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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 | 46 | static struct iucv_interface *pr_iucv; |
87c272c6 | 47 | static struct iucv_handler af_iucv_handler; |
6fcd61f7 | 48 | |
b8942e3b HB |
49 | /* special AF_IUCV IPRM messages */ |
50 | static const u8 iprm_shutdown[8] = | |
51 | {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; | |
52 | ||
c593642c | 53 | #define TRGCLS_SIZE sizeof_field(struct iucv_message, class) |
44b1e6b5 | 54 | |
0ea920d2 HB |
55 | #define __iucv_sock_wait(sk, condition, timeo, ret) \ |
56 | do { \ | |
57 | DEFINE_WAIT(__wait); \ | |
58 | long __timeo = timeo; \ | |
59 | ret = 0; \ | |
aa395145 | 60 | prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ |
0ea920d2 | 61 | while (!(condition)) { \ |
0ea920d2 HB |
62 | if (!__timeo) { \ |
63 | ret = -EAGAIN; \ | |
64 | break; \ | |
65 | } \ | |
66 | if (signal_pending(current)) { \ | |
67 | ret = sock_intr_errno(__timeo); \ | |
68 | break; \ | |
69 | } \ | |
70 | release_sock(sk); \ | |
71 | __timeo = schedule_timeout(__timeo); \ | |
72 | lock_sock(sk); \ | |
73 | ret = sock_error(sk); \ | |
74 | if (ret) \ | |
75 | break; \ | |
76 | } \ | |
aa395145 | 77 | finish_wait(sk_sleep(sk), &__wait); \ |
0ea920d2 HB |
78 | } while (0) |
79 | ||
80 | #define iucv_sock_wait(sk, condition, timeo) \ | |
81 | ({ \ | |
82 | int __ret = 0; \ | |
83 | if (!(condition)) \ | |
84 | __iucv_sock_wait(sk, condition, timeo, __ret); \ | |
85 | __ret; \ | |
86 | }) | |
44b1e6b5 | 87 | |
e9a36ca5 JW |
88 | static struct sock *iucv_accept_dequeue(struct sock *parent, |
89 | struct socket *newsock); | |
57f20448 HC |
90 | static void iucv_sock_kill(struct sock *sk); |
91 | static void iucv_sock_close(struct sock *sk); | |
92 | ||
80bc97aa | 93 | static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify); |
3881ac44 | 94 | |
eac3731b | 95 | static struct iucv_sock_list iucv_sk_list = { |
3db8ce35 | 96 | .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), |
eac3731b JH |
97 | .autobind_name = ATOMIC_INIT(0) |
98 | }; | |
99 | ||
eac3731b JH |
100 | static inline void high_nmcpy(unsigned char *dst, char *src) |
101 | { | |
102 | memcpy(dst, src, 8); | |
103 | } | |
104 | ||
105 | static inline void low_nmcpy(unsigned char *dst, char *src) | |
106 | { | |
107 | memcpy(&dst[8], src, 8); | |
108 | } | |
109 | ||
b8942e3b HB |
110 | /** |
111 | * iucv_msg_length() - Returns the length of an iucv message. | |
112 | * @msg: Pointer to struct iucv_message, MUST NOT be NULL | |
113 | * | |
114 | * The function returns the length of the specified iucv message @msg of data | |
115 | * stored in a buffer and of data stored in the parameter list (PRMDATA). | |
116 | * | |
117 | * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket | |
118 | * data: | |
119 | * PRMDATA[0..6] socket data (max 7 bytes); | |
120 | * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) | |
121 | * | |
25985edc | 122 | * The socket data length is computed by subtracting the socket data length |
b8942e3b HB |
123 | * value from 0xFF. |
124 | * If the socket data len is greater 7, then PRMDATA can be used for special | |
125 | * notifications (see iucv_sock_shutdown); and further, | |
126 | * if the socket data len is > 7, the function returns 8. | |
127 | * | |
128 | * Use this function to allocate socket buffers to store iucv message data. | |
129 | */ | |
130 | static inline size_t iucv_msg_length(struct iucv_message *msg) | |
131 | { | |
132 | size_t datalen; | |
133 | ||
134 | if (msg->flags & IUCV_IPRMDATA) { | |
135 | datalen = 0xff - msg->rmmsg[7]; | |
136 | return (datalen < 8) ? datalen : 8; | |
137 | } | |
138 | return msg->length; | |
139 | } | |
140 | ||
0ea920d2 HB |
141 | /** |
142 | * iucv_sock_in_state() - check for specific states | |
143 | * @sk: sock structure | |
144 | * @state: first iucv sk state | |
145 | * @state: second iucv sk state | |
146 | * | |
147 | * Returns true if the socket in either in the first or second state. | |
148 | */ | |
149 | static int iucv_sock_in_state(struct sock *sk, int state, int state2) | |
150 | { | |
151 | return (sk->sk_state == state || sk->sk_state == state2); | |
152 | } | |
153 | ||
154 | /** | |
155 | * iucv_below_msglim() - function to check if messages can be sent | |
156 | * @sk: sock structure | |
157 | * | |
158 | * Returns true if the send queue length is lower than the message limit. | |
159 | * Always returns true if the socket is not connected (no iucv path for | |
160 | * checking the message limit). | |
161 | */ | |
162 | static inline int iucv_below_msglim(struct sock *sk) | |
163 | { | |
164 | struct iucv_sock *iucv = iucv_sk(sk); | |
165 | ||
166 | if (sk->sk_state != IUCV_CONNECTED) | |
167 | return 1; | |
3881ac44 | 168 | if (iucv->transport == AF_IUCV_TRANS_IUCV) |
ef6af7bd | 169 | return (atomic_read(&iucv->skbs_in_xmit) < iucv->path->msglim); |
3881ac44 UB |
170 | else |
171 | return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && | |
172 | (atomic_read(&iucv->pendings) <= 0)); | |
0ea920d2 HB |
