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TOMOYO Linux Cross Reference
Linux/net/iucv/af_iucv.c

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  1 /*
  2  *  IUCV protocol stack for Linux on zSeries
  3  *
  4  *  Copyright IBM Corp. 2006, 2009
  5  *
  6  *  Author(s):  Jennifer Hunt <jenhunt@us.ibm.com>
  7  *              Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
  8  *  PM functions:
  9  *              Ursula Braun <ursula.braun@de.ibm.com>
 10  */
 11 
 12 #define KMSG_COMPONENT "af_iucv"
 13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 14 
 15 #include <linux/module.h>
 16 #include <linux/types.h>
 17 #include <linux/list.h>
 18 #include <linux/errno.h>
 19 #include <linux/kernel.h>
 20 #include <linux/sched/signal.h>
 21 #include <linux/slab.h>
 22 #include <linux/skbuff.h>
 23 #include <linux/init.h>
 24 #include <linux/poll.h>
 25 #include <linux/security.h>
 26 #include <net/sock.h>
 27 #include <asm/ebcdic.h>
 28 #include <asm/cpcmd.h>
 29 #include <linux/kmod.h>
 30 
 31 #include <net/iucv/af_iucv.h>
 32 
 33 #define VERSION "1.2"
 34 
 35 static char iucv_userid[80];
 36 
 37 static const struct proto_ops iucv_sock_ops;
 38 
 39 static struct proto iucv_proto = {
 40         .name           = "AF_IUCV",
 41         .owner          = THIS_MODULE,
 42         .obj_size       = sizeof(struct iucv_sock),
 43 };
 44 
 45 static struct iucv_interface *pr_iucv;
 46 
 47 /* special AF_IUCV IPRM messages */
 48 static const u8 iprm_shutdown[8] =
 49         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
 50 
 51 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
 52 
 53 #define __iucv_sock_wait(sk, condition, timeo, ret)                     \
 54 do {                                                                    \
 55         DEFINE_WAIT(__wait);                                            \
 56         long __timeo = timeo;                                           \
 57         ret = 0;                                                        \
 58         prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);     \
 59         while (!(condition)) {                                          \
 60                 if (!__timeo) {                                         \
 61                         ret = -EAGAIN;                                  \
 62                         break;                                          \
 63                 }                                                       \
 64                 if (signal_pending(current)) {                          \
 65                         ret = sock_intr_errno(__timeo);                 \
 66                         break;                                          \
 67                 }                                                       \
 68                 release_sock(sk);                                       \
 69                 __timeo = schedule_timeout(__timeo);                    \
 70                 lock_sock(sk);                                          \
 71                 ret = sock_error(sk);                                   \
 72                 if (ret)                                                \
 73                         break;                                          \
 74         }                                                               \
 75         finish_wait(sk_sleep(sk), &__wait);                             \
 76 } while (0)
 77 
 78 #define iucv_sock_wait(sk, condition, timeo)                            \
 79 ({                                                                      \
 80         int __ret = 0;                                                  \
 81         if (!(condition))                                               \
 82                 __iucv_sock_wait(sk, condition, timeo, __ret);          \
 83         __ret;                                                          \
 84 })
 85 
 86 static void iucv_sock_kill(struct sock *sk);
 87 static void iucv_sock_close(struct sock *sk);
 88 static void iucv_sever_path(struct sock *, int);
 89 
 90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
 91         struct packet_type *pt, struct net_device *orig_dev);
 92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
 93                    struct sk_buff *skb, u8 flags);
 94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
 95 
 96 /* Call Back functions */
 97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
 98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
 99 static void iucv_callback_connack(struct iucv_path *, u8 *);
100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
103 
104 static struct iucv_sock_list iucv_sk_list = {
105         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
106         .autobind_name = ATOMIC_INIT(0)
107 };
108 
109 static struct iucv_handler af_iucv_handler = {
110         .path_pending     = iucv_callback_connreq,
111         .path_complete    = iucv_callback_connack,
112         .path_severed     = iucv_callback_connrej,
113         .message_pending  = iucv_callback_rx,
114         .message_complete = iucv_callback_txdone,
115         .path_quiesced    = iucv_callback_shutdown,
116 };
117 
118 static inline void high_nmcpy(unsigned char *dst, char *src)
119 {
120        memcpy(dst, src, 8);
121 }
122 
123 static inline void low_nmcpy(unsigned char *dst, char *src)
124 {
125        memcpy(&dst[8], src, 8);
126 }
127 
128 static int afiucv_pm_prepare(struct device *dev)
129 {
130 #ifdef CONFIG_PM_DEBUG
131         printk(KERN_WARNING "afiucv_pm_prepare\n");
132 #endif
133         return 0;
134 }
135 
136 static void afiucv_pm_complete(struct device *dev)
137 {
138 #ifdef CONFIG_PM_DEBUG
139         printk(KERN_WARNING "afiucv_pm_complete\n");
140 #endif
141 }
142 
143 /**
144  * afiucv_pm_freeze() - Freeze PM callback
145  * @dev:        AFIUCV dummy device
146  *
147  * Sever all established IUCV communication pathes
148  */
149 static int afiucv_pm_freeze(struct device *dev)
150 {
151         struct iucv_sock *iucv;
152         struct sock *sk;
153         int err = 0;
154 
155 #ifdef CONFIG_PM_DEBUG
156         printk(KERN_WARNING "afiucv_pm_freeze\n");
157 #endif
158         read_lock(&iucv_sk_list.lock);
159         sk_for_each(sk, &iucv_sk_list.head) {
160                 iucv = iucv_sk(sk);
161                 switch (sk->sk_state) {
162                 case IUCV_DISCONN:
163                 case IUCV_CLOSING:
164                 case IUCV_CONNECTED:
165                         iucv_sever_path(sk, 0);
166                         break;
167                 case IUCV_OPEN:
168                 case IUCV_BOUND:
169                 case IUCV_LISTEN:
170                 case IUCV_CLOSED:
171                 default:
172                         break;
173                 }
174                 skb_queue_purge(&iucv->send_skb_q);
175                 skb_queue_purge(&iucv->backlog_skb_q);
176         }
177         read_unlock(&iucv_sk_list.lock);
178         return err;
179 }
180 
181 /**
182  * afiucv_pm_restore_thaw() - Thaw and restore PM callback
183  * @dev:        AFIUCV dummy device
184  *
185  * socket clean up after freeze
186  */
187 static int afiucv_pm_restore_thaw(struct device *dev)
188 {
189         struct sock *sk;
190 
191 #ifdef CONFIG_PM_DEBUG
192         printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
193 #endif
194         read_lock(&iucv_sk_list.lock);
195         sk_for_each(sk, &iucv_sk_list.head) {
196                 switch (sk->sk_state) {
197                 case IUCV_CONNECTED:
198                         sk->sk_err = EPIPE;
199                         sk->sk_state = IUCV_DISCONN;
200                         sk->sk_state_change(sk);
201                         break;
202                 case IUCV_DISCONN:
203                 case IUCV_CLOSING:
204                 case IUCV_LISTEN:
205                 case IUCV_BOUND:
206                 case IUCV_OPEN:
207                 default:
208                         break;
209                 }
210         }
211         read_unlock(&iucv_sk_list.lock);
212         return 0;
213 }
214 
215 static const struct dev_pm_ops afiucv_pm_ops = {
216         .prepare = afiucv_pm_prepare,
217         .complete = afiucv_pm_complete,
218         .freeze = afiucv_pm_freeze,
219         .thaw = afiucv_pm_restore_thaw,
220         .restore = afiucv_pm_restore_thaw,
221 };
222 
223 static struct device_driver af_iucv_driver = {
224         .owner = THIS_MODULE,
225         .name = "afiucv",
226         .bus  = NULL,
227         .pm   = &afiucv_pm_ops,
228 };
229 
230 /* dummy device used as trigger for PM functions */
231 static struct device *af_iucv_dev;
232 
233 /**
234  * iucv_msg_length() - Returns the length of an iucv message.
235  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
236  *
237  * The function returns the length of the specified iucv message @msg of data
238  * stored in a buffer and of data stored in the parameter list (PRMDATA).
239  *
240  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
241  * data:
242  *      PRMDATA[0..6]   socket data (max 7 bytes);
243  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
244  *
245  * The socket data length is computed by subtracting the socket data length
246  * value from 0xFF.
247  * If the socket data len is greater 7, then PRMDATA can be used for special
248  * notifications (see iucv_sock_shutdown); and further,
249  * if the socket data len is > 7, the function returns 8.
250  *
251  * Use this function to allocate socket buffers to store iucv message data.
252  */
253 static inline size_t iucv_msg_length(struct iucv_message *msg)
254 {
255         size_t datalen;
256 
257         if (msg->flags & IUCV_IPRMDATA) {
258                 datalen = 0xff - msg->rmmsg[7];
259                 return (datalen < 8) ? datalen : 8;
260         }
261         return msg->length;
262 }
263 
264 /**
265  * iucv_sock_in_state() - check for specific states
266  * @sk:         sock structure
267  * @state:      first iucv sk state
268  * @state:      second iucv sk state
269  *
270  * Returns true if the socket in either in the first or second state.
271  */
272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
273 {
274         return (sk->sk_state == state || sk->sk_state == state2);
275 }
276 
277 /**
278  * iucv_below_msglim() - function to check if messages can be sent
279  * @sk:         sock structure
280  *
281  * Returns true if the send queue length is lower than the message limit.
282  * Always returns true if the socket is not connected (no iucv path for
283  * checking the message limit).
