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 | ||
52 | /* macros to set/get socket control buffer at correct offset */ | |
53 | #define CB_TAG(skb) ((skb)->cb) /* iucv message tag */ | |
54 | #define CB_TAG_LEN (sizeof(((struct iucv_message *) 0)->tag)) | |
55 | #define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ | |
56 | #define CB_TRGCLS_LEN (TRGCLS_SIZE) | |
57 | ||
0ea920d2 HB |
58 | #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
59 | do { \ | |
60 | DEFINE_WAIT(__wait); \ | |
61 | long __timeo = timeo; \ | |
62 | ret = 0; \ | |
aa395145 | 63 | prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
0ea920d2 | 64 | while (!(condition)) { \ |
0ea920d2 HB |
65 | if (!__timeo) { \ |
66 | ret = -EAGAIN; \ | |
67 | break; \ | |
68 | } \ | |
69 | if (signal_pending(current)) { \ | |
70 | ret = sock_intr_errno(__timeo); \ | |
71 | break; \ | |
72 | } \ | |
73 | release_sock(sk); \ | |
74 | __timeo = schedule_timeout(__timeo); \ | |
75 | lock_sock(sk); \ | |
76 | ret = sock_error(sk); \ | |
77 | if (ret) \ | |
78 | break; \ | |
79 | } \ | |
aa395145 | 80 | finish_wait(sk_sleep(sk), &__wait); \ |
0ea920d2 HB |
81 | } while (0) |
82 | ||
83 | #define iucv_sock_wait(sk, condition, timeo) \ | |
84 | ({ \ | |
85 | int __ret = 0; \ | |
86 | if (!(condition)) \ | |
87 | __iucv_sock_wait(sk, condition, timeo, __ret); \ | |
88 | __ret; \ | |
89 | }) | |
44b1e6b5 | 90 | |
57f20448 HC |
91 | static void iucv_sock_kill(struct sock *sk); |
92 | static void iucv_sock_close(struct sock *sk); | |
7d316b94 | 93 | static void iucv_sever_path(struct sock *, int); |
57f20448 | 94 | |
3881ac44 UB |
95 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, |
96 | struct packet_type *pt, struct net_device *orig_dev); | |
97 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
98 | struct sk_buff *skb, u8 flags); | |
99 | static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); | |
100 | ||
eac3731b JH |
101 | /* Call Back functions */ |
102 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
103 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
104 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
105 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
106 | u8 ipuser[16]); | |
eac3731b | 107 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 108 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
109 | |
110 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 111 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
112 | .autobind_name = ATOMIC_INIT(0) |
113 | }; | |
114 | ||
115 | static struct iucv_handler af_iucv_handler = { | |
116 | .path_pending = iucv_callback_connreq, | |
117 | .path_complete = iucv_callback_connack, | |
118 | .path_severed = iucv_callback_connrej, | |
119 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
120 | .message_complete = iucv_callback_txdone, |
121 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
122 | }; |
123 | ||
124 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
125 | { | |
126 | memcpy(dst, src, 8); | |
127 | } | |
128 | ||
129 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
130 | { | |
131 | memcpy(&dst[8], src, 8); | |
132 | } | |
133 | ||
816abbad UB |
134 | static void iucv_skb_queue_purge(struct sk_buff_head *list) |
135 | { | |
136 | struct sk_buff *skb; | |
137 | ||
138 | while ((skb = skb_dequeue(list)) != NULL) { | |
139 | if (skb->dev) | |
140 | dev_put(skb->dev); | |
141 | kfree_skb(skb); | |
142 | } | |
143 | } | |
144 | ||
c23cad92 UB |
145 | static int afiucv_pm_prepare(struct device *dev) |
146 | { | |
147 | #ifdef CONFIG_PM_DEBUG | |
148 | printk(KERN_WARNING "afiucv_pm_prepare\n"); | |
149 | #endif | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static void afiucv_pm_complete(struct device *dev) | |
154 | { | |
155 | #ifdef CONFIG_PM_DEBUG | |
156 | printk(KERN_WARNING "afiucv_pm_complete\n"); | |
157 | #endif | |
c23cad92 UB |
158 | } |
159 | ||
160 | /** | |
161 | * afiucv_pm_freeze() - Freeze PM callback | |
162 | * @dev: AFIUCV dummy device | |
163 | * | |
164 | * Sever all established IUCV communication pathes | |
165 | */ | |
166 | static int afiucv_pm_freeze(struct device *dev) | |
167 | { | |
168 | struct iucv_sock *iucv; | |
169 | struct sock *sk; | |
170 | struct hlist_node *node; | |
171 | int err = 0; | |
172 | ||
173 | #ifdef CONFIG_PM_DEBUG | |
174 | printk(KERN_WARNING "afiucv_pm_freeze\n"); | |
175 | #endif | |
176 | read_lock(&iucv_sk_list.lock); | |
177 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
178 | iucv = iucv_sk(sk); | |
816abbad | 179 | iucv_skb_queue_purge(&iucv->send_skb_q); |
c23cad92 UB |
180 | skb_queue_purge(&iucv->backlog_skb_q); |
181 | switch (sk->sk_state) { | |
c23cad92 UB |
182 | case IUCV_DISCONN: |
183 | case IUCV_CLOSING: | |
184 | case IUCV_CONNECTED: | |
7d316b94 | 185 | iucv_sever_path(sk, 0); |
c23cad92 UB |
186 | break; |
187 | case IUCV_OPEN: | |
188 | case IUCV_BOUND: | |
189 | case IUCV_LISTEN: | |
190 | case IUCV_CLOSED: | |
191 | default: | |
192 | break; | |
193 | } | |
7d316b94 UB |
194 | skb_queue_purge(&iucv->send_skb_q); |
195 | skb_queue_purge(&iucv->backlog_skb_q); | |
c23cad92 UB |
196 | } |
197 | read_unlock(&iucv_sk_list.lock); | |
198 | return err; | |
199 | } | |
200 | ||
201 | /** | |
202 | * afiucv_pm_restore_thaw() - Thaw and restore PM callback | |
203 | * @dev: AFIUCV dummy device | |
204 | * | |
205 | * socket clean up after freeze | |
206 | */ | |
207 | static int afiucv_pm_restore_thaw(struct device *dev) | |
208 | { | |
c23cad92 UB |
209 | struct sock *sk; |
210 | struct hlist_node *node; | |
211 | ||
212 | #ifdef CONFIG_PM_DEBUG | |
213 | printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); | |
214 | #endif | |
215 | read_lock(&iucv_sk_list.lock); | |
216 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
c23cad92 UB |
217 | switch (sk->sk_state) { |
218 | case IUCV_CONNECTED: | |
219 | sk->sk_err = EPIPE; | |
220 | sk->sk_state = IUCV_DISCONN; | |
221 | sk->sk_state_change(sk); | |
222 | break; | |
223 | case IUCV_DISCONN: | |
c23cad92 UB |
224 | case IUCV_CLOSING: |
225 | case IUCV_LISTEN: | |
226 | case IUCV_BOUND: | |
227 | case IUCV_OPEN: | |
228 | default: | |
229 | break; | |
230 | } | |
231 | } | |
232 | read_unlock(&iucv_sk_list.lock); | |
233 | return 0; | |
234 | } | |
235 | ||
47145210 | 236 | static const struct dev_pm_ops afiucv_pm_ops = { |
c23cad92 UB |
237 | .prepare = afiucv_pm_prepare, |
238 | .complete = afiucv_pm_complete, | |
239 | .freeze = afiucv_pm_freeze, | |
240 | .thaw = afiucv_pm_restore_thaw, | |
241 | .restore = afiucv_pm_restore_thaw, | |
242 | }; | |
243 | ||
244 | static struct device_driver af_iucv_driver = { | |
245 | .owner = THIS_MODULE, | |
246 | .name = "afiucv", | |
6fcd61f7 | 247 | .bus = NULL, |
c23cad92 UB |
248 | .pm = &afiucv_pm_ops, |
249 | }; | |
250 | ||
251 | /* dummy device used as trigger for PM functions */ | |
252 | static struct device *af_iucv_dev; | |
253 | ||
b8942e3b HB |
254 | /** |
255 | * iucv_msg_length() - Returns the length of an iucv message. | |
256 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
257 | * | |
258 | * The function returns the length of the specified iucv message @msg of data | |
259 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
260 | * | |
261 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
262 | * data: | |
263 | * PRMDATA[0..6] socket data (max 7 bytes); | |
264 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
265 | * | |
25985edc | 266 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
267 | * value from 0xFF. |
268 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
269 | * notifications (see iucv_sock_shutdown); and further, | |
270 | * if the socket data len is > 7, the function returns 8. | |
271 | * | |
272 | * Use this function to allocate socket buffers to store iucv message data. | |
273 | */ | |
274 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
275 | { | |
276 | size_t datalen; | |
277 | ||
278 | if (msg->flags & IUCV_IPRMDATA) { | |
279 | datalen = 0xff - msg->rmmsg[7]; | |
280 | return (datalen < 8) ? datalen : 8; | |
281 | } | |
282 | return msg->length; | |
283 | } | |
284 | ||
0ea920d2 HB |
285 | /** |
286 | * iucv_sock_in_state() - check for specific states | |
287 | * @sk: sock structure | |
288 | * @state: first iucv sk state | |
289 | * @state: second iucv sk state | |
290 | * | |
291 | * Returns true if the socket in either in the first or second state. | |
292 | */ | |
293 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
294 | { | |
295 | return (sk->sk_state == state || sk->sk_state == state2); | |
296 | } | |
297 | ||
298 | /** | |
299 | * iucv_below_msglim() - function to check if messages can be sent | |
300 | * @sk: sock structure | |
301 | * | |
302 | * Returns true if the send queue length is lower than the message limit. | |
303 | * Always returns true if the socket is not connected (no iucv path for | |
304 | * checking the message limit). | |
305 | */ | |
306 | static inline int iucv_below_msglim(struct sock *sk) | |
307 | { | |
308 | struct iucv_sock *iucv = iucv_sk(sk); | |
309 | ||
310 | if (sk->sk_state != IUCV_CONNECTED) | |
311 | return 1; | |
3881ac44 UB |
312 | if (iucv->transport == AF_IUCV_TRANS_IUCV) |
313 | return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); | |
314 | else | |
315 | return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && | |
316 | (atomic_read(&iucv->pendings) <= 0)); | |
0ea920d2 HB |
317 | } |
318 | ||
319 | /** | |
320 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
