1219 * Locking: must be called with message_q.lock held
1220 */
f0703c80
UB		 1221static void iucv_process_message_q(struct sock *sk)
1222{
1223 struct iucv_sock *iucv = iucv_sk(sk);
1224 struct sk_buff *skb;
1225 struct sock_msg_q *p, *n;
1226
1227 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
a006353a 1228 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
f0703c80
UB		 1229 if (!skb)
1230 break;
1231 iucv_process_message(sk, skb, p->path, &p->msg);
1232 list_del(&p->list);
1233 kfree(p);
1234 if (!skb_queue_empty(&iucv->backlog_skb_q))
1235 break;
1236 }
1237}
1238
1b784140
YX		 1239static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1240 size_t len, int flags)
eac3731b
JH		 1241{
1242 int noblock = flags & MSG_DONTWAIT;
1243 struct sock *sk = sock->sk;
561e0360 1244 struct iucv_sock *iucv = iucv_sk(sk);
aa8e71f5 1245 unsigned int copied, rlen;
9fbd87d4 1246 struct sk_buff *skb, *rskb, *cskb;
eac3731b 1247 int err = 0;
f9c41a62 1248 u32 offset;
eac3731b 1249
aac6399c 1250 if ((sk->sk_state == IUCV_DISCONN) &&
f0703c80
UB		 1251 skb_queue_empty(&iucv->backlog_skb_q) &&
1252 skb_queue_empty(&sk->sk_receive_queue) &&
1253 list_empty(&iucv->message_q.list))
561e0360
JH		 1254 return 0;
1255
eac3731b
JH		 1256 if (flags & (MSG_OOB))
1257 return -EOPNOTSUPP;
1258
60d3705f
HB		 1259 /* receive/dequeue next skb:
1260 * the function understands MSG_PEEK and, thus, does not dequeue skb */
eac3731b
JH		 1261 skb = skb_recv_datagram(sk, flags, noblock, &err);
1262 if (!skb) {
1263 if (sk->sk_shutdown & RCV_SHUTDOWN)
1264 return 0;
1265 return err;
1266 }
1267
f9c41a62
UB		 1268 offset = IUCV_SKB_CB(skb)->offset;
1269 rlen = skb->len - offset; /* real length of skb */
aa8e71f5 1270 copied = min_t(unsigned int, rlen, len);
82492a35
UB		 1271 if (!rlen)
1272 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
eac3731b 1273
561e0360 1274 cskb = skb;
51f3d02b 1275 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
802788bf
HB		 1276 if (!(flags & MSG_PEEK))
1277 skb_queue_head(&sk->sk_receive_queue, skb);
1278 return -EFAULT;
eac3731b
JH		 1279 }
1280
aa8e71f5
HB		 1281 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1282 if (sk->sk_type == SOCK_SEQPACKET) {
1283 if (copied < rlen)
1284 msg->msg_flags |= MSG_TRUNC;
1285 /* each iucv message contains a complete record */
1286 msg->msg_flags |= MSG_EOR;
1287 }
eac3731b 1288
44b1e6b5
HB		 1289 /* create control message to store iucv msg target class:
1290 * get the trgcls from the control buffer of the skb due to
1291 * fragmentation of original iucv message. */
1292 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
f9c41a62
UB		 1293 sizeof(IUCV_SKB_CB(skb)->class),
1294 (void *)&IUCV_SKB_CB(skb)->class);
44b1e6b5
HB		 1295 if (err) {
1296 if (!(flags & MSG_PEEK))
1297 skb_queue_head(&sk->sk_receive_queue, skb);
1298 return err;
1299 }
1300
eac3731b
JH		 1301 /* Mark read part of skb as used */
1302 if (!(flags & MSG_PEEK)) {
eac3731b 1303
aa8e71f5
HB		 1304 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1305 if (sk->sk_type == SOCK_STREAM) {
f9c41a62
UB		 1306 if (copied < rlen) {
1307 IUCV_SKB_CB(skb)->offset = offset + copied;
2f139a5d 1308 skb_queue_head(&sk->sk_receive_queue, skb);
aa8e71f5
HB		 1309 goto done;
1310 }
eac3731b
JH		 1311 }
1312
1313 kfree_skb(skb);
800c5eb7
UB		 1314 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1315 atomic_inc(&iucv->msg_recv);
1316 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1317 WARN_ON(1);
1318 iucv_sock_close(sk);
1319 return -EFAULT;
1320 }
1321 }
561e0360
JH		 1322
1323 /* Queue backlog skbs */
bf95d20f 1324 spin_lock_bh(&iucv->message_q.lock);
f0703c80 1325 rskb = skb_dequeue(&iucv->backlog_skb_q);
da99f056 1326 while (rskb) {
f9c41a62 1327 IUCV_SKB_CB(rskb)->offset = 0;
8c68b1a0
UB		 1328 if (__sock_queue_rcv_skb(sk, rskb)) {
1329 /* handle rcv queue full */
f0703c80 1330 skb_queue_head(&iucv->backlog_skb_q,
561e0360
