Commit | Line | Data |
---|---|---|
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; \ | |
d9973179 | 62 | prepare_to_wait(sk->sk_sleep, &__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 | } \ | |
79 | finish_wait(sk->sk_sleep, &__wait); \ | |
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 | { | |
308 | read_lock(&sk->sk_callback_lock); | |
a57de0b4 | 309 | if (sk_has_sleeper(sk)) |
0ea920d2 HB |
310 | wake_up_interruptible_all(sk->sk_sleep); |
311 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); | |
312 | read_unlock(&sk->sk_callback_lock); | |
313 | } | |
314 | ||
eac3731b JH |
315 | /* Timers */ |
316 | static void iucv_sock_timeout(unsigned long arg) | |
317 | { | |
318 | struct sock *sk = (struct sock *)arg; | |
319 | ||
320 | bh_lock_sock(sk); | |
321 | sk->sk_err = ETIMEDOUT; | |
322 | sk->sk_state_change(sk); | |
323 | bh_unlock_sock(sk); | |
324 | ||
325 | iucv_sock_kill(sk); | |
326 | sock_put(sk); | |
327 | } | |
328 | ||
329 | static void iucv_sock_clear_timer(struct sock *sk) | |
330 | { | |
331 | sk_stop_timer(sk, &sk->sk_timer); | |
332 | } | |
333 | ||
eac3731b JH |
334 | static struct sock *__iucv_get_sock_by_name(char *nm) |
335 | { | |
336 | struct sock *sk; | |
337 | struct hlist_node *node; | |
338 | ||
339 | sk_for_each(sk, node, &iucv_sk_list.head) | |
340 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
341 | return sk; | |
342 | ||
343 | return NULL; | |
344 | } | |
345 | ||
346 | static void iucv_sock_destruct(struct sock *sk) | |
347 | { | |
348 | skb_queue_purge(&sk->sk_receive_queue); | |
349 | skb_queue_purge(&sk->sk_write_queue); | |
350 | } | |
351 | ||
352 | /* Cleanup Listen */ | |
353 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
354 | { | |
355 | struct sock *sk; | |
356 | ||
357 | /* Close non-accepted connections */ | |
358 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
359 | iucv_sock_close(sk); | |
360 | iucv_sock_kill(sk); | |
361 | } | |
362 | ||
363 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
364 | } |
365 | ||
7514bab0 | 366 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
367 | static void iucv_sock_kill(struct sock *sk) |
368 | { | |
369 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
370 | return; | |
371 | ||
372 | iucv_sock_unlink(&iucv_sk_list, sk); | |
373 | sock_set_flag(sk, SOCK_DEAD); | |
374 | sock_put(sk); | |
375 | } | |
376 | ||
377 | /* Close an IUCV socket */ | |
378 | static void iucv_sock_close(struct sock *sk) | |
379 | { | |
380 | unsigned char user_data[16]; | |
381 | struct iucv_sock *iucv = iucv_sk(sk); | |
382 | int err; | |
561e0360 | 383 | unsigned long timeo; |
eac3731b JH |
384 | |
385 | iucv_sock_clear_timer(sk); | |
386 | lock_sock(sk); | |
387 | ||
da99f056 | 388 | switch (sk->sk_state) { |
eac3731b JH |
389 | case IUCV_LISTEN: |
390 | iucv_sock_cleanup_listen(sk); | |
391 | break; | |
392 | ||
393 | case IUCV_CONNECTED: | |
394 | case IUCV_DISCONN: | |
395 | err = 0; | |
561e0360 JH |
396 | |
397 | sk->sk_state = IUCV_CLOSING; | |
398 | sk->sk_state_change(sk); | |
399 | ||
da99f056 | 400 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
401 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
402 | timeo = sk->sk_lingertime; | |
403 | else | |
404 | timeo = IUCV_DISCONN_TIMEOUT; | |
0ea920d2 HB |
405 | err = iucv_sock_wait(sk, |
406 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), | |
407 | timeo); | |
561e0360 JH |
408 | } |
409 | ||
bbe188c8 | 410 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
411 | sk->sk_state = IUCV_CLOSED; |
412 | sk->sk_state_change(sk); | |
413 | ||
eac3731b JH |
414 | if (iucv->path) { |
415 | low_nmcpy(user_data, iucv->src_name); | |
416 | high_nmcpy(user_data, iucv->dst_name); | |
417 | ASCEBC(user_data, sizeof(user_data)); | |
418 | err = iucv_path_sever(iucv->path, user_data); | |
419 | iucv_path_free(iucv->path); | |
420 | iucv->path = NULL; | |
421 | } | |
422 | ||
eac3731b JH |
423 | sk->sk_err = ECONNRESET; |
424 | sk->sk_state_change(sk); | |
425 | ||
426 | skb_queue_purge(&iucv->send_skb_q); | |
561e0360 | 427 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b JH |
428 | break; |
429 | ||
430 | default: | |
7514bab0 | 431 | /* nothing to do here */ |
eac3731b | 432 | break; |
3ff50b79 | 433 | } |
eac3731b | 434 | |
7514bab0 HB |
435 | /* mark socket for deletion by iucv_sock_kill() */ |
436 | sock_set_flag(sk, SOCK_ZAPPED); | |
437 | ||
eac3731b | 438 | release_sock(sk); |
eac3731b JH |
439 | } |
440 | ||
441 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
442 | { | |
443 | if (parent) | |
444 | sk->sk_type = parent->sk_type; | |
445 | } | |
446 | ||
447 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
448 | { | |
449 | struct sock *sk; | |
450 | ||
6257ff21 | 451 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
452 | if (!sk) |
453 | return NULL; | |
454 | ||
455 | sock_init_data(sock, sk); | |
456 | INIT_LIST_HEAD(&iucv_sk(sk)->accept_q); | |
febca281 | 457 | spin_lock_init(&iucv_sk(sk)->accept_q_lock); |
eac3731b | 458 | skb_queue_head_init(&iucv_sk(sk)->send_skb_q); |
f0703c80 UB |
459 | INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list); |
460 | spin_lock_init(&iucv_sk(sk)->message_q.lock); | |
561e0360 | 461 | skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q); |
eac3731b | 462 | iucv_sk(sk)->send_tag = 0; |
9d5c5d8f | 463 | iucv_sk(sk)->flags = 0; |
09488e2e | 464 | iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT; |
bbe188c8 UB |
465 | iucv_sk(sk)->path = NULL; |
466 | memset(&iucv_sk(sk)->src_user_id , 0, 32); | |
eac3731b JH |
467 | |
468 | sk->sk_destruct = iucv_sock_destruct; | |
469 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
470 | sk->sk_allocation = GFP_DMA; | |
471 | ||
472 | sock_reset_flag(sk, SOCK_ZAPPED); | |
473 | ||
474 | sk->sk_protocol = proto; | |
475 | sk->sk_state = IUCV_OPEN; | |
476 | ||
b24b8a24 | 477 | setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk); |
eac3731b JH |
478 | |
479 | iucv_sock_link(&iucv_sk_list, sk); | |
480 | return sk; | |
481 | } | |
482 | ||
483 | /* Create an IUCV socket */ | |
3f378b68 EP |
484 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