321 | */ | |
322 | static void iucv_sock_wake_msglim(struct sock *sk) | |
323 | { | |
43815482 ED |
324 | struct socket_wq *wq; |
325 | ||
326 | rcu_read_lock(); | |
327 | wq = rcu_dereference(sk->sk_wq); | |
328 | if (wq_has_sleeper(wq)) | |
329 | wake_up_interruptible_all(&wq->wait); | |
0ea920d2 | 330 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 331 | rcu_read_unlock(); |
0ea920d2 HB |
332 | } |
333 | ||
3881ac44 UB |
334 | /** |
335 | * afiucv_hs_send() - send a message through HiperSockets transport | |
336 | */ | |
337 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
338 | struct sk_buff *skb, u8 flags) | |
339 | { | |
340 | struct net *net = sock_net(sock); | |
341 | struct iucv_sock *iucv = iucv_sk(sock); | |
342 | struct af_iucv_trans_hdr *phs_hdr; | |
343 | struct sk_buff *nskb; | |
344 | int err, confirm_recv = 0; | |
345 | ||
346 | memset(skb->head, 0, ETH_HLEN); | |
347 | phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, | |
348 | sizeof(struct af_iucv_trans_hdr)); | |
349 | skb_reset_mac_header(skb); | |
350 | skb_reset_network_header(skb); | |
351 | skb_push(skb, ETH_HLEN); | |
352 | skb_reset_mac_header(skb); | |
353 | memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); | |
354 | ||
355 | phs_hdr->magic = ETH_P_AF_IUCV; | |
356 | phs_hdr->version = 1; | |
357 | phs_hdr->flags = flags; | |
358 | if (flags == AF_IUCV_FLAG_SYN) | |
359 | phs_hdr->window = iucv->msglimit; | |
360 | else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { | |
361 | confirm_recv = atomic_read(&iucv->msg_recv); | |
362 | phs_hdr->window = confirm_recv; | |
363 | if (confirm_recv) | |
364 | phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; | |
365 | } | |
366 | memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); | |
367 | memcpy(phs_hdr->destAppName, iucv->dst_name, 8); | |
368 | memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); | |
369 | memcpy(phs_hdr->srcAppName, iucv->src_name, 8); | |
370 | ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); | |
371 | ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); | |
372 | ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); | |
373 | ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); | |
374 | if (imsg) | |
375 | memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); | |
376 | ||
816abbad | 377 | skb->dev = dev_get_by_index(net, sock->sk_bound_dev_if); |
3881ac44 UB |
378 | if (!skb->dev) |
379 | return -ENODEV; | |
380 | if (!(skb->dev->flags & IFF_UP)) | |
381 | return -ENETDOWN; | |
382 | if (skb->len > skb->dev->mtu) { | |
383 | if (sock->sk_type == SOCK_SEQPACKET) | |
384 | return -EMSGSIZE; | |
385 | else | |
386 | skb_trim(skb, skb->dev->mtu); | |
387 | } | |
388 | skb->protocol = ETH_P_AF_IUCV; | |
389 | skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF; | |
390 | nskb = skb_clone(skb, GFP_ATOMIC); | |
391 | if (!nskb) | |
392 | return -ENOMEM; | |
393 | skb_queue_tail(&iucv->send_skb_q, nskb); | |
394 | err = dev_queue_xmit(skb); | |
395 | if (err) { | |
396 | skb_unlink(nskb, &iucv->send_skb_q); | |
816abbad | 397 | dev_put(nskb->dev); |
3881ac44 UB |
398 | kfree_skb(nskb); |
399 | } else { | |
400 | atomic_sub(confirm_recv, &iucv->msg_recv); | |
401 | WARN_ON(atomic_read(&iucv->msg_recv) < 0); | |
402 | } | |
403 | return err; | |
404 | } | |
405 | ||
eac3731b JH |
406 | static struct sock *__iucv_get_sock_by_name(char *nm) |
407 | { | |
408 | struct sock *sk; | |
409 | struct hlist_node *node; | |
410 | ||
411 | sk_for_each(sk, node, &iucv_sk_list.head) | |
412 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
413 | return sk; | |
414 | ||
415 | return NULL; | |
416 | } | |
417 | ||
418 | static void iucv_sock_destruct(struct sock *sk) | |
419 | { | |
420 | skb_queue_purge(&sk->sk_receive_queue); | |
421 | skb_queue_purge(&sk->sk_write_queue); | |
422 | } | |
423 | ||
424 | /* Cleanup Listen */ | |
425 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
426 | { | |
427 | struct sock *sk; | |
428 | ||
429 | /* Close non-accepted connections */ | |
430 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
431 | iucv_sock_close(sk); | |
432 | iucv_sock_kill(sk); | |
433 | } | |
434 | ||
435 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
436 | } |
437 | ||
7514bab0 | 438 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
439 | static void iucv_sock_kill(struct sock *sk) |
440 | { | |
441 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
442 | return; | |
443 | ||
444 | iucv_sock_unlink(&iucv_sk_list, sk); | |
445 | sock_set_flag(sk, SOCK_DEAD); | |
446 | sock_put(sk); | |
447 | } | |
448 | ||
7d316b94 UB |
449 | /* Terminate an IUCV path */ |
450 | static void iucv_sever_path(struct sock *sk, int with_user_data) | |
451 | { | |
452 | unsigned char user_data[16]; | |
453 | struct iucv_sock *iucv = iucv_sk(sk); | |
454 | struct iucv_path *path = iucv->path; | |
455 | ||
456 | if (iucv->path) { | |
457 | iucv->path = NULL; | |
458 | if (with_user_data) { | |
459 | low_nmcpy(user_data, iucv->src_name); | |
460 | high_nmcpy(user_data, iucv->dst_name); | |
461 | ASCEBC(user_data, sizeof(user_data)); | |
462 | pr_iucv->path_sever(path, user_data); | |
463 | } else | |
464 | pr_iucv->path_sever(path, NULL); | |
465 | iucv_path_free(path); | |
466 | } | |
467 | } | |
468 | ||
eac3731b JH |
469 | /* Close an IUCV socket */ |
470 | static void iucv_sock_close(struct sock *sk) | |
471 | { | |
eac3731b | 472 | struct iucv_sock *iucv = iucv_sk(sk); |
561e0360 | 473 | unsigned long timeo; |
3881ac44 UB |
474 | int err, blen; |
475 | struct sk_buff *skb; | |
eac3731b | 476 | |
eac3731b JH |
477 | lock_sock(sk); |
478 | ||
da99f056 | 479 | switch (sk->sk_state) { |
eac3731b JH |
480 | case IUCV_LISTEN: |
481 | iucv_sock_cleanup_listen(sk); | |
482 | break; | |
483 | ||
484 | case IUCV_CONNECTED: | |
3881ac44 UB |
485 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
486 | /* send fin */ | |
487 | blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
488 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
489 | if (skb) { | |
816abbad | 490 | skb_reserve(skb, blen); |
3881ac44 UB |
491 | err = afiucv_hs_send(NULL, sk, skb, |
492 | AF_IUCV_FLAG_FIN); | |
493 | } | |
494 | sk->sk_state = IUCV_DISCONN; | |
495 | sk->sk_state_change(sk); | |
496 | } | |
816abbad | 497 | case IUCV_DISCONN: /* fall through */ |
561e0360 JH |
498 | sk->sk_state = IUCV_CLOSING; |
499 | sk->sk_state_change(sk); | |
500 | ||
da99f056 | 501 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
502 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
503 | timeo = sk->sk_lingertime; | |
504 | else | |
505 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 506 | iucv_sock_wait(sk, |
0ea920d2 HB |
507 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
508 | timeo); | |
561e0360 JH |
509 | } |
510 | ||
bbe188c8 | 511 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
512 | sk->sk_state = IUCV_CLOSED; |
513 | sk->sk_state_change(sk); | |
514 | ||
eac3731b JH |
515 | sk->sk_err = ECONNRESET; |
516 | sk->sk_state_change(sk); | |
517 | ||
816abbad | 518 | iucv_skb_queue_purge(&iucv->send_skb_q); |
561e0360 | 519 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b | 520 | |
7d316b94 UB |
521 | default: /* fall through */ |
522 | iucv_sever_path(sk, 1); | |
3ff50b79 | 523 | } |
eac3731b | 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 | ||
537 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
538 | { | |
539 | struct sock *sk; | |
493d3971 | 540 | struct iucv_sock *iucv; |
eac3731b | 541 | |
6257ff21 | 542 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
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 JH |
603 | |
604 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
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 | ||
eac3731b JH |
684 | /* Bind an unbound socket */ |
685 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
686 | int addr_len) | |
687 | { | |
688 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
689 | struct sock *sk = sock->sk; | |
690 | struct iucv_sock *iucv; | |
3881ac44 UB |
691 | int err = 0; |
692 | struct net_device *dev; | |
693 | char uid[9]; | |
eac3731b JH |
694 | |
695 | /* Verify the input sockaddr */ | |
696 | if (!addr || addr->sa_family != AF_IUCV) | |
697 | return -EINVAL; | |
698 | ||
699 | lock_sock(sk); | |
700 | if (sk->sk_state != IUCV_OPEN) { | |
701 | err = -EBADFD; | |
702 | goto done; | |
703 | } | |
704 | ||
705 | write_lock_bh(&iucv_sk_list.lock); | |
706 | ||
707 | iucv = iucv_sk(sk); | |
708 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
709 | err = -EADDRINUSE; | |
710 | goto done_unlock; | |
711 | } | |
3881ac44 | 712 | if (iucv->path) |
eac3731b | 713 | goto done_unlock; |
eac3731b JH |
714 | |
715 | /* Bind the socket */ | |
eac3731b | 716 | |
3881ac44 UB |
717 | if (pr_iucv) |
718 | if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) | |
719 | goto vm_bind; /* VM IUCV transport */ | |
eac3731b | 720 | |
3881ac44 UB |
721 | /* try hiper transport */ |
722 | memcpy(uid, sa->siucv_user_id, sizeof(uid)); | |
723 | ASCEBC(uid, 8); | |
724 | rcu_read_lock(); | |
725 | for_each_netdev_rcu(&init_net, dev) { | |
726 | if (!memcmp(dev->perm_addr, uid, 8)) { | |
727 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
728 | memcpy(iucv->src_user_id, sa->siucv_user_id, 8); | |
816abbad | 729 | sk->sk_bound_dev_if = dev->ifindex; |
3881ac44 UB |
730 | sk->sk_state = IUCV_BOUND; |
731 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
732 | if (!iucv->msglimit) | |