173 | } |
174 | ||
175 | /** | |
176 | * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit | |
177 | */ | |
178 | static void iucv_sock_wake_msglim(struct sock *sk) | |
179 | { | |
43815482 ED |
180 | struct socket_wq *wq; |
181 | ||
182 | rcu_read_lock(); | |
183 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 184 | if (skwq_has_sleeper(wq)) |
43815482 | 185 | wake_up_interruptible_all(&wq->wait); |
0ea920d2 | 186 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
43815482 | 187 | rcu_read_unlock(); |
0ea920d2 HB |
188 | } |
189 | ||
3881ac44 UB |
190 | /** |
191 | * afiucv_hs_send() - send a message through HiperSockets transport | |
192 | */ | |
193 | static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, | |
194 | struct sk_buff *skb, u8 flags) | |
195 | { | |
3881ac44 UB |
196 | struct iucv_sock *iucv = iucv_sk(sock); |
197 | struct af_iucv_trans_hdr *phs_hdr; | |
3881ac44 UB |
198 | int err, confirm_recv = 0; |
199 | ||
cd11d112 JW |
200 | phs_hdr = skb_push(skb, sizeof(*phs_hdr)); |
201 | memset(phs_hdr, 0, sizeof(*phs_hdr)); | |
3881ac44 | 202 | skb_reset_network_header(skb); |
3881ac44 UB |
203 | |
204 | phs_hdr->magic = ETH_P_AF_IUCV; | |
205 | phs_hdr->version = 1; | |
206 | phs_hdr->flags = flags; | |
207 | if (flags == AF_IUCV_FLAG_SYN) | |
208 | phs_hdr->window = iucv->msglimit; | |
209 | else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { | |
210 | confirm_recv = atomic_read(&iucv->msg_recv); | |
211 | phs_hdr->window = confirm_recv; | |
212 | if (confirm_recv) | |
213 | phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; | |
214 | } | |
215 | memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); | |
216 | memcpy(phs_hdr->destAppName, iucv->dst_name, 8); | |
217 | memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); | |
218 | memcpy(phs_hdr->srcAppName, iucv->src_name, 8); | |
219 | ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); | |
220 | ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); | |
221 | ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); | |
222 | ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); | |
223 | if (imsg) | |
224 | memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); | |
225 | ||
800c5eb7 | 226 | skb->dev = iucv->hs_dev; |
b2f54394 JW |
227 | if (!skb->dev) { |
228 | err = -ENODEV; | |
229 | goto err_free; | |
230 | } | |
238965b7 JW |
231 | |
232 | dev_hard_header(skb, skb->dev, ETH_P_AF_IUCV, NULL, NULL, skb->len); | |
233 | ||
b2f54394 JW |
234 | if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { |
235 | err = -ENETDOWN; | |
236 | goto err_free; | |
237 | } | |
3881ac44 | 238 | if (skb->len > skb->dev->mtu) { |
b2f54394 JW |
239 | if (sock->sk_type == SOCK_SEQPACKET) { |
240 | err = -EMSGSIZE; | |
241 | goto err_free; | |
242 | } | |
2c3b4456 JW |
243 | err = pskb_trim(skb, skb->dev->mtu); |
244 | if (err) | |
245 | goto err_free; | |
3881ac44 | 246 | } |
2e56c26b | 247 | skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); |
238965b7 | 248 | |
ef6af7bd | 249 | atomic_inc(&iucv->skbs_in_xmit); |
3881ac44 | 250 | err = dev_queue_xmit(skb); |
800c5eb7 | 251 | if (net_xmit_eval(err)) { |
ef6af7bd | 252 | atomic_dec(&iucv->skbs_in_xmit); |
3881ac44 UB |
253 | } else { |
254 | atomic_sub(confirm_recv, &iucv->msg_recv); | |
255 | WARN_ON(atomic_read(&iucv->msg_recv) < 0); | |
256 | } | |
800c5eb7 | 257 | return net_xmit_eval(err); |
b2f54394 JW |
258 | |
259 | err_free: | |
260 | kfree_skb(skb); | |
261 | return err; | |
3881ac44 UB |
262 | } |
263 | ||
eac3731b JH |
264 | static struct sock *__iucv_get_sock_by_name(char *nm) |
265 | { | |
266 | struct sock *sk; | |
eac3731b | 267 | |
b67bfe0d | 268 | sk_for_each(sk, &iucv_sk_list.head) |
eac3731b JH |
269 | if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) |
270 | return sk; | |
271 | ||
272 | return NULL; | |
273 | } | |
274 | ||
275 | static void iucv_sock_destruct(struct sock *sk) | |
276 | { | |
277 | skb_queue_purge(&sk->sk_receive_queue); | |
82492a35 UB |
278 | skb_queue_purge(&sk->sk_error_queue); |
279 | ||
280 | sk_mem_reclaim(sk); | |
281 | ||
282 | if (!sock_flag(sk, SOCK_DEAD)) { | |
283 | pr_err("Attempt to release alive iucv socket %p\n", sk); | |
284 | return; | |
285 | } | |
286 | ||
287 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); | |
b2c9c5df | 288 | WARN_ON(refcount_read(&sk->sk_wmem_alloc)); |
82492a35 UB |
289 | WARN_ON(sk->sk_wmem_queued); |
290 | WARN_ON(sk->sk_forward_alloc); | |
eac3731b JH |
291 | } |
292 | ||
293 | /* Cleanup Listen */ | |
294 | static void iucv_sock_cleanup_listen(struct sock *parent) | |
295 | { | |
296 | struct sock *sk; | |
297 | ||
298 | /* Close non-accepted connections */ | |
299 | while ((sk = iucv_accept_dequeue(parent, NULL))) { | |
300 | iucv_sock_close(sk); | |
301 | iucv_sock_kill(sk); | |
302 | } | |
303 | ||
304 | parent->sk_state = IUCV_CLOSED; | |
eac3731b JH |
305 | } |
306 | ||
e9a36ca5 JW |
307 | static void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) |
308 | { | |
309 | write_lock_bh(&l->lock); | |
