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); | |
93 | ||
3881ac44 UB |
94 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, |
95 | struct packet_type *pt, struct net_device *orig_dev); | |
96 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
97 | struct sk_buff *skb, u8 flags); | |
98 | static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); | |
99 | ||
eac3731b JH |
100 | /* Call Back functions */ |
101 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
102 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
103 | static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]); | |
da99f056 HC |
104 | static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8], |
105 | u8 ipuser[16]); | |
eac3731b | 106 | static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]); |
af88b52d | 107 | static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]); |
eac3731b JH |
108 | |
109 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 110 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
111 | .autobind_name = ATOMIC_INIT(0) |
112 | }; | |
113 | ||
114 | static struct iucv_handler af_iucv_handler = { | |
115 | .path_pending = iucv_callback_connreq, | |
116 | .path_complete = iucv_callback_connack, | |
117 | .path_severed = iucv_callback_connrej, | |
118 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
119 | .message_complete = iucv_callback_txdone, |
120 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
121 | }; |
122 | ||
123 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
124 | { | |
125 | memcpy(dst, src, 8); | |
126 | } | |
127 | ||
128 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
129 | { | |
130 | memcpy(&dst[8], src, 8); | |
131 | } | |
132 | ||
816abbad UB |
133 | static void iucv_skb_queue_purge(struct sk_buff_head *list) |
134 | { | |
135 | struct sk_buff *skb; | |
136 | ||
137 | while ((skb = skb_dequeue(list)) != NULL) { | |
138 | if (skb->dev) | |
139 | dev_put(skb->dev); | |
140 | kfree_skb(skb); | |
141 | } | |
142 | } | |
143 | ||
c23cad92 UB |
144 | static int afiucv_pm_prepare(struct device *dev) |
145 | { | |
146 | #ifdef CONFIG_PM_DEBUG | |
147 | printk(KERN_WARNING "afiucv_pm_prepare\n"); | |
148 | #endif | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static void afiucv_pm_complete(struct device *dev) | |
153 | { | |
154 | #ifdef CONFIG_PM_DEBUG | |
155 | printk(KERN_WARNING "afiucv_pm_complete\n"); | |
156 | #endif | |
c23cad92 UB |
157 | } |
158 | ||
159 | /** | |
160 | * afiucv_pm_freeze() - Freeze PM callback | |
161 | * @dev: AFIUCV dummy device | |
162 | * | |
163 | * Sever all established IUCV communication pathes | |
164 | */ | |
165 | static int afiucv_pm_freeze(struct device *dev) | |
166 | { | |
167 | struct iucv_sock *iucv; | |
168 | struct sock *sk; | |
169 | struct hlist_node *node; | |
170 | int err = 0; | |
171 | ||
172 | #ifdef CONFIG_PM_DEBUG | |
173 | printk(KERN_WARNING "afiucv_pm_freeze\n"); | |
174 | #endif | |
175 | read_lock(&iucv_sk_list.lock); | |
176 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
177 | iucv = iucv_sk(sk); | |
816abbad | 178 | iucv_skb_queue_purge(&iucv->send_skb_q); |
c23cad92 UB |
179 | skb_queue_purge(&iucv->backlog_skb_q); |
180 | switch (sk->sk_state) { | |
c23cad92 UB |
181 | case IUCV_DISCONN: |
182 | case IUCV_CLOSING: | |
183 | case IUCV_CONNECTED: | |
184 | if (iucv->path) { | |
6fcd61f7 | 185 | err = pr_iucv->path_sever(iucv->path, NULL); |
c23cad92 UB |
186 | iucv_path_free(iucv->path); |
187 | iucv->path = NULL; | |
188 | } | |
189 | break; | |
190 | case IUCV_OPEN: | |
191 | case IUCV_BOUND: | |
192 | case IUCV_LISTEN: | |
193 | case IUCV_CLOSED: | |
194 | default: | |
195 | break; | |
196 | } | |
197 | } | |
198 | read_unlock(&iucv_sk_list.lock); | |
199 | return err; | |
200 | } | |
201 | ||
202 | /** | |
203 | * afiucv_pm_restore_thaw() - Thaw and restore PM callback | |
204 | * @dev: AFIUCV dummy device | |
205 | * | |
206 | * socket clean up after freeze | |
207 | */ | |
208 | static int afiucv_pm_restore_thaw(struct device *dev) | |
209 | { | |
c23cad92 UB |
210 | struct sock *sk; |
211 | struct hlist_node *node; | |
212 | ||
213 | #ifdef CONFIG_PM_DEBUG | |
214 | printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); | |
215 | #endif | |
216 | read_lock(&iucv_sk_list.lock); | |
217 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
c23cad92 UB |
218 | switch (sk->sk_state) { |
219 | case IUCV_CONNECTED: | |
220 | sk->sk_err = EPIPE; | |
221 | sk->sk_state = IUCV_DISCONN; | |
222 | sk->sk_state_change(sk); | |
223 | break; | |
224 | case IUCV_DISCONN: | |
c23cad92 UB |
225 | case IUCV_CLOSING: |
226 | case IUCV_LISTEN: | |
227 | case IUCV_BOUND: | |
228 | case IUCV_OPEN: | |
229 | default: | |
230 | break; | |
231 | } | |
232 | } | |
233 | read_unlock(&iucv_sk_list.lock); | |
234 | return 0; | |
235 | } | |
236 | ||
47145210 | 237 | static const struct dev_pm_ops afiucv_pm_ops = { |
c23cad92 UB |
238 | .prepare = afiucv_pm_prepare, |
239 | .complete = afiucv_pm_complete, | |
240 | .freeze = afiucv_pm_freeze, | |
241 | .thaw = afiucv_pm_restore_thaw, | |
242 | .restore = afiucv_pm_restore_thaw, | |
243 | }; | |
244 | ||
245 | static struct device_driver af_iucv_driver = { | |
246 | .owner = THIS_MODULE, | |
247 | .name = "afiucv", | |
6fcd61f7 | 248 | .bus = NULL, |
c23cad92 UB |
249 | .pm = &afiucv_pm_ops, |
250 | }; | |
251 | ||
252 | /* dummy device used as trigger for PM functions */ | |
253 | static struct device *af_iucv_dev; | |
254 | ||
b8942e3b HB |
255 | /** |
256 | * iucv_msg_length() - Returns the length of an iucv message. | |
257 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
258 | * | |
259 | * The function returns the length of the specified iucv message @msg of data | |
260 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
261 | * | |
262 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
263 | * data: | |
264 | * PRMDATA[0..6] socket data (max 7 bytes); | |
265 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
266 | * | |
25985edc | 267 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
268 | * value from 0xFF. |
269 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
270 | * notifications (see iucv_sock_shutdown); and further, | |
271 | * if the socket data len is > 7, the function returns 8. | |
272 | * | |
273 | * Use this function to allocate socket buffers to store iucv message data. | |
274 | */ | |
275 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
276 | { | |
277 | size_t datalen; | |
278 | ||
279 | if (msg->flags & IUCV_IPRMDATA) { | |
280 | datalen = 0xff - msg->rmmsg[7]; | |
281 | return (datalen < 8) ? datalen : 8; | |
282 | } | |
283 | return msg->length; | |
284 | } | |
285 | ||
0ea920d2 HB |
286 | /** |
287 | * iucv_sock_in_state() - check for specific states | |
288 | * @sk: sock structure | |
289 | * @state: first iucv sk state | |
290 | * @state: second iucv sk state | |
291 | * | |
292 | * Returns true if the socket in either in the first or second state. | |
293 | */ | |
294 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
295 | { | |
296 | return (sk->sk_state == state || sk->sk_state == state2); | |
297 | } | |
298 | ||
299 | /** | |
300 | * iucv_below_msglim() - function to check if messages can be sent | |
301 | * @sk: sock structure | |
302 | * | |
303 | * Returns true if the send queue length is lower than the message limit. | |
304 | * Always returns true if the socket is not connected (no iucv path for | |
305 | * checking the message limit). | |
306 | */ | |
307 | static inline int iucv_below_msglim(struct sock *sk) | |
308 | { | |
309 | struct iucv_sock *iucv = iucv_sk(sk); | |
310 | ||
311 | if (sk->sk_state != IUCV_CONNECTED) | |
312 | return 1; | |
3881ac44 UB |
313 | if (iucv->transport == AF_IUCV_TRANS_IUCV) |
314 | return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); | |
315 | else | |
316 | return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && | |
317 | (atomic_read(&iucv->pendings) <= 0)); | |
0ea920d2 HB |
318 | } |
319 | ||
320 | /** | |
321 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
322 | */ | |
323 | static void iucv_sock_wake_msglim(struct sock *sk) | |
324 | { | |
43815482 ED |
325 | struct socket_wq *wq; |
326 | ||
327 | rcu_read_lock(); | |
328 | wq = rcu_dereference(sk->sk_wq); | |
329 | if (wq_has_sleeper(wq)) | |
330 | wake_up_interruptible_all(&wq->wait); | |
0ea920d2 | 331 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 332 | rcu_read_unlock(); |
0ea920d2 HB |
333 | } |
334 | ||
3881ac44 UB |
335 | /** |
336 | * afiucv_hs_send() - send a message through HiperSockets transport | |
337 | */ | |
338 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
339 | struct sk_buff *skb, u8 flags) | |
340 | { | |
341 | struct net *net = sock_net(sock); | |
342 | struct iucv_sock *iucv = iucv_sk(sock); | |
343 | struct af_iucv_trans_hdr *phs_hdr; | |
344 | struct sk_buff *nskb; | |
345 | int err, confirm_recv = 0; | |
346 | ||
347 | memset(skb->head, 0, ETH_HLEN); | |
348 | phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, | |
349 | sizeof(struct af_iucv_trans_hdr)); | |
350 | skb_reset_mac_header(skb); | |
351 | skb_reset_network_header(skb); | |
352 | skb_push(skb, ETH_HLEN); | |
353 | skb_reset_mac_header(skb); | |
354 | memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); | |
355 | ||
356 | phs_hdr->magic = ETH_P_AF_IUCV; | |
357 | phs_hdr->version = 1; | |
358 | phs_hdr->flags = flags; | |
359 | if (flags == AF_IUCV_FLAG_SYN) | |
360 | phs_hdr->window = iucv->msglimit; | |