733 | iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; | |
734 | rcu_read_unlock(); | |
735 | goto done_unlock; | |
736 | } | |
737 | } | |
738 | rcu_read_unlock(); | |
739 | vm_bind: | |
740 | if (pr_iucv) { | |
741 | /* use local userid for backward compat */ | |
742 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
743 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
744 | sk->sk_state = IUCV_BOUND; | |
745 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
746 | if (!iucv->msglimit) | |
747 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
748 | goto done_unlock; | |
749 | } | |
750 | /* found no dev to bind */ | |
751 | err = -ENODEV; | |
eac3731b JH |
752 | done_unlock: |
753 | /* Release the socket list lock */ | |
754 | write_unlock_bh(&iucv_sk_list.lock); | |
755 | done: | |
756 | release_sock(sk); | |
757 | return err; | |
758 | } | |
759 | ||
760 | /* Automatically bind an unbound socket */ | |
761 | static int iucv_sock_autobind(struct sock *sk) | |
762 | { | |
763 | struct iucv_sock *iucv = iucv_sk(sk); | |
eac3731b JH |
764 | char name[12]; |
765 | int err = 0; | |
766 | ||
aac6399c | 767 | if (unlikely(!pr_iucv)) |
eac3731b JH |
768 | return -EPROTO; |
769 | ||
aac6399c | 770 | memcpy(iucv->src_user_id, iucv_userid, 8); |
eac3731b JH |
771 | |
772 | write_lock_bh(&iucv_sk_list.lock); | |
773 | ||
774 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
775 | while (__iucv_get_sock_by_name(name)) { | |
776 | sprintf(name, "%08x", | |
777 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
778 | } | |
779 | ||
780 | write_unlock_bh(&iucv_sk_list.lock); | |
781 | ||
782 | memcpy(&iucv->src_name, name, 8); | |
783 | ||
3881ac44 UB |
784 | if (!iucv->msglimit) |
785 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
786 | ||
eac3731b JH |
787 | return err; |
788 | } | |
789 | ||
3881ac44 UB |
790 | static int afiucv_hs_connect(struct socket *sock) |
791 | { | |
792 | struct sock *sk = sock->sk; | |
793 | struct sk_buff *skb; | |
794 | int blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
795 | int err = 0; | |
796 | ||
797 | /* send syn */ | |
798 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
799 | if (!skb) { | |
800 | err = -ENOMEM; | |
801 | goto done; | |
802 | } | |
803 | skb->dev = NULL; | |
804 | skb_reserve(skb, blen); | |
805 | err = afiucv_hs_send(NULL, sk, skb, AF_IUCV_FLAG_SYN); | |
806 | done: | |
807 | return err; | |
808 | } | |
809 | ||
810 | static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) | |
eac3731b JH |
811 | { |
812 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
813 | struct sock *sk = sock->sk; | |
493d3971 | 814 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
815 | unsigned char user_data[16]; |
816 | int err; | |
817 | ||
eac3731b | 818 | high_nmcpy(user_data, sa->siucv_name); |
493d3971 | 819 | low_nmcpy(user_data, iucv->src_name); |
eac3731b JH |
820 | ASCEBC(user_data, sizeof(user_data)); |
821 | ||
eac3731b | 822 | /* Create path. */ |
09488e2e | 823 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 824 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
825 | if (!iucv->path) { |
826 | err = -ENOMEM; | |
827 | goto done; | |
828 | } | |
6fcd61f7 FB |
829 | err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
830 | sa->siucv_user_id, NULL, user_data, | |
831 | sk); | |
eac3731b JH |
832 | if (err) { |
833 | iucv_path_free(iucv->path); | |
834 | iucv->path = NULL; | |
55cdea9e HB |
835 | switch (err) { |
836 | case 0x0b: /* Target communicator is not logged on */ | |
837 | err = -ENETUNREACH; | |
838 | break; | |
839 | case 0x0d: /* Max connections for this guest exceeded */ | |
840 | case 0x0e: /* Max connections for target guest exceeded */ | |
841 | err = -EAGAIN; | |
842 | break; | |
843 | case 0x0f: /* Missing IUCV authorization */ | |
844 | err = -EACCES; | |
845 | break; | |
846 | default: | |
847 | err = -ECONNREFUSED; | |
848 | break; | |
849 | } | |
eac3731b | 850 | } |
3881ac44 UB |
851 | done: |
852 | return err; | |
853 | } | |
eac3731b | 854 | |
3881ac44 UB |
855 | /* Connect an unconnected socket */ |
856 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
857 | int alen, int flags) | |
858 | { | |
859 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
860 | struct sock *sk = sock->sk; | |
861 | struct iucv_sock *iucv = iucv_sk(sk); | |
862 | int err; | |
863 | ||
864 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
865 | return -EINVAL; | |
866 | ||
867 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
868 | return -EBADFD; | |
869 | ||
870 | if (sk->sk_state == IUCV_OPEN && | |
871 | iucv->transport == AF_IUCV_TRANS_HIPER) | |
872 | return -EBADFD; /* explicit bind required */ | |
873 | ||
874 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) | |
875 | return -EINVAL; | |
876 | ||
877 | if (sk->sk_state == IUCV_OPEN) { | |
878 | err = iucv_sock_autobind(sk); | |
879 | if (unlikely(err)) | |
880 | return err; | |
881 | } | |
882 | ||
883 | lock_sock(sk); | |
884 | ||
885 | /* Set the destination information */ | |
886 | memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); | |
887 | memcpy(iucv->dst_name, sa->siucv_name, 8); | |
888 | ||
889 | if (iucv->transport == AF_IUCV_TRANS_HIPER) | |
890 | err = afiucv_hs_connect(sock); | |
891 | else | |
892 | err = afiucv_path_connect(sock, addr); | |
893 | if (err) | |
894 | goto done; | |
895 | ||
896 | if (sk->sk_state != IUCV_CONNECTED) | |
0ea920d2 HB |
897 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
898 | IUCV_DISCONN), | |
899 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b | 900 | |
3881ac44 | 901 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
b8942e3b | 902 | err = -ECONNREFUSED; |
18becbc5 | 903 | |
7d316b94 UB |
904 | if (err && iucv->transport == AF_IUCV_TRANS_IUCV) |
905 | iucv_sever_path(sk, 0); | |
18becbc5 | 906 | |
eac3731b JH |
907 | done: |
908 | release_sock(sk); | |
909 | return err; | |
910 | } | |
911 | ||
912 | /* Move a socket into listening state. */ | |
913 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
914 | { | |
915 | struct sock *sk = sock->sk; | |
916 | int err; | |
917 | ||
918 | lock_sock(sk); | |
919 | ||
920 | err = -EINVAL; | |
aa8e71f5 HB |
921 | if (sk->sk_state != IUCV_BOUND) |
922 | goto done; | |
923 | ||
924 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
925 | goto done; |
926 | ||
927 | sk->sk_max_ack_backlog = backlog; | |
928 | sk->sk_ack_backlog = 0; | |
929 | sk->sk_state = IUCV_LISTEN; | |
930 | err = 0; | |
931 | ||
932 | done: | |
933 | release_sock(sk); | |
934 | return err; | |
935 | } | |
936 | ||
937 | /* Accept a pending connection */ | |
938 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
939 | int flags) | |
940 | { | |
941 | DECLARE_WAITQUEUE(wait, current); | |
942 | struct sock *sk = sock->sk, *nsk; | |
943 | long timeo; | |
944 | int err = 0; | |
945 | ||
561e0360 | 946 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
947 | |
948 | if (sk->sk_state != IUCV_LISTEN) { | |
949 | err = -EBADFD; | |
950 | goto done; | |
951 | } | |
952 | ||
953 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
954 | ||
955 | /* Wait for an incoming connection */ | |
aa395145 | 956 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 957 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
958 | set_current_state(TASK_INTERRUPTIBLE); |
959 | if (!timeo) { | |
960 | err = -EAGAIN; | |
961 | break; | |
962 | } | |
963 | ||
964 | release_sock(sk); | |
965 | timeo = schedule_timeout(timeo); | |
561e0360 | 966 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
967 | |
968 | if (sk->sk_state != IUCV_LISTEN) { | |
969 | err = -EBADFD; | |
970 | break; | |
971 | } | |
972 | ||
973 | if (signal_pending(current)) { | |
974 | err = sock_intr_errno(timeo); | |
975 | break; | |
976 | } | |
977 | } | |
978 | ||
979 | set_current_state(TASK_RUNNING); | |
aa395145 | 980 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
981 | |
982 | if (err) | |
983 | goto done; | |
984 | ||
985 | newsock->state = SS_CONNECTED; | |
986 | ||
987 | done: | |
988 | release_sock(sk); | |
989 | return err; | |
990 | } | |
991 | ||
992 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
993 | int *len, int peer) | |
994 | { | |
995 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
996 | struct sock *sk = sock->sk; | |
493d3971 | 997 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
998 | |
999 | addr->sa_family = AF_IUCV; | |
1000 | *len = sizeof(struct sockaddr_iucv); | |
1001 | ||
1002 | if (peer) { | |
493d3971 UB |
1003 | memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
1004 | memcpy(siucv->siucv_name, iucv->dst_name, 8); | |
eac3731b | 1005 | } else { |
493d3971 UB |
1006 | memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
1007 | memcpy(siucv->siucv_name, iucv->src_name, 8); | |
eac3731b JH |
1008 | } |
1009 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
1010 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
493d3971 | 1011 | memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
eac3731b JH |
1012 | |
1013 | return 0; | |
1014 | } | |
1015 | ||
b8942e3b HB |
1016 | /** |
1017 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
1018 | * @path: IUCV path | |
1019 | * @msg: Pointer to a struct iucv_message | |
1020 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
1021 | * | |
1022 | * Send the socket data in the parameter list in the iucv message | |
1023 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
1024 | * list and the socket data len at index 7 (last byte). | |
