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Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
eac3731b | 2 | /* |
eac3731b JH |
3 | * IUCV protocol stack for Linux on zSeries |
4 | * | |
c23cad92 | 5 | * Copyright IBM Corp. 2006, 2009 |
eac3731b JH |
6 | * |
7 | * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> | |
c23cad92 UB |
8 | * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> |
9 | * PM functions: | |
10 | * Ursula Braun <ursula.braun@de.ibm.com> | |
eac3731b JH |
11 | */ |
12 | ||
8f7c502c UB |
13 | #define KMSG_COMPONENT "af_iucv" |
14 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
15 | ||
eac3731b | 16 | #include <linux/module.h> |
238965b7 | 17 | #include <linux/netdevice.h> |
eac3731b | 18 | #include <linux/types.h> |
0d1c7664 | 19 | #include <linux/limits.h> |
eac3731b JH |
20 | #include <linux/list.h> |
21 | #include <linux/errno.h> | |
22 | #include <linux/kernel.h> | |
174cd4b1 | 23 | #include <linux/sched/signal.h> |
eac3731b JH |
24 | #include <linux/slab.h> |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/poll.h> | |
02f06918 | 28 | #include <linux/security.h> |
eac3731b JH |
29 | #include <net/sock.h> |
30 | #include <asm/ebcdic.h> | |
31 | #include <asm/cpcmd.h> | |
32 | #include <linux/kmod.h> | |
33 | ||
eac3731b JH |
34 | #include <net/iucv/af_iucv.h> |
35 | ||
3881ac44 | 36 | #define VERSION "1.2" |
eac3731b JH |
37 | |
38 | static char iucv_userid[80]; | |
39 | ||
eac3731b JH |
40 | static struct proto iucv_proto = { |
41 | .name = "AF_IUCV", | |
42 | .owner = THIS_MODULE, | |
43 | .obj_size = sizeof(struct iucv_sock), | |
44 | }; | |
45 | ||
6fcd61f7 FB |
46 | static struct iucv_interface *pr_iucv; |
47 | ||
b8942e3b HB |
48 | /* special AF_IUCV IPRM messages */ |
49 | static const u8 iprm_shutdown[8] = | |
50 | {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; | |
51 | ||
c593642c | 52 | #define TRGCLS_SIZE sizeof_field(struct iucv_message, class) |
44b1e6b5 | 53 | |
0ea920d2 HB |
54 | #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
55 | do { \ | |
56 | DEFINE_WAIT(__wait); \ | |
57 | long __timeo = timeo; \ | |
58 | ret = 0; \ | |
aa395145 | 59 | prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
0ea920d2 | 60 | while (!(condition)) { \ |
0ea920d2 HB |
61 | if (!__timeo) { \ |
62 | ret = -EAGAIN; \ | |
63 | break; \ | |
64 | } \ | |
65 | if (signal_pending(current)) { \ | |
66 | ret = sock_intr_errno(__timeo); \ | |
67 | break; \ | |
68 | } \ | |
69 | release_sock(sk); \ | |
70 | __timeo = schedule_timeout(__timeo); \ | |
71 | lock_sock(sk); \ | |
72 | ret = sock_error(sk); \ | |
73 | if (ret) \ | |
74 | break; \ | |
75 | } \ | |
aa395145 | 76 | finish_wait(sk_sleep(sk), &__wait); \ |
0ea920d2 HB |
77 | } while (0) |
78 | ||
79 | #define iucv_sock_wait(sk, condition, timeo) \ | |
80 | ({ \ | |
81 | int __ret = 0; \ | |
82 | if (!(condition)) \ | |
83 | __iucv_sock_wait(sk, condition, timeo, __ret); \ | |
84 | __ret; \ | |
85 | }) | |
44b1e6b5 | 86 | |
e9a36ca5 JW |
87 | static struct sock *iucv_accept_dequeue(struct sock *parent, |
88 | struct socket *newsock); | |
57f20448 HC |
89 | static void iucv_sock_kill(struct sock *sk); |
90 | static void iucv_sock_close(struct sock *sk); | |
91 | ||
80bc97aa | 92 | static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify); |
3881ac44 | 93 | |
eac3731b JH |
94 | /* Call Back functions */ |
95 | static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); | |
96 | static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); | |
91e60eb6 UB |
97 | static void iucv_callback_connack(struct iucv_path *, u8 *); |
98 | static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *); | |
99 | static void iucv_callback_connrej(struct iucv_path *, u8 *); | |
100 | static void iucv_callback_shutdown(struct iucv_path *, u8 *); | |
eac3731b JH |
101 | |
102 | static struct iucv_sock_list iucv_sk_list = { | |
3db8ce35 | 103 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
104 | .autobind_name = ATOMIC_INIT(0) |
105 | }; | |
106 | ||
107 | static struct iucv_handler af_iucv_handler = { | |
108 | .path_pending = iucv_callback_connreq, | |
109 | .path_complete = iucv_callback_connack, | |
110 | .path_severed = iucv_callback_connrej, | |
111 | .message_pending = iucv_callback_rx, | |
af88b52d HB |
112 | .message_complete = iucv_callback_txdone, |
113 | .path_quiesced = iucv_callback_shutdown, | |
eac3731b JH |
114 | }; |
115 | ||
116 | static inline void high_nmcpy(unsigned char *dst, char *src) | |
117 | { | |
118 | memcpy(dst, src, 8); | |
119 | } | |
120 | ||
121 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
122 | { | |
123 | memcpy(&dst[8], src, 8); | |
124 | } | |
125 | ||
b8942e3b HB |
126 | /** |
127 | * iucv_msg_length() - Returns the length of an iucv message. | |
128 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
129 | * | |
130 | * The function returns the length of the specified iucv message @msg of data | |
131 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
132 | * | |
133 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
134 | * data: | |
135 | * PRMDATA[0..6] socket data (max 7 bytes); | |
136 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
137 | * | |
25985edc | 138 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
139 | * value from 0xFF. |
140 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
141 | * notifications (see iucv_sock_shutdown); and further, | |
142 | * if the socket data len is > 7, the function returns 8. | |
143 | * | |
144 | * Use this function to allocate socket buffers to store iucv message data. | |
145 | */ | |
146 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
147 | { | |
148 | size_t datalen; | |
149 | ||
150 | if (msg->flags & IUCV_IPRMDATA) { | |
151 | datalen = 0xff - msg->rmmsg[7]; | |
152 | return (datalen < 8) ? datalen : 8; | |
153 | } | |
154 | return msg->length; | |
155 | } | |
156 | ||
0ea920d2 HB |
157 | /** |
158 | * iucv_sock_in_state() - check for specific states | |
159 | * @sk: sock structure | |
160 | * @state: first iucv sk state | |
161 | * @state: second iucv sk state | |
162 | * | |
163 | * Returns true if the socket in either in the first or second state. | |
164 | */ | |
165 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
166 | { | |
167 | return (sk->sk_state == state || sk->sk_state == state2); | |
168 | } | |
169 | ||
170 | /** | |
171 | * iucv_below_msglim() - function to check if messages can be sent | |
172 | * @sk: sock structure | |
173 | * | |
174 | * Returns true if the send queue length is lower than the message limit. | |
175 | * Always returns true if the socket is not connected (no iucv path for | |
176 | * checking the message limit). | |
177 | */ | |
178 | static inline int iucv_below_msglim(struct sock *sk) | |
179 | { | |
180 | struct iucv_sock *iucv = iucv_sk(sk); | |
181 | ||
182 | if (sk->sk_state != IUCV_CONNECTED) | |
183 | return 1; | |
3881ac44 | 184 | if (iucv->transport == AF_IUCV_TRANS_IUCV) |
ef6af7bd | 185 | return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim); |
3881ac44 UB |
186 | else |
187 | return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && | |
188 | (atomic_read(&iucv->pendings) <= 0)); | |
0ea920d2 HB |
189 | } |
190 | ||
191 | /** | |
192 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
193 | */ | |
194 | static void iucv_sock_wake_msglim(struct sock *sk) | |
195 | { | |
43815482 ED |
196 | struct socket_wq *wq; |
197 | ||
198 | rcu_read_lock(); | |
199 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 200 | if (skwq_has_sleeper(wq)) |
43815482 | 201 | wake_up_interruptible_all(&wq->wait); |
0ea920d2 | 202 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 203 | rcu_read_unlock(); |
0ea920d2 HB |
204 | } |
205 | ||
3881ac44 UB |
206 | /** |
207 | * afiucv_hs_send() - send a message through HiperSockets transport | |
208 | */ | |
209 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
210 | struct sk_buff *skb, u8 flags) | |
211 | { | |
3881ac44 UB |
212 | struct iucv_sock *iucv = iucv_sk(sock); |
213 | struct af_iucv_trans_hdr *phs_hdr; | |
3881ac44 UB |
214 | int err, confirm_recv = 0; |
215 | ||
cd11d112 JW |
216 | phs_hdr = skb_push(skb, sizeof(*phs_hdr)); |
217 | memset(phs_hdr, 0, sizeof(*phs_hdr)); | |
3881ac44 | 218 | skb_reset_network_header(skb); |
3881ac44 UB |
219 | |
220 | phs_hdr->magic = ETH_P_AF_IUCV; | |
221 | phs_hdr->version = 1; | |
222 | phs_hdr->flags = flags; | |
223 | if (flags == AF_IUCV_FLAG_SYN) | |
224 | phs_hdr->window = iucv->msglimit; | |
225 | else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { | |
226 | confirm_recv = atomic_read(&iucv->msg_recv); | |
227 | phs_hdr->window = confirm_recv; | |
228 | if (confirm_recv) | |
229 | phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; | |
230 | } | |
231 | memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); | |
232 | memcpy(phs_hdr->destAppName, iucv->dst_name, 8); | |
233 | memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); | |
234 | memcpy(phs_hdr->srcAppName, iucv->src_name, 8); | |
235 | ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); | |
236 | ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); | |
237 | ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); | |
238 | ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); | |
239 | if (imsg) | |
240 | memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); | |
241 | ||
800c5eb7 | 242 | skb->dev = iucv->hs_dev; |
b2f54394 JW |
243 | if (!skb->dev) { |
244 | err = -ENODEV; | |
245 | goto err_free; | |
246 | } | |
238965b7 JW |
247 | |
248 | dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len); | |
249 | ||
b2f54394 JW |
250 | if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { |
251 | err = -ENETDOWN; | |
252 | goto err_free; | |
253 | } | |
3881ac44 | 254 | if (skb->len > skb->dev->mtu) { |
b2f54394 JW |
255 | if (sock->sk_type == SOCK_SEQPACKET) { |
256 | err = -EMSGSIZE; | |
257 | goto err_free; | |
258 | } | |
259 | skb_trim(skb, skb->dev->mtu); | |
3881ac44 | 260 | } |
2e56c26b | 261 | skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); |
238965b7 | 262 | |
ef6af7bd | 263 | atomic_inc(&iucv->skbs_in_xmit); |
3881ac44 | 264 | err = dev_queue_xmit(skb); |
800c5eb7 | 265 | if (net_xmit_eval(err)) { |
ef6af7bd | 266 | atomic_dec(&iucv->skbs_in_xmit); |
3881ac44 UB |
267 | } else { |
268 | atomic_sub(confirm_recv, &iucv->msg_recv); | |
269 | WARN_ON(atomic_read(&iucv->msg_recv) < 0); | |
270 | } | |
