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Commit | Line | Data |
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eac3731b | 1 | /* |
eac3731b JH |
2 | * IUCV protocol stack for Linux on zSeries |
3 | * | |
c23cad92 | 4 | * Copyright IBM Corp. 2006, 2009 |
eac3731b JH |
5 | * |
6 | * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> | |
c23cad92 UB |
7 | * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> |
8 | * PM functions: | |
9 | * Ursula Braun <ursula.braun@de.ibm.com> | |
eac3731b JH |
10 | */ |
11 | ||
8f7c502c UB |
12 | #define KMSG_COMPONENT "af_iucv" |
13 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
14 | ||
eac3731b JH |
15 | #include <linux/module.h> |
16 | #include <linux/types.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/poll.h> | |
25 | #include <net/sock.h> | |
26 | #include <asm/ebcdic.h> | |
27 | #include <asm/cpcmd.h> | |
28 | #include <linux/kmod.h> | |
29 | ||
30 | #include <net/iucv/iucv.h> | |
31 | #include <net/iucv/af_iucv.h> | |
32 | ||
9d5c5d8f | 33 | #define VERSION "1.1" |
eac3731b JH |
34 | |
35 | static char iucv_userid[80]; | |
36 | ||
5708e868 | 37 | static const struct proto_ops iucv_sock_ops; |
eac3731b JH |
38 | |
39 | static struct proto iucv_proto = { | |
40 | .name = "AF_IUCV", | |
41 | .owner = THIS_MODULE, | |
42 | .obj_size = sizeof(struct iucv_sock), | |
43 | }; | |
44 | ||
b8942e3b HB |
45 | /* special AF_IUCV IPRM messages */ |
46 | static const u8 iprm_shutdown[8] = | |
47 | {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; | |
48 | ||
44b1e6b5 HB |
49 | #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) |
50 | ||
51 | /* macros to set/get socket control buffer at correct offset */ | |
52 | #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */ | |
53 | #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag)) | |
54 | #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ | |
55 | #define CB_TRGCLS_LEN (TRGCLS_SIZE) | |
56 | ||
0ea920d2 HB |
57 | #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
58 | do { \ | |
59 | DEFINE_WAIT(__wait); \ | |
60 | long __timeo = timeo; \ | |
61 | ret = 0; \ | |
aa395145 | 62 | prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
0ea920d2 | 63 | while (!(condition)) { \ |
0ea920d2 HB |
64 | if (!__timeo) { \ |
65 | ret = -EAGAIN; \ | |
66 | break; \ | |
67 | } \ | |
68 | if (signal_pending(current)) { \ | |
69 | ret = sock_intr_errno(__timeo); \ | |
70 | break; \ | |
71 | } \ | |
72 | release_sock(sk); \ | |
73 | __timeo = schedule_timeout(__timeo); \ | |
74 | lock_sock(sk); \ | |
75 | ret = sock_error(sk); \ | |
76 | if (ret) \ | |
77 | break; \ | |
78 | } \ | |
aa395145 | 79 | finish_wait(sk_sleep(sk), &__wait); \ |
0ea920d2 HB |
80 | } while (0) |
81 | ||
82 | #define iucv_sock_wait(sk, condition, timeo) \ | |
83 | ({ \ | |
84 | int __ret = 0; \ | |
85 | if (!(condition)) \ | |
86 | __iucv_sock_wait(sk, condition, timeo, __ret); \ | |
87 | __ret; \ | |
88 | }) | |
44b1e6b5 | 89 | |
57f20448 HC |
90 | static void iucv_sock_kill(struct sock *sk); |
91 | static void iucv_sock_close(struct sock *sk); | |
92 | ||
eac3731b JH |
93 | /* Call Back functions */ |
94 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
95 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
96 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
97 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
98 | u8 ipuser[16]); | |
eac3731b | 99 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 100 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
101 | |
102 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 103 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
104 | .autobind_name = ATOMIC_INIT(0) |
105 | }; | |
106 | ||
107 | static struct iucv_handler af_iucv_handler = { | |
108 | .path_pending = iucv_callback_connreq, | |
109 | .path_complete = iucv_callback_connack, | |
110 | .path_severed = iucv_callback_connrej, | |
111 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
112 | .message_complete = iucv_callback_txdone, |
113 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
114 | }; |
115 | ||
116 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
117 | { | |
118 | memcpy(dst, src, 8); | |
119 | } | |
120 | ||
121 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
122 | { | |
123 | memcpy(&dst[8], src, 8); | |
124 | } | |
125 | ||
c23cad92 UB |
126 | static int afiucv_pm_prepare(struct device *dev) |
127 | { | |
128 | #ifdef CONFIG_PM_DEBUG | |
129 | printk(KERN_WARNING "afiucv_pm_prepare\n"); | |
130 | #endif | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static void afiucv_pm_complete(struct device *dev) | |
135 | { | |
136 | #ifdef CONFIG_PM_DEBUG | |
137 | printk(KERN_WARNING "afiucv_pm_complete\n"); | |
138 | #endif | |
139 | return; | |
140 | } | |
141 | ||
142 | /** | |
143 | * afiucv_pm_freeze() - Freeze PM callback | |
144 | * @dev: AFIUCV dummy device | |
145 | * | |
146 | * Sever all established IUCV communication pathes | |
147 | */ | |
148 | static int afiucv_pm_freeze(struct device *dev) | |
149 | { | |
150 | struct iucv_sock *iucv; | |
151 | struct sock *sk; | |
152 | struct hlist_node *node; | |
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, node, &iucv_sk_list.head) { | |
160 | iucv = iucv_sk(sk); | |
161 | skb_queue_purge(&iucv->send_skb_q); | |
162 | skb_queue_purge(&iucv->backlog_skb_q); | |
163 | switch (sk->sk_state) { | |
164 | case IUCV_SEVERED: | |
165 | case IUCV_DISCONN: | |
166 | case IUCV_CLOSING: | |
167 | case IUCV_CONNECTED: | |
168 | if (iucv->path) { | |
169 | err = iucv_path_sever(iucv->path, NULL); | |
170 | iucv_path_free(iucv->path); | |
171 | iucv->path = NULL; | |
172 | } | |
173 | break; | |
174 | case IUCV_OPEN: | |
175 | case IUCV_BOUND: | |
176 | case IUCV_LISTEN: | |
177 | case IUCV_CLOSED: | |
178 | default: | |
179 | break; | |
180 | } | |
181 | } | |
182 | read_unlock(&iucv_sk_list.lock); | |
183 | return err; | |
184 | } | |
185 | ||
186 | /** | |
187 | * afiucv_pm_restore_thaw() - Thaw and restore PM callback | |
188 | * @dev: AFIUCV dummy device | |
189 | * | |
190 | * socket clean up after freeze | |
191 | */ | |
192 | static int afiucv_pm_restore_thaw(struct device *dev) | |
193 | { | |
194 | struct iucv_sock *iucv; | |
195 | struct sock *sk; | |
196 | struct hlist_node *node; | |
197 | ||
198 | #ifdef CONFIG_PM_DEBUG | |
199 | printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); | |
200 | #endif | |
201 | read_lock(&iucv_sk_list.lock); | |
202 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
203 | iucv = iucv_sk(sk); | |
204 | switch (sk->sk_state) { | |
205 | case IUCV_CONNECTED: | |
206 | sk->sk_err = EPIPE; | |
207 | sk->sk_state = IUCV_DISCONN; | |
208 | sk->sk_state_change(sk); | |
209 | break; | |
210 | case IUCV_DISCONN: | |
211 | case IUCV_SEVERED: | |
212 | case IUCV_CLOSING: | |
213 | case IUCV_LISTEN: | |
214 | case IUCV_BOUND: | |
215 | case IUCV_OPEN: | |
216 | default: | |
217 | break; | |
218 | } | |
219 | } | |
220 | read_unlock(&iucv_sk_list.lock); | |
221 | return 0; | |
222 | } | |
223 | ||
47145210 | 224 | static const struct dev_pm_ops afiucv_pm_ops = { |
c23cad92 UB |
225 | .prepare = afiucv_pm_prepare, |
226 | .complete = afiucv_pm_complete, | |
227 | .freeze = afiucv_pm_freeze, | |
228 | .thaw = afiucv_pm_restore_thaw, | |
229 | .restore = afiucv_pm_restore_thaw, | |
230 | }; | |
231 | ||