310 | sk_add_node(sk, &l->head); | |
311 | write_unlock_bh(&l->lock); | |
312 | } | |
313 | ||
314 | static void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) | |
315 | { | |
316 | write_lock_bh(&l->lock); | |
317 | sk_del_node_init(sk); | |
318 | write_unlock_bh(&l->lock); | |
319 | } | |
320 | ||
7514bab0 | 321 | /* Kill socket (only if zapped and orphaned) */ |
eac3731b JH |
322 | static void iucv_sock_kill(struct sock *sk) |
323 | { | |
324 | if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) | |
325 | return; | |
326 | ||
327 | iucv_sock_unlink(&iucv_sk_list, sk); | |
328 | sock_set_flag(sk, SOCK_DEAD); | |
329 | sock_put(sk); | |
330 | } | |
331 | ||
7d316b94 UB |
332 | /* Terminate an IUCV path */ |
333 | static void iucv_sever_path(struct sock *sk, int with_user_data) | |
334 | { | |
335 | unsigned char user_data[16]; | |
336 | struct iucv_sock *iucv = iucv_sk(sk); | |
337 | struct iucv_path *path = iucv->path; | |
338 | ||
339 | if (iucv->path) { | |
340 | iucv->path = NULL; | |
341 | if (with_user_data) { | |
342 | low_nmcpy(user_data, iucv->src_name); | |
343 | high_nmcpy(user_data, iucv->dst_name); | |
344 | ASCEBC(user_data, sizeof(user_data)); | |
345 | pr_iucv->path_sever(path, user_data); | |
346 | } else | |
347 | pr_iucv->path_sever(path, NULL); | |
348 | iucv_path_free(path); | |
349 | } | |
350 | } | |
351 | ||
4e0ad322 | 352 | /* Send controlling flags through an IUCV socket for HIPER transport */ |
9fbd87d4 UB |
353 | static int iucv_send_ctrl(struct sock *sk, u8 flags) |
354 | { | |
238965b7 | 355 | struct iucv_sock *iucv = iucv_sk(sk); |
9fbd87d4 UB |
356 | int err = 0; |
357 | int blen; | |
358 | struct sk_buff *skb; | |
4e0ad322 | 359 | u8 shutdown = 0; |
9fbd87d4 | 360 | |
238965b7 JW |
361 | blen = sizeof(struct af_iucv_trans_hdr) + |
362 | LL_RESERVED_SPACE(iucv->hs_dev); | |
4e0ad322 UB |
363 | if (sk->sk_shutdown & SEND_SHUTDOWN) { |
364 | /* controlling flags should be sent anyway */ | |
365 | shutdown = sk->sk_shutdown; | |
366 | sk->sk_shutdown &= RCV_SHUTDOWN; | |
367 | } | |
9fbd87d4 UB |
368 | skb = sock_alloc_send_skb(sk, blen, 1, &err); |
369 | if (skb) { | |
370 | skb_reserve(skb, blen); | |
371 | err = afiucv_hs_send(NULL, sk, skb, flags); | |
372 | } | |
4e0ad322 UB |
373 | if (shutdown) |
374 | sk->sk_shutdown = shutdown; | |
9fbd87d4 UB |
375 | return err; |
376 | } | |
377 | ||
eac3731b JH |
378 | /* Close an IUCV socket */ |
379 | static void iucv_sock_close(struct sock *sk) | |
380 | { | |
eac3731b | 381 | struct iucv_sock *iucv = iucv_sk(sk); |
561e0360 | 382 | unsigned long timeo; |
800c5eb7 | 383 | int err = 0; |
eac3731b | 384 | |
eac3731b JH |
385 | lock_sock(sk); |
386 | ||
da99f056 | 387 | switch (sk->sk_state) { |
eac3731b JH |
388 | case IUCV_LISTEN: |
389 | iucv_sock_cleanup_listen(sk); | |
390 | break; | |
391 | ||
392 | case IUCV_CONNECTED: | |
3881ac44 | 393 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
9fbd87d4 | 394 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); |
3881ac44 UB |
395 | sk->sk_state = IUCV_DISCONN; |
396 | sk->sk_state_change(sk); | |
397 | } | |
df561f66 | 398 | fallthrough; |
05bba1ed GS |
399 | |
400 | case IUCV_DISCONN: | |
561e0360 JH |
401 | sk->sk_state = IUCV_CLOSING; |
402 | sk->sk_state_change(sk); | |
403 | ||
ef6af7bd | 404 | if (!err && atomic_read(&iucv->skbs_in_xmit) > 0) { |
561e0360 JH |
405 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) |
406 | timeo = sk->sk_lingertime; | |
407 | else | |
408 | timeo = IUCV_DISCONN_TIMEOUT; | |
9f6298a6 | 409 | iucv_sock_wait(sk, |
0ea920d2 HB |
410 | iucv_sock_in_state(sk, IUCV_CLOSED, 0), |
411 | timeo); | |
561e0360 | 412 | } |
df561f66 | 413 | fallthrough; |
561e0360 | 414 | |
05bba1ed | 415 | case IUCV_CLOSING: |
561e0360 JH |
416 | sk->sk_state = IUCV_CLOSED; |
417 | sk->sk_state_change(sk); | |
418 | ||
eac3731b JH |
419 | sk->sk_err = ECONNRESET; |
420 | sk->sk_state_change(sk); | |
421 | ||
800c5eb7 | 422 | skb_queue_purge(&iucv->send_skb_q); |
561e0360 | 423 | skb_queue_purge(&iucv->backlog_skb_q); |
df561f66 | 424 | fallthrough; |
eac3731b | 425 | |
05bba1ed | 426 | default: |
7d316b94 | 427 | iucv_sever_path(sk, 1); |
3ff50b79 | 428 | } |
eac3731b | 429 | |
800c5eb7 UB |
430 | if (iucv->hs_dev) { |
431 | dev_put(iucv->hs_dev); | |
432 | iucv->hs_dev = NULL; | |
433 | sk->sk_bound_dev_if = 0; | |
434 | } | |
435 | ||
7514bab0 HB |
436 | /* mark socket for deletion by iucv_sock_kill() */ |
437 | sock_set_flag(sk, SOCK_ZAPPED); | |
438 | ||
eac3731b | 439 | release_sock(sk); |
eac3731b JH |
440 | } |
441 | ||
442 | static void iucv_sock_init(struct sock *sk, struct sock *parent) | |
443 | { | |
02f06918 | 444 | if (parent) { |
eac3731b | 445 | sk->sk_type = parent->sk_type; |
02f06918 PM |
446 | security_sk_clone(parent, sk); |
447 | } | |
eac3731b JH |
448 | } |
449 | ||
11aa9c28 | 450 | static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) |
eac3731b JH |
451 | { |
452 | struct sock *sk; | |
493d3971 | 453 | struct iucv_sock *iucv; |
eac3731b | 454 | |
11aa9c28 | 455 | sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); |