485 | int kern) | |
eac3731b JH |
486 | { |
487 | struct sock *sk; | |
488 | ||
aa8e71f5 HB |
489 | if (protocol && protocol != PF_IUCV) |
490 | return -EPROTONOSUPPORT; | |
eac3731b JH |
491 | |
492 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
493 | |
494 | switch (sock->type) { | |
495 | case SOCK_STREAM: | |
496 | sock->ops = &iucv_sock_ops; | |
497 | break; | |
498 | case SOCK_SEQPACKET: | |
499 | /* currently, proto ops can handle both sk types */ | |
500 | sock->ops = &iucv_sock_ops; | |
501 | break; | |
502 | default: | |
503 | return -ESOCKTNOSUPPORT; | |
504 | } | |
eac3731b JH |
505 | |
506 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
507 | if (!sk) | |
508 | return -ENOMEM; | |
509 | ||
510 | iucv_sock_init(sk, NULL); | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
515 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
516 | { | |
517 | write_lock_bh(&l->lock); | |
518 | sk_add_node(sk, &l->head); | |
519 | write_unlock_bh(&l->lock); | |
520 | } | |
521 | ||
522 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
523 | { | |
524 | write_lock_bh(&l->lock); | |
525 | sk_del_node_init(sk); | |
526 | write_unlock_bh(&l->lock); | |
527 | } | |
528 | ||
529 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
530 | { | |
febca281 UB |
531 | unsigned long flags; |
532 | struct iucv_sock *par = iucv_sk(parent); | |
533 | ||
eac3731b | 534 | sock_hold(sk); |
febca281 UB |
535 | spin_lock_irqsave(&par->accept_q_lock, flags); |
536 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
537 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 538 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 539 | sk_acceptq_added(parent); |
eac3731b JH |
540 | } |
541 | ||
542 | void iucv_accept_unlink(struct sock *sk) | |
543 | { | |
febca281 UB |
544 | unsigned long flags; |
545 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
546 | ||
547 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 548 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 549 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 550 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
551 | iucv_sk(sk)->parent = NULL; |
552 | sock_put(sk); | |
553 | } | |
554 | ||
555 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
556 | { | |
557 | struct iucv_sock *isk, *n; | |
558 | struct sock *sk; | |
559 | ||
da99f056 | 560 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
561 | sk = (struct sock *) isk; |
562 | lock_sock(sk); | |
563 | ||
564 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 565 | iucv_accept_unlink(sk); |
febca281 | 566 | release_sock(sk); |
eac3731b JH |
567 | continue; |
568 | } | |
569 | ||
570 | if (sk->sk_state == IUCV_CONNECTED || | |
571 | sk->sk_state == IUCV_SEVERED || | |
56a73de3 | 572 | sk->sk_state == IUCV_DISCONN || /* due to PM restore */ |
eac3731b JH |
573 | !newsock) { |
574 | iucv_accept_unlink(sk); | |
575 | if (newsock) | |
576 | sock_graft(sk, newsock); | |
577 | ||
578 | if (sk->sk_state == IUCV_SEVERED) | |
579 | sk->sk_state = IUCV_DISCONN; | |
580 | ||
581 | release_sock(sk); | |
582 | return sk; | |
583 | } | |
584 | ||
585 | release_sock(sk); | |
586 | } | |
587 | return NULL; | |
588 | } | |
589 | ||
eac3731b JH |
590 | /* Bind an unbound socket */ |
591 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
592 | int addr_len) | |
593 | { | |
594 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
595 | struct sock *sk = sock->sk; | |
596 | struct iucv_sock *iucv; | |
597 | int err; | |
598 | ||
599 | /* Verify the input sockaddr */ | |
600 | if (!addr || addr->sa_family != AF_IUCV) | |
601 | return -EINVAL; | |
602 | ||
603 | lock_sock(sk); | |
604 | if (sk->sk_state != IUCV_OPEN) { | |
605 | err = -EBADFD; | |
606 | goto done; | |
607 | } | |
608 | ||
609 | write_lock_bh(&iucv_sk_list.lock); | |
610 | ||
611 | iucv = iucv_sk(sk); | |
612 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
613 | err = -EADDRINUSE; | |
614 | goto done_unlock; | |
615 | } | |
616 | if (iucv->path) { | |
617 | err = 0; | |
618 | goto done_unlock; | |
619 | } | |
620 | ||
621 | /* Bind the socket */ | |
622 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
623 | ||
624 | /* Copy the user id */ | |
625 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
626 | sk->sk_state = IUCV_BOUND; | |
627 | err = 0; | |
628 | ||
629 | done_unlock: | |
630 | /* Release the socket list lock */ | |
631 | write_unlock_bh(&iucv_sk_list.lock); | |
632 | done: | |
633 | release_sock(sk); | |
634 | return err; | |
635 | } | |
636 | ||
637 | /* Automatically bind an unbound socket */ | |
638 | static int iucv_sock_autobind(struct sock *sk) | |
639 | { | |
640 | struct iucv_sock *iucv = iucv_sk(sk); | |
641 | char query_buffer[80]; | |
642 | char name[12]; | |
643 | int err = 0; | |
644 | ||
645 | /* Set the userid and name */ | |
646 | cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err); | |
647 | if (unlikely(err)) | |
648 | return -EPROTO; | |
649 | ||
650 | memcpy(iucv->src_user_id, query_buffer, 8); | |
651 | ||
652 | write_lock_bh(&iucv_sk_list.lock); | |
653 | ||
654 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
655 | while (__iucv_get_sock_by_name(name)) { | |
656 | sprintf(name, "%08x", | |
657 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
658 | } | |
659 | ||
660 | write_unlock_bh(&iucv_sk_list.lock); | |
661 | ||
662 | memcpy(&iucv->src_name, name, 8); | |
663 | ||
664 | return err; | |
665 | } | |
666 | ||
667 | /* Connect an unconnected socket */ | |
668 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
669 | int alen, int flags) | |
670 | { | |
671 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
672 | struct sock *sk = sock->sk; | |
673 | struct iucv_sock *iucv; | |
674 | unsigned char user_data[16]; | |
675 | int err; | |
676 | ||
677 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
678 | return -EINVAL; | |
679 | ||
680 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
681 | return -EBADFD; | |
682 | ||
aa8e71f5 | 683 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) |
eac3731b JH |
684 | return -EINVAL; |
685 | ||
eac3731b JH |