232 | static struct device_driver af_iucv_driver = { | |
233 | .owner = THIS_MODULE, | |
234 | .name = "afiucv", | |
235 | .bus = &iucv_bus, | |
236 | .pm = &afiucv_pm_ops, | |
237 | }; | |
238 | ||
239 | /* dummy device used as trigger for PM functions */ | |
240 | static struct device *af_iucv_dev; | |
241 | ||
b8942e3b HB |
242 | /** |
243 | * iucv_msg_length() - Returns the length of an iucv message. | |
244 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
245 | * | |
246 | * The function returns the length of the specified iucv message @msg of data | |
247 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
248 | * | |
249 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
250 | * data: | |
251 | * PRMDATA[0..6] socket data (max 7 bytes); | |
252 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
253 | * | |
254 | * The socket data length is computed by substracting the socket data length | |
255 | * value from 0xFF. | |
256 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
257 | * notifications (see iucv_sock_shutdown); and further, | |
258 | * if the socket data len is > 7, the function returns 8. | |
259 | * | |
260 | * Use this function to allocate socket buffers to store iucv message data. | |
261 | */ | |
262 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
263 | { | |
264 | size_t datalen; | |
265 | ||
266 | if (msg->flags & IUCV_IPRMDATA) { | |
267 | datalen = 0xff - msg->rmmsg[7]; | |
268 | return (datalen < 8) ? datalen : 8; | |
269 | } | |
270 | return msg->length; | |
271 | } | |
272 | ||
0ea920d2 HB |
273 | /** |
274 | * iucv_sock_in_state() - check for specific states | |
275 | * @sk: sock structure | |
276 | * @state: first iucv sk state | |
277 | * @state: second iucv sk state | |
278 | * | |
279 | * Returns true if the socket in either in the first or second state. | |
280 | */ | |
281 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
282 | { | |
283 | return (sk->sk_state == state || sk->sk_state == state2); | |
284 | } | |
285 | ||
286 | /** | |
287 | * iucv_below_msglim() - function to check if messages can be sent | |
288 | * @sk: sock structure | |
289 | * | |
290 | * Returns true if the send queue length is lower than the message limit. | |
291 | * Always returns true if the socket is not connected (no iucv path for | |
292 | * checking the message limit). | |
293 | */ | |
294 | static inline int iucv_below_msglim(struct sock *sk) | |
295 | { | |
296 | struct iucv_sock *iucv = iucv_sk(sk); | |
297 | ||
298 | if (sk->sk_state != IUCV_CONNECTED) | |
299 | return 1; | |
300 | return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); | |
301 | } | |
302 | ||
303 | /** | |
304 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
305 | */ | |
306 | static void iucv_sock_wake_msglim(struct sock *sk) | |
307 | { | |
43815482 ED |
308 | struct socket_wq *wq; |
309 | ||
310 | rcu_read_lock(); | |
311 | wq = rcu_dereference(sk->sk_wq); | |
312 | if (wq_has_sleeper(wq)) | |
313 | wake_up_interruptible_all(&wq->wait); | |
0ea920d2 | 314 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 315 | rcu_read_unlock(); |
0ea920d2 HB |
316 | } |
317 | ||
eac3731b JH |
318 | /* Timers */ |
319 | static void iucv_sock_timeout(unsigned long arg) | |
320 | { | |
321 | struct sock *sk = (struct sock *)arg; | |
322 | ||
323 | bh_lock_sock(sk); | |
324 | sk->sk_err = ETIMEDOUT; | |
325 | sk->sk_state_change(sk); | |
326 | bh_unlock_sock(sk); | |
327 | ||
328 | iucv_sock_kill(sk); | |
329 | sock_put(sk); | |
330 | } | |
331 | ||
332 | static void iucv_sock_clear_timer(struct sock *sk) | |
333 | { | |
334 | sk_stop_timer(sk, &sk->sk_timer); | |
335 | } | |
336 | ||
eac3731b JH |
337 | static struct sock *__iucv_get_sock_by_name(char *nm) |
338 | { | |
339 | struct sock *sk; | |
340 | struct hlist_node *node; | |
341 | ||
342 | sk_for_each(sk, node, &iucv_sk_list.head) | |
343 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
344 | return sk; | |
345 | ||
346 | return NULL; | |
347 | } | |
348 | ||
349 | static void iucv_sock_destruct(struct sock *sk) | |
350 | { | |
351 | skb_queue_purge(&sk->sk_receive_queue); | |
352 | skb_queue_purge(&sk->sk_write_queue); | |
353 | } | |
354 | ||
355 | /* Cleanup Listen */ | |
356 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
357 | { | |
358 | struct sock *sk; | |
359 | ||
360 | /* Close non-accepted connections */ | |
361 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
362 | iucv_sock_close(sk); | |
363 | iucv_sock_kill(sk); | |
364 | } | |
365 | ||
366 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
367 | } |
368 | ||
7514bab0 | 369 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
370 | static void iucv_sock_kill(struct sock *sk) |
371 | { | |
372 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
373 | return; | |
374 | ||
375 | iucv_sock_unlink(&iucv_sk_list, sk); | |
376 | sock_set_flag(sk, SOCK_DEAD); | |
377 | sock_put(sk); | |
378 | } | |
379 | ||
380 | /* Close an IUCV socket */ | |
381 | static void iucv_sock_close(struct sock *sk) | |
382 | { | |
383 | unsigned char user_data[16]; | |
384 | struct iucv_sock *iucv = iucv_sk(sk); | |
385 | int err; | |
561e0360 | 386 | unsigned long timeo; |
eac3731b JH |
387 | |
388 | iucv_sock_clear_timer(sk); | |
389 | lock_sock(sk); | |
390 | ||
da99f056 | 391 | switch (sk->sk_state) { |
eac3731b JH |
392 | case IUCV_LISTEN: |
393 | iucv_sock_cleanup_listen(sk); | |
394 | break; | |
395 | ||
396 | case IUCV_CONNECTED: | |
397 | case IUCV_DISCONN: | |
398 | err = 0; | |
561e0360 JH |
399 | |
400 | sk->sk_state = IUCV_CLOSING; | |
401 | sk->sk_state_change(sk); | |
402 | ||
da99f056 | 403 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
404 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
405 | timeo = sk->sk_lingertime; | |
406 | else | |
407 | timeo = IUCV_DISCONN_TIMEOUT; | |
0ea920d2 HB |
408 | err = iucv_sock_wait(sk, |
409 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), | |
410 | timeo); | |
561e0360 JH |
411 | } |
412 | ||
bbe188c8 | 413 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
414 | sk->sk_state = IUCV_CLOSED; |
415 | sk->sk_state_change(sk); | |
416 | ||
eac3731b JH |
417 | if (iucv->path) { |
418 | low_nmcpy(user_data, iucv->src_name); | |
419 | high_nmcpy(user_data, iucv->dst_name); | |
420 | ASCEBC(user_data, sizeof(user_data)); | |
421 | err = iucv_path_sever(iucv->path, user_data); | |
422 | iucv_path_free(iucv->path); | |
423 | iucv->path = NULL; | |
424 | } | |
425 | ||
eac3731b JH |
426 | sk->sk_err = ECONNRESET; |
427 | sk->sk_state_change(sk); | |
428 | ||
429 | skb_queue_purge(&iucv->send_skb_q); | |
561e0360 | 430 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b JH |
431 | break; |
432 | ||
433 | default: | |
7514bab0 | 434 | /* nothing to do here */ |
eac3731b | 435 | break; |
3ff50b79 | 436 | } |
eac3731b | 437 | |
7514bab0 HB |
438 | /* mark socket for deletion by iucv_sock_kill() */ |
439 | sock_set_flag(sk, SOCK_ZAPPED); | |
440 | ||
eac3731b | 441 | release_sock(sk); |
eac3731b JH |
442 | } |
443 | ||
444 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
445 | { | |
446 | if (parent) | |
447 | sk->sk_type = parent->sk_type; | |
448 | } | |
449 | ||
450 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
451 | { | |
452 | struct sock *sk; | |
453 | ||
6257ff21 | 454 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
455 | if (!sk) |
456 | return NULL; | |