eac3731b JH |
456 | if (!sk) |
457 | return NULL; | |
493d3971 | 458 | iucv = iucv_sk(sk); |
eac3731b JH |
459 | |
460 | sock_init_data(sock, sk); | |
493d3971 UB |
461 | INIT_LIST_HEAD(&iucv->accept_q); |
462 | spin_lock_init(&iucv->accept_q_lock); | |
463 | skb_queue_head_init(&iucv->send_skb_q); | |
464 | INIT_LIST_HEAD(&iucv->message_q.list); | |
465 | spin_lock_init(&iucv->message_q.lock); | |
466 | skb_queue_head_init(&iucv->backlog_skb_q); | |
467 | iucv->send_tag = 0; | |
3881ac44 | 468 | atomic_set(&iucv->pendings, 0); |
493d3971 | 469 | iucv->flags = 0; |
3881ac44 | 470 | iucv->msglimit = 0; |
ef6af7bd | 471 | atomic_set(&iucv->skbs_in_xmit, 0); |
3881ac44 UB |
472 | atomic_set(&iucv->msg_sent, 0); |
473 | atomic_set(&iucv->msg_recv, 0); | |
493d3971 | 474 | iucv->path = NULL; |
3881ac44 | 475 | iucv->sk_txnotify = afiucv_hs_callback_txnotify; |
493d3971 | 476 | memset(&iucv->src_user_id , 0, 32); |
3881ac44 UB |
477 | if (pr_iucv) |
478 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
479 | else | |
480 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
eac3731b JH |
481 | |
482 | sk->sk_destruct = iucv_sock_destruct; | |
483 | sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; | |
eac3731b JH |
484 | |
485 | sock_reset_flag(sk, SOCK_ZAPPED); | |
486 | ||
487 | sk->sk_protocol = proto; | |
488 | sk->sk_state = IUCV_OPEN; | |
489 | ||
eac3731b JH |
490 | iucv_sock_link(&iucv_sk_list, sk); |
491 | return sk; | |
492 | } | |
493 | ||
e9a36ca5 | 494 | static void iucv_accept_enqueue(struct sock *parent, struct sock *sk) |
eac3731b | 495 | { |
febca281 UB |
496 | unsigned long flags; |
497 | struct iucv_sock *par = iucv_sk(parent); | |
498 | ||
eac3731b | 499 | sock_hold(sk); |
febca281 UB |
500 | spin_lock_irqsave(&par->accept_q_lock, flags); |
501 | list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); | |
502 | spin_unlock_irqrestore(&par->accept_q_lock, flags); | |
eac3731b | 503 | iucv_sk(sk)->parent = parent; |
49f5eba7 | 504 | sk_acceptq_added(parent); |
eac3731b JH |
505 | } |
506 | ||
e9a36ca5 | 507 | static void iucv_accept_unlink(struct sock *sk) |
eac3731b | 508 | { |
febca281 UB |
509 | unsigned long flags; |
510 | struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); | |
511 | ||
512 | spin_lock_irqsave(&par->accept_q_lock, flags); | |
eac3731b | 513 | list_del_init(&iucv_sk(sk)->accept_q); |
febca281 | 514 | spin_unlock_irqrestore(&par->accept_q_lock, flags); |
49f5eba7 | 515 | sk_acceptq_removed(iucv_sk(sk)->parent); |
eac3731b JH |
516 | iucv_sk(sk)->parent = NULL; |
517 | sock_put(sk); | |
518 | } | |
519 | ||
e9a36ca5 JW |
520 | static struct sock *iucv_accept_dequeue(struct sock *parent, |
521 | struct socket *newsock) | |
eac3731b JH |
522 | { |
523 | struct iucv_sock *isk, *n; | |
524 | struct sock *sk; | |
525 | ||
da99f056 | 526 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
527 | sk = (struct sock *) isk; |
528 | lock_sock(sk); | |
529 | ||
530 | if (sk->sk_state == IUCV_CLOSED) { | |
eac3731b | 531 | iucv_accept_unlink(sk); |
febca281 | 532 | release_sock(sk); |
eac3731b JH |
533 | continue; |
534 | } | |
535 | ||
536 | if (sk->sk_state == IUCV_CONNECTED || | |
aac6399c | 537 | sk->sk_state == IUCV_DISCONN || |
eac3731b JH |
538 | !newsock) { |
539 | iucv_accept_unlink(sk); | |
540 | if (newsock) | |
541 | sock_graft(sk, newsock); | |
542 | ||
eac3731b JH |
543 | release_sock(sk); |
544 | return sk; | |
545 | } | |
546 | ||
547 | release_sock(sk); | |
548 | } | |
549 | return NULL; | |
550 | } | |
551 | ||
53a4b499 PH |
552 | static void __iucv_auto_name(struct iucv_sock *iucv) |
553 | { | |
554 | char name[12]; | |
555 | ||
556 | sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); | |
557 | while (__iucv_get_sock_by_name(name)) { | |
558 | sprintf(name, "%08x", | |
559 | atomic_inc_return(&iucv_sk_list.autobind_name)); | |
560 | } | |
561 | memcpy(iucv->src_name, name, 8); | |
562 | } | |
563 | ||
eac3731b JH |
564 | /* Bind an unbound socket */ |
565 | static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, | |
566 | int addr_len) | |
567 | { | |
97f8841e | 568 | DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
398999ba | 569 | char uid[sizeof(sa->siucv_user_id)]; |
eac3731b JH |
570 | struct sock *sk = sock->sk; |
571 | struct iucv_sock *iucv; | |
3881ac44 UB |
572 | int err = 0; |
573 | struct net_device *dev; | |
eac3731b JH |
574 | |
575 | /* Verify the input sockaddr */ | |
e3c42b61 MJ |
576 | if (addr_len < sizeof(struct sockaddr_iucv) || |
577 | addr->sa_family != AF_IUCV) | |
52a82e23 UB |
578 | return -EINVAL; |
579 | ||
eac3731b JH |
580 | lock_sock(sk); |
581 | if (sk->sk_state != IUCV_OPEN) { | |
582 | err = -EBADFD; | |
583 | goto done; | |
584 | } | |
585 | ||
586 | write_lock_bh(&iucv_sk_list.lock); | |
587 | ||
588 | iucv = iucv_sk(sk); | |
589 | if (__iucv_get_sock_by_name(sa->siucv_name)) { | |
590 | err = -EADDRINUSE; | |
591 | goto done_unlock; | |
592 | } | |
3881ac44 | 593 | if (iucv->path) |
eac3731b | 594 | goto done_unlock; |
eac3731b JH |