361 | else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { | |
362 | confirm_recv = atomic_read(&iucv->msg_recv); | |
363 | phs_hdr->window = confirm_recv; | |
364 | if (confirm_recv) | |
365 | phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; | |
366 | } | |
367 | memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); | |
368 | memcpy(phs_hdr->destAppName, iucv->dst_name, 8); | |
369 | memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); | |
370 | memcpy(phs_hdr->srcAppName, iucv->src_name, 8); | |
371 | ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); | |
372 | ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); | |
373 | ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); | |
374 | ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); | |
375 | if (imsg) | |
376 | memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); | |
377 | ||
816abbad | 378 | skb->dev = dev_get_by_index(net, sock->sk_bound_dev_if); |
3881ac44 UB |
379 | if (!skb->dev) |
380 | return -ENODEV; | |
381 | if (!(skb->dev->flags & IFF_UP)) | |
382 | return -ENETDOWN; | |
383 | if (skb->len > skb->dev->mtu) { | |
384 | if (sock->sk_type == SOCK_SEQPACKET) | |
385 | return -EMSGSIZE; | |
386 | else | |
387 | skb_trim(skb, skb->dev->mtu); | |
388 | } | |
389 | skb->protocol = ETH_P_AF_IUCV; | |
390 | skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF; | |
391 | nskb = skb_clone(skb, GFP_ATOMIC); | |
392 | if (!nskb) | |
393 | return -ENOMEM; | |
394 | skb_queue_tail(&iucv->send_skb_q, nskb); | |
395 | err = dev_queue_xmit(skb); | |
396 | if (err) { | |
397 | skb_unlink(nskb, &iucv->send_skb_q); | |
816abbad | 398 | dev_put(nskb->dev); |
3881ac44 UB |
399 | kfree_skb(nskb); |
400 | } else { | |
401 | atomic_sub(confirm_recv, &iucv->msg_recv); | |
402 | WARN_ON(atomic_read(&iucv->msg_recv) < 0); | |
403 | } | |
404 | return err; | |
405 | } | |
406 | ||
eac3731b JH |
407 | static struct sock *__iucv_get_sock_by_name(char *nm) |
408 | { | |
409 | struct sock *sk; | |
410 | struct hlist_node *node; | |
411 | ||
412 | sk_for_each(sk, node, &iucv_sk_list.head) | |
413 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) | |
414 | return sk; | |
415 | ||
416 | return NULL; | |
417 | } | |
418 | ||
419 | static void iucv_sock_destruct(struct sock *sk) | |
420 | { | |
421 | skb_queue_purge(&sk->sk_receive_queue); | |
422 | skb_queue_purge(&sk->sk_write_queue); | |
423 | } | |
424 | ||
425 | /* Cleanup Listen */ | |
426 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
427 | { | |
428 | struct sock *sk; | |
429 | ||
430 | /* Close non-accepted connections */ | |
431 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
432 | iucv_sock_close(sk); | |
433 | iucv_sock_kill(sk); | |
434 | } | |
435 | ||
436 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
437 | } |
438 | ||
7514bab0 | 439 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
440 | static void iucv_sock_kill(struct sock *sk) |
441 | { | |
442 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
443 | return; | |
444 | ||
445 | iucv_sock_unlink(&iucv_sk_list, sk); | |
446 | sock_set_flag(sk, SOCK_DEAD); | |
447 | sock_put(sk); | |
448 | } | |
449 | ||
450 | /* Close an IUCV socket */ | |
451 | static void iucv_sock_close(struct sock *sk) | |
452 | { | |
453 | unsigned char user_data[16]; | |
454 | struct iucv_sock *iucv = iucv_sk(sk); | |
561e0360 | 455 | unsigned long timeo; |
3881ac44 UB |
456 | int err, blen; |
457 | struct sk_buff *skb; | |
eac3731b | 458 | |
eac3731b JH |
459 | lock_sock(sk); |
460 | ||
da99f056 | 461 | switch (sk->sk_state) { |
eac3731b JH |
462 | case IUCV_LISTEN: |
463 | iucv_sock_cleanup_listen(sk); | |
464 | break; | |
465 | ||
466 | case IUCV_CONNECTED: | |
3881ac44 UB |
467 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
468 | /* send fin */ | |
469 | blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
470 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
471 | if (skb) { | |
816abbad | 472 | skb_reserve(skb, blen); |
3881ac44 UB |
473 | err = afiucv_hs_send(NULL, sk, skb, |
474 | AF_IUCV_FLAG_FIN); | |
475 | } | |
476 | sk->sk_state = IUCV_DISCONN; | |
477 | sk->sk_state_change(sk); | |
478 | } | |
816abbad | 479 | case IUCV_DISCONN: /* fall through */ |
561e0360 JH |
480 | sk->sk_state = IUCV_CLOSING; |
481 | sk->sk_state_change(sk); | |
482 | ||
da99f056 | 483 | if (!skb_queue_empty(&iucv->send_skb_q)) { |
561e0360 JH |
484 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
485 | timeo = sk->sk_lingertime; | |
486 | else | |
487 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 488 | iucv_sock_wait(sk, |
0ea920d2 HB |
489 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
490 | timeo); | |
561e0360 JH |
491 | } |
492 | ||
bbe188c8 | 493 | case IUCV_CLOSING: /* fall through */ |
561e0360 JH |
494 | sk->sk_state = IUCV_CLOSED; |
495 | sk->sk_state_change(sk); | |
496 | ||
eac3731b JH |
497 | if (iucv->path) { |
498 | low_nmcpy(user_data, iucv->src_name); | |
499 | high_nmcpy(user_data, iucv->dst_name); | |
500 | ASCEBC(user_data, sizeof(user_data)); | |
6fcd61f7 | 501 | pr_iucv->path_sever(iucv->path, user_data); |
eac3731b JH |
502 | iucv_path_free(iucv->path); |
503 | iucv->path = NULL; | |
504 | } | |
505 | ||
eac3731b JH |
506 | sk->sk_err = ECONNRESET; |
507 | sk->sk_state_change(sk); | |
508 | ||
816abbad | 509 | iucv_skb_queue_purge(&iucv->send_skb_q); |
561e0360 | 510 | skb_queue_purge(&iucv->backlog_skb_q); |
eac3731b JH |
511 | break; |
512 | ||
513 | default: | |
7514bab0 | 514 | /* nothing to do here */ |
eac3731b | 515 | break; |
3ff50b79 | 516 | } |
eac3731b | 517 | |
7514bab0 HB |
518 | /* mark socket for deletion by iucv_sock_kill() */ |
519 | sock_set_flag(sk, SOCK_ZAPPED); | |
520 | ||
eac3731b | 521 | release_sock(sk); |
eac3731b JH |
522 | } |
523 | ||
524 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
525 | { | |
526 | if (parent) | |
527 | sk->sk_type = parent->sk_type; | |
528 | } | |
529 | ||
530 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) | |
531 | { | |
532 | struct sock *sk; | |
493d3971 | 533 | struct iucv_sock *iucv; |
eac3731b | 534 | |
6257ff21 | 535 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto); |
eac3731b JH |
536 | if (!sk) |
537 | return NULL; | |
493d3971 | 538 | iucv = iucv_sk(sk); |
eac3731b JH |
539 | |
540 | sock_init_data(sock, sk); | |
493d3971 UB |
541 | INIT_LIST_HEAD(&iucv->accept_q); |
542 | spin_lock_init(&iucv->accept_q_lock); | |
543 | skb_queue_head_init(&iucv->send_skb_q); | |
544 | INIT_LIST_HEAD(&iucv->message_q.list); | |
545 | spin_lock_init(&iucv->message_q.lock); | |
546 | skb_queue_head_init(&iucv->backlog_skb_q); | |
547 | iucv->send_tag = 0; | |
3881ac44 | 548 | atomic_set(&iucv->pendings, 0); |
493d3971 | 549 | iucv->flags = 0; |
3881ac44 UB |
550 | iucv->msglimit = 0; |
551 | atomic_set(&iucv->msg_sent, 0); | |
552 | atomic_set(&iucv->msg_recv, 0); | |
493d3971 | 553 | iucv->path = NULL; |
3881ac44 | 554 | iucv->sk_txnotify = afiucv_hs_callback_txnotify; |
493d3971 | 555 | memset(&iucv->src_user_id , 0, 32); |
3881ac44 UB |
556 | if (pr_iucv) |
557 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
558 | else | |
559 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
eac3731b JH |
560 | |
561 | sk->sk_destruct = iucv_sock_destruct; | |
562 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
563 | sk->sk_allocation = GFP_DMA; | |
564 | ||
565 | sock_reset_flag(sk, SOCK_ZAPPED); | |
566 | ||
567 | sk->sk_protocol = proto; | |
568 | sk->sk_state = IUCV_OPEN; | |
569 | ||
eac3731b JH |
570 | iucv_sock_link(&iucv_sk_list, sk); |
571 | return sk; | |
572 | } | |
573 | ||
574 | /* Create an IUCV socket */ | |
3f378b68 EP |
575 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
576 | int kern) | |
eac3731b JH |
577 | { |
578 | struct sock *sk; | |
579 | ||
aa8e71f5 HB |
580 | if (protocol && protocol != PF_IUCV) |
581 | return -EPROTONOSUPPORT; | |
eac3731b JH |
582 | |
583 | sock->state = SS_UNCONNECTED; | |
aa8e71f5 HB |
584 | |
585 | switch (sock->type) { | |
586 | case SOCK_STREAM: | |
587 | sock->ops = &iucv_sock_ops; | |
588 | break; | |
589 | case SOCK_SEQPACKET: | |
590 | /* currently, proto ops can handle both sk types */ | |
591 | sock->ops = &iucv_sock_ops; | |
592 | break; | |
593 | default: | |
594 | return -ESOCKTNOSUPPORT; | |
595 | } | |
eac3731b JH |
596 | |
597 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL); | |
598 | if (!sk) | |
599 | return -ENOMEM; | |
600 | ||
601 | iucv_sock_init(sk, NULL); | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
606 | void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) | |
607 | { | |
608 | write_lock_bh(&l->lock); | |
609 | sk_add_node(sk, &l->head); | |
610 | write_unlock_bh(&l->lock); | |
611 | } | |
612 | ||
613 | void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
614 | { | |
615 | write_lock_bh(&l->lock); | |
616 | sk_del_node_init(sk); | |
617 | write_unlock_bh(&l->lock); | |
618 | } | |
619 | ||
620 | void iucv_accept_enqueue(struct sock *parent, struct sock *sk) | |
621 | { | |
febca281 UB |
622 | unsigned long flags; |
623 | struct iucv_sock *par = iucv_sk(parent); | |
624 | ||
eac3731b | 625 | sock_hold(sk); |
febca281 UB |
626 | spin_lock_irqsave(&par->accept_q_lock, flags); |
627 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
628 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 629 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 630 | sk_acceptq_added(parent); |
eac3731b JH |
631 | } |
632 | ||