284  */
285 static inline int iucv_below_msglim(struct sock *sk)
286 {
287         struct iucv_sock *iucv = iucv_sk(sk);
288 
289         if (sk->sk_state != IUCV_CONNECTED)
290                 return 1;
291         if (iucv->transport == AF_IUCV_TRANS_IUCV)
292                 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
293         else
294                 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
295                         (atomic_read(&iucv->pendings) <= 0));
296 }
297 
298 /**
299  * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
300  */
301 static void iucv_sock_wake_msglim(struct sock *sk)
302 {
303         struct socket_wq *wq;
304 
305         rcu_read_lock();
306         wq = rcu_dereference(sk->sk_wq);
307         if (skwq_has_sleeper(wq))
308                 wake_up_interruptible_all(&wq->wait);
309         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
310         rcu_read_unlock();
311 }
312 
313 /**
314  * afiucv_hs_send() - send a message through HiperSockets transport
315  */
316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
317                    struct sk_buff *skb, u8 flags)
318 {
319         struct iucv_sock *iucv = iucv_sk(sock);
320         struct af_iucv_trans_hdr *phs_hdr;
321         struct sk_buff *nskb;
322         int err, confirm_recv = 0;
323 
324         memset(skb->head, 0, ETH_HLEN);
325         phs_hdr = skb_push(skb, sizeof(struct af_iucv_trans_hdr));
326         skb_reset_mac_header(skb);
327         skb_reset_network_header(skb);
328         skb_push(skb, ETH_HLEN);
329         skb_reset_mac_header(skb);
330         memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
331 
332         phs_hdr->magic = ETH_P_AF_IUCV;
333         phs_hdr->version = 1;
334         phs_hdr->flags = flags;
335         if (flags == AF_IUCV_FLAG_SYN)
336                 phs_hdr->window = iucv->msglimit;
337         else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
338                 confirm_recv = atomic_read(&iucv->msg_recv);
339                 phs_hdr->window = confirm_recv;
340                 if (confirm_recv)
341                         phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
342         }
343         memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
344         memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
345         memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
346         memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
347         ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
348         ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
349         ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
350         ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
351         if (imsg)
352                 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
353 
354         skb->dev = iucv->hs_dev;
355         if (!skb->dev)
356                 return -ENODEV;
357         if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
358                 return -ENETDOWN;
359         if (skb->len > skb->dev->mtu) {
360                 if (sock->sk_type == SOCK_SEQPACKET)
361                         return -EMSGSIZE;
362                 else
363                         skb_trim(skb, skb->dev->mtu);
364         }
365         skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
366         nskb = skb_clone(skb, GFP_ATOMIC);
367         if (!nskb)
368                 return -ENOMEM;
369         skb_queue_tail(&iucv->send_skb_q, nskb);
370         err = dev_queue_xmit(skb);
371         if (net_xmit_eval(err)) {
372                 skb_unlink(nskb, &iucv->send_skb_q);
373                 kfree_skb(nskb);
374         } else {
375                 atomic_sub(confirm_recv, &iucv->msg_recv);
376                 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
377         }
378         return net_xmit_eval(err);
379 }
380 
381 static struct sock *__iucv_get_sock_by_name(char *nm)
382 {
383         struct sock *sk;
384 
385         sk_for_each(sk, &iucv_sk_list.head)
386                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
387                         return sk;
388 
389         return NULL;
390 }
391 
392 static void iucv_sock_destruct(struct sock *sk)
393 {
394         skb_queue_purge(&sk->sk_receive_queue);
395         skb_queue_purge(&sk->sk_error_queue);
396 
397         sk_mem_reclaim(sk);
398 
399         if (!sock_flag(sk, SOCK_DEAD)) {
400                 pr_err("Attempt to release alive iucv socket %p\n", sk);
401                 return;
402         }
403 
404         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
405         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
406         WARN_ON(sk->sk_wmem_queued);
407         WARN_ON(sk->sk_forward_alloc);
408 }
409 
410 /* Cleanup Listen */
411 static void iucv_sock_cleanup_listen(struct sock *parent)
412 {
413         struct sock *sk;
414 
415         /* Close non-accepted connections */
416         while ((sk = iucv_accept_dequeue(parent, NULL))) {
417                 iucv_sock_close(sk);
418                 iucv_sock_kill(sk);
419         }
420 
421         parent->sk_state = IUCV_CLOSED;
422 }
423 
424 /* Kill socket (only if zapped and orphaned) */
425 static void iucv_sock_kill(struct sock *sk)
426 {
427         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
428                 return;
429 
430         iucv_sock_unlink(&iucv_sk_list, sk);
431         sock_set_flag(sk, SOCK_DEAD);
432         sock_put(sk);
433 }
434 
435 /* Terminate an IUCV path */
436 static void iucv_sever_path(struct sock *sk, int with_user_data)
437 {
438         unsigned char user_data[16];
439         struct iucv_sock *iucv = iucv_sk(sk);
440         struct iucv_path *path = iucv->path;
441 
442         if (iucv->path) {
443                 iucv->path = NULL;
444                 if (with_user_data) {
445                         low_nmcpy(user_data, iucv->src_name);
446                         high_nmcpy(user_data, iucv->dst_name);
447                         ASCEBC(user_data, sizeof(user_data));
448                         pr_iucv->path_sever(path, user_data);
449                 } else
450                         pr_iucv->path_sever(path, NULL);
451                 iucv_path_free(path);
452         }
453 }
454 
455 /* Send controlling flags through an IUCV socket for HIPER transport */
456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
457 {
458         int err = 0;
459         int blen;
460         struct sk_buff *skb;
461         u8 shutdown = 0;
462 
463         blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
464         if (sk->sk_shutdown & SEND_SHUTDOWN) {
465                 /* controlling flags should be sent anyway */
466                 shutdown = sk->sk_shutdown;
467                 sk->sk_shutdown &= RCV_SHUTDOWN;
468         }
469         skb = sock_alloc_send_skb(sk, blen, 1, &err);
470         if (skb) {
471                 skb_reserve(skb, blen);
472                 err = afiucv_hs_send(NULL, sk, skb, flags);
473         }
474         if (shutdown)
475                 sk->sk_shutdown = shutdown;
476         return err;
477 }
478 
479 /* Close an IUCV socket */
480 static void iucv_sock_close(struct sock *sk)
481 {
482         struct iucv_sock *iucv = iucv_sk(sk);
483         unsigned long timeo;
484         int err = 0;
485 
486         lock_sock(sk);
487 
488         switch (sk->sk_state) {
489         case IUCV_LISTEN:
490                 iucv_sock_cleanup_listen(sk);
491                 break;
492 
493         case IUCV_CONNECTED:
494                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
495                         err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
496                         sk->sk_state = IUCV_DISCONN;
497                         sk->sk_state_change(sk);
498                 }
499         case IUCV_DISCONN:   /* fall through */
500                 sk->sk_state = IUCV_CLOSING;
501                 sk->sk_state_change(sk);
502 
503                 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
504                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
505                                 timeo = sk->sk_lingertime;
506                         else
507                                 timeo = IUCV_DISCONN_TIMEOUT;
508                         iucv_sock_wait(sk,
509                                         iucv_sock_in_state(sk, IUCV_CLOSED, 0),
510                                         timeo);
511                 }
512 
513         case IUCV_CLOSING:   /* fall through */
514                 sk->sk_state = IUCV_CLOSED;
515                 sk->sk_state_change(sk);
516 
517                 sk->sk_err = ECONNRESET;
518                 sk->sk_state_change(sk);
519 
520                 skb_queue_purge(&iucv->send_skb_q);
521                 skb_queue_purge(&iucv->backlog_skb_q);
522 
523         default:   /* fall through */
524                 iucv_sever_path(sk, 1);
525         }
526 
527         if (iucv->hs_dev) {
528                 dev_put(iucv->hs_dev);
529                 iucv->hs_dev = NULL;
530                 sk->sk_bound_dev_if = 0;
531         }
532 
533         /* mark socket for deletion by iucv_sock_kill() */
534         sock_set_flag(sk, SOCK_ZAPPED);
535 
536         release_sock(sk);
537 }
538 
539 static void iucv_sock_init(struct sock *sk, struct sock *parent)
540 {
541         if (parent) {
542                 sk->sk_type = parent->sk_type;
543                 security_sk_clone(parent, sk);
544         }
545 }
546 
547 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
548 {
549         struct sock *sk;
550         struct iucv_sock *iucv;
551 
552         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
553         if (!sk)
554                 return NULL;
555         iucv = iucv_sk(sk);
556 
557         sock_init_data(sock, sk);
558         INIT_LIST_HEAD(&iucv->accept_q);
559         spin_lock_init(&iucv->accept_q_lock);
560         skb_queue_head_init(&iucv->send_skb_q);
561         INIT_LIST_HEAD(&iucv->message_q.list);
562         spin_lock_init(&iucv->message_q.lock);
563         skb_queue_head_init(&iucv->backlog_skb_q);
564         iucv->send_tag = 0;
565         atomic_set(&iucv->pendings, 0);
566         iucv->flags = 0;
567         iucv->msglimit = 0;
568         atomic_set(&iucv->msg_sent, 0);
569         atomic_set(&iucv->msg_recv, 0);
570         iucv->path = NULL;
571         iucv->sk_txnotify = afiucv_hs_callback_txnotify;
572         memset(&iucv->src_user_id , 0, 32);
573         if (pr_iucv)
574                 iucv->transport = AF_IUCV_TRANS_IUCV;
575         else
576                 iucv->transport = AF_IUCV_TRANS_HIPER;
577 
578         sk->sk_destruct = iucv_sock_destruct;
579         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
580         sk->sk_allocation = GFP_DMA;
581 
582         sock_reset_flag(sk, SOCK_ZAPPED);
583 
584         sk->sk_protocol = proto;
585         sk->sk_state    = IUCV_OPEN;
586 
587         iucv_sock_link(&iucv_sk_list, sk);
588         return sk;
589 }
590 
591 /* Create an IUCV socket */
592 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
593                             int kern)
594 {
595         struct sock *sk;
596 
597         if (protocol && protocol != PF_IUCV)
598                 return -EPROTONOSUPPORT;
599 
600         sock->state = SS_UNCONNECTED;
601 
602         switch (sock->type) {
603         case SOCK_STREAM:
604                 sock->ops = &iucv_sock_ops;
605                 break;
606         case SOCK_SEQPACKET:
607                 /* currently, proto ops can handle both sk types */
608                 sock->ops = &iucv_sock_ops;
609                 break;
610         default:
611                 return -ESOCKTNOSUPPORT;
612         }
613 
614         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
615         if (!sk)
616                 return -ENOMEM;
617 
618         iucv_sock_init(sk, NULL);
619 
620         return 0;
621 }
622 
623 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
624 {
625         write_lock_bh(&l->lock);
626         sk_add_node(sk, &l->head);
627         write_unlock_bh(&l->lock);
628 }
629 
630 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
631 {
632         write_lock_bh(&l->lock);
633         sk_del_node_init(sk);
634         write_unlock_bh(&l->lock);
635 }
636 
637 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
638 {
639         unsigned long flags;
640         struct iucv_sock *par = iucv_sk(parent);
641 
642         sock_hold(sk);
643         spin_lock_irqsave(&par->accept_q_lock, flags);
644         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
645         spin_unlock_irqrestore(&par->accept_q_lock, flags);
646         iucv_sk(sk)->parent = parent;
647         sk_acceptq_added(parent);
648 }
649 
650 void iucv_accept_unlink(struct sock *sk)
651 {
652         unsigned long flags;
653         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
654 
655         spin_lock_irqsave(&par->accept_q_lock, flags);