JH		 1331 rskb);
1332 break;
561e0360 1333 }
8c68b1a0 1334 rskb = skb_dequeue(&iucv->backlog_skb_q);
561e0360 1335 }
f0703c80 1336 if (skb_queue_empty(&iucv->backlog_skb_q)) {
f0703c80
UB		 1337 if (!list_empty(&iucv->message_q.list))
1338 iucv_process_message_q(sk);
3881ac44
UB		 1339 if (atomic_read(&iucv->msg_recv) >=
1340 iucv->msglimit / 2) {
9fbd87d4 1341 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
3881ac44
UB		 1342 if (err) {
1343 sk->sk_state = IUCV_DISCONN;
1344 sk->sk_state_change(sk);
1345 }
1346 }
f0703c80 1347 }
bf95d20f 1348 spin_unlock_bh(&iucv->message_q.lock);
60d3705f 1349 }
eac3731b
JH		 1350
1351done:
aa8e71f5
HB		 1352 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1353 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1354 copied = rlen;
1355
1356 return copied;
eac3731b
JH		 1357}
1358
ade994f4 1359static inline __poll_t iucv_accept_poll(struct sock *parent)
eac3731b
JH		 1360{
1361 struct iucv_sock *isk, *n;
1362 struct sock *sk;
1363
da99f056 1364 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
eac3731b
JH		 1365 sk = (struct sock *) isk;
1366
1367 if (sk->sk_state == IUCV_CONNECTED)
a9a08845 1368 return EPOLLIN | EPOLLRDNORM;
eac3731b
JH		 1369 }
1370
1371 return 0;
1372}
1373
e9a36ca5
JW		 1374static __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1375 poll_table *wait)
eac3731b
JH		 1376{
1377 struct sock *sk = sock->sk;
ade994f4 1378 __poll_t mask = 0;
eac3731b 1379
89ab066d 1380 sock_poll_wait(file, sock, wait);
a11e1d43 1381
eac3731b
JH		 1382 if (sk->sk_state == IUCV_LISTEN)
1383 return iucv_accept_poll(sk);
1384
1385 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
a9a08845
LT		 1386 mask |= EPOLLERR |
1387 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
eac3731b
JH		 1388
1389 if (sk->sk_shutdown & RCV_SHUTDOWN)
a9a08845 1390 mask |= EPOLLRDHUP;
eac3731b
JH		 1391
1392 if (sk->sk_shutdown == SHUTDOWN_MASK)
a9a08845 1393 mask |= EPOLLHUP;
eac3731b
JH		 1394
1395 if (!skb_queue_empty(&sk->sk_receive_queue) ||
da99f056 1396 (sk->sk_shutdown & RCV_SHUTDOWN))
a9a08845 1397 mask |= EPOLLIN | EPOLLRDNORM;
eac3731b
JH		 1398
1399 if (sk->sk_state == IUCV_CLOSED)
a9a08845 1400 mask |= EPOLLHUP;
eac3731b 1401
aac6399c 1402 if (sk->sk_state == IUCV_DISCONN)
a9a08845 1403 mask |= EPOLLIN;
561e0360 1404
7f1b0ea4 1405 if (sock_writeable(sk) && iucv_below_msglim(sk))
a9a08845 1406 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
eac3731b 1407 else
9cd3e072 1408 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
eac3731b
JH		 1409
1410 return mask;
1411}
1412
1413static int iucv_sock_shutdown(struct socket *sock, int how)
1414{
1415 struct sock *sk = sock->sk;
1416 struct iucv_sock *iucv = iucv_sk(sk);
1417 struct iucv_message txmsg;
1418 int err = 0;
eac3731b
JH		 1419
1420 how++;
1421
1422 if ((how & ~SHUTDOWN_MASK) || !how)
1423 return -EINVAL;
1424
1425 lock_sock(sk);
da99f056 1426 switch (sk->sk_state) {
82492a35 1427 case IUCV_LISTEN:
e14ad5fa
HB		 1428 case IUCV_DISCONN:
1429 case IUCV_CLOSING:
eac3731b
JH		 1430 case IUCV_CLOSED:
1431 err = -ENOTCONN;
1432 goto fail;
eac3731b 1433 default:
eac3731b
JH		 1434 break;
1435 }
1436
4031eeaf
UB		 1437 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) &&
1438 sk->sk_state == IUCV_CONNECTED) {
82492a35
UB		 1439 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1440 txmsg.class = 0;
1441 txmsg.tag = 0;
1442 err = pr_iucv->message_send(iucv->path, &txmsg,
1443 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1444 if (err) {
1445 switch (err) {
1446 case 1:
1447 err = -ENOTCONN;
1448 break;
1449 case 2:
1450 err = -ECONNRESET;
1451 break;
1452 default:
1453 err = -ENOTCONN;
1454 break;
1455 }
eac3731b 1456 }
82492a35
UB		 1457 } else
1458 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
eac3731b
JH		 1459 }
1460
82492a35 1461 sk->sk_shutdown |= how;
eac3731b 1462 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1042cab8