633 | void iucv_accept_unlink(struct sock *sk) | |
634 | { | |
febca281 UB |
635 | unsigned long flags; |
636 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
637 | ||
638 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 639 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 640 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 641 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
642 | iucv_sk(sk)->parent = NULL; |
643 | sock_put(sk); | |
644 | } | |
645 | ||
646 | struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) | |
647 | { | |
648 | struct iucv_sock *isk, *n; | |
649 | struct sock *sk; | |
650 | ||
da99f056 | 651 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
652 | sk = (struct sock *) isk; |
653 | lock_sock(sk); | |
654 | ||
655 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 656 | iucv_accept_unlink(sk); |
febca281 | 657 | release_sock(sk); |
eac3731b JH |
658 | continue; |
659 | } | |
660 | ||
661 | if (sk->sk_state == IUCV_CONNECTED || | |
aac6399c | 662 | sk->sk_state == IUCV_DISCONN || |
eac3731b JH |
663 | !newsock) { |
664 | iucv_accept_unlink(sk); | |
665 | if (newsock) | |
666 | sock_graft(sk, newsock); | |
667 | ||
eac3731b JH |
668 | release_sock(sk); |
669 | return sk; | |
670 | } | |
671 | ||
672 | release_sock(sk); | |
673 | } | |
674 | return NULL; | |
675 | } | |
676 | ||
eac3731b JH |
677 | /* Bind an unbound socket */ |
678 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
679 | int addr_len) | |
680 | { | |
681 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
682 | struct sock *sk = sock->sk; | |
683 | struct iucv_sock *iucv; | |
3881ac44 UB |
684 | int err = 0; |
685 | struct net_device *dev; | |
686 | char uid[9]; | |
eac3731b JH |
687 | |
688 | /* Verify the input sockaddr */ | |
689 | if (!addr || addr->sa_family != AF_IUCV) | |
690 | return -EINVAL; | |
691 | ||
692 | lock_sock(sk); | |
693 | if (sk->sk_state != IUCV_OPEN) { | |
694 | err = -EBADFD; | |
695 | goto done; | |
696 | } | |
697 | ||
698 | write_lock_bh(&iucv_sk_list.lock); | |
699 | ||
700 | iucv = iucv_sk(sk); | |
701 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
702 | err = -EADDRINUSE; | |
703 | goto done_unlock; | |
704 | } | |
3881ac44 | 705 | if (iucv->path) |
eac3731b | 706 | goto done_unlock; |
eac3731b JH |
707 | |
708 | /* Bind the socket */ | |
eac3731b | 709 | |
3881ac44 UB |
710 | if (pr_iucv) |
711 | if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) | |
712 | goto vm_bind; /* VM IUCV transport */ | |
eac3731b | 713 | |
3881ac44 UB |
714 | /* try hiper transport */ |
715 | memcpy(uid, sa->siucv_user_id, sizeof(uid)); | |
716 | ASCEBC(uid, 8); | |
717 | rcu_read_lock(); | |
718 | for_each_netdev_rcu(&init_net, dev) { | |
719 | if (!memcmp(dev->perm_addr, uid, 8)) { | |
720 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
721 | memcpy(iucv->src_user_id, sa->siucv_user_id, 8); | |
816abbad | 722 | sk->sk_bound_dev_if = dev->ifindex; |
3881ac44 UB |
723 | sk->sk_state = IUCV_BOUND; |
724 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
725 | if (!iucv->msglimit) | |
726 | iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; | |
727 | rcu_read_unlock(); | |
728 | goto done_unlock; | |
729 | } | |
730 | } | |
731 | rcu_read_unlock(); | |
732 | vm_bind: | |
733 | if (pr_iucv) { | |
734 | /* use local userid for backward compat */ | |
735 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
736 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
737 | sk->sk_state = IUCV_BOUND; | |
738 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
739 | if (!iucv->msglimit) | |
740 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
741 | goto done_unlock; | |
742 | } | |
743 | /* found no dev to bind */ | |
744 | err = -ENODEV; | |
eac3731b JH |
745 | done_unlock: |
746 | /* Release the socket list lock */ | |
747 | write_unlock_bh(&iucv_sk_list.lock); | |
748 | done: | |
749 | release_sock(sk); | |
750 | return err; | |
751 | } | |
752 | ||
753 | /* Automatically bind an unbound socket */ | |
754 | static int iucv_sock_autobind(struct sock *sk) | |
755 | { | |
756 | struct iucv_sock *iucv = iucv_sk(sk); | |
eac3731b JH |
757 | char name[12]; |
758 | int err = 0; | |
759 | ||
aac6399c | 760 | if (unlikely(!pr_iucv)) |
eac3731b JH |
761 | return -EPROTO; |
762 | ||
aac6399c | 763 | memcpy(iucv->src_user_id, iucv_userid, 8); |
eac3731b JH |
764 | |
765 | write_lock_bh(&iucv_sk_list.lock); | |
766 | ||
767 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
768 | while (__iucv_get_sock_by_name(name)) { | |
769 | sprintf(name, "%08x", | |
770 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
771 | } | |
772 | ||
773 | write_unlock_bh(&iucv_sk_list.lock); | |
774 | ||
775 | memcpy(&iucv->src_name, name, 8); | |
776 | ||
3881ac44 UB |
777 | if (!iucv->msglimit) |
778 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
779 | ||
eac3731b JH |
780 | return err; |
781 | } | |
782 | ||
3881ac44 UB |
783 | static int afiucv_hs_connect(struct socket *sock) |
784 | { | |
785 | struct sock *sk = sock->sk; | |
786 | struct sk_buff *skb; | |
787 | int blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; | |
788 | int err = 0; | |
789 | ||
790 | /* send syn */ | |
791 | skb = sock_alloc_send_skb(sk, blen, 1, &err); | |
792 | if (!skb) { | |
793 | err = -ENOMEM; | |
794 | goto done; | |
795 | } | |
796 | skb->dev = NULL; | |
797 | skb_reserve(skb, blen); | |
798 | err = afiucv_hs_send(NULL, sk, skb, AF_IUCV_FLAG_SYN); | |
799 | done: | |
800 | return err; | |
801 | } | |
802 | ||
803 | static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) | |
eac3731b JH |
804 | { |
805 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
806 | struct sock *sk = sock->sk; | |
493d3971 | 807 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
808 | unsigned char user_data[16]; |
809 | int err; | |
810 | ||
eac3731b | 811 | high_nmcpy(user_data, sa->siucv_name); |
493d3971 | 812 | low_nmcpy(user_data, iucv->src_name); |
eac3731b JH |
813 | ASCEBC(user_data, sizeof(user_data)); |
814 | ||
eac3731b | 815 | /* Create path. */ |
09488e2e | 816 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 817 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
818 | if (!iucv->path) { |
819 | err = -ENOMEM; | |
820 | goto done; | |
821 | } | |
6fcd61f7 FB |
822 | err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
823 | sa->siucv_user_id, NULL, user_data, | |
824 | sk); | |
eac3731b JH |
825 | if (err) { |
826 | iucv_path_free(iucv->path); | |
827 | iucv->path = NULL; | |
55cdea9e HB |
828 | switch (err) { |
829 | case 0x0b: /* Target communicator is not logged on */ | |
830 | err = -ENETUNREACH; | |
831 | break; | |
832 | case 0x0d: /* Max connections for this guest exceeded */ | |
833 | case 0x0e: /* Max connections for target guest exceeded */ | |
834 | err = -EAGAIN; | |
835 | break; | |
836 | case 0x0f: /* Missing IUCV authorization */ | |
837 | err = -EACCES; | |
838 | break; | |
839 | default: | |
840 | err = -ECONNREFUSED; | |
841 | break; | |
842 | } | |
eac3731b | 843 | } |
3881ac44 UB |
844 | done: |
845 | return err; | |
846 | } | |
eac3731b | 847 | |
3881ac44 UB |
848 | /* Connect an unconnected socket */ |
849 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
850 | int alen, int flags) | |
851 | { | |
852 | struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; | |
853 | struct sock *sk = sock->sk; | |
854 | struct iucv_sock *iucv = iucv_sk(sk); | |
855 | int err; | |
856 | ||
857 | if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) | |
858 | return -EINVAL; | |
859 | ||
860 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
861 | return -EBADFD; | |
862 | ||
863 | if (sk->sk_state == IUCV_OPEN && | |
864 | iucv->transport == AF_IUCV_TRANS_HIPER) | |
865 | return -EBADFD; /* explicit bind required */ | |
866 | ||
867 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) | |
868 | return -EINVAL; | |
869 | ||
870 | if (sk->sk_state == IUCV_OPEN) { | |
871 | err = iucv_sock_autobind(sk); | |
872 | if (unlikely(err)) | |
873 | return err; | |
874 | } | |
875 | ||
876 | lock_sock(sk); | |
877 | ||
878 | /* Set the destination information */ | |
879 | memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); | |
880 | memcpy(iucv->dst_name, sa->siucv_name, 8); | |
881 | ||
882 | if (iucv->transport == AF_IUCV_TRANS_HIPER) | |
883 | err = afiucv_hs_connect(sock); | |
884 | else | |
885 | err = afiucv_path_connect(sock, addr); | |
886 | if (err) | |
887 | goto done; | |
888 | ||
889 | if (sk->sk_state != IUCV_CONNECTED) | |
0ea920d2 HB |
890 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
891 | IUCV_DISCONN), | |
892 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b | 893 | |
3881ac44 | 894 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
b8942e3b | 895 | err = -ECONNREFUSED; |
18becbc5 | 896 | |
3881ac44 | 897 | if (err && iucv->transport == AF_IUCV_TRANS_IUCV) { |
6fcd61f7 | 898 | pr_iucv->path_sever(iucv->path, NULL); |
18becbc5 UB |
899 | iucv_path_free(iucv->path); |
900 | iucv->path = NULL; | |
901 | } | |
902 | ||
eac3731b JH |
903 | done: |
904 | release_sock(sk); | |
905 | return err; | |
906 | } | |
907 | ||
908 | /* Move a socket into listening state. */ | |
909 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
910 | { | |
911 | struct sock *sk = sock->sk; | |
912 | int err; | |
913 | ||
914 | lock_sock(sk); | |
915 | ||
916 | err = -EINVAL; | |
aa8e71f5 HB |
917 | if (sk->sk_state != IUCV_BOUND) |
918 | goto done; | |
919 | ||
920 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