595 | |
596 | /* Bind the socket */ | |
3881ac44 UB |
597 | if (pr_iucv) |
598 | if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) | |
599 | goto vm_bind; /* VM IUCV transport */ | |
eac3731b | 600 | |
3881ac44 UB |
601 | /* try hiper transport */ |
602 | memcpy(uid, sa->siucv_user_id, sizeof(uid)); | |
603 | ASCEBC(uid, 8); | |
604 | rcu_read_lock(); | |
605 | for_each_netdev_rcu(&init_net, dev) { | |
606 | if (!memcmp(dev->perm_addr, uid, 8)) { | |
3881ac44 | 607 | memcpy(iucv->src_user_id, sa->siucv_user_id, 8); |
bf05d48d | 608 | /* Check for uninitialized siucv_name */ |
53a4b499 PH |
609 | if (strncmp(sa->siucv_name, " ", 8) == 0) |
610 | __iucv_auto_name(iucv); | |
611 | else | |
612 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
816abbad | 613 | sk->sk_bound_dev_if = dev->ifindex; |
800c5eb7 UB |
614 | iucv->hs_dev = dev; |
615 | dev_hold(dev); | |
3881ac44 UB |
616 | sk->sk_state = IUCV_BOUND; |
617 | iucv->transport = AF_IUCV_TRANS_HIPER; | |
618 | if (!iucv->msglimit) | |
619 | iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; | |
620 | rcu_read_unlock(); | |
621 | goto done_unlock; | |
622 | } | |
623 | } | |
624 | rcu_read_unlock(); | |
625 | vm_bind: | |
626 | if (pr_iucv) { | |
627 | /* use local userid for backward compat */ | |
628 | memcpy(iucv->src_name, sa->siucv_name, 8); | |
629 | memcpy(iucv->src_user_id, iucv_userid, 8); | |
630 | sk->sk_state = IUCV_BOUND; | |
631 | iucv->transport = AF_IUCV_TRANS_IUCV; | |
fdbf6326 | 632 | sk->sk_allocation |= GFP_DMA; |
3881ac44 UB |
633 | if (!iucv->msglimit) |
634 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
635 | goto done_unlock; | |
636 | } | |
637 | /* found no dev to bind */ | |
638 | err = -ENODEV; | |
eac3731b JH |
639 | done_unlock: |
640 | /* Release the socket list lock */ | |
641 | write_unlock_bh(&iucv_sk_list.lock); | |
642 | done: | |
643 | release_sock(sk); | |
644 | return err; | |
645 | } | |
646 | ||
647 | /* Automatically bind an unbound socket */ | |
648 | static int iucv_sock_autobind(struct sock *sk) | |
649 | { | |
650 | struct iucv_sock *iucv = iucv_sk(sk); | |
eac3731b JH |
651 | int err = 0; |
652 | ||
aac6399c | 653 | if (unlikely(!pr_iucv)) |
eac3731b JH |
654 | return -EPROTO; |
655 | ||
aac6399c | 656 | memcpy(iucv->src_user_id, iucv_userid, 8); |
fdbf6326 JW |
657 | iucv->transport = AF_IUCV_TRANS_IUCV; |
658 | sk->sk_allocation |= GFP_DMA; | |
eac3731b JH |
659 | |
660 | write_lock_bh(&iucv_sk_list.lock); | |
53a4b499 | 661 | __iucv_auto_name(iucv); |
eac3731b JH |
662 | write_unlock_bh(&iucv_sk_list.lock); |
663 | ||
3881ac44 UB |
664 | if (!iucv->msglimit) |
665 | iucv->msglimit = IUCV_QUEUELEN_DEFAULT; | |
666 | ||
eac3731b JH |
667 | return err; |
668 | } | |
669 | ||
3881ac44 | 670 | static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) |
eac3731b | 671 | { |
97f8841e | 672 | DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
eac3731b | 673 | struct sock *sk = sock->sk; |
493d3971 | 674 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
675 | unsigned char user_data[16]; |
676 | int err; | |
677 | ||
eac3731b | 678 | high_nmcpy(user_data, sa->siucv_name); |
493d3971 | 679 | low_nmcpy(user_data, iucv->src_name); |
eac3731b JH |
680 | ASCEBC(user_data, sizeof(user_data)); |
681 | ||
eac3731b | 682 | /* Create path. */ |
09488e2e | 683 | iucv->path = iucv_path_alloc(iucv->msglimit, |
b8942e3b | 684 | IUCV_IPRMDATA, GFP_KERNEL); |
d4444722 UB |
685 | if (!iucv->path) { |
686 | err = -ENOMEM; | |
687 | goto done; | |
688 | } | |
6fcd61f7 FB |
689 | err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, |
690 | sa->siucv_user_id, NULL, user_data, | |
691 | sk); | |
eac3731b JH |
692 | if (err) { |
693 | iucv_path_free(iucv->path); | |
694 | iucv->path = NULL; | |
55cdea9e HB |
695 | switch (err) { |
696 | case 0x0b: /* Target communicator is not logged on */ | |
697 | err = -ENETUNREACH; | |
698 | break; | |
699 | case 0x0d: /* Max connections for this guest exceeded */ | |
700 | case 0x0e: /* Max connections for target guest exceeded */ | |
701 | err = -EAGAIN; | |
702 | break; | |
703 | case 0x0f: /* Missing IUCV authorization */ | |
704 | err = -EACCES; | |
705 | break; | |
706 | default: | |
707 | err = -ECONNREFUSED; | |
708 | break; | |
709 | } | |
eac3731b | 710 | } |
3881ac44 UB |
711 | done: |
712 | return err; | |
713 | } | |
eac3731b | 714 | |
3881ac44 UB |
715 | /* Connect an unconnected socket */ |
716 | static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, | |
717 | int alen, int flags) | |
718 | { | |
97f8841e | 719 | DECLARE_SOCKADDR(struct sockaddr_iucv *, sa, addr); |
3881ac44 UB |
720 | struct sock *sk = sock->sk; |
721 | struct iucv_sock *iucv = iucv_sk(sk); | |
722 | int err; | |
723 | ||
e3c42b61 | 724 | if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) |
3881ac44 UB |
725 | return -EINVAL; |
726 | ||
727 | if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) | |
728 | return -EBADFD; | |
729 | ||
730 | if (sk->sk_state == IUCV_OPEN && | |
731 | iucv->transport == AF_IUCV_TRANS_HIPER) | |