800c5eb7 | 271 | return net_xmit_eval(err); |
b2f54394 JW |
272 | |
273 | err_free: | |
274 | kfree_skb(skb); | |
275 | return err; | |
3881ac44 UB |
276 | } |
277 | ||
eac3731b JH |
278 | static struct sock *__iucv_get_sock_by_name(char *nm) |
279 | { | |
280 | struct sock *sk; | |
eac3731b | 281 | |
b67bfe0d | 282 | sk_for_each(sk, &iucv_sk_list.head) |
eac3731b JH |
283 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) |
284 | return sk; | |
285 | ||
286 | return NULL; | |
287 | } | |
288 | ||
289 | static void iucv_sock_destruct(struct sock *sk) | |
290 | { | |
291 | skb_queue_purge(&sk->sk_receive_queue); | |
82492a35 UB |
292 | skb_queue_purge(&sk->sk_error_queue); |
293 | ||
294 | sk_mem_reclaim(sk); | |
295 | ||
296 | if (!sock_flag(sk, SOCK_DEAD)) { | |
297 | pr_err("Attempt to release alive iucv socket %p\n", sk); | |
298 | return; | |
299 | } | |
300 | ||
301 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); | |
b2c9c5df | 302 | WARN_ON(refcount_read(&sk->sk_wmem_alloc)); |
82492a35 UB |
303 | WARN_ON(sk->sk_wmem_queued); |
304 | WARN_ON(sk->sk_forward_alloc); | |
eac3731b JH |
305 | } |
306 | ||
307 | /* Cleanup Listen */ | |
308 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
309 | { | |
310 | struct sock *sk; | |
311 | ||
312 | /* Close non-accepted connections */ | |
313 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
314 | iucv_sock_close(sk); | |
315 | iucv_sock_kill(sk); | |
316 | } | |
317 | ||
318 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
319 | } |
320 | ||
e9a36ca5 JW |
321 | static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) |
322 | { | |
323 | write_lock_bh(&l->lock); | |
324 | sk_add_node(sk, &l->head); | |
325 | write_unlock_bh(&l->lock); | |
326 | } | |
327 | ||
328 | static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
329 | { | |
330 | write_lock_bh(&l->lock); | |
331 | sk_del_node_init(sk); | |
332 | write_unlock_bh(&l->lock); | |
333 | } | |
334 | ||
7514bab0 | 335 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
336 | static void iucv_sock_kill(struct sock *sk) |
337 | { | |
338 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
339 | return; | |
340 | ||
341 | iucv_sock_unlink(&iucv_sk_list, sk); | |
342 | sock_set_flag(sk, SOCK_DEAD); | |
343 | sock_put(sk); | |
344 | } | |
345 | ||
7d316b94 UB |
346 | /* Terminate an IUCV path */ |
347 | static void iucv_sever_path(struct sock *sk, int with_user_data) | |
348 | { | |
349 | unsigned char user_data[16]; | |
350 | struct iucv_sock *iucv = iucv_sk(sk); | |
351 | struct iucv_path *path = iucv->path; | |
352 | ||
353 | if (iucv->path) { | |
354 | iucv->path = NULL; | |
355 | if (with_user_data) { | |
356 | low_nmcpy(user_data, iucv->src_name); | |
357 | high_nmcpy(user_data, iucv->dst_name); | |
358 | ASCEBC(user_data, sizeof(user_data)); | |
359 | pr_iucv->path_sever(path, user_data); | |
360 | } else | |
361 | pr_iucv->path_sever(path, NULL); | |
362 | iucv_path_free(path); | |
363 | } | |
364 | } | |
365 | ||
4e0ad322 | 366 | /* Send controlling flags through an IUCV socket for HIPER transport */ |
9fbd87d4 UB |
367 | static int iucv_send_ctrl(struct sock *sk, u8 flags) |
368 | { | |
238965b7 | 369 | struct iucv_sock *iucv = iucv_sk(sk); |
9fbd87d4 UB |
370 | int err = 0; |
371 | int blen; | |
372 | struct sk_buff *skb; | |
4e0ad322 | 373 | u8 shutdown = 0; |
9fbd87d4 | 374 | |
238965b7 JW |
375 | blen = sizeof(struct af_iucv_trans_hdr) + |
376 | LL_RESERVED_SPACE(iucv->hs_dev); | |
4e0ad322 UB |
377 | if (sk->sk_shutdown & SEND_SHUTDOWN) { |
378 | /* controlling flags should be sent anyway */ | |
379 | shutdown = sk->sk_shutdown; | |
380 | sk->sk_shutdown &= RCV_SHUTDOWN; | |
381 | } | |
9fbd87d4 UB |
382 | skb = sock_alloc_send_skb(sk, blen, 1, &err); |
383 | if (skb) { | |
384 | skb_reserve(skb, blen); | |
385 | err = afiucv_hs_send(NULL, sk, skb, flags); | |
386 | } | |
4e0ad322 UB |
387 | if (shutdown) |
388 | sk->sk_shutdown = shutdown; | |
9fbd87d4 UB |
389 | return err; |
390 | } | |
391 | ||
eac3731b JH |
392 | /* Close an IUCV socket */ |
393 | static void iucv_sock_close(struct sock *sk) | |
394 | { | |
eac3731b | 395 | struct iucv_sock *iucv = iucv_sk(sk); |
561e0360 | 396 | unsigned long timeo; |
800c5eb7 | 397 | int err = 0; |
eac3731b | 398 | |
eac3731b JH |
399 | lock_sock(sk); |
400 | ||
da99f056 | 401 | switch (sk->sk_state) { |
eac3731b JH |
402 | case IUCV_LISTEN: |
403 | iucv_sock_cleanup_listen(sk); | |
404 | break; | |
405 | ||
406 | case IUCV_CONNECTED: | |
3881ac44 | 407 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
9fbd87d4 | 408 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); |
3881ac44 UB |
409 | sk->sk_state = IUCV_DISCONN; |
410 | sk->sk_state_change(sk); | |
411 | } | |
df561f66 | 412 | fallthrough; |
05bba1ed GS |
413 | |
414 | case IUCV_DISCONN: | |
561e0360 JH |
415 | sk->sk_state = IUCV_CLOSING; |
416 | sk->sk_state_change(sk); | |
417 | ||
ef6af7bd | 418 | if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) { |
561e0360 JH |
419 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
420 | timeo = sk->sk_lingertime; | |
421 | else | |
422 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 423 | iucv_sock_wait(sk, |
0ea920d2 HB |
424 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
425 | timeo); | |
561e0360 | 426 | } |
df561f66 | 427 | fallthrough; |
561e0360 | 428 | |
05bba1ed | 429 | case IUCV_CLOSING: |
561e0360 JH |
430 | sk->sk_state = IUCV_CLOSED; |
431 | sk->sk_state_change(sk); | |
432 | ||
eac3731b JH |
433 | sk->sk_err = ECONNRESET; |
434 | sk->sk_state_change(sk); | |
435 | ||
800c5eb7 | 436 | skb_queue_purge(&iucv->send_skb_q); |
561e0360 | 437 | skb_queue_purge(&iucv->backlog_skb_q); |
df561f66 | 438 | fallthrough; |
eac3731b | 439 | |
05bba1ed | 440 | default: |
7d316b94 | 441 | iucv_sever_path(sk, 1); |
3ff50b79 | 442 | } |
eac3731b | 443 | |
800c5eb7 UB |
444 | if (iucv->hs_dev) { |
445 | dev_put(iucv->hs_dev); | |
446 | iucv->hs_dev = NULL; | |
447 | sk->sk_bound_dev_if = 0; | |
448 | } | |
449 | ||
7514bab0 HB |
450 | /* mark socket for deletion by iucv_sock_kill() */ |
451 | sock_set_flag(sk, SOCK_ZAPPED); | |
452 | ||
eac3731b | 453 | release_sock(sk); |
eac3731b JH |
454 | } |
455 | ||
456 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
457 | { | |
02f06918 | 458 | if (parent) { |
eac3731b | 459 | sk->sk_type = parent->sk_type; |
02f06918 PM |
460 | security_sk_clone(parent, sk); |
461 | } | |
eac3731b JH |
462 | } |
463 | ||
11aa9c28 | 464 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) |
eac3731b JH |
465 | { |
466 | struct sock *sk; | |
493d3971 | 467 | struct iucv_sock *iucv; |
eac3731b | 468 | |
11aa9c28 | 469 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); |
eac3731b JH |
470 | if (!sk) |
471 | return NULL; | |
493d3971 | 472 | iucv = iucv_sk(sk); |
eac3731b JH |
473 | |
474 | sock_init_data(sock, sk); | |
493d3971 UB |
475 | INIT_LIST_HEAD(&iucv->accept_q); |
476 | spin_lock_init(&iucv->accept_q_lock); | |
477 | skb_queue_head_init(&iucv->send_skb_q); | |
478 | INIT_LIST_HEAD(&iucv->message_q.list); | |
479 | spin_lock_init(&iucv->message_q.lock); | |
480 | skb_queue_head_init(&iucv->backlog_skb_q); | |
481 | iucv->send_tag = 0; | |
3881ac44 | 482 | atomic_set(&iucv->pendings, 0); |
493d3971 | 483 | iucv->flags = 0; |
3881ac44 | 484 | iucv->msglimit = 0; |
ef6af7bd | 485 | atomic_set(&iucv->skbs_in_xmit, 0); |
3881ac44 UB |
486 | atomic_set(&iucv->msg_sent, 0); |
487 | atomic_set(&iucv->msg_recv, 0); | |
493d3971 | 488 | iucv->path = NULL; |
3881ac44 | 489 | iucv->sk_txnotify = afiucv_hs_callback_txnotify; |
493d3971 | 490 | memset(&iucv->src_user_id , 0, 32); |
3881ac44 UB |
491 | if (pr_iucv) |
492 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
493 | else | |
494 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
eac3731b JH |
495 | |
496 | sk->sk_destruct = iucv_sock_destruct; | |
497 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
eac3731b JH |
498 | |
499 | sock_reset_flag(sk, SOCK_ZAPPED); | |
500 | ||
501 | sk->sk_protocol = proto; | |
502 | sk->sk_state = IUCV_OPEN; | |
503 | ||
eac3731b JH |
504 | iucv_sock_link(&iucv_sk_list, sk); |
505 | return sk; | |
506 | } | |
507 | ||
e9a36ca5 | 508 | static void iucv_accept_enqueue(struct sock *parent, struct sock *sk) |
eac3731b | 509 | { |
febca281 UB |
510 | unsigned long flags; |
511 | struct iucv_sock *par = iucv_sk(parent); | |
512 | ||
eac3731b | 513 | sock_hold(sk); |
febca281 UB |
514 | spin_lock_irqsave(&par->accept_q_lock, flags); |
515 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
516 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 517 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 518 | sk_acceptq_added(parent); |
eac3731b JH |
519 | } |
520 | ||
e9a36ca5 | 521 | static void iucv_accept_unlink(struct sock *sk) |
eac3731b | 522 | { |
febca281 UB |
523 | unsigned long flags; |
524 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
525 | ||
526 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 527 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 528 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 529 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
530 | iucv_sk(sk)->parent = NULL; |
531 | sock_put(sk); | |
532 | } | |
533 | ||
e9a36ca5 JW |
534 | static struct sock *iucv_accept_dequeue(struct sock *parent, |
535 | struct socket *newsock) | |
eac3731b JH |
536 | { |
537 | struct iucv_sock *isk, *n; | |
538 | struct sock *sk; | |
539 | ||
da99f056 | 540 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
541 | sk = (struct sock *) isk; |
542 | lock_sock(sk); | |
543 | ||
544 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 545 | iucv_accept_unlink(sk); |
febca281 | 546 | release_sock(sk); |
eac3731b JH |
547 | continue; |
548 | } | |
549 | ||
550 | if (sk->sk_state == IUCV_CONNECTED || | |
aac6399c | 551 | sk->sk_state == IUCV_DISCONN || |
eac3731b JH |
552 | !newsock) { |
553 | iucv_accept_unlink(sk); | |
554 | if (newsock) | |
555 | sock_graft(sk, newsock); | |
556 | ||
eac3731b JH |
557 | release_sock(sk); |
558 | return sk; | |
559 | } | |
560 | ||
561 | release_sock(sk); | |
562 | } | |
563 | return NULL; | |
564 | } | |
565 | ||
53a4b499 PH |
566 | static void __iucv_auto_name(struct iucv_sock *iucv) |
567 | { | |
568 | char name[12]; | |
569 | ||
570 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
571 | while (__iucv_get_sock_by_name(name)) { | |
572 | sprintf(name, "%08x", | |
573 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