686 | if (sk->sk_state == IUCV_OPEN) { |
687 | err = iucv_sock_autobind(sk); | |
688 | if (unlikely(err)) | |
689 | return err; | |
690 | } | |
691 | ||
692 | lock_sock(sk); | |
693 | ||
694 | /* Set the destination information */ | |
695 | memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8); | |
696 | memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8); | |
697 | ||
698 | high_nmcpy(user_data, sa->siucv_name); | |
699 | low_nmcpy(user_data, iucv_sk(sk)->src_name); | |
700 | ASCEBC(user_data, sizeof(user_data)); | |
701 | ||
702 | iucv = iucv_sk(sk); | |
703 | /* Create path. */ | |
09488e2e | 704 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 705 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
706 | if (!iucv->path) { |
707 | err = -ENOMEM; | |
708 | goto done; | |
709 | } | |
eac3731b JH |
710 | err = iucv_path_connect(iucv->path, &af_iucv_handler, |
711 | sa->siucv_user_id, NULL, user_data, sk); | |
712 | if (err) { | |
713 | iucv_path_free(iucv->path); | |
714 | iucv->path = NULL; | |
55cdea9e HB |
715 | switch (err) { |
716 | case 0x0b: /* Target communicator is not logged on */ | |
717 | err = -ENETUNREACH; | |
718 | break; | |
719 | case 0x0d: /* Max connections for this guest exceeded */ | |
720 | case 0x0e: /* Max connections for target guest exceeded */ | |
721 | err = -EAGAIN; | |
722 | break; | |
723 | case 0x0f: /* Missing IUCV authorization */ | |
724 | err = -EACCES; | |
725 | break; | |
726 | default: | |
727 | err = -ECONNREFUSED; | |
728 | break; | |
729 | } | |
eac3731b JH |
730 | goto done; |
731 | } | |
732 | ||
733 | if (sk->sk_state != IUCV_CONNECTED) { | |
0ea920d2 HB |
734 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
735 | IUCV_DISCONN), | |
736 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b JH |
737 | } |
738 | ||
739 | if (sk->sk_state == IUCV_DISCONN) { | |
b8942e3b | 740 | err = -ECONNREFUSED; |
eac3731b | 741 | } |
18becbc5 UB |
742 | |
743 | if (err) { | |
744 | iucv_path_sever(iucv->path, NULL); | |
745 | iucv_path_free(iucv->path); | |
746 | iucv->path = NULL; | |
747 | } | |
748 | ||
eac3731b JH |
749 | done: |
750 | release_sock(sk); | |
751 | return err; | |
752 | } | |
753 | ||
754 | /* Move a socket into listening state. */ | |
755 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
756 | { | |
757 | struct sock *sk = sock->sk; | |
758 | int err; | |
759 | ||
760 | lock_sock(sk); | |
761 | ||
762 | err = -EINVAL; | |
aa8e71f5 HB |
763 | if (sk->sk_state != IUCV_BOUND) |
764 | goto done; | |
765 | ||
766 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
767 | goto done; |
768 | ||
769 | sk->sk_max_ack_backlog = backlog; | |
770 | sk->sk_ack_backlog = 0; | |
771 | sk->sk_state = IUCV_LISTEN; | |
772 | err = 0; | |
773 | ||
774 | done: | |
775 | release_sock(sk); | |
776 | return err; | |
777 | } | |
778 | ||
779 | /* Accept a pending connection */ | |
780 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
781 | int flags) | |
782 | { | |
783 | DECLARE_WAITQUEUE(wait, current); | |
784 | struct sock *sk = sock->sk, *nsk; | |
785 | long timeo; | |
786 | int err = 0; | |
787 | ||
561e0360 | 788 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
789 | |
790 | if (sk->sk_state != IUCV_LISTEN) { | |
791 | err = -EBADFD; | |
792 | goto done; | |
793 | } | |
794 | ||
795 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
796 | ||
797 | /* Wait for an incoming connection */ | |
798 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
da99f056 | 799 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
800 | set_current_state(TASK_INTERRUPTIBLE); |
801 | if (!timeo) { | |
802 | err = -EAGAIN; | |
803 | break; | |
804 | } | |
805 | ||
806 | release_sock(sk); | |
807 | timeo = schedule_timeout(timeo); | |
561e0360 | 808 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
809 | |
810 | if (sk->sk_state != IUCV_LISTEN) { | |
811 | err = -EBADFD; | |
812 | break; | |
813 | } | |
814 | ||
815 | if (signal_pending(current)) { | |
816 | err = sock_intr_errno(timeo); | |
817 | break; | |
818 | } | |
819 | } | |
820 | ||
821 | set_current_state(TASK_RUNNING); | |
822 | remove_wait_queue(sk->sk_sleep, &wait); | |
823 | ||
824 | if (err) | |
825 | goto done; | |
826 | ||
827 | newsock->state = SS_CONNECTED; | |
828 | ||
829 | done: | |
830 | release_sock(sk); | |
831 | return err; | |
832 | } | |
833 | ||
834 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
835 | int *len, int peer) | |
836 | { | |
837 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
838 | struct sock *sk = sock->sk; | |
839 | ||
840 | addr->sa_family = AF_IUCV; | |
841 | *len = sizeof(struct sockaddr_iucv); | |
842 | ||
843 | if (peer) { | |
844 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8); | |
845 | memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8); | |
846 | } else { | |
847 | memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8); | |
848 | memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8); | |
849 | } | |
850 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
851 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
852 | memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
b8942e3b HB |
857 | /** |
858 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
859 | * @path: IUCV path | |
860 | * @msg: Pointer to a struct iucv_message | |
861 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
862 | * | |
863 | * Send the socket data in the parameter list in the iucv message | |
864 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
865 | * list and the socket data len at index 7 (last byte). | |
866 | * See also iucv_msg_length(). | |
867 | * | |
868 | * Returns the error code from the iucv_message_send() call. | |
869 | */ | |
870 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
871 | struct sk_buff *skb) | |
872 | { | |
873 | u8 prmdata[8]; | |
874 | ||
875 | memcpy(prmdata, (void *) skb->data, skb->len); | |
876 | prmdata[7] = 0xff - (u8) skb->len; | |
877 | return iucv_message_send(path, msg, IUCV_IPRMDATA, 0, | |
878 | (void *) prmdata, 8); | |
879 | } | |
880 | ||
eac3731b JH |
881 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
