1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * IUCV protocol stack for Linux on zSeries
4 *
5 * Copyright IBM Corp. 2006, 2009
6 *
7 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
8 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
9 * PM functions:
10 * Ursula Braun <ursula.braun@de.ibm.com>
11 */
12
13 #define KMSG_COMPONENT "af_iucv"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16 #include <linux/module.h>
17 #include <linux/netdevice.h>
18 #include <linux/types.h>
19 #include <linux/limits.h>
20 #include <linux/list.h>
21 #include <linux/errno.h>
22 #include <linux/kernel.h>
23 #include <linux/sched/signal.h>
24 #include <linux/slab.h>
25 #include <linux/skbuff.h>
26 #include <linux/init.h>
27 #include <linux/poll.h>
28 #include <linux/security.h>
29 #include <net/sock.h>
30 #include <asm/ebcdic.h>
31 #include <asm/cpcmd.h>
32 #include <linux/kmod.h>
33
34 #include <net/iucv/af_iucv.h>
35
36 #define VERSION "1.2"
37
38 static char iucv_userid[80];
39
40 static struct proto iucv_proto = {
41 .name = "AF_IUCV",
42 .owner = THIS_MODULE,
43 .obj_size = sizeof(struct iucv_sock),
44 };
45
46 static struct iucv_interface *pr_iucv;
47
48 /* special AF_IUCV IPRM messages */
49 static const u8 iprm_shutdown[8] =
50 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
51
52 #define TRGCLS_SIZE sizeof_field(struct iucv_message, class)
53
54 #define __iucv_sock_wait(sk, condition, timeo, ret) \
55 do { \
56 DEFINE_WAIT(__wait); \
57 long __timeo = timeo; \
58 ret = 0; \
59 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \
60 while (!(condition)) { \
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 } \
76 finish_wait(sk_sleep(sk), &__wait); \
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 })
86
87 static struct sock *iucv_accept_dequeue(struct sock *parent,
88 struct socket *newsock);
89 static void iucv_sock_kill(struct sock *sk);
90 static void iucv_sock_close(struct sock *sk);
91
92 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify);
93
94 /* Call Back functions */
95 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
96 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
97 static void iucv_callback_connack(struct iucv_path *, u8 *);
98 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
99 static void iucv_callback_connrej(struct iucv_path *, u8 *);
100 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
101
102 static struct iucv_sock_list iucv_sk_list = {
103 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
104 .autobind_name = ATOMIC_INIT(0)
105 };
106
107 static 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,
112 .message_complete = iucv_callback_txdone,
113 .path_quiesced = iucv_callback_shutdown,
114 };
115
high_nmcpy(unsigned char * dst,char * src)116 static inline void high_nmcpy(unsigned char *dst, char *src)
117 {
118 memcpy(dst, src, 8);
119 }
120
low_nmcpy(unsigned char * dst,char * src)121 static inline void low_nmcpy(unsigned char *dst, char *src)
122 {
123 memcpy(&dst[8], src, 8);
124 }
125
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 *
138 * The socket data length is computed by subtracting the socket data length
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 */
iucv_msg_length(struct iucv_message * msg)146 static 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
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 */
iucv_sock_in_state(struct sock * sk,int state,int state2)165 static 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 */
iucv_below_msglim(struct sock * sk)178 static 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;
184 if (iucv->transport == AF_IUCV_TRANS_IUCV)
185 return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim);
186 else
187 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
188 (atomic_read(&iucv->pendings) <= 0));
189 }
190
191 /**
192 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
193 */
iucv_sock_wake_msglim(struct sock * sk)194 static void iucv_sock_wake_msglim(struct sock *sk)
195 {
196 struct socket_wq *wq;
197
198 rcu_read_lock();
199 wq = rcu_dereference(sk->sk_wq);
200 if (skwq_has_sleeper(wq))
201 wake_up_interruptible_all(&wq->wait);
202 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
203 rcu_read_unlock();
204 }
205
206 /**
207 * afiucv_hs_send() - send a message through HiperSockets transport
208 */
afiucv_hs_send(struct iucv_message * imsg,struct sock * sock,struct sk_buff * skb,u8 flags)209 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
210 struct sk_buff *skb, u8 flags)
211 {
212 struct iucv_sock *iucv = iucv_sk(sock);
213 struct af_iucv_trans_hdr *phs_hdr;
214 int err, confirm_recv = 0;
215
216 phs_hdr = skb_push(skb, sizeof(*phs_hdr));
217 memset(phs_hdr, 0, sizeof(*phs_hdr));
218 skb_reset_network_header(skb);
219
220 phs_hdr->magic = ETH_P_AF_IUCV;
221 phs_hdr->version = 1;
222 phs_hdr->flags = flags;
223 if (flags == AF_IUCV_FLAG_SYN)
224 phs_hdr->window = iucv->msglimit;
225 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
226 confirm_recv = atomic_read(&iucv->msg_recv);
227 phs_hdr->window = confirm_recv;
228 if (confirm_recv)
229 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
230 }
231 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
232 memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
233 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
234 memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
235 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
236 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
237 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
238 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
239 if (imsg)
240 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
241
242 skb->dev = iucv->hs_dev;
243 if (!skb->dev) {
244 err = -ENODEV;
245 goto err_free;
246 }
247
248 dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len);
249
250 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) {
251 err = -ENETDOWN;
252 goto err_free;
253 }
254 if (skb->len > skb->dev->mtu) {
255 if (sock->sk_type == SOCK_SEQPACKET) {
256 err = -EMSGSIZE;
257 goto err_free;
258 }
259 err = pskb_trim(skb, skb->dev->mtu);
260 if (err)
261 goto err_free;
262 }
263 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
264
265 atomic_inc(&iucv->skbs_in_xmit);
266 err = dev_queue_xmit(skb);
267 if (net_xmit_eval(err)) {
268 atomic_dec(&iucv->skbs_in_xmit);
269 } else {
270 atomic_sub(confirm_recv, &iucv->msg_recv);
271 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
272 }
273 return net_xmit_eval(err);
274
275 err_free:
276 kfree_skb(skb);
277 return err;
278 }
279
__iucv_get_sock_by_name(char * nm)280 static struct sock *__iucv_get_sock_by_name(char *nm)
281 {
282 struct sock *sk;
283
284 sk_for_each(sk, &iucv_sk_list.head)
285 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
286 return sk;
287
288 return NULL;
289 }
290
iucv_sock_destruct(struct sock * sk)291 static void iucv_sock_destruct(struct sock *sk)
292 {
293 skb_queue_purge(&sk->sk_receive_queue);
294 skb_queue_purge(&sk->sk_error_queue);
295
296 sk_mem_reclaim(sk);
297
298 if (!sock_flag(sk, SOCK_DEAD)) {
299 pr_err("Attempt to release alive iucv socket %p\n", sk);
300 return;
301 }
302
303 WARN_ON(atomic_read(&sk->sk_rmem_alloc));
304 WARN_ON(refcount_read(&sk->sk_wmem_alloc));
305 WARN_ON(sk->sk_wmem_queued);
306 WARN_ON(sk->sk_forward_alloc);
307 }
308
309 /* Cleanup Listen */
iucv_sock_cleanup_listen(struct sock * parent)310 static void iucv_sock_cleanup_listen(struct sock *parent)
311 {
312 struct sock *sk;
313
314 /* Close non-accepted connections */
315 while ((sk = iucv_accept_dequeue(parent, NULL))) {
316 iucv_sock_close(sk);
317 iucv_sock_kill(sk);
318 }
319
320 parent->sk_state = IUCV_CLOSED;
321 }
322
iucv_sock_link(struct iucv_sock_list * l,struct sock * sk)323 static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
324 {
325 write_lock_bh(&l->lock);
326 sk_add_node(sk, &l->head);
327 write_unlock_bh(&l->lock);
