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 | ||
eac3731b JH |
30 | #include <net/iucv/af_iucv.h> |
31 | ||
3881ac44 | 32 | #define VERSION "1.2" |
eac3731b JH |
33 | |
34 | static char iucv_userid[80]; | |
35 | ||
5708e868 | 36 | static const struct proto_ops iucv_sock_ops; |
eac3731b JH |
37 | |
38 | static struct proto iucv_proto = { | |
39 | .name = "AF_IUCV", | |
40 | .owner = THIS_MODULE, | |
41 | .obj_size = sizeof(struct iucv_sock), | |
42 | }; | |
43 | ||
6fcd61f7 FB |
44 | static struct iucv_interface *pr_iucv; |
45 | ||
b8942e3b HB |
46 | /* special AF_IUCV IPRM messages */ |
47 | static const u8 iprm_shutdown[8] = | |
48 | {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; | |
49 | ||
44b1e6b5 HB |
50 | #define TRGCLS_SIZE (sizeof(((struct iucv_message *)0)->class)) |
51 | ||
0ea920d2 HB |
52 | #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
53 | do { \ | |
54 | DEFINE_WAIT(__wait); \ | |
55 | long __timeo = timeo; \ | |
56 | ret = 0; \ | |
aa395145 | 57 | prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
0ea920d2 | 58 | while (!(condition)) { \ |
0ea920d2 HB |
59 | if (!__timeo) { \ |
60 | ret = -EAGAIN; \ | |
61 | break; \ | |
62 | } \ | |
63 | if (signal_pending(current)) { \ | |
64 | ret = sock_intr_errno(__timeo); \ | |
65 | break; \ | |
66 | } \ | |
67 | release_sock(sk); \ | |
68 | __timeo = schedule_timeout(__timeo); \ | |
69 | lock_sock(sk); \ | |
70 | ret = sock_error(sk); \ | |
71 | if (ret) \ | |
72 | break; \ | |
73 | } \ | |
aa395145 | 74 | finish_wait(sk_sleep(sk), &__wait); \ |
0ea920d2 HB |
75 | } while (0) |
76 | ||
77 | #define iucv_sock_wait(sk, condition, timeo) \ | |
78 | ({ \ | |
79 | int __ret = 0; \ | |
80 | if (!(condition)) \ | |
81 | __iucv_sock_wait(sk, condition, timeo, __ret); \ | |
82 | __ret; \ | |
83 | }) | |
44b1e6b5 | 84 | |
57f20448 HC |
85 | static void iucv_sock_kill(struct sock *sk); |
86 | static void iucv_sock_close(struct sock *sk); | |
7d316b94 | 87 | static void iucv_sever_path(struct sock *, int); |
57f20448 | 88 | |
3881ac44 UB |
89 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, |
90 | struct packet_type *pt, struct net_device *orig_dev); | |
91 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
92 | struct sk_buff *skb, u8 flags); | |
93 | static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); | |
94 | ||
eac3731b JH |
95 | /* Call Back functions */ |
96 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
97 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
91e60eb6 UB |
98 | static void iucv_callback_connack(struct iucv_path *, u8 *); |
99 | static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *); | |
100 | static void iucv_callback_connrej(struct iucv_path *, u8 *); | |
101 | static void iucv_callback_shutdown(struct iucv_path *, u8 *); | |
eac3731b JH |
102 | |
103 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 104 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
105 | .autobind_name = ATOMIC_INIT(0) |
106 | }; | |
107 | ||
108 | static struct iucv_handler af_iucv_handler = { | |
109 | .path_pending = iucv_callback_connreq, | |
110 | .path_complete = iucv_callback_connack, | |
111 | .path_severed = iucv_callback_connrej, | |
112 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
113 | .message_complete = iucv_callback_txdone, |
114 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
115 | }; |
116 | ||
117 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
118 | { | |
119 | memcpy(dst, src, 8); | |
120 | } | |
121 | ||
122 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
123 | { | |
124 | memcpy(&dst[8], src, 8); | |
125 | } | |
126 | ||
c23cad92 UB |
127 | static int afiucv_pm_prepare(struct device *dev) |
128 | { | |
129 | #ifdef CONFIG_PM_DEBUG | |
130 | printk(KERN_WARNING "afiucv_pm_prepare\n"); | |
131 | #endif | |
132 | return 0; | |
133 | } | |
134 | ||
135 | static void afiucv_pm_complete(struct device *dev) | |
136 | { | |
137 | #ifdef CONFIG_PM_DEBUG | |
138 | printk(KERN_WARNING "afiucv_pm_complete\n"); | |
139 | #endif | |
c23cad92 UB |
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; | |
c23cad92 UB |
152 | int err = 0; |
153 | ||
154 | #ifdef CONFIG_PM_DEBUG | |
155 | printk(KERN_WARNING "afiucv_pm_freeze\n"); | |
156 | #endif | |
157 | read_lock(&iucv_sk_list.lock); | |
b67bfe0d | 158 | sk_for_each(sk, &iucv_sk_list.head) { |
c23cad92 | 159 | iucv = iucv_sk(sk); |
c23cad92 | 160 | switch (sk->sk_state) { |
c23cad92 UB |
161 | case IUCV_DISCONN: |
162 | case IUCV_CLOSING: | |
163 | case IUCV_CONNECTED: | |
7d316b94 | 164 | iucv_sever_path(sk, 0); |
c23cad92 UB |
165 | break; |
166 | case IUCV_OPEN: | |
167 | case IUCV_BOUND: | |
168 | case IUCV_LISTEN: | |
169 | case IUCV_CLOSED: | |
170 | default: | |
171 | break; | |
172 | } | |
7d316b94 UB |
173 | skb_queue_purge(&iucv->send_skb_q); |
174 | skb_queue_purge(&iucv->backlog_skb_q); | |
c23cad92 UB |
175 | } |
176 | read_unlock(&iucv_sk_list.lock); | |
177 | return err; | |
178 | } | |
179 | ||
180 | /** | |
181 | * afiucv_pm_restore_thaw() - Thaw and restore PM callback | |
182 | * @dev: AFIUCV dummy device | |
183 | * | |
184 | * socket clean up after freeze | |
185 | */ | |
186 | static int afiucv_pm_restore_thaw(struct device *dev) | |
187 | { | |
c23cad92 | 188 | struct sock *sk; |
c23cad92 UB |
189 | |
190 | #ifdef CONFIG_PM_DEBUG | |
191 | printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); | |
192 | #endif | |
193 | read_lock(&iucv_sk_list.lock); | |
b67bfe0d | 194 | sk_for_each(sk, &iucv_sk_list.head) { |
c23cad92 UB |
195 | switch (sk->sk_state) { |
196 | case IUCV_CONNECTED: | |
197 | sk->sk_err = EPIPE; | |
198 | sk->sk_state = IUCV_DISCONN; | |
199 | sk->sk_state_change(sk); | |
200 | break; | |
201 | case IUCV_DISCONN: | |
c23cad92 UB |
202 | case IUCV_CLOSING: |
203 | case IUCV_LISTEN: | |
204 | case IUCV_BOUND: | |
205 | case IUCV_OPEN: | |
206 | default: | |
207 | break; | |
208 | } | |
209 | } | |
210 | read_unlock(&iucv_sk_list.lock); | |
211 | return 0; | |
212 | } | |
213 | ||
47145210 | 214 | static const struct dev_pm_ops afiucv_pm_ops = { |
c23cad92 UB |
215 | .prepare = afiucv_pm_prepare, |
216 | .complete = afiucv_pm_complete, | |
217 | .freeze = afiucv_pm_freeze, | |
218 | .thaw = afiucv_pm_restore_thaw, | |
219 | .restore = afiucv_pm_restore_thaw, | |
220 | }; | |
221 | ||
222 | static struct device_driver af_iucv_driver = { | |
223 | .owner = THIS_MODULE, | |
224 | .name = "afiucv", | |
6fcd61f7 | 225 | .bus = NULL, |
c23cad92 UB |
226 | .pm = &afiucv_pm_ops, |
227 | }; | |
228 | ||
229 | /* dummy device used as trigger for PM functions */ | |
230 | static struct device *af_iucv_dev; | |
231 | ||
b8942e3b HB |
232 | /** |
233 | * iucv_msg_length() - Returns the length of an iucv message. | |
234 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
235 | * | |
236 | * The function returns the length of the specified iucv message @msg of data | |
237 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
238 | * | |
239 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
240 | * data: | |
241 | * PRMDATA[0..6] socket data (max 7 bytes); | |
242 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
243 | * | |
25985edc | 244 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
245 | * value from 0xFF. |
246 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
247 | * notifications (see iucv_sock_shutdown); and further, | |
248 | * if the socket data len is > 7, the function returns 8. | |
249 | * | |
250 | * Use this function to allocate socket buffers to store iucv message data. | |
251 | */ | |
252 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
253 | { | |
254 | size_t datalen; | |
255 | ||
256 | if (msg->flags & IUCV_IPRMDATA) { | |
257 | datalen = 0xff - msg->rmmsg[7]; | |
258 | return (datalen < 8) ? datalen : 8; | |
259 | } | |
260 | return msg->length; | |
261 | } | |
262 | ||
0ea920d2 HB |
263 | /** |
264 | * iucv_sock_in_state() - check for specific states | |
265 | * @sk: sock structure | |
266 | * @state: first iucv sk state | |
267 | * @state: second iucv sk state | |
268 | * | |
269 | * Returns true if the socket in either in the first or second state. | |
270 | */ | |
271 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
272 | { | |
273 | return (sk->sk_state == state || sk->sk_state == state2); | |
274 | } | |
275 | ||
276 | /** | |
277 | * iucv_below_msglim() - function to check if messages can be sent | |
278 | * @sk: sock structure | |
279 | * | |
280 | * Returns true if the send queue length is lower than the message limit. | |
281 | * Always returns true if the socket is not connected (no iucv path for | |
282 | * checking the message limit). | |
283 | */ | |
284 | static inline int iucv_below_msglim(struct sock *sk) | |
285 | { | |
286 | struct iucv_sock *iucv = iucv_sk(sk); | |
287 | ||
288 | if (sk->sk_state != IUCV_CONNECTED) | |
289 | return 1; | |
3881ac44 UB |
290 | if (iucv->transport == AF_IUCV_TRANS_IUCV) |
291 | return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); | |
292 | else | |
293 | return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && | |
294 | (atomic_read(&iucv->pendings) <= 0)); | |
0ea920d2 HB |
295 | } |
296 | ||
297 | /** | |
298 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
299 | */ | |
300 | static void iucv_sock_wake_msglim(struct sock *sk) | |
301 | { | |
43815482 ED |
302 | struct socket_wq *wq; |
303 | ||
304 | rcu_read_lock(); | |
305 | wq = rcu_dereference(sk->sk_wq); | |
306 | if (wq_has_sleeper(wq)) | |
307 | wake_up_interruptible_all(&wq->wait); | |
0ea920d2 | 308 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 309 | rcu_read_unlock(); |
0ea920d2 HB |
310 | } |
311 | ||
3881ac44 UB |
312 | /** |
313 | * afiucv_hs_send() - send a message through HiperSockets transport | |
314 | */ | |
315 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
316 | struct sk_buff *skb, u8 flags) | |
317 | { | |
3881ac44 UB |
318 | struct iucv_sock *iucv = iucv_sk(sock); |
319 | struct af_iucv_trans_hdr *phs_hdr; | |
320 | struct sk_buff *nskb; | |
321 | int err, confirm_recv = 0; | |
322 | ||
323 | memset(skb->head, 0, ETH_HLEN); | |
324 | phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, | |
325 | sizeof(struct af_iucv_trans_hdr)); | |
326 | skb_reset_mac_header(skb); | |
327 | skb_reset_network_header(skb); | |
328 | skb_push(skb, ETH_HLEN); | |
329 | skb_reset_mac_header(skb); | |
330 | memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); | |
331 | ||
332 | phs_hdr->magic = ETH_P_AF_IUCV; | |
333 | phs_hdr->version = 1; | |
334 | phs_hdr->flags = flags; | |