732 | return -EBADFD; /* explicit bind required */ | |
733 | ||
734 | if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) | |
735 | return -EINVAL; | |
736 | ||
737 | if (sk->sk_state == IUCV_OPEN) { | |
738 | err = iucv_sock_autobind(sk); | |
739 | if (unlikely(err)) | |
740 | return err; | |
741 | } | |
742 | ||
743 | lock_sock(sk); | |
744 | ||
745 | /* Set the destination information */ | |
746 | memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); | |
747 | memcpy(iucv->dst_name, sa->siucv_name, 8); | |
748 | ||
749 | if (iucv->transport == AF_IUCV_TRANS_HIPER) | |
9fbd87d4 | 750 | err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); |
3881ac44 UB |
751 | else |
752 | err = afiucv_path_connect(sock, addr); | |
753 | if (err) | |
754 | goto done; | |
755 | ||
756 | if (sk->sk_state != IUCV_CONNECTED) | |
0ea920d2 HB |
757 | err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, |
758 | IUCV_DISCONN), | |
759 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
eac3731b | 760 | |
3881ac44 | 761 | if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) |
b8942e3b | 762 | err = -ECONNREFUSED; |
18becbc5 | 763 | |
7d316b94 UB |
764 | if (err && iucv->transport == AF_IUCV_TRANS_IUCV) |
765 | iucv_sever_path(sk, 0); | |
18becbc5 | 766 | |
eac3731b JH |
767 | done: |
768 | release_sock(sk); | |
769 | return err; | |
770 | } | |
771 | ||
772 | /* Move a socket into listening state. */ | |
773 | static int iucv_sock_listen(struct socket *sock, int backlog) | |
774 | { | |
775 | struct sock *sk = sock->sk; | |
776 | int err; | |
777 | ||
778 | lock_sock(sk); | |
779 | ||
780 | err = -EINVAL; | |
aa8e71f5 HB |
781 | if (sk->sk_state != IUCV_BOUND) |
782 | goto done; | |
783 | ||
784 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) | |
eac3731b JH |
785 | goto done; |
786 | ||
787 | sk->sk_max_ack_backlog = backlog; | |
788 | sk->sk_ack_backlog = 0; | |
789 | sk->sk_state = IUCV_LISTEN; | |
790 | err = 0; | |
791 | ||
792 | done: | |
793 | release_sock(sk); | |
794 | return err; | |
795 | } | |
796 | ||
797 | /* Accept a pending connection */ | |
798 | static int iucv_sock_accept(struct socket *sock, struct socket *newsock, | |
cdfbabfb | 799 | int flags, bool kern) |
eac3731b JH |
800 | { |
801 | DECLARE_WAITQUEUE(wait, current); | |
802 | struct sock *sk = sock->sk, *nsk; | |
803 | long timeo; | |
804 | int err = 0; | |
805 | ||
561e0360 | 806 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
807 | |
808 | if (sk->sk_state != IUCV_LISTEN) { | |
809 | err = -EBADFD; | |
810 | goto done; | |
811 | } | |
812 | ||
813 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
814 | ||
815 | /* Wait for an incoming connection */ | |
aa395145 | 816 | add_wait_queue_exclusive(sk_sleep(sk), &wait); |
da99f056 | 817 | while (!(nsk = iucv_accept_dequeue(sk, newsock))) { |
eac3731b JH |
818 | set_current_state(TASK_INTERRUPTIBLE); |
819 | if (!timeo) { | |
820 | err = -EAGAIN; | |
821 | break; | |
822 | } | |
823 | ||
824 | release_sock(sk); | |
825 | timeo = schedule_timeout(timeo); | |
561e0360 | 826 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
eac3731b JH |
827 | |
828 | if (sk->sk_state != IUCV_LISTEN) { | |
829 | err = -EBADFD; | |
830 | break; | |
831 | } | |
832 | ||
833 | if (signal_pending(current)) { | |
834 | err = sock_intr_errno(timeo); | |
835 | break; | |
836 | } | |
837 | } | |
838 | ||
839 | set_current_state(TASK_RUNNING); | |
aa395145 | 840 | remove_wait_queue(sk_sleep(sk), &wait); |
eac3731b JH |
841 | |
842 | if (err) | |
843 | goto done; | |
844 | ||
845 | newsock->state = SS_CONNECTED; | |
846 | ||
847 | done: | |
848 | release_sock(sk); | |
849 | return err; | |
850 | } | |
851 | ||
852 | static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, | |
9b2c45d4 | 853 | int peer) |
eac3731b | 854 | { |
97f8841e | 855 | DECLARE_SOCKADDR(struct sockaddr_iucv *, siucv, addr); |
eac3731b | 856 | struct sock *sk = sock->sk; |
493d3971 | 857 | struct iucv_sock *iucv = iucv_sk(sk); |
eac3731b JH |
858 | |
859 | addr->sa_family = AF_IUCV; | |
eac3731b JH |
860 | |
861 | if (peer) { | |
493d3971 UB |
862 | memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); |
863 | memcpy(siucv->siucv_name, iucv->dst_name, 8); | |
eac3731b | 864 | } else { |
493d3971 UB |
865 | memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); |
866 | memcpy(siucv->siucv_name, iucv->src_name, 8); | |
eac3731b JH |
867 | } |
868 | memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); | |
869 | memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); | |
493d3971 | 870 | memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); |
eac3731b | 871 | |
9b2c45d4 | 872 | return sizeof(struct sockaddr_iucv); |
eac3731b JH |
873 | } |
874 | ||
b8942e3b HB |
875 | /** |
876 | * iucv_send_iprm() - Send socket data in parameter list of an iucv message. | |
877 | * @path: IUCV path | |
878 | * @msg: Pointer to a struct iucv_message | |
879 | * @skb: The socket data to send, skb->len MUST BE <= 7 | |
880 | * | |
881 | * Send the socket data in the parameter list in the iucv message | |