328 }
329
iucv_sock_unlink(struct iucv_sock_list * l,struct sock * sk)330 static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
331 {
332 write_lock_bh(&l->lock);
333 sk_del_node_init(sk);
334 write_unlock_bh(&l->lock);
335 }
336
337 /* Kill socket (only if zapped and orphaned) */
iucv_sock_kill(struct sock * sk)338 static void iucv_sock_kill(struct sock *sk)
339 {
340 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
341 return;
342
343 iucv_sock_unlink(&iucv_sk_list, sk);
344 sock_set_flag(sk, SOCK_DEAD);
345 sock_put(sk);
346 }
347
348 /* Terminate an IUCV path */
iucv_sever_path(struct sock * sk,int with_user_data)349 static void iucv_sever_path(struct sock *sk, int with_user_data)
350 {
351 unsigned char user_data[16];
352 struct iucv_sock *iucv = iucv_sk(sk);
353 struct iucv_path *path = iucv->path;
354
355 if (iucv->path) {
356 iucv->path = NULL;
357 if (with_user_data) {
358 low_nmcpy(user_data, iucv->src_name);
359 high_nmcpy(user_data, iucv->dst_name);
360 ASCEBC(user_data, sizeof(user_data));
361 pr_iucv->path_sever(path, user_data);
362 } else
363 pr_iucv->path_sever(path, NULL);
364 iucv_path_free(path);
365 }
366 }
367
368 /* Send controlling flags through an IUCV socket for HIPER transport */
iucv_send_ctrl(struct sock * sk,u8 flags)369 static int iucv_send_ctrl(struct sock *sk, u8 flags)
370 {
371 struct iucv_sock *iucv = iucv_sk(sk);
372 int err = 0;
373 int blen;
374 struct sk_buff *skb;
375 u8 shutdown = 0;
376
377 blen = sizeof(struct af_iucv_trans_hdr) +
378 LL_RESERVED_SPACE(iucv->hs_dev);
379 if (sk->sk_shutdown & SEND_SHUTDOWN) {
380 /* controlling flags should be sent anyway */
381 shutdown = sk->sk_shutdown;
382 sk->sk_shutdown &= RCV_SHUTDOWN;
383 }
384 skb = sock_alloc_send_skb(sk, blen, 1, &err);
385 if (skb) {
386 skb_reserve(skb, blen);
387 err = afiucv_hs_send(NULL, sk, skb, flags);
388 }
389 if (shutdown)
390 sk->sk_shutdown = shutdown;
391 return err;
392 }
393
394 /* Close an IUCV socket */
iucv_sock_close(struct sock * sk)395 static void iucv_sock_close(struct sock *sk)
396 {
397 struct iucv_sock *iucv = iucv_sk(sk);
398 unsigned long timeo;
399 int err = 0;
400
401 lock_sock(sk);
402
403 switch (sk->sk_state) {
404 case IUCV_LISTEN:
405 iucv_sock_cleanup_listen(sk);
406 break;
407
408 case IUCV_CONNECTED:
409 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
410 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
411 sk->sk_state = IUCV_DISCONN;
412 sk->sk_state_change(sk);
413 }
414 fallthrough;
415
416 case IUCV_DISCONN:
417 sk->sk_state = IUCV_CLOSING;
418 sk->sk_state_change(sk);
419
420 if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) {
421 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
422 timeo = sk->sk_lingertime;
423 else
424 timeo = IUCV_DISCONN_TIMEOUT;
425 iucv_sock_wait(sk,
426 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
427 timeo);
428 }
429 fallthrough;
430
431 case IUCV_CLOSING:
432 sk->sk_state = IUCV_CLOSED;
433 sk->sk_state_change(sk);
434
435 sk->sk_err = ECONNRESET;
436 sk->sk_state_change(sk);
437
438 skb_queue_purge(&iucv->send_skb_q);
439 skb_queue_purge(&iucv->backlog_skb_q);
440 fallthrough;
441
442 default:
443 iucv_sever_path(sk, 1);
444 }
445
446 if (iucv->hs_dev) {
447 dev_put(iucv->hs_dev);
448 iucv->hs_dev = NULL;
449 sk->sk_bound_dev_if = 0;
450 }
451
452 /* mark socket for deletion by iucv_sock_kill() */
453 sock_set_flag(sk, SOCK_ZAPPED);
454
455 release_sock(sk);
456 }
457
iucv_sock_init(struct sock * sk,struct sock * parent)458 static void iucv_sock_init(struct sock *sk, struct sock *parent)
459 {
460 if (parent) {
461 sk->sk_type = parent->sk_type;
462 security_sk_clone(parent, sk);
463 }
464 }
465
iucv_sock_alloc(struct socket * sock,int proto,gfp_t prio,int kern)466 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
467 {
468 struct sock *sk;
469 struct iucv_sock *iucv;
470
471 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
472 if (!sk)
473 return NULL;
474 iucv = iucv_sk(sk);
475
476 sock_init_data(sock, sk);
477 INIT_LIST_HEAD(&iucv->accept_q);
478 spin_lock_init(&iucv->accept_q_lock);
479 skb_queue_head_init(&iucv->send_skb_q);
480 INIT_LIST_HEAD(&iucv->message_q.list);
481 spin_lock_init(&iucv->message_q.lock);
482 skb_queue_head_init(&iucv->backlog_skb_q);
483 iucv->send_tag = 0;
484 atomic_set(&iucv->pendings, 0);
485 iucv->flags = 0;
486 iucv->msglimit = 0;
487 atomic_set(&iucv->skbs_in_xmit, 0);
488 atomic_set(&iucv->msg_sent, 0);
489 atomic_set(&iucv->msg_recv, 0);
490 iucv->path = NULL;
491 iucv->sk_txnotify = afiucv_hs_callback_txnotify;
492 memset(&iucv->src_user_id , 0, 32);
493 if (pr_iucv)
494 iucv->transport = AF_IUCV_TRANS_IUCV;
495 else
496 iucv->transport = AF_IUCV_TRANS_HIPER;
497
498 sk->sk_destruct = iucv_sock_destruct;
499 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
500
501 sock_reset_flag(sk, SOCK_ZAPPED);
502
503 sk->sk_protocol = proto;
504 sk->sk_state = IUCV_OPEN;
505
506 iucv_sock_link(&iucv_sk_list, sk);
507 return sk;
508 }
509
iucv_accept_enqueue(struct sock * parent,struct sock * sk)510 static void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
511 {
512 unsigned long flags;
513 struct iucv_sock *par = iucv_sk(parent);
514
515 sock_hold(sk);
516 spin_lock_irqsave(&par->accept_q_lock, flags);
517 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
518 spin_unlock_irqrestore(&par->accept_q_lock, flags);
519 iucv_sk(sk)->parent = parent;
520 sk_acceptq_added(parent);
521 }
522
iucv_accept_unlink(struct sock * sk)523 static void iucv_accept_unlink(struct sock *sk)
524 {
525 unsigned long flags;
526 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
527
528 spin_lock_irqsave(&par->accept_q_lock, flags);
529 list_del_init(&iucv_sk(sk)->accept_q);
530 spin_unlock_irqrestore(&par->accept_q_lock, flags);
531 sk_acceptq_removed(iucv_sk(sk)->parent);
532 iucv_sk(sk)->parent = NULL;
533 sock_put(sk);
534 }
535
iucv_accept_dequeue(struct sock * parent,struct socket * newsock)536 static struct sock *iucv_accept_dequeue(struct sock *parent,
537 struct socket *newsock)
538 {
539 struct iucv_sock *isk, *n;
540 struct sock *sk;
541
542 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
543 sk = (struct sock *) isk;
544 lock_sock(sk);
545
546 if (sk->sk_state == IUCV_CLOSED) {
547 iucv_accept_unlink(sk);
548 release_sock(sk);
549 continue;
550 }
551
552 if (sk->sk_state == IUCV_CONNECTED ||
553 sk->sk_state == IUCV_DISCONN ||
554 !newsock) {
555 iucv_accept_unlink(sk);
556 if (newsock)
557 sock_graft(sk, newsock);
558
559 release_sock(sk);
560 return sk;
561 }
562
563 release_sock(sk);
564 }
565 return NULL;
566 }
567
__iucv_auto_name(struct iucv_sock * iucv)568 static void __iucv_auto_name(struct iucv_sock *iucv)
569 {
570 char name[12];
571
572 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
573 while (__iucv_get_sock_by_name(name)) {
574 sprintf(name, "%08x",
575 atomic_inc_return(&iucv_sk_list.autobind_name));
576 }
577 memcpy(iucv->src_name, name, 8);
578 }
579
580 /* Bind an unbound socket */
iucv_sock_bind(struct socket * sock,struct sockaddr * addr,int addr_len)581 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
582 int addr_len)
583 {
584 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
585 char uid[sizeof(sa->siucv_user_id)];
586 struct sock *sk = sock->sk;
587 struct iucv_sock *iucv;
588 int err = 0;
589 struct net_device *dev;
590
591 /* Verify the input sockaddr */
592 if (addr_len < sizeof(struct sockaddr_iucv) ||
593 addr->sa_family != AF_IUCV)
594 return -EINVAL;
595
596 lock_sock(sk);
597 if (sk->sk_state != IUCV_OPEN) {
598 err = -EBADFD;
599 goto done;
600 }
601
602 write_lock_bh(&iucv_sk_list.lock);
603
604 iucv = iucv_sk(sk);
605 if (__iucv_get_sock_by_name(sa->siucv_name)) {
606 err = -EADDRINUSE;
607 goto done_unlock;
608 }
609 if (iucv->path)
610 goto done_unlock;
611
612 /* Bind the socket */
613 if (pr_iucv)
614 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
615 goto vm_bind; /* VM IUCV transport */
616