656         list_del_init(&iucv_sk(sk)->accept_q);
657         spin_unlock_irqrestore(&par->accept_q_lock, flags);
658         sk_acceptq_removed(iucv_sk(sk)->parent);
659         iucv_sk(sk)->parent = NULL;
660         sock_put(sk);
661 }
662 
663 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
664 {
665         struct iucv_sock *isk, *n;
666         struct sock *sk;
667 
668         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
669                 sk = (struct sock *) isk;
670                 lock_sock(sk);
671 
672                 if (sk->sk_state == IUCV_CLOSED) {
673                         iucv_accept_unlink(sk);
674                         release_sock(sk);
675                         continue;
676                 }
677 
678                 if (sk->sk_state == IUCV_CONNECTED ||
679                     sk->sk_state == IUCV_DISCONN ||
680                     !newsock) {
681                         iucv_accept_unlink(sk);
682                         if (newsock)
683                                 sock_graft(sk, newsock);
684 
685                         release_sock(sk);
686                         return sk;
687                 }
688 
689                 release_sock(sk);
690         }
691         return NULL;
692 }
693 
694 static void __iucv_auto_name(struct iucv_sock *iucv)
695 {
696         char name[12];
697 
698         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
699         while (__iucv_get_sock_by_name(name)) {
700                 sprintf(name, "%08x",
701                         atomic_inc_return(&iucv_sk_list.autobind_name));
702         }
703         memcpy(iucv->src_name, name, 8);
704 }
705 
706 /* Bind an unbound socket */
707 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
708                           int addr_len)
709 {
710         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
711         struct sock *sk = sock->sk;
712         struct iucv_sock *iucv;
713         int err = 0;
714         struct net_device *dev;
715         char uid[9];
716 
717         /* Verify the input sockaddr */
718         if (addr_len < sizeof(struct sockaddr_iucv) ||
719             addr->sa_family != AF_IUCV)
720                 return -EINVAL;
721 
722         lock_sock(sk);
723         if (sk->sk_state != IUCV_OPEN) {
724                 err = -EBADFD;
725                 goto done;
726         }
727 
728         write_lock_bh(&iucv_sk_list.lock);
729 
730         iucv = iucv_sk(sk);
731         if (__iucv_get_sock_by_name(sa->siucv_name)) {
732                 err = -EADDRINUSE;
733                 goto done_unlock;
734         }
735         if (iucv->path)
736                 goto done_unlock;
737 
738         /* Bind the socket */
739         if (pr_iucv)
740                 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
741                         goto vm_bind; /* VM IUCV transport */
742 
743         /* try hiper transport */
744         memcpy(uid, sa->siucv_user_id, sizeof(uid));
745         ASCEBC(uid, 8);
746         rcu_read_lock();
747         for_each_netdev_rcu(&init_net, dev) {
748                 if (!memcmp(dev->perm_addr, uid, 8)) {
749                         memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
750                         /* Check for unitialized siucv_name */
751                         if (strncmp(sa->siucv_name, "        ", 8) == 0)
752                                 __iucv_auto_name(iucv);
753                         else
754                                 memcpy(iucv->src_name, sa->siucv_name, 8);
755                         sk->sk_bound_dev_if = dev->ifindex;
756                         iucv->hs_dev = dev;
757                         dev_hold(dev);
758                         sk->sk_state = IUCV_BOUND;
759                         iucv->transport = AF_IUCV_TRANS_HIPER;
760                         if (!iucv->msglimit)
761                                 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
762                         rcu_read_unlock();
763                         goto done_unlock;
764                 }
765         }
766         rcu_read_unlock();
767 vm_bind:
768         if (pr_iucv) {
769                 /* use local userid for backward compat */
770                 memcpy(iucv->src_name, sa->siucv_name, 8);
771                 memcpy(iucv->src_user_id, iucv_userid, 8);
772                 sk->sk_state = IUCV_BOUND;
773                 iucv->transport = AF_IUCV_TRANS_IUCV;
774                 if (!iucv->msglimit)
775                         iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
776                 goto done_unlock;
777         }
778         /* found no dev to bind */
779         err = -ENODEV;
780 done_unlock:
781         /* Release the socket list lock */
782         write_unlock_bh(&iucv_sk_list.lock);
783 done:
784         release_sock(sk);
785         return err;
786 }
787 
788 /* Automatically bind an unbound socket */
789 static int iucv_sock_autobind(struct sock *sk)
790 {
791         struct iucv_sock *iucv = iucv_sk(sk);
792         int err = 0;
793 
794         if (unlikely(!pr_iucv))
795                 return -EPROTO;
796 
797         memcpy(iucv->src_user_id, iucv_userid, 8);
798 
799         write_lock_bh(&iucv_sk_list.lock);
800         __iucv_auto_name(iucv);
801         write_unlock_bh(&iucv_sk_list.lock);
802 
803         if (!iucv->msglimit)
804                 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
805 
806         return err;
807 }
808 
809 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
810 {
811         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
812         struct sock *sk = sock->sk;
813         struct iucv_sock *iucv = iucv_sk(sk);
814         unsigned char user_data[16];
815         int err;
816 
817         high_nmcpy(user_data, sa->siucv_name);
818         low_nmcpy(user_data, iucv->src_name);
819         ASCEBC(user_data, sizeof(user_data));
820 
821         /* Create path. */
822         iucv->path = iucv_path_alloc(iucv->msglimit,
823                                      IUCV_IPRMDATA, GFP_KERNEL);
824         if (!iucv->path) {
825                 err = -ENOMEM;
826                 goto done;
827         }
828         err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
829                                     sa->siucv_user_id, NULL, user_data,
830                                     sk);
831         if (err) {
832                 iucv_path_free(iucv->path);
833                 iucv->path = NULL;
834                 switch (err) {
835                 case 0x0b:      /* Target communicator is not logged on */
836                         err = -ENETUNREACH;
837                         break;
838                 case 0x0d:      /* Max connections for this guest exceeded */
839                 case 0x0e:      /* Max connections for target guest exceeded */
840                         err = -EAGAIN;
841                         break;
842                 case 0x0f:      /* Missing IUCV authorization */
843                         err = -EACCES;
844                         break;
845                 default:
846                         err = -ECONNREFUSED;
847                         break;
848                 }
849         }
850 done:
851         return err;
852 }
853 
854 /* Connect an unconnected socket */
855 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
856                              int alen, int flags)
857 {
858         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
859         struct sock *sk = sock->sk;
860         struct iucv_sock *iucv = iucv_sk(sk);
861         int err;
862 
863         if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
864                 return -EINVAL;
865 
866         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
867                 return -EBADFD;
868 
869         if (sk->sk_state == IUCV_OPEN &&
870             iucv->transport == AF_IUCV_TRANS_HIPER)
871                 return -EBADFD; /* explicit bind required */
872 
873         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
874                 return -EINVAL;
875 
876         if (sk->sk_state == IUCV_OPEN) {
877                 err = iucv_sock_autobind(sk);
878                 if (unlikely(err))
879                         return err;
880         }
881 
882         lock_sock(sk);
883 
884         /* Set the destination information */
885         memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
886         memcpy(iucv->dst_name, sa->siucv_name, 8);
887 
888         if (iucv->transport == AF_IUCV_TRANS_HIPER)
889                 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
890         else
891                 err = afiucv_path_connect(sock, addr);
892         if (err)
893                 goto done;
894 
895         if (sk->sk_state != IUCV_CONNECTED)
896                 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
897                                                             IUCV_DISCONN),
898                                      sock_sndtimeo(sk, flags & O_NONBLOCK));
899 
900         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
901                 err = -ECONNREFUSED;
902 
903         if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
904                 iucv_sever_path(sk, 0);
905 
906 done:
907         release_sock(sk);
908         return err;
909 }
910 
911 /* Move a socket into listening state. */
912 static int iucv_sock_listen(struct socket *sock, int backlog)
913 {
914         struct sock *sk = sock->sk;
915         int err;
916 
917         lock_sock(sk);
918 
919         err = -EINVAL;
920         if (sk->sk_state != IUCV_BOUND)
921                 goto done;
922 
923         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
924                 goto done;
925 
926         sk->sk_max_ack_backlog = backlog;
927         sk->sk_ack_backlog = 0;
928         sk->sk_state = IUCV_LISTEN;
929         err = 0;
930 
931 done:
932         release_sock(sk);
933         return err;
934 }
935 
936 /* Accept a pending connection */
937 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
938                             int flags, bool kern)
939 {
940         DECLARE_WAITQUEUE(wait, current);
941         struct sock *sk = sock->sk, *nsk;
942         long timeo;
943         int err = 0;
944 
945         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
946 
947         if (sk->sk_state != IUCV_LISTEN) {
948                 err = -EBADFD;
949                 goto done;
950         }
951 
952         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
953 
954         /* Wait for an incoming connection */
955         add_wait_queue_exclusive(sk_sleep(sk), &wait);
956         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
957                 set_current_state(TASK_INTERRUPTIBLE);
958                 if (!timeo) {
959                         err = -EAGAIN;
960                         break;
961                 }
962 
963                 release_sock(sk);
964                 timeo = schedule_timeout(timeo);
965                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
966 
967                 if (sk->sk_state != IUCV_LISTEN) {
968                         err = -EBADFD;
969                         break;
970                 }
971 
972                 if (signal_pending(current)) {
973                         err = sock_intr_errno(timeo);
974                         break;
975                 }
976         }
977 
978         set_current_state(TASK_RUNNING);
979         remove_wait_queue(sk_sleep(sk), &wait);
980 
981         if (err)
982                 goto done;
983 
984         newsock->state = SS_CONNECTED;
985 
986 done:
987         release_sock(sk);
988         return err;
989 }
990 
991 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
992                              int peer)
993 {
994         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
995         struct sock *sk = sock->sk;
996         struct iucv_sock *iucv = iucv_sk(sk);
997 
998         addr->sa_family = AF_IUCV;
999 
1000         if (peer) {
1001                 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1002                 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1003         } else {
1004                 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1005                 memcpy(siucv->siucv_name, iucv->src_name, 8);
1006         }
1007         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1008         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1009         memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1010 
1011         return sizeof(struct sockaddr_iucv);
1012 }
1013 
1014 /**
1015  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1016  * @path:       IUCV path
1017  * @msg:        Pointer to a struct iucv_message
1018  * @skb:        The socket data to send, skb->len MUST BE <= 7
1019  *
1020  * Send the socket data in the parameter list in the iucv message
1021  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1022  * list and the socket data len at index 7 (last byte).