882 | struct msghdr *msg, size_t len) | |
883 | { | |
884 | struct sock *sk = sock->sk; | |
885 | struct iucv_sock *iucv = iucv_sk(sk); | |
886 | struct sk_buff *skb; | |
887 | struct iucv_message txmsg; | |
44b1e6b5 HB |
888 | struct cmsghdr *cmsg; |
889 | int cmsg_done; | |
0ea920d2 | 890 | long timeo; |
8f7c502c UB |
891 | char user_id[9]; |
892 | char appl_id[9]; | |
eac3731b | 893 | int err; |
0ea920d2 | 894 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
895 | |
896 | err = sock_error(sk); | |
897 | if (err) | |
898 | return err; | |
899 | ||
900 | if (msg->msg_flags & MSG_OOB) | |
901 | return -EOPNOTSUPP; | |
902 | ||
aa8e71f5 HB |
903 | /* SOCK_SEQPACKET: we do not support segmented records */ |
904 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
905 | return -EOPNOTSUPP; | |
906 | ||
eac3731b JH |
907 | lock_sock(sk); |
908 | ||
909 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
910 | err = -EPIPE; | |
911 | goto out; | |
912 | } | |
913 | ||
bb664f49 HB |
914 | /* Return if the socket is not in connected state */ |
915 | if (sk->sk_state != IUCV_CONNECTED) { | |
916 | err = -ENOTCONN; | |
917 | goto out; | |
918 | } | |
44b1e6b5 | 919 | |
bb664f49 HB |
920 | /* initialize defaults */ |
921 | cmsg_done = 0; /* check for duplicate headers */ | |
922 | txmsg.class = 0; | |
44b1e6b5 | 923 | |
bb664f49 HB |
924 | /* iterate over control messages */ |
925 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; | |
926 | cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
44b1e6b5 | 927 | |
bb664f49 HB |
928 | if (!CMSG_OK(msg, cmsg)) { |
929 | err = -EINVAL; | |
930 | goto out; | |
931 | } | |
44b1e6b5 | 932 | |
bb664f49 HB |
933 | if (cmsg->cmsg_level != SOL_IUCV) |
934 | continue; | |
44b1e6b5 | 935 | |
bb664f49 HB |
936 | if (cmsg->cmsg_type & cmsg_done) { |
937 | err = -EINVAL; | |
938 | goto out; | |
939 | } | |
940 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 941 | |
bb664f49 HB |
942 | switch (cmsg->cmsg_type) { |
943 | case SCM_IUCV_TRGCLS: | |
944 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
945 | err = -EINVAL; |
946 | goto out; | |
947 | } | |
44b1e6b5 | 948 | |
bb664f49 HB |
949 | /* set iucv message target class */ |
950 | memcpy(&txmsg.class, | |
951 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 952 | |
bb664f49 | 953 | break; |
44b1e6b5 | 954 | |
bb664f49 HB |
955 | default: |
956 | err = -EINVAL; | |
957 | goto out; | |
958 | break; | |
44b1e6b5 | 959 | } |
bb664f49 | 960 | } |
44b1e6b5 | 961 | |
bb664f49 HB |
962 | /* allocate one skb for each iucv message: |
963 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
964 | * segmented records using the MSG_EOR flag), but | |
965 | * for SOCK_STREAM we might want to improve it in future */ | |
0ea920d2 | 966 | skb = sock_alloc_send_skb(sk, len, noblock, &err); |
bb664f49 HB |
967 | if (!skb) |
968 | goto out; | |
969 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { | |
970 | err = -EFAULT; | |
971 | goto fail; | |
972 | } | |
eac3731b | 973 | |
0ea920d2 HB |
974 | /* wait if outstanding messages for iucv path has reached */ |
975 | timeo = sock_sndtimeo(sk, noblock); | |
976 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
977 | if (err) | |
978 | goto fail; | |
eac3731b | 979 | |
0ea920d2 HB |
980 | /* return -ECONNRESET if the socket is no longer connected */ |
981 | if (sk->sk_state != IUCV_CONNECTED) { | |
982 | err = -ECONNRESET; | |
983 | goto fail; | |
984 | } | |
b8942e3b | 985 | |
bb664f49 HB |
986 | /* increment and save iucv message tag for msg_completion cbk */ |
987 | txmsg.tag = iucv->send_tag++; | |
988 | memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); | |
989 | skb_queue_tail(&iucv->send_skb_q, skb); | |
b8942e3b | 990 | |
bb664f49 HB |
991 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
992 | && skb->len <= 7) { | |
993 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 994 | |
bb664f49 HB |
995 | /* on success: there is no message_complete callback |
996 | * for an IPRMDATA msg; remove skb from send queue */ | |
997 | if (err == 0) { | |
998 | skb_unlink(skb, &iucv->send_skb_q); | |
999 | kfree_skb(skb); | |
1000 | } | |
1001 | ||
1002 | /* this error should never happen since the | |
1003 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1004 | if (err == 0x15) { | |
1005 | iucv_path_sever(iucv->path, NULL); | |
eac3731b JH |
1006 | skb_unlink(skb, &iucv->send_skb_q); |
1007 | err = -EPIPE; | |
1008 | goto fail; | |
1009 | } | |
bb664f49 HB |
1010 | } else |
1011 | err = iucv_message_send(iucv->path, &txmsg, 0, 0, | |
1012 | (void *) skb->data, skb->len); | |
1013 | if (err) { | |
1014 | if (err == 3) { | |
1015 | user_id[8] = 0; | |
1016 | memcpy(user_id, iucv->dst_user_id, 8); | |
1017 | appl_id[8] = 0; | |
1018 | memcpy(appl_id, iucv->dst_name, 8); | |
1019 | pr_err("Application %s on z/VM guest %s" | |
1020 | " exceeds message limit\n", | |
1021 | appl_id, user_id); | |
0ea920d2 HB |
1022 | err = -EAGAIN; |
1023 | } else | |
1024 | err = -EPIPE; | |
bb664f49 | 1025 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1026 | goto fail; |
eac3731b JH |
1027 | } |
1028 | ||
1029 | release_sock(sk); | |
1030 | return len; | |
1031 | ||
1032 | fail: | |
1033 | kfree_skb(skb); | |
1034 | out: | |
1035 | release_sock(sk); | |
1036 | return err; | |
1037 | } | |
1038 | ||
bf95d20f HB |
1039 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1040 | * | |
1041 | * Locking: must be called with message_q.lock held | |
1042 | */ | |
f0703c80 UB |
1043 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1044 | { | |
1045 | int dataleft, size, copied = 0; | |
1046 | struct sk_buff *nskb; | |
1047 | ||
1048 | dataleft = len; | |
1049 | while (dataleft) { | |
1050 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1051 | size = sk->sk_rcvbuf / 4; | |
1052 | else | |
1053 | size = dataleft; | |
1054 | ||
1055 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1056 | if (!nskb) | |
1057 | return -ENOMEM; | |
1058 | ||
44b1e6b5 HB |
1059 | /* copy target class to control buffer of new skb */ |
1060 | memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); | |