335 | if (flags == AF_IUCV_FLAG_SYN) | |
336 | phs_hdr->window = iucv->msglimit; | |
337 | else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { | |
338 | confirm_recv = atomic_read(&iucv->msg_recv); | |
339 | phs_hdr->window = confirm_recv; | |
340 | if (confirm_recv) | |
341 | phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; | |
342 | } | |
343 | memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); | |
344 | memcpy(phs_hdr->destAppName, iucv->dst_name, 8); | |
345 | memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); | |
346 | memcpy(phs_hdr->srcAppName, iucv->src_name, 8); | |
347 | ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); | |
348 | ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); | |
349 | ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); | |
350 | ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); | |
351 | if (imsg) | |
352 | memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); | |
353 | ||
800c5eb7 | 354 | skb->dev = iucv->hs_dev; |
3881ac44 UB |
355 | if (!skb->dev) |
356 | return -ENODEV; | |
800c5eb7 | 357 | if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) |
3881ac44 UB |
358 | return -ENETDOWN; |
359 | if (skb->len > skb->dev->mtu) { | |
360 | if (sock->sk_type == SOCK_SEQPACKET) | |
361 | return -EMSGSIZE; | |
362 | else | |
363 | skb_trim(skb, skb->dev->mtu); | |
364 | } | |
365 | skb->protocol = ETH_P_AF_IUCV; | |
3881ac44 UB |
366 | nskb = skb_clone(skb, GFP_ATOMIC); |
367 | if (!nskb) | |
368 | return -ENOMEM; | |
369 | skb_queue_tail(&iucv->send_skb_q, nskb); | |
370 | err = dev_queue_xmit(skb); | |
800c5eb7 | 371 | if (net_xmit_eval(err)) { |
3881ac44 UB |
372 | skb_unlink(nskb, &iucv->send_skb_q); |
373 | kfree_skb(nskb); | |
374 | } else { | |
375 | atomic_sub(confirm_recv, &iucv->msg_recv); | |
376 | WARN_ON(atomic_read(&iucv->msg_recv) < 0); | |
377 | } | |
800c5eb7 | 378 | return net_xmit_eval(err); |
3881ac44 UB |
379 | } |
380 | ||
eac3731b JH |
381 | static struct sock *__iucv_get_sock_by_name(char *nm) |
382 | { | |
383 | struct sock *sk; | |
eac3731b | 384 | |
b67bfe0d | 385 | sk_for_each(sk, &iucv_sk_list.head) |
eac3731b JH |
386 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) |
387 | return sk; | |
388 | ||
389 | return NULL; | |
390 | } | |
391 | ||
392 | static void iucv_sock_destruct(struct sock *sk) | |
393 | { | |
394 | skb_queue_purge(&sk->sk_receive_queue); | |
82492a35 UB |
395 | skb_queue_purge(&sk->sk_error_queue); |
396 | ||
397 | sk_mem_reclaim(sk); | |
398 | ||
399 | if (!sock_flag(sk, SOCK_DEAD)) { | |
400 | pr_err("Attempt to release alive iucv socket %p\n", sk); | |
401 | return; | |
402 | } | |
403 | ||
404 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); | |
405 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); | |
406 | WARN_ON(sk->sk_wmem_queued); | |
407 | WARN_ON(sk->sk_forward_alloc); | |
eac3731b JH |
408 | } |
409 | ||
410 | /* Cleanup Listen */ | |
411 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
412 | { | |
413 | struct sock *sk; | |
414 | ||
415 | /* Close non-accepted connections */ | |
416 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
417 | iucv_sock_close(sk); | |
418 | iucv_sock_kill(sk); | |
419 | } | |
420 | ||
421 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
422 | } |
423 | ||
7514bab0 | 424 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
425 | static void iucv_sock_kill(struct sock *sk) |
426 | { | |
427 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
428 | return; | |
429 | ||
430 | iucv_sock_unlink(&iucv_sk_list, sk); | |
431 | sock_set_flag(sk, SOCK_DEAD); | |
432 | sock_put(sk); | |
433 | } | |
434 | ||
7d316b94 UB |
435 | /* Terminate an IUCV path */ |
436 | static void iucv_sever_path(struct sock *sk, int with_user_data) | |
437 | { | |
438 | unsigned char user_data[16]; | |
439 | struct iucv_sock *iucv = iucv_sk(sk); | |
440 | struct iucv_path *path = iucv->path; | |
441 | ||
442 | if (iucv->path) { | |
443 | iucv->path = NULL; | |
444 | if (with_user_data) { | |
445 | low_nmcpy(user_data, iucv->src_name); | |
446 | high_nmcpy(user_data, iucv->dst_name); | |
447 | ASCEBC(user_data, sizeof(user_data)); | |
448 | pr_iucv->path_sever(path, user_data); | |
449 | } else | |
450 | pr_iucv->path_sever(path, NULL); | |
451 | iucv_path_free(path); | |
452 | } | |
453 | } | |
454 | ||
9fbd87d4 UB |
455 | /* Send FIN through an IUCV socket for HIPER transport */ |
456 | static int iucv_send_ctrl(struct sock *sk, u8 flags) | |
457 | { | |
458 | int err = 0; | |
459 | int blen; | |
460 | struct sk_buff *skb; | |
461 | ||
462 | blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
463 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
464 | if (skb) { | |
465 | skb_reserve(skb, blen); | |
466 | err = afiucv_hs_send(NULL, sk, skb, flags); | |
467 | } | |
468 | return err; | |
469 | } | |
470 | ||
eac3731b JH |
471 | /* Close an IUCV socket */ |
472 | static void iucv_sock_close(struct sock *sk) | |
473 | { | |
eac3731b | 474 | struct iucv_sock *iucv = iucv_sk(sk); |
561e0360 | 475 | unsigned long timeo; |
800c5eb7 | 476 | int err = 0; |
eac3731b | 477 | |
eac3731b JH |
478 | lock_sock(sk); |
479 | ||
da99f056 | 480 | switch (sk->sk_state) { |
eac3731b JH |
481 | case IUCV_LISTEN: |
482 | iucv_sock_cleanup_listen(sk); | |
483 | break; | |
484 | ||
485 | case IUCV_CONNECTED: | |
3881ac44 | 486 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
9fbd87d4 | 487 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); |
3881ac44 UB |
488 | sk->sk_state = IUCV_DISCONN; |
489 | sk->sk_state_change(sk); | |
490 | } | |
816abbad | 491 | case IUCV_DISCONN: /* fall through */ |
561e0360 JH |
492 | sk->sk_state = IUCV_CLOSING; |
493 | sk->sk_state_change(sk); | |
494 | ||
800c5eb7 | 495 | if (!err && !skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
496 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
497 | timeo = sk->sk_lingertime; | |
498 | else | |
499 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 500 | iucv_sock_wait(sk, |
0ea920d2 HB |
501 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
502 | timeo); | |
561e0360 JH |
503 | } |
504 | ||
bbe188c8 | 505 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
506 | sk->sk_state = IUCV_CLOSED; |
507 | sk->sk_state_change(sk); | |
508 | ||
eac3731b JH |
509 | sk->sk_err = ECONNRESET; |
510 | sk->sk_state_change(sk); | |
511 | ||
800c5eb7 | 512 | skb_queue_purge(&iucv->send_skb_q); |
561e0360 | 513 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b | 514 | |
7d316b94 UB |
515 | default: /* fall through */ |
516 | iucv_sever_path(sk, 1); | |
3ff50b79 | 517 | } |
eac3731b | 518 | |
800c5eb7 UB |
519 | if (iucv->hs_dev) { |
520 | dev_put(iucv->hs_dev); | |
521 | iucv->hs_dev = NULL; | |
522 | sk->sk_bound_dev_if = 0; | |
523 | } | |
524 | ||
7514bab0 HB |
525 | /* mark socket for deletion by iucv_sock_kill() */ |
526 | sock_set_flag(sk, SOCK_ZAPPED); | |
527 | ||
eac3731b | 528 | release_sock(sk); |
eac3731b JH |
529 | } |
530 | ||
531 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
532 | { | |
533 | if (parent) | |
534 | sk->sk_type = parent->sk_type; | |
535 | } | |
536 | ||
11aa9c28 | 537 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) |
eac3731b JH |
538 | { |
539 | struct sock *sk; | |
493d3971 | 540 | struct iucv_sock *iucv; |
eac3731b | 541 | |
11aa9c28 | 542 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); |
eac3731b JH |
543 | if (!sk) |
544 | return NULL; | |
493d3971 | 545 | iucv = iucv_sk(sk); |
eac3731b JH |
546 | |
547 | sock_init_data(sock, sk); | |
493d3971 UB |
548 | INIT_LIST_HEAD(&iucv->accept_q); |
549 | spin_lock_init(&iucv->accept_q_lock); | |
550 | skb_queue_head_init(&iucv->send_skb_q); | |
551 | INIT_LIST_HEAD(&iucv->message_q.list); | |
552 | spin_lock_init(&iucv->message_q.lock); | |
553 | skb_queue_head_init(&iucv->backlog_skb_q); | |
554 | iucv->send_tag = 0; | |
3881ac44 | 555 | atomic_set(&iucv->pendings, 0); |
493d3971 | 556 | iucv->flags = 0; |
3881ac44 UB |
557 | iucv->msglimit = 0; |
558 | atomic_set(&iucv->msg_sent, 0); | |
559 | atomic_set(&iucv->msg_recv, 0); | |
493d3971 | 560 | iucv->path = NULL; |
3881ac44 | 561 | iucv->sk_txnotify = afiucv_hs_callback_txnotify; |
493d3971 | 562 | memset(&iucv->src_user_id , 0, 32); |
3881ac44 UB |
563 | if (pr_iucv) |
564 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
565 | else | |
566 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
eac3731b JH |
567 | |
568 | sk->sk_destruct = iucv_sock_destruct; | |
569 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
570 | sk->sk_allocation = GFP_DMA; | |
571 | ||
572 | sock_reset_flag(sk, SOCK_ZAPPED); | |
573 | ||
574 | sk->sk_protocol = proto; | |
575 | sk->sk_state = IUCV_OPEN; | |
576 | ||
eac3731b JH |
577 | iucv_sock_link(&iucv_sk_list, sk); |
578 | return sk; | |
579 | } | |
580 | ||
581 | /* Create an IUCV socket */ | |
3f378b68 EP |
582 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
583 | int kern) | |
eac3731b JH |
584 | { |
585 | struct sock *sk; | |
586 | ||
aa8e71f5 HB |
587 | if (protocol && protocol != PF_IUCV) |
588 | return -EPROTONOSUPPORT; | |
eac3731b JH |
589 | |
590 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
591 | |
592 | switch (sock->type) { | |
593 | case SOCK_STREAM: | |
594 | sock->ops = &iucv_sock_ops; | |
595 | break; | |
596 | case SOCK_SEQPACKET: | |
597 | /* currently, proto ops can handle both sk types */ | |
598 | sock->ops = &iucv_sock_ops; | |
599 | break; | |
600 | default: | |
601 | return -ESOCKTNOSUPPORT; | |
602 | } | |
eac3731b | 603 | |
11aa9c28 | 604 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); |
eac3731b JH |
605 | if (!sk) |
606 | return -ENOMEM; | |
607 | ||
608 | iucv_sock_init(sk, NULL); | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
614 | { | |
615 | write_lock_bh(&l->lock); | |
616 | sk_add_node(sk, &l->head); | |
617 | write_unlock_bh(&l->lock); | |
618 | } | |
619 | ||
620 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
621 | { | |
622 | write_lock_bh(&l->lock); | |
623 | sk_del_node_init(sk); | |
624 | write_unlock_bh(&l->lock); | |
625 | } | |
626 | ||
627 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
628 | { | |
febca281 UB |
629 | unsigned long flags; |
630 | struct iucv_sock *par = iucv_sk(parent); | |
631 | ||
eac3731b | 632 | sock_hold(sk); |
febca281 UB |
633 | spin_lock_irqsave(&par->accept_q_lock, flags); |
634 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
635 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 636 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 637 | sk_acceptq_added(parent); |