617 /* try hiper transport */
618 memcpy(uid, sa->siucv_user_id, sizeof(uid));
619 ASCEBC(uid, 8);
620 rcu_read_lock();
621 for_each_netdev_rcu(&init_net, dev) {
622 if (!memcmp(dev->perm_addr, uid, 8)) {
623 memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
624 /* Check for uninitialized siucv_name */
625 if (strncmp(sa->siucv_name, " ", 8) == 0)
626 __iucv_auto_name(iucv);
627 else
628 memcpy(iucv->src_name, sa->siucv_name, 8);
629 sk->sk_bound_dev_if = dev->ifindex;
630 iucv->hs_dev = dev;
631 dev_hold(dev);
632 sk->sk_state = IUCV_BOUND;
633 iucv->transport = AF_IUCV_TRANS_HIPER;
634 if (!iucv->msglimit)
635 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
636 rcu_read_unlock();
637 goto done_unlock;
638 }
639 }
640 rcu_read_unlock();
641 vm_bind:
642 if (pr_iucv) {
643 /* use local userid for backward compat */
644 memcpy(iucv->src_name, sa->siucv_name, 8);
645 memcpy(iucv->src_user_id, iucv_userid, 8);
646 sk->sk_state = IUCV_BOUND;
647 iucv->transport = AF_IUCV_TRANS_IUCV;
648 sk->sk_allocation |= GFP_DMA;
649 if (!iucv->msglimit)
650 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
651 goto done_unlock;
652 }
653 /* found no dev to bind */
654 err = -ENODEV;
655 done_unlock:
656 /* Release the socket list lock */
657 write_unlock_bh(&iucv_sk_list.lock);
658 done:
659 release_sock(sk);
660 return err;
661 }
662
663 /* Automatically bind an unbound socket */
iucv_sock_autobind(struct sock * sk)664 static int iucv_sock_autobind(struct sock *sk)
665 {
666 struct iucv_sock *iucv = iucv_sk(sk);
667 int err = 0;
668
669 if (unlikely(!pr_iucv))
670 return -EPROTO;
671
672 memcpy(iucv->src_user_id, iucv_userid, 8);
673 iucv->transport = AF_IUCV_TRANS_IUCV;
674 sk->sk_allocation |= GFP_DMA;
675
676 write_lock_bh(&iucv_sk_list.lock);
677 __iucv_auto_name(iucv);
678 write_unlock_bh(&iucv_sk_list.lock);
679
680 if (!iucv->msglimit)
681 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
682
683 return err;
684 }
685
afiucv_path_connect(struct socket * sock,struct sockaddr * addr)686 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
687 {
688 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
689 struct sock *sk = sock->sk;
690 struct iucv_sock *iucv = iucv_sk(sk);
691 unsigned char user_data[16];
692 int err;
693
694 high_nmcpy(user_data, sa->siucv_name);
695 low_nmcpy(user_data, iucv->src_name);
696 ASCEBC(user_data, sizeof(user_data));
697
698 /* Create path. */
699 iucv->path = iucv_path_alloc(iucv->msglimit,
700 IUCV_IPRMDATA, GFP_KERNEL);
701 if (!iucv->path) {
702 err = -ENOMEM;
703 goto done;
704 }
705 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
706 sa->siucv_user_id, NULL, user_data,
707 sk);
708 if (err) {
709 iucv_path_free(iucv->path);
710 iucv->path = NULL;
711 switch (err) {
712 case 0x0b: /* Target communicator is not logged on */
713 err = -ENETUNREACH;
714 break;
715 case 0x0d: /* Max connections for this guest exceeded */
716 case 0x0e: /* Max connections for target guest exceeded */
717 err = -EAGAIN;
718 break;
719 case 0x0f: /* Missing IUCV authorization */
720 err = -EACCES;
721 break;
722 default:
723 err = -ECONNREFUSED;
724 break;
725 }
726 }
727 done:
728 return err;
729 }
730
731 /* Connect an unconnected socket */
iucv_sock_connect(struct socket * sock,struct sockaddr * addr,int alen,int flags)732 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
733 int alen, int flags)
734 {
735 DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr);
736 struct sock *sk = sock->sk;
737 struct iucv_sock *iucv = iucv_sk(sk);
738 int err;
739
740 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
741 return -EINVAL;
742
743 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
744 return -EBADFD;
745
746 if (sk->sk_state == IUCV_OPEN &&
747 iucv->transport == AF_IUCV_TRANS_HIPER)
748 return -EBADFD; /* explicit bind required */
749
750 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
751 return -EINVAL;
752
753 if (sk->sk_state == IUCV_OPEN) {
754 err = iucv_sock_autobind(sk);
755 if (unlikely(err))
756 return err;
757 }
758
759 lock_sock(sk);
760
761 /* Set the destination information */
762 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
763 memcpy(iucv->dst_name, sa->siucv_name, 8);
764
765 if (iucv->transport == AF_IUCV_TRANS_HIPER)
766 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
767 else
768 err = afiucv_path_connect(sock, addr);
769 if (err)
770 goto done;
771
772 if (sk->sk_state != IUCV_CONNECTED)
773 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
774 IUCV_DISCONN),
775 sock_sndtimeo(sk, flags & O_NONBLOCK));
776
777 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
778 err = -ECONNREFUSED;
779
780 if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
781 iucv_sever_path(sk, 0);
782
783 done:
784 release_sock(sk);
785 return err;
786 }
787
788 /* Move a socket into listening state. */
iucv_sock_listen(struct socket * sock,int backlog)789 static int iucv_sock_listen(struct socket *sock, int backlog)
790 {
791 struct sock *sk = sock->sk;
792 int err;
793
794 lock_sock(sk);
795
796 err = -EINVAL;
797 if (sk->sk_state != IUCV_BOUND)
798 goto done;
799
800 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
801 goto done;
802
803 sk->sk_max_ack_backlog = backlog;
804 sk->sk_ack_backlog = 0;
805 sk->sk_state = IUCV_LISTEN;
806 err = 0;
807
808 done:
809 release_sock(sk);
810 return err;
811 }
812
813 /* Accept a pending connection */
iucv_sock_accept(struct socket * sock,struct socket * newsock,int flags,bool kern)814 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
815 int flags, bool kern)
816 {
817 DECLARE_WAITQUEUE(wait, current);
818 struct sock *sk = sock->sk, *nsk;
819 long timeo;
820 int err = 0;
821
822 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
823
824 if (sk->sk_state != IUCV_LISTEN) {
825 err = -EBADFD;
826 goto done;
827 }
828
829 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
830
831 /* Wait for an incoming connection */
832 add_wait_queue_exclusive(sk_sleep(sk), &wait);
833 while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
834 set_current_state(TASK_INTERRUPTIBLE);
835 if (!timeo) {
836 err = -EAGAIN;
837 break;
838 }
839
840 release_sock(sk);
841 timeo = schedule_timeout(timeo);
842 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
843
844 if (sk->sk_state != IUCV_LISTEN) {
845 err = -EBADFD;
846 break;
847 }
848
849 if (signal_pending(current)) {
850 err = sock_intr_errno(timeo);
851 break;
852 }
853 }
854
855 set_current_state(TASK_RUNNING);
856 remove_wait_queue(sk_sleep(sk), &wait);
857
858 if (err)
859 goto done;
860
861 newsock->state = SS_CONNECTED;
862
863 done:
864 release_sock(sk);
865 return err;
866 }
867
iucv_sock_getname(struct socket * sock,struct sockaddr * addr,int peer)868 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
869 int peer)
870 {
871 DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr);
872 struct sock *sk = sock->sk;
873 struct iucv_sock *iucv = iucv_sk(sk);
874
875 addr->sa_family = AF_IUCV;
876
877 if (peer) {
878 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
879 memcpy(siucv->siucv_name, iucv->dst_name, 8);
880 } else {
881 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
882 memcpy(siucv->siucv_name, iucv->src_name, 8);
883 }
884 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
885 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
886 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
887
888 return sizeof(struct sockaddr_iucv);
889 }
890
891 /**
892 * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
893 * @path: IUCV path
894 * @msg: Pointer to a struct iucv_message
895 * @skb: The socket data to send, skb->len MUST BE <= 7
896 *
897 * Send the socket data in the parameter list in the iucv message
898 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
899 * list and the socket data len at index 7 (last byte).
900 * See also iucv_msg_length().
901 *
902 * Returns the error code from the iucv_message_send() call.