1061 | ||
1062 | /* copy data fragment */ | |
f0703c80 UB |
1063 | memcpy(nskb->data, skb->data + copied, size); |
1064 | copied += size; | |
1065 | dataleft -= size; | |
1066 | ||
1067 | skb_reset_transport_header(nskb); | |
1068 | skb_reset_network_header(nskb); | |
1069 | nskb->len = size; | |
1070 | ||
1071 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1072 | } | |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
bf95d20f HB |
1077 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1078 | * | |
1079 | * Locking: must be called with message_q.lock held | |
1080 | */ | |
f0703c80 UB |
1081 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1082 | struct iucv_path *path, | |
1083 | struct iucv_message *msg) | |
1084 | { | |
1085 | int rc; | |
b8942e3b HB |
1086 | unsigned int len; |
1087 | ||
1088 | len = iucv_msg_length(msg); | |
f0703c80 | 1089 | |
44b1e6b5 HB |
1090 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1091 | /* Note: the first 4 bytes are reserved for msg tag */ | |
1092 | memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); | |
1093 | ||
b8942e3b HB |
1094 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1095 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1096 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1097 | skb->data = NULL; | |
1098 | skb->len = 0; | |
1099 | } | |
f0703c80 | 1100 | } else { |
b8942e3b HB |
1101 | rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA, |
1102 | skb->data, len, NULL); | |
f0703c80 UB |
1103 | if (rc) { |
1104 | kfree_skb(skb); | |
1105 | return; | |
1106 | } | |
aa8e71f5 HB |
1107 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1108 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1109 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1110 | if (sk->sk_type == SOCK_STREAM && | |
1111 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1112 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1113 | kfree_skb(skb); |
1114 | skb = NULL; | |
1115 | if (rc) { | |
1116 | iucv_path_sever(path, NULL); | |
1117 | return; | |
1118 | } | |
1119 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1120 | } else { | |
1121 | skb_reset_transport_header(skb); | |
1122 | skb_reset_network_header(skb); | |
b8942e3b | 1123 | skb->len = len; |
f0703c80 UB |
1124 | } |
1125 | } | |
1126 | ||
1127 | if (sock_queue_rcv_skb(sk, skb)) | |
1128 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1129 | } | |
1130 | ||
bf95d20f HB |
1131 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1132 | * | |
1133 | * Locking: must be called with message_q.lock held | |
1134 | */ | |
f0703c80 UB |
1135 | static void iucv_process_message_q(struct sock *sk) |
1136 | { | |
1137 | struct iucv_sock *iucv = iucv_sk(sk); | |
1138 | struct sk_buff *skb; | |
1139 | struct sock_msg_q *p, *n; | |
1140 | ||
1141 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1142 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1143 | if (!skb) |
1144 | break; | |
1145 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1146 | list_del(&p->list); | |
1147 | kfree(p); | |
1148 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1149 | break; | |
1150 | } | |
1151 | } | |
1152 | ||
eac3731b JH |
1153 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1154 | struct msghdr *msg, size_t len, int flags) | |
1155 | { | |
1156 | int noblock = flags & MSG_DONTWAIT; | |
1157 | struct sock *sk = sock->sk; | |
561e0360 | 1158 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1159 | unsigned int copied, rlen; |
561e0360 | 1160 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b JH |
1161 | int err = 0; |
1162 | ||
561e0360 | 1163 | if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && |
f0703c80 UB |
1164 | skb_queue_empty(&iucv->backlog_skb_q) && |
1165 | skb_queue_empty(&sk->sk_receive_queue) && | |
1166 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1167 | return 0; |
1168 | ||
eac3731b JH |
1169 | if (flags & (MSG_OOB)) |
1170 | return -EOPNOTSUPP; | |
1171 | ||
60d3705f HB |
1172 | /* receive/dequeue next skb: |
1173 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1174 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1175 | if (!skb) { | |
1176 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1177 | return 0; | |
1178 | return err; | |
1179 | } | |
1180 | ||
aa8e71f5 HB |
1181 | rlen = skb->len; /* real length of skb */ |
1182 | copied = min_t(unsigned int, rlen, len); | |
eac3731b | 1183 | |
561e0360 JH |
1184 | cskb = skb; |
1185 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
802788bf HB |
1186 | if (!(flags & MSG_PEEK)) |
1187 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1188 | return -EFAULT; | |
eac3731b JH |
1189 | } |
1190 | ||
aa8e71f5 HB |
1191 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1192 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1193 | if (copied < rlen) | |
1194 | msg->msg_flags |= MSG_TRUNC; | |
1195 | /* each iucv message contains a complete record */ | |
1196 | msg->msg_flags |= MSG_EOR; | |
1197 | } | |
eac3731b | 1198 | |
44b1e6b5 HB |
1199 | /* create control message to store iucv msg target class: |
1200 | * get the trgcls from the control buffer of the skb due to | |
1201 | * fragmentation of original iucv message. */ | |
1202 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
1203 | CB_TRGCLS_LEN, CB_TRGCLS(skb)); | |
1204 | if (err) { | |
1205 | if (!(flags & MSG_PEEK)) | |
1206 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1207 | return err; | |
1208 | } | |
1209 | ||
eac3731b JH |
1210 | /* Mark read part of skb as used */ |
1211 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1212 | |
aa8e71f5 HB |
1213 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1214 | if (sk->sk_type == SOCK_STREAM) { | |
1215 | skb_pull(skb, copied); | |
1216 | if (skb->len) { | |
1217 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1218 | goto done; | |
1219 | } | |
eac3731b JH |
1220 | } |
1221 | ||
1222 | kfree_skb(skb); | |
561e0360 JH |
1223 | |
1224 | /* Queue backlog skbs */ | |
bf95d20f | 1225 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1226 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1227 | while (rskb) { |