1025 | * See also iucv_msg_length(). | |
1026 | * | |
1027 | * Returns the error code from the iucv_message_send() call. | |
1028 | */ | |
1029 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
1030 | struct sk_buff *skb) | |
1031 | { | |
1032 | u8 prmdata[8]; | |
1033 | ||
1034 | memcpy(prmdata, (void *) skb->data, skb->len); | |
1035 | prmdata[7] = 0xff - (u8) skb->len; | |
6fcd61f7 | 1036 | return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
b8942e3b HB |
1037 | (void *) prmdata, 8); |
1038 | } | |
1039 | ||
eac3731b JH |
1040 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1041 | struct msghdr *msg, size_t len) | |
1042 | { | |
1043 | struct sock *sk = sock->sk; | |
1044 | struct iucv_sock *iucv = iucv_sk(sk); | |
1045 | struct sk_buff *skb; | |
1046 | struct iucv_message txmsg; | |
44b1e6b5 HB |
1047 | struct cmsghdr *cmsg; |
1048 | int cmsg_done; | |
0ea920d2 | 1049 | long timeo; |
8f7c502c UB |
1050 | char user_id[9]; |
1051 | char appl_id[9]; | |
eac3731b | 1052 | int err; |
0ea920d2 | 1053 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
1054 | |
1055 | err = sock_error(sk); | |
1056 | if (err) | |
1057 | return err; | |
1058 | ||
1059 | if (msg->msg_flags & MSG_OOB) | |
1060 | return -EOPNOTSUPP; | |
1061 | ||
aa8e71f5 HB |
1062 | /* SOCK_SEQPACKET: we do not support segmented records */ |
1063 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
1064 | return -EOPNOTSUPP; | |
1065 | ||
eac3731b JH |
1066 | lock_sock(sk); |
1067 | ||
1068 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1069 | err = -EPIPE; | |
1070 | goto out; | |
1071 | } | |
1072 | ||
bb664f49 HB |
1073 | /* Return if the socket is not in connected state */ |
1074 | if (sk->sk_state != IUCV_CONNECTED) { | |
1075 | err = -ENOTCONN; | |
1076 | goto out; | |
1077 | } | |
44b1e6b5 | 1078 | |
bb664f49 HB |
1079 | /* initialize defaults */ |
1080 | cmsg_done = 0; /* check for duplicate headers */ | |
1081 | txmsg.class = 0; | |
44b1e6b5 | 1082 | |
bb664f49 HB |
1083 | /* iterate over control messages */ |
1084 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; | |
1085 | cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
44b1e6b5 | 1086 | |
bb664f49 HB |
1087 | if (!CMSG_OK(msg, cmsg)) { |
1088 | err = -EINVAL; | |
1089 | goto out; | |
1090 | } | |
44b1e6b5 | 1091 | |
bb664f49 HB |
1092 | if (cmsg->cmsg_level != SOL_IUCV) |
1093 | continue; | |
44b1e6b5 | 1094 | |
bb664f49 HB |
1095 | if (cmsg->cmsg_type & cmsg_done) { |
1096 | err = -EINVAL; | |
1097 | goto out; | |
1098 | } | |
1099 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 1100 | |
bb664f49 HB |
1101 | switch (cmsg->cmsg_type) { |
1102 | case SCM_IUCV_TRGCLS: | |
1103 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
1104 | err = -EINVAL; |
1105 | goto out; | |
1106 | } | |
44b1e6b5 | 1107 | |
bb664f49 HB |
1108 | /* set iucv message target class */ |
1109 | memcpy(&txmsg.class, | |
1110 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 1111 | |
bb664f49 | 1112 | break; |
44b1e6b5 | 1113 | |
bb664f49 HB |
1114 | default: |
1115 | err = -EINVAL; | |
1116 | goto out; | |
1117 | break; | |
44b1e6b5 | 1118 | } |
bb664f49 | 1119 | } |
44b1e6b5 | 1120 | |
bb664f49 HB |
1121 | /* allocate one skb for each iucv message: |
1122 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
1123 | * segmented records using the MSG_EOR flag), but | |
1124 | * for SOCK_STREAM we might want to improve it in future */ | |
3881ac44 UB |
1125 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1126 | skb = sock_alloc_send_skb(sk, | |
1127 | len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, | |
1128 | noblock, &err); | |
1129 | else | |
1130 | skb = sock_alloc_send_skb(sk, len, noblock, &err); | |
bb664f49 HB |
1131 | if (!skb) |
1132 | goto out; | |
3881ac44 UB |
1133 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1134 | skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); | |
bb664f49 HB |
1135 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
1136 | err = -EFAULT; | |
1137 | goto fail; | |
1138 | } | |
eac3731b | 1139 | |
0ea920d2 HB |
1140 | /* wait if outstanding messages for iucv path has reached */ |
1141 | timeo = sock_sndtimeo(sk, noblock); | |
1142 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
1143 | if (err) | |
1144 | goto fail; | |
eac3731b | 1145 | |
0ea920d2 HB |
1146 | /* return -ECONNRESET if the socket is no longer connected */ |
1147 | if (sk->sk_state != IUCV_CONNECTED) { | |
1148 | err = -ECONNRESET; | |
1149 | goto fail; | |
1150 | } | |
b8942e3b | 1151 | |
bb664f49 HB |
1152 | /* increment and save iucv message tag for msg_completion cbk */ |
1153 | txmsg.tag = iucv->send_tag++; | |
1154 | memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); | |
3881ac44 UB |
1155 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1156 | atomic_inc(&iucv->msg_sent); | |
1157 | err = afiucv_hs_send(&txmsg, sk, skb, 0); | |
1158 | if (err) { | |
1159 | atomic_dec(&iucv->msg_sent); | |
1160 | goto fail; | |
1161 | } | |
1162 | goto release; | |
1163 | } | |
bb664f49 | 1164 | skb_queue_tail(&iucv->send_skb_q, skb); |
b8942e3b | 1165 | |
bb664f49 HB |
1166 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
1167 | && skb->len <= 7) { | |
1168 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 1169 | |
bb664f49 HB |
1170 | /* on success: there is no message_complete callback |
1171 | * for an IPRMDATA msg; remove skb from send queue */ | |
1172 | if (err == 0) { | |
1173 | skb_unlink(skb, &iucv->send_skb_q); | |
1174 | kfree_skb(skb); | |
1175 | } | |
1176 | ||
1177 | /* this error should never happen since the | |
1178 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1179 | if (err == 0x15) { | |
6fcd61f7 | 1180 | pr_iucv->path_sever(iucv->path, NULL); |
eac3731b JH |
1181 | skb_unlink(skb, &iucv->send_skb_q); |
1182 | err = -EPIPE; | |
1183 | goto fail; | |
1184 | } | |
bb664f49 | 1185 | } else |
6fcd61f7 | 1186 | err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, |
bb664f49 HB |
1187 | (void *) skb->data, skb->len); |
1188 | if (err) { | |
1189 | if (err == 3) { | |
1190 | user_id[8] = 0; | |
1191 | memcpy(user_id, iucv->dst_user_id, 8); | |
1192 | appl_id[8] = 0; | |
1193 | memcpy(appl_id, iucv->dst_name, 8); | |
1194 | pr_err("Application %s on z/VM guest %s" | |
1195 | " exceeds message limit\n", | |
1196 | appl_id, user_id); | |
0ea920d2 HB |
1197 | err = -EAGAIN; |
1198 | } else | |
1199 | err = -EPIPE; | |
bb664f49 | 1200 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1201 | goto fail; |
eac3731b JH |
1202 | } |
1203 | ||
3881ac44 | 1204 | release: |
eac3731b JH |
1205 | release_sock(sk); |
1206 | return len; | |
1207 | ||
1208 | fail: | |
816abbad UB |
1209 | if (skb->dev) |
1210 | dev_put(skb->dev); | |
eac3731b JH |
1211 | kfree_skb(skb); |
1212 | out: | |
1213 | release_sock(sk); | |
1214 | return err; | |
1215 | } | |
1216 | ||
bf95d20f HB |
1217 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1218 | * | |
1219 | * Locking: must be called with message_q.lock held | |
1220 | */ | |
f0703c80 UB |
1221 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1222 | { | |
1223 | int dataleft, size, copied = 0; | |
1224 | struct sk_buff *nskb; | |
1225 | ||
1226 | dataleft = len; | |
1227 | while (dataleft) { | |
1228 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1229 | size = sk->sk_rcvbuf / 4; | |
1230 | else | |
1231 | size = dataleft; | |
1232 | ||
1233 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1234 | if (!nskb) | |
1235 | return -ENOMEM; | |
1236 | ||
44b1e6b5 HB |
1237 | /* copy target class to control buffer of new skb */ |
1238 | memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); | |
1239 | ||
1240 | /* copy data fragment */ | |
f0703c80 UB |
1241 | memcpy(nskb->data, skb->data + copied, size); |
1242 | copied += size; | |
1243 | dataleft -= size; | |
1244 | ||
1245 | skb_reset_transport_header(nskb); | |
1246 | skb_reset_network_header(nskb); | |
1247 | nskb->len = size; | |
1248 | ||
1249 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1250 | } | |
1251 | ||
1252 | return 0; | |
1253 | } | |
1254 | ||
bf95d20f HB |
1255 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1256 | * | |
1257 | * Locking: must be called with message_q.lock held | |
1258 | */ | |
f0703c80 UB |
1259 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1260 | struct iucv_path *path, | |
1261 | struct iucv_message *msg) | |
1262 | { | |
1263 | int rc; | |
b8942e3b HB |
1264 | unsigned int len; |
1265 | ||
1266 | len = iucv_msg_length(msg); | |
f0703c80 | 1267 | |
44b1e6b5 HB |
1268 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1269 | /* Note: the first 4 bytes are reserved for msg tag */ | |
1270 | memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); | |
1271 | ||
b8942e3b HB |
1272 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1273 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1274 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1275 | skb->data = NULL; | |
1276 | skb->len = 0; | |
1277 | } | |
f0703c80 | 1278 | } else { |
6fcd61f7 FB |
1279 | rc = pr_iucv->message_receive(path, msg, |
1280 | msg->flags & IUCV_IPRMDATA, | |
1281 | skb->data, len, NULL); | |
f0703c80 UB |
1282 | if (rc) { |
1283 | kfree_skb(skb); | |
1284 | return; | |
1285 | } | |
aa8e71f5 HB |
1286 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1287 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1288 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1289 | if (sk->sk_type == SOCK_STREAM && | |