921 | goto done; |
922 | ||
923 | sk->sk_max_ack_backlog = backlog; | |
924 | sk->sk_ack_backlog = 0; | |
925 | sk->sk_state = IUCV_LISTEN; | |
926 | err = 0; | |
927 | ||
928 | done: | |
929 | release_sock(sk); | |
930 | return err; | |
931 | } | |
932 | ||
933 | /* Accept a pending connection */ | |
934 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
935 | int flags) | |
936 | { | |
937 | DECLARE_WAITQUEUE(wait, current); | |
938 | struct sock *sk = sock->sk, *nsk; | |
939 | long timeo; | |
940 | int err = 0; | |
941 | ||
561e0360 | 942 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
943 | |
944 | if (sk->sk_state != IUCV_LISTEN) { | |
945 | err = -EBADFD; | |
946 | goto done; | |
947 | } | |
948 | ||
949 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
950 | ||
951 | /* Wait for an incoming connection */ | |
aa395145 | 952 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 953 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
954 | set_current_state(TASK_INTERRUPTIBLE); |
955 | if (!timeo) { | |
956 | err = -EAGAIN; | |
957 | break; | |
958 | } | |
959 | ||
960 | release_sock(sk); | |
961 | timeo = schedule_timeout(timeo); | |
561e0360 | 962 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
963 | |
964 | if (sk->sk_state != IUCV_LISTEN) { | |
965 | err = -EBADFD; | |
966 | break; | |
967 | } | |
968 | ||
969 | if (signal_pending(current)) { | |
970 | err = sock_intr_errno(timeo); | |
971 | break; | |
972 | } | |
973 | } | |
974 | ||
975 | set_current_state(TASK_RUNNING); | |
aa395145 | 976 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
977 | |
978 | if (err) | |
979 | goto done; | |
980 | ||
981 | newsock->state = SS_CONNECTED; | |
982 | ||
983 | done: | |
984 | release_sock(sk); | |
985 | return err; | |
986 | } | |
987 | ||
988 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
989 | int *len, int peer) | |
990 | { | |
991 | struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; | |
992 | struct sock *sk = sock->sk; | |
493d3971 | 993 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
994 | |
995 | addr->sa_family = AF_IUCV; | |
996 | *len = sizeof(struct sockaddr_iucv); | |
997 | ||
998 | if (peer) { | |
493d3971 UB |
999 | memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
1000 | memcpy(siucv->siucv_name, iucv->dst_name, 8); | |
eac3731b | 1001 | } else { |
493d3971 UB |
1002 | memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
1003 | memcpy(siucv->siucv_name, iucv->src_name, 8); | |
eac3731b JH |
1004 | } |
1005 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
1006 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
493d3971 | 1007 | memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
eac3731b JH |
1008 | |
1009 | return 0; | |
1010 | } | |
1011 | ||
b8942e3b HB |
1012 | /** |
1013 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
1014 | * @path: IUCV path | |
1015 | * @msg: Pointer to a struct iucv_message | |
1016 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
1017 | * | |
1018 | * Send the socket data in the parameter list in the iucv message | |
1019 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
1020 | * list and the socket data len at index 7 (last byte). | |
1021 | * See also iucv_msg_length(). | |
1022 | * | |
1023 | * Returns the error code from the iucv_message_send() call. | |
1024 | */ | |
1025 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
1026 | struct sk_buff *skb) | |
1027 | { | |
1028 | u8 prmdata[8]; | |
1029 | ||
1030 | memcpy(prmdata, (void *) skb->data, skb->len); | |
1031 | prmdata[7] = 0xff - (u8) skb->len; | |
6fcd61f7 | 1032 | return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
b8942e3b HB |
1033 | (void *) prmdata, 8); |
1034 | } | |
1035 | ||
eac3731b JH |
1036 | static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
1037 | struct msghdr *msg, size_t len) | |
1038 | { | |
1039 | struct sock *sk = sock->sk; | |
1040 | struct iucv_sock *iucv = iucv_sk(sk); | |
1041 | struct sk_buff *skb; | |
1042 | struct iucv_message txmsg; | |
44b1e6b5 HB |
1043 | struct cmsghdr *cmsg; |
1044 | int cmsg_done; | |
0ea920d2 | 1045 | long timeo; |
8f7c502c UB |
1046 | char user_id[9]; |
1047 | char appl_id[9]; | |
eac3731b | 1048 | int err; |
0ea920d2 | 1049 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
1050 | |
1051 | err = sock_error(sk); | |
1052 | if (err) | |
1053 | return err; | |
1054 | ||
1055 | if (msg->msg_flags & MSG_OOB) | |
1056 | return -EOPNOTSUPP; | |
1057 | ||
aa8e71f5 HB |
1058 | /* SOCK_SEQPACKET: we do not support segmented records */ |
1059 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
1060 | return -EOPNOTSUPP; | |
1061 | ||
eac3731b JH |
1062 | lock_sock(sk); |
1063 | ||
1064 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1065 | err = -EPIPE; | |
1066 | goto out; | |
1067 | } | |
1068 | ||
bb664f49 HB |
1069 | /* Return if the socket is not in connected state */ |
1070 | if (sk->sk_state != IUCV_CONNECTED) { | |
1071 | err = -ENOTCONN; | |
1072 | goto out; | |
1073 | } | |
44b1e6b5 | 1074 | |
bb664f49 HB |
1075 | /* initialize defaults */ |
1076 | cmsg_done = 0; /* check for duplicate headers */ | |
1077 | txmsg.class = 0; | |
44b1e6b5 | 1078 | |
bb664f49 HB |
1079 | /* iterate over control messages */ |
1080 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; | |
1081 | cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
44b1e6b5 | 1082 | |
bb664f49 HB |
1083 | if (!CMSG_OK(msg, cmsg)) { |
1084 | err = -EINVAL; | |
1085 | goto out; | |
1086 | } | |
44b1e6b5 | 1087 | |
bb664f49 HB |
1088 | if (cmsg->cmsg_level != SOL_IUCV) |
1089 | continue; | |
44b1e6b5 | 1090 | |
bb664f49 HB |
1091 | if (cmsg->cmsg_type & cmsg_done) { |
1092 | err = -EINVAL; | |
1093 | goto out; | |
1094 | } | |
1095 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 1096 | |
bb664f49 HB |
1097 | switch (cmsg->cmsg_type) { |
1098 | case SCM_IUCV_TRGCLS: | |
1099 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
1100 | err = -EINVAL; |
1101 | goto out; | |
1102 | } | |
44b1e6b5 | 1103 | |
bb664f49 HB |
1104 | /* set iucv message target class */ |
1105 | memcpy(&txmsg.class, | |
1106 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 1107 | |
bb664f49 | 1108 | break; |
44b1e6b5 | 1109 | |
bb664f49 HB |
1110 | default: |
1111 | err = -EINVAL; | |
1112 | goto out; | |
1113 | break; | |
44b1e6b5 | 1114 | } |
bb664f49 | 1115 | } |
44b1e6b5 | 1116 | |
bb664f49 HB |
1117 | /* allocate one skb for each iucv message: |
1118 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
1119 | * segmented records using the MSG_EOR flag), but | |
1120 | * for SOCK_STREAM we might want to improve it in future */ | |
3881ac44 UB |
1121 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1122 | skb = sock_alloc_send_skb(sk, | |
1123 | len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, | |
1124 | noblock, &err); | |
1125 | else | |
1126 | skb = sock_alloc_send_skb(sk, len, noblock, &err); | |
bb664f49 HB |
1127 | if (!skb) |
1128 | goto out; | |
3881ac44 UB |
1129 | if (iucv->transport == AF_IUCV_TRANS_HIPER) |
1130 | skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); | |
bb664f49 HB |
1131 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
1132 | err = -EFAULT; | |
1133 | goto fail; | |
1134 | } | |
eac3731b | 1135 | |
0ea920d2 HB |
1136 | /* wait if outstanding messages for iucv path has reached */ |
1137 | timeo = sock_sndtimeo(sk, noblock); | |
1138 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
1139 | if (err) | |
1140 | goto fail; | |
eac3731b | 1141 | |
0ea920d2 HB |
1142 | /* return -ECONNRESET if the socket is no longer connected */ |
1143 | if (sk->sk_state != IUCV_CONNECTED) { | |
1144 | err = -ECONNRESET; | |
1145 | goto fail; | |
1146 | } | |
b8942e3b | 1147 | |
bb664f49 HB |
1148 | /* increment and save iucv message tag for msg_completion cbk */ |
1149 | txmsg.tag = iucv->send_tag++; | |
1150 | memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); | |
3881ac44 UB |
1151 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1152 | atomic_inc(&iucv->msg_sent); | |
1153 | err = afiucv_hs_send(&txmsg, sk, skb, 0); | |
1154 | if (err) { | |
1155 | atomic_dec(&iucv->msg_sent); | |
1156 | goto fail; | |
1157 | } | |
1158 | goto release; | |
1159 | } | |
bb664f49 | 1160 | skb_queue_tail(&iucv->send_skb_q, skb); |
b8942e3b | 1161 | |
bb664f49 HB |
1162 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) |
1163 | && skb->len <= 7) { | |
1164 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
b8942e3b | 1165 | |
bb664f49 HB |
1166 | /* on success: there is no message_complete callback |
1167 | * for an IPRMDATA msg; remove skb from send queue */ | |
1168 | if (err == 0) { | |
1169 | skb_unlink(skb, &iucv->send_skb_q); | |
1170 | kfree_skb(skb); | |
1171 | } | |
1172 | ||
1173 | /* this error should never happen since the | |
1174 | * IUCV_IPRMDATA path flag is set... sever path */ | |
1175 | if (err == 0x15) { | |
6fcd61f7 | 1176 | pr_iucv->path_sever(iucv->path, NULL); |
eac3731b JH |
1177 | skb_unlink(skb, &iucv->send_skb_q); |
1178 | err = -EPIPE; | |
1179 | goto fail; | |
1180 | } | |
bb664f49 | 1181 | } else |
6fcd61f7 | 1182 | err = pr_iucv->message_send(iucv->path, &txmsg, 0, 0, |
bb664f49 HB |
1183 | (void *) skb->data, skb->len); |
1184 | if (err) { | |
1185 | if (err == 3) { | |
1186 | user_id[8] = 0; | |
1187 | memcpy(user_id, iucv->dst_user_id, 8); | |
1188 | appl_id[8] = 0; | |
1189 | memcpy(appl_id, iucv->dst_name, 8); | |
1190 | pr_err("Application %s on z/VM guest %s" | |