UB		 1463 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1464 iucv->path) {
82492a35
UB		 1465 err = pr_iucv->path_quiesce(iucv->path, NULL);
1466 if (err)
1467 err = -ENOTCONN;
1468/* skb_queue_purge(&sk->sk_receive_queue); */
1469 }
eac3731b
JH		 1470 skb_queue_purge(&sk->sk_receive_queue);
1471 }
1472
1473 /* Wake up anyone sleeping in poll */
1474 sk->sk_state_change(sk);
1475
1476fail:
1477 release_sock(sk);
1478 return err;
1479}
1480
1481static int iucv_sock_release(struct socket *sock)
1482{
1483 struct sock *sk = sock->sk;
1484 int err = 0;
1485
1486 if (!sk)
1487 return 0;
1488
1489 iucv_sock_close(sk);
1490
eac3731b
JH		 1491 sock_orphan(sk);
1492 iucv_sock_kill(sk);
1493 return err;
1494}
1495
9d5c5d8f
HB		 1496/* getsockopt and setsockopt */
1497static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
a7b75c5a 1498 sockptr_t optval, unsigned int optlen)
9d5c5d8f
HB		 1499{
1500 struct sock *sk = sock->sk;
1501 struct iucv_sock *iucv = iucv_sk(sk);
1502 int val;
1503 int rc;
1504
1505 if (level != SOL_IUCV)
1506 return -ENOPROTOOPT;
1507
1508 if (optlen < sizeof(int))
1509 return -EINVAL;
1510
a7b75c5a 1511 if (copy_from_sockptr(&val, optval, sizeof(int)))
9d5c5d8f
HB		 1512 return -EFAULT;
1513
1514 rc = 0;
1515
1516 lock_sock(sk);
1517 switch (optname) {
1518 case SO_IPRMDATA_MSG:
1519 if (val)
1520 iucv->flags |= IUCV_IPRMDATA;
1521 else
1522 iucv->flags &= ~IUCV_IPRMDATA;
1523 break;
09488e2e
HB		 1524 case SO_MSGLIMIT:
1525 switch (sk->sk_state) {
1526 case IUCV_OPEN:
1527 case IUCV_BOUND:
0d1c7664 1528 if (val < 1 || val > U16_MAX)
09488e2e
HB		 1529 rc = -EINVAL;
1530 else
1531 iucv->msglimit = val;
1532 break;
1533 default:
1534 rc = -EINVAL;
1535 break;
1536 }
1537 break;
9d5c5d8f
HB		 1538 default:
1539 rc = -ENOPROTOOPT;
1540 break;
1541 }
1542 release_sock(sk);
1543
1544 return rc;
1545}
1546
1547static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1548 char __user *optval, int __user *optlen)
1549{
1550 struct sock *sk = sock->sk;
1551 struct iucv_sock *iucv = iucv_sk(sk);
51363b87
UB		 1552 unsigned int val;
1553 int len;
9d5c5d8f
HB		 1554
1555 if (level != SOL_IUCV)
1556 return -ENOPROTOOPT;
1557
1558 if (get_user(len, optlen))
1559 return -EFAULT;
1560
1561 if (len < 0)
1562 return -EINVAL;
1563
1564 len = min_t(unsigned int, len, sizeof(int));
1565
1566 switch (optname) {
1567 case SO_IPRMDATA_MSG:
1568 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1569 break;
09488e2e
HB		 1570 case SO_MSGLIMIT:
1571 lock_sock(sk);
1572 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1573 : iucv->msglimit; /* default */
1574 release_sock(sk);
1575 break;
51363b87
UB		 1576 case SO_MSGSIZE:
1577 if (sk->sk_state == IUCV_OPEN)
1578 return -EBADFD;
1579 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1580 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1581 0x7fffffff;
1582 break;
9d5c5d8f
HB		 1583 default:
1584 return -ENOPROTOOPT;
1585 }
1586
1587 if (put_user(len, optlen))
1588 return -EFAULT;
1589 if (copy_to_user(optval, &val, len))
1590 return -EFAULT;
1591
1592 return 0;
1593}
1594
1595
eac3731b
JH		 1596/* Callback wrappers - called from iucv base support */
1597static int iucv_callback_connreq(struct iucv_path *path,
1598 u8 ipvmid[8], u8 ipuser[16])
1599{
1600 unsigned char user_data[16];
1601 unsigned char nuser_data[16];
1602 unsigned char src_name[8];
eac3731b
JH		 1603 struct sock *sk, *nsk;
1604 struct iucv_sock *iucv, *niucv;
1605 int err;
1606
1607 memcpy(src_name, ipuser, 8);
1608 EBCASC(src_name, 8);
1609 /* Find out if this path belongs to af_iucv. */
1610 read_lock(&iucv_sk_list.lock);
1611 iucv = NULL;
febca281 1612 sk = NULL;
b67bfe0d 1613 sk_for_each(sk, &iucv_sk_list.head)
eac3731b
JH		 1614 if (sk->sk_state == IUCV_LISTEN &&
1615 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1616 /*
1617 * Found a listening socket with
1618 * src_name == ipuser[0-7].