1290 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1291 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1292 | kfree_skb(skb); |
1293 | skb = NULL; | |
1294 | if (rc) { | |
6fcd61f7 | 1295 | pr_iucv->path_sever(path, NULL); |
f0703c80 UB |
1296 | return; |
1297 | } | |
1298 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1299 | } else { | |
1300 | skb_reset_transport_header(skb); | |
1301 | skb_reset_network_header(skb); | |
b8942e3b | 1302 | skb->len = len; |
f0703c80 UB |
1303 | } |
1304 | } | |
1305 | ||
1306 | if (sock_queue_rcv_skb(sk, skb)) | |
1307 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1308 | } | |
1309 | ||
bf95d20f HB |
1310 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1311 | * | |
1312 | * Locking: must be called with message_q.lock held | |
1313 | */ | |
f0703c80 UB |
1314 | static void iucv_process_message_q(struct sock *sk) |
1315 | { | |
1316 | struct iucv_sock *iucv = iucv_sk(sk); | |
1317 | struct sk_buff *skb; | |
1318 | struct sock_msg_q *p, *n; | |
1319 | ||
1320 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1321 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1322 | if (!skb) |
1323 | break; | |
1324 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1325 | list_del(&p->list); | |
1326 | kfree(p); | |
1327 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1328 | break; | |
1329 | } | |
1330 | } | |
1331 | ||
eac3731b JH |
1332 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1333 | struct msghdr *msg, size_t len, int flags) | |
1334 | { | |
1335 | int noblock = flags & MSG_DONTWAIT; | |
1336 | struct sock *sk = sock->sk; | |
561e0360 | 1337 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1338 | unsigned int copied, rlen; |
3881ac44 UB |
1339 | struct sk_buff *skb, *rskb, *cskb, *sskb; |
1340 | int blen; | |
eac3731b JH |
1341 | int err = 0; |
1342 | ||
aac6399c | 1343 | if ((sk->sk_state == IUCV_DISCONN) && |
f0703c80 UB |
1344 | skb_queue_empty(&iucv->backlog_skb_q) && |
1345 | skb_queue_empty(&sk->sk_receive_queue) && | |
1346 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1347 | return 0; |
1348 | ||
eac3731b JH |
1349 | if (flags & (MSG_OOB)) |
1350 | return -EOPNOTSUPP; | |
1351 | ||
60d3705f HB |
1352 | /* receive/dequeue next skb: |
1353 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1354 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1355 | if (!skb) { | |
1356 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1357 | return 0; | |
1358 | return err; | |
1359 | } | |
1360 | ||
aa8e71f5 HB |
1361 | rlen = skb->len; /* real length of skb */ |
1362 | copied = min_t(unsigned int, rlen, len); | |
eac3731b | 1363 | |
561e0360 | 1364 | cskb = skb; |
3881ac44 | 1365 | if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { |
802788bf HB |
1366 | if (!(flags & MSG_PEEK)) |
1367 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1368 | return -EFAULT; | |
eac3731b JH |
1369 | } |
1370 | ||
aa8e71f5 HB |
1371 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1372 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1373 | if (copied < rlen) | |
1374 | msg->msg_flags |= MSG_TRUNC; | |
1375 | /* each iucv message contains a complete record */ | |
1376 | msg->msg_flags |= MSG_EOR; | |
1377 | } | |
eac3731b | 1378 | |
44b1e6b5 HB |
1379 | /* create control message to store iucv msg target class: |
1380 | * get the trgcls from the control buffer of the skb due to | |
1381 | * fragmentation of original iucv message. */ | |
1382 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
1383 | CB_TRGCLS_LEN, CB_TRGCLS(skb)); | |
1384 | if (err) { | |
1385 | if (!(flags & MSG_PEEK)) | |
1386 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1387 | return err; | |
1388 | } | |
1389 | ||
eac3731b JH |
1390 | /* Mark read part of skb as used */ |
1391 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1392 | |
aa8e71f5 HB |
1393 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1394 | if (sk->sk_type == SOCK_STREAM) { | |
1395 | skb_pull(skb, copied); | |
1396 | if (skb->len) { | |
1397 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1398 | goto done; | |
1399 | } | |
eac3731b JH |
1400 | } |
1401 | ||
1402 | kfree_skb(skb); | |
3881ac44 | 1403 | atomic_inc(&iucv->msg_recv); |
561e0360 JH |
1404 | |
1405 | /* Queue backlog skbs */ | |
bf95d20f | 1406 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1407 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1408 | while (rskb) { |
561e0360 | 1409 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1410 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1411 | rskb); |
1412 | break; | |
1413 | } else { | |
f0703c80 | 1414 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1415 | } |
1416 | } | |
f0703c80 | 1417 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1418 | if (!list_empty(&iucv->message_q.list)) |
1419 | iucv_process_message_q(sk); | |
3881ac44 UB |
1420 | if (atomic_read(&iucv->msg_recv) >= |
1421 | iucv->msglimit / 2) { | |
1422 | /* send WIN to peer */ | |
1423 | blen = sizeof(struct af_iucv_trans_hdr) + | |
1424 | ETH_HLEN; | |
1425 | sskb = sock_alloc_send_skb(sk, blen, 1, &err); | |
1426 | if (sskb) { | |
816abbad | 1427 | skb_reserve(sskb, blen); |
3881ac44 UB |
1428 | err = afiucv_hs_send(NULL, sk, sskb, |
1429 | AF_IUCV_FLAG_WIN); | |
1430 | } | |
1431 | if (err) { | |
1432 | sk->sk_state = IUCV_DISCONN; | |
1433 | sk->sk_state_change(sk); | |
1434 | } | |
1435 | } | |
f0703c80 | 1436 | } |
bf95d20f | 1437 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1438 | } |
eac3731b JH |
1439 | |
1440 | done: | |
aa8e71f5 HB |
1441 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1442 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1443 | copied = rlen; | |
1444 | ||
1445 | return copied; | |
eac3731b JH |
1446 | } |
1447 | ||
1448 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1449 | { | |
1450 | struct iucv_sock *isk, *n; | |
1451 | struct sock *sk; | |
1452 | ||
da99f056 | 1453 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1454 | sk = (struct sock *) isk; |
1455 | ||
1456 | if (sk->sk_state == IUCV_CONNECTED) | |
1457 | return POLLIN | POLLRDNORM; | |
1458 | } | |
1459 | ||
1460 | return 0; | |
1461 | } | |
1462 | ||
1463 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1464 | poll_table *wait) | |
1465 | { | |
1466 | struct sock *sk = sock->sk; | |
1467 | unsigned int mask = 0; | |
1468 | ||
aa395145 | 1469 | sock_poll_wait(file, sk_sleep(sk), wait); |
eac3731b JH |
1470 | |
1471 | if (sk->sk_state == IUCV_LISTEN) | |
1472 | return iucv_accept_poll(sk); | |
1473 | ||
1474 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
1475 | mask |= POLLERR; | |
1476 | ||
1477 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1478 | mask |= POLLRDHUP; | |
1479 | ||
1480 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1481 | mask |= POLLHUP; | |
1482 | ||
1483 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1484 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1485 | mask |= POLLIN | POLLRDNORM; |
1486 | ||
1487 | if (sk->sk_state == IUCV_CLOSED) | |
1488 | mask |= POLLHUP; | |
1489 | ||
aac6399c | 1490 | if (sk->sk_state == IUCV_DISCONN) |
561e0360 JH |
1491 | mask |= POLLIN; |
1492 | ||
eac3731b JH |
1493 | if (sock_writeable(sk)) |
1494 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1495 | else | |
1496 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1497 | ||
1498 | return mask; | |
1499 | } | |
1500 | ||
1501 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1502 | { | |
1503 | struct sock *sk = sock->sk; | |
1504 | struct iucv_sock *iucv = iucv_sk(sk); | |
1505 | struct iucv_message txmsg; | |
1506 | int err = 0; | |
eac3731b JH |
1507 | |
1508 | how++; | |
1509 | ||
1510 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1511 | return -EINVAL; | |
1512 | ||
1513 | lock_sock(sk); | |
da99f056 | 1514 | switch (sk->sk_state) { |
e14ad5fa HB |
1515 | case IUCV_DISCONN: |
1516 | case IUCV_CLOSING: | |
eac3731b JH |
1517 | case IUCV_CLOSED: |
1518 | err = -ENOTCONN; | |
1519 | goto fail; | |
1520 | ||
1521 | default: | |
1522 | sk->sk_shutdown |= how; | |
1523 | break; | |
1524 | } | |
1525 | ||
1526 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1527 | txmsg.class = 0; | |
1528 | txmsg.tag = 0; | |
6fcd61f7 FB |
1529 | err = pr_iucv->message_send(iucv->path, &txmsg, IUCV_IPRMDATA, |
1530 | 0, (void *) iprm_shutdown, 8); | |
eac3731b | 1531 | if (err) { |
da99f056 | 1532 | switch (err) { |
eac3731b JH |
1533 | case 1: |
1534 | err = -ENOTCONN; | |
1535 | break; | |
1536 | case 2: | |
1537 | err = -ECONNRESET; | |
1538 | break; | |
1539 | default: | |
1540 | err = -ENOTCONN; | |
1541 | break; | |
1542 | } | |
1543 | } | |
1544 | } | |
1545 | ||
1546 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
6fcd61f7 | 1547 | err = pr_iucv->path_quiesce(iucv->path, NULL); |
eac3731b JH |
1548 | if (err) |
1549 | err = -ENOTCONN; | |
1550 | ||
1551 | skb_queue_purge(&sk->sk_receive_queue); | |
1552 | } | |
1553 | ||
1554 | /* Wake up anyone sleeping in poll */ | |
1555 | sk->sk_state_change(sk); | |
1556 | ||
1557 | fail: | |
1558 | release_sock(sk); | |
1559 | return err; | |
1560 | } | |
1561 | ||
1562 | static int iucv_sock_release(struct socket *sock) | |
1563 | { | |
1564 | struct sock *sk = sock->sk; | |
1565 | int err = 0; | |
1566 | ||
1567 | if (!sk) | |
1568 | return 0; | |
1569 | ||
1570 | iucv_sock_close(sk); | |
1571 | ||
eac3731b JH |
1572 | sock_orphan(sk); |
1573 | iucv_sock_kill(sk); | |
1574 | return err; | |