903 */
iucv_send_iprm(struct iucv_path * path,struct iucv_message * msg,struct sk_buff * skb)904 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
905 struct sk_buff *skb)
906 {
907 u8 prmdata[8];
908
909 memcpy(prmdata, (void *) skb->data, skb->len);
910 prmdata[7] = 0xff - (u8) skb->len;
911 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
912 (void *) prmdata, 8);
913 }
914
iucv_sock_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)915 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
916 size_t len)
917 {
918 struct sock *sk = sock->sk;
919 struct iucv_sock *iucv = iucv_sk(sk);
920 size_t headroom = 0;
921 size_t linear;
922 struct sk_buff *skb;
923 struct iucv_message txmsg = {0};
924 struct cmsghdr *cmsg;
925 int cmsg_done;
926 long timeo;
927 char user_id[9];
928 char appl_id[9];
929 int err;
930 int noblock = msg->msg_flags & MSG_DONTWAIT;
931
932 err = sock_error(sk);
933 if (err)
934 return err;
935
936 if (msg->msg_flags & MSG_OOB)
937 return -EOPNOTSUPP;
938
939 /* SOCK_SEQPACKET: we do not support segmented records */
940 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
941 return -EOPNOTSUPP;
942
943 lock_sock(sk);
944
945 if (sk->sk_shutdown & SEND_SHUTDOWN) {
946 err = -EPIPE;
947 goto out;
948 }
949
950 /* Return if the socket is not in connected state */
951 if (sk->sk_state != IUCV_CONNECTED) {
952 err = -ENOTCONN;
953 goto out;
954 }
955
956 /* initialize defaults */
957 cmsg_done = 0; /* check for duplicate headers */
958
959 /* iterate over control messages */
960 for_each_cmsghdr(cmsg, msg) {
961 if (!CMSG_OK(msg, cmsg)) {
962 err = -EINVAL;
963 goto out;
964 }
965
966 if (cmsg->cmsg_level != SOL_IUCV)
967 continue;
968
969 if (cmsg->cmsg_type & cmsg_done) {
970 err = -EINVAL;
971 goto out;
972 }
973 cmsg_done |= cmsg->cmsg_type;
974
975 switch (cmsg->cmsg_type) {
976 case SCM_IUCV_TRGCLS:
977 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
978 err = -EINVAL;
979 goto out;
980 }
981
982 /* set iucv message target class */
983 memcpy(&txmsg.class,
984 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
985
986 break;
987
988 default:
989 err = -EINVAL;
990 goto out;
991 }
992 }
993
994 /* allocate one skb for each iucv message:
995 * this is fine for SOCK_SEQPACKET (unless we want to support
996 * segmented records using the MSG_EOR flag), but
997 * for SOCK_STREAM we might want to improve it in future */
998 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
999 headroom = sizeof(struct af_iucv_trans_hdr) +
1000 LL_RESERVED_SPACE(iucv->hs_dev);
1001 linear = min(len, PAGE_SIZE - headroom);
1002 } else {
1003 if (len < PAGE_SIZE) {
1004 linear = len;
1005 } else {
1006 /* In nonlinear "classic" iucv skb,
1007 * reserve space for iucv_array
1008 */
1009 headroom = sizeof(struct iucv_array) *
1010 (MAX_SKB_FRAGS + 1);
1011 linear = PAGE_SIZE - headroom;
1012 }
1013 }
1014 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1015 noblock, &err, 0);
1016 if (!skb)
1017 goto out;
1018 if (headroom)
1019 skb_reserve(skb, headroom);
1020 skb_put(skb, linear);
1021 skb->len = len;
1022 skb->data_len = len - linear;
1023 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1024 if (err)
1025 goto fail;
1026
1027 /* wait if outstanding messages for iucv path has reached */
1028 timeo = sock_sndtimeo(sk, noblock);
1029 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1030 if (err)
1031 goto fail;
1032
1033 /* return -ECONNRESET if the socket is no longer connected */
1034 if (sk->sk_state != IUCV_CONNECTED) {
1035 err = -ECONNRESET;
1036 goto fail;
1037 }
1038
1039 /* increment and save iucv message tag for msg_completion cbk */
1040 txmsg.tag = iucv->send_tag++;
1041 IUCV_SKB_CB(skb)->tag = txmsg.tag;
1042
1043 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1044 atomic_inc(&iucv->msg_sent);
1045 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1046 if (err) {
1047 atomic_dec(&iucv->msg_sent);
1048 goto out;
1049 }
1050 } else { /* Classic VM IUCV transport */
1051 skb_queue_tail(&iucv->send_skb_q, skb);
1052 atomic_inc(&iucv->skbs_in_xmit);
1053
1054 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1055 skb->len <= 7) {
1056 err = iucv_send_iprm(iucv->path, &txmsg, skb);
1057
1058 /* on success: there is no message_complete callback */
1059 /* for an IPRMDATA msg; remove skb from send queue */
1060 if (err == 0) {
1061 atomic_dec(&iucv->skbs_in_xmit);
1062 skb_unlink(skb, &iucv->send_skb_q);
1063 kfree_skb(skb);
1064 }
1065
1066 /* this error should never happen since the */
1067 /* IUCV_IPRMDATA path flag is set... sever path */
1068 if (err == 0x15) {
1069 pr_iucv->path_sever(iucv->path, NULL);
1070 atomic_dec(&iucv->skbs_in_xmit);
1071 skb_unlink(skb, &iucv->send_skb_q);
1072 err = -EPIPE;
1073 goto fail;
1074 }
1075 } else if (skb_is_nonlinear(skb)) {
1076 struct iucv_array *iba = (struct iucv_array *)skb->head;
1077 int i;
1078
1079 /* skip iucv_array lying in the headroom */
1080 iba[0].address = (u32)(addr_t)skb->data;
1081 iba[0].length = (u32)skb_headlen(skb);
1082 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1083 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1084
1085 iba[i + 1].address =
1086 (u32)(addr_t)skb_frag_address(frag);
1087 iba[i + 1].length = (u32)skb_frag_size(frag);
1088 }
1089 err = pr_iucv->message_send(iucv->path, &txmsg,
1090 IUCV_IPBUFLST, 0,
1091 (void *)iba, skb->len);
1092 } else { /* non-IPRM Linear skb */
1093 err = pr_iucv->message_send(iucv->path, &txmsg,
1094 0, 0, (void *)skb->data, skb->len);
1095 }
1096 if (err) {
1097 if (err == 3) {
1098 user_id[8] = 0;
1099 memcpy(user_id, iucv->dst_user_id, 8);
1100 appl_id[8] = 0;
1101 memcpy(appl_id, iucv->dst_name, 8);
1102 pr_err(
1103 "Application %s on z/VM guest %s exceeds message limit\n",
1104 appl_id, user_id);
1105 err = -EAGAIN;
1106 } else {
1107 err = -EPIPE;
1108 }
1109
1110 atomic_dec(&iucv->skbs_in_xmit);
1111 skb_unlink(skb, &iucv->send_skb_q);
1112 goto fail;
1113 }
1114 }
1115
1116 release_sock(sk);
1117 return len;
1118
1119 fail:
1120 kfree_skb(skb);
1121 out:
1122 release_sock(sk);
1123 return err;
1124 }
1125
alloc_iucv_recv_skb(unsigned long len)1126 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1127 {
1128 size_t headroom, linear;
1129 struct sk_buff *skb;
1130 int err;
1131
1132 if (len < PAGE_SIZE) {
1133 headroom = 0;
1134 linear = len;
1135 } else {
1136 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1137 linear = PAGE_SIZE - headroom;
1138 }
1139 skb = alloc_skb_with_frags(headroom + linear, len - linear,
1140 0, &err, GFP_ATOMIC | GFP_DMA);
1141 WARN_ONCE(!skb,
1142 "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1143 len, err);
1144 if (skb) {
1145 if (headroom)
1146 skb_reserve(skb, headroom);
1147 skb_put(skb, linear);
1148 skb->len = len;
1149 skb->data_len = len - linear;
1150 }
1151 return skb;
1152 }
1153
1154 /* iucv_process_message() - Receive a single outstanding IUCV message
1155 *
1156 * Locking: must be called with message_q.lock held
1157 */
iucv_process_message(struct sock * sk,struct sk_buff * skb,struct iucv_path * path,struct iucv_message * msg)1158 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1159 struct iucv_path *path,
1160 struct iucv_message *msg)
1161 {
1162 int rc;
1163 unsigned int len;
1164
1165 len = iucv_msg_length(msg);
1166
1167 /* store msg target class in the second 4 bytes of skb ctrl buffer */
1168 /* Note: the first 4 bytes are reserved for msg tag */
1169 IUCV_SKB_CB(skb)->class = msg->class;
1170
1171 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1172 if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1173 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1174 skb->data = NULL;
1175 skb->len = 0;
1176 }
1177 } else {
1178 if (skb_is_nonlinear(skb)) {
1179 struct iucv_array *iba = (struct iucv_array *)skb->head;
1180 int i;
1181
1182 iba[0].address = (u32)(addr_t)skb->data;
1183 iba[0].length = (u32)skb_headlen(skb);
1184 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1185 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1186
1187 iba[i + 1].address =
1188 (u32)(addr_t)skb_frag_address(frag);
1189 iba[i + 1].length = (u32)skb_frag_size(frag);
1190 }
1191 rc = pr_iucv->message_receive(path, msg,
1192 IUCV_IPBUFLST,
1193 (void *)iba, len, NULL);
1194 } else {
1195 rc = pr_iucv->message_receive(path, msg,
1196 msg->flags & IUCV_IPRMDATA,
1197 skb->data, len, NULL);
1198 }
1199 if (rc) {
1200 kfree_skb(skb);
1201 return;
1202 }
1203 WARN_ON_ONCE(skb->len != len);
1204 }
1205
1206 IUCV_SKB_CB(skb)->offset = 0;
1207 if (sk_filter(sk, skb)) {
1208 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
1209 kfree_skb(skb);
1210 return;
1211 }
1212 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */
1213 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1214 }
1215
1216 /* iucv_process_message_q() - Process outstanding IUCV messages
1217 *
1218 * Locking: must be called with message_q.lock held
1219 */
iucv_process_message_q(struct sock * sk)1220 static void iucv_process_message_q(struct sock *sk)
1221 {
1222 struct iucv_sock *iucv = iucv_sk(sk);
1223 struct sk_buff *skb;
1224 struct sock_msg_q *p, *n;
1225
1226 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1227 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1228 if (!skb)
1229 break;
1230 iucv_process_message(sk, skb, p->path, &p->msg);
1231 list_del(&p->list);
1232 kfree(p);
1233 if (!skb_queue_empty(&iucv->backlog_skb_q))
1234 break;
1235 }
1236 }
1237
iucv_sock_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)1238 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1239 size_t len, int flags)
1240 {
1241 int noblock = flags & MSG_DONTWAIT;
1242 struct sock *sk = sock->sk;
1243 struct iucv_sock *iucv = iucv_sk(sk);
1244 unsigned int copied, rlen;
1245 struct sk_buff *skb, *rskb, *cskb;