574 | } | |
575 | memcpy(iucv->src_name, name, 8); | |
576 | } | |
577 | ||
eac3731b JH |
578 | /* Bind an unbound socket */ |
579 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
580 | int addr_len) | |
581 | { | |
97f8841e | 582 | DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
398999ba | 583 | char uid[sizeof(sa->siucv_user_id)]; |
eac3731b JH |
584 | struct sock *sk = sock->sk; |
585 | struct iucv_sock *iucv; | |
3881ac44 UB |
586 | int err = 0; |
587 | struct net_device *dev; | |
eac3731b JH |
588 | |
589 | /* Verify the input sockaddr */ | |
e3c42b61 MJ |
590 | if (addr_len < sizeof(struct sockaddr_iucv) || |
591 | addr->sa_family != AF_IUCV) | |
52a82e23 UB |
592 | return -EINVAL; |
593 | ||
eac3731b JH |
594 | lock_sock(sk); |
595 | if (sk->sk_state != IUCV_OPEN) { | |
596 | err = -EBADFD; | |
597 | goto done; | |
598 | } | |
599 | ||
600 | write_lock_bh(&iucv_sk_list.lock); | |
601 | ||
602 | iucv = iucv_sk(sk); | |
603 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
604 | err = -EADDRINUSE; | |
605 | goto done_unlock; | |
606 | } | |
3881ac44 | 607 | if (iucv->path) |
eac3731b | 608 | goto done_unlock; |
eac3731b JH |
609 | |
610 | /* Bind the socket */ | |
3881ac44 UB |
611 | if (pr_iucv) |
612 | if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) | |
613 | goto vm_bind; /* VM IUCV transport */ | |
eac3731b | 614 | |
3881ac44 UB |
615 | /* try hiper transport */ |
616 | memcpy(uid, sa->siucv_user_id, sizeof(uid)); | |
617 | ASCEBC(uid, 8); | |
618 | rcu_read_lock(); | |
619 | for_each_netdev_rcu(&init_net, dev) { | |
620 | if (!memcmp(dev->perm_addr, uid, 8)) { | |
3881ac44 | 621 | memcpy(iucv->src_user_id, sa->siucv_user_id, 8); |
53a4b499 PH |
622 | /* Check for unitialized siucv_name */ |
623 | if (strncmp(sa->siucv_name, " ", 8) == 0) | |
624 | __iucv_auto_name(iucv); | |
625 | else | |
626 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
816abbad | 627 | sk->sk_bound_dev_if = dev->ifindex; |
800c5eb7 UB |
628 | iucv->hs_dev = dev; |
629 | dev_hold(dev); | |
3881ac44 UB |
630 | sk->sk_state = IUCV_BOUND; |
631 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
632 | if (!iucv->msglimit) | |
633 | iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; | |
634 | rcu_read_unlock(); | |
635 | goto done_unlock; | |
636 | } | |
637 | } | |
638 | rcu_read_unlock(); | |
639 | vm_bind: | |
640 | if (pr_iucv) { | |
641 | /* use local userid for backward compat */ | |
642 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
643 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
644 | sk->sk_state = IUCV_BOUND; | |
645 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
fdbf6326 | 646 | sk->sk_allocation |= GFP_DMA; |
3881ac44 UB |
647 | if (!iucv->msglimit) |
648 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
649 | goto done_unlock; | |
650 | } | |
651 | /* found no dev to bind */ | |
652 | err = -ENODEV; | |
eac3731b JH |
653 | done_unlock: |
654 | /* Release the socket list lock */ | |
655 | write_unlock_bh(&iucv_sk_list.lock); | |
656 | done: | |
657 | release_sock(sk); | |
658 | return err; | |
659 | } | |
660 | ||
661 | /* Automatically bind an unbound socket */ | |
662 | static int iucv_sock_autobind(struct sock *sk) | |
663 | { | |
664 | struct iucv_sock *iucv = iucv_sk(sk); | |
eac3731b JH |
665 | int err = 0; |
666 | ||
aac6399c | 667 | if (unlikely(!pr_iucv)) |
eac3731b JH |
668 | return -EPROTO; |
669 | ||
aac6399c | 670 | memcpy(iucv->src_user_id, iucv_userid, 8); |
fdbf6326 JW |
671 | iucv->transport = AF_IUCV_TRANS_IUCV; |
672 | sk->sk_allocation |= GFP_DMA; | |
eac3731b JH |
673 | |
674 | write_lock_bh(&iucv_sk_list.lock); | |
53a4b499 | 675 | __iucv_auto_name(iucv); |
eac3731b JH |
676 | write_unlock_bh(&iucv_sk_list.lock); |
677 | ||
3881ac44 UB |
678 | if (!iucv->msglimit) |
679 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
680 | ||
eac3731b JH |
681 | return err; |
682 | } | |
683 | ||
3881ac44 | 684 | static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) |
eac3731b | 685 | { |
97f8841e | 686 | DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
eac3731b | 687 | struct sock *sk = sock->sk; |
493d3971 | 688 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
689 | unsigned char user_data[16]; |
690 | int err; | |
691 | ||
eac3731b | 692 | high_nmcpy(user_data, sa->siucv_name); |
493d3971 | 693 | low_nmcpy(user_data, iucv->src_name); |
eac3731b JH |
694 | ASCEBC(user_data, sizeof(user_data)); |
695 | ||
eac3731b | 696 | /* Create path. */ |
09488e2e | 697 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 698 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
699 | if (!iucv->path) { |
700 | err = -ENOMEM; | |
701 | goto done; | |
702 | } | |
6fcd61f7 FB |
703 | err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
704 | sa->siucv_user_id, NULL, user_data, | |
705 | sk); | |
eac3731b JH |
706 | if (err) { |
707 | iucv_path_free(iucv->path); | |
708 | iucv->path = NULL; | |
55cdea9e HB |
709 | switch (err) { |
710 | case 0x0b: /* Target communicator is not logged on */ | |
711 | err = -ENETUNREACH; | |
712 | break; | |
713 | case 0x0d: /* Max connections for this guest exceeded */ | |
714 | case 0x0e: /* Max connections for target guest exceeded */ | |
715 | err = -EAGAIN; | |
716 | break; | |
717 | case 0x0f: /* Missing IUCV authorization */ | |
718 | err = -EACCES; | |
719 | break; | |
720 | default: | |
721 | err = -ECONNREFUSED; | |
722 | break; | |
723 | } | |
eac3731b | 724 | } |
3881ac44 UB |
725 | done: |
726 | return err; | |
727 | } | |
eac3731b | 728 | |
3881ac44 UB |
729 | /* Connect an unconnected socket */ |
730 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
731 | int alen, int flags) | |
732 | { | |
97f8841e | 733 | DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
3881ac44 UB |
734 | struct sock *sk = sock->sk; |
735 | struct iucv_sock *iucv = iucv_sk(sk); | |
736 | int err; | |
737 | ||
e3c42b61 | 738 | if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) |
3881ac44 UB |
739 | return -EINVAL; |
740 | ||
741 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
742 | return -EBADFD; | |
743 | ||
744 | if (sk->sk_state == IUCV_OPEN && | |
745 | iucv->transport == AF_IUCV_TRANS_HIPER) | |
746 | return -EBADFD; /* explicit bind required */ | |
747 | ||
748 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) | |
749 | return -EINVAL; | |
750 | ||
751 | if (sk->sk_state == IUCV_OPEN) { | |
752 | err = iucv_sock_autobind(sk); | |
753 | if (unlikely(err)) | |
754 | return err; | |
755 | } | |
756 | ||
757 | lock_sock(sk); | |
758 | ||
759 | /* Set the destination information */ | |
760 | memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); | |
761 | memcpy(iucv->dst_name, sa->siucv_name, 8); | |
762 | ||
763 | if (iucv->transport == AF_IUCV_TRANS_HIPER) | |
9fbd87d4 | 764 | err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); |
3881ac44 UB |
765 | else |
766 | err = afiucv_path_connect(sock, addr); | |
767 | if (err) | |
768 | goto done; | |
769 | ||
770 | if (sk->sk_state != IUCV_CONNECTED) | |
0ea920d2 HB |
771 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
772 | IUCV_DISCONN), | |
773 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b | 774 | |
3881ac44 | 775 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
b8942e3b | 776 | err = -ECONNREFUSED; |
18becbc5 | 777 | |
7d316b94 UB |
778 | if (err && iucv->transport == AF_IUCV_TRANS_IUCV) |
779 | iucv_sever_path(sk, 0); | |
18becbc5 | 780 | |
eac3731b JH |
781 | done: |
782 | release_sock(sk); | |
783 | return err; | |
784 | } | |
785 | ||
786 | /* Move a socket into listening state. */ | |
787 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
788 | { | |
789 | struct sock *sk = sock->sk; | |
790 | int err; | |
791 | ||
792 | lock_sock(sk); | |
793 | ||
794 | err = -EINVAL; | |
aa8e71f5 HB |
795 | if (sk->sk_state != IUCV_BOUND) |
796 | goto done; | |
797 | ||
798 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
799 | goto done; |
800 | ||
801 | sk->sk_max_ack_backlog = backlog; | |
802 | sk->sk_ack_backlog = 0; | |
803 | sk->sk_state = IUCV_LISTEN; | |
804 | err = 0; | |
805 | ||
806 | done: | |
807 | release_sock(sk); | |
808 | return err; | |
809 | } | |
810 | ||
811 | /* Accept a pending connection */ | |
812 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
cdfbabfb | 813 | int flags, bool kern) |
eac3731b JH |
814 | { |
815 | DECLARE_WAITQUEUE(wait, current); | |
816 | struct sock *sk = sock->sk, *nsk; | |
817 | long timeo; | |
818 | int err = 0; | |
819 | ||
561e0360 | 820 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
821 | |
822 | if (sk->sk_state != IUCV_LISTEN) { | |
823 | err = -EBADFD; | |
824 | goto done; | |
825 | } | |
826 | ||
827 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
828 | ||
829 | /* Wait for an incoming connection */ | |
aa395145 | 830 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 831 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
832 | set_current_state(TASK_INTERRUPTIBLE); |
833 | if (!timeo) { | |
834 | err = -EAGAIN; | |
835 | break; | |
836 | } | |
837 | ||
838 | release_sock(sk); | |
839 | timeo = schedule_timeout(timeo); | |
561e0360 | 840 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
841 | |
842 | if (sk->sk_state != IUCV_LISTEN) { | |
843 | err = -EBADFD; | |
844 | break; | |
845 | } | |
846 | ||
847 | if (signal_pending(current)) { | |
848 | err = sock_intr_errno(timeo); | |
849 | break; | |
850 | } | |
851 | } | |
852 | ||
853 | set_current_state(TASK_RUNNING); | |
aa395145 | 854 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
855 | |
856 | if (err) | |
857 | goto done; | |
858 | ||
859 | newsock->state = SS_CONNECTED; | |
860 | ||
861 | done: | |
862 | release_sock(sk); | |
863 | return err; | |
864 | } | |
865 | ||
866 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
9b2c45d4 | 867 | int peer) |
eac3731b | 868 | { |
97f8841e | 869 | DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr); |
eac3731b | 870 | struct sock *sk = sock->sk; |
493d3971 | 871 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
872 | |
873 | addr->sa_family = AF_IUCV; | |
eac3731b JH |
874 | |
875 | if (peer) { | |
493d3971 UB |
876 | memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
877 | memcpy(siucv->siucv_name, iucv->dst_name, 8); | |
eac3731b | 878 | } else { |
493d3971 UB |
879 | memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
880 | memcpy(siucv->siucv_name, iucv->src_name, 8); | |