1023  * See also iucv_msg_length().
1024  *
1025  * Returns the error code from the iucv_message_send() call.
1026  */
1027 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1028                           struct sk_buff *skb)
1029 {
1030         u8 prmdata[8];
1031 
1032         memcpy(prmdata, (void *) skb->data, skb->len);
1033         prmdata[7] = 0xff - (u8) skb->len;
1034         return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1035                                  (void *) prmdata, 8);
1036 }
1037 
1038 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1039                              size_t len)
1040 {
1041         struct sock *sk = sock->sk;
1042         struct iucv_sock *iucv = iucv_sk(sk);
1043         size_t headroom = 0;
1044         size_t linear;
1045         struct sk_buff *skb;
1046         struct iucv_message txmsg = {0};
1047         struct cmsghdr *cmsg;
1048         int cmsg_done;
1049         long timeo;
1050         char user_id[9];
1051         char appl_id[9];
1052         int err;
1053         int noblock = msg->msg_flags & MSG_DONTWAIT;
1054 
1055         err = sock_error(sk);
1056         if (err)
1057                 return err;
1058 
1059         if (msg->msg_flags & MSG_OOB)
1060                 return -EOPNOTSUPP;
1061 
1062         /* SOCK_SEQPACKET: we do not support segmented records */
1063         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1064                 return -EOPNOTSUPP;
1065 
1066         lock_sock(sk);
1067 
1068         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1069                 err = -EPIPE;
1070                 goto out;
1071         }
1072 
1073         /* Return if the socket is not in connected state */
1074         if (sk->sk_state != IUCV_CONNECTED) {
1075                 err = -ENOTCONN;
1076                 goto out;
1077         }
1078 
1079         /* initialize defaults */
1080         cmsg_done   = 0;        /* check for duplicate headers */
1081         txmsg.class = 0;
1082 
1083         /* iterate over control messages */
1084         for_each_cmsghdr(cmsg, msg) {
1085                 if (!CMSG_OK(msg, cmsg)) {
1086                         err = -EINVAL;
1087                         goto out;
1088                 }
1089 
1090                 if (cmsg->cmsg_level != SOL_IUCV)
1091                         continue;
1092 
1093                 if (cmsg->cmsg_type & cmsg_done) {
1094                         err = -EINVAL;
1095                         goto out;
1096                 }
1097                 cmsg_done |= cmsg->cmsg_type;
1098 
1099                 switch (cmsg->cmsg_type) {
1100                 case SCM_IUCV_TRGCLS:
1101                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1102                                 err = -EINVAL;
1103                                 goto out;
1104                         }
1105 
1106                         /* set iucv message target class */
1107                         memcpy(&txmsg.class,
1108                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1109 
1110                         break;
1111 
1112                 default:
1113                         err = -EINVAL;
1114                         goto out;
1115                 }
1116         }
1117 
1118         /* allocate one skb for each iucv message:
1119          * this is fine for SOCK_SEQPACKET (unless we want to support
1120          * segmented records using the MSG_EOR flag), but
1121          * for SOCK_STREAM we might want to improve it in future */
1122         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1123                 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1124                 linear = len;
1125         } else {
1126                 if (len < PAGE_SIZE) {
1127                         linear = len;
1128                 } else {
1129                         /* In nonlinear "classic" iucv skb,
1130                          * reserve space for iucv_array
1131                          */
1132                         headroom = sizeof(struct iucv_array) *
1133                                    (MAX_SKB_FRAGS + 1);
1134                         linear = PAGE_SIZE - headroom;
1135                 }
1136         }
1137         skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1138                                    noblock, &err, 0);
1139         if (!skb)
1140                 goto out;
1141         if (headroom)
1142                 skb_reserve(skb, headroom);
1143         skb_put(skb, linear);
1144         skb->len = len;
1145         skb->data_len = len - linear;
1146         err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1147         if (err)
1148                 goto fail;
1149 
1150         /* wait if outstanding messages for iucv path has reached */
1151         timeo = sock_sndtimeo(sk, noblock);
1152         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1153         if (err)
1154                 goto fail;
1155 
1156         /* return -ECONNRESET if the socket is no longer connected */
1157         if (sk->sk_state != IUCV_CONNECTED) {
1158                 err = -ECONNRESET;
1159                 goto fail;
1160         }
1161 
1162         /* increment and save iucv message tag for msg_completion cbk */
1163         txmsg.tag = iucv->send_tag++;
1164         IUCV_SKB_CB(skb)->tag = txmsg.tag;
1165 
1166         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1167                 atomic_inc(&iucv->msg_sent);
1168                 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1169                 if (err) {
1170                         atomic_dec(&iucv->msg_sent);
1171                         goto fail;
1172                 }
1173         } else { /* Classic VM IUCV transport */
1174                 skb_queue_tail(&iucv->send_skb_q, skb);
1175 
1176                 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1177                     skb->len <= 7) {
1178                         err = iucv_send_iprm(iucv->path, &txmsg, skb);
1179 
1180                         /* on success: there is no message_complete callback */
1181                         /* for an IPRMDATA msg; remove skb from send queue   */
1182                         if (err == 0) {
1183                                 skb_unlink(skb, &iucv->send_skb_q);
1184                                 kfree_skb(skb);
1185                         }
1186 
1187                         /* this error should never happen since the     */
1188                         /* IUCV_IPRMDATA path flag is set... sever path */
1189                         if (err == 0x15) {
1190                                 pr_iucv->path_sever(iucv->path, NULL);
1191                                 skb_unlink(skb, &iucv->send_skb_q);
1192                                 err = -EPIPE;
1193                                 goto fail;
1194                         }
1195                 } else if (skb_is_nonlinear(skb)) {
1196                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1197                         int i;
1198 
1199                         /* skip iucv_array lying in the headroom */
1200                         iba[0].address = (u32)(addr_t)skb->data;
1201                         iba[0].length = (u32)skb_headlen(skb);
1202                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1203                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1204 
1205                                 iba[i + 1].address =
1206                                         (u32)(addr_t)skb_frag_address(frag);
1207                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1208                         }
1209                         err = pr_iucv->message_send(iucv->path, &txmsg,
1210                                                     IUCV_IPBUFLST, 0,
1211                                                     (void *)iba, skb->len);
1212                 } else { /* non-IPRM Linear skb */
1213                         err = pr_iucv->message_send(iucv->path, &txmsg,
1214                                         0, 0, (void *)skb->data, skb->len);
1215                 }
1216                 if (err) {
1217                         if (err == 3) {
1218                                 user_id[8] = 0;
1219                                 memcpy(user_id, iucv->dst_user_id, 8);
1220                                 appl_id[8] = 0;
1221                                 memcpy(appl_id, iucv->dst_name, 8);
1222                                 pr_err(
1223                 "Application %s on z/VM guest %s exceeds message limit\n",
1224                                         appl_id, user_id);
1225                                 err = -EAGAIN;
1226                         } else {
1227                                 err = -EPIPE;
1228                         }
1229                         skb_unlink(skb, &iucv->send_skb_q);
1230                         goto fail;
1231                 }
1232         }
1233 
1234         release_sock(sk);
1235         return len;
1236 
1237 fail:
1238         kfree_skb(skb);
1239 out:
1240         release_sock(sk);
1241         return err;
1242 }
1243 
1244 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1245 {
1246         size_t headroom, linear;
1247         struct sk_buff *skb;
1248         int err;
1249 
1250         if (len < PAGE_SIZE) {
1251                 headroom = 0;
1252                 linear = len;
1253         } else {
1254                 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1255                 linear = PAGE_SIZE - headroom;
1256         }
1257         skb = alloc_skb_with_frags(headroom + linear, len - linear,
1258                                    0, &err, GFP_ATOMIC | GFP_DMA);
1259         WARN_ONCE(!skb,
1260                   "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1261                   len, err);
1262         if (skb) {
1263                 if (headroom)
1264                         skb_reserve(skb, headroom);
1265                 skb_put(skb, linear);
1266                 skb->len = len;
1267                 skb->data_len = len - linear;
1268         }
1269         return skb;
1270 }
1271 
1272 /* iucv_process_message() - Receive a single outstanding IUCV message
1273  *
1274  * Locking: must be called with message_q.lock held
1275  */
1276 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1277                                  struct iucv_path *path,
1278                                  struct iucv_message *msg)
1279 {
1280         int rc;
1281         unsigned int len;
1282 
1283         len = iucv_msg_length(msg);
1284 
1285         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1286         /* Note: the first 4 bytes are reserved for msg tag */
1287         IUCV_SKB_CB(skb)->class = msg->class;
1288 
1289         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1290         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1291                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1292                         skb->data = NULL;
1293                         skb->len = 0;
1294                 }
1295         } else {
1296                 if (skb_is_nonlinear(skb)) {
1297                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1298                         int i;
1299 
1300                         iba[0].address = (u32)(addr_t)skb->data;
1301                         iba[0].length = (u32)skb_headlen(skb);
1302                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1303                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1304 