457 | ||
458 | sock_init_data(sock, sk); | |
459 | INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); | |
febca281 | 460 | spin_lock_init(&iucv_sk(sk)->accept_q_lock); |
eac3731b | 461 | skb_queue_head_init(&iucv_sk(sk)->send_skb_q); |
f0703c80 UB |
462 | INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list); |
463 | spin_lock_init(&iucv_sk(sk)->message_q.lock); | |
561e0360 | 464 | skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q); |
eac3731b | 465 | iucv_sk(sk)->send_tag = 0; |
9d5c5d8f | 466 | iucv_sk(sk)->flags = 0; |
09488e2e | 467 | iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT; |
bbe188c8 UB |
468 | iucv_sk(sk)->path = NULL; |
469 | memset(&iucv_sk(sk)->src_user_id , 0, 32); | |
eac3731b JH |
470 | |
471 | sk->sk_destruct = iucv_sock_destruct; | |
472 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
473 | sk->sk_allocation = GFP_DMA; | |
474 | ||
475 | sock_reset_flag(sk, SOCK_ZAPPED); | |
476 | ||
477 | sk->sk_protocol = proto; | |
478 | sk->sk_state = IUCV_OPEN; | |
479 | ||
b24b8a24 | 480 | setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); |
eac3731b JH |
481 | |
482 | iucv_sock_link(&iucv_sk_list, sk); | |
483 | return sk; | |
484 | } | |
485 | ||
486 | /* Create an IUCV socket */ | |
3f378b68 EP |
487 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
488 | int kern) | |
eac3731b JH |
489 | { |
490 | struct sock *sk; | |
491 | ||
aa8e71f5 HB |
492 | if (protocol && protocol != PF_IUCV) |
493 | return -EPROTONOSUPPORT; | |
eac3731b JH |
494 | |
495 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
496 | |
497 | switch (sock->type) { | |
498 | case SOCK_STREAM: | |
499 | sock->ops = &iucv_sock_ops; | |
500 | break; | |
501 | case SOCK_SEQPACKET: | |
502 | /* currently, proto ops can handle both sk types */ | |
503 | sock->ops = &iucv_sock_ops; | |
504 | break; | |
505 | default: | |
506 | return -ESOCKTNOSUPPORT; | |
507 | } | |
eac3731b JH |
508 | |
509 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
510 | if (!sk) | |
511 | return -ENOMEM; | |
512 | ||
513 | iucv_sock_init(sk, NULL); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
519 | { | |
520 | write_lock_bh(&l->lock); | |
521 | sk_add_node(sk, &l->head); | |
522 | write_unlock_bh(&l->lock); | |
523 | } | |
524 | ||
525 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
526 | { | |
527 | write_lock_bh(&l->lock); | |
528 | sk_del_node_init(sk); | |
529 | write_unlock_bh(&l->lock); | |
530 | } | |
531 | ||
532 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
533 | { | |
febca281 UB |
534 | unsigned long flags; |
535 | struct iucv_sock *par = iucv_sk(parent); | |
536 | ||
eac3731b | 537 | sock_hold(sk); |
febca281 UB |
538 | spin_lock_irqsave(&par->accept_q_lock, flags); |
539 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
540 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 541 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 542 | sk_acceptq_added(parent); |
eac3731b JH |
543 | } |
544 | ||
545 | void iucv_accept_unlink(struct sock *sk) | |
546 | { | |
febca281 UB |
547 | unsigned long flags; |
548 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
549 | ||
550 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 551 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 552 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 553 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
554 | iucv_sk(sk)->parent = NULL; |
555 | sock_put(sk); | |
556 | } | |
557 | ||
558 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
559 | { | |
560 | struct iucv_sock *isk, *n; | |
561 | struct sock *sk; | |
562 | ||
da99f056 | 563 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
564 | sk = (struct sock *) isk; |
565 | lock_sock(sk); | |
566 | ||
567 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 568 | iucv_accept_unlink(sk); |
febca281 | 569 | release_sock(sk); |
eac3731b JH |
570 | continue; |
571 | } | |
572 | ||
573 | if (sk->sk_state == IUCV_CONNECTED || | |
574 | sk->sk_state == IUCV_SEVERED || | |
56a73de3 | 575 | sk->sk_state == IUCV_DISCONN || /* due to PM restore */ |
eac3731b JH |
576 | !newsock) { |
577 | iucv_accept_unlink(sk); | |
578 | if (newsock) | |
579 | sock_graft(sk, newsock); | |
580 | ||
581 | if (sk->sk_state == IUCV_SEVERED) | |
582 | sk->sk_state = IUCV_DISCONN; | |
583 | ||
584 | release_sock(sk); | |
585 | return sk; | |
586 | } | |
587 | ||
588 | release_sock(sk); | |
589 | } | |
590 | return NULL; | |
591 | } | |
592 | ||
eac3731b JH |
593 | /* Bind an unbound socket */ |
594 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
595 | int addr_len) | |
596 | { | |
597 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
598 | struct sock *sk = sock->sk; | |
599 | struct iucv_sock *iucv; | |
600 | int err; | |
601 | ||
602 | /* Verify the input sockaddr */ | |
603 | if (!addr || addr->sa_family != AF_IUCV) | |
604 | return -EINVAL; | |
605 | ||
606 | lock_sock(sk); | |
607 | if (sk->sk_state != IUCV_OPEN) { | |
608 | err = -EBADFD; | |
609 | goto done; | |
610 | } | |
611 | ||
612 | write_lock_bh(&iucv_sk_list.lock); | |
613 | ||
614 | iucv = iucv_sk(sk); | |
615 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
616 | err = -EADDRINUSE; | |
617 | goto done_unlock; | |
618 | } | |
619 | if (iucv->path) { | |
620 | err = 0; | |
621 | goto done_unlock; | |
622 | } | |
623 | ||
624 | /* Bind the socket */ | |
625 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
626 | ||
627 | /* Copy the user id */ | |
628 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
629 | sk->sk_state = IUCV_BOUND; | |
630 | err = 0; | |
631 | ||
632 | done_unlock: | |
633 | /* Release the socket list lock */ | |
634 | write_unlock_bh(&iucv_sk_list.lock); | |
635 | done: | |
636 | release_sock(sk); | |
637 | return err; | |
638 | } | |
639 | ||
640 | /* Automatically bind an unbound socket */ | |
641 | static int iucv_sock_autobind(struct sock *sk) | |
642 | { | |
643 | struct iucv_sock *iucv = iucv_sk(sk); | |
644 | char query_buffer[80]; | |
645 | char name[12]; | |
646 | int err = 0; | |
647 | ||
648 | /* Set the userid and name */ | |
649 | cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); | |
650 | if (unlikely(err)) | |
651 | return -EPROTO; | |
652 | ||
653 | memcpy(iucv->src_user_id, query_buffer, 8); | |
654 | ||
655 | write_lock_bh(&iucv_sk_list.lock); | |
656 | ||
657 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
658 | while (__iucv_get_sock_by_name(name)) { | |
659 | sprintf(name, "%08x", | |
660 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
661 | } | |
662 | ||
663 | write_unlock_bh(&iucv_sk_list.lock); | |
664 | ||
665 | memcpy(&iucv->src_name, name, 8); | |
666 | ||
667 | return err; | |
668 | } | |
669 | ||
670 | /* Connect an unconnected socket */ | |
671 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
672 | int alen, int flags) | |
673 | { | |
674 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
675 | struct sock *sk = sock->sk; | |
676 | struct iucv_sock *iucv; | |
677 | unsigned char user_data[16]; | |
678 | int err; | |
679 | ||
680 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
681 | return -EINVAL; | |
682 | ||
683 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
684 | return -EBADFD; | |
685 | ||
aa8e71f5 | 686 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) |
eac3731b JH |
687 | return -EINVAL; |
688 | ||