eac3731b JH |
881 | } |
882 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
883 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
493d3971 | 884 | memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
eac3731b | 885 | |
9b2c45d4 | 886 | return sizeof(struct sockaddr_iucv); |
eac3731b JH |
887 | } |
888 | ||
b8942e3b HB |
889 | /** |
890 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
891 | * @path: IUCV path | |
892 | * @msg: Pointer to a struct iucv_message | |
893 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
894 | * | |
895 | * Send the socket data in the parameter list in the iucv message | |
896 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
897 | * list and the socket data len at index 7 (last byte). | |
898 | * See also iucv_msg_length(). | |
899 | * | |
900 | * Returns the error code from the iucv_message_send() call. | |
901 | */ | |
902 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
903 | struct sk_buff *skb) | |
904 | { | |
905 | u8 prmdata[8]; | |
906 | ||
907 | memcpy(prmdata, (void *) skb->data, skb->len); | |
908 | prmdata[7] = 0xff - (u8) skb->len; | |
6fcd61f7 | 909 | return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
b8942e3b HB |
910 | (void *) prmdata, 8); |
911 | } | |
912 | ||
1b784140 YX |
913 | static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, |
914 | size_t len) | |
eac3731b JH |
915 | { |
916 | struct sock *sk = sock->sk; | |
917 | struct iucv_sock *iucv = iucv_sk(sk); | |
dc5367bc JW |
918 | size_t headroom = 0; |
919 | size_t linear; | |
eac3731b | 920 | struct sk_buff *skb; |
0506eb01 | 921 | struct iucv_message txmsg = {0}; |
44b1e6b5 HB |
922 | struct cmsghdr *cmsg; |
923 | int cmsg_done; | |
0ea920d2 | 924 | long timeo; |
8f7c502c UB |
925 | char user_id[9]; |
926 | char appl_id[9]; | |
eac3731b | 927 | int err; |
0ea920d2 | 928 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
929 | |
930 | err = sock_error(sk); | |
931 | if (err) | |
932 | return err; | |
933 | ||
934 | if (msg->msg_flags & MSG_OOB) | |
935 | return -EOPNOTSUPP; | |
936 | ||
aa8e71f5 HB |
937 | /* SOCK_SEQPACKET: we do not support segmented records */ |
938 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
939 | return -EOPNOTSUPP; | |
940 | ||
eac3731b JH |
941 | lock_sock(sk); |
942 | ||
943 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
944 | err = -EPIPE; | |
945 | goto out; | |
946 | } | |
947 | ||
bb664f49 HB |
948 | /* Return if the socket is not in connected state */ |
949 | if (sk->sk_state != IUCV_CONNECTED) { | |
950 | err = -ENOTCONN; | |
951 | goto out; | |
952 | } | |
44b1e6b5 | 953 | |
bb664f49 HB |
954 | /* initialize defaults */ |
955 | cmsg_done = 0; /* check for duplicate headers */ | |
44b1e6b5 | 956 | |
bb664f49 | 957 | /* iterate over control messages */ |
f95b414e | 958 | for_each_cmsghdr(cmsg, msg) { |
bb664f49 HB |
959 | if (!CMSG_OK(msg, cmsg)) { |
960 | err = -EINVAL; | |
961 | goto out; | |
962 | } | |
44b1e6b5 | 963 | |
bb664f49 HB |
964 | if (cmsg->cmsg_level != SOL_IUCV) |
965 | continue; | |
44b1e6b5 | 966 | |
bb664f49 HB |
967 | if (cmsg->cmsg_type & cmsg_done) { |
968 | err = -EINVAL; | |
969 | goto out; | |
970 | } | |
971 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 972 | |
bb664f49 HB |
973 | switch (cmsg->cmsg_type) { |
974 | case SCM_IUCV_TRGCLS: | |
975 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
976 | err = -EINVAL; |
977 | goto out; | |
978 | } | |
44b1e6b5 | 979 | |
bb664f49 HB |
980 | /* set iucv message target class */ |
981 | memcpy(&txmsg.class, | |
982 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 983 | |
bb664f49 | 984 | break; |
44b1e6b5 | 985 | |
bb664f49 HB |
986 | default: |
987 | err = -EINVAL; | |
988 | goto out; | |
44b1e6b5 | 989 | } |
bb664f49 | 990 | } |
44b1e6b5 | 991 | |
bb664f49 HB |
992 | /* allocate one skb for each iucv message: |
993 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
994 | * segmented records using the MSG_EOR flag), but | |
995 | * for SOCK_STREAM we might want to improve it in future */ | |
dc5367bc | 996 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
238965b7 JW |
997 | headroom = sizeof(struct af_iucv_trans_hdr) + |
998 | LL_RESERVED_SPACE(iucv->hs_dev); | |
e5374399 EC |
999 | linear = len; |
1000 | } else { | |
dc5367bc JW |
1001 | if (len < PAGE_SIZE) { |
1002 | linear = len; | |
1003 | } else { | |
1004 | /* In nonlinear "classic" iucv skb, | |
1005 | * reserve space for iucv_array | |
1006 | */ | |
1007 | headroom = sizeof(struct iucv_array) * | |
1008 | (MAX_SKB_FRAGS + 1); | |
1009 | linear = PAGE_SIZE - headroom; | |
1010 | } | |
e5374399 EC |
1011 | } |
1012 | skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, | |
1013 | noblock, &err, 0); | |
ed4ac422 | 1014 | if (!skb) |
bb664f49 | 1015 | goto out; |
e5374399 EC |
1016 | if (headroom) |
1017 | skb_reserve(skb, headroom); | |
1018 | skb_put(skb, linear); | |
1019 | skb->len = len; | |
1020 | skb->data_len = len - linear; | |
1021 | err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); | |
1022 | if (err) | |
bb664f49 | 1023 | goto fail; |
eac3731b | 1024 | |
0ea920d2 HB |
1025 | /* wait if outstanding messages for iucv path has reached */ |
1026 | timeo = sock_sndtimeo(sk, noblock); | |
1027 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
1028 | if (err) | |
1029 | goto fail; | |
eac3731b | 1030 | |
0ea920d2 HB |
1031 | /* return -ECONNRESET if the socket is no longer connected */ |
1032 | if (sk->sk_state != IUCV_CONNECTED) { | |
1033 | err = -ECONNRESET; | |
1034 | goto fail; | |
1035 | } | |
b8942e3b | 1036 | |
bb664f49 HB |
1037 | /* increment and save iucv message tag for msg_completion cbk */ |
1038 | txmsg.tag = iucv->send_tag++; | |
f9c41a62 | 1039 | IUCV_SKB_CB(skb)->tag = txmsg.tag; |
800c5eb7 | 1040 | |
3881ac44 UB |
1041 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1042 | atomic_inc(&iucv->msg_sent); | |
1043 | err = afiucv_hs_send(&txmsg, sk, skb, 0); | |
1044 | if (err) { | |
1045 | atomic_dec(&iucv->msg_sent); | |
b2f54394 | 1046 | goto out; |
3881ac44 | 1047 | } |
e5374399 EC |
1048 | } else { /* Classic VM IUCV transport */ |
1049 | skb_queue_tail(&iucv->send_skb_q, skb); | |
ef6af7bd | 1050 | atomic_inc(&iucv->skbs_in_xmit); |
e5374399 EC |
1051 | |
1052 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && | |
1053 | skb->len <= 7) { | |
1054 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
1055 | ||
1056 | /* on success: there is no message_complete callback */ | |
1057 | /* for an IPRMDATA msg; remove skb from send queue */ | |
1058 | if (err == 0) { | |
ef6af7bd | 1059 | atomic_dec(&iucv->skbs_in_xmit); |
e5374399 EC |
1060 | skb_unlink(skb, &iucv->send_skb_q); |
1061 | kfree_skb(skb); | |
1062 | } | |
b8942e3b | 1063 | |
e5374399 EC |
1064 | /* this error should never happen since the */ |
1065 | /* IUCV_IPRMDATA path flag is set... sever path */ | |
1066 | if (err == 0x15) { | |
1067 | pr_iucv->path_sever(iucv->path, NULL); | |
ef6af7bd | 1068 | atomic_dec(&iucv->skbs_in_xmit); |
e5374399 EC |
1069 | skb_unlink(skb, &iucv->send_skb_q); |
1070 | err = -EPIPE; | |
1071 | goto fail; | |
1072 | } | |
1073 | } else if (skb_is_nonlinear(skb)) { | |
1074 | struct iucv_array *iba = (struct iucv_array *)skb->head; | |
1075 | int i; | |
1076 | ||
1077 | /* skip iucv_array lying in the headroom */ | |
1078 | iba[0].address = (u32)(addr_t)skb->data; | |
1079 | iba[0].length = (u32)skb_headlen(skb); | |
1080 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1081 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
1082 | ||
1083 | iba[i + 1].address = | |
1084 | (u32)(addr_t)skb_frag_address(frag); | |
1085 | iba[i + 1].length = (u32)skb_frag_size(frag); | |
1086 | } | |
1087 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1088 | IUCV_IPBUFLST, 0, | |
1089 | (void *)iba, skb->len); | |
1090 | } else { /* non-IPRM Linear skb */ | |
1091 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1092 | 0, 0, (void *)skb->data, skb->len); | |
bb664f49 | 1093 | } |
e5374399 EC |
1094 | if (err) { |
1095 | if (err == 3) { | |
1096 | user_id[8] = 0; | |
1097 | memcpy(user_id, iucv->dst_user_id, 8); | |
1098 | appl_id[8] = 0; | |
1099 | memcpy(appl_id, iucv->dst_name, 8); | |
1100 | pr_err( | |
1101 | "Application %s on z/VM guest %s exceeds message limit\n", | |
1102 | appl_id, user_id); | |
1103 | err = -EAGAIN; | |
1104 | } else { | |
1105 | err = -EPIPE; | |
1106 | } | |
ef6af7bd JW |
1107 | |
1108 | atomic_dec(&iucv->skbs_in_xmit); | |
eac3731b | 1109 | skb_unlink(skb, &iucv->send_skb_q); |
eac3731b JH |
1110 | goto fail; |
1111 | } | |
eac3731b JH |
1112 | } |
1113 | ||
1114 | release_sock(sk); | |
1115 | return len; | |
1116 | ||
1117 | fail: | |
1118 | kfree_skb(skb); | |
1119 | out: | |
1120 | release_sock(sk); | |
1121 | return err; | |
1122 | } | |
1123 | ||
a006353a EC |
1124 | static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) |
1125 | { | |
1126 | size_t headroom, linear; | |
1127 | struct sk_buff *skb; | |
1128 | int err; | |
1129 | ||
1130 | if (len < PAGE_SIZE) { | |
1131 | headroom = 0; | |
1132 | linear = len; | |
1133 | } else { | |
1134 | headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); | |
1135 | linear = PAGE_SIZE - headroom; | |
1136 | } | |
1137 | skb = alloc_skb_with_frags(headroom + linear, len - linear, | |
1138 | 0, &err, GFP_ATOMIC | GFP_DMA); | |
1139 | WARN_ONCE(!skb, | |
1140 | "alloc of recv iucv skb len=%lu failed with errcode=%d\n", | |
1141 | len, err); | |
1142 | if (skb) { | |
1143 | if (headroom) | |
1144 | skb_reserve(skb, headroom); | |
1145 | skb_put(skb, linear); | |
1146 | skb->len = len; | |
1147 | skb->data_len = len - linear; | |
1148 | } | |
1149 | return skb; | |
1150 | } | |
1151 | ||
bf95d20f HB |
1152 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1153 | * | |
1154 | * Locking: must be called with message_q.lock held | |
1155 | */ | |
f0703c80 UB |
1156 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1157 | struct iucv_path *path, | |
1158 | struct iucv_message *msg) | |
1159 | { | |
1160 | int rc; | |
b8942e3b HB |
1161 | unsigned int len; |
1162 | ||
1163 | len = iucv_msg_length(msg); | |
f0703c80 | 1164 | |
44b1e6b5 HB |
1165 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1166 | /* Note: the first 4 bytes are reserved for msg tag */ | |
f9c41a62 | 1167 | IUCV_SKB_CB(skb)->class = msg->class; |
44b1e6b5 | 1168 | |
b8942e3b HB |