1246 int err = 0;
1247 u32 offset;
1248
1249 if ((sk->sk_state == IUCV_DISCONN) &&
1250 skb_queue_empty(&iucv->backlog_skb_q) &&
1251 skb_queue_empty(&sk->sk_receive_queue) &&
1252 list_empty(&iucv->message_q.list))
1253 return 0;
1254
1255 if (flags & (MSG_OOB))
1256 return -EOPNOTSUPP;
1257
1258 /* receive/dequeue next skb:
1259 * the function understands MSG_PEEK and, thus, does not dequeue skb */
1260 skb = skb_recv_datagram(sk, flags, noblock, &err);
1261 if (!skb) {
1262 if (sk->sk_shutdown & RCV_SHUTDOWN)
1263 return 0;
1264 return err;
1265 }
1266
1267 offset = IUCV_SKB_CB(skb)->offset;
1268 rlen = skb->len - offset; /* real length of skb */
1269 copied = min_t(unsigned int, rlen, len);
1270 if (!rlen)
1271 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1272
1273 cskb = skb;
1274 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1275 if (!(flags & MSG_PEEK))
1276 skb_queue_head(&sk->sk_receive_queue, skb);
1277 return -EFAULT;
1278 }
1279
1280 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1281 if (sk->sk_type == SOCK_SEQPACKET) {
1282 if (copied < rlen)
1283 msg->msg_flags |= MSG_TRUNC;
1284 /* each iucv message contains a complete record */
1285 msg->msg_flags |= MSG_EOR;
1286 }
1287
1288 /* create control message to store iucv msg target class:
1289 * get the trgcls from the control buffer of the skb due to
1290 * fragmentation of original iucv message. */
1291 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1292 sizeof(IUCV_SKB_CB(skb)->class),
1293 (void *)&IUCV_SKB_CB(skb)->class);
1294 if (err) {
1295 if (!(flags & MSG_PEEK))
1296 skb_queue_head(&sk->sk_receive_queue, skb);
1297 return err;
1298 }
1299
1300 /* Mark read part of skb as used */
1301 if (!(flags & MSG_PEEK)) {
1302
1303 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1304 if (sk->sk_type == SOCK_STREAM) {
1305 if (copied < rlen) {
1306 IUCV_SKB_CB(skb)->offset = offset + copied;
1307 skb_queue_head(&sk->sk_receive_queue, skb);
1308 goto done;
1309 }
1310 }
1311
1312 kfree_skb(skb);
1313 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1314 atomic_inc(&iucv->msg_recv);
1315 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1316 WARN_ON(1);
1317 iucv_sock_close(sk);
1318 return -EFAULT;
1319 }
1320 }
1321
1322 /* Queue backlog skbs */
1323 spin_lock_bh(&iucv->message_q.lock);
1324 rskb = skb_dequeue(&iucv->backlog_skb_q);
1325 while (rskb) {
1326 IUCV_SKB_CB(rskb)->offset = 0;
1327 if (__sock_queue_rcv_skb(sk, rskb)) {
1328 /* handle rcv queue full */
1329 skb_queue_head(&iucv->backlog_skb_q,
1330 rskb);
1331 break;
1332 }
1333 rskb = skb_dequeue(&iucv->backlog_skb_q);
1334 }
1335 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1336 if (!list_empty(&iucv->message_q.list))
1337 iucv_process_message_q(sk);
1338 if (atomic_read(&iucv->msg_recv) >=
1339 iucv->msglimit / 2) {
1340 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1341 if (err) {
1342 sk->sk_state = IUCV_DISCONN;
1343 sk->sk_state_change(sk);
1344 }
1345 }
1346 }
1347 spin_unlock_bh(&iucv->message_q.lock);
1348 }
1349
1350 done:
1351 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1352 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1353 copied = rlen;
1354
1355 return copied;
1356 }
1357
iucv_accept_poll(struct sock * parent)1358 static inline __poll_t iucv_accept_poll(struct sock *parent)
1359 {
1360 struct iucv_sock *isk, *n;
1361 struct sock *sk;
1362
1363 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1364 sk = (struct sock *) isk;
1365
1366 if (sk->sk_state == IUCV_CONNECTED)
1367 return EPOLLIN | EPOLLRDNORM;
1368 }
1369
1370 return 0;
1371 }
1372
iucv_sock_poll(struct file * file,struct socket * sock,poll_table * wait)1373 static __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1374 poll_table *wait)
1375 {
1376 struct sock *sk = sock->sk;
1377 __poll_t mask = 0;
1378
1379 sock_poll_wait(file, sock, wait);
1380
1381 if (sk->sk_state == IUCV_LISTEN)
1382 return iucv_accept_poll(sk);
1383
1384 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1385 mask |= EPOLLERR |
1386 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1387
1388 if (sk->sk_shutdown & RCV_SHUTDOWN)
1389 mask |= EPOLLRDHUP;
1390
1391 if (sk->sk_shutdown == SHUTDOWN_MASK)
1392 mask |= EPOLLHUP;
1393
1394 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1395 (sk->sk_shutdown & RCV_SHUTDOWN))
1396 mask |= EPOLLIN | EPOLLRDNORM;
1397
1398 if (sk->sk_state == IUCV_CLOSED)
1399 mask |= EPOLLHUP;
1400
1401 if (sk->sk_state == IUCV_DISCONN)
1402 mask |= EPOLLIN;
1403
1404 if (sock_writeable(sk) && iucv_below_msglim(sk))
1405 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1406 else
1407 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1408
1409 return mask;
1410 }
1411
iucv_sock_shutdown(struct socket * sock,int how)1412 static int iucv_sock_shutdown(struct socket *sock, int how)
1413 {
1414 struct sock *sk = sock->sk;
1415 struct iucv_sock *iucv = iucv_sk(sk);
1416 struct iucv_message txmsg;
1417 int err = 0;
1418
1419 how++;
1420
1421 if ((how & ~SHUTDOWN_MASK) || !how)
1422 return -EINVAL;
1423
1424 lock_sock(sk);
1425 switch (sk->sk_state) {
1426 case IUCV_LISTEN:
1427 case IUCV_DISCONN:
1428 case IUCV_CLOSING:
1429 case IUCV_CLOSED:
1430 err = -ENOTCONN;
1431 goto fail;
1432 default:
1433 break;
1434 }
1435
1436 if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) &&
1437 sk->sk_state == IUCV_CONNECTED) {
1438 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1439 txmsg.class = 0;
1440 txmsg.tag = 0;
1441 err = pr_iucv->message_send(iucv->path, &txmsg,
1442 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1443 if (err) {
1444 switch (err) {
1445 case 1:
1446 err = -ENOTCONN;
1447 break;
1448 case 2:
1449 err = -ECONNRESET;
1450 break;
1451 default:
1452 err = -ENOTCONN;
1453 break;
1454 }
1455 }
1456 } else
1457 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1458 }
1459
1460 sk->sk_shutdown |= how;
1461 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1462 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1463 iucv->path) {
1464 err = pr_iucv->path_quiesce(iucv->path, NULL);
1465 if (err)
1466 err = -ENOTCONN;
1467 /* skb_queue_purge(&sk->sk_receive_queue); */
1468 }
1469 skb_queue_purge(&sk->sk_receive_queue);
1470 }
1471
1472 /* Wake up anyone sleeping in poll */
1473 sk->sk_state_change(sk);
1474
1475 fail:
1476 release_sock(sk);
1477 return err;
1478 }
1479
iucv_sock_release(struct socket * sock)1480 static int iucv_sock_release(struct socket *sock)
1481 {
1482 struct sock *sk = sock->sk;
1483 int err = 0;
1484
1485 if (!sk)
1486 return 0;
1487
1488 iucv_sock_close(sk);
1489
1490 sock_orphan(sk);
1491 iucv_sock_kill(sk);
1492 return err;
1493 }
1494
1495 /* getsockopt and setsockopt */
iucv_sock_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)1496 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1497 sockptr_t optval, unsigned int optlen)
1498 {
1499 struct sock *sk = sock->sk;
1500 struct iucv_sock *iucv = iucv_sk(sk);
1501 int val;
1502 int rc;
1503
1504 if (level != SOL_IUCV)
1505 return -ENOPROTOOPT;
1506
1507 if (optlen < sizeof(int))
1508 return -EINVAL;
1509
1510 if (copy_from_sockptr(&val, optval, sizeof(int)))
1511 return -EFAULT;
1512
1513 rc = 0;
1514
1515 lock_sock(sk);
1516 switch (optname) {
1517 case SO_IPRMDATA_MSG:
1518 if (val)
1519 iucv->flags |= IUCV_IPRMDATA;
1520 else
1521 iucv->flags &= ~IUCV_IPRMDATA;
1522 break;
1523 case SO_MSGLIMIT:
1524 switch (sk->sk_state) {
1525 case IUCV_OPEN:
1526 case IUCV_BOUND:
1527 if (val < 1 || val > U16_MAX)
1528 rc = -EINVAL;
1529 else
1530 iucv->msglimit = val;
1531 break;
1532 default:
1533 rc = -EINVAL;
1534 break;
1535 }
1536 break;
1537 default:
1538 rc = -ENOPROTOOPT;
1539 break;
1540 }
1541 release_sock(sk);
1542
1543 return rc;
1544 }
1545
iucv_sock_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)1546 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1547 char __user *optval, int __user *optlen)
1548 {
1549 struct sock *sk = sock->sk;
1550 struct iucv_sock *iucv = iucv_sk(sk);
1551 unsigned int val;
1552 int len;
1553
1554 if (level != SOL_IUCV)
1555 return -ENOPROTOOPT;
1556
1557 if (get_user(len, optlen))
1558 return -EFAULT;
1559
1560 if (len < 0)
1561 return -EINVAL;
1562
1563 len = min_t(unsigned int, len, sizeof(int));
1564
1565 switch (optname) {
1566 case SO_IPRMDATA_MSG:
1567 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1568 break;
1569 case SO_MSGLIMIT:
1570 lock_sock(sk);
1571 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1572 : iucv->msglimit; /* default */
1573 release_sock(sk);
1574 break;
1575 case SO_MSGSIZE:
1576 if (sk->sk_state == IUCV_OPEN)
1577 return -EBADFD;
1578 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1579 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1580 0x7fffffff;
1581 break;
1582 default:
1583 return -ENOPROTOOPT;
1584 }
1585
1586 if (put_user(len, optlen))
1587 return -EFAULT;
1588 if (copy_to_user(optval, &val, len))
1589 return -EFAULT;
1590
1591 return 0;
1592 }
1593
1594
1595 /* Callback wrappers - called from iucv base support */
iucv_callback_connreq(struct iucv_path * path,u8 ipvmid[8],u8 ipuser[16])1596 static int iucv_callback_connreq(struct iucv_path *path,
1597 u8 ipvmid[8], u8 ipuser[16])
1598 {
1599 unsigned char user_data[16];
1600 unsigned char nuser_data[16];
1601 unsigned char src_name[8];
1602 struct sock *sk, *nsk;
1603 struct iucv_sock *iucv, *niucv;
1604 int err;
1605
1606 memcpy(src_name, ipuser, 8);
1607 EBCASC(src_name, 8);
1608 /* Find out if this path belongs to af_iucv. */
1609 read_lock(&iucv_sk_list.lock);
1610 iucv = NULL;
1611 sk = NULL;
1612 sk_for_each(sk, &iucv_sk_list.head)
1613 if (sk->sk_state == IUCV_LISTEN &&
1614 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1615 /*
1616 * Found a listening socket with
1617 * src_name == ipuser[0-7].