eac3731b JH |
638 | } |
639 | ||
640 | void iucv_accept_unlink(struct sock *sk) | |
641 | { | |
febca281 UB |
642 | unsigned long flags; |
643 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
644 | ||
645 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 646 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 647 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 648 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
649 | iucv_sk(sk)->parent = NULL; |
650 | sock_put(sk); | |
651 | } | |
652 | ||
653 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
654 | { | |
655 | struct iucv_sock *isk, *n; | |
656 | struct sock *sk; | |
657 | ||
da99f056 | 658 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
659 | sk = (struct sock *) isk; |
660 | lock_sock(sk); | |
661 | ||
662 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 663 | iucv_accept_unlink(sk); |
febca281 | 664 | release_sock(sk); |
eac3731b JH |
665 | continue; |
666 | } | |
667 | ||
668 | if (sk->sk_state == IUCV_CONNECTED || | |
aac6399c | 669 | sk->sk_state == IUCV_DISCONN || |
eac3731b JH |
670 | !newsock) { |
671 | iucv_accept_unlink(sk); | |
672 | if (newsock) | |
673 | sock_graft(sk, newsock); | |
674 | ||
eac3731b JH |
675 | release_sock(sk); |
676 | return sk; | |
677 | } | |
678 | ||
679 | release_sock(sk); | |
680 | } | |
681 | return NULL; | |
682 | } | |
683 | ||
53a4b499 PH |
684 | static void __iucv_auto_name(struct iucv_sock *iucv) |
685 | { | |
686 | char name[12]; | |
687 | ||
688 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
689 | while (__iucv_get_sock_by_name(name)) { | |
690 | sprintf(name, "%08x", | |
691 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
692 | } | |
693 | memcpy(iucv->src_name, name, 8); | |
694 | } | |
695 | ||
eac3731b JH |
696 | /* Bind an unbound socket */ |
697 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
698 | int addr_len) | |
699 | { | |
700 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
701 | struct sock *sk = sock->sk; | |
702 | struct iucv_sock *iucv; | |
3881ac44 UB |
703 | int err = 0; |
704 | struct net_device *dev; | |
705 | char uid[9]; | |
eac3731b JH |
706 | |
707 | /* Verify the input sockaddr */ | |
708 | if (!addr || addr->sa_family != AF_IUCV) | |
709 | return -EINVAL; | |
710 | ||
711 | lock_sock(sk); | |
712 | if (sk->sk_state != IUCV_OPEN) { | |
713 | err = -EBADFD; | |
714 | goto done; | |
715 | } | |
716 | ||
717 | write_lock_bh(&iucv_sk_list.lock); | |
718 | ||
719 | iucv = iucv_sk(sk); | |
720 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
721 | err = -EADDRINUSE; | |
722 | goto done_unlock; | |
723 | } | |
3881ac44 | 724 | if (iucv->path) |
eac3731b | 725 | goto done_unlock; |
eac3731b JH |
726 | |
727 | /* Bind the socket */ | |
3881ac44 UB |
728 | if (pr_iucv) |
729 | if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) | |
730 | goto vm_bind; /* VM IUCV transport */ | |
eac3731b | 731 | |
3881ac44 UB |
732 | /* try hiper transport */ |
733 | memcpy(uid, sa->siucv_user_id, sizeof(uid)); | |
734 | ASCEBC(uid, 8); | |
735 | rcu_read_lock(); | |
736 | for_each_netdev_rcu(&init_net, dev) { | |
737 | if (!memcmp(dev->perm_addr, uid, 8)) { | |
3881ac44 | 738 | memcpy(iucv->src_user_id, sa->siucv_user_id, 8); |
53a4b499 PH |
739 | /* Check for unitialized siucv_name */ |
740 | if (strncmp(sa->siucv_name, " ", 8) == 0) | |
741 | __iucv_auto_name(iucv); | |
742 | else | |
743 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
816abbad | 744 | sk->sk_bound_dev_if = dev->ifindex; |
800c5eb7 UB |
745 | iucv->hs_dev = dev; |
746 | dev_hold(dev); | |
3881ac44 UB |
747 | sk->sk_state = IUCV_BOUND; |
748 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
749 | if (!iucv->msglimit) | |
750 | iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; | |
751 | rcu_read_unlock(); | |
752 | goto done_unlock; | |
753 | } | |
754 | } | |
755 | rcu_read_unlock(); | |
756 | vm_bind: | |
757 | if (pr_iucv) { | |
758 | /* use local userid for backward compat */ | |
759 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
760 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
761 | sk->sk_state = IUCV_BOUND; | |
762 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
763 | if (!iucv->msglimit) | |
764 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
765 | goto done_unlock; | |
766 | } | |
767 | /* found no dev to bind */ | |
768 | err = -ENODEV; | |
eac3731b JH |
769 | done_unlock: |
770 | /* Release the socket list lock */ | |
771 | write_unlock_bh(&iucv_sk_list.lock); | |
772 | done: | |
773 | release_sock(sk); | |
774 | return err; | |
775 | } | |
776 | ||
777 | /* Automatically bind an unbound socket */ | |
778 | static int iucv_sock_autobind(struct sock *sk) | |
779 | { | |
780 | struct iucv_sock *iucv = iucv_sk(sk); | |
eac3731b JH |
781 | int err = 0; |
782 | ||
aac6399c | 783 | if (unlikely(!pr_iucv)) |
eac3731b JH |
784 | return -EPROTO; |
785 | ||
aac6399c | 786 | memcpy(iucv->src_user_id, iucv_userid, 8); |
eac3731b JH |
787 | |
788 | write_lock_bh(&iucv_sk_list.lock); | |
53a4b499 | 789 | __iucv_auto_name(iucv); |
eac3731b JH |
790 | write_unlock_bh(&iucv_sk_list.lock); |
791 | ||
3881ac44 UB |
792 | if (!iucv->msglimit) |
793 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
794 | ||
eac3731b JH |
795 | return err; |
796 | } | |
797 | ||
3881ac44 | 798 | static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) |
eac3731b JH |
799 | { |
800 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
801 | struct sock *sk = sock->sk; | |
493d3971 | 802 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
803 | unsigned char user_data[16]; |
804 | int err; | |
805 | ||
eac3731b | 806 | high_nmcpy(user_data, sa->siucv_name); |
493d3971 | 807 | low_nmcpy(user_data, iucv->src_name); |
eac3731b JH |
808 | ASCEBC(user_data, sizeof(user_data)); |
809 | ||
eac3731b | 810 | /* Create path. */ |
09488e2e | 811 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 812 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
813 | if (!iucv->path) { |
814 | err = -ENOMEM; | |
815 | goto done; | |
816 | } | |
6fcd61f7 FB |
817 | err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
818 | sa->siucv_user_id, NULL, user_data, | |
819 | sk); | |
eac3731b JH |
820 | if (err) { |
821 | iucv_path_free(iucv->path); | |
822 | iucv->path = NULL; | |
55cdea9e HB |
823 | switch (err) { |
824 | case 0x0b: /* Target communicator is not logged on */ | |
825 | err = -ENETUNREACH; | |
826 | break; | |
827 | case 0x0d: /* Max connections for this guest exceeded */ | |
828 | case 0x0e: /* Max connections for target guest exceeded */ | |
829 | err = -EAGAIN; | |
830 | break; | |
831 | case 0x0f: /* Missing IUCV authorization */ | |
832 | err = -EACCES; | |
833 | break; | |
834 | default: | |
835 | err = -ECONNREFUSED; | |
836 | break; | |
837 | } | |
eac3731b | 838 | } |
3881ac44 UB |
839 | done: |
840 | return err; | |
841 | } | |
eac3731b | 842 | |
3881ac44 UB |
843 | /* Connect an unconnected socket */ |
844 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
845 | int alen, int flags) | |
846 | { | |
847 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
848 | struct sock *sk = sock->sk; | |
849 | struct iucv_sock *iucv = iucv_sk(sk); | |
850 | int err; | |
851 | ||
852 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
853 | return -EINVAL; | |
854 | ||
855 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
856 | return -EBADFD; | |
857 | ||
858 | if (sk->sk_state == IUCV_OPEN && | |
859 | iucv->transport == AF_IUCV_TRANS_HIPER) | |
860 | return -EBADFD; /* explicit bind required */ | |
861 | ||
862 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) | |
863 | return -EINVAL; | |
864 | ||
865 | if (sk->sk_state == IUCV_OPEN) { | |
866 | err = iucv_sock_autobind(sk); | |
867 | if (unlikely(err)) | |
868 | return err; | |
869 | } | |
870 | ||
871 | lock_sock(sk); | |
872 | ||
873 | /* Set the destination information */ | |
874 | memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); | |
875 | memcpy(iucv->dst_name, sa->siucv_name, 8); | |
876 | ||
877 | if (iucv->transport == AF_IUCV_TRANS_HIPER) | |
9fbd87d4 | 878 | err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); |
3881ac44 UB |
879 | else |
880 | err = afiucv_path_connect(sock, addr); | |
881 | if (err) | |
882 | goto done; | |
883 | ||
884 | if (sk->sk_state != IUCV_CONNECTED) | |
0ea920d2 HB |
885 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
886 | IUCV_DISCONN), | |
887 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b | 888 | |
3881ac44 | 889 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
b8942e3b | 890 | err = -ECONNREFUSED; |
18becbc5 | 891 | |
7d316b94 UB |
892 | if (err && iucv->transport == AF_IUCV_TRANS_IUCV) |
893 | iucv_sever_path(sk, 0); | |
18becbc5 | 894 | |
eac3731b JH |
895 | done: |
896 | release_sock(sk); | |
897 | return err; | |
898 | } | |
899 | ||
900 | /* Move a socket into listening state. */ | |
901 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
902 | { | |
903 | struct sock *sk = sock->sk; | |
904 | int err; | |
905 | ||
906 | lock_sock(sk); | |
907 | ||
908 | err = -EINVAL; | |
aa8e71f5 HB |
909 | if (sk->sk_state != IUCV_BOUND) |
910 | goto done; | |
911 | ||
912 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
913 | goto done; |
914 | ||
915 | sk->sk_max_ack_backlog = backlog; | |
916 | sk->sk_ack_backlog = 0; | |
917 | sk->sk_state = IUCV_LISTEN; | |
918 | err = 0; | |
919 | ||
920 | done: | |
921 | release_sock(sk); | |
922 | return err; | |
923 | } | |
924 | ||
925 | /* Accept a pending connection */ | |
926 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
927 | int flags) | |
928 | { | |
929 | DECLARE_WAITQUEUE(wait, current); | |
930 | struct sock *sk = sock->sk, *nsk; | |
931 | long timeo; | |
932 | int err = 0; | |
933 | ||
561e0360 | 934 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
935 | |
936 | if (sk->sk_state != IUCV_LISTEN) { | |
937 | err = -EBADFD; | |
938 | goto done; | |
939 | } | |
940 | ||
941 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
942 | ||
943 | /* Wait for an incoming connection */ | |
aa395145 | 944 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 945 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
946 | set_current_state(TASK_INTERRUPTIBLE); |
947 | if (!timeo) { | |
948 | err = -EAGAIN; | |
949 | break; | |
950 | } | |
951 | ||
952 | release_sock(sk); | |
953 | timeo = schedule_timeout(timeo); | |
561e0360 | 954 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
955 | |
956 | if (sk->sk_state != IUCV_LISTEN) { | |