561e0360 | 1228 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1229 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1230 | rskb); |
1231 | break; | |
1232 | } else { | |
f0703c80 | 1233 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1234 | } |
1235 | } | |
f0703c80 | 1236 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1237 | if (!list_empty(&iucv->message_q.list)) |
1238 | iucv_process_message_q(sk); | |
f0703c80 | 1239 | } |
bf95d20f | 1240 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1241 | } |
eac3731b JH |
1242 | |
1243 | done: | |
aa8e71f5 HB |
1244 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1245 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1246 | copied = rlen; | |
1247 | ||
1248 | return copied; | |
eac3731b JH |
1249 | } |
1250 | ||
1251 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1252 | { | |
1253 | struct iucv_sock *isk, *n; | |
1254 | struct sock *sk; | |
1255 | ||
da99f056 | 1256 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1257 | sk = (struct sock *) isk; |
1258 | ||
1259 | if (sk->sk_state == IUCV_CONNECTED) | |
1260 | return POLLIN | POLLRDNORM; | |
1261 | } | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1267 | poll_table *wait) | |
1268 | { | |
1269 | struct sock *sk = sock->sk; | |
1270 | unsigned int mask = 0; | |
1271 | ||
a57de0b4 | 1272 | sock_poll_wait(file, sk->sk_sleep, wait); |
eac3731b JH |
1273 | |
1274 | if (sk->sk_state == IUCV_LISTEN) | |
1275 | return iucv_accept_poll(sk); | |
1276 | ||
1277 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
1278 | mask |= POLLERR; | |
1279 | ||
1280 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1281 | mask |= POLLRDHUP; | |
1282 | ||
1283 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1284 | mask |= POLLHUP; | |
1285 | ||
1286 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1287 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1288 | mask |= POLLIN | POLLRDNORM; |
1289 | ||
1290 | if (sk->sk_state == IUCV_CLOSED) | |
1291 | mask |= POLLHUP; | |
1292 | ||
561e0360 JH |
1293 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) |
1294 | mask |= POLLIN; | |
1295 | ||
eac3731b JH |
1296 | if (sock_writeable(sk)) |
1297 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1298 | else | |
1299 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1300 | ||
1301 | return mask; | |
1302 | } | |
1303 | ||
1304 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1305 | { | |
1306 | struct sock *sk = sock->sk; | |
1307 | struct iucv_sock *iucv = iucv_sk(sk); | |
1308 | struct iucv_message txmsg; | |
1309 | int err = 0; | |
eac3731b JH |
1310 | |
1311 | how++; | |
1312 | ||
1313 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1314 | return -EINVAL; | |
1315 | ||
1316 | lock_sock(sk); | |
da99f056 | 1317 | switch (sk->sk_state) { |
e14ad5fa HB |
1318 | case IUCV_DISCONN: |
1319 | case IUCV_CLOSING: | |
1320 | case IUCV_SEVERED: | |
eac3731b JH |
1321 | case IUCV_CLOSED: |
1322 | err = -ENOTCONN; | |
1323 | goto fail; | |
1324 | ||
1325 | default: | |
1326 | sk->sk_shutdown |= how; | |
1327 | break; | |
1328 | } | |
1329 | ||
1330 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1331 | txmsg.class = 0; | |
1332 | txmsg.tag = 0; | |
1333 | err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0, | |
b8942e3b | 1334 | (void *) iprm_shutdown, 8); |
eac3731b | 1335 | if (err) { |
da99f056 | 1336 | switch (err) { |
eac3731b JH |
1337 | case 1: |
1338 | err = -ENOTCONN; | |
1339 | break; | |
1340 | case 2: | |
1341 | err = -ECONNRESET; | |
1342 | break; | |
1343 | default: | |
1344 | err = -ENOTCONN; | |
1345 | break; | |
1346 | } | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1351 | err = iucv_path_quiesce(iucv_sk(sk)->path, NULL); | |
1352 | if (err) | |
1353 | err = -ENOTCONN; | |
1354 | ||
1355 | skb_queue_purge(&sk->sk_receive_queue); | |
1356 | } | |
1357 | ||
1358 | /* Wake up anyone sleeping in poll */ | |
1359 | sk->sk_state_change(sk); | |
1360 | ||
1361 | fail: | |
1362 | release_sock(sk); | |
1363 | return err; | |
1364 | } | |
1365 | ||
1366 | static int iucv_sock_release(struct socket *sock) | |
1367 | { | |
1368 | struct sock *sk = sock->sk; | |
1369 | int err = 0; | |
1370 | ||
1371 | if (!sk) | |
1372 | return 0; | |
1373 | ||
1374 | iucv_sock_close(sk); | |
1375 | ||
1376 | /* Unregister with IUCV base support */ | |
1377 | if (iucv_sk(sk)->path) { | |
1378 | iucv_path_sever(iucv_sk(sk)->path, NULL); | |
1379 | iucv_path_free(iucv_sk(sk)->path); | |
1380 | iucv_sk(sk)->path = NULL; | |
1381 | } | |
1382 | ||
eac3731b JH |
1383 | sock_orphan(sk); |
1384 | iucv_sock_kill(sk); | |
1385 | return err; | |
1386 | } | |
1387 | ||
9d5c5d8f HB |
1388 | /* getsockopt and setsockopt */ |
1389 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1390 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1391 | { |
1392 | struct sock *sk = sock->sk; | |
1393 | struct iucv_sock *iucv = iucv_sk(sk); | |
1394 | int val; | |
1395 | int rc; | |
1396 | ||
1397 | if (level != SOL_IUCV) | |
1398 | return -ENOPROTOOPT; | |
1399 | ||
1400 | if (optlen < sizeof(int)) | |
1401 | return -EINVAL; | |
1402 | ||
1403 | if (get_user(val, (int __user *) optval)) | |
1404 | return -EFAULT; | |
1405 | ||
1406 | rc = 0; | |
1407 | ||
1408 | lock_sock(sk); | |
1409 | switch (optname) { | |
1410 | case SO_IPRMDATA_MSG: | |
1411 | if (val) | |
1412 | iucv->flags |= IUCV_IPRMDATA; | |
1413 | else | |
1414 | iucv->flags &= ~IUCV_IPRMDATA; | |
1415 | break; | |
09488e2e HB |
1416 | case SO_MSGLIMIT: |
1417 | switch (sk->sk_state) { | |
1418 | case IUCV_OPEN: | |
1419 | case IUCV_BOUND: | |
1420 | if (val < 1 || val > (u16)(~0)) | |
1421 | rc = -EINVAL; | |
1422 | else | |
1423 | iucv->msglimit = val; | |
1424 | break; | |
1425 | default: | |
1426 | rc = -EINVAL; | |
1427 | break; | |
1428 | } | |
1429 | break; | |
9d5c5d8f HB |
1430 | default: |
1431 | rc = -ENOPROTOOPT; | |
1432 | break; | |
1433 | } | |
1434 | release_sock(sk); | |
1435 | ||
1436 | return rc; | |
1437 | } | |
1438 | ||
1439 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1440 | char __user *optval, int __user *optlen) | |