1618 */
1619 iucv = iucv_sk(sk);
1620 break;
1621 }
1622 read_unlock(&iucv_sk_list.lock);
1623 if (!iucv)
1624 /* No socket found, not one of our paths. */
1625 return -EINVAL;
1626
1627 bh_lock_sock(sk);
1628
1629 /* Check if parent socket is listening */
1630 low_nmcpy(user_data, iucv->src_name);
1631 high_nmcpy(user_data, iucv->dst_name);
1632 ASCEBC(user_data, sizeof(user_data));
1633 if (sk->sk_state != IUCV_LISTEN) {
1634 err = pr_iucv->path_sever(path, user_data);
1635 iucv_path_free(path);
1636 goto fail;
1637 }
1638
1639 /* Check for backlog size */
1640 if (sk_acceptq_is_full(sk)) {
1641 err = pr_iucv->path_sever(path, user_data);
1642 iucv_path_free(path);
1643 goto fail;
1644 }
1645
1646 /* Create the new socket */
1647 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1648 if (!nsk) {
1649 err = pr_iucv->path_sever(path, user_data);
1650 iucv_path_free(path);
1651 goto fail;
1652 }
1653
1654 niucv = iucv_sk(nsk);
1655 iucv_sock_init(nsk, sk);
1656 niucv->transport = AF_IUCV_TRANS_IUCV;
1657 nsk->sk_allocation |= GFP_DMA;
1658
1659 /* Set the new iucv_sock */
1660 memcpy(niucv->dst_name, ipuser + 8, 8);
1661 EBCASC(niucv->dst_name, 8);
1662 memcpy(niucv->dst_user_id, ipvmid, 8);
1663 memcpy(niucv->src_name, iucv->src_name, 8);
1664 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1665 niucv->path = path;
1666
1667 /* Call iucv_accept */
1668 high_nmcpy(nuser_data, ipuser + 8);
1669 memcpy(nuser_data + 8, niucv->src_name, 8);
1670 ASCEBC(nuser_data + 8, 8);
1671
1672 /* set message limit for path based on msglimit of accepting socket */
1673 niucv->msglimit = iucv->msglimit;
1674 path->msglim = iucv->msglimit;
1675 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1676 if (err) {
1677 iucv_sever_path(nsk, 1);
1678 iucv_sock_kill(nsk);
1679 goto fail;
1680 }
1681
1682 iucv_accept_enqueue(sk, nsk);
1683
1684 /* Wake up accept */
1685 nsk->sk_state = IUCV_CONNECTED;
1686 sk->sk_data_ready(sk);
1687 err = 0;
1688 fail:
1689 bh_unlock_sock(sk);
1690 return 0;
1691 }
1692
iucv_callback_connack(struct iucv_path * path,u8 ipuser[16])1693 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1694 {
1695 struct sock *sk = path->private;
1696
1697 sk->sk_state = IUCV_CONNECTED;
1698 sk->sk_state_change(sk);
1699 }
1700
iucv_callback_rx(struct iucv_path * path,struct iucv_message * msg)1701 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1702 {
1703 struct sock *sk = path->private;
1704 struct iucv_sock *iucv = iucv_sk(sk);
1705 struct sk_buff *skb;
1706 struct sock_msg_q *save_msg;
1707 int len;
1708
1709 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1710 pr_iucv->message_reject(path, msg);
1711 return;
1712 }
1713
1714 spin_lock(&iucv->message_q.lock);
1715
1716 if (!list_empty(&iucv->message_q.list) ||
1717 !skb_queue_empty(&iucv->backlog_skb_q))
1718 goto save_message;
1719
1720 len = atomic_read(&sk->sk_rmem_alloc);
1721 len += SKB_TRUESIZE(iucv_msg_length(msg));
1722 if (len > sk->sk_rcvbuf)
1723 goto save_message;
1724
1725 skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1726 if (!skb)
1727 goto save_message;
1728
1729 iucv_process_message(sk, skb, path, msg);
1730 goto out_unlock;
1731
1732 save_message:
1733 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1734 if (!save_msg)
1735 goto out_unlock;
1736 save_msg->path = path;
1737 save_msg->msg = *msg;
1738
1739 list_add_tail(&save_msg->list, &iucv->message_q.list);
1740
1741 out_unlock:
1742 spin_unlock(&iucv->message_q.lock);
1743 }
1744
iucv_callback_txdone(struct iucv_path * path,struct iucv_message * msg)1745 static void iucv_callback_txdone(struct iucv_path *path,
1746 struct iucv_message *msg)
1747 {
1748 struct sock *sk = path->private;
1749 struct sk_buff *this = NULL;
1750 struct sk_buff_head *list;
1751 struct sk_buff *list_skb;
1752 struct iucv_sock *iucv;
1753 unsigned long flags;
1754
1755 iucv = iucv_sk(sk);
1756 list = &iucv->send_skb_q;
1757
1758 bh_lock_sock(sk);
1759
1760 spin_lock_irqsave(&list->lock, flags);
1761 skb_queue_walk(list, list_skb) {
1762 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1763 this = list_skb;
1764 break;
1765 }
1766 }
1767 if (this) {
1768 atomic_dec(&iucv->skbs_in_xmit);
1769 __skb_unlink(this, list);
1770 }
1771
1772 spin_unlock_irqrestore(&list->lock, flags);
1773
1774 if (this) {
1775 kfree_skb(this);
1776 /* wake up any process waiting for sending */
1777 iucv_sock_wake_msglim(sk);
1778 }
1779
1780 if (sk->sk_state == IUCV_CLOSING) {
1781 if (atomic_read(&iucv->skbs_in_xmit) == 0) {
1782 sk->sk_state = IUCV_CLOSED;
1783 sk->sk_state_change(sk);
1784 }
1785 }
1786 bh_unlock_sock(sk);
1787
1788 }
1789
iucv_callback_connrej(struct iucv_path * path,u8 ipuser[16])1790 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1791 {
1792 struct sock *sk = path->private;
1793
1794 if (sk->sk_state == IUCV_CLOSED)
1795 return;
1796
1797 bh_lock_sock(sk);
1798 iucv_sever_path(sk, 1);
1799 sk->sk_state = IUCV_DISCONN;
1800
1801 sk->sk_state_change(sk);
1802 bh_unlock_sock(sk);
1803 }
1804
1805 /* called if the other communication side shuts down its RECV direction;
1806 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1807 */
iucv_callback_shutdown(struct iucv_path * path,u8 ipuser[16])1808 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1809 {
1810 struct sock *sk = path->private;
1811
1812 bh_lock_sock(sk);
1813 if (sk->sk_state != IUCV_CLOSED) {
1814 sk->sk_shutdown |= SEND_SHUTDOWN;
1815 sk->sk_state_change(sk);
1816 }
1817 bh_unlock_sock(sk);
1818 }
1819
1820 /***************** HiperSockets transport callbacks ********************/
afiucv_swap_src_dest(struct sk_buff * skb)1821 static void afiucv_swap_src_dest(struct sk_buff *skb)
1822 {
1823 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1824 char tmpID[8];
1825 char tmpName[8];
1826
1827 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1828 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1829 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1830 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1831 memcpy(tmpID, trans_hdr->srcUserID, 8);
1832 memcpy(tmpName, trans_hdr->srcAppName, 8);
1833 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1834 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1835 memcpy(trans_hdr->destUserID, tmpID, 8);
1836 memcpy(trans_hdr->destAppName, tmpName, 8);
1837 skb_push(skb, ETH_HLEN);
1838 memset(skb->data, 0, ETH_HLEN);
1839 }
1840
1841 /**
1842 * afiucv_hs_callback_syn - react on received SYN
1843 **/
afiucv_hs_callback_syn(struct sock * sk,struct sk_buff * skb)1844 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1845 {
1846 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb);
1847 struct sock *nsk;
1848 struct iucv_sock *iucv, *niucv;
1849 int err;
1850
1851 iucv = iucv_sk(sk);
1852 if (!iucv) {
1853 /* no sock - connection refused */
1854 afiucv_swap_src_dest(skb);
1855 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1856 err = dev_queue_xmit(skb);
1857 goto out;