1191 | " exceeds message limit\n", | |
1192 | appl_id, user_id); | |
0ea920d2 HB |
1193 | err = -EAGAIN; |
1194 | } else | |
1195 | err = -EPIPE; | |
bb664f49 | 1196 | skb_unlink(skb, &iucv->send_skb_q); |
bb664f49 | 1197 | goto fail; |
eac3731b JH |
1198 | } |
1199 | ||
3881ac44 | 1200 | release: |
eac3731b JH |
1201 | release_sock(sk); |
1202 | return len; | |
1203 | ||
1204 | fail: | |
816abbad UB |
1205 | if (skb->dev) |
1206 | dev_put(skb->dev); | |
eac3731b JH |
1207 | kfree_skb(skb); |
1208 | out: | |
1209 | release_sock(sk); | |
1210 | return err; | |
1211 | } | |
1212 | ||
bf95d20f HB |
1213 | /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's |
1214 | * | |
1215 | * Locking: must be called with message_q.lock held | |
1216 | */ | |
f0703c80 UB |
1217 | static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len) |
1218 | { | |
1219 | int dataleft, size, copied = 0; | |
1220 | struct sk_buff *nskb; | |
1221 | ||
1222 | dataleft = len; | |
1223 | while (dataleft) { | |
1224 | if (dataleft >= sk->sk_rcvbuf / 4) | |
1225 | size = sk->sk_rcvbuf / 4; | |
1226 | else | |
1227 | size = dataleft; | |
1228 | ||
1229 | nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA); | |
1230 | if (!nskb) | |
1231 | return -ENOMEM; | |
1232 | ||
44b1e6b5 HB |
1233 | /* copy target class to control buffer of new skb */ |
1234 | memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN); | |
1235 | ||
1236 | /* copy data fragment */ | |
f0703c80 UB |
1237 | memcpy(nskb->data, skb->data + copied, size); |
1238 | copied += size; | |
1239 | dataleft -= size; | |
1240 | ||
1241 | skb_reset_transport_header(nskb); | |
1242 | skb_reset_network_header(nskb); | |
1243 | nskb->len = size; | |
1244 | ||
1245 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb); | |
1246 | } | |
1247 | ||
1248 | return 0; | |
1249 | } | |
1250 | ||
bf95d20f HB |
1251 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1252 | * | |
1253 | * Locking: must be called with message_q.lock held | |
1254 | */ | |
f0703c80 UB |
1255 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1256 | struct iucv_path *path, | |
1257 | struct iucv_message *msg) | |
1258 | { | |
1259 | int rc; | |
b8942e3b HB |
1260 | unsigned int len; |
1261 | ||
1262 | len = iucv_msg_length(msg); | |
f0703c80 | 1263 | |
44b1e6b5 HB |
1264 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1265 | /* Note: the first 4 bytes are reserved for msg tag */ | |
1266 | memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN); | |
1267 | ||
b8942e3b HB |
1268 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1269 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1270 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1271 | skb->data = NULL; | |
1272 | skb->len = 0; | |
1273 | } | |
f0703c80 | 1274 | } else { |
6fcd61f7 FB |
1275 | rc = pr_iucv->message_receive(path, msg, |
1276 | msg->flags & IUCV_IPRMDATA, | |
1277 | skb->data, len, NULL); | |
f0703c80 UB |
1278 | if (rc) { |
1279 | kfree_skb(skb); | |
1280 | return; | |
1281 | } | |
aa8e71f5 HB |
1282 | /* we need to fragment iucv messages for SOCK_STREAM only; |
1283 | * for SOCK_SEQPACKET, it is only relevant if we support | |
1284 | * record segmentation using MSG_EOR (see also recvmsg()) */ | |
1285 | if (sk->sk_type == SOCK_STREAM && | |
1286 | skb->truesize >= sk->sk_rcvbuf / 4) { | |
b8942e3b | 1287 | rc = iucv_fragment_skb(sk, skb, len); |
f0703c80 UB |
1288 | kfree_skb(skb); |
1289 | skb = NULL; | |
1290 | if (rc) { | |
6fcd61f7 | 1291 | pr_iucv->path_sever(path, NULL); |
f0703c80 UB |
1292 | return; |
1293 | } | |
1294 | skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q); | |
1295 | } else { | |
1296 | skb_reset_transport_header(skb); | |
1297 | skb_reset_network_header(skb); | |
b8942e3b | 1298 | skb->len = len; |
f0703c80 UB |
1299 | } |
1300 | } | |
1301 | ||
1302 | if (sock_queue_rcv_skb(sk, skb)) | |
1303 | skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb); | |
1304 | } | |
1305 | ||
bf95d20f HB |
1306 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1307 | * | |
1308 | * Locking: must be called with message_q.lock held | |
1309 | */ | |
f0703c80 UB |
1310 | static void iucv_process_message_q(struct sock *sk) |
1311 | { | |
1312 | struct iucv_sock *iucv = iucv_sk(sk); | |
1313 | struct sk_buff *skb; | |
1314 | struct sock_msg_q *p, *n; | |
1315 | ||
1316 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
b8942e3b | 1317 | skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1318 | if (!skb) |
1319 | break; | |
1320 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1321 | list_del(&p->list); | |
1322 | kfree(p); | |
1323 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1324 | break; | |
1325 | } | |
1326 | } | |
1327 | ||
eac3731b JH |
1328 | static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
1329 | struct msghdr *msg, size_t len, int flags) | |
1330 | { | |
1331 | int noblock = flags & MSG_DONTWAIT; | |
1332 | struct sock *sk = sock->sk; | |
561e0360 | 1333 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1334 | unsigned int copied, rlen; |
3881ac44 UB |
1335 | struct sk_buff *skb, *rskb, *cskb, *sskb; |
1336 | int blen; | |
eac3731b JH |
1337 | int err = 0; |
1338 | ||
aac6399c | 1339 | if ((sk->sk_state == IUCV_DISCONN) && |
f0703c80 UB |
1340 | skb_queue_empty(&iucv->backlog_skb_q) && |
1341 | skb_queue_empty(&sk->sk_receive_queue) && | |
1342 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1343 | return 0; |
1344 | ||
eac3731b JH |
1345 | if (flags & (MSG_OOB)) |
1346 | return -EOPNOTSUPP; | |
1347 | ||
60d3705f HB |
1348 | /* receive/dequeue next skb: |
1349 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1350 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1351 | if (!skb) { | |
1352 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1353 | return 0; | |
1354 | return err; | |
1355 | } | |
1356 | ||
aa8e71f5 HB |
1357 | rlen = skb->len; /* real length of skb */ |
1358 | copied = min_t(unsigned int, rlen, len); | |
eac3731b | 1359 | |
561e0360 | 1360 | cskb = skb; |
3881ac44 | 1361 | if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { |
802788bf HB |
1362 | if (!(flags & MSG_PEEK)) |
1363 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1364 | return -EFAULT; | |
eac3731b JH |
1365 | } |
1366 | ||
aa8e71f5 HB |
1367 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1368 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1369 | if (copied < rlen) | |
1370 | msg->msg_flags |= MSG_TRUNC; | |
1371 | /* each iucv message contains a complete record */ | |
1372 | msg->msg_flags |= MSG_EOR; | |
1373 | } | |
eac3731b | 1374 | |
44b1e6b5 HB |
1375 | /* create control message to store iucv msg target class: |
1376 | * get the trgcls from the control buffer of the skb due to | |
1377 | * fragmentation of original iucv message. */ | |
1378 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
1379 | CB_TRGCLS_LEN, CB_TRGCLS(skb)); | |
1380 | if (err) { | |
1381 | if (!(flags & MSG_PEEK)) | |
1382 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1383 | return err; | |
1384 | } | |
1385 | ||
eac3731b JH |
1386 | /* Mark read part of skb as used */ |
1387 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1388 | |
aa8e71f5 HB |
1389 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1390 | if (sk->sk_type == SOCK_STREAM) { | |
1391 | skb_pull(skb, copied); | |
1392 | if (skb->len) { | |
1393 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1394 | goto done; | |
1395 | } | |
eac3731b JH |
1396 | } |
1397 | ||
1398 | kfree_skb(skb); | |
3881ac44 | 1399 | atomic_inc(&iucv->msg_recv); |
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) { |
561e0360 | 1405 | if (sock_queue_rcv_skb(sk, rskb)) { |
f0703c80 | 1406 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1407 | rskb); |
1408 | break; | |
1409 | } else { | |
f0703c80 | 1410 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 JH |
1411 | } |
1412 | } | |
f0703c80 | 1413 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1414 | if (!list_empty(&iucv->message_q.list)) |
1415 | iucv_process_message_q(sk); | |
3881ac44 UB |
1416 | if (atomic_read(&iucv->msg_recv) >= |
1417 | iucv->msglimit / 2) { | |
1418 | /* send WIN to peer */ | |
1419 | blen = sizeof(struct af_iucv_trans_hdr) + | |
1420 | ETH_HLEN; | |
1421 | sskb = sock_alloc_send_skb(sk, blen, 1, &err); | |
1422 | if (sskb) { | |
816abbad | 1423 | skb_reserve(sskb, blen); |
3881ac44 UB |
1424 | err = afiucv_hs_send(NULL, sk, sskb, |
1425 | AF_IUCV_FLAG_WIN); | |
1426 | } | |
1427 | if (err) { | |
1428 | sk->sk_state = IUCV_DISCONN; | |
1429 | sk->sk_state_change(sk); | |
1430 | } | |
1431 | } | |
f0703c80 | 1432 | } |
bf95d20f | 1433 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1434 | } |
eac3731b JH |
1435 | |
1436 | done: | |
aa8e71f5 HB |
1437 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1438 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1439 | copied = rlen; | |
1440 | ||
1441 | return copied; | |
eac3731b JH |
1442 | } |
1443 | ||
1444 | static inline unsigned int iucv_accept_poll(struct sock *parent) | |
1445 | { | |
1446 | struct iucv_sock *isk, *n; | |
1447 | struct sock *sk; | |
1448 | ||
da99f056 | 1449 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1450 | sk = (struct sock *) isk; |
1451 | ||
1452 | if (sk->sk_state == IUCV_CONNECTED) | |
1453 | return POLLIN | POLLRDNORM; | |
1454 | } | |
1455 | ||
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | unsigned int iucv_sock_poll(struct file *file, struct socket *sock, | |