1619 */
1620 iucv = iucv_sk(sk);
1621 break;
1622 }
1623 read_unlock(&iucv_sk_list.lock);
1624 if (!iucv)
1625 /* No socket found, not one of our paths. */
1626 return -EINVAL;
1627
1628 bh_lock_sock(sk);
1629
1630 /* Check if parent socket is listening */
1631 low_nmcpy(user_data, iucv->src_name);
1632 high_nmcpy(user_data, iucv->dst_name);
1633 ASCEBC(user_data, sizeof(user_data));
1634 if (sk->sk_state != IUCV_LISTEN) {
6fcd61f7 1635 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1636 iucv_path_free(path);
eac3731b
JH		 1637 goto fail;
1638 }
1639
1640 /* Check for backlog size */
1641 if (sk_acceptq_is_full(sk)) {
6fcd61f7 1642 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1643 iucv_path_free(path);
eac3731b
JH		 1644 goto fail;
1645 }
1646
1647 /* Create the new socket */
c5dab094 1648 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
da99f056 1649 if (!nsk) {
6fcd61f7 1650 err = pr_iucv->path_sever(path, user_data);
65dbd7c2 1651 iucv_path_free(path);
eac3731b
JH		 1652 goto fail;
1653 }
1654
1655 niucv = iucv_sk(nsk);
1656 iucv_sock_init(nsk, sk);
fdbf6326
JW		 1657 niucv->transport = AF_IUCV_TRANS_IUCV;
1658 nsk->sk_allocation |= GFP_DMA;
eac3731b
JH		 1659
1660 /* Set the new iucv_sock */
1661 memcpy(niucv->dst_name, ipuser + 8, 8);
1662 EBCASC(niucv->dst_name, 8);
1663 memcpy(niucv->dst_user_id, ipvmid, 8);
1664 memcpy(niucv->src_name, iucv->src_name, 8);
1665 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1666 niucv->path = path;
1667
1668 /* Call iucv_accept */
1669 high_nmcpy(nuser_data, ipuser + 8);
1670 memcpy(nuser_data + 8, niucv->src_name, 8);
1671 ASCEBC(nuser_data + 8, 8);
1672
09488e2e
HB		 1673 /* set message limit for path based on msglimit of accepting socket */
1674 niucv->msglimit = iucv->msglimit;
1675 path->msglim = iucv->msglimit;
6fcd61f7 1676 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
da99f056 1677 if (err) {
7d316b94 1678 iucv_sever_path(nsk, 1);
65dbd7c2 1679 iucv_sock_kill(nsk);
eac3731b
JH		 1680 goto fail;
1681 }
1682
1683 iucv_accept_enqueue(sk, nsk);
1684
1685 /* Wake up accept */
1686 nsk->sk_state = IUCV_CONNECTED;
676d2369 1687 sk->sk_data_ready(sk);
eac3731b
JH		 1688 err = 0;
1689fail:
1690 bh_unlock_sock(sk);
1691 return 0;
1692}
1693
1694static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1695{
1696 struct sock *sk = path->private;
1697
1698 sk->sk_state = IUCV_CONNECTED;
1699 sk->sk_state_change(sk);
1700}
1701
1702static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1703{
1704 struct sock *sk = path->private;
561e0360 1705 struct iucv_sock *iucv = iucv_sk(sk);
f0703c80
UB		 1706 struct sk_buff *skb;
1707 struct sock_msg_q *save_msg;
1708 int len;
561e0360 1709
fe86e54e 1710 if (sk->sk_shutdown & RCV_SHUTDOWN) {
6fcd61f7 1711 pr_iucv->message_reject(path, msg);
eac3731b 1712 return;
fe86e54e 1713 }
eac3731b 1714
3fa6b5ad 1715 spin_lock(&iucv->message_q.lock);
eac3731b 1716
f0703c80
UB		 1717 if (!list_empty(&iucv->message_q.list) ||
1718 !skb_queue_empty(&iucv->backlog_skb_q))
1719 goto save_message;
1720
1721 len = atomic_read(&sk->sk_rmem_alloc);
87fb4b7b 1722 len += SKB_TRUESIZE(iucv_msg_length(msg));
f0703c80
UB		 1723 if (len > sk->sk_rcvbuf)
1724 goto save_message;
1725
a006353a 1726 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
f0703c80
UB		 1727 if (!skb)
1728 goto save_message;
eac3731b 1729
f0703c80 1730 iucv_process_message(sk, skb, path, msg);
3fa6b5ad 1731 goto out_unlock;
eac3731b 1732
f0703c80
UB		 1733save_message:
1734 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
d4444722 1735 if (!save_msg)
a56635a5 1736 goto out_unlock;
f0703c80
UB		 1737 save_msg->path = path;
1738 save_msg->msg = *msg;
eac3731b 1739
f0703c80 1740 list_add_tail(&save_msg->list, &iucv->message_q.list);
3fa6b5ad
HB		 1741
1742out_unlock:
f0703c80 1743 spin_unlock(&iucv->message_q.lock);
eac3731b
JH		 1744}
1745
1746static void iucv_callback_txdone(struct iucv_path *path,
1747 struct iucv_message *msg)
1748{
1749 struct sock *sk = path->private;
f2a77991 1750 struct sk_buff *this = NULL;
eac3731b 1751 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
9e733177 1752 struct sk_buff *list_skb;
eac3731b
JH		 1753 unsigned long flags;
1754
7d316b94 1755 bh_lock_sock(sk);
561e0360 1756
9e733177
DM		 1757 spin_lock_irqsave(&list->lock, flags);
1758 skb_queue_walk(list, list_skb) {
1759 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1760 this = list_skb;
1761 break;
f2a77991 1762 }
9e733177
DM		 1763 }
1764 if (this)
1765 __skb_unlink(this, list);
1766 spin_unlock_irqrestore(&list->lock, flags);
eac3731b 1767
9e733177
DM		 1768 if (this) {
1769 kfree_skb(this);
1770 /* wake up any process waiting for sending */
1771 iucv_sock_wake_msglim(sk);
561e0360 1772 }
eac3731b 1773
da99f056 1774 if (sk->sk_state == IUCV_CLOSING) {