1305                                 iba[i + 1].address =
1306                                         (u32)(addr_t)skb_frag_address(frag);
1307                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1308                         }
1309                         rc = pr_iucv->message_receive(path, msg,
1310                                               IUCV_IPBUFLST,
1311                                               (void *)iba, len, NULL);
1312                 } else {
1313                         rc = pr_iucv->message_receive(path, msg,
1314                                               msg->flags & IUCV_IPRMDATA,
1315                                               skb->data, len, NULL);
1316                 }
1317                 if (rc) {
1318                         kfree_skb(skb);
1319                         return;
1320                 }
1321                 WARN_ON_ONCE(skb->len != len);
1322         }
1323 
1324         IUCV_SKB_CB(skb)->offset = 0;
1325         if (sk_filter(sk, skb)) {
1326                 atomic_inc(&sk->sk_drops);      /* skb rejected by filter */
1327                 kfree_skb(skb);
1328                 return;
1329         }
1330         if (__sock_queue_rcv_skb(sk, skb))      /* handle rcv queue full */
1331                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1332 }
1333 
1334 /* iucv_process_message_q() - Process outstanding IUCV messages
1335  *
1336  * Locking: must be called with message_q.lock held
1337  */
1338 static void iucv_process_message_q(struct sock *sk)
1339 {
1340         struct iucv_sock *iucv = iucv_sk(sk);
1341         struct sk_buff *skb;
1342         struct sock_msg_q *p, *n;
1343 
1344         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1345                 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1346                 if (!skb)
1347                         break;
1348                 iucv_process_message(sk, skb, p->path, &p->msg);
1349                 list_del(&p->list);
1350                 kfree(p);
1351                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1352                         break;
1353         }
1354 }
1355 
1356 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1357                              size_t len, int flags)
1358 {
1359         int noblock = flags & MSG_DONTWAIT;
1360         struct sock *sk = sock->sk;
1361         struct iucv_sock *iucv = iucv_sk(sk);
1362         unsigned int copied, rlen;
1363         struct sk_buff *skb, *rskb, *cskb;
1364         int err = 0;
1365         u32 offset;
1366 
1367         if ((sk->sk_state == IUCV_DISCONN) &&
1368             skb_queue_empty(&iucv->backlog_skb_q) &&
1369             skb_queue_empty(&sk->sk_receive_queue) &&
1370             list_empty(&iucv->message_q.list))
1371                 return 0;
1372 
1373         if (flags & (MSG_OOB))
1374                 return -EOPNOTSUPP;
1375 
1376         /* receive/dequeue next skb:
1377          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1378         skb = skb_recv_datagram(sk, flags, noblock, &err);
1379         if (!skb) {
1380                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1381                         return 0;
1382                 return err;
1383         }
1384 
1385         offset = IUCV_SKB_CB(skb)->offset;
1386         rlen   = skb->len - offset;             /* real length of skb */
1387         copied = min_t(unsigned int, rlen, len);
1388         if (!rlen)
1389                 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1390 
1391         cskb = skb;
1392         if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1393                 if (!(flags & MSG_PEEK))
1394                         skb_queue_head(&sk->sk_receive_queue, skb);
1395                 return -EFAULT;
1396         }
1397 
1398         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1399         if (sk->sk_type == SOCK_SEQPACKET) {
1400                 if (copied < rlen)
1401                         msg->msg_flags |= MSG_TRUNC;
1402                 /* each iucv message contains a complete record */
1403                 msg->msg_flags |= MSG_EOR;
1404         }
1405 
1406         /* create control message to store iucv msg target class:
1407          * get the trgcls from the control buffer of the skb due to
1408          * fragmentation of original iucv message. */
1409         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1410                        sizeof(IUCV_SKB_CB(skb)->class),
1411                        (void *)&IUCV_SKB_CB(skb)->class);
1412         if (err) {
1413                 if (!(flags & MSG_PEEK))
1414                         skb_queue_head(&sk->sk_receive_queue, skb);
1415                 return err;
1416         }
1417 
1418         /* Mark read part of skb as used */
1419         if (!(flags & MSG_PEEK)) {
1420 
1421                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1422                 if (sk->sk_type == SOCK_STREAM) {
1423                         if (copied < rlen) {
1424                                 IUCV_SKB_CB(skb)->offset = offset + copied;
1425                                 skb_queue_head(&sk->sk_receive_queue, skb);
1426                                 goto done;
1427                         }
1428                 }
1429 
1430                 kfree_skb(skb);
1431                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1432                         atomic_inc(&iucv->msg_recv);
1433                         if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1434                                 WARN_ON(1);
1435                                 iucv_sock_close(sk);
1436                                 return -EFAULT;
1437                         }
1438                 }
1439 
1440                 /* Queue backlog skbs */
1441                 spin_lock_bh(&iucv->message_q.lock);
1442                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1443                 while (rskb) {
1444                         IUCV_SKB_CB(rskb)->offset = 0;
1445                         if (__sock_queue_rcv_skb(sk, rskb)) {
1446                                 /* handle rcv queue full */
1447                                 skb_queue_head(&iucv->backlog_skb_q,
1448                                                 rskb);
1449                                 break;
1450                         }
1451                         rskb = skb_dequeue(&iucv->backlog_skb_q);
1452                 }
1453                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1454                         if (!list_empty(&iucv->message_q.list))
1455                                 iucv_process_message_q(sk);
1456                         if (atomic_read(&iucv->msg_recv) >=
1457                                                         iucv->msglimit / 2) {
1458                                 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1459                                 if (err) {
1460                                         sk->sk_state = IUCV_DISCONN;
1461                                         sk->sk_state_change(sk);
1462                                 }
1463                         }
1464                 }
1465                 spin_unlock_bh(&iucv->message_q.lock);
1466         }
1467 
1468 done:
1469         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1470         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1471                 copied = rlen;
1472 
1473         return copied;
1474 }
1475 
1476 static inline __poll_t iucv_accept_poll(struct sock *parent)
1477 {
1478         struct iucv_sock *isk, *n;
1479         struct sock *sk;
1480 
1481         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1482                 sk = (struct sock *) isk;
1483 
1484                 if (sk->sk_state == IUCV_CONNECTED)
1485                         return EPOLLIN | EPOLLRDNORM;
1486         }
1487 
1488         return 0;
1489 }
1490 
1491 __poll_t iucv_sock_poll(struct file *file, struct socket *sock,
1492                             poll_table *wait)
1493 {
1494         struct sock *sk = sock->sk;
1495         __poll_t mask = 0;
1496 
1497         sock_poll_wait(file, sk_sleep(sk), wait);
1498 
1499         if (sk->sk_state == IUCV_LISTEN)
1500                 return iucv_accept_poll(sk);
1501 
1502         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1503                 mask |= EPOLLERR |
1504                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
1505 
1506         if (sk->sk_shutdown & RCV_SHUTDOWN)
1507                 mask |= EPOLLRDHUP;
1508 
1509         if (sk->sk_shutdown == SHUTDOWN_MASK)
1510                 mask |= EPOLLHUP;
1511 
1512         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1513             (sk->sk_shutdown & RCV_SHUTDOWN))
1514                 mask |= EPOLLIN | EPOLLRDNORM;
1515 
1516         if (sk->sk_state == IUCV_CLOSED)
1517                 mask |= EPOLLHUP;
1518 
1519         if (sk->sk_state == IUCV_DISCONN)
1520                 mask |= EPOLLIN;
1521 
1522         if (sock_writeable(sk) && iucv_below_msglim(sk))
1523                 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
1524         else
1525                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1526 
1527         return mask;
1528 }
1529 
1530 static int iucv_sock_shutdown(struct socket *sock, int how)
1531 {
1532         struct sock *sk = sock->sk;
1533         struct iucv_sock *iucv = iucv_sk(sk);
1534         struct iucv_message txmsg;
1535         int err = 0;
1536 
1537         how++;
1538 
1539         if ((how & ~SHUTDOWN_MASK) || !how)
1540                 return -EINVAL;
1541 
1542         lock_sock(sk);
1543         switch (sk->sk_state) {
1544         case IUCV_LISTEN:
1545         case IUCV_DISCONN:
1546         case IUCV_CLOSING:
1547         case IUCV_CLOSED:
1548                 err = -ENOTCONN;
1549                 goto fail;
1550         default:
1551                 break;
1552         }
1553 
1554         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1555                 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1556                         txmsg.class = 0;
1557                         txmsg.tag = 0;
1558                         err = pr_iucv->message_send(iucv->path, &txmsg,
1559                                 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1560                         if (err) {
1561                                 switch (err) {
1562                                 case 1:
1563                                         err = -ENOTCONN;
1564                                         break;
1565                                 case 2:
1566                                         err = -ECONNRESET;
1567                                         break;
1568                                 default:
1569                                         err = -ENOTCONN;
1570                                         break;
1571                                 }
1572                         }
1573                 } else
1574                         iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1575         }
1576 
1577         sk->sk_shutdown |= how;
1578         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1579                 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1580                     iucv->path) {
1581                         err = pr_iucv->path_quiesce(iucv->path, NULL);
1582                         if (err)
1583                                 err = -ENOTCONN;