1858 }
1859
1860 nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1861 bh_lock_sock(sk);
1862 if ((sk->sk_state != IUCV_LISTEN) ||
1863 sk_acceptq_is_full(sk) ||
1864 !nsk) {
1865 /* error on server socket - connection refused */
1866 afiucv_swap_src_dest(skb);
1867 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1868 err = dev_queue_xmit(skb);
1869 iucv_sock_kill(nsk);
1870 bh_unlock_sock(sk);
1871 goto out;
1872 }
1873
1874 niucv = iucv_sk(nsk);
1875 iucv_sock_init(nsk, sk);
1876 niucv->transport = AF_IUCV_TRANS_HIPER;
1877 niucv->msglimit = iucv->msglimit;
1878 if (!trans_hdr->window)
1879 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1880 else
1881 niucv->msglimit_peer = trans_hdr->window;
1882 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1883 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1884 memcpy(niucv->src_name, iucv->src_name, 8);
1885 memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1886 nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
1887 niucv->hs_dev = iucv->hs_dev;
1888 dev_hold(niucv->hs_dev);
1889 afiucv_swap_src_dest(skb);
1890 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
1891 trans_hdr->window = niucv->msglimit;
1892 /* if receiver acks the xmit connection is established */
1893 err = dev_queue_xmit(skb);
1894 if (!err) {
1895 iucv_accept_enqueue(sk, nsk);
1896 nsk->sk_state = IUCV_CONNECTED;
1897 sk->sk_data_ready(sk);
1898 } else
1899 iucv_sock_kill(nsk);
1900 bh_unlock_sock(sk);
1901
1902 out:
1903 return NET_RX_SUCCESS;
1904 }
1905
1906 /**
1907 * afiucv_hs_callback_synack() - react on received SYN-ACK
1908 **/
afiucv_hs_callback_synack(struct sock * sk,struct sk_buff * skb)1909 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
1910 {
1911 struct iucv_sock *iucv = iucv_sk(sk);
1912
1913 if (!iucv)
1914 goto out;
1915 if (sk->sk_state != IUCV_BOUND)
1916 goto out;
1917 bh_lock_sock(sk);
1918 iucv->msglimit_peer = iucv_trans_hdr(skb)->window;
1919 sk->sk_state = IUCV_CONNECTED;
1920 sk->sk_state_change(sk);
1921 bh_unlock_sock(sk);
1922 out:
1923 kfree_skb(skb);
1924 return NET_RX_SUCCESS;
1925 }
1926
1927 /**
1928 * afiucv_hs_callback_synfin() - react on received SYN_FIN
1929 **/
afiucv_hs_callback_synfin(struct sock * sk,struct sk_buff * skb)1930 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
1931 {
1932 struct iucv_sock *iucv = iucv_sk(sk);
1933
1934 if (!iucv)
1935 goto out;
1936 if (sk->sk_state != IUCV_BOUND)
1937 goto out;
1938 bh_lock_sock(sk);
1939 sk->sk_state = IUCV_DISCONN;
1940 sk->sk_state_change(sk);
1941 bh_unlock_sock(sk);
1942 out:
1943 kfree_skb(skb);
1944 return NET_RX_SUCCESS;
1945 }
1946
1947 /**
1948 * afiucv_hs_callback_fin() - react on received FIN
1949 **/
afiucv_hs_callback_fin(struct sock * sk,struct sk_buff * skb)1950 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
1951 {
1952 struct iucv_sock *iucv = iucv_sk(sk);
1953
1954 /* other end of connection closed */
1955 if (!iucv)
1956 goto out;
1957 bh_lock_sock(sk);
1958 if (sk->sk_state == IUCV_CONNECTED) {
1959 sk->sk_state = IUCV_DISCONN;
1960 sk->sk_state_change(sk);
1961 }
1962 bh_unlock_sock(sk);
1963 out:
1964 kfree_skb(skb);
1965 return NET_RX_SUCCESS;
1966 }
1967
1968 /**
1969 * afiucv_hs_callback_win() - react on received WIN
1970 **/
afiucv_hs_callback_win(struct sock * sk,struct sk_buff * skb)1971 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
1972 {
1973 struct iucv_sock *iucv = iucv_sk(sk);
1974
1975 if (!iucv)
1976 return NET_RX_SUCCESS;
1977
1978 if (sk->sk_state != IUCV_CONNECTED)
1979 return NET_RX_SUCCESS;
1980
1981 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent);
1982 iucv_sock_wake_msglim(sk);
1983 return NET_RX_SUCCESS;
1984 }
1985
1986 /**
1987 * afiucv_hs_callback_rx() - react on received data
1988 **/
afiucv_hs_callback_rx(struct sock * sk,struct sk_buff * skb)1989 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
1990 {
1991 struct iucv_sock *iucv = iucv_sk(sk);
1992
1993 if (!iucv) {
1994 kfree_skb(skb);
1995 return NET_RX_SUCCESS;
1996 }
1997
1998 if (sk->sk_state != IUCV_CONNECTED) {
1999 kfree_skb(skb);
2000 return NET_RX_SUCCESS;
2001 }
2002
2003 if (sk->sk_shutdown & RCV_SHUTDOWN) {
2004 kfree_skb(skb);
2005 return NET_RX_SUCCESS;
2006 }
2007
2008 /* write stuff from iucv_msg to skb cb */
2009 skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2010 skb_reset_transport_header(skb);
2011 skb_reset_network_header(skb);
2012 IUCV_SKB_CB(skb)->offset = 0;
2013 if (sk_filter(sk, skb)) {
2014 atomic_inc(&sk->sk_drops); /* skb rejected by filter */
2015 kfree_skb(skb);
2016 return NET_RX_SUCCESS;
2017 }
2018
2019 spin_lock(&iucv->message_q.lock);
2020 if (skb_queue_empty(&iucv->backlog_skb_q)) {
2021 if (__sock_queue_rcv_skb(sk, skb))
2022 /* handle rcv queue full */
2023 skb_queue_tail(&iucv->backlog_skb_q, skb);
2024 } else
2025 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2026 spin_unlock(&iucv->message_q.lock);
2027 return NET_RX_SUCCESS;
2028 }
2029
2030 /**
2031 * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2032 * transport
2033 * called from netif RX softirq
2034 **/
afiucv_hs_rcv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt,struct net_device * orig_dev)2035 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2036 struct packet_type *pt, struct net_device *orig_dev)
2037 {
2038 struct sock *sk;
2039 struct iucv_sock *iucv;
2040 struct af_iucv_trans_hdr *trans_hdr;
2041 int err = NET_RX_SUCCESS;
2042 char nullstring[8];
2043
2044 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) {
2045 kfree_skb(skb);
2046 return NET_RX_SUCCESS;
2047 }
2048
2049 trans_hdr = iucv_trans_hdr(skb);
2050 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2051 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2052 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2053 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2054 memset(nullstring, 0, sizeof(nullstring));
2055 iucv = NULL;
2056 sk = NULL;
2057 read_lock(&iucv_sk_list.lock);
2058 sk_for_each(sk, &iucv_sk_list.head) {
2059 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2060 if ((!memcmp(&iucv_sk(sk)->src_name,
2061 trans_hdr->destAppName, 8)) &&
2062 (!memcmp(&iucv_sk(sk)->src_user_id,
2063 trans_hdr->destUserID, 8)) &&
2064 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2065 (!memcmp(&iucv_sk(sk)->dst_user_id,
2066 nullstring, 8))) {
2067 iucv = iucv_sk(sk);
2068 break;
2069 }
2070 } else {
2071 if ((!memcmp(&iucv_sk(sk)->src_name,
2072 trans_hdr->destAppName, 8)) &&
2073 (!memcmp(&iucv_sk(sk)->src_user_id,
2074 trans_hdr->destUserID, 8)) &&
2075 (!memcmp(&iucv_sk(sk)->dst_name,
2076 trans_hdr->srcAppName, 8)) &&
2077 (!memcmp(&iucv_sk(sk)->dst_user_id,
2078 trans_hdr->srcUserID, 8))) {
2079 iucv = iucv_sk(sk);
2080 break;
2081 }
2082 }
2083 }
2084 read_unlock(&iucv_sk_list.lock);
2085 if (!iucv)
2086 sk = NULL;
2087
2088 /* no sock
2089 how should we send with no sock
2090 1) send without sock no send rc checking?