eac3731b JH |
689 | if (sk->sk_state == IUCV_OPEN) { |
690 | err = iucv_sock_autobind(sk); | |
691 | if (unlikely(err)) | |
692 | return err; | |
693 | } | |
694 | ||
695 | lock_sock(sk); | |
696 | ||
697 | /* Set the destination information */ | |
698 | memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); | |
699 | memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); | |
700 | ||
701 | high_nmcpy(user_data, sa->siucv_name); | |
702 | low_nmcpy(user_data, iucv_sk(sk)->src_name); | |
703 | ASCEBC(user_data, sizeof(user_data)); | |
704 | ||
705 | iucv = iucv_sk(sk); | |
706 | /* Create path. */ | |
09488e2e | 707 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 708 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
709 | if (!iucv->path) { |
710 | err = -ENOMEM; | |
711 | goto done; | |
712 | } | |
eac3731b JH |
713 | err = iucv_path_connect(iucv->path, &af_iucv_handler, |
714 | sa->siucv_user_id, NULL, user_data, sk); | |
715 | if (err) { | |
716 | iucv_path_free(iucv->path); | |
717 | iucv->path = NULL; | |
55cdea9e HB |
718 | switch (err) { |
719 | case 0x0b: /* Target communicator is not logged on */ | |
720 | err = -ENETUNREACH; | |
721 | break; | |
722 | case 0x0d: /* Max connections for this guest exceeded */ | |
723 | case 0x0e: /* Max connections for target guest exceeded */ | |
724 | err = -EAGAIN; | |
725 | break; | |
726 | case 0x0f: /* Missing IUCV authorization */ | |
727 | err = -EACCES; | |
728 | break; | |
729 | default: | |
730 | err = -ECONNREFUSED; | |
731 | break; | |
732 | } | |
eac3731b JH |
733 | goto done; |
734 | } | |
735 | ||
736 | if (sk->sk_state != IUCV_CONNECTED) { | |
0ea920d2 HB |
737 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
738 | IUCV_DISCONN), | |
739 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b JH |
740 | } |
741 | ||
742 | if (sk->sk_state == IUCV_DISCONN) { | |
b8942e3b | 743 | err = -ECONNREFUSED; |
eac3731b | 744 | } |
18becbc5 UB |
745 | |
746 | if (err) { | |
747 | iucv_path_sever(iucv->path, NULL); | |
748 | iucv_path_free(iucv->path); | |
749 | iucv->path = NULL; | |
750 | } | |
751 | ||
eac3731b JH |
752 | done: |
753 | release_sock(sk); | |
754 | return err; | |
755 | } | |
756 | ||
757 | /* Move a socket into listening state. */ | |
758 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
759 | { | |
760 | struct sock *sk = sock->sk; | |
761 | int err; | |
762 | ||
763 | lock_sock(sk); | |
764 | ||
765 | err = -EINVAL; | |
aa8e71f5 HB |
766 | if (sk->sk_state != IUCV_BOUND) |
767 | goto done; | |
768 | ||
769 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
770 | goto done; |
771 | ||
772 | sk->sk_max_ack_backlog = backlog; | |
773 | sk->sk_ack_backlog = 0; | |
774 | sk->sk_state = IUCV_LISTEN; | |
775 | err = 0; | |
776 | ||
777 | done: | |
778 | release_sock(sk); | |
779 | return err; | |
780 | } | |
781 | ||
782 | /* Accept a pending connection */ | |
783 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
784 | int flags) | |
785 | { | |
786 | DECLARE_WAITQUEUE(wait, current); | |
787 | struct sock *sk = sock->sk, *nsk; | |
788 | long timeo; | |
789 | int err = 0; | |
790 | ||
561e0360 | 791 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
792 | |
793 | if (sk->sk_state != IUCV_LISTEN) { | |
794 | err = -EBADFD; | |
795 | goto done; | |
796 | } | |
797 | ||
798 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
799 | ||
800 | /* Wait for an incoming connection */ | |
aa395145 | 801 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 802 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
803 | set_current_state(TASK_INTERRUPTIBLE); |
804 | if (!timeo) { | |
805 | err = -EAGAIN; | |
806 | break; | |
807 | } | |
808 | ||
809 | release_sock(sk); | |
810 | timeo = schedule_timeout(timeo); | |
561e0360 | 811 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
812 | |
813 | if (sk->sk_state != IUCV_LISTEN) { | |
814 | err = -EBADFD; | |
815 | break; | |
816 | } | |
817 | ||
818 | if (signal_pending(current)) { | |
819 | err = sock_intr_errno(timeo); | |
820 | break; | |
821 | } | |
822 | } | |
823 | ||
824 | set_current_state(TASK_RUNNING); | |
aa395145 | 825 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
826 | |
827 | if (err) | |
828 | goto done; | |
829 | ||
830 | newsock->state = SS_CONNECTED; | |
831 | ||
832 | done: | |
833 | release_sock(sk); | |
834 | return err; | |
835 | } | |
836 | ||
837 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
838 | int *len, int peer) | |
839 | { | |
840 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
841 | struct sock *sk = sock->sk; | |
842 | ||
843 | addr->sa_family = AF_IUCV; | |
844 | *len = sizeof(struct sockaddr_iucv); | |
845 | ||
846 | if (peer) { | |
847 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); | |
848 | memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); | |
849 | } else { | |
850 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8); | |
851 | memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); | |
852 | } | |
853 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
854 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
855 | memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); | |
856 | ||
857 | return 0; | |
858 | } | |
859 | ||
b8942e3b HB |
860 | /** |
861 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
862 | * @path: IUCV path | |
863 | * @msg: Pointer to a struct iucv_message | |
864 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
865 | * | |
866 | * Send the socket data in the parameter list in the iucv message | |
867 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
868 | * list and the socket data len at index 7 (last byte). | |
869 | * See also iucv_msg_length(). | |
870 | * | |
871 | * Returns the error code from the iucv_message_send() call. | |
872 | */ | |
873 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
874 | struct sk_buff *skb) | |
875 | { | |
876 | u8 prmdata[8]; | |
877 | ||
878 | memcpy(prmdata, (void *) skb->data, skb->len); | |
879 | prmdata[7] = 0xff - (u8) skb->len; | |
880 | return iucv_message_send(path, msg, IUCV_IPRMDATA, 0, | |
881 | (void *) prmdata, 8); | |
882 | } | |
883 | ||
eac3731b JH |
884 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
885 | struct msghdr *msg, size_t len) | |
886 | { | |
887 | struct sock *sk = sock->sk; | |
888 | struct iucv_sock *iucv = iucv_sk(sk); | |
889 | struct sk_buff *skb; | |
890 | struct iucv_message txmsg; | |
44b1e6b5 HB |
891 | struct cmsghdr *cmsg; |
892 | int cmsg_done; | |
0ea920d2 | 893 | long timeo; |
8f7c502c UB |
894 | char user_id[9]; |
895 | char appl_id[9]; | |
eac3731b | 896 | int err; |
0ea920d2 | 897 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
898 | |
899 | err = sock_error(sk); | |
900 | if (err) | |
901 | return err; | |
902 | ||
903 | if (msg->msg_flags & MSG_OOB) | |
904 | return -EOPNOTSUPP; | |
905 | ||
aa8e71f5 HB |
906 | /* SOCK_SEQPACKET: we do not support segmented records */ |
907 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
908 | return -EOPNOTSUPP; | |
909 | ||
eac3731b JH |
910 | lock_sock(sk); |
911 | ||
912 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
913 | err = -EPIPE; | |
914 | goto out; | |
915 | } | |
916 | ||
bb664f49 HB |
917 | /* Return if the socket is not in connected state */ |
918 | if (sk->sk_state != IUCV_CONNECTED) { | |
919 | err = -ENOTCONN; | |
920 | goto out; | |