957 | err = -EBADFD; | |
958 | break; | |
959 | } | |
960 | ||
961 | if (signal_pending(current)) { | |
962 | err = sock_intr_errno(timeo); | |
963 | break; | |
964 | } | |
965 | } | |
966 | ||
967 | set_current_state(TASK_RUNNING); | |
aa395145 | 968 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
969 | |
970 | if (err) | |
971 | goto done; | |
972 | ||
973 | newsock->state = SS_CONNECTED; | |
974 | ||
975 | done: | |
976 | release_sock(sk); | |
977 | return err; | |
978 | } | |
979 | ||
980 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
981 | int *len, int peer) | |
982 | { | |
983 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
984 | struct sock *sk = sock->sk; | |
493d3971 | 985 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
986 | |
987 | addr->sa_family = AF_IUCV; | |
988 | *len = sizeof(struct sockaddr_iucv); | |
989 | ||
990 | if (peer) { | |
493d3971 UB |
991 | memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
992 | memcpy(siucv->siucv_name, iucv->dst_name, 8); | |
eac3731b | 993 | } else { |
493d3971 UB |
994 | memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
995 | memcpy(siucv->siucv_name, iucv->src_name, 8); | |
eac3731b JH |
996 | } |
997 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
998 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
493d3971 | 999 | memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
eac3731b JH |
1000 | |
1001 | return 0; | |
1002 | } | |
1003 | ||
b8942e3b HB |
1004 | /** |
1005 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
1006 | * @path: IUCV path | |
1007 | * @msg: Pointer to a struct iucv_message | |
1008 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
1009 | * | |
1010 | * Send the socket data in the parameter list in the iucv message | |
1011 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
1012 | * list and the socket data len at index 7 (last byte). | |
1013 | * See also iucv_msg_length(). | |
1014 | * | |
1015 | * Returns the error code from the iucv_message_send() call. | |
1016 | */ | |
1017 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
1018 | struct sk_buff *skb) | |
1019 | { | |
1020 | u8 prmdata[8]; | |
1021 | ||
1022 | memcpy(prmdata, (void *) skb->data, skb->len); | |
1023 | prmdata[7] = 0xff - (u8) skb->len; | |
6fcd61f7 | 1024 | return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
b8942e3b HB |
1025 | (void *) prmdata, 8); |
1026 | } | |
1027 | ||
1b784140 YX |
1028 | static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, |
1029 | size_t len) | |
eac3731b JH |
1030 | { |
1031 | struct sock *sk = sock->sk; | |
1032 | struct iucv_sock *iucv = iucv_sk(sk); | |
1033 | struct sk_buff *skb; | |
1034 | struct iucv_message txmsg; | |
44b1e6b5 HB |
1035 | struct cmsghdr *cmsg; |
1036 | int cmsg_done; | |
0ea920d2 | 1037 | long timeo; |
8f7c502c UB |
1038 | char user_id[9]; |
1039 | char appl_id[9]; | |
eac3731b | 1040 | int err; |
0ea920d2 | 1041 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
1042 | |
1043 | err = sock_error(sk); | |
1044 | if (err) | |
1045 | return err; | |
1046 | ||
1047 | if (msg->msg_flags & MSG_OOB) | |
1048 | return -EOPNOTSUPP; | |
1049 | ||
aa8e71f5 HB |
1050 | /* SOCK_SEQPACKET: we do not support segmented records */ |
1051 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
1052 | return -EOPNOTSUPP; | |
1053 | ||
eac3731b JH |
1054 | lock_sock(sk); |
1055 | ||
1056 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1057 | err = -EPIPE; | |
1058 | goto out; | |
1059 | } | |
1060 | ||
bb664f49 HB |
1061 | /* Return if the socket is not in connected state */ |
1062 | if (sk->sk_state != IUCV_CONNECTED) { | |
1063 | err = -ENOTCONN; | |
1064 | goto out; | |
1065 | } | |
44b1e6b5 | 1066 | |
bb664f49 HB |
1067 | /* initialize defaults */ |
1068 | cmsg_done = 0; /* check for duplicate headers */ | |
1069 | txmsg.class = 0; | |
44b1e6b5 | 1070 | |
bb664f49 | 1071 | /* iterate over control messages */ |
f95b414e | 1072 | for_each_cmsghdr(cmsg, msg) { |
bb664f49 HB |
1073 | if (!CMSG_OK(msg, cmsg)) { |
1074 | err = -EINVAL; | |
1075 | goto out; | |
1076 | } | |
44b1e6b5 | 1077 | |
bb664f49 HB |
1078 | if (cmsg->cmsg_level != SOL_IUCV) |
1079 | continue; | |
44b1e6b5 | 1080 | |
bb664f49 HB |
1081 | if (cmsg->cmsg_type & cmsg_done) { |
1082 | err = -EINVAL; | |
1083 | goto out; | |
1084 | } | |
1085 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 1086 | |
bb664f49 HB |
1087 | switch (cmsg->cmsg_type) { |
1088 | case SCM_IUCV_TRGCLS: | |
1089 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
1090 | err = -EINVAL; |
1091 | goto out; | |
1092 | } | |
44b1e6b5 | 1093 | |
bb664f49 HB |
1094 | /* set iucv message target class */ |
1095 | memcpy(&txmsg.class, | |
1096 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 1097 | |
bb664f49 | 1098 | break; |
44b1e6b5 | 1099 | |
bb664f49 HB |
1100 | default: |
1101 | err = -EINVAL; | |
1102 | goto out; | |
44b1e6b5 | 1103 | } |
bb664f49 | 1104 | } |
44b1e6b5 | 1105 | |
bb664f49 HB |
1106 | /* allocate one skb for each iucv message: |
1107 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
1108 | * segmented records using the MSG_EOR flag), but | |
1109 | * for SOCK_STREAM we might want to improve it in future */ | |
3881ac44 UB |
1110 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1111 | skb = sock_alloc_send_skb(sk, | |
1112 | len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, | |
1113 | noblock, &err); | |
1114 | else | |
1115 | skb = sock_alloc_send_skb(sk, len, noblock, &err); | |
ed4ac422 | 1116 | if (!skb) |
bb664f49 | 1117 | goto out; |
3881ac44 UB |
1118 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1119 | skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); | |
6ce8e9ce | 1120 | if (memcpy_from_msg(skb_put(skb, len), msg, len)) { |
bb664f49 HB |
1121 | err = -EFAULT; |
1122 | goto fail; | |
1123 | } | |
eac3731b | 1124 | |
0ea920d2 HB |
1125 | /* wait if outstanding messages for iucv path has reached */ |
1126 | timeo = sock_sndtimeo(sk, noblock); | |
1127 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
1128 | if (err) | |
1129 | goto fail; | |
eac3731b | 1130 | |
0ea920d2 HB |
1131 | /* return -ECONNRESET if the socket is no longer connected */ |
1132 | if (sk->sk_state != IUCV_CONNECTED) { | |
1133 | err = -ECONNRESET; | |
1134 | goto fail; | |
1135 | } | |
b8942e3b | 1136 | |
bb664f49 HB |
1137 | /* increment and save iucv message tag for msg_completion cbk */ |
1138 | txmsg.tag = iucv->send_tag++; | |
f9c41a62 | 1139 | IUCV_SKB_CB(skb)->tag = txmsg.tag; |
800c5eb7 | 1140 | |
3881ac44 UB |
1141 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1142 | atomic_inc(&iucv->msg_sent); | |
1143 | err = afiucv_hs_send(&txmsg, sk, skb, 0); | |
1144 | if (err) { | |
1145 | atomic_dec(&iucv->msg_sent); | |
1146 | goto fail; | |
1147 | } | |
1148 | goto release; | |
1149 | } | |
bb664f49 | 1150 | skb_queue_tail(&iucv->send_skb_q, skb); |
b8942e3b | 1151 | |
bb664f49 HB |
1152 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
1153 | && skb->len <= 7) { | |
1154 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 1155 | |
bb664f49 HB |
1156 | /* on success: there is no message_complete callback |
1157 | * for an IPRMDATA msg; remove skb from send queue */ | |
1158 | if (err == 0) { | |
1159 | skb_unlink(skb, &iucv->send_skb_q); | |
1160 | kfree_skb(skb); | |
1161 | } | |
1162 | ||
1163 | /* this error should never happen since the | |
1164 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1165 | if (err == 0x15) { | |
6fcd61f7 | 1166 | pr_iucv->path_sever(iucv->path, NULL); |
eac3731b JH |
1167 | skb_unlink(skb, &iucv->send_skb_q); |
1168 | err = -EPIPE; | |
1169 | goto fail; | |
1170 | } | |
bb664f49 | 1171 | } else |
6fcd61f7 | 1172 | err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, |
bb664f49 HB |
1173 | (void *) skb->data, skb->len); |
1174 | if (err) { | |
1175 | if (err == 3) { | |
1176 | user_id[8] = 0; | |
1177 | memcpy(user_id, iucv->dst_user_id, 8); | |
1178 | appl_id[8] = 0; | |
1179 | memcpy(appl_id, iucv->dst_name, 8); | |
1180 | pr_err("Application %s on z/VM guest %s" | |
1181 | " exceeds message limit\n", | |
1182 | appl_id, user_id); | |
0ea920d2 HB |
1183 | err = -EAGAIN; |
1184 | } else | |
1185 | err = -EPIPE; | |
bb664f49 | 1186 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1187 | goto fail; |
eac3731b JH |
1188 | } |
1189 | ||
3881ac44 | 1190 | release: |
eac3731b JH |
1191 | release_sock(sk); |
1192 | return len; | |
1193 | ||
1194 | fail: | |
1195 | kfree_skb(skb); | |
1196 | out: | |
1197 | release_sock(sk); | |
1198 | return err; | |
1199 | } | |
1200 | ||
bf95d20f HB |
1201 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1202 | * | |
1203 | * Locking: must be called with message_q.lock held | |
1204 | */ | |
f0703c80 UB |
1205 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1206 | { | |
1207 | int dataleft, size, copied = 0; | |
1208 | struct sk_buff *nskb; | |
1209 | ||
1210 | dataleft = len; | |
1211 | while (dataleft) { | |
1212 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1213 | size = sk->sk_rcvbuf / 4; | |
1214 | else | |
1215 | size = dataleft; | |
1216 | ||
1217 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1218 | if (!nskb) | |
1219 | return -ENOMEM; | |
1220 | ||
44b1e6b5 | 1221 | /* copy target class to control buffer of new skb */ |
f9c41a62 | 1222 | IUCV_SKB_CB(nskb)->class = IUCV_SKB_CB(skb)->class; |
44b1e6b5 HB |
1223 | |
1224 | /* copy data fragment */ | |
f0703c80 UB |
1225 | memcpy(nskb->data, skb->data + copied, size); |
1226 | copied += size; | |
1227 | dataleft -= size; | |
1228 | ||
1229 | skb_reset_transport_header(nskb); | |
1230 | skb_reset_network_header(nskb); | |
1231 | nskb->len = size; | |
1232 | ||
1233 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1234 | } | |
1235 | ||
1236 | return 0; | |
1237 | } | |
1238 | ||
bf95d20f HB |
1239 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1240 | * | |
1241 | * Locking: must be called with message_q.lock held | |
1242 | */ | |
f0703c80 UB |
1243 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1244 | struct iucv_path *path, | |
1245 | struct iucv_message *msg) | |
1246 | { | |
1247 | int rc; | |
b8942e3b HB |
1248 | unsigned int len; |
1249 | ||
1250 | len = iucv_msg_length(msg); | |
f0703c80 | 1251 | |
44b1e6b5 HB |
1252 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1253 | /* Note: the first 4 bytes are reserved for msg tag */ | |
f9c41a62 | 1254 | IUCV_SKB_CB(skb)->class = msg->class; |
44b1e6b5 | 1255 | |
b8942e3b HB |