1460 | poll_table *wait) | |
1461 | { | |
1462 | struct sock *sk = sock->sk; | |
1463 | unsigned int mask = 0; | |
1464 | ||
aa395145 | 1465 | sock_poll_wait(file, sk_sleep(sk), wait); |
eac3731b JH |
1466 | |
1467 | if (sk->sk_state == IUCV_LISTEN) | |
1468 | return iucv_accept_poll(sk); | |
1469 | ||
1470 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
1471 | mask |= POLLERR; | |
1472 | ||
1473 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1474 | mask |= POLLRDHUP; | |
1475 | ||
1476 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1477 | mask |= POLLHUP; | |
1478 | ||
1479 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1480 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
eac3731b JH |
1481 | mask |= POLLIN | POLLRDNORM; |
1482 | ||
1483 | if (sk->sk_state == IUCV_CLOSED) | |
1484 | mask |= POLLHUP; | |
1485 | ||
aac6399c | 1486 | if (sk->sk_state == IUCV_DISCONN) |
561e0360 JH |
1487 | mask |= POLLIN; |
1488 | ||
eac3731b JH |
1489 | if (sock_writeable(sk)) |
1490 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1491 | else | |
1492 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1493 | ||
1494 | return mask; | |
1495 | } | |
1496 | ||
1497 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1498 | { | |
1499 | struct sock *sk = sock->sk; | |
1500 | struct iucv_sock *iucv = iucv_sk(sk); | |
1501 | struct iucv_message txmsg; | |
1502 | int err = 0; | |
eac3731b JH |
1503 | |
1504 | how++; | |
1505 | ||
1506 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1507 | return -EINVAL; | |
1508 | ||
1509 | lock_sock(sk); | |
da99f056 | 1510 | switch (sk->sk_state) { |
e14ad5fa HB |
1511 | case IUCV_DISCONN: |
1512 | case IUCV_CLOSING: | |
eac3731b JH |
1513 | case IUCV_CLOSED: |
1514 | err = -ENOTCONN; | |
1515 | goto fail; | |
1516 | ||
1517 | default: | |
1518 | sk->sk_shutdown |= how; | |
1519 | break; | |
1520 | } | |
1521 | ||
1522 | if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { | |
1523 | txmsg.class = 0; | |
1524 | txmsg.tag = 0; | |
6fcd61f7 FB |
1525 | err = pr_iucv->message_send(iucv->path, &txmsg, IUCV_IPRMDATA, |
1526 | 0, (void *) iprm_shutdown, 8); | |
eac3731b | 1527 | if (err) { |
da99f056 | 1528 | switch (err) { |
eac3731b JH |
1529 | case 1: |
1530 | err = -ENOTCONN; | |
1531 | break; | |
1532 | case 2: | |
1533 | err = -ECONNRESET; | |
1534 | break; | |
1535 | default: | |
1536 | err = -ENOTCONN; | |
1537 | break; | |
1538 | } | |
1539 | } | |
1540 | } | |
1541 | ||
1542 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { | |
6fcd61f7 | 1543 | err = pr_iucv->path_quiesce(iucv->path, NULL); |
eac3731b JH |
1544 | if (err) |
1545 | err = -ENOTCONN; | |
1546 | ||
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 | ||
1568 | /* Unregister with IUCV base support */ | |
1569 | if (iucv_sk(sk)->path) { | |
6fcd61f7 | 1570 | pr_iucv->path_sever(iucv_sk(sk)->path, NULL); |
eac3731b JH |
1571 | iucv_path_free(iucv_sk(sk)->path); |
1572 | iucv_sk(sk)->path = NULL; | |
1573 | } | |
1574 | ||
eac3731b JH |
1575 | sock_orphan(sk); |
1576 | iucv_sock_kill(sk); | |
1577 | return err; | |
1578 | } | |
1579 | ||
9d5c5d8f HB |
1580 | /* getsockopt and setsockopt */ |
1581 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1582 | char __user *optval, unsigned int optlen) |
9d5c5d8f HB |
1583 | { |
1584 | struct sock *sk = sock->sk; | |
1585 | struct iucv_sock *iucv = iucv_sk(sk); | |
1586 | int val; | |
1587 | int rc; | |
1588 | ||
1589 | if (level != SOL_IUCV) | |
1590 | return -ENOPROTOOPT; | |
1591 | ||
1592 | if (optlen < sizeof(int)) | |
1593 | return -EINVAL; | |
1594 | ||
1595 | if (get_user(val, (int __user *) optval)) | |
1596 | return -EFAULT; | |
1597 | ||
1598 | rc = 0; | |
1599 | ||
1600 | lock_sock(sk); | |
1601 | switch (optname) { | |
1602 | case SO_IPRMDATA_MSG: | |
1603 | if (val) | |
1604 | iucv->flags |= IUCV_IPRMDATA; | |
1605 | else | |
1606 | iucv->flags &= ~IUCV_IPRMDATA; | |
1607 | break; | |
09488e2e HB |
1608 | case SO_MSGLIMIT: |
1609 | switch (sk->sk_state) { | |
1610 | case IUCV_OPEN: | |
1611 | case IUCV_BOUND: | |
1612 | if (val < 1 || val > (u16)(~0)) | |
1613 | rc = -EINVAL; | |
1614 | else | |
1615 | iucv->msglimit = val; | |
1616 | break; | |
1617 | default: | |
1618 | rc = -EINVAL; | |
1619 | break; | |
1620 | } | |
1621 | break; | |
9d5c5d8f HB |
1622 | default: |
1623 | rc = -ENOPROTOOPT; | |
1624 | break; | |
1625 | } | |
1626 | release_sock(sk); | |
1627 | ||
1628 | return rc; | |
1629 | } | |
1630 | ||
1631 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1632 | char __user *optval, int __user *optlen) | |
1633 | { | |
1634 | struct sock *sk = sock->sk; | |
1635 | struct iucv_sock *iucv = iucv_sk(sk); | |
1636 | int val, len; | |
1637 | ||
1638 | if (level != SOL_IUCV) | |
1639 | return -ENOPROTOOPT; | |
1640 | ||
1641 | if (get_user(len, optlen)) | |
1642 | return -EFAULT; | |
1643 | ||
1644 | if (len < 0) | |
1645 | return -EINVAL; | |
1646 | ||
1647 | len = min_t(unsigned int, len, sizeof(int)); | |
1648 | ||
1649 | switch (optname) { | |
1650 | case SO_IPRMDATA_MSG: | |
1651 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1652 | break; | |
09488e2e HB |
1653 | case SO_MSGLIMIT: |
1654 | lock_sock(sk); | |
1655 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1656 | : iucv->msglimit; /* default */ | |
1657 | release_sock(sk); | |
1658 | break; | |
9d5c5d8f HB |
1659 | default: |
1660 | return -ENOPROTOOPT; | |
1661 | } | |
1662 | ||
1663 | if (put_user(len, optlen)) | |
1664 | return -EFAULT; | |
1665 | if (copy_to_user(optval, &val, len)) | |
1666 | return -EFAULT; | |
1667 | ||
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | ||
eac3731b JH |
1672 | /* Callback wrappers - called from iucv base support */ |
1673 | static int iucv_callback_connreq(struct iucv_path *path, | |
1674 | u8 ipvmid[8], u8 ipuser[16]) | |
1675 | { | |
1676 | unsigned char user_data[16]; | |
1677 | unsigned char nuser_data[16]; | |
1678 | unsigned char src_name[8]; | |
1679 | struct hlist_node *node; | |
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; |
eac3731b JH |
1690 | sk_for_each(sk, node, &iucv_sk_list.head) |
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 */ | |
aa8e71f5 | 1725 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); |
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) { |
6fcd61f7 | 1753 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 HB |
1754 | iucv_path_free(path); |
1755 | iucv_sock_kill(nsk); | |
eac3731b JH |
1756 | goto fail; |
1757 | } | |
1758 | ||
1759 | iucv_accept_enqueue(sk, nsk); | |
1760 | ||
1761 | /* Wake up accept */ | |
1762 | nsk->sk_state = IUCV_CONNECTED; | |
1763 | sk->sk_data_ready(sk, 1); | |
1764 | err = 0; | |
1765 | fail: | |
1766 | bh_unlock_sock(sk); | |
1767 | return 0; | |
1768 | } | |
1769 | ||
1770 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1771 | { | |
1772 | struct sock *sk = path->private; | |
1773 | ||
1774 | sk->sk_state = IUCV_CONNECTED; | |
1775 | sk->sk_state_change(sk); | |
1776 | } | |
1777 | ||
1778 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1779 | { | |
1780 | struct sock *sk = path->private; | |
561e0360 | 1781 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1782 | struct sk_buff *skb; |
1783 | struct sock_msg_q *save_msg; | |
1784 | int len; | |
561e0360 | 1785 | |
fe86e54e | 1786 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
6fcd61f7 | 1787 | pr_iucv->message_reject(path, msg); |
eac3731b | 1788 | return; |
fe86e54e | 1789 | } |
eac3731b | 1790 | |
3fa6b5ad | 1791 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1792 | |
f0703c80 UB |
1793 | if (!list_empty(&iucv->message_q.list) || |
1794 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1795 | goto save_message; | |
1796 | ||
1797 | len = atomic_read(&sk->sk_rmem_alloc); | |
87fb4b7b | 1798 | len += SKB_TRUESIZE(iucv_msg_length(msg)); |
f0703c80 UB |
1799 | if (len > sk->sk_rcvbuf) |
1800 | goto save_message; | |
1801 | ||
b8942e3b | 1802 | skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA); |
f0703c80 UB |
1803 | if (!skb) |
1804 | goto save_message; | |
eac3731b | 1805 | |
f0703c80 | 1806 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1807 | goto out_unlock; |
eac3731b | 1808 | |
f0703c80 UB |
1809 | save_message: |
1810 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1811 | if (!save_msg) |
a56635a5 | 1812 | goto out_unlock; |
f0703c80 UB |
1813 | save_msg->path = path; |
1814 | save_msg->msg = *msg; | |
eac3731b | 1815 | |
f0703c80 | 1816 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1817 | |
1818 | out_unlock: | |
f0703c80 | 1819 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1820 | } |
1821 | ||
1822 | static void iucv_callback_txdone(struct iucv_path *path, | |
1823 | struct iucv_message *msg) | |
1824 | { | |
1825 | struct sock *sk = path->private; | |
f2a77991 | 1826 | struct sk_buff *this = NULL; |
eac3731b JH |
1827 | struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; |
1828 | struct sk_buff *list_skb = list->next; | |
1829 | unsigned long flags; | |
1830 | ||
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) { |
44b1e6b5 | 1835 | if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) { |
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 | } |
c2b4afd2 | 1852 | BUG_ON(!this); |
eac3731b | 1853 | |
da99f056 | 1854 | if (sk->sk_state == IUCV_CLOSING) { |
561e0360 JH |
1855 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { |
1856 | sk->sk_state = IUCV_CLOSED; | |
1857 | sk->sk_state_change(sk); | |