921 | } | |
44b1e6b5 | 922 | |
bb664f49 HB |
923 | /* initialize defaults */ |
924 | cmsg_done = 0; /* check for duplicate headers */ | |
925 | txmsg.class = 0; | |
44b1e6b5 | 926 | |
bb664f49 HB |
927 | /* iterate over control messages */ |
928 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; | |
929 | cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
44b1e6b5 | 930 | |
bb664f49 HB |
931 | if (!CMSG_OK(msg, cmsg)) { |
932 | err = -EINVAL; | |
933 | goto out; | |
934 | } | |
44b1e6b5 | 935 | |
bb664f49 HB |
936 | if (cmsg->cmsg_level != SOL_IUCV) |
937 | continue; | |
44b1e6b5 | 938 | |
bb664f49 HB |
939 | if (cmsg->cmsg_type & cmsg_done) { |
940 | err = -EINVAL; | |
941 | goto out; | |
942 | } | |
943 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 944 | |
bb664f49 HB |
945 | switch (cmsg->cmsg_type) { |
946 | case SCM_IUCV_TRGCLS: | |
947 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
948 | err = -EINVAL; |
949 | goto out; | |
950 | } | |
44b1e6b5 | 951 | |
bb664f49 HB |
952 | /* set iucv message target class */ |
953 | memcpy(&txmsg.class, | |
954 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 955 | |
bb664f49 | 956 | break; |
44b1e6b5 | 957 | |
bb664f49 HB |
958 | default: |
959 | err = -EINVAL; | |
960 | goto out; | |
961 | break; | |
44b1e6b5 | 962 | } |
bb664f49 | 963 | } |
44b1e6b5 | 964 | |
bb664f49 HB |
965 | /* allocate one skb for each iucv message: |
966 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
967 | * segmented records using the MSG_EOR flag), but | |
968 | * for SOCK_STREAM we might want to improve it in future */ | |
0ea920d2 | 969 | skb = sock_alloc_send_skb(sk, len, noblock, &err); |
bb664f49 HB |
970 | if (!skb) |
971 | goto out; | |
972 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { | |
973 | err = -EFAULT; | |
974 | goto fail; | |
975 | } | |
eac3731b | 976 | |
0ea920d2 HB |
977 | /* wait if outstanding messages for iucv path has reached */ |
978 | timeo = sock_sndtimeo(sk, noblock); | |
979 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
980 | if (err) | |
981 | goto fail; | |
eac3731b | 982 | |
0ea920d2 HB |
983 | /* return -ECONNRESET if the socket is no longer connected */ |
984 | if (sk->sk_state != IUCV_CONNECTED) { | |
985 | err = -ECONNRESET; | |
986 | goto fail; | |
987 | } | |
b8942e3b | 988 | |
bb664f49 HB |
989 | /* increment and save iucv message tag for msg_completion cbk */ |
990 | txmsg.tag = iucv->send_tag++; | |
991 | memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); | |
992 | skb_queue_tail(&iucv->send_skb_q, skb); | |
b8942e3b | 993 | |
bb664f49 HB |
994 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
995 | && skb->len <= 7) { | |
996 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 997 | |
bb664f49 HB |
998 | /* on success: there is no message_complete callback |
999 | * for an IPRMDATA msg; remove skb from send queue */ | |
1000 | if (err == 0) { | |
1001 | skb_unlink(skb, &iucv->send_skb_q); | |
1002 | kfree_skb(skb); | |
1003 | } | |
1004 | ||
1005 | /* this error should never happen since the | |
1006 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1007 | if (err == 0x15) { | |
1008 | iucv_path_sever(iucv->path, NULL); | |
eac3731b JH |
1009 | skb_unlink(skb, &iucv->send_skb_q); |
1010 | err = -EPIPE; | |
1011 | goto fail; | |
1012 | } | |
bb664f49 HB |
1013 | } else |
1014 | err = iucv_message_send(iucv->path, &txmsg, 0, 0, | |
1015 | (void *) skb->data, skb->len); | |
1016 | if (err) { | |
1017 | if (err == 3) { | |
1018 | user_id[8] = 0; | |
1019 | memcpy(user_id, iucv->dst_user_id, 8); | |
1020 | appl_id[8] = 0; | |
1021 | memcpy(appl_id, iucv->dst_name, 8); | |
1022 | pr_err("Application %s on z/VM guest %s" | |
1023 | " exceeds message limit\n", | |
1024 | appl_id, user_id); | |
0ea920d2 HB |
1025 | err = -EAGAIN; |
1026 | } else | |
1027 | err = -EPIPE; | |
bb664f49 | 1028 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1029 | goto fail; |
eac3731b JH |
1030 | } |
1031 | ||
1032 | release_sock(sk); | |
1033 | return len; | |
1034 | ||
1035 | fail: | |
1036 | kfree_skb(skb); | |
1037 | out: | |
1038 | release_sock(sk); | |
1039 | return err; | |
1040 | } | |
1041 | ||
bf95d20f HB |
1042 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1043 | * | |
1044 | * Locking: must be called with message_q.lock held | |
1045 | */ | |
f0703c80 UB |
1046 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1047 | { | |
1048 | int dataleft, size, copied = 0; | |
1049 | struct sk_buff *nskb; | |
1050 | ||
1051 | dataleft = len; | |
1052 | while (dataleft) { | |
1053 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1054 | size = sk->sk_rcvbuf / 4; | |
1055 | else | |
1056 | size = dataleft; | |
1057 | ||
1058 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1059 | if (!nskb) | |
1060 | return -ENOMEM; | |
1061 | ||
44b1e6b5 HB |
1062 | /* copy target class to control buffer of new skb */ |
1063 | memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); | |
1064 | ||
1065 | /* copy data fragment */ | |
f0703c80 UB |
1066 | memcpy(nskb->data, skb->data + copied, size); |
1067 | copied += size; | |
1068 | dataleft -= size; | |
1069 | ||
1070 | skb_reset_transport_header(nskb); | |
1071 | skb_reset_network_header(nskb); | |
1072 | nskb->len = size; | |
1073 | ||
1074 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1075 | } | |
1076 | ||
1077 | return 0; | |
1078 | } | |
1079 | ||
bf95d20f HB |
1080 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1081 | * | |
1082 | * Locking: must be called with message_q.lock held | |
1083 | */ | |
f0703c80 UB |
1084 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1085 | struct iucv_path *path, | |
1086 | struct iucv_message *msg) | |
1087 | { | |
1088 | int rc; | |
b8942e3b HB |
1089 | unsigned int len; |
1090 | ||
1091 | len = iucv_msg_length(msg); | |
f0703c80 | 1092 | |
44b1e6b5 HB |
1093 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1094 | /* Note: the first 4 bytes are reserved for msg tag */ | |
1095 | memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); | |
1096 | ||
b8942e3b HB |
1097 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1098 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1099 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1100 | skb->data = NULL; | |
1101 | skb->len = 0; | |
1102 | } | |
f0703c80 | 1103 | } else { |
b8942e3b HB |
1104 | rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA, |
1105 | skb->data, len, NULL); | |
f0703c80 UB |
1106 | if (rc) { |
1107 | kfree_skb(skb); | |
1108 | return; | |
1109 | } | |
aa8e71f5 HB |
1110 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1111 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1112 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1113 | if (sk->sk_type == SOCK_STREAM && | |
1114 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1115 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1116 | kfree_skb(skb); |
1117 | skb = NULL; | |
1118 | if (rc) { | |
1119 | iucv_path_sever(path, NULL); | |
1120 | return; | |
1121 | } | |
1122 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1123 | } else { | |
1124 | skb_reset_transport_header(skb); | |
1125 | skb_reset_network_header(skb); | |
b8942e3b | 1126 | skb->len = len; |
f0703c80 UB |
1127 | } |
1128 | } | |
1129 | ||
1130 | if (sock_queue_rcv_skb(sk, skb)) | |