882 | * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter | |
883 | * list and the socket data len at index 7 (last byte). | |
884 | * See also iucv_msg_length(). | |
885 | * | |
886 | * Returns the error code from the iucv_message_send() call. | |
887 | */ | |
888 | static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, | |
889 | struct sk_buff *skb) | |
890 | { | |
891 | u8 prmdata[8]; | |
892 | ||
893 | memcpy(prmdata, (void *) skb->data, skb->len); | |
894 | prmdata[7] = 0xff - (u8) skb->len; | |
6fcd61f7 | 895 | return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, |
b8942e3b HB |
896 | (void *) prmdata, 8); |
897 | } | |
898 | ||
1b784140 YX |
899 | static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, |
900 | size_t len) | |
eac3731b JH |
901 | { |
902 | struct sock *sk = sock->sk; | |
903 | struct iucv_sock *iucv = iucv_sk(sk); | |
dc5367bc JW |
904 | size_t headroom = 0; |
905 | size_t linear; | |
eac3731b | 906 | struct sk_buff *skb; |
0506eb01 | 907 | struct iucv_message txmsg = {0}; |
44b1e6b5 HB |
908 | struct cmsghdr *cmsg; |
909 | int cmsg_done; | |
0ea920d2 | 910 | long timeo; |
8f7c502c UB |
911 | char user_id[9]; |
912 | char appl_id[9]; | |
eac3731b | 913 | int err; |
0ea920d2 | 914 | int noblock = msg->msg_flags & MSG_DONTWAIT; |
eac3731b JH |
915 | |
916 | err = sock_error(sk); | |
917 | if (err) | |
918 | return err; | |
919 | ||
920 | if (msg->msg_flags & MSG_OOB) | |
921 | return -EOPNOTSUPP; | |
922 | ||
aa8e71f5 HB |
923 | /* SOCK_SEQPACKET: we do not support segmented records */ |
924 | if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) | |
925 | return -EOPNOTSUPP; | |
926 | ||
eac3731b JH |
927 | lock_sock(sk); |
928 | ||
929 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
930 | err = -EPIPE; | |
931 | goto out; | |
932 | } | |
933 | ||
bb664f49 HB |
934 | /* Return if the socket is not in connected state */ |
935 | if (sk->sk_state != IUCV_CONNECTED) { | |
936 | err = -ENOTCONN; | |
937 | goto out; | |
938 | } | |
44b1e6b5 | 939 | |
bb664f49 HB |
940 | /* initialize defaults */ |
941 | cmsg_done = 0; /* check for duplicate headers */ | |
44b1e6b5 | 942 | |
bb664f49 | 943 | /* iterate over control messages */ |
f95b414e | 944 | for_each_cmsghdr(cmsg, msg) { |
bb664f49 HB |
945 | if (!CMSG_OK(msg, cmsg)) { |
946 | err = -EINVAL; | |
947 | goto out; | |
948 | } | |
44b1e6b5 | 949 | |
bb664f49 HB |
950 | if (cmsg->cmsg_level != SOL_IUCV) |
951 | continue; | |
44b1e6b5 | 952 | |
bb664f49 HB |
953 | if (cmsg->cmsg_type & cmsg_done) { |
954 | err = -EINVAL; | |
955 | goto out; | |
956 | } | |
957 | cmsg_done |= cmsg->cmsg_type; | |
44b1e6b5 | 958 | |
bb664f49 HB |
959 | switch (cmsg->cmsg_type) { |
960 | case SCM_IUCV_TRGCLS: | |
961 | if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { | |
44b1e6b5 HB |
962 | err = -EINVAL; |
963 | goto out; | |
964 | } | |
44b1e6b5 | 965 | |
bb664f49 HB |
966 | /* set iucv message target class */ |
967 | memcpy(&txmsg.class, | |
968 | (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); | |
44b1e6b5 | 969 | |
bb664f49 | 970 | break; |
44b1e6b5 | 971 | |
bb664f49 HB |
972 | default: |
973 | err = -EINVAL; | |
974 | goto out; | |
44b1e6b5 | 975 | } |
bb664f49 | 976 | } |
44b1e6b5 | 977 | |
bb664f49 HB |
978 | /* allocate one skb for each iucv message: |
979 | * this is fine for SOCK_SEQPACKET (unless we want to support | |
980 | * segmented records using the MSG_EOR flag), but | |
981 | * for SOCK_STREAM we might want to improve it in future */ | |
dc5367bc | 982 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
238965b7 JW |
983 | headroom = sizeof(struct af_iucv_trans_hdr) + |
984 | LL_RESERVED_SPACE(iucv->hs_dev); | |
2c3b4456 | 985 | linear = min(len, PAGE_SIZE - headroom); |
e5374399 | 986 | } else { |
dc5367bc JW |
987 | if (len < PAGE_SIZE) { |
988 | linear = len; | |
989 | } else { | |
990 | /* In nonlinear "classic" iucv skb, | |
991 | * reserve space for iucv_array | |
992 | */ | |
993 | headroom = sizeof(struct iucv_array) * | |
994 | (MAX_SKB_FRAGS + 1); | |
995 | linear = PAGE_SIZE - headroom; | |
996 | } | |
e5374399 EC |
997 | } |
998 | skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, | |
999 | noblock, &err, 0); | |
ed4ac422 | 1000 | if (!skb) |
bb664f49 | 1001 | goto out; |
e5374399 EC |
1002 | if (headroom) |
1003 | skb_reserve(skb, headroom); | |
1004 | skb_put(skb, linear); | |
1005 | skb->len = len; | |
1006 | skb->data_len = len - linear; | |
1007 | err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); | |
1008 | if (err) | |
bb664f49 | 1009 | goto fail; |
eac3731b | 1010 | |
0ea920d2 HB |
1011 | /* wait if outstanding messages for iucv path has reached */ |
1012 | timeo = sock_sndtimeo(sk, noblock); | |
1013 | err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); | |
1014 | if (err) | |
1015 | goto fail; | |
eac3731b | 1016 | |
0ea920d2 HB |
1017 | /* return -ECONNRESET if the socket is no longer connected */ |
1018 | if (sk->sk_state != IUCV_CONNECTED) { | |
1019 | err = -ECONNRESET; | |
1020 | goto fail; | |