1584 /*                      skb_queue_purge(&sk->sk_receive_queue); */
1585                 }
1586                 skb_queue_purge(&sk->sk_receive_queue);
1587         }
1588 
1589         /* Wake up anyone sleeping in poll */
1590         sk->sk_state_change(sk);
1591 
1592 fail:
1593         release_sock(sk);
1594         return err;
1595 }
1596 
1597 static int iucv_sock_release(struct socket *sock)
1598 {
1599         struct sock *sk = sock->sk;
1600         int err = 0;
1601 
1602         if (!sk)
1603                 return 0;
1604 
1605         iucv_sock_close(sk);
1606 
1607         sock_orphan(sk);
1608         iucv_sock_kill(sk);
1609         return err;
1610 }
1611 
1612 /* getsockopt and setsockopt */
1613 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1614                                 char __user *optval, unsigned int optlen)
1615 {
1616         struct sock *sk = sock->sk;
1617         struct iucv_sock *iucv = iucv_sk(sk);
1618         int val;
1619         int rc;
1620 
1621         if (level != SOL_IUCV)
1622                 return -ENOPROTOOPT;
1623 
1624         if (optlen < sizeof(int))
1625                 return -EINVAL;
1626 
1627         if (get_user(val, (int __user *) optval))
1628                 return -EFAULT;
1629 
1630         rc = 0;
1631 
1632         lock_sock(sk);
1633         switch (optname) {
1634         case SO_IPRMDATA_MSG:
1635                 if (val)
1636                         iucv->flags |= IUCV_IPRMDATA;
1637                 else
1638                         iucv->flags &= ~IUCV_IPRMDATA;
1639                 break;
1640         case SO_MSGLIMIT:
1641                 switch (sk->sk_state) {
1642                 case IUCV_OPEN:
1643                 case IUCV_BOUND:
1644                         if (val < 1 || val > (u16)(~0))
1645                                 rc = -EINVAL;
1646                         else
1647                                 iucv->msglimit = val;
1648                         break;
1649                 default:
1650                         rc = -EINVAL;
1651                         break;
1652                 }
1653                 break;
1654         default:
1655                 rc = -ENOPROTOOPT;
1656                 break;
1657         }
1658         release_sock(sk);
1659 
1660         return rc;
1661 }
1662 
1663 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1664                                 char __user *optval, int __user *optlen)
1665 {
1666         struct sock *sk = sock->sk;
1667         struct iucv_sock *iucv = iucv_sk(sk);
1668         unsigned int val;
1669         int len;
1670 
1671         if (level != SOL_IUCV)
1672                 return -ENOPROTOOPT;
1673 
1674         if (get_user(len, optlen))
1675                 return -EFAULT;
1676 
1677         if (len < 0)
1678                 return -EINVAL;
1679 
1680         len = min_t(unsigned int, len, sizeof(int));
1681 
1682         switch (optname) {
1683         case SO_IPRMDATA_MSG:
1684                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1685                 break;
1686         case SO_MSGLIMIT:
1687                 lock_sock(sk);
1688                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1689                                            : iucv->msglimit;    /* default */
1690                 release_sock(sk);
1691                 break;
1692         case SO_MSGSIZE:
1693                 if (sk->sk_state == IUCV_OPEN)
1694                         return -EBADFD;
1695                 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1696                                 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1697                                 0x7fffffff;
1698                 break;
1699         default:
1700                 return -ENOPROTOOPT;
1701         }
1702 
1703         if (put_user(len, optlen))
1704                 return -EFAULT;
1705         if (copy_to_user(optval, &val, len))
1706                 return -EFAULT;
1707 
1708         return 0;
1709 }
1710 
1711 
1712 /* Callback wrappers - called from iucv base support */
1713 static int iucv_callback_connreq(struct iucv_path *path,
1714                                  u8 ipvmid[8], u8 ipuser[16])
1715 {
1716         unsigned char user_data[16];
1717         unsigned char nuser_data[16];
1718         unsigned char src_name[8];
1719         struct sock *sk, *nsk;
1720         struct iucv_sock *iucv, *niucv;
1721         int err;
1722 
1723         memcpy(src_name, ipuser, 8);
1724         EBCASC(src_name, 8);
1725         /* Find out if this path belongs to af_iucv. */
1726         read_lock(&iucv_sk_list.lock);
1727         iucv = NULL;
1728         sk = NULL;
1729         sk_for_each(sk, &iucv_sk_list.head)
1730                 if (sk->sk_state == IUCV_LISTEN &&
1731                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1732                         /*
1733                          * Found a listening socket with
1734                          * src_name == ipuser[0-7].
1735                          */
1736                         iucv = iucv_sk(sk);
1737                         break;
1738                 }
1739         read_unlock(&iucv_sk_list.lock);
1740         if (!iucv)
1741                 /* No socket found, not one of our paths. */
1742                 return -EINVAL;
1743 
1744         bh_lock_sock(sk);
1745 
1746         /* Check if parent socket is listening */
1747         low_nmcpy(user_data, iucv->src_name);
1748         high_nmcpy(user_data, iucv->dst_name);
1749         ASCEBC(user_data, sizeof(user_data));
1750         if (sk->sk_state != IUCV_LISTEN) {
1751                 err = pr_iucv->path_sever(path, user_data);
1752                 iucv_path_free(path);
1753                 goto fail;
1754         }
1755 
1756         /* Check for backlog size */
1757         if (sk_acceptq_is_full(sk)) {
1758                 err = pr_iucv->path_sever(path, user_data);
1759                 iucv_path_free(path);
1760                 goto fail;
1761         }
1762 
1763         /* Create the new socket */
1764         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1765         if (!nsk) {
1766                 err = pr_iucv->path_sever(path, user_data);
1767                 iucv_path_free(path);
1768                 goto fail;
1769         }
1770 
1771         niucv = iucv_sk(nsk);
1772         iucv_sock_init(nsk, sk);
1773 
1774         /* Set the new iucv_sock */
1775         memcpy(niucv->dst_name, ipuser + 8, 8);
1776         EBCASC(niucv->dst_name, 8);
1777         memcpy(niucv->dst_user_id, ipvmid, 8);
1778         memcpy(niucv->src_name, iucv->src_name, 8);
1779         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1780         niucv->path = path;
1781 
1782         /* Call iucv_accept */
1783         high_nmcpy(nuser_data, ipuser + 8);
1784         memcpy(nuser_data + 8, niucv->src_name, 8);
1785         ASCEBC(nuser_data + 8, 8);
1786 
1787         /* set message limit for path based on msglimit of accepting socket */
1788         niucv->msglimit = iucv->msglimit;
1789         path->msglim = iucv->msglimit;
1790         err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1791         if (err) {
1792                 iucv_sever_path(nsk, 1);
1793                 iucv_sock_kill(nsk);
1794                 goto fail;
1795         }
1796 
1797         iucv_accept_enqueue(sk, nsk);
1798 
1799         /* Wake up accept */
1800         nsk->sk_state = IUCV_CONNECTED;
1801         sk->sk_data_ready(sk);
1802         err = 0;
1803 fail:
1804         bh_unlock_sock(sk);
1805         return 0;
1806 }
1807 
1808 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1809 {
1810         struct sock *sk = path->private;
1811 
1812         sk->sk_state = IUCV_CONNECTED;
1813         sk->sk_state_change(sk);
1814 }
1815 
1816 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1817 {
1818         struct sock *sk = path->private;
1819         struct iucv_sock *iucv = iucv_sk(sk);
1820         struct sk_buff *skb;
1821         struct sock_msg_q *save_msg;
1822         int len;
1823 
1824         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1825                 pr_iucv->message_reject(path, msg);
1826                 return;
1827         }
1828 
1829         spin_lock(&iucv->message_q.lock);
1830 
1831         if (!list_empty(&iucv->message_q.list) ||
1832             !skb_queue_empty(&iucv->backlog_skb_q))
1833                 goto save_message;
1834 
1835         len = atomic_read(&sk->sk_rmem_alloc);
1836         len += SKB_TRUESIZE(iucv_msg_length(msg));
1837         if (len > sk->sk_rcvbuf)
1838                 goto save_message;
1839 
1840         skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1841         if (!skb)
1842                 goto save_message;
1843 
1844         iucv_process_message(sk, skb, path, msg);
1845         goto out_unlock;
1846 
1847 save_message:
1848         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1849         if (!save_msg)
1850                 goto out_unlock;
1851         save_msg->path = path;
1852         save_msg->msg = *msg;
1853 
1854         list_add_tail(&save_msg->list, &iucv->message_q.list);
1855 
1856 out_unlock:
1857         spin_unlock(&iucv->message_q.lock);
1858 }
1859 
1860 static void iucv_callback_txdone(struct iucv_path *path,
1861                                  struct iucv_message *msg)
1862 {
1863         struct sock *sk = path->private;
1864         struct sk_buff *this = NULL;
1865         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1866         struct sk_buff *list_skb = list->next;
1867         unsigned long flags;
1868 
1869         bh_lock_sock(sk);
1870         if (!skb_queue_empty(list)) {
1871                 spin_lock_irqsave(&list->lock, flags);
1872 
1873                 while (list_skb != (struct sk_buff *)list) {
1874                         if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1875                                 this = list_skb;
1876                                 break;
1877                         }
1878                         list_skb = list_skb->next;
1879                 }
1880                 if (this)
1881                         __skb_unlink(this, list);
1882 
1883                 spin_unlock_irqrestore(&list->lock, flags);
1884 
1885                 if (this) {
1886                         kfree_skb(this);
1887                         /* wake up any process waiting for sending */
1888                         iucv_sock_wake_msglim(sk);
1889                 }
1890         }
1891 
1892         if (sk->sk_state == IUCV_CLOSING) {
1893                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1894                         sk->sk_state = IUCV_CLOSED;
1895                         sk->sk_state_change(sk);
1896                 }
1897         }
1898         bh_unlock_sock(sk);
1899 
1900 }
1901 
1902 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1903 {
1904         struct sock *sk = path->private;
1905 
1906         if (sk->sk_state == IUCV_CLOSED)
1907                 return;
1908 
1909         bh_lock_sock(sk);
1910         iucv_sever_path(sk, 1);
1911         sk->sk_state = IUCV_DISCONN;
1912 
1913         sk->sk_state_change(sk);
1914         bh_unlock_sock(sk);
1915 }
1916 
1917 /* called if the other communication side shuts down its RECV direction;
1918  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1919  */
1920 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1921 {
1922         struct sock *sk = path->private;
1923 
1924         bh_lock_sock(sk);