1131 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1132 | } | |
1133 | ||
bf95d20f HB |
1134 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1135 | * | |
1136 | * Locking: must be called with message_q.lock held | |
1137 | */ | |
f0703c80 UB |
1138 | static void iucv_process_message_q(struct sock *sk) |
1139 | { | |
1140 | struct iucv_sock *iucv = iucv_sk(sk); | |
1141 | struct sk_buff *skb; | |
1142 | struct sock_msg_q *p, *n; | |
1143 | ||
1144 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1145 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1146 | if (!skb) |
1147 | break; | |
1148 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1149 | list_del(&p->list); | |
1150 | kfree(p); | |
1151 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1152 | break; | |
1153 | } | |
1154 | } | |
1155 | ||
eac3731b JH |
1156 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1157 | struct msghdr *msg, size_t len, int flags) | |
1158 | { | |
1159 | int noblock = flags & MSG_DONTWAIT; | |
1160 | struct sock *sk = sock->sk; | |
561e0360 | 1161 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1162 | unsigned int copied, rlen; |
561e0360 | 1163 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b JH |
1164 | int err = 0; |
1165 | ||
561e0360 | 1166 | if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && |
f0703c80 UB |
1167 | skb_queue_empty(&iucv->backlog_skb_q) && |
1168 | skb_queue_empty(&sk->sk_receive_queue) && | |
1169 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1170 | return 0; |
1171 | ||
eac3731b JH |
1172 | if (flags & (MSG_OOB)) |
1173 | return -EOPNOTSUPP; | |
1174 | ||
60d3705f HB |
1175 | /* receive/dequeue next skb: |
1176 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1177 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1178 | if (!skb) { | |
1179 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1180 | return 0; | |
1181 | return err; | |
1182 | } | |
1183 | ||
aa8e71f5 HB |
1184 | rlen = skb->len; /* real length of skb */ |
1185 | copied = min_t(unsigned int, rlen, len); | |
eac3731b | 1186 | |
561e0360 JH |
1187 | cskb = skb; |
1188 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
802788bf HB |
1189 | if (!(flags & MSG_PEEK)) |
1190 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1191 | return -EFAULT; | |
eac3731b JH |
1192 | } |
1193 | ||
aa8e71f5 HB |
1194 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1195 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1196 | if (copied < rlen) | |
1197 | msg->msg_flags |= MSG_TRUNC; | |
1198 | /* each iucv message contains a complete record */ | |
1199 | msg->msg_flags |= MSG_EOR; | |
1200 | } | |
eac3731b | 1201 | |
44b1e6b5 HB |
1202 | /* create control message to store iucv msg target class: |
1203 | * get the trgcls from the control buffer of the skb due to | |
1204 | * fragmentation of original iucv message. */ | |
1205 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
1206 | CB_TRGCLS_LEN, CB_TRGCLS(skb)); | |
1207 | if (err) { | |
1208 | if (!(flags & MSG_PEEK)) | |
1209 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1210 | return err; | |
1211 | } | |
1212 | ||
eac3731b JH |
1213 | /* Mark read part of skb as used */ |
1214 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1215 | |
aa8e71f5 HB |
1216 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1217 | if (sk->sk_type == SOCK_STREAM) { | |
1218 | skb_pull(skb, copied); | |
1219 | if (skb->len) { | |
1220 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1221 | goto done; | |
1222 | } | |
eac3731b JH |
1223 | } |
1224 | ||
1225 | kfree_skb(skb); | |
561e0360 JH |
1226 | |
1227 | /* Queue backlog skbs */ | |
bf95d20f | 1228 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1229 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1230 | while (rskb) { |
561e0360 | 1231 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1232 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1233 | rskb); |
1234 | break; | |
1235 | } else { | |
f0703c80 | 1236 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1237 | } |
1238 | } | |
f0703c80 | 1239 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1240 | if (!list_empty(&iucv->message_q.list)) |
1241 | iucv_process_message_q(sk); | |
f0703c80 | 1242 | } |
bf95d20f | 1243 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1244 | } |
eac3731b JH |
1245 | |
1246 | done: | |
aa8e71f5 HB |
1247 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1248 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1249 | copied = rlen; | |
1250 | ||
1251 | return copied; | |
eac3731b JH |
1252 | } |
1253 | ||
1254 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1255 | { | |
1256 | struct iucv_sock *isk, *n; | |
1257 | struct sock *sk; | |
1258 | ||
da99f056 | 1259 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1260 | sk = (struct sock *) isk; |
1261 | ||
1262 | if (sk->sk_state == IUCV_CONNECTED) | |
1263 | return POLLIN | POLLRDNORM; | |
1264 | } | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
1269 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1270 | poll_table *wait) | |
1271 | { | |
1272 | struct sock *sk = sock->sk; | |
1273 | unsigned int mask = 0; | |
1274 | ||
aa395145 | 1275 | sock_poll_wait(file, sk_sleep(sk), wait); |
eac3731b JH |
1276 | |
1277 | if (sk->sk_state == IUCV_LISTEN) | |
1278 | return iucv_accept_poll(sk); | |
1279 | ||
1280 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
1281 | mask |= POLLERR; | |
1282 | ||
1283 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1284 | mask |= POLLRDHUP; | |
1285 | ||
1286 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1287 | mask |= POLLHUP; | |
1288 | ||
1289 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1290 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1291 | mask |= POLLIN | POLLRDNORM; |
1292 | ||
1293 | if (sk->sk_state == IUCV_CLOSED) | |
1294 | mask |= POLLHUP; | |
1295 | ||
561e0360 JH |
1296 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) |
1297 | mask |= POLLIN; | |
1298 | ||
eac3731b JH |
1299 | if (sock_writeable(sk)) |
1300 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1301 | else | |
1302 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1303 | ||
1304 | return mask; | |
1305 | } | |
1306 | ||
1307 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1308 | { | |
1309 | struct sock *sk = sock->sk; | |
1310 | struct iucv_sock *iucv = iucv_sk(sk); | |
1311 | struct iucv_message txmsg; | |
1312 | int err = 0; | |
eac3731b JH |
1313 | |
1314 | how++; | |
1315 | ||
1316 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | lock_sock(sk); | |
da99f056 | 1320 | switch (sk->sk_state) { |
e14ad5fa HB |
1321 | case IUCV_DISCONN: |
1322 | case IUCV_CLOSING: | |
1323 | case IUCV_SEVERED: | |
eac3731b JH |
1324 | case IUCV_CLOSED: |
1325 | err = -ENOTCONN; | |
1326 | goto fail; | |
1327 | ||
1328 | default: | |
1329 | sk->sk_shutdown |= how; | |
1330 | break; | |
1331 | } | |
1332 | ||
1333 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1334 | txmsg.class = 0; | |
1335 | txmsg.tag = 0; | |
1336 | err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, | |
b8942e3b | 1337 | (void *) iprm_shutdown, 8); |
eac3731b | 1338 | if (err) { |
da99f056 | 1339 | switch (err) { |
eac3731b JH |
1340 | case 1: |
1341 | err = -ENOTCONN; | |
1342 | break; | |
1343 | case 2: | |
1344 | err = -ECONNRESET; | |
1345 | break; | |