1256 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1257 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1258 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1259 | skb->data = NULL; | |
1260 | skb->len = 0; | |
1261 | } | |
f0703c80 | 1262 | } else { |
6fcd61f7 FB |
1263 | rc = pr_iucv->message_receive(path, msg, |
1264 | msg->flags & IUCV_IPRMDATA, | |
1265 | skb->data, len, NULL); | |
f0703c80 UB |
1266 | if (rc) { |
1267 | kfree_skb(skb); | |
1268 | return; | |
1269 | } | |
aa8e71f5 HB |
1270 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1271 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1272 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1273 | if (sk->sk_type == SOCK_STREAM && | |
1274 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1275 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1276 | kfree_skb(skb); |
1277 | skb = NULL; | |
1278 | if (rc) { | |
6fcd61f7 | 1279 | pr_iucv->path_sever(path, NULL); |
f0703c80 UB |
1280 | return; |
1281 | } | |
1282 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1283 | } else { | |
1284 | skb_reset_transport_header(skb); | |
1285 | skb_reset_network_header(skb); | |
b8942e3b | 1286 | skb->len = len; |
f0703c80 UB |
1287 | } |
1288 | } | |
1289 | ||
f9c41a62 | 1290 | IUCV_SKB_CB(skb)->offset = 0; |
f0703c80 UB |
1291 | if (sock_queue_rcv_skb(sk, skb)) |
1292 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1293 | } | |
1294 | ||
bf95d20f HB |
1295 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1296 | * | |
1297 | * Locking: must be called with message_q.lock held | |
1298 | */ | |
f0703c80 UB |
1299 | static void iucv_process_message_q(struct sock *sk) |
1300 | { | |
1301 | struct iucv_sock *iucv = iucv_sk(sk); | |
1302 | struct sk_buff *skb; | |
1303 | struct sock_msg_q *p, *n; | |
1304 | ||
1305 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1306 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1307 | if (!skb) |
1308 | break; | |
1309 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1310 | list_del(&p->list); | |
1311 | kfree(p); | |
1312 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1313 | break; | |
1314 | } | |
1315 | } | |
1316 | ||
1b784140 YX |
1317 | static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1318 | size_t len, int flags) | |
eac3731b JH |
1319 | { |
1320 | int noblock = flags & MSG_DONTWAIT; | |
1321 | struct sock *sk = sock->sk; | |
561e0360 | 1322 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1323 | unsigned int copied, rlen; |
9fbd87d4 | 1324 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b | 1325 | int err = 0; |
f9c41a62 | 1326 | u32 offset; |
eac3731b | 1327 | |
aac6399c | 1328 | if ((sk->sk_state == IUCV_DISCONN) && |
f0703c80 UB |
1329 | skb_queue_empty(&iucv->backlog_skb_q) && |
1330 | skb_queue_empty(&sk->sk_receive_queue) && | |
1331 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1332 | return 0; |
1333 | ||
eac3731b JH |
1334 | if (flags & (MSG_OOB)) |
1335 | return -EOPNOTSUPP; | |
1336 | ||
60d3705f HB |
1337 | /* receive/dequeue next skb: |
1338 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1339 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1340 | if (!skb) { | |
1341 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1342 | return 0; | |
1343 | return err; | |
1344 | } | |
1345 | ||
f9c41a62 UB |
1346 | offset = IUCV_SKB_CB(skb)->offset; |
1347 | rlen = skb->len - offset; /* real length of skb */ | |
aa8e71f5 | 1348 | copied = min_t(unsigned int, rlen, len); |
82492a35 UB |
1349 | if (!rlen) |
1350 | sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; | |
eac3731b | 1351 | |
561e0360 | 1352 | cskb = skb; |
51f3d02b | 1353 | if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { |
802788bf HB |
1354 | if (!(flags & MSG_PEEK)) |
1355 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1356 | return -EFAULT; | |
eac3731b JH |
1357 | } |
1358 | ||
aa8e71f5 HB |
1359 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1360 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1361 | if (copied < rlen) | |
1362 | msg->msg_flags |= MSG_TRUNC; | |
1363 | /* each iucv message contains a complete record */ | |
1364 | msg->msg_flags |= MSG_EOR; | |
1365 | } | |
eac3731b | 1366 | |
44b1e6b5 HB |
1367 | /* create control message to store iucv msg target class: |
1368 | * get the trgcls from the control buffer of the skb due to | |
1369 | * fragmentation of original iucv message. */ | |
1370 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
f9c41a62 UB |
1371 | sizeof(IUCV_SKB_CB(skb)->class), |
1372 | (void *)&IUCV_SKB_CB(skb)->class); | |
44b1e6b5 HB |
1373 | if (err) { |
1374 | if (!(flags & MSG_PEEK)) | |
1375 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1376 | return err; | |
1377 | } | |
1378 | ||
eac3731b JH |
1379 | /* Mark read part of skb as used */ |
1380 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1381 | |
aa8e71f5 HB |
1382 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1383 | if (sk->sk_type == SOCK_STREAM) { | |
f9c41a62 UB |
1384 | if (copied < rlen) { |
1385 | IUCV_SKB_CB(skb)->offset = offset + copied; | |
2f139a5d | 1386 | skb_queue_head(&sk->sk_receive_queue, skb); |
aa8e71f5 HB |
1387 | goto done; |
1388 | } | |
eac3731b JH |
1389 | } |
1390 | ||
1391 | kfree_skb(skb); | |
800c5eb7 UB |
1392 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1393 | atomic_inc(&iucv->msg_recv); | |
1394 | if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { | |
1395 | WARN_ON(1); | |
1396 | iucv_sock_close(sk); | |
1397 | return -EFAULT; | |
1398 | } | |
1399 | } | |
561e0360 JH |
1400 | |
1401 | /* Queue backlog skbs */ | |
bf95d20f | 1402 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1403 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1404 | while (rskb) { |
f9c41a62 | 1405 | IUCV_SKB_CB(rskb)->offset = 0; |
561e0360 | 1406 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1407 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1408 | rskb); |
1409 | break; | |
1410 | } else { | |
f0703c80 | 1411 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1412 | } |
1413 | } | |
f0703c80 | 1414 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1415 | if (!list_empty(&iucv->message_q.list)) |
1416 | iucv_process_message_q(sk); | |
3881ac44 UB |
1417 | if (atomic_read(&iucv->msg_recv) >= |
1418 | iucv->msglimit / 2) { | |
9fbd87d4 | 1419 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); |
3881ac44 UB |
1420 | if (err) { |
1421 | sk->sk_state = IUCV_DISCONN; | |
1422 | sk->sk_state_change(sk); | |
1423 | } | |
1424 | } | |
f0703c80 | 1425 | } |
bf95d20f | 1426 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1427 | } |
eac3731b JH |
1428 | |
1429 | done: | |
aa8e71f5 HB |
1430 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1431 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1432 | copied = rlen; | |
1433 | ||
1434 | return copied; | |
eac3731b JH |
1435 | } |
1436 | ||
1437 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1438 | { | |
1439 | struct iucv_sock *isk, *n; | |
1440 | struct sock *sk; | |
1441 | ||
da99f056 | 1442 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1443 | sk = (struct sock *) isk; |
1444 | ||
1445 | if (sk->sk_state == IUCV_CONNECTED) | |
1446 | return POLLIN | POLLRDNORM; | |
1447 | } | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | ||
1452 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1453 | poll_table *wait) | |
1454 | { | |
1455 | struct sock *sk = sock->sk; | |
1456 | unsigned int mask = 0; | |
1457 | ||
aa395145 | 1458 | sock_poll_wait(file, sk_sleep(sk), wait); |
eac3731b JH |
1459 | |
1460 | if (sk->sk_state == IUCV_LISTEN) | |
1461 | return iucv_accept_poll(sk); | |
1462 | ||
1463 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
7d4c04fc | 1464 | mask |= POLLERR | |
8facd5fb | 1465 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); |
eac3731b JH |
1466 | |
1467 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1468 | mask |= POLLRDHUP; | |
1469 | ||
1470 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1471 | mask |= POLLHUP; | |
1472 | ||
1473 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1474 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1475 | mask |= POLLIN | POLLRDNORM; |
1476 | ||
1477 | if (sk->sk_state == IUCV_CLOSED) | |
1478 | mask |= POLLHUP; | |
1479 | ||
aac6399c | 1480 | if (sk->sk_state == IUCV_DISCONN) |
561e0360 JH |
1481 | mask |= POLLIN; |
1482 | ||
7f1b0ea4 | 1483 | if (sock_writeable(sk) && iucv_below_msglim(sk)) |
eac3731b JH |
1484 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
1485 | else | |
1486 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1487 | ||
1488 | return mask; | |
1489 | } | |
1490 | ||
1491 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1492 | { | |
1493 | struct sock *sk = sock->sk; | |
1494 | struct iucv_sock *iucv = iucv_sk(sk); | |
1495 | struct iucv_message txmsg; | |
1496 | int err = 0; | |
eac3731b JH |
1497 | |
1498 | how++; | |
1499 | ||
1500 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1501 | return -EINVAL; | |
1502 | ||
1503 | lock_sock(sk); | |
da99f056 | 1504 | switch (sk->sk_state) { |
82492a35 | 1505 | case IUCV_LISTEN: |
e14ad5fa HB |
1506 | case IUCV_DISCONN: |
1507 | case IUCV_CLOSING: | |
eac3731b JH |
1508 | case IUCV_CLOSED: |
1509 | err = -ENOTCONN; | |
1510 | goto fail; | |
eac3731b | 1511 | default: |
eac3731b JH |
1512 | break; |
1513 | } | |
1514 | ||
1515 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
82492a35 UB |
1516 | if (iucv->transport == AF_IUCV_TRANS_IUCV) { |
1517 | txmsg.class = 0; | |
1518 | txmsg.tag = 0; | |
1519 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1520 | IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); | |
1521 | if (err) { | |
1522 | switch (err) { | |
1523 | case 1: | |
1524 | err = -ENOTCONN; | |
1525 | break; | |
1526 | case 2: | |
1527 | err = -ECONNRESET; | |
1528 | break; | |
1529 | default: | |
1530 | err = -ENOTCONN; | |
1531 | break; | |
1532 | } | |
eac3731b | 1533 | } |
82492a35 UB |
1534 | } else |
1535 | iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); | |
eac3731b JH |
1536 | } |
1537 | ||
82492a35 | 1538 | sk->sk_shutdown |= how; |
eac3731b | 1539 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { |
1042cab8 UB |
1540 | if ((iucv->transport == AF_IUCV_TRANS_IUCV) && |
1541 | iucv->path) { | |
82492a35 UB |
1542 | err = pr_iucv->path_quiesce(iucv->path, NULL); |
1543 | if (err) | |
1544 | err = -ENOTCONN; | |
1545 | /* skb_queue_purge(&sk->sk_receive_queue); */ | |
1546 | } | |
eac3731b JH |
1547 | skb_queue_purge(&sk->sk_receive_queue); |