561e0360
JH		 1775 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1776 sk->sk_state = IUCV_CLOSED;
1777 sk->sk_state_change(sk);
1778 }
1779 }
7d316b94 1780 bh_unlock_sock(sk);
eac3731b 1781
eac3731b
JH		 1782}
1783
1784static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1785{
1786 struct sock *sk = path->private;
1787
7d316b94
UB		 1788 if (sk->sk_state == IUCV_CLOSED)
1789 return;
1790
1791 bh_lock_sock(sk);
1792 iucv_sever_path(sk, 1);
aac6399c 1793 sk->sk_state = IUCV_DISCONN;
eac3731b
JH		 1794
1795 sk->sk_state_change(sk);
7d316b94 1796 bh_unlock_sock(sk);
eac3731b
JH		 1797}
1798
af88b52d
HB		 1799/* called if the other communication side shuts down its RECV direction;
1800 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1801 */
1802static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1803{
1804 struct sock *sk = path->private;
1805
1806 bh_lock_sock(sk);
1807 if (sk->sk_state != IUCV_CLOSED) {
1808 sk->sk_shutdown |= SEND_SHUTDOWN;
1809 sk->sk_state_change(sk);
1810 }
1811 bh_unlock_sock(sk);
1812}
1813
3881ac44
UB		 1814/***************** HiperSockets transport callbacks ********************/
1815static void afiucv_swap_src_dest(struct sk_buff *skb)
1816{
cd11d112 1817 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
3881ac44
UB		 1818 char tmpID[8];
1819 char tmpName[8];
1820
1821 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1822 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1823 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1824 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1825 memcpy(tmpID, trans_hdr->srcUserID, 8);
1826 memcpy(tmpName, trans_hdr->srcAppName, 8);
1827 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1828 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1829 memcpy(trans_hdr->destUserID, tmpID, 8);
1830 memcpy(trans_hdr->destAppName, tmpName, 8);
1831 skb_push(skb, ETH_HLEN);
1832 memset(skb->data, 0, ETH_HLEN);
1833}
1834
1835/**
1836 * afiucv_hs_callback_syn - react on received SYN
1837 **/
1838static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1839{
cd11d112 1840 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
3881ac44
UB		 1841 struct sock *nsk;
1842 struct iucv_sock *iucv, *niucv;
3881ac44
UB		 1843 int err;
1844
1845 iucv = iucv_sk(sk);
3881ac44
UB		 1846 if (!iucv) {
1847 /* no sock - connection refused */
1848 afiucv_swap_src_dest(skb);
1849 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1850 err = dev_queue_xmit(skb);
1851 goto out;
1852 }
1853
c5dab094 1854 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
3881ac44
UB		 1855 bh_lock_sock(sk);
1856 if ((sk->sk_state != IUCV_LISTEN) ||
1857 sk_acceptq_is_full(sk) ||
1858 !nsk) {
1859 /* error on server socket - connection refused */
3881ac44
UB		 1860 afiucv_swap_src_dest(skb);
1861 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1862 err = dev_queue_xmit(skb);
4d520f62 1863 iucv_sock_kill(nsk);
3881ac44
UB		 1864 bh_unlock_sock(sk);
1865 goto out;
1866 }
1867
1868 niucv = iucv_sk(nsk);
1869 iucv_sock_init(nsk, sk);
1870 niucv->transport = AF_IUCV_TRANS_HIPER;
1871 niucv->msglimit = iucv->msglimit;
1872 if (!trans_hdr->window)
1873 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1874 else
1875 niucv->msglimit_peer = trans_hdr->window;
1876 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1877 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1878 memcpy(niucv->src_name, iucv->src_name, 8);
1879 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1880 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
800c5eb7
UB		 1881 niucv->hs_dev = iucv->hs_dev;
1882 dev_hold(niucv->hs_dev);
3881ac44
UB		 1883 afiucv_swap_src_dest(skb);
1884 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1885 trans_hdr->window = niucv->msglimit;
1886 /* if receiver acks the xmit connection is established */
1887 err = dev_queue_xmit(skb);
1888 if (!err) {
1889 iucv_accept_enqueue(sk, nsk);
1890 nsk->sk_state = IUCV_CONNECTED;
676d2369 1891 sk->sk_data_ready(sk);
3881ac44
UB		 1892 } else
1893 iucv_sock_kill(nsk);
1894 bh_unlock_sock(sk);
1895
1896out:
1897 return NET_RX_SUCCESS;
1898}
1899
1900/**
1901 * afiucv_hs_callback_synack() - react on received SYN-ACK
1902 **/
1903static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1904{
1905 struct iucv_sock *iucv = iucv_sk(sk);
3881ac44
UB		 1906
1907 if (!iucv)
1908 goto out;
1909 if (sk->sk_state != IUCV_BOUND)
1910 goto out;
1911 bh_lock_sock(sk);
cd11d112 1912 iucv->msglimit_peer = iucv_trans_hdr(skb)->window;
3881ac44
UB		 1913 sk->sk_state = IUCV_CONNECTED;
1914 sk->sk_state_change(sk);
1915 bh_unlock_sock(sk);
1916out:
1917 kfree_skb(skb);
1918 return NET_RX_SUCCESS;
1919}
1920
1921/**
1922 * afiucv_hs_callback_synfin() - react on received SYN_FIN
1923 **/
1924static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