1441 | { | |
1442 | struct sock *sk = sock->sk; | |
1443 | struct iucv_sock *iucv = iucv_sk(sk); | |
1444 | int val, len; | |
1445 | ||
1446 | if (level != SOL_IUCV) | |
1447 | return -ENOPROTOOPT; | |
1448 | ||
1449 | if (get_user(len, optlen)) | |
1450 | return -EFAULT; | |
1451 | ||
1452 | if (len < 0) | |
1453 | return -EINVAL; | |
1454 | ||
1455 | len = min_t(unsigned int, len, sizeof(int)); | |
1456 | ||
1457 | switch (optname) { | |
1458 | case SO_IPRMDATA_MSG: | |
1459 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1460 | break; | |
09488e2e HB |
1461 | case SO_MSGLIMIT: |
1462 | lock_sock(sk); | |
1463 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1464 | : iucv->msglimit; /* default */ | |
1465 | release_sock(sk); | |
1466 | break; | |
9d5c5d8f HB |
1467 | default: |
1468 | return -ENOPROTOOPT; | |
1469 | } | |
1470 | ||
1471 | if (put_user(len, optlen)) | |
1472 | return -EFAULT; | |
1473 | if (copy_to_user(optval, &val, len)) | |
1474 | return -EFAULT; | |
1475 | ||
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | ||
eac3731b JH |
1480 | /* Callback wrappers - called from iucv base support */ |
1481 | static int iucv_callback_connreq(struct iucv_path *path, | |
1482 | u8 ipvmid[8], u8 ipuser[16]) | |
1483 | { | |
1484 | unsigned char user_data[16]; | |
1485 | unsigned char nuser_data[16]; | |
1486 | unsigned char src_name[8]; | |
1487 | struct hlist_node *node; | |
1488 | struct sock *sk, *nsk; | |
1489 | struct iucv_sock *iucv, *niucv; | |
1490 | int err; | |
1491 | ||
1492 | memcpy(src_name, ipuser, 8); | |
1493 | EBCASC(src_name, 8); | |
1494 | /* Find out if this path belongs to af_iucv. */ | |
1495 | read_lock(&iucv_sk_list.lock); | |
1496 | iucv = NULL; | |
febca281 | 1497 | sk = NULL; |
eac3731b JH |
1498 | sk_for_each(sk, node, &iucv_sk_list.head) |
1499 | if (sk->sk_state == IUCV_LISTEN && | |
1500 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1501 | /* | |
1502 | * Found a listening socket with | |
1503 | * src_name == ipuser[0-7]. | |
1504 | */ | |
1505 | iucv = iucv_sk(sk); | |
1506 | break; | |
1507 | } | |
1508 | read_unlock(&iucv_sk_list.lock); | |
1509 | if (!iucv) | |
1510 | /* No socket found, not one of our paths. */ | |
1511 | return -EINVAL; | |
1512 | ||
1513 | bh_lock_sock(sk); | |
1514 | ||
1515 | /* Check if parent socket is listening */ | |
1516 | low_nmcpy(user_data, iucv->src_name); | |
1517 | high_nmcpy(user_data, iucv->dst_name); | |
1518 | ASCEBC(user_data, sizeof(user_data)); | |
1519 | if (sk->sk_state != IUCV_LISTEN) { | |
1520 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1521 | iucv_path_free(path); |
eac3731b JH |
1522 | goto fail; |
1523 | } | |
1524 | ||
1525 | /* Check for backlog size */ | |
1526 | if (sk_acceptq_is_full(sk)) { | |
1527 | err = iucv_path_sever(path, user_data); | |
65dbd7c2 | 1528 | iucv_path_free(path); |
eac3731b JH |
1529 | goto fail; |
1530 | } | |
1531 | ||
1532 | /* Create the new socket */ | |
aa8e71f5 | 1533 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
da99f056 | 1534 | if (!nsk) { |
eac3731b | 1535 | err = iucv_path_sever(path, user_data); |
65dbd7c2 | 1536 | iucv_path_free(path); |
eac3731b JH |
1537 | goto fail; |
1538 | } | |
1539 | ||
1540 | niucv = iucv_sk(nsk); | |
1541 | iucv_sock_init(nsk, sk); | |
1542 | ||
1543 | /* Set the new iucv_sock */ | |
1544 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1545 | EBCASC(niucv->dst_name, 8); | |
1546 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1547 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1548 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1549 | niucv->path = path; | |
1550 | ||
1551 | /* Call iucv_accept */ | |
1552 | high_nmcpy(nuser_data, ipuser + 8); | |
1553 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1554 | ASCEBC(nuser_data + 8, 8); | |
1555 | ||
09488e2e HB |
1556 | /* set message limit for path based on msglimit of accepting socket */ |
1557 | niucv->msglimit = iucv->msglimit; | |
1558 | path->msglim = iucv->msglimit; | |
eac3731b | 1559 | err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1560 | if (err) { |
eac3731b | 1561 | err = iucv_path_sever(path, user_data); |
65dbd7c2 HB |
1562 | iucv_path_free(path); |
1563 | iucv_sock_kill(nsk); | |
eac3731b JH |
1564 | goto fail; |
1565 | } | |
1566 | ||
1567 | iucv_accept_enqueue(sk, nsk); | |
1568 | ||
1569 | /* Wake up accept */ | |
1570 | nsk->sk_state = IUCV_CONNECTED; | |
1571 | sk->sk_data_ready(sk, 1); | |
1572 | err = 0; | |
1573 | fail: | |
1574 | bh_unlock_sock(sk); | |
1575 | return 0; | |
1576 | } | |
1577 | ||
1578 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1579 | { | |
1580 | struct sock *sk = path->private; | |
1581 | ||
1582 | sk->sk_state = IUCV_CONNECTED; | |
1583 | sk->sk_state_change(sk); | |
1584 | } | |
1585 | ||
1586 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1587 | { | |
1588 | struct sock *sk = path->private; | |
561e0360 | 1589 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1590 | struct sk_buff *skb; |
1591 | struct sock_msg_q *save_msg; | |
1592 | int len; | |
561e0360 | 1593 | |
fe86e54e HB |
1594 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
1595 | iucv_message_reject(path, msg); | |
eac3731b | 1596 | return; |
fe86e54e | 1597 | } |
eac3731b | 1598 | |
3fa6b5ad | 1599 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1600 | |
f0703c80 UB |
1601 | if (!list_empty(&iucv->message_q.list) || |
1602 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1603 | goto save_message; | |
1604 | ||
1605 | len = atomic_read(&sk->sk_rmem_alloc); | |
b8942e3b | 1606 | len += iucv_msg_length(msg) + sizeof(struct sk_buff); |
f0703c80 UB |
1607 | if (len > sk->sk_rcvbuf) |
1608 | goto save_message; | |
1609 | ||
b8942e3b | 1610 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1611 | if (!skb) |
1612 | goto save_message; | |
eac3731b | 1613 | |
f0703c80 | 1614 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1615 | goto out_unlock; |
eac3731b | 1616 | |
f0703c80 UB |
1617 | save_message: |
1618 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 UB |
1619 | if (!save_msg) |