1925         if (sk->sk_state != IUCV_CLOSED) {
1926                 sk->sk_shutdown |= SEND_SHUTDOWN;
1927                 sk->sk_state_change(sk);
1928         }
1929         bh_unlock_sock(sk);
1930 }
1931 
1932 /***************** HiperSockets transport callbacks ********************/
1933 static void afiucv_swap_src_dest(struct sk_buff *skb)
1934 {
1935         struct af_iucv_trans_hdr *trans_hdr =
1936                                 (struct af_iucv_trans_hdr *)skb->data;
1937         char tmpID[8];
1938         char tmpName[8];
1939 
1940         ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1941         ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1942         ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1943         ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1944         memcpy(tmpID, trans_hdr->srcUserID, 8);
1945         memcpy(tmpName, trans_hdr->srcAppName, 8);
1946         memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1947         memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1948         memcpy(trans_hdr->destUserID, tmpID, 8);
1949         memcpy(trans_hdr->destAppName, tmpName, 8);
1950         skb_push(skb, ETH_HLEN);
1951         memset(skb->data, 0, ETH_HLEN);
1952 }
1953 
1954 /**
1955  * afiucv_hs_callback_syn - react on received SYN
1956  **/
1957 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1958 {
1959         struct sock *nsk;
1960         struct iucv_sock *iucv, *niucv;
1961         struct af_iucv_trans_hdr *trans_hdr;
1962         int err;
1963 
1964         iucv = iucv_sk(sk);
1965         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1966         if (!iucv) {
1967                 /* no sock - connection refused */
1968                 afiucv_swap_src_dest(skb);
1969                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1970                 err = dev_queue_xmit(skb);
1971                 goto out;
1972         }
1973 
1974         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0);
1975         bh_lock_sock(sk);
1976         if ((sk->sk_state != IUCV_LISTEN) ||
1977             sk_acceptq_is_full(sk) ||
1978             !nsk) {
1979                 /* error on server socket - connection refused */
1980                 afiucv_swap_src_dest(skb);
1981                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1982                 err = dev_queue_xmit(skb);
1983                 iucv_sock_kill(nsk);
1984                 bh_unlock_sock(sk);
1985                 goto out;
1986         }
1987 
1988         niucv = iucv_sk(nsk);
1989         iucv_sock_init(nsk, sk);
1990         niucv->transport = AF_IUCV_TRANS_HIPER;
1991         niucv->msglimit = iucv->msglimit;
1992         if (!trans_hdr->window)
1993                 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1994         else
1995                 niucv->msglimit_peer = trans_hdr->window;
1996         memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1997         memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
1998         memcpy(niucv->src_name, iucv->src_name, 8);
1999         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2000         nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2001         niucv->hs_dev = iucv->hs_dev;
2002         dev_hold(niucv->hs_dev);
2003         afiucv_swap_src_dest(skb);
2004         trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2005         trans_hdr->window = niucv->msglimit;
2006         /* if receiver acks the xmit connection is established */
2007         err = dev_queue_xmit(skb);
2008         if (!err) {
2009                 iucv_accept_enqueue(sk, nsk);
2010                 nsk->sk_state = IUCV_CONNECTED;
2011                 sk->sk_data_ready(sk);
2012         } else
2013                 iucv_sock_kill(nsk);
2014         bh_unlock_sock(sk);
2015 
2016 out:
2017         return NET_RX_SUCCESS;
2018 }
2019 
2020 /**
2021  * afiucv_hs_callback_synack() - react on received SYN-ACK
2022  **/
2023 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2024 {
2025         struct iucv_sock *iucv = iucv_sk(sk);
2026         struct af_iucv_trans_hdr *trans_hdr =
2027                                         (struct af_iucv_trans_hdr *)skb->data;
2028 
2029         if (!iucv)
2030                 goto out;
2031         if (sk->sk_state != IUCV_BOUND)
2032                 goto out;
2033         bh_lock_sock(sk);
2034         iucv->msglimit_peer = trans_hdr->window;
2035         sk->sk_state = IUCV_CONNECTED;
2036         sk->sk_state_change(sk);
2037         bh_unlock_sock(sk);
2038 out:
2039         kfree_skb(skb);
2040         return NET_RX_SUCCESS;
2041 }
2042 
2043 /**
2044  * afiucv_hs_callback_synfin() - react on received SYN_FIN
2045  **/
2046 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2047 {
2048         struct iucv_sock *iucv = iucv_sk(sk);
2049 
2050         if (!iucv)
2051                 goto out;
2052         if (sk->sk_state != IUCV_BOUND)
2053                 goto out;
2054         bh_lock_sock(sk);
2055         sk->sk_state = IUCV_DISCONN;
2056         sk->sk_state_change(sk);
2057         bh_unlock_sock(sk);
2058 out:
2059         kfree_skb(skb);
2060         return NET_RX_SUCCESS;
2061 }
2062 
2063 /**
2064  * afiucv_hs_callback_fin() - react on received FIN
2065  **/
2066 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2067 {
2068         struct iucv_sock *iucv = iucv_sk(sk);
2069 
2070         /* other end of connection closed */
2071         if (!iucv)
2072                 goto out;
2073         bh_lock_sock(sk);
2074         if (sk->sk_state == IUCV_CONNECTED) {
2075                 sk->sk_state = IUCV_DISCONN;
2076                 sk->sk_state_change(sk);
2077         }
2078         bh_unlock_sock(sk);
2079 out:
2080         kfree_skb(skb);
2081         return NET_RX_SUCCESS;
2082 }
2083 
2084 /**
2085  * afiucv_hs_callback_win() - react on received WIN
2086  **/
2087 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2088 {
2089         struct iucv_sock *iucv = iucv_sk(sk);
2090         struct af_iucv_trans_hdr *trans_hdr =
2091                                         (struct af_iucv_trans_hdr *)skb->data;
2092 
2093         if (!iucv)
2094                 return NET_RX_SUCCESS;
2095 
2096         if (sk->sk_state != IUCV_CONNECTED)
2097                 return NET_RX_SUCCESS;
2098 
2099         atomic_sub(trans_hdr->window, &iucv->msg_sent);
2100         iucv_sock_wake_msglim(sk);
2101         return NET_RX_SUCCESS;
2102 }
2103 
2104 /**
2105  * afiucv_hs_callback_rx() - react on received data
2106  **/
2107 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2108 {
2109         struct iucv_sock *iucv = iucv_sk(sk);
2110 
2111         if (!iucv) {
2112                 kfree_skb(skb);
2113                 return NET_RX_SUCCESS;
2114         }
2115 
2116         if (sk->sk_state != IUCV_CONNECTED) {
2117                 kfree_skb(skb);
2118                 return NET_RX_SUCCESS;
2119         }
2120 
2121         if (sk->sk_shutdown & RCV_SHUTDOWN) {
2122                 kfree_skb(skb);
2123                 return NET_RX_SUCCESS;
2124         }
2125 
2126         /* write stuff from iucv_msg to skb cb */
2127         skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2128         skb_reset_transport_header(skb);
2129         skb_reset_network_header(skb);
2130         IUCV_SKB_CB(skb)->offset = 0;
2131         if (sk_filter(sk, skb)) {
2132                 atomic_inc(&sk->sk_drops);      /* skb rejected by filter */
2133                 kfree_skb(skb);
2134                 return NET_RX_SUCCESS;
2135         }
2136 
2137         spin_lock(&iucv->message_q.lock);
2138         if (skb_queue_empty(&iucv->backlog_skb_q)) {
2139                 if (__sock_queue_rcv_skb(sk, skb))
2140                         /* handle rcv queue full */
2141                         skb_queue_tail(&iucv->backlog_skb_q, skb);
2142         } else
2143                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2144         spin_unlock(&iucv->message_q.lock);
2145         return NET_RX_SUCCESS;
2146 }
2147 
2148 /**
2149  * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2150  *                   transport
2151  *                   called from netif RX softirq
2152  **/
2153 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2154         struct packet_type *pt, struct net_device *orig_dev)
2155 {
2156         struct sock *sk;
2157         struct iucv_sock *iucv;
2158         struct af_iucv_trans_hdr *trans_hdr;
2159         char nullstring[8];
2160         int err = 0;
2161 
2162         if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2163                 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2164                           (int)skb->len,
2165                           (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2166                 kfree_skb(skb);
2167                 return NET_RX_SUCCESS;
2168         }
2169         if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2170                 if (skb_linearize(skb)) {
2171                         WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2172                                   (int)skb->len);
2173                         kfree_skb(skb);
2174                         return NET_RX_SUCCESS;
2175                 }
2176         skb_pull(skb, ETH_HLEN);
2177         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2178         EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2179         EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2180         EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2181         EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2182         memset(nullstring, 0, sizeof(nullstring));
2183         iucv = NULL;
2184         sk = NULL;
2185         read_lock(&iucv_sk_list.lock);
2186         sk_for_each(sk, &iucv_sk_list.head) {
2187                 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2188                         if ((!memcmp(&iucv_sk(sk)->src_name,
2189                                      trans_hdr->destAppName, 8)) &&
2190                             (!memcmp(&iucv_sk(sk)->src_user_id,
2191                                      trans_hdr->destUserID, 8)) &&
2192                             (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2193                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2194                                      nullstring, 8))) {
2195                                 iucv = iucv_sk(sk);
2196                                 break;
2197                         }
2198                 } else {
2199                         if ((!memcmp(&iucv_sk(sk)->src_name,
2200                                      trans_hdr->destAppName, 8)) &&
2201                             (!memcmp(&iucv_sk(sk)->src_user_id,
2202                                      trans_hdr->destUserID, 8)) &&
2203                             (!memcmp(&iucv_sk(sk)->dst_name,
2204                                      trans_hdr->srcAppName, 8)) &&
2205                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2206                                      trans_hdr->srcUserID, 8))) {
2207                                 iucv = iucv_sk(sk);
2208                                 break;
2209                         }
2210                 }
2211         }
2212         read_unlock(&iucv_sk_list.lock);
2213         if (!iucv)
2214                 sk = NULL;
2215 
2216         /* no sock
2217         how should we send with no sock
2218         1) send without sock no send rc checking?