1575 | } | |
1576 | ||
9d5c5d8f HB |
1577 | /* getsockopt and setsockopt */ |
1578 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1579 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1580 | { |
1581 | struct sock *sk = sock->sk; | |
1582 | struct iucv_sock *iucv = iucv_sk(sk); | |
1583 | int val; | |
1584 | int rc; | |
1585 | ||
1586 | if (level != SOL_IUCV) | |
1587 | return -ENOPROTOOPT; | |
1588 | ||
1589 | if (optlen < sizeof(int)) | |
1590 | return -EINVAL; | |
1591 | ||
1592 | if (get_user(val, (int __user *) optval)) | |
1593 | return -EFAULT; | |
1594 | ||
1595 | rc = 0; | |
1596 | ||
1597 | lock_sock(sk); | |
1598 | switch (optname) { | |
1599 | case SO_IPRMDATA_MSG: | |
1600 | if (val) | |
1601 | iucv->flags |= IUCV_IPRMDATA; | |
1602 | else | |
1603 | iucv->flags &= ~IUCV_IPRMDATA; | |
1604 | break; | |
09488e2e HB |
1605 | case SO_MSGLIMIT: |
1606 | switch (sk->sk_state) { | |
1607 | case IUCV_OPEN: | |
1608 | case IUCV_BOUND: | |
1609 | if (val < 1 || val > (u16)(~0)) | |
1610 | rc = -EINVAL; | |
1611 | else | |
1612 | iucv->msglimit = val; | |
1613 | break; | |
1614 | default: | |
1615 | rc = -EINVAL; | |
1616 | break; | |
1617 | } | |
1618 | break; | |
9d5c5d8f HB |
1619 | default: |
1620 | rc = -ENOPROTOOPT; | |
1621 | break; | |
1622 | } | |
1623 | release_sock(sk); | |
1624 | ||
1625 | return rc; | |
1626 | } | |
1627 | ||
1628 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1629 | char __user *optval, int __user *optlen) | |
1630 | { | |
1631 | struct sock *sk = sock->sk; | |
1632 | struct iucv_sock *iucv = iucv_sk(sk); | |
1633 | int val, len; | |
1634 | ||
1635 | if (level != SOL_IUCV) | |
1636 | return -ENOPROTOOPT; | |
1637 | ||
1638 | if (get_user(len, optlen)) | |
1639 | return -EFAULT; | |
1640 | ||
1641 | if (len < 0) | |
1642 | return -EINVAL; | |
1643 | ||
1644 | len = min_t(unsigned int, len, sizeof(int)); | |
1645 | ||
1646 | switch (optname) { | |
1647 | case SO_IPRMDATA_MSG: | |
1648 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1649 | break; | |
09488e2e HB |
1650 | case SO_MSGLIMIT: |
1651 | lock_sock(sk); | |
1652 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1653 | : iucv->msglimit; /* default */ | |
1654 | release_sock(sk); | |
1655 | break; | |
9d5c5d8f HB |
1656 | default: |
1657 | return -ENOPROTOOPT; | |
1658 | } | |
1659 | ||
1660 | if (put_user(len, optlen)) | |
1661 | return -EFAULT; | |
1662 | if (copy_to_user(optval, &val, len)) | |
1663 | return -EFAULT; | |
1664 | ||
1665 | return 0; | |
1666 | } | |
1667 | ||
1668 | ||
eac3731b JH |
1669 | /* Callback wrappers - called from iucv base support */ |
1670 | static int iucv_callback_connreq(struct iucv_path *path, | |
1671 | u8 ipvmid[8], u8 ipuser[16]) | |
1672 | { | |
1673 | unsigned char user_data[16]; | |
1674 | unsigned char nuser_data[16]; | |
1675 | unsigned char src_name[8]; | |
1676 | struct hlist_node *node; | |
1677 | struct sock *sk, *nsk; | |
1678 | struct iucv_sock *iucv, *niucv; | |
1679 | int err; | |
1680 | ||
1681 | memcpy(src_name, ipuser, 8); | |
1682 | EBCASC(src_name, 8); | |
1683 | /* Find out if this path belongs to af_iucv. */ | |
1684 | read_lock(&iucv_sk_list.lock); | |
1685 | iucv = NULL; | |
febca281 | 1686 | sk = NULL; |
eac3731b JH |
1687 | sk_for_each(sk, node, &iucv_sk_list.head) |
1688 | if (sk->sk_state == IUCV_LISTEN && | |
1689 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1690 | /* | |
1691 | * Found a listening socket with | |
1692 | * src_name == ipuser[0-7]. | |
1693 | */ | |
1694 | iucv = iucv_sk(sk); | |
1695 | break; | |
1696 | } | |
1697 | read_unlock(&iucv_sk_list.lock); | |
1698 | if (!iucv) | |
1699 | /* No socket found, not one of our paths. */ | |
1700 | return -EINVAL; | |
1701 | ||
1702 | bh_lock_sock(sk); | |
1703 | ||
1704 | /* Check if parent socket is listening */ | |
1705 | low_nmcpy(user_data, iucv->src_name); | |
1706 | high_nmcpy(user_data, iucv->dst_name); | |
1707 | ASCEBC(user_data, sizeof(user_data)); | |
1708 | if (sk->sk_state != IUCV_LISTEN) { | |
6fcd61f7 | 1709 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1710 | iucv_path_free(path); |
eac3731b JH |
1711 | goto fail; |
1712 | } | |
1713 | ||
1714 | /* Check for backlog size */ | |
1715 | if (sk_acceptq_is_full(sk)) { | |
6fcd61f7 | 1716 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1717 | iucv_path_free(path); |
eac3731b JH |
1718 | goto fail; |
1719 | } | |
1720 | ||
1721 | /* Create the new socket */ | |
aa8e71f5 | 1722 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
da99f056 | 1723 | if (!nsk) { |
6fcd61f7 | 1724 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1725 | iucv_path_free(path); |
eac3731b JH |
1726 | goto fail; |
1727 | } | |
1728 | ||
1729 | niucv = iucv_sk(nsk); | |
1730 | iucv_sock_init(nsk, sk); | |
1731 | ||
1732 | /* Set the new iucv_sock */ | |
1733 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1734 | EBCASC(niucv->dst_name, 8); | |
1735 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1736 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1737 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1738 | niucv->path = path; | |
1739 | ||
1740 | /* Call iucv_accept */ | |
1741 | high_nmcpy(nuser_data, ipuser + 8); | |
1742 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1743 | ASCEBC(nuser_data + 8, 8); | |
1744 | ||
09488e2e HB |
1745 | /* set message limit for path based on msglimit of accepting socket */ |
1746 | niucv->msglimit = iucv->msglimit; | |
1747 | path->msglim = iucv->msglimit; | |
6fcd61f7 | 1748 | err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1749 | if (err) { |
7d316b94 | 1750 | iucv_sever_path(nsk, 1); |
65dbd7c2 | 1751 | iucv_sock_kill(nsk); |
eac3731b JH |
1752 | goto fail; |
1753 | } | |
1754 | ||
1755 | iucv_accept_enqueue(sk, nsk); | |
1756 | ||
1757 | /* Wake up accept */ | |
1758 | nsk->sk_state = IUCV_CONNECTED; | |
1759 | sk->sk_data_ready(sk, 1); | |
1760 | err = 0; | |
1761 | fail: | |
1762 | bh_unlock_sock(sk); | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1767 | { | |
1768 | struct sock *sk = path->private; | |
1769 | ||
1770 | sk->sk_state = IUCV_CONNECTED; | |
1771 | sk->sk_state_change(sk); | |
1772 | } | |
1773 | ||
1774 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1775 | { | |
1776 | struct sock *sk = path->private; | |
561e0360 | 1777 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1778 | struct sk_buff *skb; |
1779 | struct sock_msg_q *save_msg; | |
1780 | int len; | |
561e0360 | 1781 | |
fe86e54e | 1782 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
6fcd61f7 | 1783 | pr_iucv->message_reject(path, msg); |
eac3731b | 1784 | return; |
fe86e54e | 1785 | } |
eac3731b | 1786 | |
3fa6b5ad | 1787 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1788 | |
f0703c80 UB |
1789 | if (!list_empty(&iucv->message_q.list) || |
1790 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1791 | goto save_message; | |
1792 | ||
1793 | len = atomic_read(&sk->sk_rmem_alloc); | |
87fb4b7b | 1794 | len += SKB_TRUESIZE(iucv_msg_length(msg)); |
f0703c80 UB |
1795 | if (len > sk->sk_rcvbuf) |
1796 | goto save_message; | |
1797 | ||
b8942e3b | 1798 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1799 | if (!skb) |
1800 | goto save_message; | |
eac3731b | 1801 | |
f0703c80 | 1802 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1803 | goto out_unlock; |
eac3731b | 1804 | |
f0703c80 UB |
1805 | save_message: |
1806 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1807 | if (!save_msg) |
a56635a5 | 1808 | goto out_unlock; |
f0703c80 UB |
1809 | save_msg->path = path; |
1810 | save_msg->msg = *msg; | |
eac3731b | 1811 | |
f0703c80 | 1812 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1813 | |
1814 | out_unlock: | |
f0703c80 | 1815 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1816 | } |
1817 | ||
1818 | static void iucv_callback_txdone(struct iucv_path *path, | |
1819 | struct iucv_message *msg) | |
1820 | { | |
1821 | struct sock *sk = path->private; | |
f2a77991 | 1822 | struct sk_buff *this = NULL; |
eac3731b JH |
1823 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1824 | struct sk_buff *list_skb = list->next; | |
1825 | unsigned long flags; | |
1826 | ||
7d316b94 | 1827 | bh_lock_sock(sk); |
f2a77991 | 1828 | if (!skb_queue_empty(list)) { |
561e0360 JH |
1829 | spin_lock_irqsave(&list->lock, flags); |
1830 | ||
f2a77991 | 1831 | while (list_skb != (struct sk_buff *)list) { |
44b1e6b5 | 1832 | if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { |
f2a77991 UB |
1833 | this = list_skb; |
1834 | break; | |
1835 | } | |
561e0360 | 1836 | list_skb = list_skb->next; |
f2a77991 UB |
1837 | } |
1838 | if (this) | |
1839 | __skb_unlink(this, list); | |
561e0360 JH |
1840 | |
1841 | spin_unlock_irqrestore(&list->lock, flags); | |
eac3731b | 1842 | |
0ea920d2 HB |
1843 | if (this) { |
1844 | kfree_skb(this); | |
1845 | /* wake up any process waiting for sending */ | |
1846 | iucv_sock_wake_msglim(sk); | |
1847 | } | |
561e0360 | 1848 | } |
eac3731b | 1849 | |
da99f056 | 1850 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1851 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1852 | sk->sk_state = IUCV_CLOSED; | |
1853 | sk->sk_state_change(sk); | |
1854 | } | |
1855 | } | |
7d316b94 | 1856 | bh_unlock_sock(sk); |
eac3731b | 1857 | |
eac3731b JH |
1858 | } |
1859 | ||
1860 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1861 | { | |
1862 | struct sock *sk = path->private; | |
1863 | ||
7d316b94 UB |
1864 | if (sk->sk_state == IUCV_CLOSED) |
1865 | return; | |