1346 | default: | |
1347 | err = -ENOTCONN; | |
1348 | break; | |
1349 | } | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1354 | err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); | |
1355 | if (err) | |
1356 | err = -ENOTCONN; | |
1357 | ||
1358 | skb_queue_purge(&sk->sk_receive_queue); | |
1359 | } | |
1360 | ||
1361 | /* Wake up anyone sleeping in poll */ | |
1362 | sk->sk_state_change(sk); | |
1363 | ||
1364 | fail: | |
1365 | release_sock(sk); | |
1366 | return err; | |
1367 | } | |
1368 | ||
1369 | static int iucv_sock_release(struct socket *sock) | |
1370 | { | |
1371 | struct sock *sk = sock->sk; | |
1372 | int err = 0; | |
1373 | ||
1374 | if (!sk) | |
1375 | return 0; | |
1376 | ||
1377 | iucv_sock_close(sk); | |
1378 | ||
1379 | /* Unregister with IUCV base support */ | |
1380 | if (iucv_sk(sk)->path) { | |
1381 | iucv_path_sever(iucv_sk(sk)->path, NULL); | |
1382 | iucv_path_free(iucv_sk(sk)->path); | |
1383 | iucv_sk(sk)->path = NULL; | |
1384 | } | |
1385 | ||
eac3731b JH |
1386 | sock_orphan(sk); |
1387 | iucv_sock_kill(sk); | |
1388 | return err; | |
1389 | } | |
1390 | ||
9d5c5d8f HB |
1391 | /* getsockopt and setsockopt */ |
1392 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1393 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1394 | { |
1395 | struct sock *sk = sock->sk; | |
1396 | struct iucv_sock *iucv = iucv_sk(sk); | |
1397 | int val; | |
1398 | int rc; | |
1399 | ||
1400 | if (level != SOL_IUCV) | |
1401 | return -ENOPROTOOPT; | |
1402 | ||
1403 | if (optlen < sizeof(int)) | |
1404 | return -EINVAL; | |
1405 | ||
1406 | if (get_user(val, (int __user *) optval)) | |
1407 | return -EFAULT; | |
1408 | ||
1409 | rc = 0; | |
1410 | ||
1411 | lock_sock(sk); | |
1412 | switch (optname) { | |
1413 | case SO_IPRMDATA_MSG: | |
1414 | if (val) | |
1415 | iucv->flags |= IUCV_IPRMDATA; | |
1416 | else | |
1417 | iucv->flags &= ~IUCV_IPRMDATA; | |
1418 | break; | |
09488e2e HB |
1419 | case SO_MSGLIMIT: |
1420 | switch (sk->sk_state) { | |
1421 | case IUCV_OPEN: | |
1422 | case IUCV_BOUND: | |
1423 | if (val < 1 || val > (u16)(~0)) | |
1424 | rc = -EINVAL; | |
1425 | else | |
1426 | iucv->msglimit = val; | |
1427 | break; | |
1428 | default: | |
1429 | rc = -EINVAL; | |
1430 | break; | |
1431 | } | |
1432 | break; | |
9d5c5d8f HB |
1433 | default: |
1434 | rc = -ENOPROTOOPT; | |
1435 | break; | |
1436 | } | |
1437 | release_sock(sk); | |
1438 | ||
1439 | return rc; | |
1440 | } | |
1441 | ||
1442 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1443 | char __user *optval, int __user *optlen) | |
1444 | { | |
1445 | struct sock *sk = sock->sk; | |
1446 | struct iucv_sock *iucv = iucv_sk(sk); | |
1447 | int val, len; | |
1448 | ||
1449 | if (level != SOL_IUCV) | |
1450 | return -ENOPROTOOPT; | |
1451 | ||
1452 | if (get_user(len, optlen)) | |
1453 | return -EFAULT; | |
1454 | ||
1455 | if (len < 0) | |
1456 | return -EINVAL; | |
1457 | ||
1458 | len = min_t(unsigned int, len, sizeof(int)); | |
1459 | ||
1460 | switch (optname) { | |
1461 | case SO_IPRMDATA_MSG: | |
1462 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1463 | break; | |
09488e2e HB |
1464 | case SO_MSGLIMIT: |
1465 | lock_sock(sk); | |
1466 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1467 | : iucv->msglimit; /* default */ | |
1468 | release_sock(sk); | |
1469 | break; | |
9d5c5d8f HB |
1470 | default: |
1471 | return -ENOPROTOOPT; | |
1472 | } | |
1473 | ||
1474 | if (put_user(len, optlen)) | |
1475 | return -EFAULT; | |
1476 | if (copy_to_user(optval, &val, len)) | |
1477 | return -EFAULT; | |
1478 | ||
1479 | return 0; | |
1480 | } | |
1481 | ||
1482 | ||
eac3731b JH |
1483 | /* Callback wrappers - called from iucv base support */ |
1484 | static int iucv_callback_connreq(struct iucv_path *path, | |
1485 | u8 ipvmid[8], u8 ipuser[16]) | |
1486 | { | |
1487 | unsigned char user_data[16]; | |
1488 | unsigned char nuser_data[16]; | |
1489 | unsigned char src_name[8]; | |
1490 | struct hlist_node *node; | |
1491 | struct sock *sk, *nsk; | |
1492 | struct iucv_sock *iucv, *niucv; | |
1493 | int err; | |
1494 | ||
1495 | memcpy(src_name, ipuser, 8); | |
1496 | EBCASC(src_name, 8); | |
1497 | /* Find out if this path belongs to af_iucv. */ | |
1498 | read_lock(&iucv_sk_list.lock); | |
1499 | iucv = NULL; | |
febca281 | 1500 | sk = NULL; |
eac3731b JH |
1501 | sk_for_each(sk, node, &iucv_sk_list.head) |
1502 | if (sk->sk_state == IUCV_LISTEN && | |
1503 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1504 | /* | |
1505 | * Found a listening socket with | |
1506 | * src_name == ipuser[0-7]. | |
1507 | */ | |
1508 | iucv = iucv_sk(sk); | |
1509 | break; | |
1510 | } | |
1511 | read_unlock(&iucv_sk_list.lock); | |
1512 | if (!iucv) | |
1513 | /* No socket found, not one of our paths. */ | |
1514 | return -EINVAL; | |
1515 | ||
1516 | bh_lock_sock(sk); | |
1517 | ||
1518 | /* Check if parent socket is listening */ | |
1519 | low_nmcpy(user_data, iucv->src_name); | |
1520 | high_nmcpy(user_data, iucv->dst_name); | |
1521 | ASCEBC(user_data, sizeof(user_data)); | |
1522 | if (sk->sk_state != IUCV_LISTEN) { | |
1523 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1524 | iucv_path_free(path); |
eac3731b JH |
1525 | goto fail; |
1526 | } | |
1527 | ||
1528 | /* Check for backlog size */ | |
1529 | if (sk_acceptq_is_full(sk)) { | |
1530 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1531 | iucv_path_free(path); |
eac3731b JH |
1532 | goto fail; |
1533 | } | |
1534 | ||
1535 | /* Create the new socket */ | |
aa8e71f5 | 1536 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
da99f056 | 1537 | if (!nsk) { |
eac3731b | 1538 | err = iucv_path_sever(path, user_data); |
65dbd7c2 | 1539 | iucv_path_free(path); |
eac3731b JH |
1540 | goto fail; |
1541 | } | |
1542 | ||
1543 | niucv = iucv_sk(nsk); | |
1544 | iucv_sock_init(nsk, sk); | |
1545 | ||
1546 | /* Set the new iucv_sock */ | |
1547 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1548 | EBCASC(niucv->dst_name, 8); | |
1549 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1550 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1551 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1552 | niucv->path = path; | |
1553 | ||
1554 | /* Call iucv_accept */ | |
1555 | high_nmcpy(nuser_data, ipuser + 8); | |
1556 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1557 | ASCEBC(nuser_data + 8, 8); | |
1558 | ||
09488e2e HB |
1559 | /* set message limit for path based on msglimit of accepting socket */ |
1560 | niucv->msglimit = iucv->msglimit; | |
1561 | path->msglim = iucv->msglimit; | |
eac3731b | 1562 | err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1563 | if (err) { |
eac3731b | 1564 | err = iucv_path_sever(path, user_data); |
65dbd7c2 HB |
1565 | iucv_path_free(path); |
1566 | iucv_sock_kill(nsk); | |
eac3731b JH |
1567 | goto fail; |
1568 | } | |
1569 | ||
1570 | iucv_accept_enqueue(sk, nsk); | |
1571 | ||
1572 | /* Wake up accept */ | |
1573 | nsk->sk_state = IUCV_CONNECTED; | |
1574 | sk->sk_data_ready(sk, 1); | |
1575 | err = 0; | |
1576 | fail: | |
1577 | bh_unlock_sock(sk); | |
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1582 | { | |
1583 | struct sock *sk = path->private; | |
1584 | ||
1585 | sk->sk_state = IUCV_CONNECTED; | |
1586 | sk->sk_state_change(sk); | |
1587 | } | |
1588 | ||
1589 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1590 | { | |