1620 | return; | |
f0703c80 UB |
1621 | save_msg->path = path; |
1622 | save_msg->msg = *msg; | |
eac3731b | 1623 | |
f0703c80 | 1624 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1625 | |
1626 | out_unlock: | |
f0703c80 | 1627 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1628 | } |
1629 | ||
1630 | static void iucv_callback_txdone(struct iucv_path *path, | |
1631 | struct iucv_message *msg) | |
1632 | { | |
1633 | struct sock *sk = path->private; | |
f2a77991 | 1634 | struct sk_buff *this = NULL; |
eac3731b JH |
1635 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1636 | struct sk_buff *list_skb = list->next; | |
1637 | unsigned long flags; | |
1638 | ||
f2a77991 | 1639 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1640 | spin_lock_irqsave(&list->lock, flags); |
1641 | ||
f2a77991 | 1642 | while (list_skb != (struct sk_buff *)list) { |
44b1e6b5 | 1643 | if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { |
f2a77991 UB |
1644 | this = list_skb; |
1645 | break; | |
1646 | } | |
561e0360 | 1647 | list_skb = list_skb->next; |
f2a77991 UB |
1648 | } |
1649 | if (this) | |
1650 | __skb_unlink(this, list); | |
561e0360 JH |
1651 | |
1652 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1653 | |
0ea920d2 HB |
1654 | if (this) { |
1655 | kfree_skb(this); | |
1656 | /* wake up any process waiting for sending */ | |
1657 | iucv_sock_wake_msglim(sk); | |
1658 | } | |
561e0360 | 1659 | } |
c2b4afd2 | 1660 | BUG_ON(!this); |
eac3731b | 1661 | |
da99f056 | 1662 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1663 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1664 | sk->sk_state = IUCV_CLOSED; | |
1665 | sk->sk_state_change(sk); | |
1666 | } | |
1667 | } | |
eac3731b | 1668 | |
eac3731b JH |
1669 | } |
1670 | ||
1671 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1672 | { | |
1673 | struct sock *sk = path->private; | |
1674 | ||
1675 | if (!list_empty(&iucv_sk(sk)->accept_q)) | |
1676 | sk->sk_state = IUCV_SEVERED; | |
1677 | else | |
1678 | sk->sk_state = IUCV_DISCONN; | |
1679 | ||
1680 | sk->sk_state_change(sk); | |
1681 | } | |
1682 | ||
af88b52d HB |
1683 | /* called if the other communication side shuts down its RECV direction; |
1684 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1685 | */ | |
1686 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1687 | { | |
1688 | struct sock *sk = path->private; | |
1689 | ||
1690 | bh_lock_sock(sk); | |
1691 | if (sk->sk_state != IUCV_CLOSED) { | |
1692 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1693 | sk->sk_state_change(sk); | |
1694 | } | |
1695 | bh_unlock_sock(sk); | |
1696 | } | |
1697 | ||
5708e868 | 1698 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
1699 | .family = PF_IUCV, |
1700 | .owner = THIS_MODULE, | |
1701 | .release = iucv_sock_release, | |
1702 | .bind = iucv_sock_bind, | |
1703 | .connect = iucv_sock_connect, | |
1704 | .listen = iucv_sock_listen, | |
1705 | .accept = iucv_sock_accept, | |
1706 | .getname = iucv_sock_getname, | |
1707 | .sendmsg = iucv_sock_sendmsg, | |
1708 | .recvmsg = iucv_sock_recvmsg, | |
1709 | .poll = iucv_sock_poll, | |
1710 | .ioctl = sock_no_ioctl, | |
1711 | .mmap = sock_no_mmap, | |
1712 | .socketpair = sock_no_socketpair, | |
1713 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
1714 | .setsockopt = iucv_sock_setsockopt, |
1715 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
1716 | }; |
1717 | ||
ec1b4cf7 | 1718 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
1719 | .family = AF_IUCV, |
1720 | .owner = THIS_MODULE, | |
1721 | .create = iucv_sock_create, | |
1722 | }; | |
1723 | ||
da99f056 | 1724 | static int __init afiucv_init(void) |
eac3731b JH |
1725 | { |
1726 | int err; | |
1727 | ||
1728 | if (!MACHINE_IS_VM) { | |
8f7c502c UB |
1729 | pr_err("The af_iucv module cannot be loaded" |
1730 | " without z/VM\n"); | |
eac3731b JH |
1731 | err = -EPROTONOSUPPORT; |
1732 | goto out; | |
1733 | } | |
1734 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
1735 | if (unlikely(err)) { | |
c2b4afd2 | 1736 | WARN_ON(err); |
eac3731b JH |
1737 | err = -EPROTONOSUPPORT; |
1738 | goto out; | |
1739 | } | |
1740 | ||
1741 | err = iucv_register(&af_iucv_handler, 0); | |
1742 | if (err) | |
1743 | goto out; | |
1744 | err = proto_register(&iucv_proto, 0); | |
1745 | if (err) | |
1746 | goto out_iucv; | |
1747 | err = sock_register(&iucv_sock_family_ops); | |
1748 | if (err) | |
1749 | goto out_proto; | |
c23cad92 UB |
1750 | /* establish dummy device */ |
1751 | err = driver_register(&af_iucv_driver); | |
1752 | if (err) | |
1753 | goto out_sock; | |
1754 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
1755 | if (!af_iucv_dev) { | |
1756 | err = -ENOMEM; | |
1757 | goto out_driver; | |
1758 | } | |
1759 | dev_set_name(af_iucv_dev, "af_iucv"); | |
1760 | af_iucv_dev->bus = &iucv_bus; | |
1761 | af_iucv_dev->parent = iucv_root; | |
1762 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
1763 | af_iucv_dev->driver = &af_iucv_driver; | |
1764 | err = device_register(af_iucv_dev); | |
1765 | if (err) | |
1766 | goto out_driver; | |
1767 | ||
eac3731b JH |
1768 | return 0; |
1769 | ||
c23cad92 UB |
1770 | out_driver: |
1771 | driver_unregister(&af_iucv_driver); | |
1772 | out_sock: | |
1773 | sock_unregister(PF_IUCV); | |
eac3731b JH |
1774 | out_proto: |
1775 | proto_unregister(&iucv_proto); | |
1776 | out_iucv: | |
1777 | iucv_unregister(&af_iucv_handler, 0); | |
1778 | out: | |
1779 | return err; | |
1780 | } | |
1781 | ||
1782 | static void __exit afiucv_exit(void) | |
1783 | { | |
c23cad92 UB |
1784 | device_unregister(af_iucv_dev); |
1785 | driver_unregister(&af_iucv_driver); | |
eac3731b JH |
1786 | sock_unregister(PF_IUCV); |
1787 | proto_unregister(&iucv_proto); | |
1788 | iucv_unregister(&af_iucv_handler, 0); | |
eac3731b JH |
1789 | } |
1790 | ||
1791 | module_init(afiucv_init); | |
1792 | module_exit(afiucv_exit); | |
1793 | ||
1794 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
1795 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
1796 | MODULE_VERSION(VERSION); | |
1797 | MODULE_LICENSE("GPL"); | |
1798 | MODULE_ALIAS_NETPROTO(PF_IUCV); |