1548 | } | |
1549 | ||
1550 | /* Wake up anyone sleeping in poll */ | |
1551 | sk->sk_state_change(sk); | |
1552 | ||
1553 | fail: | |
1554 | release_sock(sk); | |
1555 | return err; | |
1556 | } | |
1557 | ||
1558 | static int iucv_sock_release(struct socket *sock) | |
1559 | { | |
1560 | struct sock *sk = sock->sk; | |
1561 | int err = 0; | |
1562 | ||
1563 | if (!sk) | |
1564 | return 0; | |
1565 | ||
1566 | iucv_sock_close(sk); | |
1567 | ||
eac3731b JH |
1568 | sock_orphan(sk); |
1569 | iucv_sock_kill(sk); | |
1570 | return err; | |
1571 | } | |
1572 | ||
9d5c5d8f HB |
1573 | /* getsockopt and setsockopt */ |
1574 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1575 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1576 | { |
1577 | struct sock *sk = sock->sk; | |
1578 | struct iucv_sock *iucv = iucv_sk(sk); | |
1579 | int val; | |
1580 | int rc; | |
1581 | ||
1582 | if (level != SOL_IUCV) | |
1583 | return -ENOPROTOOPT; | |
1584 | ||
1585 | if (optlen < sizeof(int)) | |
1586 | return -EINVAL; | |
1587 | ||
1588 | if (get_user(val, (int __user *) optval)) | |
1589 | return -EFAULT; | |
1590 | ||
1591 | rc = 0; | |
1592 | ||
1593 | lock_sock(sk); | |
1594 | switch (optname) { | |
1595 | case SO_IPRMDATA_MSG: | |
1596 | if (val) | |
1597 | iucv->flags |= IUCV_IPRMDATA; | |
1598 | else | |
1599 | iucv->flags &= ~IUCV_IPRMDATA; | |
1600 | break; | |
09488e2e HB |
1601 | case SO_MSGLIMIT: |
1602 | switch (sk->sk_state) { | |
1603 | case IUCV_OPEN: | |
1604 | case IUCV_BOUND: | |
1605 | if (val < 1 || val > (u16)(~0)) | |
1606 | rc = -EINVAL; | |
1607 | else | |
1608 | iucv->msglimit = val; | |
1609 | break; | |
1610 | default: | |
1611 | rc = -EINVAL; | |
1612 | break; | |
1613 | } | |
1614 | break; | |
9d5c5d8f HB |
1615 | default: |
1616 | rc = -ENOPROTOOPT; | |
1617 | break; | |
1618 | } | |
1619 | release_sock(sk); | |
1620 | ||
1621 | return rc; | |
1622 | } | |
1623 | ||
1624 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1625 | char __user *optval, int __user *optlen) | |
1626 | { | |
1627 | struct sock *sk = sock->sk; | |
1628 | struct iucv_sock *iucv = iucv_sk(sk); | |
51363b87 UB |
1629 | unsigned int val; |
1630 | int len; | |
9d5c5d8f HB |
1631 | |
1632 | if (level != SOL_IUCV) | |
1633 | return -ENOPROTOOPT; | |
1634 | ||
1635 | if (get_user(len, optlen)) | |
1636 | return -EFAULT; | |
1637 | ||
1638 | if (len < 0) | |
1639 | return -EINVAL; | |
1640 | ||
1641 | len = min_t(unsigned int, len, sizeof(int)); | |
1642 | ||
1643 | switch (optname) { | |
1644 | case SO_IPRMDATA_MSG: | |
1645 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1646 | break; | |
09488e2e HB |
1647 | case SO_MSGLIMIT: |
1648 | lock_sock(sk); | |
1649 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1650 | : iucv->msglimit; /* default */ | |
1651 | release_sock(sk); | |
1652 | break; | |
51363b87 UB |
1653 | case SO_MSGSIZE: |
1654 | if (sk->sk_state == IUCV_OPEN) | |
1655 | return -EBADFD; | |
1656 | val = (iucv->hs_dev) ? iucv->hs_dev->mtu - | |
1657 | sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : | |
1658 | 0x7fffffff; | |
1659 | break; | |
9d5c5d8f HB |
1660 | default: |
1661 | return -ENOPROTOOPT; | |
1662 | } | |
1663 | ||
1664 | if (put_user(len, optlen)) | |
1665 | return -EFAULT; | |
1666 | if (copy_to_user(optval, &val, len)) | |
1667 | return -EFAULT; | |
1668 | ||
1669 | return 0; | |
1670 | } | |
1671 | ||
1672 | ||
eac3731b JH |
1673 | /* Callback wrappers - called from iucv base support */ |
1674 | static int iucv_callback_connreq(struct iucv_path *path, | |
1675 | u8 ipvmid[8], u8 ipuser[16]) | |
1676 | { | |
1677 | unsigned char user_data[16]; | |
1678 | unsigned char nuser_data[16]; | |
1679 | unsigned char src_name[8]; | |
eac3731b JH |
1680 | struct sock *sk, *nsk; |
1681 | struct iucv_sock *iucv, *niucv; | |
1682 | int err; | |
1683 | ||
1684 | memcpy(src_name, ipuser, 8); | |
1685 | EBCASC(src_name, 8); | |
1686 | /* Find out if this path belongs to af_iucv. */ | |
1687 | read_lock(&iucv_sk_list.lock); | |
1688 | iucv = NULL; | |
febca281 | 1689 | sk = NULL; |
b67bfe0d | 1690 | sk_for_each(sk, &iucv_sk_list.head) |
eac3731b JH |
1691 | if (sk->sk_state == IUCV_LISTEN && |
1692 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1693 | /* | |
1694 | * Found a listening socket with | |
1695 | * src_name == ipuser[0-7]. | |
1696 | */ | |
1697 | iucv = iucv_sk(sk); | |
1698 | break; | |
1699 | } | |
1700 | read_unlock(&iucv_sk_list.lock); | |
1701 | if (!iucv) | |
1702 | /* No socket found, not one of our paths. */ | |
1703 | return -EINVAL; | |
1704 | ||
1705 | bh_lock_sock(sk); | |
1706 | ||
1707 | /* Check if parent socket is listening */ | |
1708 | low_nmcpy(user_data, iucv->src_name); | |
1709 | high_nmcpy(user_data, iucv->dst_name); | |
1710 | ASCEBC(user_data, sizeof(user_data)); | |
1711 | if (sk->sk_state != IUCV_LISTEN) { | |
6fcd61f7 | 1712 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1713 | iucv_path_free(path); |
eac3731b JH |
1714 | goto fail; |
1715 | } | |
1716 | ||
1717 | /* Check for backlog size */ | |
1718 | if (sk_acceptq_is_full(sk)) { | |
6fcd61f7 | 1719 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1720 | iucv_path_free(path); |
eac3731b JH |
1721 | goto fail; |
1722 | } | |
1723 | ||
1724 | /* Create the new socket */ | |
11aa9c28 | 1725 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); |
da99f056 | 1726 | if (!nsk) { |
6fcd61f7 | 1727 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1728 | iucv_path_free(path); |
eac3731b JH |
1729 | goto fail; |
1730 | } | |
1731 | ||
1732 | niucv = iucv_sk(nsk); | |
1733 | iucv_sock_init(nsk, sk); | |
1734 | ||
1735 | /* Set the new iucv_sock */ | |
1736 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1737 | EBCASC(niucv->dst_name, 8); | |
1738 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1739 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1740 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1741 | niucv->path = path; | |
1742 | ||
1743 | /* Call iucv_accept */ | |
1744 | high_nmcpy(nuser_data, ipuser + 8); | |
1745 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1746 | ASCEBC(nuser_data + 8, 8); | |
1747 | ||
09488e2e HB |
1748 | /* set message limit for path based on msglimit of accepting socket */ |
1749 | niucv->msglimit = iucv->msglimit; | |
1750 | path->msglim = iucv->msglimit; | |
6fcd61f7 | 1751 | err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1752 | if (err) { |
7d316b94 | 1753 | iucv_sever_path(nsk, 1); |
65dbd7c2 | 1754 | iucv_sock_kill(nsk); |
eac3731b JH |
1755 | goto fail; |
1756 | } | |
1757 | ||
1758 | iucv_accept_enqueue(sk, nsk); | |
1759 | ||
1760 | /* Wake up accept */ | |
1761 | nsk->sk_state = IUCV_CONNECTED; | |
676d2369 | 1762 | sk->sk_data_ready(sk); |
eac3731b JH |
1763 | err = 0; |
1764 | fail: | |
1765 | bh_unlock_sock(sk); | |
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1770 | { | |
1771 | struct sock *sk = path->private; | |
1772 | ||
1773 | sk->sk_state = IUCV_CONNECTED; | |
1774 | sk->sk_state_change(sk); | |
1775 | } | |
1776 | ||
1777 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1778 | { | |
1779 | struct sock *sk = path->private; | |
561e0360 | 1780 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1781 | struct sk_buff *skb; |
1782 | struct sock_msg_q *save_msg; | |
1783 | int len; | |
561e0360 | 1784 | |
fe86e54e | 1785 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
6fcd61f7 | 1786 | pr_iucv->message_reject(path, msg); |
eac3731b | 1787 | return; |
fe86e54e | 1788 | } |
eac3731b | 1789 | |
3fa6b5ad | 1790 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1791 | |
f0703c80 UB |
1792 | if (!list_empty(&iucv->message_q.list) || |
1793 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1794 | goto save_message; | |
1795 | ||
1796 | len = atomic_read(&sk->sk_rmem_alloc); | |
87fb4b7b | 1797 | len += SKB_TRUESIZE(iucv_msg_length(msg)); |
f0703c80 UB |
1798 | if (len > sk->sk_rcvbuf) |
1799 | goto save_message; | |
1800 | ||
b8942e3b | 1801 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1802 | if (!skb) |
1803 | goto save_message; | |
eac3731b | 1804 | |
f0703c80 | 1805 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1806 | goto out_unlock; |
eac3731b | 1807 | |
f0703c80 UB |
1808 | save_message: |
1809 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1810 | if (!save_msg) |
a56635a5 | 1811 | goto out_unlock; |
f0703c80 UB |
1812 | save_msg->path = path; |
1813 | save_msg->msg = *msg; | |
eac3731b | 1814 | |
f0703c80 | 1815 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1816 | |
1817 | out_unlock: | |
f0703c80 | 1818 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1819 | } |
1820 | ||
1821 | static void iucv_callback_txdone(struct iucv_path *path, | |
1822 | struct iucv_message *msg) | |
1823 | { | |
1824 | struct sock *sk = path->private; | |
f2a77991 | 1825 | struct sk_buff *this = NULL; |
eac3731b JH |
1826 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1827 | struct sk_buff *list_skb = list->next; | |
1828 | unsigned long flags; | |
1829 | ||
7d316b94 | 1830 | bh_lock_sock(sk); |
f2a77991 | 1831 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1832 | spin_lock_irqsave(&list->lock, flags); |
1833 | ||
f2a77991 | 1834 | while (list_skb != (struct sk_buff *)list) { |
f5738e2e | 1835 | if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { |
f2a77991 UB |
1836 | this = list_skb; |
1837 | break; | |
1838 | } | |
561e0360 | 1839 | list_skb = list_skb->next; |
f2a77991 UB |
1840 | } |
1841 | if (this) | |
1842 | __skb_unlink(this, list); | |
561e0360 JH |
1843 | |
1844 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1845 | |
0ea920d2 HB |
1846 | if (this) { |
1847 | kfree_skb(this); | |
1848 | /* wake up any process waiting for sending */ | |
1849 | iucv_sock_wake_msglim(sk); | |
1850 | } | |
561e0360 | 1851 | } |
eac3731b | 1852 | |
da99f056 | 1853 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1854 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1855 | sk->sk_state = IUCV_CLOSED; | |
1856 | sk->sk_state_change(sk); | |
1857 | } | |
1858 | } | |
7d316b94 | 1859 | bh_unlock_sock(sk); |
eac3731b | 1860 | |
eac3731b JH |
1861 | } |
1862 | ||
1863 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1864 | { | |
1865 | struct sock *sk = path->private; | |
1866 | ||
7d316b94 UB |
1867 | if (sk->sk_state == IUCV_CLOSED) |
1868 | return; | |
1869 | ||
1870 | bh_lock_sock(sk); | |
1871 | iucv_sever_path(sk, 1); | |
aac6399c | 1872 | sk->sk_state = IUCV_DISCONN; |
eac3731b JH |
1873 | |
1874 | sk->sk_state_change(sk); | |