1169 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1170 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1171 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1172 | skb->data = NULL; | |
1173 | skb->len = 0; | |
1174 | } | |
f0703c80 | 1175 | } else { |
a006353a EC |
1176 | if (skb_is_nonlinear(skb)) { |
1177 | struct iucv_array *iba = (struct iucv_array *)skb->head; | |
1178 | int i; | |
1179 | ||
1180 | iba[0].address = (u32)(addr_t)skb->data; | |
1181 | iba[0].length = (u32)skb_headlen(skb); | |
1182 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1183 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
1184 | ||
1185 | iba[i + 1].address = | |
1186 | (u32)(addr_t)skb_frag_address(frag); | |
1187 | iba[i + 1].length = (u32)skb_frag_size(frag); | |
1188 | } | |
1189 | rc = pr_iucv->message_receive(path, msg, | |
1190 | IUCV_IPBUFLST, | |
1191 | (void *)iba, len, NULL); | |
1192 | } else { | |
1193 | rc = pr_iucv->message_receive(path, msg, | |
6fcd61f7 FB |
1194 | msg->flags & IUCV_IPRMDATA, |
1195 | skb->data, len, NULL); | |
a006353a | 1196 | } |
f0703c80 UB |
1197 | if (rc) { |
1198 | kfree_skb(skb); | |
1199 | return; | |
1200 | } | |
a006353a | 1201 | WARN_ON_ONCE(skb->len != len); |
f0703c80 UB |
1202 | } |
1203 | ||
f9c41a62 | 1204 | IUCV_SKB_CB(skb)->offset = 0; |
8c68b1a0 UB |
1205 | if (sk_filter(sk, skb)) { |
1206 | atomic_inc(&sk->sk_drops); /* skb rejected by filter */ | |
1207 | kfree_skb(skb); | |
1208 | return; | |
1209 | } | |
1210 | if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ | |
1211 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
f0703c80 UB |
1212 | } |
1213 | ||
bf95d20f HB |
1214 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1215 | * | |
1216 | * Locking: must be called with message_q.lock held | |
1217 | */ | |
f0703c80 UB |
1218 | static void iucv_process_message_q(struct sock *sk) |
1219 | { | |
1220 | struct iucv_sock *iucv = iucv_sk(sk); | |
1221 | struct sk_buff *skb; | |
1222 | struct sock_msg_q *p, *n; | |
1223 | ||
1224 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
a006353a | 1225 | skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); |
f0703c80 UB |
1226 | if (!skb) |
1227 | break; | |
1228 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1229 | list_del(&p->list); | |
1230 | kfree(p); | |
1231 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1232 | break; | |
1233 | } | |
1234 | } | |
1235 | ||
1b784140 YX |
1236 | static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1237 | size_t len, int flags) | |
eac3731b JH |
1238 | { |
1239 | int noblock = flags & MSG_DONTWAIT; | |
1240 | struct sock *sk = sock->sk; | |
561e0360 | 1241 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1242 | unsigned int copied, rlen; |
9fbd87d4 | 1243 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b | 1244 | int err = 0; |
f9c41a62 | 1245 | u32 offset; |
eac3731b | 1246 | |
aac6399c | 1247 | if ((sk->sk_state == IUCV_DISCONN) && |
f0703c80 UB |
1248 | skb_queue_empty(&iucv->backlog_skb_q) && |
1249 | skb_queue_empty(&sk->sk_receive_queue) && | |
1250 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1251 | return 0; |
1252 | ||
eac3731b JH |
1253 | if (flags & (MSG_OOB)) |
1254 | return -EOPNOTSUPP; | |
1255 | ||
60d3705f HB |
1256 | /* receive/dequeue next skb: |
1257 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1258 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1259 | if (!skb) { | |
1260 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1261 | return 0; | |
1262 | return err; | |
1263 | } | |
1264 | ||
f9c41a62 UB |
1265 | offset = IUCV_SKB_CB(skb)->offset; |
1266 | rlen = skb->len - offset; /* real length of skb */ | |
aa8e71f5 | 1267 | copied = min_t(unsigned int, rlen, len); |
82492a35 UB |
1268 | if (!rlen) |
1269 | sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; | |
eac3731b | 1270 | |
561e0360 | 1271 | cskb = skb; |
51f3d02b | 1272 | if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { |
802788bf HB |
1273 | if (!(flags & MSG_PEEK)) |
1274 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1275 | return -EFAULT; | |
eac3731b JH |
1276 | } |
1277 | ||
aa8e71f5 HB |
1278 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1279 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1280 | if (copied < rlen) | |
1281 | msg->msg_flags |= MSG_TRUNC; | |
1282 | /* each iucv message contains a complete record */ | |
1283 | msg->msg_flags |= MSG_EOR; | |
1284 | } | |
eac3731b | 1285 | |
44b1e6b5 HB |
1286 | /* create control message to store iucv msg target class: |
1287 | * get the trgcls from the control buffer of the skb due to | |
1288 | * fragmentation of original iucv message. */ | |
1289 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
f9c41a62 UB |
1290 | sizeof(IUCV_SKB_CB(skb)->class), |
1291 | (void *)&IUCV_SKB_CB(skb)->class); | |
44b1e6b5 HB |
1292 | if (err) { |
1293 | if (!(flags & MSG_PEEK)) | |
1294 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1295 | return err; | |
1296 | } | |
1297 | ||
eac3731b JH |
1298 | /* Mark read part of skb as used */ |
1299 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1300 | |
aa8e71f5 HB |
1301 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1302 | if (sk->sk_type == SOCK_STREAM) { | |
f9c41a62 UB |
1303 | if (copied < rlen) { |
1304 | IUCV_SKB_CB(skb)->offset = offset + copied; | |
2f139a5d | 1305 | skb_queue_head(&sk->sk_receive_queue, skb); |
aa8e71f5 HB |
1306 | goto done; |
1307 | } | |
eac3731b JH |
1308 | } |
1309 | ||
1310 | kfree_skb(skb); | |
800c5eb7 UB |
1311 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1312 | atomic_inc(&iucv->msg_recv); | |
1313 | if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { | |
1314 | WARN_ON(1); | |
1315 | iucv_sock_close(sk); | |
1316 | return -EFAULT; | |
1317 | } | |
1318 | } | |
561e0360 JH |
1319 | |
1320 | /* Queue backlog skbs */ | |
bf95d20f | 1321 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1322 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1323 | while (rskb) { |
f9c41a62 | 1324 | IUCV_SKB_CB(rskb)->offset = 0; |
8c68b1a0 UB |
1325 | if (__sock_queue_rcv_skb(sk, rskb)) { |
1326 | /* handle rcv queue full */ | |
f0703c80 | 1327 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1328 | rskb); |
1329 | break; | |
561e0360 | 1330 | } |
8c68b1a0 | 1331 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 | 1332 | } |
f0703c80 | 1333 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1334 | if (!list_empty(&iucv->message_q.list)) |
1335 | iucv_process_message_q(sk); | |
3881ac44 UB |
1336 | if (atomic_read(&iucv->msg_recv) >= |
1337 | iucv->msglimit / 2) { | |
9fbd87d4 | 1338 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); |
3881ac44 UB |
1339 | if (err) { |
1340 | sk->sk_state = IUCV_DISCONN; | |
1341 | sk->sk_state_change(sk); | |
1342 | } | |
1343 | } | |
f0703c80 | 1344 | } |
bf95d20f | 1345 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1346 | } |
eac3731b JH |
1347 | |
1348 | done: | |
aa8e71f5 HB |
1349 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1350 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1351 | copied = rlen; | |
1352 | ||
1353 | return copied; | |
eac3731b JH |
1354 | } |
1355 | ||
ade994f4 | 1356 | static inline __poll_t iucv_accept_poll(struct sock *parent) |
eac3731b JH |
1357 | { |
1358 | struct iucv_sock *isk, *n; | |
1359 | struct sock *sk; | |
1360 | ||
da99f056 | 1361 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1362 | sk = (struct sock *) isk; |
1363 | ||
1364 | if (sk->sk_state == IUCV_CONNECTED) | |
a9a08845 | 1365 | return EPOLLIN | EPOLLRDNORM; |
eac3731b JH |
1366 | } |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
e9a36ca5 JW |
1371 | static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, |
1372 | poll_table *wait) | |
eac3731b JH |
1373 | { |
1374 | struct sock *sk = sock->sk; | |
ade994f4 | 1375 | __poll_t mask = 0; |
eac3731b | 1376 | |
89ab066d | 1377 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 1378 | |
eac3731b JH |
1379 | if (sk->sk_state == IUCV_LISTEN) |
1380 | return iucv_accept_poll(sk); | |
1381 | ||
1382 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
a9a08845 LT |
1383 | mask |= EPOLLERR | |
1384 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); | |
eac3731b JH |
1385 | |
1386 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
a9a08845 | 1387 | mask |= EPOLLRDHUP; |
eac3731b JH |
1388 | |
1389 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
a9a08845 | 1390 | mask |= EPOLLHUP; |
eac3731b JH |
1391 | |
1392 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1393 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
a9a08845 | 1394 | mask |= EPOLLIN | EPOLLRDNORM; |
eac3731b JH |
1395 | |
1396 | if (sk->sk_state == IUCV_CLOSED) | |
a9a08845 | 1397 | mask |= EPOLLHUP; |
eac3731b | 1398 | |
aac6399c | 1399 | if (sk->sk_state == IUCV_DISCONN) |
a9a08845 | 1400 | mask |= EPOLLIN; |
561e0360 | 1401 | |
7f1b0ea4 | 1402 | if (sock_writeable(sk) && iucv_below_msglim(sk)) |
a9a08845 | 1403 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
eac3731b | 1404 | else |
9cd3e072 | 1405 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
eac3731b JH |
1406 | |
1407 | return mask; | |
1408 | } | |
1409 | ||
1410 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1411 | { | |
1412 | struct sock *sk = sock->sk; | |
1413 | struct iucv_sock *iucv = iucv_sk(sk); | |
1414 | struct iucv_message txmsg; | |
1415 | int err = 0; | |
eac3731b JH |
1416 | |
1417 | how++; | |
1418 | ||
1419 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1420 | return -EINVAL; | |
1421 | ||
1422 | lock_sock(sk); | |
da99f056 | 1423 | switch (sk->sk_state) { |
82492a35 | 1424 | case IUCV_LISTEN: |
e14ad5fa HB |
1425 | case IUCV_DISCONN: |
1426 | case IUCV_CLOSING: | |
eac3731b JH |
1427 | case IUCV_CLOSED: |
1428 | err = -ENOTCONN; | |
1429 | goto fail; | |
eac3731b | 1430 | default: |
eac3731b JH |
1431 | break; |
1432 | } | |
1433 | ||
4031eeaf UB |
1434 | if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) && |
1435 | sk->sk_state == IUCV_CONNECTED) { | |
82492a35 UB |
1436 | if (iucv->transport == AF_IUCV_TRANS_IUCV) { |
1437 | txmsg.class = 0; | |
1438 | txmsg.tag = 0; | |
1439 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1440 | IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); | |
1441 | if (err) { | |
1442 | switch (err) { | |
1443 | case 1: | |
1444 | err = -ENOTCONN; | |
1445 | break; | |
1446 | case 2: | |
1447 | err = -ECONNRESET; | |
1448 | break; | |
1449 | default: | |
1450 | err = -ENOTCONN; | |