2091 2) introduce default sock to handle this cases
2092
2093 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2094 data -> send FIN
2095 SYN|ACK, SYN|FIN, FIN -> no action? */
2096
2097 switch (trans_hdr->flags) {
2098 case AF_IUCV_FLAG_SYN:
2099 /* connect request */
2100 err = afiucv_hs_callback_syn(sk, skb);
2101 break;
2102 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2103 /* connect request confirmed */
2104 err = afiucv_hs_callback_synack(sk, skb);
2105 break;
2106 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2107 /* connect request refused */
2108 err = afiucv_hs_callback_synfin(sk, skb);
2109 break;
2110 case (AF_IUCV_FLAG_FIN):
2111 /* close request */
2112 err = afiucv_hs_callback_fin(sk, skb);
2113 break;
2114 case (AF_IUCV_FLAG_WIN):
2115 err = afiucv_hs_callback_win(sk, skb);
2116 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2117 kfree_skb(skb);
2118 break;
2119 }
2120 fallthrough; /* and receive non-zero length data */
2121 case (AF_IUCV_FLAG_SHT):
2122 /* shutdown request */
2123 fallthrough; /* and receive zero length data */
2124 case 0:
2125 /* plain data frame */
2126 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2127 err = afiucv_hs_callback_rx(sk, skb);
2128 break;
2129 default:
2130 kfree_skb(skb);
2131 }
2132
2133 return err;
2134 }
2135
2136 /**
2137 * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets
2138 * transport
2139 **/
afiucv_hs_callback_txnotify(struct sock * sk,enum iucv_tx_notify n)2140 static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n)
2141 {
2142 struct iucv_sock *iucv = iucv_sk(sk);
2143
2144 if (sock_flag(sk, SOCK_ZAPPED))
2145 return;
2146
2147 switch (n) {
2148 case TX_NOTIFY_OK:
2149 atomic_dec(&iucv->skbs_in_xmit);
2150 iucv_sock_wake_msglim(sk);
2151 break;
2152 case TX_NOTIFY_PENDING:
2153 atomic_inc(&iucv->pendings);
2154 break;
2155 case TX_NOTIFY_DELAYED_OK:
2156 atomic_dec(&iucv->skbs_in_xmit);
2157 if (atomic_dec_return(&iucv->pendings) <= 0)
2158 iucv_sock_wake_msglim(sk);
2159 break;
2160 default:
2161 atomic_dec(&iucv->skbs_in_xmit);
2162 if (sk->sk_state == IUCV_CONNECTED) {
2163 sk->sk_state = IUCV_DISCONN;
2164 sk->sk_state_change(sk);
2165 }
2166 }
2167
2168 if (sk->sk_state == IUCV_CLOSING) {
2169 if (atomic_read(&iucv->skbs_in_xmit) == 0) {
2170 sk->sk_state = IUCV_CLOSED;
2171 sk->sk_state_change(sk);
2172 }
2173 }
2174 }
2175
2176 /*
2177 * afiucv_netdev_event: handle netdev notifier chain events
2178 */
afiucv_netdev_event(struct notifier_block * this,unsigned long event,void * ptr)2179 static int afiucv_netdev_event(struct notifier_block *this,
2180 unsigned long event, void *ptr)
2181 {
2182 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2183 struct sock *sk;
2184 struct iucv_sock *iucv;
2185
2186 switch (event) {
2187 case NETDEV_REBOOT:
2188 case NETDEV_GOING_DOWN:
2189 sk_for_each(sk, &iucv_sk_list.head) {
2190 iucv = iucv_sk(sk);
2191 if ((iucv->hs_dev == event_dev) &&
2192 (sk->sk_state == IUCV_CONNECTED)) {
2193 if (event == NETDEV_GOING_DOWN)
2194 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2195 sk->sk_state = IUCV_DISCONN;
2196 sk->sk_state_change(sk);
2197 }
2198 }
2199 break;
2200 case NETDEV_DOWN:
2201 case NETDEV_UNREGISTER:
2202 default:
2203 break;
2204 }
2205 return NOTIFY_DONE;
2206 }
2207
2208 static struct notifier_block afiucv_netdev_notifier = {
2209 .notifier_call = afiucv_netdev_event,
2210 };
2211
2212 static const struct proto_ops iucv_sock_ops = {
2213 .family = PF_IUCV,
2214 .owner = THIS_MODULE,
2215 .release = iucv_sock_release,
2216 .bind = iucv_sock_bind,
2217 .connect = iucv_sock_connect,
2218 .listen = iucv_sock_listen,
2219 .accept = iucv_sock_accept,
2220 .getname = iucv_sock_getname,
2221 .sendmsg = iucv_sock_sendmsg,
2222 .recvmsg = iucv_sock_recvmsg,
2223 .poll = iucv_sock_poll,
2224 .ioctl = sock_no_ioctl,
2225 .mmap = sock_no_mmap,
2226 .socketpair = sock_no_socketpair,
2227 .shutdown = iucv_sock_shutdown,
2228 .setsockopt = iucv_sock_setsockopt,
2229 .getsockopt = iucv_sock_getsockopt,
2230 };
2231
iucv_sock_create(struct net * net,struct socket * sock,int protocol,int kern)2232 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
2233 int kern)
2234 {
2235 struct sock *sk;
2236
2237 if (protocol && protocol != PF_IUCV)
2238 return -EPROTONOSUPPORT;
2239
2240 sock->state = SS_UNCONNECTED;
2241
2242 switch (sock->type) {
2243 case SOCK_STREAM:
2244 case SOCK_SEQPACKET:
2245 /* currently, proto ops can handle both sk types */
2246 sock->ops = &iucv_sock_ops;
2247 break;
2248 default:
2249 return -ESOCKTNOSUPPORT;
2250 }
2251
2252 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
2253 if (!sk)
2254 return -ENOMEM;
2255
2256 iucv_sock_init(sk, NULL);
2257
2258 return 0;
2259 }
2260
2261 static const struct net_proto_family iucv_sock_family_ops = {
2262 .family = AF_IUCV,
2263 .owner = THIS_MODULE,
2264 .create = iucv_sock_create,
2265 };
2266
2267 static struct packet_type iucv_packet_type = {
2268 .type = cpu_to_be16(ETH_P_AF_IUCV),
2269 .func = afiucv_hs_rcv,
2270 };
2271
afiucv_iucv_init(void)2272 static int afiucv_iucv_init(void)
2273 {
2274 return pr_iucv->iucv_register(&af_iucv_handler, 0);
2275 }
2276
afiucv_iucv_exit(void)2277 static void afiucv_iucv_exit(void)
2278 {
2279 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2280 }
2281
afiucv_init(void)2282 static int __init afiucv_init(void)
2283 {
2284 int err;
2285
2286 if (MACHINE_IS_VM) {
2287 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2288 if (unlikely(err)) {
2289 WARN_ON(err);
2290 err = -EPROTONOSUPPORT;
2291 goto out;
2292 }
2293
2294 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2295 if (!pr_iucv) {
2296 printk(KERN_WARNING "iucv_if lookup failed\n");
2297 memset(&iucv_userid, 0, sizeof(iucv_userid));
2298 }
2299 } else {
2300 memset(&iucv_userid, 0, sizeof(iucv_userid));
2301 pr_iucv = NULL;
2302 }
2303
2304 err = proto_register(&iucv_proto, 0);
2305 if (err)
2306 goto out;
2307 err = sock_register(&iucv_sock_family_ops);
2308 if (err)
2309 goto out_proto;
2310
2311 if (pr_iucv) {
2312 err = afiucv_iucv_init();
2313 if (err)
2314 goto out_sock;
2315 }
2316
2317 err = register_netdevice_notifier(&afiucv_netdev_notifier);
2318 if (err)
2319 goto out_notifier;
2320
2321 dev_add_pack(&iucv_packet_type);
2322 return 0;
2323
2324 out_notifier:
2325 if (pr_iucv)
2326 afiucv_iucv_exit();
2327 out_sock:
2328 sock_unregister(PF_IUCV);
2329 out_proto:
2330 proto_unregister(&iucv_proto);
2331 out:
2332 if (pr_iucv)
2333 symbol_put(iucv_if);
2334 return err;
2335 }
2336
afiucv_exit(void)2337 static void __exit afiucv_exit(void)
2338 {
2339 if (pr_iucv) {
2340 afiucv_iucv_exit();
2341 symbol_put(iucv_if);
2342 }
2343
2344 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2345 dev_remove_pack(&iucv_packet_type);
2346 sock_unregister(PF_IUCV);
2347 proto_unregister(&iucv_proto);
2348 }
2349
2350 module_init(afiucv_init);
2351 module_exit(afiucv_exit);
2352
2353 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2354 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2355 MODULE_VERSION(VERSION);
2356 MODULE_LICENSE("GPL");
2357 MODULE_ALIAS_NETPROTO(PF_IUCV);
2358