1866 | ||
1867 | bh_lock_sock(sk); | |
1868 | iucv_sever_path(sk, 1); | |
aac6399c | 1869 | sk->sk_state = IUCV_DISCONN; |
eac3731b JH |
1870 | |
1871 | sk->sk_state_change(sk); | |
7d316b94 | 1872 | bh_unlock_sock(sk); |
eac3731b JH |
1873 | } |
1874 | ||
af88b52d HB |
1875 | /* called if the other communication side shuts down its RECV direction; |
1876 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1877 | */ | |
1878 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1879 | { | |
1880 | struct sock *sk = path->private; | |
1881 | ||
1882 | bh_lock_sock(sk); | |
1883 | if (sk->sk_state != IUCV_CLOSED) { | |
1884 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1885 | sk->sk_state_change(sk); | |
1886 | } | |
1887 | bh_unlock_sock(sk); | |
1888 | } | |
1889 | ||
3881ac44 UB |
1890 | /***************** HiperSockets transport callbacks ********************/ |
1891 | static void afiucv_swap_src_dest(struct sk_buff *skb) | |
1892 | { | |
1893 | struct af_iucv_trans_hdr *trans_hdr = | |
1894 | (struct af_iucv_trans_hdr *)skb->data; | |
1895 | char tmpID[8]; | |
1896 | char tmpName[8]; | |
1897 | ||
1898 | ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
1899 | ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
1900 | ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
1901 | ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
1902 | memcpy(tmpID, trans_hdr->srcUserID, 8); | |
1903 | memcpy(tmpName, trans_hdr->srcAppName, 8); | |
1904 | memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); | |
1905 | memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); | |
1906 | memcpy(trans_hdr->destUserID, tmpID, 8); | |
1907 | memcpy(trans_hdr->destAppName, tmpName, 8); | |
1908 | skb_push(skb, ETH_HLEN); | |
1909 | memset(skb->data, 0, ETH_HLEN); | |
1910 | } | |
1911 | ||
1912 | /** | |
1913 | * afiucv_hs_callback_syn - react on received SYN | |
1914 | **/ | |
1915 | static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) | |
1916 | { | |
1917 | struct sock *nsk; | |
1918 | struct iucv_sock *iucv, *niucv; | |
1919 | struct af_iucv_trans_hdr *trans_hdr; | |
1920 | int err; | |
1921 | ||
1922 | iucv = iucv_sk(sk); | |
1923 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
1924 | if (!iucv) { | |
1925 | /* no sock - connection refused */ | |
1926 | afiucv_swap_src_dest(skb); | |
1927 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1928 | err = dev_queue_xmit(skb); | |
1929 | goto out; | |
1930 | } | |
1931 | ||
1932 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); | |
1933 | bh_lock_sock(sk); | |
1934 | if ((sk->sk_state != IUCV_LISTEN) || | |
1935 | sk_acceptq_is_full(sk) || | |
1936 | !nsk) { | |
1937 | /* error on server socket - connection refused */ | |
1938 | if (nsk) | |
1939 | sk_free(nsk); | |
1940 | afiucv_swap_src_dest(skb); | |
1941 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1942 | err = dev_queue_xmit(skb); | |
1943 | bh_unlock_sock(sk); | |
1944 | goto out; | |
1945 | } | |
1946 | ||
1947 | niucv = iucv_sk(nsk); | |
1948 | iucv_sock_init(nsk, sk); | |
1949 | niucv->transport = AF_IUCV_TRANS_HIPER; | |
1950 | niucv->msglimit = iucv->msglimit; | |
1951 | if (!trans_hdr->window) | |
1952 | niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; | |
1953 | else | |
1954 | niucv->msglimit_peer = trans_hdr->window; | |
1955 | memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); | |
1956 | memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); | |
1957 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1958 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1959 | nsk->sk_bound_dev_if = sk->sk_bound_dev_if; | |
1960 | afiucv_swap_src_dest(skb); | |
1961 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; | |
1962 | trans_hdr->window = niucv->msglimit; | |
1963 | /* if receiver acks the xmit connection is established */ | |
1964 | err = dev_queue_xmit(skb); | |
1965 | if (!err) { | |
1966 | iucv_accept_enqueue(sk, nsk); | |
1967 | nsk->sk_state = IUCV_CONNECTED; | |
1968 | sk->sk_data_ready(sk, 1); | |
1969 | } else | |
1970 | iucv_sock_kill(nsk); | |
1971 | bh_unlock_sock(sk); | |
1972 | ||
1973 | out: | |
1974 | return NET_RX_SUCCESS; | |
1975 | } | |
1976 | ||
1977 | /** | |
1978 | * afiucv_hs_callback_synack() - react on received SYN-ACK | |
1979 | **/ | |
1980 | static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) | |
1981 | { | |
1982 | struct iucv_sock *iucv = iucv_sk(sk); | |
1983 | struct af_iucv_trans_hdr *trans_hdr = | |
1984 | (struct af_iucv_trans_hdr *)skb->data; | |
1985 | ||
1986 | if (!iucv) | |
1987 | goto out; | |
1988 | if (sk->sk_state != IUCV_BOUND) | |
1989 | goto out; | |
1990 | bh_lock_sock(sk); | |
1991 | iucv->msglimit_peer = trans_hdr->window; | |
1992 | sk->sk_state = IUCV_CONNECTED; | |
1993 | sk->sk_state_change(sk); | |
1994 | bh_unlock_sock(sk); | |
1995 | out: | |
1996 | kfree_skb(skb); | |
1997 | return NET_RX_SUCCESS; | |
1998 | } | |
1999 | ||
2000 | /** | |
2001 | * afiucv_hs_callback_synfin() - react on received SYN_FIN | |
2002 | **/ | |
2003 | static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) | |
2004 | { | |
2005 | struct iucv_sock *iucv = iucv_sk(sk); | |
2006 | ||
2007 | if (!iucv) | |
2008 | goto out; | |
2009 | if (sk->sk_state != IUCV_BOUND) | |
2010 | goto out; | |
2011 | bh_lock_sock(sk); | |
2012 | sk->sk_state = IUCV_DISCONN; | |
2013 | sk->sk_state_change(sk); | |
2014 | bh_unlock_sock(sk); | |
2015 | out: | |
2016 | kfree_skb(skb); | |
2017 | return NET_RX_SUCCESS; | |
2018 | } | |
2019 | ||
2020 | /** | |
2021 | * afiucv_hs_callback_fin() - react on received FIN | |
2022 | **/ | |
2023 | static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) | |
2024 | { | |
2025 | struct iucv_sock *iucv = iucv_sk(sk); | |
2026 | ||
2027 | /* other end of connection closed */ | |
2028 | if (iucv) { | |
2029 | bh_lock_sock(sk); | |
aac6399c | 2030 | sk->sk_state = IUCV_DISCONN; |
3881ac44 UB |
2031 | sk->sk_state_change(sk); |
2032 | bh_unlock_sock(sk); | |
2033 | } | |
2034 | kfree_skb(skb); | |
2035 | return NET_RX_SUCCESS; | |
2036 | } | |
2037 | ||
2038 | /** | |
2039 | * afiucv_hs_callback_win() - react on received WIN | |
2040 | **/ | |
2041 | static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) | |
2042 | { | |
2043 | struct iucv_sock *iucv = iucv_sk(sk); | |
2044 | struct af_iucv_trans_hdr *trans_hdr = | |
2045 | (struct af_iucv_trans_hdr *)skb->data; | |
2046 | ||
2047 | if (!iucv) | |
2048 | return NET_RX_SUCCESS; | |
2049 | ||
2050 | if (sk->sk_state != IUCV_CONNECTED) | |
2051 | return NET_RX_SUCCESS; | |
2052 | ||
2053 | atomic_sub(trans_hdr->window, &iucv->msg_sent); | |
2054 | iucv_sock_wake_msglim(sk); | |
2055 | return NET_RX_SUCCESS; | |
2056 | } | |
2057 | ||
2058 | /** | |
2059 | * afiucv_hs_callback_rx() - react on received data | |
2060 | **/ | |
2061 | static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) | |
2062 | { | |
2063 | struct iucv_sock *iucv = iucv_sk(sk); | |
2064 | ||
2065 | if (!iucv) { | |
2066 | kfree_skb(skb); | |
2067 | return NET_RX_SUCCESS; | |
2068 | } | |
2069 | ||
2070 | if (sk->sk_state != IUCV_CONNECTED) { | |
2071 | kfree_skb(skb); | |
2072 | return NET_RX_SUCCESS; | |
2073 | } | |
2074 | ||
2075 | /* write stuff from iucv_msg to skb cb */ | |
2076 | if (skb->len <= sizeof(struct af_iucv_trans_hdr)) { | |
2077 | kfree_skb(skb); | |
2078 | return NET_RX_SUCCESS; | |
2079 | } | |
2080 | skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); | |
2081 | skb_reset_transport_header(skb); | |
2082 | skb_reset_network_header(skb); | |
2083 | spin_lock(&iucv->message_q.lock); | |
2084 | if (skb_queue_empty(&iucv->backlog_skb_q)) { | |
2085 | if (sock_queue_rcv_skb(sk, skb)) { | |
2086 | /* handle rcv queue full */ | |
2087 | skb_queue_tail(&iucv->backlog_skb_q, skb); | |
2088 | } | |
2089 | } else | |
2090 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
2091 | spin_unlock(&iucv->message_q.lock); | |
2092 | return NET_RX_SUCCESS; | |
2093 | } | |
2094 | ||
2095 | /** | |
2096 | * afiucv_hs_rcv() - base function for arriving data through HiperSockets | |
2097 | * transport | |
2098 | * called from netif RX softirq | |
2099 | **/ | |
2100 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, | |
2101 | struct packet_type *pt, struct net_device *orig_dev) | |
2102 | { | |
2103 | struct hlist_node *node; | |
2104 | struct sock *sk; | |
2105 | struct iucv_sock *iucv; | |
2106 | struct af_iucv_trans_hdr *trans_hdr; | |
2107 | char nullstring[8]; | |
2108 | int err = 0; | |
2109 | ||
2110 | skb_pull(skb, ETH_HLEN); | |
2111 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
2112 | EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
2113 | EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
2114 | EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
2115 | EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
2116 | memset(nullstring, 0, sizeof(nullstring)); | |
2117 | iucv = NULL; | |
2118 | sk = NULL; | |
2119 | read_lock(&iucv_sk_list.lock); | |
2120 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
2121 | if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { | |
2122 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2123 | trans_hdr->destAppName, 8)) && | |
2124 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2125 | trans_hdr->destUserID, 8)) && | |
2126 | (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && | |
2127 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2128 | nullstring, 8))) { | |
2129 | iucv = iucv_sk(sk); | |
2130 | break; | |