1451 | break; | |
1452 | } | |
eac3731b | 1453 | } |
82492a35 UB |
1454 | } else |
1455 | iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); | |
eac3731b JH |
1456 | } |
1457 | ||
82492a35 | 1458 | sk->sk_shutdown |= how; |
eac3731b | 1459 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { |
1042cab8 UB |
1460 | if ((iucv->transport == AF_IUCV_TRANS_IUCV) && |
1461 | iucv->path) { | |
82492a35 UB |
1462 | err = pr_iucv->path_quiesce(iucv->path, NULL); |
1463 | if (err) | |
1464 | err = -ENOTCONN; | |
1465 | /* skb_queue_purge(&sk->sk_receive_queue); */ | |
1466 | } | |
eac3731b JH |
1467 | skb_queue_purge(&sk->sk_receive_queue); |
1468 | } | |
1469 | ||
1470 | /* Wake up anyone sleeping in poll */ | |
1471 | sk->sk_state_change(sk); | |
1472 | ||
1473 | fail: | |
1474 | release_sock(sk); | |
1475 | return err; | |
1476 | } | |
1477 | ||
1478 | static int iucv_sock_release(struct socket *sock) | |
1479 | { | |
1480 | struct sock *sk = sock->sk; | |
1481 | int err = 0; | |
1482 | ||
1483 | if (!sk) | |
1484 | return 0; | |
1485 | ||
1486 | iucv_sock_close(sk); | |
1487 | ||
eac3731b JH |
1488 | sock_orphan(sk); |
1489 | iucv_sock_kill(sk); | |
1490 | return err; | |
1491 | } | |
1492 | ||
9d5c5d8f HB |
1493 | /* getsockopt and setsockopt */ |
1494 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
a7b75c5a | 1495 | sockptr_t optval, unsigned int optlen) |
9d5c5d8f HB |
1496 | { |
1497 | struct sock *sk = sock->sk; | |
1498 | struct iucv_sock *iucv = iucv_sk(sk); | |
1499 | int val; | |
1500 | int rc; | |
1501 | ||
1502 | if (level != SOL_IUCV) | |
1503 | return -ENOPROTOOPT; | |
1504 | ||
1505 | if (optlen < sizeof(int)) | |
1506 | return -EINVAL; | |
1507 | ||
a7b75c5a | 1508 | if (copy_from_sockptr(&val, optval, sizeof(int))) |
9d5c5d8f HB |
1509 | return -EFAULT; |
1510 | ||
1511 | rc = 0; | |
1512 | ||
1513 | lock_sock(sk); | |
1514 | switch (optname) { | |
1515 | case SO_IPRMDATA_MSG: | |
1516 | if (val) | |
1517 | iucv->flags |= IUCV_IPRMDATA; | |
1518 | else | |
1519 | iucv->flags &= ~IUCV_IPRMDATA; | |
1520 | break; | |
09488e2e HB |
1521 | case SO_MSGLIMIT: |
1522 | switch (sk->sk_state) { | |
1523 | case IUCV_OPEN: | |
1524 | case IUCV_BOUND: | |
0d1c7664 | 1525 | if (val < 1 || val > U16_MAX) |
09488e2e HB |
1526 | rc = -EINVAL; |
1527 | else | |
1528 | iucv->msglimit = val; | |
1529 | break; | |
1530 | default: | |
1531 | rc = -EINVAL; | |
1532 | break; | |
1533 | } | |
1534 | break; | |
9d5c5d8f HB |
1535 | default: |
1536 | rc = -ENOPROTOOPT; | |
1537 | break; | |
1538 | } | |
1539 | release_sock(sk); | |
1540 | ||
1541 | return rc; | |
1542 | } | |
1543 | ||
1544 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1545 | char __user *optval, int __user *optlen) | |
1546 | { | |
1547 | struct sock *sk = sock->sk; | |
1548 | struct iucv_sock *iucv = iucv_sk(sk); | |
51363b87 UB |
1549 | unsigned int val; |
1550 | int len; | |
9d5c5d8f HB |
1551 | |
1552 | if (level != SOL_IUCV) | |
1553 | return -ENOPROTOOPT; | |
1554 | ||
1555 | if (get_user(len, optlen)) | |
1556 | return -EFAULT; | |
1557 | ||
1558 | if (len < 0) | |
1559 | return -EINVAL; | |
1560 | ||
1561 | len = min_t(unsigned int, len, sizeof(int)); | |
1562 | ||
1563 | switch (optname) { | |
1564 | case SO_IPRMDATA_MSG: | |
1565 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1566 | break; | |
09488e2e HB |
1567 | case SO_MSGLIMIT: |
1568 | lock_sock(sk); | |
1569 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1570 | : iucv->msglimit; /* default */ | |
1571 | release_sock(sk); | |
1572 | break; | |
51363b87 UB |
1573 | case SO_MSGSIZE: |
1574 | if (sk->sk_state == IUCV_OPEN) | |
1575 | return -EBADFD; | |
1576 | val = (iucv->hs_dev) ? iucv->hs_dev->mtu - | |
1577 | sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : | |
1578 | 0x7fffffff; | |
1579 | break; | |
9d5c5d8f HB |
1580 | default: |
1581 | return -ENOPROTOOPT; | |
1582 | } | |
1583 | ||
1584 | if (put_user(len, optlen)) | |
1585 | return -EFAULT; | |
1586 | if (copy_to_user(optval, &val, len)) | |
1587 | return -EFAULT; | |
1588 | ||
1589 | return 0; | |
1590 | } | |
1591 | ||
1592 | ||
eac3731b JH |
1593 | /* Callback wrappers - called from iucv base support */ |
1594 | static int iucv_callback_connreq(struct iucv_path *path, | |
1595 | u8 ipvmid[8], u8 ipuser[16]) | |
1596 | { | |
1597 | unsigned char user_data[16]; | |
1598 | unsigned char nuser_data[16]; | |
1599 | unsigned char src_name[8]; | |
eac3731b JH |
1600 | struct sock *sk, *nsk; |
1601 | struct iucv_sock *iucv, *niucv; | |
1602 | int err; | |
1603 | ||
1604 | memcpy(src_name, ipuser, 8); | |
1605 | EBCASC(src_name, 8); | |
1606 | /* Find out if this path belongs to af_iucv. */ | |
1607 | read_lock(&iucv_sk_list.lock); | |
1608 | iucv = NULL; | |
febca281 | 1609 | sk = NULL; |
b67bfe0d | 1610 | sk_for_each(sk, &iucv_sk_list.head) |
eac3731b JH |
1611 | if (sk->sk_state == IUCV_LISTEN && |
1612 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1613 | /* | |
1614 | * Found a listening socket with | |
1615 | * src_name == ipuser[0-7]. | |
1616 | */ | |
1617 | iucv = iucv_sk(sk); | |
1618 | break; | |
1619 | } | |
1620 | read_unlock(&iucv_sk_list.lock); | |
1621 | if (!iucv) | |
1622 | /* No socket found, not one of our paths. */ | |
1623 | return -EINVAL; | |
1624 | ||
1625 | bh_lock_sock(sk); | |
1626 | ||
1627 | /* Check if parent socket is listening */ | |
1628 | low_nmcpy(user_data, iucv->src_name); | |
1629 | high_nmcpy(user_data, iucv->dst_name); | |
1630 | ASCEBC(user_data, sizeof(user_data)); | |
1631 | if (sk->sk_state != IUCV_LISTEN) { | |
6fcd61f7 | 1632 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1633 | iucv_path_free(path); |
eac3731b JH |
1634 | goto fail; |
1635 | } | |
1636 | ||
1637 | /* Check for backlog size */ | |
1638 | if (sk_acceptq_is_full(sk)) { | |
6fcd61f7 | 1639 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1640 | iucv_path_free(path); |
eac3731b JH |
1641 | goto fail; |
1642 | } | |
1643 | ||
1644 | /* Create the new socket */ | |
c5dab094 | 1645 | nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); |
da99f056 | 1646 | if (!nsk) { |
6fcd61f7 | 1647 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1648 | iucv_path_free(path); |
eac3731b JH |
1649 | goto fail; |
1650 | } | |
1651 | ||
1652 | niucv = iucv_sk(nsk); | |
1653 | iucv_sock_init(nsk, sk); | |
fdbf6326 JW |
1654 | niucv->transport = AF_IUCV_TRANS_IUCV; |
1655 | nsk->sk_allocation |= GFP_DMA; | |
eac3731b JH |
1656 | |
1657 | /* Set the new iucv_sock */ | |
1658 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1659 | EBCASC(niucv->dst_name, 8); | |
1660 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1661 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1662 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1663 | niucv->path = path; | |
1664 | ||
1665 | /* Call iucv_accept */ | |
1666 | high_nmcpy(nuser_data, ipuser + 8); | |
1667 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1668 | ASCEBC(nuser_data + 8, 8); | |
1669 | ||
09488e2e HB |
1670 | /* set message limit for path based on msglimit of accepting socket */ |
1671 | niucv->msglimit = iucv->msglimit; | |
1672 | path->msglim = iucv->msglimit; | |
6fcd61f7 | 1673 | err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1674 | if (err) { |
7d316b94 | 1675 | iucv_sever_path(nsk, 1); |
65dbd7c2 | 1676 | iucv_sock_kill(nsk); |
eac3731b JH |
1677 | goto fail; |
1678 | } | |
1679 | ||
1680 | iucv_accept_enqueue(sk, nsk); | |
1681 | ||
1682 | /* Wake up accept */ | |
1683 | nsk->sk_state = IUCV_CONNECTED; | |
676d2369 | 1684 | sk->sk_data_ready(sk); |
eac3731b JH |
1685 | err = 0; |
1686 | fail: | |
1687 | bh_unlock_sock(sk); | |
1688 | return 0; | |
1689 | } | |
1690 | ||
1691 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1692 | { | |
1693 | struct sock *sk = path->private; | |
1694 | ||
1695 | sk->sk_state = IUCV_CONNECTED; | |
1696 | sk->sk_state_change(sk); | |
1697 | } | |
1698 | ||
1699 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1700 | { | |
1701 | struct sock *sk = path->private; | |
561e0360 | 1702 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1703 | struct sk_buff *skb; |
1704 | struct sock_msg_q *save_msg; | |
1705 | int len; | |
561e0360 | 1706 | |
fe86e54e | 1707 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
6fcd61f7 | 1708 | pr_iucv->message_reject(path, msg); |
eac3731b | 1709 | return; |
fe86e54e | 1710 | } |
eac3731b | 1711 | |
3fa6b5ad | 1712 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1713 | |
f0703c80 UB |
1714 | if (!list_empty(&iucv->message_q.list) || |
1715 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1716 | goto save_message; | |
1717 | ||
1718 | len = atomic_read(&sk->sk_rmem_alloc); | |
87fb4b7b | 1719 | len += SKB_TRUESIZE(iucv_msg_length(msg)); |
f0703c80 UB |
1720 | if (len > sk->sk_rcvbuf) |
1721 | goto save_message; | |
1722 | ||
a006353a | 1723 | skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); |
f0703c80 UB |
1724 | if (!skb) |
1725 | goto save_message; | |
eac3731b | 1726 | |
f0703c80 | 1727 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1728 | goto out_unlock; |
eac3731b | 1729 | |
f0703c80 UB |
1730 | save_message: |
1731 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1732 | if (!save_msg) |
a56635a5 | 1733 | goto out_unlock; |
f0703c80 UB |
1734 | save_msg->path = path; |
1735 | save_msg->msg = *msg; | |
eac3731b | 1736 | |
f0703c80 | 1737 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1738 | |
1739 | out_unlock: | |
f0703c80 | 1740 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1741 | } |
1742 | ||
1743 | static void iucv_callback_txdone(struct iucv_path *path, | |
1744 | struct iucv_message *msg) | |
1745 | { | |
1746 | struct sock *sk = path->private; | |
f2a77991 | 1747 | struct sk_buff *this = NULL; |
ef6af7bd | 1748 | struct sk_buff_head *list; |
9e733177 | 1749 | struct sk_buff *list_skb; |
ef6af7bd | 1750 | struct iucv_sock *iucv; |
eac3731b JH |
1751 | unsigned long flags; |
1752 | ||
ef6af7bd JW |
1753 | iucv = iucv_sk(sk); |
1754 | list = &iucv->send_skb_q; | |
1755 | ||
7d316b94 | 1756 | bh_lock_sock(sk); |
561e0360 | 1757 | |
9e733177 DM |
1758 | spin_lock_irqsave(&list->lock, flags); |
1759 | skb_queue_walk(list, list_skb) { | |
1760 | if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { | |
1761 | this = list_skb; | |
1762 | break; | |
f2a77991 | 1763 | } |
9e733177 | 1764 | } |
ef6af7bd JW |
1765 | if (this) { |
1766 | atomic_dec(&iucv->skbs_in_xmit); | |