1591 | struct sock *sk = path->private; | |
561e0360 | 1592 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1593 | struct sk_buff *skb; |
1594 | struct sock_msg_q *save_msg; | |
1595 | int len; | |
561e0360 | 1596 | |
fe86e54e HB |
1597 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
1598 | iucv_message_reject(path, msg); | |
eac3731b | 1599 | return; |
fe86e54e | 1600 | } |
eac3731b | 1601 | |
3fa6b5ad | 1602 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1603 | |
f0703c80 UB |
1604 | if (!list_empty(&iucv->message_q.list) || |
1605 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1606 | goto save_message; | |
1607 | ||
1608 | len = atomic_read(&sk->sk_rmem_alloc); | |
b8942e3b | 1609 | len += iucv_msg_length(msg) + sizeof(struct sk_buff); |
f0703c80 UB |
1610 | if (len > sk->sk_rcvbuf) |
1611 | goto save_message; | |
1612 | ||
b8942e3b | 1613 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1614 | if (!skb) |
1615 | goto save_message; | |
eac3731b | 1616 | |
f0703c80 | 1617 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1618 | goto out_unlock; |
eac3731b | 1619 | |
f0703c80 UB |
1620 | save_message: |
1621 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 UB |
1622 | if (!save_msg) |
1623 | return; | |
f0703c80 UB |
1624 | save_msg->path = path; |
1625 | save_msg->msg = *msg; | |
eac3731b | 1626 | |
f0703c80 | 1627 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1628 | |
1629 | out_unlock: | |
f0703c80 | 1630 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1631 | } |
1632 | ||
1633 | static void iucv_callback_txdone(struct iucv_path *path, | |
1634 | struct iucv_message *msg) | |
1635 | { | |
1636 | struct sock *sk = path->private; | |
f2a77991 | 1637 | struct sk_buff *this = NULL; |
eac3731b JH |
1638 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1639 | struct sk_buff *list_skb = list->next; | |
1640 | unsigned long flags; | |
1641 | ||
f2a77991 | 1642 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1643 | spin_lock_irqsave(&list->lock, flags); |
1644 | ||
f2a77991 | 1645 | while (list_skb != (struct sk_buff *)list) { |
44b1e6b5 | 1646 | if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { |
f2a77991 UB |
1647 | this = list_skb; |
1648 | break; | |
1649 | } | |
561e0360 | 1650 | list_skb = list_skb->next; |
f2a77991 UB |
1651 | } |
1652 | if (this) | |
1653 | __skb_unlink(this, list); | |
561e0360 JH |
1654 | |
1655 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1656 | |
0ea920d2 HB |
1657 | if (this) { |
1658 | kfree_skb(this); | |
1659 | /* wake up any process waiting for sending */ | |
1660 | iucv_sock_wake_msglim(sk); | |
1661 | } | |
561e0360 | 1662 | } |
c2b4afd2 | 1663 | BUG_ON(!this); |
eac3731b | 1664 | |
da99f056 | 1665 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1666 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1667 | sk->sk_state = IUCV_CLOSED; | |
1668 | sk->sk_state_change(sk); | |
1669 | } | |
1670 | } | |
eac3731b | 1671 | |
eac3731b JH |
1672 | } |
1673 | ||
1674 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1675 | { | |
1676 | struct sock *sk = path->private; | |
1677 | ||
1678 | if (!list_empty(&iucv_sk(sk)->accept_q)) | |
1679 | sk->sk_state = IUCV_SEVERED; | |
1680 | else | |
1681 | sk->sk_state = IUCV_DISCONN; | |
1682 | ||
1683 | sk->sk_state_change(sk); | |
1684 | } | |
1685 | ||
af88b52d HB |
1686 | /* called if the other communication side shuts down its RECV direction; |
1687 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1688 | */ | |
1689 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1690 | { | |
1691 | struct sock *sk = path->private; | |
1692 | ||
1693 | bh_lock_sock(sk); | |
1694 | if (sk->sk_state != IUCV_CLOSED) { | |
1695 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1696 | sk->sk_state_change(sk); | |
1697 | } | |
1698 | bh_unlock_sock(sk); | |
1699 | } | |
1700 | ||
5708e868 | 1701 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
1702 | .family = PF_IUCV, |
1703 | .owner = THIS_MODULE, | |
1704 | .release = iucv_sock_release, | |
1705 | .bind = iucv_sock_bind, | |
1706 | .connect = iucv_sock_connect, | |
1707 | .listen = iucv_sock_listen, | |
1708 | .accept = iucv_sock_accept, | |
1709 | .getname = iucv_sock_getname, | |
1710 | .sendmsg = iucv_sock_sendmsg, | |
1711 | .recvmsg = iucv_sock_recvmsg, | |
1712 | .poll = iucv_sock_poll, | |
1713 | .ioctl = sock_no_ioctl, | |
1714 | .mmap = sock_no_mmap, | |
1715 | .socketpair = sock_no_socketpair, | |
1716 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
1717 | .setsockopt = iucv_sock_setsockopt, |
1718 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
1719 | }; |
1720 | ||
ec1b4cf7 | 1721 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
1722 | .family = AF_IUCV, |
1723 | .owner = THIS_MODULE, | |
1724 | .create = iucv_sock_create, | |
1725 | }; | |
1726 | ||
da99f056 | 1727 | static int __init afiucv_init(void) |
eac3731b JH |
1728 | { |
1729 | int err; | |
1730 | ||
1731 | if (!MACHINE_IS_VM) { | |
8f7c502c UB |
1732 | pr_err("The af_iucv module cannot be loaded" |
1733 | " without z/VM\n"); | |
eac3731b JH |
1734 | err = -EPROTONOSUPPORT; |
1735 | goto out; | |
1736 | } | |
1737 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
1738 | if (unlikely(err)) { | |
c2b4afd2 | 1739 | WARN_ON(err); |
eac3731b JH |
1740 | err = -EPROTONOSUPPORT; |
1741 | goto out; | |
1742 | } | |
1743 | ||
1744 | err = iucv_register(&af_iucv_handler, 0); | |
1745 | if (err) | |
1746 | goto out; | |
1747 | err = proto_register(&iucv_proto, 0); | |
1748 | if (err) | |
1749 | goto out_iucv; | |
1750 | err = sock_register(&iucv_sock_family_ops); | |
1751 | if (err) | |
1752 | goto out_proto; | |
c23cad92 UB |
1753 | /* establish dummy device */ |
1754 | err = driver_register(&af_iucv_driver); | |
1755 | if (err) | |
1756 | goto out_sock; | |
1757 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
1758 | if (!af_iucv_dev) { | |
1759 | err = -ENOMEM; | |
1760 | goto out_driver; | |
1761 | } | |
1762 | dev_set_name(af_iucv_dev, "af_iucv"); | |
1763 | af_iucv_dev->bus = &iucv_bus; | |
1764 | af_iucv_dev->parent = iucv_root; | |
1765 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
1766 | af_iucv_dev->driver = &af_iucv_driver; | |
1767 | err = device_register(af_iucv_dev); | |
1768 | if (err) | |
1769 | goto out_driver; | |
1770 | ||
eac3731b JH |
1771 | return 0; |
1772 | ||
c23cad92 UB |
1773 | out_driver: |
1774 | driver_unregister(&af_iucv_driver); | |
1775 | out_sock: | |
1776 | sock_unregister(PF_IUCV); | |
eac3731b JH |
1777 | out_proto: |
1778 | proto_unregister(&iucv_proto); | |
1779 | out_iucv: | |
1780 | iucv_unregister(&af_iucv_handler, 0); | |
1781 | out: | |
1782 | return err; | |
1783 | } | |
1784 | ||
1785 | static void __exit afiucv_exit(void) | |
1786 | { | |
c23cad92 UB |
1787 | device_unregister(af_iucv_dev); |
1788 | driver_unregister(&af_iucv_driver); | |
eac3731b JH |
1789 | sock_unregister(PF_IUCV); |
1790 | proto_unregister(&iucv_proto); | |
1791 | iucv_unregister(&af_iucv_handler, 0); | |
eac3731b JH |
1792 | } |
1793 | ||
1794 | module_init(afiucv_init); | |
1795 | module_exit(afiucv_exit); | |
1796 | ||
1797 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
1798 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
1799 | MODULE_VERSION(VERSION); | |
1800 | MODULE_LICENSE("GPL"); | |
1801 | MODULE_ALIAS_NETPROTO(PF_IUCV); |