2219         2) introduce default sock to handle this cases
2220 
2221          SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2222          data -> send FIN
2223          SYN|ACK, SYN|FIN, FIN -> no action? */
2224 
2225         switch (trans_hdr->flags) {
2226         case AF_IUCV_FLAG_SYN:
2227                 /* connect request */
2228                 err = afiucv_hs_callback_syn(sk, skb);
2229                 break;
2230         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2231                 /* connect request confirmed */
2232                 err = afiucv_hs_callback_synack(sk, skb);
2233                 break;
2234         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2235                 /* connect request refused */
2236                 err = afiucv_hs_callback_synfin(sk, skb);
2237                 break;
2238         case (AF_IUCV_FLAG_FIN):
2239                 /* close request */
2240                 err = afiucv_hs_callback_fin(sk, skb);
2241                 break;
2242         case (AF_IUCV_FLAG_WIN):
2243                 err = afiucv_hs_callback_win(sk, skb);
2244                 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2245                         kfree_skb(skb);
2246                         break;
2247                 }
2248                 /* fall through and receive non-zero length data */
2249         case (AF_IUCV_FLAG_SHT):
2250                 /* shutdown request */
2251                 /* fall through and receive zero length data */
2252         case 0:
2253                 /* plain data frame */
2254                 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2255                 err = afiucv_hs_callback_rx(sk, skb);
2256                 break;
2257         default:
2258                 ;
2259         }
2260 
2261         return err;
2262 }
2263 
2264 /**
2265  * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2266  *                                 transport
2267  **/
2268 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2269                                         enum iucv_tx_notify n)
2270 {
2271         struct sock *isk = skb->sk;
2272         struct sock *sk = NULL;
2273         struct iucv_sock *iucv = NULL;
2274         struct sk_buff_head *list;
2275         struct sk_buff *list_skb;
2276         struct sk_buff *nskb;
2277         unsigned long flags;
2278 
2279         read_lock_irqsave(&iucv_sk_list.lock, flags);
2280         sk_for_each(sk, &iucv_sk_list.head)
2281                 if (sk == isk) {
2282                         iucv = iucv_sk(sk);
2283                         break;
2284                 }
2285         read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2286 
2287         if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2288                 return;
2289 
2290         list = &iucv->send_skb_q;
2291         spin_lock_irqsave(&list->lock, flags);
2292         if (skb_queue_empty(list))
2293                 goto out_unlock;
2294         list_skb = list->next;
2295         nskb = list_skb->next;
2296         while (list_skb != (struct sk_buff *)list) {
2297                 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2298                         switch (n) {
2299                         case TX_NOTIFY_OK:
2300                                 __skb_unlink(list_skb, list);
2301                                 kfree_skb(list_skb);
2302                                 iucv_sock_wake_msglim(sk);
2303                                 break;
2304                         case TX_NOTIFY_PENDING:
2305                                 atomic_inc(&iucv->pendings);
2306                                 break;
2307                         case TX_NOTIFY_DELAYED_OK:
2308                                 __skb_unlink(list_skb, list);
2309                                 atomic_dec(&iucv->pendings);
2310                                 if (atomic_read(&iucv->pendings) <= 0)
2311                                         iucv_sock_wake_msglim(sk);
2312                                 kfree_skb(list_skb);
2313                                 break;
2314                         case TX_NOTIFY_UNREACHABLE:
2315                         case TX_NOTIFY_DELAYED_UNREACHABLE:
2316                         case TX_NOTIFY_TPQFULL: /* not yet used */
2317                         case TX_NOTIFY_GENERALERROR:
2318                         case TX_NOTIFY_DELAYED_GENERALERROR:
2319                                 __skb_unlink(list_skb, list);
2320                                 kfree_skb(list_skb);
2321                                 if (sk->sk_state == IUCV_CONNECTED) {
2322                                         sk->sk_state = IUCV_DISCONN;
2323                                         sk->sk_state_change(sk);
2324                                 }
2325                                 break;
2326                         }
2327                         break;
2328                 }
2329                 list_skb = nskb;
2330                 nskb = nskb->next;
2331         }
2332 out_unlock:
2333         spin_unlock_irqrestore(&list->lock, flags);
2334 
2335         if (sk->sk_state == IUCV_CLOSING) {
2336                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2337                         sk->sk_state = IUCV_CLOSED;
2338                         sk->sk_state_change(sk);
2339                 }
2340         }
2341 
2342 }
2343 
2344 /*
2345  * afiucv_netdev_event: handle netdev notifier chain events
2346  */
2347 static int afiucv_netdev_event(struct notifier_block *this,
2348                                unsigned long event, void *ptr)
2349 {
2350         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2351         struct sock *sk;
2352         struct iucv_sock *iucv;
2353 
2354         switch (event) {
2355         case NETDEV_REBOOT:
2356         case NETDEV_GOING_DOWN:
2357                 sk_for_each(sk, &iucv_sk_list.head) {
2358                         iucv = iucv_sk(sk);
2359                         if ((iucv->hs_dev == event_dev) &&
2360                             (sk->sk_state == IUCV_CONNECTED)) {
2361                                 if (event == NETDEV_GOING_DOWN)
2362                                         iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2363                                 sk->sk_state = IUCV_DISCONN;
2364                                 sk->sk_state_change(sk);
2365                         }
2366                 }
2367                 break;
2368         case NETDEV_DOWN:
2369         case NETDEV_UNREGISTER:
2370         default:
2371                 break;
2372         }
2373         return NOTIFY_DONE;
2374 }
2375 
2376 static struct notifier_block afiucv_netdev_notifier = {
2377         .notifier_call = afiucv_netdev_event,
2378 };
2379 
2380 static const struct proto_ops iucv_sock_ops = {
2381         .family         = PF_IUCV,
2382         .owner          = THIS_MODULE,
2383         .release        = iucv_sock_release,
2384         .bind           = iucv_sock_bind,
2385         .connect        = iucv_sock_connect,
2386         .listen         = iucv_sock_listen,
2387         .accept         = iucv_sock_accept,
2388         .getname        = iucv_sock_getname,
2389         .sendmsg        = iucv_sock_sendmsg,
2390         .recvmsg        = iucv_sock_recvmsg,
2391         .poll           = iucv_sock_poll,
2392         .ioctl          = sock_no_ioctl,
2393         .mmap           = sock_no_mmap,
2394         .socketpair     = sock_no_socketpair,
2395         .shutdown       = iucv_sock_shutdown,
2396         .setsockopt     = iucv_sock_setsockopt,
2397         .getsockopt     = iucv_sock_getsockopt,
2398 };
2399 
2400 static const struct net_proto_family iucv_sock_family_ops = {
2401         .family = AF_IUCV,
2402         .owner  = THIS_MODULE,
2403         .create = iucv_sock_create,
2404 };
2405 
2406 static struct packet_type iucv_packet_type = {
2407         .type = cpu_to_be16(ETH_P_AF_IUCV),
2408         .func = afiucv_hs_rcv,
2409 };
2410 
2411 static int afiucv_iucv_init(void)
2412 {
2413         int err;
2414 
2415         err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2416         if (err)
2417                 goto out;
2418         /* establish dummy device */
2419         af_iucv_driver.bus = pr_iucv->bus;
2420         err = driver_register(&af_iucv_driver);
2421         if (err)
2422                 goto out_iucv;
2423         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2424         if (!af_iucv_dev) {
2425                 err = -ENOMEM;
2426                 goto out_driver;
2427         }
2428         dev_set_name(af_iucv_dev, "af_iucv");
2429         af_iucv_dev->bus = pr_iucv->bus;
2430         af_iucv_dev->parent = pr_iucv->root;
2431         af_iucv_dev->release = (void (*)(struct device *))kfree;
2432         af_iucv_dev->driver = &af_iucv_driver;
2433         err = device_register(af_iucv_dev);
2434         if (err)
2435                 goto out_iucv_dev;
2436         return 0;
2437 
2438 out_iucv_dev:
2439         put_device(af_iucv_dev);
2440 out_driver:
2441         driver_unregister(&af_iucv_driver);
2442 out_iucv:
2443         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2444 out:
2445         return err;
2446 }
2447 
2448 static int __init afiucv_init(void)
2449 {
2450         int err;
2451 
2452         if (MACHINE_IS_VM) {
2453                 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2454                 if (unlikely(err)) {
2455                         WARN_ON(err);
2456                         err = -EPROTONOSUPPORT;
2457                         goto out;
2458                 }
2459 
2460                 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2461                 if (!pr_iucv) {
2462                         printk(KERN_WARNING "iucv_if lookup failed\n");
2463                         memset(&iucv_userid, 0, sizeof(iucv_userid));
2464                 }
2465         } else {
2466                 memset(&iucv_userid, 0, sizeof(iucv_userid));
2467                 pr_iucv = NULL;
2468         }
2469 
2470         err = proto_register(&iucv_proto, 0);
2471         if (err)
2472                 goto out;
2473         err = sock_register(&iucv_sock_family_ops);
2474         if (err)
2475                 goto out_proto;
2476 
2477         if (pr_iucv) {
2478                 err = afiucv_iucv_init();
2479                 if (err)
2480                         goto out_sock;
2481         } else
2482                 register_netdevice_notifier(&afiucv_netdev_notifier);
2483         dev_add_pack(&iucv_packet_type);
2484         return 0;
2485 
2486 out_sock:
2487         sock_unregister(PF_IUCV);
2488 out_proto:
2489         proto_unregister(&iucv_proto);
2490 out:
2491         if (pr_iucv)
2492                 symbol_put(iucv_if);
2493         return err;
2494 }
2495 
2496 static void __exit afiucv_exit(void)
2497 {
2498         if (pr_iucv) {
2499                 device_unregister(af_iucv_dev);
2500                 driver_unregister(&af_iucv_driver);
2501                 pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2502                 symbol_put(iucv_if);
2503         } else
2504                 unregister_netdevice_notifier(&afiucv_netdev_notifier);
2505         dev_remove_pack(&iucv_packet_type);
2506         sock_unregister(PF_IUCV);
2507         proto_unregister(&iucv_proto);
2508 }
2509 
2510 module_init(afiucv_init);
2511 module_exit(afiucv_exit);
2512 
2513 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2514 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2515 MODULE_VERSION(VERSION);
2516 MODULE_LICENSE("GPL");
2517 MODULE_ALIAS_NETPROTO(PF_IUCV);
2518 
2519 

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