1858 | } | |
1859 | } | |
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 | ||
aac6399c | 1867 | sk->sk_state = IUCV_DISCONN; |
eac3731b JH |
1868 | |
1869 | sk->sk_state_change(sk); | |
1870 | } | |
1871 | ||
af88b52d HB |
1872 | /* called if the other communication side shuts down its RECV direction; |
1873 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1874 | */ | |
1875 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1876 | { | |
1877 | struct sock *sk = path->private; | |
1878 | ||
1879 | bh_lock_sock(sk); | |
1880 | if (sk->sk_state != IUCV_CLOSED) { | |
1881 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1882 | sk->sk_state_change(sk); | |
1883 | } | |
1884 | bh_unlock_sock(sk); | |
1885 | } | |
1886 | ||
3881ac44 UB |
1887 | /***************** HiperSockets transport callbacks ********************/ |
1888 | static void afiucv_swap_src_dest(struct sk_buff *skb) | |
1889 | { | |
1890 | struct af_iucv_trans_hdr *trans_hdr = | |
1891 | (struct af_iucv_trans_hdr *)skb->data; | |
1892 | char tmpID[8]; | |
1893 | char tmpName[8]; | |
1894 | ||
1895 | ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
1896 | ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
1897 | ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
1898 | ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
1899 | memcpy(tmpID, trans_hdr->srcUserID, 8); | |
1900 | memcpy(tmpName, trans_hdr->srcAppName, 8); | |
1901 | memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); | |
1902 | memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); | |
1903 | memcpy(trans_hdr->destUserID, tmpID, 8); | |
1904 | memcpy(trans_hdr->destAppName, tmpName, 8); | |
1905 | skb_push(skb, ETH_HLEN); | |
1906 | memset(skb->data, 0, ETH_HLEN); | |
1907 | } | |
1908 | ||
1909 | /** | |
1910 | * afiucv_hs_callback_syn - react on received SYN | |
1911 | **/ | |
1912 | static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) | |
1913 | { | |
1914 | struct sock *nsk; | |
1915 | struct iucv_sock *iucv, *niucv; | |
1916 | struct af_iucv_trans_hdr *trans_hdr; | |
1917 | int err; | |
1918 | ||
1919 | iucv = iucv_sk(sk); | |
1920 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
1921 | if (!iucv) { | |
1922 | /* no sock - connection refused */ | |
1923 | afiucv_swap_src_dest(skb); | |
1924 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1925 | err = dev_queue_xmit(skb); | |
1926 | goto out; | |
1927 | } | |
1928 | ||
1929 | nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); | |
1930 | bh_lock_sock(sk); | |
1931 | if ((sk->sk_state != IUCV_LISTEN) || | |
1932 | sk_acceptq_is_full(sk) || | |
1933 | !nsk) { | |
1934 | /* error on server socket - connection refused */ | |
1935 | if (nsk) | |
1936 | sk_free(nsk); | |
1937 | afiucv_swap_src_dest(skb); | |
1938 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1939 | err = dev_queue_xmit(skb); | |
1940 | bh_unlock_sock(sk); | |
1941 | goto out; | |
1942 | } | |
1943 | ||
1944 | niucv = iucv_sk(nsk); | |
1945 | iucv_sock_init(nsk, sk); | |
1946 | niucv->transport = AF_IUCV_TRANS_HIPER; | |
1947 | niucv->msglimit = iucv->msglimit; | |
1948 | if (!trans_hdr->window) | |
1949 | niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; | |
1950 | else | |
1951 | niucv->msglimit_peer = trans_hdr->window; | |
1952 | memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); | |
1953 | memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); | |
1954 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1955 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1956 | nsk->sk_bound_dev_if = sk->sk_bound_dev_if; | |
1957 | afiucv_swap_src_dest(skb); | |
1958 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; | |
1959 | trans_hdr->window = niucv->msglimit; | |
1960 | /* if receiver acks the xmit connection is established */ | |
1961 | err = dev_queue_xmit(skb); | |
1962 | if (!err) { | |
1963 | iucv_accept_enqueue(sk, nsk); | |
1964 | nsk->sk_state = IUCV_CONNECTED; | |
1965 | sk->sk_data_ready(sk, 1); | |
1966 | } else | |
1967 | iucv_sock_kill(nsk); | |
1968 | bh_unlock_sock(sk); | |
1969 | ||
1970 | out: | |
1971 | return NET_RX_SUCCESS; | |
1972 | } | |
1973 | ||
1974 | /** | |
1975 | * afiucv_hs_callback_synack() - react on received SYN-ACK | |
1976 | **/ | |
1977 | static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) | |
1978 | { | |
1979 | struct iucv_sock *iucv = iucv_sk(sk); | |
1980 | struct af_iucv_trans_hdr *trans_hdr = | |
1981 | (struct af_iucv_trans_hdr *)skb->data; | |
1982 | ||
1983 | if (!iucv) | |
1984 | goto out; | |
1985 | if (sk->sk_state != IUCV_BOUND) | |
1986 | goto out; | |
1987 | bh_lock_sock(sk); | |
1988 | iucv->msglimit_peer = trans_hdr->window; | |
1989 | sk->sk_state = IUCV_CONNECTED; | |
1990 | sk->sk_state_change(sk); | |
1991 | bh_unlock_sock(sk); | |
1992 | out: | |
1993 | kfree_skb(skb); | |
1994 | return NET_RX_SUCCESS; | |
1995 | } | |
1996 | ||
1997 | /** | |
1998 | * afiucv_hs_callback_synfin() - react on received SYN_FIN | |
1999 | **/ | |
2000 | static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) | |
2001 | { | |
2002 | struct iucv_sock *iucv = iucv_sk(sk); | |
2003 | ||
2004 | if (!iucv) | |
2005 | goto out; | |
2006 | if (sk->sk_state != IUCV_BOUND) | |
2007 | goto out; | |
2008 | bh_lock_sock(sk); | |
2009 | sk->sk_state = IUCV_DISCONN; | |
2010 | sk->sk_state_change(sk); | |
2011 | bh_unlock_sock(sk); | |
2012 | out: | |
2013 | kfree_skb(skb); | |
2014 | return NET_RX_SUCCESS; | |
2015 | } | |
2016 | ||
2017 | /** | |
2018 | * afiucv_hs_callback_fin() - react on received FIN | |
2019 | **/ | |
2020 | static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) | |
2021 | { | |
2022 | struct iucv_sock *iucv = iucv_sk(sk); | |
2023 | ||
2024 | /* other end of connection closed */ | |
2025 | if (iucv) { | |
2026 | bh_lock_sock(sk); | |
aac6399c | 2027 | sk->sk_state = IUCV_DISCONN; |
3881ac44 UB |
2028 | sk->sk_state_change(sk); |
2029 | bh_unlock_sock(sk); | |
2030 | } | |
2031 | kfree_skb(skb); | |
2032 | return NET_RX_SUCCESS; | |
2033 | } | |
2034 | ||
2035 | /** | |
2036 | * afiucv_hs_callback_win() - react on received WIN | |
2037 | **/ | |
2038 | static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) | |
2039 | { | |
2040 | struct iucv_sock *iucv = iucv_sk(sk); | |
2041 | struct af_iucv_trans_hdr *trans_hdr = | |
2042 | (struct af_iucv_trans_hdr *)skb->data; | |
2043 | ||
2044 | if (!iucv) | |
2045 | return NET_RX_SUCCESS; | |
2046 | ||
2047 | if (sk->sk_state != IUCV_CONNECTED) | |
2048 | return NET_RX_SUCCESS; | |
2049 | ||
2050 | atomic_sub(trans_hdr->window, &iucv->msg_sent); | |
2051 | iucv_sock_wake_msglim(sk); | |
2052 | return NET_RX_SUCCESS; | |
2053 | } | |
2054 | ||
2055 | /** | |
2056 | * afiucv_hs_callback_rx() - react on received data | |
2057 | **/ | |
2058 | static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) | |
2059 | { | |
2060 | struct iucv_sock *iucv = iucv_sk(sk); | |
2061 | ||
2062 | if (!iucv) { | |
2063 | kfree_skb(skb); | |
2064 | return NET_RX_SUCCESS; | |
2065 | } | |
2066 | ||
2067 | if (sk->sk_state != IUCV_CONNECTED) { | |
2068 | kfree_skb(skb); | |
2069 | return NET_RX_SUCCESS; | |
2070 | } | |
2071 | ||
2072 | /* write stuff from iucv_msg to skb cb */ | |
2073 | if (skb->len <= sizeof(struct af_iucv_trans_hdr)) { | |
2074 | kfree_skb(skb); | |
2075 | return NET_RX_SUCCESS; | |
2076 | } | |
2077 | skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); | |
2078 | skb_reset_transport_header(skb); | |
2079 | skb_reset_network_header(skb); | |
2080 | spin_lock(&iucv->message_q.lock); | |
2081 | if (skb_queue_empty(&iucv->backlog_skb_q)) { | |
2082 | if (sock_queue_rcv_skb(sk, skb)) { | |
2083 | /* handle rcv queue full */ | |
2084 | skb_queue_tail(&iucv->backlog_skb_q, skb); | |
2085 | } | |
2086 | } else | |
2087 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
2088 | spin_unlock(&iucv->message_q.lock); | |
2089 | return NET_RX_SUCCESS; | |
2090 | } | |
2091 | ||
2092 | /** | |
2093 | * afiucv_hs_rcv() - base function for arriving data through HiperSockets | |
2094 | * transport | |
2095 | * called from netif RX softirq | |
2096 | **/ | |
2097 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, | |
2098 | struct packet_type *pt, struct net_device *orig_dev) | |
2099 | { | |
2100 | struct hlist_node *node; | |
2101 | struct sock *sk; | |
2102 | struct iucv_sock *iucv; | |
2103 | struct af_iucv_trans_hdr *trans_hdr; | |
2104 | char nullstring[8]; | |
2105 | int err = 0; | |
2106 | ||
2107 | skb_pull(skb, ETH_HLEN); | |
2108 | trans_hdr = (struct af_iucv_trans_hdr *)skb->data; | |
2109 | EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
2110 | EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
2111 | EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
2112 | EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
2113 | memset(nullstring, 0, sizeof(nullstring)); | |
2114 | iucv = NULL; | |
2115 | sk = NULL; | |
2116 | read_lock(&iucv_sk_list.lock); | |
2117 | sk_for_each(sk, node, &iucv_sk_list.head) { | |
2118 | if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { | |
2119 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2120 | trans_hdr->destAppName, 8)) && | |
2121 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2122 | trans_hdr->destUserID, 8)) && | |
2123 | (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && | |
2124 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2125 | nullstring, 8))) { | |
2126 | iucv = iucv_sk(sk); | |
2127 | break; | |
2128 | } | |
2129 | } else { | |