9e733177 | 1767 | __skb_unlink(this, list); |
ef6af7bd JW |
1768 | } |
1769 | ||
9e733177 | 1770 | spin_unlock_irqrestore(&list->lock, flags); |
eac3731b | 1771 | |
9e733177 DM |
1772 | if (this) { |
1773 | kfree_skb(this); | |
1774 | /* wake up any process waiting for sending */ | |
1775 | iucv_sock_wake_msglim(sk); | |
561e0360 | 1776 | } |
eac3731b | 1777 | |
da99f056 | 1778 | if (sk->sk_state == IUCV_CLOSING) { |
ef6af7bd | 1779 | if (atomic_read(&iucv->skbs_in_xmit) == 0) { |
561e0360 JH |
1780 | sk->sk_state = IUCV_CLOSED; |
1781 | sk->sk_state_change(sk); | |
1782 | } | |
1783 | } | |
7d316b94 | 1784 | bh_unlock_sock(sk); |
eac3731b | 1785 | |
eac3731b JH |
1786 | } |
1787 | ||
1788 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1789 | { | |
1790 | struct sock *sk = path->private; | |
1791 | ||
7d316b94 UB |
1792 | if (sk->sk_state == IUCV_CLOSED) |
1793 | return; | |
1794 | ||
1795 | bh_lock_sock(sk); | |
1796 | iucv_sever_path(sk, 1); | |
aac6399c | 1797 | sk->sk_state = IUCV_DISCONN; |
eac3731b JH |
1798 | |
1799 | sk->sk_state_change(sk); | |
7d316b94 | 1800 | bh_unlock_sock(sk); |
eac3731b JH |
1801 | } |
1802 | ||
af88b52d HB |
1803 | /* called if the other communication side shuts down its RECV direction; |
1804 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1805 | */ | |
1806 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1807 | { | |
1808 | struct sock *sk = path->private; | |
1809 | ||
1810 | bh_lock_sock(sk); | |
1811 | if (sk->sk_state != IUCV_CLOSED) { | |
1812 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1813 | sk->sk_state_change(sk); | |
1814 | } | |
1815 | bh_unlock_sock(sk); | |
1816 | } | |
1817 | ||
3881ac44 UB |
1818 | /***************** HiperSockets transport callbacks ********************/ |
1819 | static void afiucv_swap_src_dest(struct sk_buff *skb) | |
1820 | { | |
cd11d112 | 1821 | struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); |
3881ac44 UB |
1822 | char tmpID[8]; |
1823 | char tmpName[8]; | |
1824 | ||
1825 | ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
1826 | ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
1827 | ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
1828 | ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
1829 | memcpy(tmpID, trans_hdr->srcUserID, 8); | |
1830 | memcpy(tmpName, trans_hdr->srcAppName, 8); | |
1831 | memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); | |
1832 | memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); | |
1833 | memcpy(trans_hdr->destUserID, tmpID, 8); | |
1834 | memcpy(trans_hdr->destAppName, tmpName, 8); | |
1835 | skb_push(skb, ETH_HLEN); | |
1836 | memset(skb->data, 0, ETH_HLEN); | |
1837 | } | |
1838 | ||
1839 | /** | |
1840 | * afiucv_hs_callback_syn - react on received SYN | |
1841 | **/ | |
1842 | static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) | |
1843 | { | |
cd11d112 | 1844 | struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); |
3881ac44 UB |
1845 | struct sock *nsk; |
1846 | struct iucv_sock *iucv, *niucv; | |
3881ac44 UB |
1847 | int err; |
1848 | ||
1849 | iucv = iucv_sk(sk); | |
3881ac44 UB |
1850 | if (!iucv) { |
1851 | /* no sock - connection refused */ | |
1852 | afiucv_swap_src_dest(skb); | |
1853 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1854 | err = dev_queue_xmit(skb); | |
1855 | goto out; | |
1856 | } | |
1857 | ||
c5dab094 | 1858 | nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); |
3881ac44 UB |
1859 | bh_lock_sock(sk); |
1860 | if ((sk->sk_state != IUCV_LISTEN) || | |
1861 | sk_acceptq_is_full(sk) || | |
1862 | !nsk) { | |
1863 | /* error on server socket - connection refused */ | |
3881ac44 UB |
1864 | afiucv_swap_src_dest(skb); |
1865 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1866 | err = dev_queue_xmit(skb); | |
4d520f62 | 1867 | iucv_sock_kill(nsk); |
3881ac44 UB |
1868 | bh_unlock_sock(sk); |
1869 | goto out; | |
1870 | } | |
1871 | ||
1872 | niucv = iucv_sk(nsk); | |
1873 | iucv_sock_init(nsk, sk); | |
1874 | niucv->transport = AF_IUCV_TRANS_HIPER; | |
1875 | niucv->msglimit = iucv->msglimit; | |
1876 | if (!trans_hdr->window) | |
1877 | niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; | |
1878 | else | |
1879 | niucv->msglimit_peer = trans_hdr->window; | |
1880 | memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); | |
1881 | memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); | |
1882 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1883 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1884 | nsk->sk_bound_dev_if = sk->sk_bound_dev_if; | |
800c5eb7 UB |
1885 | niucv->hs_dev = iucv->hs_dev; |
1886 | dev_hold(niucv->hs_dev); | |
3881ac44 UB |
1887 | afiucv_swap_src_dest(skb); |
1888 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; | |
1889 | trans_hdr->window = niucv->msglimit; | |
1890 | /* if receiver acks the xmit connection is established */ | |
1891 | err = dev_queue_xmit(skb); | |
1892 | if (!err) { | |
1893 | iucv_accept_enqueue(sk, nsk); | |
1894 | nsk->sk_state = IUCV_CONNECTED; | |
676d2369 | 1895 | sk->sk_data_ready(sk); |
3881ac44 UB |
1896 | } else |
1897 | iucv_sock_kill(nsk); | |
1898 | bh_unlock_sock(sk); | |
1899 | ||
1900 | out: | |
1901 | return NET_RX_SUCCESS; | |
1902 | } | |
1903 | ||
1904 | /** | |
1905 | * afiucv_hs_callback_synack() - react on received SYN-ACK | |
1906 | **/ | |
1907 | static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) | |
1908 | { | |
1909 | struct iucv_sock *iucv = iucv_sk(sk); | |
3881ac44 UB |
1910 | |
1911 | if (!iucv) | |
1912 | goto out; | |
1913 | if (sk->sk_state != IUCV_BOUND) | |
1914 | goto out; | |
1915 | bh_lock_sock(sk); | |
cd11d112 | 1916 | iucv->msglimit_peer = iucv_trans_hdr(skb)->window; |
3881ac44 UB |
1917 | sk->sk_state = IUCV_CONNECTED; |
1918 | sk->sk_state_change(sk); | |
1919 | bh_unlock_sock(sk); | |
1920 | out: | |
1921 | kfree_skb(skb); | |
1922 | return NET_RX_SUCCESS; | |
1923 | } | |
1924 | ||
1925 | /** | |
1926 | * afiucv_hs_callback_synfin() - react on received SYN_FIN | |
1927 | **/ | |
1928 | static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) | |
1929 | { | |
1930 | struct iucv_sock *iucv = iucv_sk(sk); | |
1931 | ||
1932 | if (!iucv) | |
1933 | goto out; | |
1934 | if (sk->sk_state != IUCV_BOUND) | |
1935 | goto out; | |
1936 | bh_lock_sock(sk); | |
1937 | sk->sk_state = IUCV_DISCONN; | |
1938 | sk->sk_state_change(sk); | |
1939 | bh_unlock_sock(sk); | |
1940 | out: | |
1941 | kfree_skb(skb); | |
1942 | return NET_RX_SUCCESS; | |
1943 | } | |
1944 | ||
1945 | /** | |
1946 | * afiucv_hs_callback_fin() - react on received FIN | |
1947 | **/ | |
1948 | static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) | |
1949 | { | |
1950 | struct iucv_sock *iucv = iucv_sk(sk); | |
1951 | ||
1952 | /* other end of connection closed */ | |
800c5eb7 UB |
1953 | if (!iucv) |
1954 | goto out; | |
1955 | bh_lock_sock(sk); | |
1956 | if (sk->sk_state == IUCV_CONNECTED) { | |
aac6399c | 1957 | sk->sk_state = IUCV_DISCONN; |
3881ac44 | 1958 | sk->sk_state_change(sk); |
3881ac44 | 1959 | } |
800c5eb7 UB |
1960 | bh_unlock_sock(sk); |
1961 | out: | |
3881ac44 UB |
1962 | kfree_skb(skb); |
1963 | return NET_RX_SUCCESS; | |
1964 | } | |
1965 | ||
1966 | /** | |
1967 | * afiucv_hs_callback_win() - react on received WIN | |
1968 | **/ | |
1969 | static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) | |
1970 | { | |
1971 | struct iucv_sock *iucv = iucv_sk(sk); | |
3881ac44 UB |
1972 | |
1973 | if (!iucv) | |
1974 | return NET_RX_SUCCESS; | |
1975 | ||
1976 | if (sk->sk_state != IUCV_CONNECTED) | |
1977 | return NET_RX_SUCCESS; | |
1978 | ||
cd11d112 | 1979 | atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); |
3881ac44 UB |
1980 | iucv_sock_wake_msglim(sk); |
1981 | return NET_RX_SUCCESS; | |
1982 | } | |
1983 | ||
1984 | /** | |
1985 | * afiucv_hs_callback_rx() - react on received data | |
1986 | **/ | |
1987 | static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) | |
1988 | { | |
1989 | struct iucv_sock *iucv = iucv_sk(sk); | |
1990 | ||
1991 | if (!iucv) { | |
1992 | kfree_skb(skb); | |
1993 | return NET_RX_SUCCESS; | |
1994 | } | |
1995 | ||
1996 | if (sk->sk_state != IUCV_CONNECTED) { | |
1997 | kfree_skb(skb); | |
1998 | return NET_RX_SUCCESS; | |
1999 | } | |
2000 | ||
82492a35 UB |
2001 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
2002 | kfree_skb(skb); | |
2003 | return NET_RX_SUCCESS; | |
2004 | } | |
2005 | ||
979f66b3 | 2006 | /* write stuff from iucv_msg to skb cb */ |
3881ac44 UB |
2007 | skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); |
2008 | skb_reset_transport_header(skb); | |
2009 | skb_reset_network_header(skb); | |
f9c41a62 | 2010 | IUCV_SKB_CB(skb)->offset = 0; |
8c68b1a0 UB |
2011 | if (sk_filter(sk, skb)) { |
2012 | atomic_inc(&sk->sk_drops); /* skb rejected by filter */ | |
2013 | kfree_skb(skb); | |
2014 | return NET_RX_SUCCESS; | |
2015 | } | |
2016 | ||
3881ac44 UB |
2017 | spin_lock(&iucv->message_q.lock); |
2018 | if (skb_queue_empty(&iucv->backlog_skb_q)) { | |
8c68b1a0 | 2019 | if (__sock_queue_rcv_skb(sk, skb)) |
3881ac44 UB |
2020 | /* handle rcv queue full */ |
2021 | skb_queue_tail(&iucv->backlog_skb_q, skb); | |
3881ac44 UB |
2022 | } else |
2023 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
2024 | spin_unlock(&iucv->message_q.lock); | |
2025 | return NET_RX_SUCCESS; | |
2026 | } | |
2027 | ||
2028 | /** | |
2029 | * afiucv_hs_rcv() - base function for arriving data through HiperSockets | |
2030 | * transport | |
2031 | * called from netif RX softirq | |
2032 | **/ | |
2033 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, | |
2034 | struct packet_type *pt, struct net_device *orig_dev) | |
2035 | { | |
3881ac44 UB |
2036 | struct sock *sk; |
2037 | struct iucv_sock *iucv; | |
2038 | struct af_iucv_trans_hdr *trans_hdr; | |
22244099 | 2039 | int err = NET_RX_SUCCESS; |
3881ac44 | 2040 | char nullstring[8]; |
3881ac44 | 2041 | |
cd11d112 | 2042 | if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { |
979f66b3 EC |
2043 | kfree_skb(skb); |
2044 | return NET_RX_SUCCESS; | |
2045 | } | |
cd11d112 JW |
2046 | |
2047 | trans_hdr = iucv_trans_hdr(skb); | |
3881ac44 UB |
2048 | EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); |
2049 | EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
2050 | EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
2051 | EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
2052 | memset(nullstring, 0, sizeof(nullstring)); | |