1925{
1926 struct iucv_sock *iucv = iucv_sk(sk);
1927
1928 if (!iucv)
1929 goto out;
1930 if (sk->sk_state != IUCV_BOUND)
1931 goto out;
1932 bh_lock_sock(sk);
1933 sk->sk_state = IUCV_DISCONN;
1934 sk->sk_state_change(sk);
1935 bh_unlock_sock(sk);
1936out:
1937 kfree_skb(skb);
1938 return NET_RX_SUCCESS;
1939}
1940
1941/**
1942 * afiucv_hs_callback_fin() - react on received FIN
1943 **/
1944static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
1945{
1946 struct iucv_sock *iucv = iucv_sk(sk);
1947
1948 /* other end of connection closed */
800c5eb7
UB		 1949 if (!iucv)
1950 goto out;
1951 bh_lock_sock(sk);
1952 if (sk->sk_state == IUCV_CONNECTED) {
aac6399c 1953 sk->sk_state = IUCV_DISCONN;
3881ac44 1954 sk->sk_state_change(sk);
3881ac44 1955 }
800c5eb7
UB		 1956 bh_unlock_sock(sk);
1957out:
3881ac44
UB		 1958 kfree_skb(skb);
1959 return NET_RX_SUCCESS;
1960}
1961
1962/**
1963 * afiucv_hs_callback_win() - react on received WIN
1964 **/
1965static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
1966{
1967 struct iucv_sock *iucv = iucv_sk(sk);
3881ac44
UB		 1968
1969 if (!iucv)
1970 return NET_RX_SUCCESS;
1971
1972 if (sk->sk_state != IUCV_CONNECTED)
1973 return NET_RX_SUCCESS;
1974
cd11d112 1975 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent);
3881ac44
UB		 1976 iucv_sock_wake_msglim(sk);
1977 return NET_RX_SUCCESS;
1978}
1979
1980/**
1981 * afiucv_hs_callback_rx() - react on received data
1982 **/
1983static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
1984{
1985 struct iucv_sock *iucv = iucv_sk(sk);
1986
1987 if (!iucv) {
1988 kfree_skb(skb);
1989 return NET_RX_SUCCESS;
1990 }
1991
1992 if (sk->sk_state != IUCV_CONNECTED) {
1993 kfree_skb(skb);
1994 return NET_RX_SUCCESS;
1995 }
1996
82492a35
UB		 1997 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1998 kfree_skb(skb);
1999 return NET_RX_SUCCESS;
2000 }
2001
979f66b3 2002 /* write stuff from iucv_msg to skb cb */
3881ac44
UB		 2003 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2004 skb_reset_transport_header(skb);
2005 skb_reset_network_header(skb);
f9c41a62 2006 IUCV_SKB_CB(skb)->offset = 0;
8c68b1a0
UB		 2007 if (sk_filter(sk, skb)) {
2008 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2009 kfree_skb(skb);
2010 return NET_RX_SUCCESS;
2011 }
2012
3881ac44
UB		 2013 spin_lock(&iucv->message_q.lock);
2014 if (skb_queue_empty(&iucv->backlog_skb_q)) {
8c68b1a0 2015 if (__sock_queue_rcv_skb(sk, skb))
3881ac44
UB		 2016 /* handle rcv queue full */
2017 skb_queue_tail(&iucv->backlog_skb_q, skb);
3881ac44
UB		 2018 } else
2019 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2020 spin_unlock(&iucv->message_q.lock);
2021 return NET_RX_SUCCESS;
2022}
2023
2024/**
2025 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2026 * transport
2027 * called from netif RX softirq
2028 **/
2029static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2030 struct packet_type *pt, struct net_device *orig_dev)
2031{
3881ac44
UB		 2032 struct sock *sk;
2033 struct iucv_sock *iucv;
2034 struct af_iucv_trans_hdr *trans_hdr;
22244099 2035 int err = NET_RX_SUCCESS;
3881ac44 2036 char nullstring[8];
3881ac44 2037
cd11d112
JW		 2038 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) {
2039 WARN_ONCE(1, "AF_IUCV failed to receive skb, len=%u", skb->len);
979f66b3
EC		 2040 kfree_skb(skb);
2041 return NET_RX_SUCCESS;
2042 }
cd11d112
JW		 2043
2044 trans_hdr = iucv_trans_hdr(skb);
3881ac44
UB		 2045 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2046 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2047 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2048 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2049 memset(nullstring, 0, sizeof(nullstring));
2050 iucv = NULL;
2051 sk = NULL;
2052 read_lock(&iucv_sk_list.lock);
b67bfe0d 2053 sk_for_each(sk, &iucv_sk_list.head) {
3881ac44
UB		 2054 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2055 if ((!memcmp(&iucv_sk(sk)->src_name,
2056 trans_hdr->destAppName, 8)) &&
2057 (!memcmp(&iucv_sk(sk)->src_user_id,
2058 trans_hdr->destUserID, 8)) &&
2059 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2060 (!memcmp(&iucv_sk(sk)->dst_user_id,
2061 nullstring, 8))) {
2062 iucv = iucv_sk(sk);
2063 break;
2064 }
2065 } else {
2066 if ((!memcmp(&iucv_sk(sk)->src_name,
2067 trans_hdr->destAppName, 8)) &&
2068 (!memcmp(&iucv_sk(sk)->src_user_id,
2069 trans_hdr->destUserID, 8)) &&
2070 (!memcmp(&iucv_sk(sk)->dst_name,
2071 trans_hdr->srcAppName, 8)) &&
2072 (!memcmp(&iucv_sk(sk)->dst_user_id,
2073 trans_hdr->srcUserID, 8))) {
2074 iucv = iucv_sk(sk);
2075 break;
2076 }
2077 }
2078 }
2079 read_unlock(&iucv_sk_list.lock);
2080 if (!iucv)
2081 sk = NULL;
2082
2083 /* no sock
2084 how should we send with no sock
2085 1) send without sock no send rc checking?