2131 | } | |
2132 | } else { | |
2133 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2134 | trans_hdr->destAppName, 8)) && | |
2135 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2136 | trans_hdr->destUserID, 8)) && | |
2137 | (!memcmp(&iucv_sk(sk)->dst_name, | |
2138 | trans_hdr->srcAppName, 8)) && | |
2139 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2140 | trans_hdr->srcUserID, 8))) { | |
2141 | iucv = iucv_sk(sk); | |
2142 | break; | |
2143 | } | |
2144 | } | |
2145 | } | |
2146 | read_unlock(&iucv_sk_list.lock); | |
2147 | if (!iucv) | |
2148 | sk = NULL; | |
2149 | ||
2150 | /* no sock | |
2151 | how should we send with no sock | |
2152 | 1) send without sock no send rc checking? | |
2153 | 2) introduce default sock to handle this cases | |
2154 | ||
2155 | SYN -> send SYN|ACK in good case, send SYN|FIN in bad case | |
2156 | data -> send FIN | |
2157 | SYN|ACK, SYN|FIN, FIN -> no action? */ | |
2158 | ||
2159 | switch (trans_hdr->flags) { | |
2160 | case AF_IUCV_FLAG_SYN: | |
2161 | /* connect request */ | |
2162 | err = afiucv_hs_callback_syn(sk, skb); | |
2163 | break; | |
2164 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): | |
2165 | /* connect request confirmed */ | |
2166 | err = afiucv_hs_callback_synack(sk, skb); | |
2167 | break; | |
2168 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): | |
2169 | /* connect request refused */ | |
2170 | err = afiucv_hs_callback_synfin(sk, skb); | |
2171 | break; | |
2172 | case (AF_IUCV_FLAG_FIN): | |
2173 | /* close request */ | |
2174 | err = afiucv_hs_callback_fin(sk, skb); | |
2175 | break; | |
2176 | case (AF_IUCV_FLAG_WIN): | |
2177 | err = afiucv_hs_callback_win(sk, skb); | |
2178 | if (skb->len > sizeof(struct af_iucv_trans_hdr)) | |
2179 | err = afiucv_hs_callback_rx(sk, skb); | |
2180 | else | |
2181 | kfree(skb); | |
2182 | break; | |
2183 | case 0: | |
2184 | /* plain data frame */ | |
c64d3f8f UB |
2185 | memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class, |
2186 | CB_TRGCLS_LEN); | |
3881ac44 UB |
2187 | err = afiucv_hs_callback_rx(sk, skb); |
2188 | break; | |
2189 | default: | |
2190 | ; | |
2191 | } | |
2192 | ||
2193 | return err; | |
2194 | } | |
2195 | ||
2196 | /** | |
2197 | * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets | |
2198 | * transport | |
2199 | **/ | |
2200 | static void afiucv_hs_callback_txnotify(struct sk_buff *skb, | |
2201 | enum iucv_tx_notify n) | |
2202 | { | |
2203 | struct sock *isk = skb->sk; | |
2204 | struct sock *sk = NULL; | |
2205 | struct iucv_sock *iucv = NULL; | |
2206 | struct sk_buff_head *list; | |
2207 | struct sk_buff *list_skb; | |
2208 | struct sk_buff *this = NULL; | |
2209 | unsigned long flags; | |
2210 | struct hlist_node *node; | |
2211 | ||
2212 | read_lock(&iucv_sk_list.lock); | |
2213 | sk_for_each(sk, node, &iucv_sk_list.head) | |
2214 | if (sk == isk) { | |
2215 | iucv = iucv_sk(sk); | |
2216 | break; | |
2217 | } | |
2218 | read_unlock(&iucv_sk_list.lock); | |
2219 | ||
2220 | if (!iucv) | |
2221 | return; | |
2222 | ||
2223 | bh_lock_sock(sk); | |
2224 | list = &iucv->send_skb_q; | |
2225 | list_skb = list->next; | |
2226 | if (skb_queue_empty(list)) | |
2227 | goto out_unlock; | |
2228 | ||
2229 | spin_lock_irqsave(&list->lock, flags); | |
2230 | while (list_skb != (struct sk_buff *)list) { | |
2231 | if (skb_shinfo(list_skb) == skb_shinfo(skb)) { | |
2232 | this = list_skb; | |
2233 | switch (n) { | |
2234 | case TX_NOTIFY_OK: | |
2235 | __skb_unlink(this, list); | |
2236 | iucv_sock_wake_msglim(sk); | |
816abbad | 2237 | dev_put(this->dev); |
3881ac44 UB |
2238 | kfree_skb(this); |
2239 | break; | |
2240 | case TX_NOTIFY_PENDING: | |
2241 | atomic_inc(&iucv->pendings); | |
2242 | break; | |
2243 | case TX_NOTIFY_DELAYED_OK: | |
2244 | __skb_unlink(this, list); | |
2245 | atomic_dec(&iucv->pendings); | |
2246 | if (atomic_read(&iucv->pendings) <= 0) | |
2247 | iucv_sock_wake_msglim(sk); | |
816abbad | 2248 | dev_put(this->dev); |
3881ac44 UB |
2249 | kfree_skb(this); |
2250 | break; | |
2251 | case TX_NOTIFY_UNREACHABLE: | |
2252 | case TX_NOTIFY_DELAYED_UNREACHABLE: | |
2253 | case TX_NOTIFY_TPQFULL: /* not yet used */ | |
2254 | case TX_NOTIFY_GENERALERROR: | |
2255 | case TX_NOTIFY_DELAYED_GENERALERROR: | |
2256 | __skb_unlink(this, list); | |
816abbad | 2257 | dev_put(this->dev); |
3881ac44 | 2258 | kfree_skb(this); |
aac6399c | 2259 | sk->sk_state = IUCV_DISCONN; |
3881ac44 UB |
2260 | sk->sk_state_change(sk); |
2261 | break; | |
2262 | } | |
2263 | break; | |
2264 | } | |
2265 | list_skb = list_skb->next; | |
2266 | } | |
2267 | spin_unlock_irqrestore(&list->lock, flags); | |
2268 | ||
42bd48e0 UB |
2269 | if (sk->sk_state == IUCV_CLOSING) { |
2270 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { | |
2271 | sk->sk_state = IUCV_CLOSED; | |
2272 | sk->sk_state_change(sk); | |
2273 | } | |
2274 | } | |
2275 | ||
3881ac44 UB |
2276 | out_unlock: |
2277 | bh_unlock_sock(sk); | |
2278 | } | |
5708e868 | 2279 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
2280 | .family = PF_IUCV, |
2281 | .owner = THIS_MODULE, | |
2282 | .release = iucv_sock_release, | |
2283 | .bind = iucv_sock_bind, | |
2284 | .connect = iucv_sock_connect, | |
2285 | .listen = iucv_sock_listen, | |
2286 | .accept = iucv_sock_accept, | |
2287 | .getname = iucv_sock_getname, | |
2288 | .sendmsg = iucv_sock_sendmsg, | |
2289 | .recvmsg = iucv_sock_recvmsg, | |
2290 | .poll = iucv_sock_poll, | |
2291 | .ioctl = sock_no_ioctl, | |
2292 | .mmap = sock_no_mmap, | |
2293 | .socketpair = sock_no_socketpair, | |
2294 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
2295 | .setsockopt = iucv_sock_setsockopt, |
2296 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
2297 | }; |
2298 | ||
ec1b4cf7 | 2299 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
2300 | .family = AF_IUCV, |
2301 | .owner = THIS_MODULE, | |
2302 | .create = iucv_sock_create, | |
2303 | }; | |
2304 | ||
3881ac44 UB |
2305 | static struct packet_type iucv_packet_type = { |
2306 | .type = cpu_to_be16(ETH_P_AF_IUCV), | |
2307 | .func = afiucv_hs_rcv, | |
2308 | }; | |
2309 | ||
2310 | static int afiucv_iucv_init(void) | |
6fcd61f7 FB |
2311 | { |
2312 | int err; | |
2313 | ||
2314 | err = pr_iucv->iucv_register(&af_iucv_handler, 0); | |
2315 | if (err) | |
2316 | goto out; | |
2317 | /* establish dummy device */ | |
2318 | af_iucv_driver.bus = pr_iucv->bus; | |
2319 | err = driver_register(&af_iucv_driver); | |
2320 | if (err) | |
2321 | goto out_iucv; | |
2322 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
2323 | if (!af_iucv_dev) { | |
2324 | err = -ENOMEM; | |
2325 | goto out_driver; | |
2326 | } | |
2327 | dev_set_name(af_iucv_dev, "af_iucv"); | |
2328 | af_iucv_dev->bus = pr_iucv->bus; | |
2329 | af_iucv_dev->parent = pr_iucv->root; | |
2330 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
2331 | af_iucv_dev->driver = &af_iucv_driver; | |
2332 | err = device_register(af_iucv_dev); | |
2333 | if (err) | |
2334 | goto out_driver; | |
2335 | return 0; | |
2336 | ||
2337 | out_driver: | |
2338 | driver_unregister(&af_iucv_driver); | |
2339 | out_iucv: | |
2340 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2341 | out: | |
2342 | return err; | |
2343 | } | |
2344 | ||
da99f056 | 2345 | static int __init afiucv_init(void) |
eac3731b JH |
2346 | { |
2347 | int err; | |
2348 | ||
3881ac44 UB |
2349 | if (MACHINE_IS_VM) { |
2350 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
2351 | if (unlikely(err)) { | |
2352 | WARN_ON(err); | |
2353 | err = -EPROTONOSUPPORT; | |
2354 | goto out; | |
2355 | } | |
eac3731b | 2356 | |
3881ac44 UB |
2357 | pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); |
2358 | if (!pr_iucv) { | |
2359 | printk(KERN_WARNING "iucv_if lookup failed\n"); | |
2360 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2361 | } | |
2362 | } else { | |
2363 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2364 | pr_iucv = NULL; | |
6fcd61f7 FB |
2365 | } |
2366 | ||
eac3731b JH |
2367 | err = proto_register(&iucv_proto, 0); |
2368 | if (err) | |
6fcd61f7 | 2369 | goto out; |
eac3731b JH |
2370 | err = sock_register(&iucv_sock_family_ops); |
2371 | if (err) | |
2372 | goto out_proto; | |
6fcd61f7 | 2373 | |
3881ac44 UB |
2374 | if (pr_iucv) { |
2375 | err = afiucv_iucv_init(); | |
2376 | if (err) | |
2377 | goto out_sock; | |
2378 | } | |
2379 | dev_add_pack(&iucv_packet_type); | |
eac3731b JH |
2380 | return 0; |
2381 | ||
c23cad92 UB |
2382 | out_sock: |
2383 | sock_unregister(PF_IUCV); | |
eac3731b JH |
2384 | out_proto: |
2385 | proto_unregister(&iucv_proto); | |
eac3731b | 2386 | out: |
6fcd61f7 FB |
2387 | if (pr_iucv) |
2388 | symbol_put(iucv_if); | |
eac3731b JH |
2389 | return err; |
2390 | } | |
2391 | ||
2392 | static void __exit afiucv_exit(void) | |
2393 | { | |
3881ac44 UB |
2394 | if (pr_iucv) { |
2395 | device_unregister(af_iucv_dev); | |
2396 | driver_unregister(&af_iucv_driver); | |
2397 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2398 | symbol_put(iucv_if); | |
2399 | } | |
2400 | dev_remove_pack(&iucv_packet_type); | |
eac3731b JH |
2401 | sock_unregister(PF_IUCV); |
2402 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2403 | } |
2404 | ||
2405 | module_init(afiucv_init); | |
2406 | module_exit(afiucv_exit); | |
2407 | ||
2408 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
2409 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
2410 | MODULE_VERSION(VERSION); | |
2411 | MODULE_LICENSE("GPL"); | |
2412 | MODULE_ALIAS_NETPROTO(PF_IUCV); | |
3881ac44 | 2413 |