2053 | iucv = NULL; | |
2054 | sk = NULL; | |
2055 | read_lock(&iucv_sk_list.lock); | |
b67bfe0d | 2056 | sk_for_each(sk, &iucv_sk_list.head) { |
3881ac44 UB |
2057 | if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { |
2058 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2059 | trans_hdr->destAppName, 8)) && | |
2060 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2061 | trans_hdr->destUserID, 8)) && | |
2062 | (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && | |
2063 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2064 | nullstring, 8))) { | |
2065 | iucv = iucv_sk(sk); | |
2066 | break; | |
2067 | } | |
2068 | } else { | |
2069 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2070 | trans_hdr->destAppName, 8)) && | |
2071 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2072 | trans_hdr->destUserID, 8)) && | |
2073 | (!memcmp(&iucv_sk(sk)->dst_name, | |
2074 | trans_hdr->srcAppName, 8)) && | |
2075 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2076 | trans_hdr->srcUserID, 8))) { | |
2077 | iucv = iucv_sk(sk); | |
2078 | break; | |
2079 | } | |
2080 | } | |
2081 | } | |
2082 | read_unlock(&iucv_sk_list.lock); | |
2083 | if (!iucv) | |
2084 | sk = NULL; | |
2085 | ||
2086 | /* no sock | |
2087 | how should we send with no sock | |
2088 | 1) send without sock no send rc checking? | |
2089 | 2) introduce default sock to handle this cases | |
2090 | ||
2091 | SYN -> send SYN|ACK in good case, send SYN|FIN in bad case | |
2092 | data -> send FIN | |
2093 | SYN|ACK, SYN|FIN, FIN -> no action? */ | |
2094 | ||
2095 | switch (trans_hdr->flags) { | |
2096 | case AF_IUCV_FLAG_SYN: | |
2097 | /* connect request */ | |
2098 | err = afiucv_hs_callback_syn(sk, skb); | |
2099 | break; | |
2100 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): | |
2101 | /* connect request confirmed */ | |
2102 | err = afiucv_hs_callback_synack(sk, skb); | |
2103 | break; | |
2104 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): | |
2105 | /* connect request refused */ | |
2106 | err = afiucv_hs_callback_synfin(sk, skb); | |
2107 | break; | |
2108 | case (AF_IUCV_FLAG_FIN): | |
2109 | /* close request */ | |
2110 | err = afiucv_hs_callback_fin(sk, skb); | |
2111 | break; | |
2112 | case (AF_IUCV_FLAG_WIN): | |
2113 | err = afiucv_hs_callback_win(sk, skb); | |
800c5eb7 UB |
2114 | if (skb->len == sizeof(struct af_iucv_trans_hdr)) { |
2115 | kfree_skb(skb); | |
2116 | break; | |
2117 | } | |
df561f66 | 2118 | fallthrough; /* and receive non-zero length data */ |
82492a35 UB |
2119 | case (AF_IUCV_FLAG_SHT): |
2120 | /* shutdown request */ | |
df561f66 | 2121 | fallthrough; /* and receive zero length data */ |
3881ac44 UB |
2122 | case 0: |
2123 | /* plain data frame */ | |
f9c41a62 | 2124 | IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; |
3881ac44 UB |
2125 | err = afiucv_hs_callback_rx(sk, skb); |
2126 | break; | |
2127 | default: | |
22244099 | 2128 | kfree_skb(skb); |
3881ac44 UB |
2129 | } |
2130 | ||
2131 | return err; | |
2132 | } | |
2133 | ||
2134 | /** | |
2135 | * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets | |
2136 | * transport | |
2137 | **/ | |
80bc97aa | 2138 | static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n) |
3881ac44 | 2139 | { |
80bc97aa | 2140 | struct iucv_sock *iucv = iucv_sk(sk); |
3881ac44 | 2141 | |
c464444f | 2142 | if (sock_flag(sk, SOCK_ZAPPED)) |
3881ac44 UB |
2143 | return; |
2144 | ||
80bc97aa JW |
2145 | switch (n) { |
2146 | case TX_NOTIFY_OK: | |
2147 | atomic_dec(&iucv->skbs_in_xmit); | |
2148 | iucv_sock_wake_msglim(sk); | |
2149 | break; | |
2150 | case TX_NOTIFY_PENDING: | |
2151 | atomic_inc(&iucv->pendings); | |
2152 | break; | |
2153 | case TX_NOTIFY_DELAYED_OK: | |
2154 | atomic_dec(&iucv->skbs_in_xmit); | |
2155 | if (atomic_dec_return(&iucv->pendings) <= 0) | |
2156 | iucv_sock_wake_msglim(sk); | |
2157 | break; | |
2158 | default: | |
2159 | atomic_dec(&iucv->skbs_in_xmit); | |
2160 | if (sk->sk_state == IUCV_CONNECTED) { | |
2161 | sk->sk_state = IUCV_DISCONN; | |
2162 | sk->sk_state_change(sk); | |
3881ac44 | 2163 | } |
3881ac44 | 2164 | } |
3881ac44 | 2165 | |
42bd48e0 | 2166 | if (sk->sk_state == IUCV_CLOSING) { |
ef6af7bd | 2167 | if (atomic_read(&iucv->skbs_in_xmit) == 0) { |
42bd48e0 UB |
2168 | sk->sk_state = IUCV_CLOSED; |
2169 | sk->sk_state_change(sk); | |
2170 | } | |
2171 | } | |
3881ac44 | 2172 | } |
9fbd87d4 UB |
2173 | |
2174 | /* | |
2175 | * afiucv_netdev_event: handle netdev notifier chain events | |
2176 | */ | |
2177 | static int afiucv_netdev_event(struct notifier_block *this, | |
2178 | unsigned long event, void *ptr) | |
2179 | { | |
351638e7 | 2180 | struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); |
9fbd87d4 UB |
2181 | struct sock *sk; |
2182 | struct iucv_sock *iucv; | |
2183 | ||
2184 | switch (event) { | |
2185 | case NETDEV_REBOOT: | |
2186 | case NETDEV_GOING_DOWN: | |
b67bfe0d | 2187 | sk_for_each(sk, &iucv_sk_list.head) { |
9fbd87d4 UB |
2188 | iucv = iucv_sk(sk); |
2189 | if ((iucv->hs_dev == event_dev) && | |
2190 | (sk->sk_state == IUCV_CONNECTED)) { | |
2191 | if (event == NETDEV_GOING_DOWN) | |
2192 | iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); | |
2193 | sk->sk_state = IUCV_DISCONN; | |
2194 | sk->sk_state_change(sk); | |
2195 | } | |
2196 | } | |
2197 | break; | |
2198 | case NETDEV_DOWN: | |
2199 | case NETDEV_UNREGISTER: | |
2200 | default: | |
2201 | break; | |
2202 | } | |
2203 | return NOTIFY_DONE; | |
2204 | } | |
2205 | ||
2206 | static struct notifier_block afiucv_netdev_notifier = { | |
2207 | .notifier_call = afiucv_netdev_event, | |
2208 | }; | |
2209 | ||
5708e868 | 2210 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
2211 | .family = PF_IUCV, |
2212 | .owner = THIS_MODULE, | |
2213 | .release = iucv_sock_release, | |
2214 | .bind = iucv_sock_bind, | |
2215 | .connect = iucv_sock_connect, | |
2216 | .listen = iucv_sock_listen, | |
2217 | .accept = iucv_sock_accept, | |
2218 | .getname = iucv_sock_getname, | |
2219 | .sendmsg = iucv_sock_sendmsg, | |
2220 | .recvmsg = iucv_sock_recvmsg, | |
a11e1d43 | 2221 | .poll = iucv_sock_poll, |
eac3731b JH |
2222 | .ioctl = sock_no_ioctl, |
2223 | .mmap = sock_no_mmap, | |
2224 | .socketpair = sock_no_socketpair, | |
2225 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
2226 | .setsockopt = iucv_sock_setsockopt, |
2227 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
2228 | }; |
2229 | ||
e9a36ca5 JW |
2230 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
2231 | int kern) | |
2232 | { | |
2233 | struct sock *sk; | |
2234 | ||
2235 | if (protocol && protocol != PF_IUCV) | |
2236 | return -EPROTONOSUPPORT; | |
2237 | ||
2238 | sock->state = SS_UNCONNECTED; | |
2239 | ||
2240 | switch (sock->type) { | |
2241 | case SOCK_STREAM: | |
2242 | case SOCK_SEQPACKET: | |
2243 | /* currently, proto ops can handle both sk types */ | |
2244 | sock->ops = &iucv_sock_ops; | |
2245 | break; | |
2246 | default: | |
2247 | return -ESOCKTNOSUPPORT; | |
2248 | } | |
2249 | ||
2250 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); | |
2251 | if (!sk) | |
2252 | return -ENOMEM; | |
2253 | ||
2254 | iucv_sock_init(sk, NULL); | |
2255 | ||
2256 | return 0; | |
2257 | } | |
2258 | ||
ec1b4cf7 | 2259 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
2260 | .family = AF_IUCV, |
2261 | .owner = THIS_MODULE, | |
2262 | .create = iucv_sock_create, | |
2263 | }; | |
2264 | ||
3881ac44 UB |
2265 | static struct packet_type iucv_packet_type = { |
2266 | .type = cpu_to_be16(ETH_P_AF_IUCV), | |
2267 | .func = afiucv_hs_rcv, | |
2268 | }; | |
2269 | ||
2270 | static int afiucv_iucv_init(void) | |
6fcd61f7 | 2271 | { |
585bc220 | 2272 | return pr_iucv->iucv_register(&af_iucv_handler, 0); |
6fcd61f7 FB |
2273 | } |
2274 | ||
06996c1d JW |
2275 | static void afiucv_iucv_exit(void) |
2276 | { | |
06996c1d JW |
2277 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); |
2278 | } | |
2279 | ||
da99f056 | 2280 | static int __init afiucv_init(void) |
eac3731b JH |
2281 | { |
2282 | int err; | |
2283 | ||
3881ac44 UB |
2284 | if (MACHINE_IS_VM) { |
2285 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); | |
2286 | if (unlikely(err)) { | |
2287 | WARN_ON(err); | |
2288 | err = -EPROTONOSUPPORT; | |
2289 | goto out; | |
2290 | } | |
eac3731b | 2291 | |
3881ac44 UB |
2292 | pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); |
2293 | if (!pr_iucv) { | |
2294 | printk(KERN_WARNING "iucv_if lookup failed\n"); | |
2295 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2296 | } | |
2297 | } else { | |
2298 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2299 | pr_iucv = NULL; | |
6fcd61f7 FB |
2300 | } |
2301 | ||
eac3731b JH |
2302 | err = proto_register(&iucv_proto, 0); |
2303 | if (err) | |
6fcd61f7 | 2304 | goto out; |
eac3731b JH |
2305 | err = sock_register(&iucv_sock_family_ops); |
2306 | if (err) | |
2307 | goto out_proto; | |
6fcd61f7 | 2308 | |
3881ac44 UB |
2309 | if (pr_iucv) { |
2310 | err = afiucv_iucv_init(); | |
2311 | if (err) | |
2312 | goto out_sock; | |
06996c1d JW |
2313 | } |
2314 | ||
2315 | err = register_netdevice_notifier(&afiucv_netdev_notifier); | |
2316 | if (err) | |
2317 | goto out_notifier; | |
2318 | ||
3881ac44 | 2319 | dev_add_pack(&iucv_packet_type); |
eac3731b JH |
2320 | return 0; |
2321 | ||
06996c1d JW |
2322 | out_notifier: |
2323 | if (pr_iucv) | |
2324 | afiucv_iucv_exit(); | |
c23cad92 UB |
2325 | out_sock: |
2326 | sock_unregister(PF_IUCV); | |
eac3731b JH |
2327 | out_proto: |
2328 | proto_unregister(&iucv_proto); | |
eac3731b | 2329 | out: |
6fcd61f7 FB |
2330 | if (pr_iucv) |
2331 | symbol_put(iucv_if); | |
eac3731b JH |
2332 | return err; |
2333 | } | |
2334 | ||
2335 | static void __exit afiucv_exit(void) | |
2336 | { | |
3881ac44 | 2337 | if (pr_iucv) { |
06996c1d | 2338 | afiucv_iucv_exit(); |
3881ac44 | 2339 | symbol_put(iucv_if); |
06996c1d JW |
2340 | } |
2341 | ||
2342 | unregister_netdevice_notifier(&afiucv_netdev_notifier); | |
3881ac44 | 2343 | dev_remove_pack(&iucv_packet_type); |
eac3731b JH |
2344 | sock_unregister(PF_IUCV); |
2345 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2346 | } |
2347 | ||
2348 | module_init(afiucv_init); | |
2349 | module_exit(afiucv_exit); | |
2350 | ||
2351 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
2352 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
2353 | MODULE_VERSION(VERSION); | |
2354 | MODULE_LICENSE("GPL"); | |
2355 | MODULE_ALIAS_NETPROTO(PF_IUCV); |