7d316b94 | 1875 | bh_unlock_sock(sk); |
eac3731b JH |
1876 | } |
1877 | ||
af88b52d HB |
1878 | /* called if the other communication side shuts down its RECV direction; |
1879 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1880 | */ | |
1881 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1882 | { | |
1883 | struct sock *sk = path->private; | |
1884 | ||
1885 | bh_lock_sock(sk); | |
1886 | if (sk->sk_state != IUCV_CLOSED) { | |
1887 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1888 | sk->sk_state_change(sk); | |
1889 | } | |
1890 | bh_unlock_sock(sk); | |
1891 | } | |
1892 | ||
3881ac44 UB |
1893 | /***************** HiperSockets transport callbacks ********************/ |
1894 | static void afiucv_swap_src_dest(struct sk_buff *skb) | |
1895 | { | |
1896 | struct af_iucv_trans_hdr *trans_hdr = | |
1897 | (struct af_iucv_trans_hdr *)skb->data; | |
1898 | char tmpID[8]; | |
1899 | char tmpName[8]; | |
1900 | ||
1901 | ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
1902 | ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
1903 | ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
1904 | ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
1905 | memcpy(tmpID, trans_hdr->srcUserID, 8); | |
1906 | memcpy(tmpName, trans_hdr->srcAppName, 8); | |
1907 | memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); | |
1908 | memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); | |
1909 | memcpy(trans_hdr->destUserID, tmpID, 8); | |
1910 | memcpy(trans_hdr->destAppName, tmpName, 8); | |
1911 | skb_push(skb, ETH_HLEN); | |
1912 | memset(skb->data, 0, ETH_HLEN); | |
1913 | } | |
1914 | ||
1915 | /** | |
1916 | * afiucv_hs_callback_syn - react on received SYN | |
1917 | **/ | |
1918 | static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) | |
1919 | { | |
1920 | struct sock *nsk; | |
1921 | struct iucv_sock *iucv, *niucv; | |
1922 | struct af_iucv_trans_hdr *trans_hdr; | |
1923 | int err; | |
1924 | ||
1925 | iucv = iucv_sk(sk); | |
1926 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
1927 | if (!iucv) { | |
1928 | /* no sock - connection refused */ | |
1929 | afiucv_swap_src_dest(skb); | |
1930 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1931 | err = dev_queue_xmit(skb); | |
1932 | goto out; | |
1933 | } | |
1934 | ||
11aa9c28 | 1935 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); |
3881ac44 UB |
1936 | bh_lock_sock(sk); |
1937 | if ((sk->sk_state != IUCV_LISTEN) || | |
1938 | sk_acceptq_is_full(sk) || | |
1939 | !nsk) { | |
1940 | /* error on server socket - connection refused */ | |
3881ac44 UB |
1941 | afiucv_swap_src_dest(skb); |
1942 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1943 | err = dev_queue_xmit(skb); | |
4d520f62 | 1944 | iucv_sock_kill(nsk); |
3881ac44 UB |
1945 | bh_unlock_sock(sk); |
1946 | goto out; | |
1947 | } | |
1948 | ||
1949 | niucv = iucv_sk(nsk); | |
1950 | iucv_sock_init(nsk, sk); | |
1951 | niucv->transport = AF_IUCV_TRANS_HIPER; | |
1952 | niucv->msglimit = iucv->msglimit; | |
1953 | if (!trans_hdr->window) | |
1954 | niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; | |
1955 | else | |
1956 | niucv->msglimit_peer = trans_hdr->window; | |
1957 | memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); | |
1958 | memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); | |
1959 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1960 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1961 | nsk->sk_bound_dev_if = sk->sk_bound_dev_if; | |
800c5eb7 UB |
1962 | niucv->hs_dev = iucv->hs_dev; |
1963 | dev_hold(niucv->hs_dev); | |
3881ac44 UB |
1964 | afiucv_swap_src_dest(skb); |
1965 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; | |
1966 | trans_hdr->window = niucv->msglimit; | |
1967 | /* if receiver acks the xmit connection is established */ | |
1968 | err = dev_queue_xmit(skb); | |
1969 | if (!err) { | |
1970 | iucv_accept_enqueue(sk, nsk); | |
1971 | nsk->sk_state = IUCV_CONNECTED; | |
676d2369 | 1972 | sk->sk_data_ready(sk); |
3881ac44 UB |
1973 | } else |
1974 | iucv_sock_kill(nsk); | |
1975 | bh_unlock_sock(sk); | |
1976 | ||
1977 | out: | |
1978 | return NET_RX_SUCCESS; | |
1979 | } | |
1980 | ||
1981 | /** | |
1982 | * afiucv_hs_callback_synack() - react on received SYN-ACK | |
1983 | **/ | |
1984 | static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) | |
1985 | { | |
1986 | struct iucv_sock *iucv = iucv_sk(sk); | |
1987 | struct af_iucv_trans_hdr *trans_hdr = | |
1988 | (struct af_iucv_trans_hdr *)skb->data; | |
1989 | ||
1990 | if (!iucv) | |
1991 | goto out; | |
1992 | if (sk->sk_state != IUCV_BOUND) | |
1993 | goto out; | |
1994 | bh_lock_sock(sk); | |
1995 | iucv->msglimit_peer = trans_hdr->window; | |
1996 | sk->sk_state = IUCV_CONNECTED; | |
1997 | sk->sk_state_change(sk); | |
1998 | bh_unlock_sock(sk); | |
1999 | out: | |
2000 | kfree_skb(skb); | |
2001 | return NET_RX_SUCCESS; | |
2002 | } | |
2003 | ||
2004 | /** | |
2005 | * afiucv_hs_callback_synfin() - react on received SYN_FIN | |
2006 | **/ | |
2007 | static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) | |
2008 | { | |
2009 | struct iucv_sock *iucv = iucv_sk(sk); | |
2010 | ||
2011 | if (!iucv) | |
2012 | goto out; | |
2013 | if (sk->sk_state != IUCV_BOUND) | |
2014 | goto out; | |
2015 | bh_lock_sock(sk); | |
2016 | sk->sk_state = IUCV_DISCONN; | |
2017 | sk->sk_state_change(sk); | |
2018 | bh_unlock_sock(sk); | |
2019 | out: | |
2020 | kfree_skb(skb); | |
2021 | return NET_RX_SUCCESS; | |
2022 | } | |
2023 | ||
2024 | /** | |
2025 | * afiucv_hs_callback_fin() - react on received FIN | |
2026 | **/ | |
2027 | static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) | |
2028 | { | |
2029 | struct iucv_sock *iucv = iucv_sk(sk); | |
2030 | ||
2031 | /* other end of connection closed */ | |
800c5eb7 UB |
2032 | if (!iucv) |
2033 | goto out; | |
2034 | bh_lock_sock(sk); | |
2035 | if (sk->sk_state == IUCV_CONNECTED) { | |
aac6399c | 2036 | sk->sk_state = IUCV_DISCONN; |
3881ac44 | 2037 | sk->sk_state_change(sk); |
3881ac44 | 2038 | } |
800c5eb7 UB |
2039 | bh_unlock_sock(sk); |
2040 | out: | |
3881ac44 UB |
2041 | kfree_skb(skb); |
2042 | return NET_RX_SUCCESS; | |
2043 | } | |
2044 | ||
2045 | /** | |
2046 | * afiucv_hs_callback_win() - react on received WIN | |
2047 | **/ | |
2048 | static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) | |
2049 | { | |
2050 | struct iucv_sock *iucv = iucv_sk(sk); | |
2051 | struct af_iucv_trans_hdr *trans_hdr = | |
2052 | (struct af_iucv_trans_hdr *)skb->data; | |
2053 | ||
2054 | if (!iucv) | |
2055 | return NET_RX_SUCCESS; | |
2056 | ||
2057 | if (sk->sk_state != IUCV_CONNECTED) | |
2058 | return NET_RX_SUCCESS; | |
2059 | ||
2060 | atomic_sub(trans_hdr->window, &iucv->msg_sent); | |
2061 | iucv_sock_wake_msglim(sk); | |
2062 | return NET_RX_SUCCESS; | |
2063 | } | |
2064 | ||
2065 | /** | |
2066 | * afiucv_hs_callback_rx() - react on received data | |
2067 | **/ | |
2068 | static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) | |
2069 | { | |
2070 | struct iucv_sock *iucv = iucv_sk(sk); | |
2071 | ||
2072 | if (!iucv) { | |
2073 | kfree_skb(skb); | |
2074 | return NET_RX_SUCCESS; | |
2075 | } | |
2076 | ||
2077 | if (sk->sk_state != IUCV_CONNECTED) { | |
2078 | kfree_skb(skb); | |
2079 | return NET_RX_SUCCESS; | |
2080 | } | |
2081 | ||
82492a35 UB |
2082 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
2083 | kfree_skb(skb); | |
2084 | return NET_RX_SUCCESS; | |
2085 | } | |
2086 | ||
3881ac44 | 2087 | /* write stuff from iucv_msg to skb cb */ |
82492a35 | 2088 | if (skb->len < sizeof(struct af_iucv_trans_hdr)) { |
3881ac44 UB |
2089 | kfree_skb(skb); |
2090 | return NET_RX_SUCCESS; | |
2091 | } | |
2092 | skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); | |
2093 | skb_reset_transport_header(skb); | |
2094 | skb_reset_network_header(skb); | |
f9c41a62 | 2095 | IUCV_SKB_CB(skb)->offset = 0; |
3881ac44 UB |
2096 | spin_lock(&iucv->message_q.lock); |
2097 | if (skb_queue_empty(&iucv->backlog_skb_q)) { | |
2098 | if (sock_queue_rcv_skb(sk, skb)) { | |
2099 | /* handle rcv queue full */ | |
2100 | skb_queue_tail(&iucv->backlog_skb_q, skb); | |
2101 | } | |
2102 | } else | |
2103 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
2104 | spin_unlock(&iucv->message_q.lock); | |
2105 | return NET_RX_SUCCESS; | |
2106 | } | |
2107 | ||
2108 | /** | |
2109 | * afiucv_hs_rcv() - base function for arriving data through HiperSockets | |
2110 | * transport | |
2111 | * called from netif RX softirq | |
2112 | **/ | |
2113 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, | |
2114 | struct packet_type *pt, struct net_device *orig_dev) | |
2115 | { | |
3881ac44 UB |
2116 | struct sock *sk; |
2117 | struct iucv_sock *iucv; | |
2118 | struct af_iucv_trans_hdr *trans_hdr; | |
2119 | char nullstring[8]; | |
2120 | int err = 0; | |
2121 | ||
2122 | skb_pull(skb, ETH_HLEN); | |
2123 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
2124 | EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
2125 | EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
2126 | EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
2127 | EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
2128 | memset(nullstring, 0, sizeof(nullstring)); | |
2129 | iucv = NULL; | |
2130 | sk = NULL; | |
2131 | read_lock(&iucv_sk_list.lock); | |
b67bfe0d | 2132 | sk_for_each(sk, &iucv_sk_list.head) { |
3881ac44 UB |
2133 | if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { |
2134 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2135 | trans_hdr->destAppName, 8)) && | |
2136 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2137 | trans_hdr->destUserID, 8)) && | |
2138 | (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && | |
2139 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2140 | nullstring, 8))) { | |
2141 | iucv = iucv_sk(sk); | |
2142 | break; | |
2143 | } | |
2144 | } else { | |
2145 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2146 | trans_hdr->destAppName, 8)) && | |
2147 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2148 | trans_hdr->destUserID, 8)) && | |
2149 | (!memcmp(&iucv_sk(sk)->dst_name, | |
2150 | trans_hdr->srcAppName, 8)) && | |
2151 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2152 | trans_hdr->srcUserID, 8))) { | |
2153 | iucv = iucv_sk(sk); | |
2154 | break; | |
2155 | } | |
2156 | } | |
2157 | } | |
2158 | read_unlock(&iucv_sk_list.lock); | |
2159 | if (!iucv) | |
2160 | sk = NULL; | |
2161 | ||
2162 | /* no sock | |
2163 | how should we send with no sock | |
2164 | 1) send without sock no send rc checking? | |