2086 2) introduce default sock to handle this cases
2087
2088 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2089 data -> send FIN
2090 SYN|ACK, SYN|FIN, FIN -> no action? */
2091
2092 switch (trans_hdr->flags) {
2093 case AF_IUCV_FLAG_SYN:
2094 /* connect request */
2095 err = afiucv_hs_callback_syn(sk, skb);
2096 break;
2097 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2098 /* connect request confirmed */
2099 err = afiucv_hs_callback_synack(sk, skb);
2100 break;
2101 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2102 /* connect request refused */
2103 err = afiucv_hs_callback_synfin(sk, skb);
2104 break;
2105 case (AF_IUCV_FLAG_FIN):
2106 /* close request */
2107 err = afiucv_hs_callback_fin(sk, skb);
2108 break;
2109 case (AF_IUCV_FLAG_WIN):
2110 err = afiucv_hs_callback_win(sk, skb);
800c5eb7
UB		 2111 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2112 kfree_skb(skb);
2113 break;
2114 }
df561f66 2115 fallthrough; /* and receive non-zero length data */
82492a35
UB		 2116 case (AF_IUCV_FLAG_SHT):
2117 /* shutdown request */
df561f66 2118 fallthrough; /* and receive zero length data */
3881ac44
UB		 2119 case 0:
2120 /* plain data frame */
f9c41a62 2121 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
3881ac44
UB		 2122 err = afiucv_hs_callback_rx(sk, skb);
2123 break;
2124 default:
22244099 2125 kfree_skb(skb);
3881ac44
UB		 2126 }
2127
2128 return err;
2129}
2130
2131/**
2132 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2133 * transport
2134 **/
2135static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2136 enum iucv_tx_notify n)
2137{
2138 struct sock *isk = skb->sk;
2139 struct sock *sk = NULL;
2140 struct iucv_sock *iucv = NULL;
2141 struct sk_buff_head *list;
2142 struct sk_buff *list_skb;
800c5eb7 2143 struct sk_buff *nskb;
3881ac44 2144 unsigned long flags;
3881ac44 2145
800c5eb7 2146 read_lock_irqsave(&iucv_sk_list.lock, flags);
b67bfe0d 2147 sk_for_each(sk, &iucv_sk_list.head)
3881ac44
UB		 2148 if (sk == isk) {
2149 iucv = iucv_sk(sk);
2150 break;
2151 }
800c5eb7 2152 read_unlock_irqrestore(&iucv_sk_list.lock, flags);
3881ac44 2153
800c5eb7 2154 if (!iucv || sock_flag(sk, SOCK_ZAPPED))
3881ac44
UB		 2155 return;
2156
3881ac44 2157 list = &iucv->send_skb_q;
800c5eb7 2158 spin_lock_irqsave(&list->lock, flags);
9e733177 2159 skb_queue_walk_safe(list, list_skb, nskb) {
3881ac44 2160 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
3881ac44
UB		 2161 switch (n) {
2162 case TX_NOTIFY_OK:
800c5eb7
UB		 2163 __skb_unlink(list_skb, list);
2164 kfree_skb(list_skb);
3881ac44 2165 iucv_sock_wake_msglim(sk);
3881ac44
UB		 2166 break;
2167 case TX_NOTIFY_PENDING:
2168 atomic_inc(&iucv->pendings);
2169 break;
2170 case TX_NOTIFY_DELAYED_OK:
800c5eb7 2171 __skb_unlink(list_skb, list);
3881ac44
UB		 2172 atomic_dec(&iucv->pendings);
2173 if (atomic_read(&iucv->pendings) <= 0)
2174 iucv_sock_wake_msglim(sk);
800c5eb7 2175 kfree_skb(list_skb);
3881ac44
UB		 2176 break;
2177 case TX_NOTIFY_UNREACHABLE:
2178 case TX_NOTIFY_DELAYED_UNREACHABLE:
2179 case TX_NOTIFY_TPQFULL: /* not yet used */
2180 case TX_NOTIFY_GENERALERROR:
2181 case TX_NOTIFY_DELAYED_GENERALERROR:
800c5eb7
UB		 2182 __skb_unlink(list_skb, list);
2183 kfree_skb(list_skb);
2184 if (sk->sk_state == IUCV_CONNECTED) {
2185 sk->sk_state = IUCV_DISCONN;
2186 sk->sk_state_change(sk);
2187 }
3881ac44
UB		 2188 break;
2189 }
2190 break;
2191 }
3881ac44
UB		 2192 }
2193 spin_unlock_irqrestore(&list->lock, flags);
2194
42bd48e0
UB		 2195 if (sk->sk_state == IUCV_CLOSING) {
2196 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2197 sk->sk_state = IUCV_CLOSED;
2198 sk->sk_state_change(sk);
2199 }
2200 }
2201
3881ac44 2202}
9fbd87d4
UB		 2203
2204/*
2205 * afiucv_netdev_event: handle netdev notifier chain events
2206 */
2207static int afiucv_netdev_event(struct notifier_block *this,
2208 unsigned long event, void *ptr)
2209{
351638e7 2210 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
9fbd87d4
UB		 2211 struct sock *sk;
2212 struct iucv_sock *iucv;
2213
2214 switch (event) {
2215 case NETDEV_REBOOT:
2216 case NETDEV_GOING_DOWN:
b67bfe0d 2217 sk_for_each(sk, &iucv_sk_list.head) {
9fbd87d4
UB		 2218 iucv = iucv_sk(sk);
2219 if ((iucv->hs_dev == event_dev) &&
2220 (sk->sk_state == IUCV_CONNECTED)) {
2221 if (event == NETDEV_GOING_DOWN)
2222 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2223 sk->sk_state = IUCV_DISCONN;