2130 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2131 | trans_hdr->destAppName, 8)) && | |
2132 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2133 | trans_hdr->destUserID, 8)) && | |
2134 | (!memcmp(&iucv_sk(sk)->dst_name, | |
2135 | trans_hdr->srcAppName, 8)) && | |
2136 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2137 | trans_hdr->srcUserID, 8))) { | |
2138 | iucv = iucv_sk(sk); | |
2139 | break; | |
2140 | } | |
2141 | } | |
2142 | } | |
2143 | read_unlock(&iucv_sk_list.lock); | |
2144 | if (!iucv) | |
2145 | sk = NULL; | |
2146 | ||
2147 | /* no sock | |
2148 | how should we send with no sock | |
2149 | 1) send without sock no send rc checking? | |
2150 | 2) introduce default sock to handle this cases | |
2151 | ||
2152 | SYN -> send SYN|ACK in good case, send SYN|FIN in bad case | |
2153 | data -> send FIN | |
2154 | SYN|ACK, SYN|FIN, FIN -> no action? */ | |
2155 | ||
2156 | switch (trans_hdr->flags) { | |
2157 | case AF_IUCV_FLAG_SYN: | |
2158 | /* connect request */ | |
2159 | err = afiucv_hs_callback_syn(sk, skb); | |
2160 | break; | |
2161 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): | |
2162 | /* connect request confirmed */ | |
2163 | err = afiucv_hs_callback_synack(sk, skb); | |
2164 | break; | |
2165 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): | |
2166 | /* connect request refused */ | |
2167 | err = afiucv_hs_callback_synfin(sk, skb); | |
2168 | break; | |
2169 | case (AF_IUCV_FLAG_FIN): | |
2170 | /* close request */ | |
2171 | err = afiucv_hs_callback_fin(sk, skb); | |
2172 | break; | |
2173 | case (AF_IUCV_FLAG_WIN): | |
2174 | err = afiucv_hs_callback_win(sk, skb); | |
2175 | if (skb->len > sizeof(struct af_iucv_trans_hdr)) | |
2176 | err = afiucv_hs_callback_rx(sk, skb); | |
2177 | else | |
2178 | kfree(skb); | |
2179 | break; | |
2180 | case 0: | |
2181 | /* plain data frame */ | |
c64d3f8f UB |
2182 | memcpy(CB_TRGCLS(skb), &trans_hdr->iucv_hdr.class, |
2183 | CB_TRGCLS_LEN); | |
3881ac44 UB |
2184 | err = afiucv_hs_callback_rx(sk, skb); |
2185 | break; | |
2186 | default: | |
2187 | ; | |
2188 | } | |
2189 | ||
2190 | return err; | |
2191 | } | |
2192 | ||
2193 | /** | |
2194 | * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets | |
2195 | * transport | |
2196 | **/ | |
2197 | static void afiucv_hs_callback_txnotify(struct sk_buff *skb, | |
2198 | enum iucv_tx_notify n) | |
2199 | { | |
2200 | struct sock *isk = skb->sk; | |
2201 | struct sock *sk = NULL; | |
2202 | struct iucv_sock *iucv = NULL; | |
2203 | struct sk_buff_head *list; | |
2204 | struct sk_buff *list_skb; | |
2205 | struct sk_buff *this = NULL; | |
2206 | unsigned long flags; | |
2207 | struct hlist_node *node; | |
2208 | ||
2209 | read_lock(&iucv_sk_list.lock); | |
2210 | sk_for_each(sk, node, &iucv_sk_list.head) | |
2211 | if (sk == isk) { | |
2212 | iucv = iucv_sk(sk); | |
2213 | break; | |
2214 | } | |
2215 | read_unlock(&iucv_sk_list.lock); | |
2216 | ||
2217 | if (!iucv) | |
2218 | return; | |
2219 | ||
2220 | bh_lock_sock(sk); | |
2221 | list = &iucv->send_skb_q; | |
2222 | list_skb = list->next; | |
2223 | if (skb_queue_empty(list)) | |
2224 | goto out_unlock; | |
2225 | ||
2226 | spin_lock_irqsave(&list->lock, flags); | |
2227 | while (list_skb != (struct sk_buff *)list) { | |
2228 | if (skb_shinfo(list_skb) == skb_shinfo(skb)) { | |
2229 | this = list_skb; | |
2230 | switch (n) { | |
2231 | case TX_NOTIFY_OK: | |
2232 | __skb_unlink(this, list); | |
2233 | iucv_sock_wake_msglim(sk); | |
816abbad | 2234 | dev_put(this->dev); |
3881ac44 UB |
2235 | kfree_skb(this); |
2236 | break; | |
2237 | case TX_NOTIFY_PENDING: | |
2238 | atomic_inc(&iucv->pendings); | |
2239 | break; | |
2240 | case TX_NOTIFY_DELAYED_OK: | |
2241 | __skb_unlink(this, list); | |
2242 | atomic_dec(&iucv->pendings); | |
2243 | if (atomic_read(&iucv->pendings) <= 0) | |
2244 | iucv_sock_wake_msglim(sk); | |
816abbad | 2245 | dev_put(this->dev); |
3881ac44 UB |
2246 | kfree_skb(this); |
2247 | break; | |
2248 | case TX_NOTIFY_UNREACHABLE: | |
2249 | case TX_NOTIFY_DELAYED_UNREACHABLE: | |
2250 | case TX_NOTIFY_TPQFULL: /* not yet used */ | |
2251 | case TX_NOTIFY_GENERALERROR: | |
2252 | case TX_NOTIFY_DELAYED_GENERALERROR: | |
2253 | __skb_unlink(this, list); | |
816abbad | 2254 | dev_put(this->dev); |
3881ac44 | 2255 | kfree_skb(this); |
aac6399c | 2256 | sk->sk_state = IUCV_DISCONN; |
3881ac44 UB |
2257 | sk->sk_state_change(sk); |
2258 | break; | |
2259 | } | |
2260 | break; | |
2261 | } | |
2262 | list_skb = list_skb->next; | |
2263 | } | |
2264 | spin_unlock_irqrestore(&list->lock, flags); | |
2265 | ||
42bd48e0 UB |
2266 | if (sk->sk_state == IUCV_CLOSING) { |
2267 | if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { | |
2268 | sk->sk_state = IUCV_CLOSED; | |
2269 | sk->sk_state_change(sk); | |
2270 | } | |
2271 | } | |
2272 | ||
3881ac44 UB |
2273 | out_unlock: |
2274 | bh_unlock_sock(sk); | |
2275 | } | |
5708e868 | 2276 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
2277 | .family = PF_IUCV, |
2278 | .owner = THIS_MODULE, | |
2279 | .release = iucv_sock_release, | |
2280 | .bind = iucv_sock_bind, | |
2281 | .connect = iucv_sock_connect, | |
2282 | .listen = iucv_sock_listen, | |
2283 | .accept = iucv_sock_accept, | |
2284 | .getname = iucv_sock_getname, | |
2285 | .sendmsg = iucv_sock_sendmsg, | |
2286 | .recvmsg = iucv_sock_recvmsg, | |
2287 | .poll = iucv_sock_poll, | |
2288 | .ioctl = sock_no_ioctl, | |
2289 | .mmap = sock_no_mmap, | |
2290 | .socketpair = sock_no_socketpair, | |
2291 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
2292 | .setsockopt = iucv_sock_setsockopt, |
2293 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
2294 | }; |
2295 | ||
ec1b4cf7 | 2296 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
2297 | .family = AF_IUCV, |
2298 | .owner = THIS_MODULE, | |
2299 | .create = iucv_sock_create, | |
2300 | }; | |
2301 | ||
3881ac44 UB |
2302 | static struct packet_type iucv_packet_type = { |
2303 | .type = cpu_to_be16(ETH_P_AF_IUCV), | |
2304 | .func = afiucv_hs_rcv, | |
2305 | }; | |
2306 | ||
2307 | static int afiucv_iucv_init(void) | |
6fcd61f7 FB |
2308 | { |
2309 | int err; | |
2310 | ||
2311 | err = pr_iucv->iucv_register(&af_iucv_handler, 0); | |
2312 | if (err) | |
2313 | goto out; | |
2314 | /* establish dummy device */ | |
2315 | af_iucv_driver.bus = pr_iucv->bus; | |
2316 | err = driver_register(&af_iucv_driver); | |
2317 | if (err) | |
2318 | goto out_iucv; | |
2319 | af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
2320 | if (!af_iucv_dev) { | |
2321 | err = -ENOMEM; | |
2322 | goto out_driver; | |
2323 | } | |
2324 | dev_set_name(af_iucv_dev, "af_iucv"); | |
2325 | af_iucv_dev->bus = pr_iucv->bus; | |
2326 | af_iucv_dev->parent = pr_iucv->root; | |
2327 | af_iucv_dev->release = (void (*)(struct device *))kfree; | |
2328 | af_iucv_dev->driver = &af_iucv_driver; | |
2329 | err = device_register(af_iucv_dev); | |
2330 | if (err) | |
2331 | goto out_driver; | |
2332 | return 0; | |
2333 | ||
2334 | out_driver: | |
2335 | driver_unregister(&af_iucv_driver); | |
2336 | out_iucv: | |
2337 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2338 | out: | |
2339 | return err; | |
2340 | } | |
2341 | ||
da99f056 | 2342 | static int __init afiucv_init(void) |
eac3731b JH |
2343 | { |
2344 | int err; | |
2345 | ||
3881ac44 UB |
2346 | if (MACHINE_IS_VM) { |
2347 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
2348 | if (unlikely(err)) { | |
2349 | WARN_ON(err); | |
2350 | err = -EPROTONOSUPPORT; | |
2351 | goto out; | |
2352 | } | |
eac3731b | 2353 | |
3881ac44 UB |
2354 | pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); |
2355 | if (!pr_iucv) { | |
2356 | printk(KERN_WARNING "iucv_if lookup failed\n"); | |
2357 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2358 | } | |
2359 | } else { | |
2360 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2361 | pr_iucv = NULL; | |
6fcd61f7 FB |
2362 | } |
2363 | ||
eac3731b JH |
2364 | err = proto_register(&iucv_proto, 0); |
2365 | if (err) | |
6fcd61f7 | 2366 | goto out; |
eac3731b JH |
2367 | err = sock_register(&iucv_sock_family_ops); |
2368 | if (err) | |
2369 | goto out_proto; | |
6fcd61f7 | 2370 | |
3881ac44 UB |
2371 | if (pr_iucv) { |
2372 | err = afiucv_iucv_init(); | |
2373 | if (err) | |
2374 | goto out_sock; | |
2375 | } | |
2376 | dev_add_pack(&iucv_packet_type); | |
eac3731b JH |
2377 | return 0; |
2378 | ||
c23cad92 UB |
2379 | out_sock: |
2380 | sock_unregister(PF_IUCV); | |
eac3731b JH |
2381 | out_proto: |
2382 | proto_unregister(&iucv_proto); | |
eac3731b | 2383 | out: |
6fcd61f7 FB |
2384 | if (pr_iucv) |
2385 | symbol_put(iucv_if); | |
eac3731b JH |
2386 | return err; |
2387 | } | |
2388 | ||
2389 | static void __exit afiucv_exit(void) | |
2390 | { | |
3881ac44 UB |
2391 | if (pr_iucv) { |
2392 | device_unregister(af_iucv_dev); | |
2393 | driver_unregister(&af_iucv_driver); | |
2394 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); | |
2395 | symbol_put(iucv_if); | |
2396 | } | |
2397 | dev_remove_pack(&iucv_packet_type); | |
eac3731b JH |
2398 | sock_unregister(PF_IUCV); |
2399 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2400 | } |
2401 | ||
2402 | module_init(afiucv_init); | |
2403 | module_exit(afiucv_exit); | |
2404 | ||
2405 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
2406 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
2407 | MODULE_VERSION(VERSION); | |
2408 | MODULE_LICENSE("GPL"); | |
2409 | MODULE_ALIAS_NETPROTO(PF_IUCV); | |
3881ac44 | 2410 |