2165 | 2) introduce default sock to handle this cases | |
2166 | ||
2167 | SYN -> send SYN|ACK in good case, send SYN|FIN in bad case | |
2168 | data -> send FIN | |
2169 | SYN|ACK, SYN|FIN, FIN -> no action? */ | |
2170 | ||
2171 | switch (trans_hdr->flags) { | |
2172 | case AF_IUCV_FLAG_SYN: | |
2173 | /* connect request */ | |
2174 | err = afiucv_hs_callback_syn(sk, skb); | |
2175 | break; | |
2176 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): | |
2177 | /* connect request confirmed */ | |
2178 | err = afiucv_hs_callback_synack(sk, skb); | |
2179 | break; | |
2180 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): | |
2181 | /* connect request refused */ | |
2182 | err = afiucv_hs_callback_synfin(sk, skb); | |
2183 | break; | |
2184 | case (AF_IUCV_FLAG_FIN): | |
2185 | /* close request */ | |
2186 | err = afiucv_hs_callback_fin(sk, skb); | |
2187 | break; | |
2188 | case (AF_IUCV_FLAG_WIN): | |
2189 | err = afiucv_hs_callback_win(sk, skb); | |
800c5eb7 UB |
2190 | if (skb->len == sizeof(struct af_iucv_trans_hdr)) { |
2191 | kfree_skb(skb); | |
2192 | break; | |
2193 | } | |
82492a35 UB |
2194 | /* fall through and receive non-zero length data */ |
2195 | case (AF_IUCV_FLAG_SHT): | |
2196 | /* shutdown request */ | |
2197 | /* fall through and receive zero length data */ | |
3881ac44 UB |
2198 | case 0: |
2199 | /* plain data frame */ | |
f9c41a62 | 2200 | IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; |
3881ac44 UB |
2201 | err = afiucv_hs_callback_rx(sk, skb); |
2202 | break; | |
2203 | default: | |
2204 | ; | |
2205 | } | |
2206 | ||
2207 | return err; | |
2208 | } | |
2209 | ||
2210 | /** | |
2211 | * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets | |
2212 | * transport | |
2213 | **/ | |
2214 | static void afiucv_hs_callback_txnotify(struct sk_buff *skb, | |
2215 | enum iucv_tx_notify n) | |
2216 | { | |
2217 | struct sock *isk = skb->sk; | |
2218 | struct sock *sk = NULL; | |
2219 | struct iucv_sock *iucv = NULL; | |
2220 | struct sk_buff_head *list; | |
2221 | struct sk_buff *list_skb; | |
800c5eb7 | 2222 | struct sk_buff *nskb; |
3881ac44 | 2223 | unsigned long flags; |
3881ac44 | 2224 | |
800c5eb7 | 2225 | read_lock_irqsave(&iucv_sk_list.lock, flags); |
b67bfe0d | 2226 | sk_for_each(sk, &iucv_sk_list.head) |
3881ac44 UB |
2227 | if (sk == isk) { |
2228 | iucv = iucv_sk(sk); | |
2229 | break; | |
2230 | } | |
800c5eb7 | 2231 | read_unlock_irqrestore(&iucv_sk_list.lock, flags); |
3881ac44 | 2232 | |
800c5eb7 | 2233 | if (!iucv || sock_flag(sk, SOCK_ZAPPED)) |
3881ac44 UB |
2234 | return; |
2235 | ||
3881ac44 | 2236 | list = &iucv->send_skb_q; |
800c5eb7 | 2237 | spin_lock_irqsave(&list->lock, flags); |
3881ac44 UB |
2238 | if (skb_queue_empty(list)) |
2239 | goto out_unlock; | |
800c5eb7 UB |
2240 | list_skb = list->next; |
2241 | nskb = list_skb->next; | |
3881ac44 UB |
2242 | while (list_skb != (struct sk_buff *)list) { |
2243 | if (skb_shinfo(list_skb) == skb_shinfo(skb)) { | |
3881ac44 UB |
2244 | switch (n) { |
2245 | case TX_NOTIFY_OK: | |
800c5eb7 UB |
2246 | __skb_unlink(list_skb, list); |
2247 | kfree_skb(list_skb); | |
3881ac44 | 2248 | iucv_sock_wake_msglim(sk); |
3881ac44 UB |
2249 | break; |
2250 | case TX_NOTIFY_PENDING: | |
2251 | atomic_inc(&iucv->pendings); | |
2252 | break; | |
2253 | case TX_NOTIFY_DELAYED_OK: | |
800c5eb7 | 2254 | __skb_unlink(list_skb, list); |
3881ac44 UB |
2255 | atomic_dec(&iucv->pendings); |
2256 | if (atomic_read(&iucv->pendings) <= 0) | |
2257 | iucv_sock_wake_msglim(sk); | |
800c5eb7 | 2258 | kfree_skb(list_skb); |
3881ac44 UB |
2259 | break; |
2260 | case TX_NOTIFY_UNREACHABLE: | |
2261 | case TX_NOTIFY_DELAYED_UNREACHABLE: | |
2262 | case TX_NOTIFY_TPQFULL: /* not yet used */ | |
2263 | case TX_NOTIFY_GENERALERROR: | |
2264 | case TX_NOTIFY_DELAYED_GENERALERROR: | |
800c5eb7 UB |
2265 | __skb_unlink(list_skb, list); |
2266 | kfree_skb(list_skb); | |
2267 | if (sk->sk_state == IUCV_CONNECTED) { | |
2268 | sk->sk_state = IUCV_DISCONN; | |
2269 | sk->sk_state_change(sk); | |
2270 | } | |
3881ac44 UB |
2271 | break; |
2272 | } | |
2273 | break; | |
2274 | } | |
800c5eb7 UB |
2275 | list_skb = nskb; |
2276 | nskb = nskb->next; | |
3881ac44 | 2277 | } |
800c5eb7 | 2278 | out_unlock: |
3881ac44 UB |
2279 | spin_unlock_irqrestore(&list->lock, flags); |
2280 | ||
42bd48e0 UB |
2281 | if (sk->sk_state == IUCV_CLOSING) { |
2282 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { | |
2283 | sk->sk_state = IUCV_CLOSED; | |
2284 | sk->sk_state_change(sk); | |
2285 | } | |
2286 | } | |
2287 | ||
3881ac44 | 2288 | } |
9fbd87d4 UB |
2289 | |
2290 | /* | |
2291 | * afiucv_netdev_event: handle netdev notifier chain events | |
2292 | */ | |
2293 | static int afiucv_netdev_event(struct notifier_block *this, | |
2294 | unsigned long event, void *ptr) | |
2295 | { | |
351638e7 | 2296 | struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); |
9fbd87d4 UB |
2297 | struct sock *sk; |
2298 | struct iucv_sock *iucv; | |
2299 | ||
2300 | switch (event) { | |
2301 | case NETDEV_REBOOT: | |
2302 | case NETDEV_GOING_DOWN: | |
b67bfe0d | 2303 | sk_for_each(sk, &iucv_sk_list.head) { |
9fbd87d4 UB |
2304 | iucv = iucv_sk(sk); |
2305 | if ((iucv->hs_dev == event_dev) && | |
2306 | (sk->sk_state == IUCV_CONNECTED)) { | |
2307 | if (event == NETDEV_GOING_DOWN) | |
2308 | iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); | |
2309 | sk->sk_state = IUCV_DISCONN; | |
2310 | sk->sk_state_change(sk); | |
2311 | } | |
2312 | } | |
2313 | break; | |
2314 | case NETDEV_DOWN: | |
2315 | case NETDEV_UNREGISTER: | |
2316 | default: | |
2317 | break; | |
2318 | } | |
2319 | return NOTIFY_DONE; | |
2320 | } | |
2321 | ||
2322 | static struct notifier_block afiucv_netdev_notifier = { | |
2323 | .notifier_call = afiucv_netdev_event, | |
2324 | }; | |
2325 | ||
5708e868 | 2326 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
2327 | .family = PF_IUCV, |
2328 | .owner = THIS_MODULE, | |
2329 | .release = iucv_sock_release, | |
2330 | .bind = iucv_sock_bind, | |
2331 | .connect = iucv_sock_connect, | |
2332 | .listen = iucv_sock_listen, | |
2333 | .accept = iucv_sock_accept, | |
2334 | .getname = iucv_sock_getname, | |
2335 | .sendmsg = iucv_sock_sendmsg, | |
2336 | .recvmsg = iucv_sock_recvmsg, | |
2337 | .poll = iucv_sock_poll, | |
2338 | .ioctl = sock_no_ioctl, | |
2339 | .mmap = sock_no_mmap, | |
2340 | .socketpair = sock_no_socketpair, | |
2341 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
2342 | .setsockopt = iucv_sock_setsockopt, |
2343 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
2344 | }; |
2345 | ||
ec1b4cf7 | 2346 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
2347 | .family = AF_IUCV, |
2348 | .owner = THIS_MODULE, | |
2349 | .create = iucv_sock_create, | |
2350 | }; | |
2351 | ||
3881ac44 UB |
2352 | static struct packet_type iucv_packet_type = { |
2353 | .type = cpu_to_be16(ETH_P_AF_IUCV), | |
2354 | .func = afiucv_hs_rcv, | |
2355 | }; | |
2356 | ||
2357 | static int afiucv_iucv_init(void) | |
6fcd61f7 FB |
2358 | { |
2359 | int err; | |
2360 | ||
2361 | err = pr_iucv->iucv_register(&af_iucv_handler, 0); | |
2362 | if (err) | |
2363 | goto out; | |
2364 | /* establish dummy device */ | |
2365 | af_iucv_driver.bus = pr_iucv->bus; | |
2366 | err = driver_register(&af_iucv_driver); | |
2367 | if (err) | |
2368 | goto out_iucv; | |
2369 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
2370 | if (!af_iucv_dev) { | |
2371 | err = -ENOMEM; | |
2372 | goto out_driver; | |
2373 | } | |
2374 | dev_set_name(af_iucv_dev, "af_iucv"); | |
2375 | af_iucv_dev->bus = pr_iucv->bus; | |
2376 | af_iucv_dev->parent = pr_iucv->root; | |
2377 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
2378 | af_iucv_dev->driver = &af_iucv_driver; | |
2379 | err = device_register(af_iucv_dev); | |
2380 | if (err) | |
2381 | goto out_driver; | |
2382 | return 0; | |
2383 | ||
2384 | out_driver: | |
2385 | driver_unregister(&af_iucv_driver); | |
2386 | out_iucv: | |
2387 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2388 | out: | |
2389 | return err; | |
2390 | } | |
2391 | ||
da99f056 | 2392 | static int __init afiucv_init(void) |
eac3731b JH |
2393 | { |
2394 | int err; | |
2395 | ||
3881ac44 UB |
2396 | if (MACHINE_IS_VM) { |
2397 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
2398 | if (unlikely(err)) { | |
2399 | WARN_ON(err); | |
2400 | err = -EPROTONOSUPPORT; | |
2401 | goto out; | |
2402 | } | |
eac3731b | 2403 | |
3881ac44 UB |
2404 | pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); |
2405 | if (!pr_iucv) { | |
2406 | printk(KERN_WARNING "iucv_if lookup failed\n"); | |
2407 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2408 | } | |
2409 | } else { | |
2410 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2411 | pr_iucv = NULL; | |
6fcd61f7 FB |
2412 | } |
2413 | ||
eac3731b JH |
2414 | err = proto_register(&iucv_proto, 0); |
2415 | if (err) | |
6fcd61f7 | 2416 | goto out; |
eac3731b JH |
2417 | err = sock_register(&iucv_sock_family_ops); |
2418 | if (err) | |
2419 | goto out_proto; | |
6fcd61f7 | 2420 | |
3881ac44 UB |
2421 | if (pr_iucv) { |
2422 | err = afiucv_iucv_init(); | |
2423 | if (err) | |
2424 | goto out_sock; | |
9fbd87d4 UB |
2425 | } else |
2426 | register_netdevice_notifier(&afiucv_netdev_notifier); | |
3881ac44 | 2427 | dev_add_pack(&iucv_packet_type); |
eac3731b JH |
2428 | return 0; |
2429 | ||
c23cad92 UB |
2430 | out_sock: |
2431 | sock_unregister(PF_IUCV); | |
eac3731b JH |
2432 | out_proto: |
2433 | proto_unregister(&iucv_proto); | |
eac3731b | 2434 | out: |
6fcd61f7 FB |
2435 | if (pr_iucv) |
2436 | symbol_put(iucv_if); | |
eac3731b JH |
2437 | return err; |
2438 | } | |
2439 | ||
2440 | static void __exit afiucv_exit(void) | |
2441 | { | |
3881ac44 UB |
2442 | if (pr_iucv) { |
2443 | device_unregister(af_iucv_dev); | |
2444 | driver_unregister(&af_iucv_driver); | |
2445 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2446 | symbol_put(iucv_if); | |
9fbd87d4 UB |
2447 | } else |
2448 | unregister_netdevice_notifier(&afiucv_netdev_notifier); | |
3881ac44 | 2449 | dev_remove_pack(&iucv_packet_type); |
eac3731b JH |
2450 | sock_unregister(PF_IUCV); |
2451 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2452 | } |
2453 | ||
2454 | module_init(afiucv_init); | |
2455 | module_exit(afiucv_exit); | |
2456 | ||
2457 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
2458 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
2459 | MODULE_VERSION(VERSION); | |
2460 | MODULE_LICENSE("GPL"); | |
2461 | MODULE_ALIAS_NETPROTO(PF_IUCV); | |
3881ac44 | 2462 |