2224 sk->sk_state_change(sk);
2225 }
2226 }
2227 break;
2228 case NETDEV_DOWN:
2229 case NETDEV_UNREGISTER:
2230 default:
2231 break;
2232 }
2233 return NOTIFY_DONE;
2234}
2235
2236static struct notifier_block afiucv_netdev_notifier = {
2237 .notifier_call = afiucv_netdev_event,
2238};
2239
5708e868 2240static const struct proto_ops iucv_sock_ops = {
eac3731b
JH		 2241 .family = PF_IUCV,
2242 .owner = THIS_MODULE,
2243 .release = iucv_sock_release,
2244 .bind = iucv_sock_bind,
2245 .connect = iucv_sock_connect,
2246 .listen = iucv_sock_listen,
2247 .accept = iucv_sock_accept,
2248 .getname = iucv_sock_getname,
2249 .sendmsg = iucv_sock_sendmsg,
2250 .recvmsg = iucv_sock_recvmsg,
a11e1d43 2251 .poll = iucv_sock_poll,
eac3731b
JH		 2252 .ioctl = sock_no_ioctl,
2253 .mmap = sock_no_mmap,
2254 .socketpair = sock_no_socketpair,
2255 .shutdown = iucv_sock_shutdown,
9d5c5d8f
HB		 2256 .setsockopt = iucv_sock_setsockopt,
2257 .getsockopt = iucv_sock_getsockopt,
eac3731b
JH		 2258};
2259
e9a36ca5
JW		 2260static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
2261 int kern)
2262{
2263 struct sock *sk;
2264
2265 if (protocol && protocol != PF_IUCV)
2266 return -EPROTONOSUPPORT;
2267
2268 sock->state = SS_UNCONNECTED;
2269
2270 switch (sock->type) {
2271 case SOCK_STREAM:
2272 case SOCK_SEQPACKET:
2273 /* currently, proto ops can handle both sk types */
2274 sock->ops = &iucv_sock_ops;
2275 break;
2276 default:
2277 return -ESOCKTNOSUPPORT;
2278 }
2279
2280 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
2281 if (!sk)
2282 return -ENOMEM;
2283
2284 iucv_sock_init(sk, NULL);
2285
2286 return 0;
2287}
2288
ec1b4cf7 2289static const struct net_proto_family iucv_sock_family_ops = {
eac3731b
JH		 2290 .family = AF_IUCV,
2291 .owner = THIS_MODULE,
2292 .create = iucv_sock_create,
2293};
2294
3881ac44
UB		 2295static struct packet_type iucv_packet_type = {
2296 .type = cpu_to_be16(ETH_P_AF_IUCV),
2297 .func = afiucv_hs_rcv,
2298};
2299
2300static int afiucv_iucv_init(void)
6fcd61f7 2301{
585bc220 2302 return pr_iucv->iucv_register(&af_iucv_handler, 0);
6fcd61f7
FB		 2303}
2304
06996c1d
JW		 2305static void afiucv_iucv_exit(void)
2306{
06996c1d
JW		 2307 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2308}
2309
da99f056 2310static int __init afiucv_init(void)
eac3731b
JH		 2311{
2312 int err;
2313
3881ac44
UB		 2314 if (MACHINE_IS_VM) {
2315 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2316 if (unlikely(err)) {
2317 WARN_ON(err);
2318 err = -EPROTONOSUPPORT;
2319 goto out;
2320 }
eac3731b 2321
3881ac44
UB		 2322 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2323 if (!pr_iucv) {
2324 printk(KERN_WARNING "iucv_if lookup failed\n");
2325 memset(&iucv_userid, 0, sizeof(iucv_userid));
2326 }
2327 } else {
2328 memset(&iucv_userid, 0, sizeof(iucv_userid));
2329 pr_iucv = NULL;
6fcd61f7
FB		 2330 }
2331
eac3731b
JH		 2332 err = proto_register(&iucv_proto, 0);
2333 if (err)
6fcd61f7 2334 goto out;
eac3731b
JH		 2335 err = sock_register(&iucv_sock_family_ops);
2336 if (err)
2337 goto out_proto;
6fcd61f7 2338
3881ac44
UB		 2339 if (pr_iucv) {
2340 err = afiucv_iucv_init();
2341 if (err)
2342 goto out_sock;
06996c1d
JW		 2343 }
2344
2345 err = register_netdevice_notifier(&afiucv_netdev_notifier);
2346 if (err)
2347 goto out_notifier;
2348
3881ac44 2349 dev_add_pack(&iucv_packet_type);
eac3731b
JH		 2350 return 0;
2351
06996c1d
JW		 2352out_notifier:
2353 if (pr_iucv)
2354 afiucv_iucv_exit();
c23cad92
UB		 2355out_sock:
2356 sock_unregister(PF_IUCV);
eac3731b
JH		 2357out_proto:
2358 proto_unregister(&iucv_proto);
eac3731b 2359out:
6fcd61f7
FB		 2360 if (pr_iucv)
2361 symbol_put(iucv_if);
eac3731b
JH		 2362 return err;
2363}
2364
2365static void __exit afiucv_exit(void)
2366{
3881ac44 2367 if (pr_iucv) {
06996c1d 2368 afiucv_iucv_exit();
3881ac44 2369 symbol_put(iucv_if);
06996c1d
JW		 2370 }
2371
2372 unregister_netdevice_notifier(&afiucv_netdev_notifier);
3881ac44 2373 dev_remove_pack(&iucv_packet_type);
eac3731b
JH		 2374 sock_unregister(PF_IUCV);
2375 proto_unregister(&iucv_proto);
eac3731b
JH		 2376}
2377
2378module_init(afiucv_init);
2379module_exit(afiucv_exit);
2380
2381MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2382MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2383MODULE_VERSION(VERSION);
2384MODULE_LICENSE("GPL");
2385MODULE_ALIAS_NETPROTO(PF_IUCV);
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