1021 | } | |
b8942e3b | 1022 | |
bb664f49 HB |
1023 | /* increment and save iucv message tag for msg_completion cbk */ |
1024 | txmsg.tag = iucv->send_tag++; | |
f9c41a62 | 1025 | IUCV_SKB_CB(skb)->tag = txmsg.tag; |
800c5eb7 | 1026 | |
3881ac44 UB |
1027 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1028 | atomic_inc(&iucv->msg_sent); | |
1029 | err = afiucv_hs_send(&txmsg, sk, skb, 0); | |
1030 | if (err) { | |
1031 | atomic_dec(&iucv->msg_sent); | |
b2f54394 | 1032 | goto out; |
3881ac44 | 1033 | } |
e5374399 EC |
1034 | } else { /* Classic VM IUCV transport */ |
1035 | skb_queue_tail(&iucv->send_skb_q, skb); | |
ef6af7bd | 1036 | atomic_inc(&iucv->skbs_in_xmit); |
e5374399 EC |
1037 | |
1038 | if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && | |
1039 | skb->len <= 7) { | |
1040 | err = iucv_send_iprm(iucv->path, &txmsg, skb); | |
1041 | ||
1042 | /* on success: there is no message_complete callback */ | |
1043 | /* for an IPRMDATA msg; remove skb from send queue */ | |
1044 | if (err == 0) { | |
ef6af7bd | 1045 | atomic_dec(&iucv->skbs_in_xmit); |
e5374399 | 1046 | skb_unlink(skb, &iucv->send_skb_q); |
10d6393d | 1047 | consume_skb(skb); |
e5374399 | 1048 | } |
b8942e3b | 1049 | |
e5374399 EC |
1050 | /* this error should never happen since the */ |
1051 | /* IUCV_IPRMDATA path flag is set... sever path */ | |
1052 | if (err == 0x15) { | |
1053 | pr_iucv->path_sever(iucv->path, NULL); | |
ef6af7bd | 1054 | atomic_dec(&iucv->skbs_in_xmit); |
e5374399 EC |
1055 | skb_unlink(skb, &iucv->send_skb_q); |
1056 | err = -EPIPE; | |
1057 | goto fail; | |
1058 | } | |
1059 | } else if (skb_is_nonlinear(skb)) { | |
1060 | struct iucv_array *iba = (struct iucv_array *)skb->head; | |
1061 | int i; | |
1062 | ||
1063 | /* skip iucv_array lying in the headroom */ | |
1064 | iba[0].address = (u32)(addr_t)skb->data; | |
1065 | iba[0].length = (u32)skb_headlen(skb); | |
1066 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1067 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
1068 | ||
1069 | iba[i + 1].address = | |
1070 | (u32)(addr_t)skb_frag_address(frag); | |
1071 | iba[i + 1].length = (u32)skb_frag_size(frag); | |
1072 | } | |
1073 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1074 | IUCV_IPBUFLST, 0, | |
1075 | (void *)iba, skb->len); | |
1076 | } else { /* non-IPRM Linear skb */ | |
1077 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1078 | 0, 0, (void *)skb->data, skb->len); | |
bb664f49 | 1079 | } |
e5374399 EC |
1080 | if (err) { |
1081 | if (err == 3) { | |
1082 | user_id[8] = 0; | |
1083 | memcpy(user_id, iucv->dst_user_id, 8); | |
1084 | appl_id[8] = 0; | |
1085 | memcpy(appl_id, iucv->dst_name, 8); | |
1086 | pr_err( | |
1087 | "Application %s on z/VM guest %s exceeds message limit\n", | |
1088 | appl_id, user_id); | |
1089 | err = -EAGAIN; | |
1090 | } else { | |
1091 | err = -EPIPE; | |
1092 | } | |
ef6af7bd JW |
1093 | |
1094 | atomic_dec(&iucv->skbs_in_xmit); | |
eac3731b | 1095 | skb_unlink(skb, &iucv->send_skb_q); |
eac3731b JH |
1096 | goto fail; |
1097 | } | |
eac3731b JH |
1098 | } |
1099 | ||
1100 | release_sock(sk); | |
1101 | return len; | |
1102 | ||
1103 | fail: | |
1104 | kfree_skb(skb); | |
1105 | out: | |
1106 | release_sock(sk); | |
1107 | return err; | |
1108 | } | |
1109 | ||
a006353a EC |
1110 | static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) |
1111 | { | |
1112 | size_t headroom, linear; | |
1113 | struct sk_buff *skb; | |
1114 | int err; | |
1115 | ||
1116 | if (len < PAGE_SIZE) { | |
1117 | headroom = 0; | |
1118 | linear = len; | |
1119 | } else { | |
1120 | headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); | |
1121 | linear = PAGE_SIZE - headroom; | |
1122 | } | |
1123 | skb = alloc_skb_with_frags(headroom + linear, len - linear, | |
1124 | 0, &err, GFP_ATOMIC | GFP_DMA); | |
1125 | WARN_ONCE(!skb, | |
1126 | "alloc of recv iucv skb len=%lu failed with errcode=%d\n", | |
1127 | len, err); | |
1128 | if (skb) { | |
1129 | if (headroom) | |
1130 | skb_reserve(skb, headroom); | |
1131 | skb_put(skb, linear); | |
1132 | skb->len = len; | |
1133 | skb->data_len = len - linear; | |
1134 | } | |
1135 | return skb; | |
1136 | } | |
1137 | ||
bf95d20f HB |
1138 | /* iucv_process_message() - Receive a single outstanding IUCV message |
1139 | * | |
1140 | * Locking: must be called with message_q.lock held | |
1141 | */ | |
f0703c80 UB |
1142 | static void iucv_process_message(struct sock *sk, struct sk_buff *skb, |
1143 | struct iucv_path *path, | |
1144 | struct iucv_message *msg) | |
1145 | { | |
1146 | int rc; | |
b8942e3b HB |
1147 | unsigned int len; |
1148 | ||
1149 | len = iucv_msg_length(msg); | |
f0703c80 | 1150 | |
44b1e6b5 HB |
1151 | /* store msg target class in the second 4 bytes of skb ctrl buffer */ |
1152 | /* Note: the first 4 bytes are reserved for msg tag */ | |
f9c41a62 | 1153 | IUCV_SKB_CB(skb)->class = msg->class; |
44b1e6b5 | 1154 | |
b8942e3b HB |
1155 | /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ |
1156 | if ((msg->flags & IUCV_IPRMDATA) && len > 7) { | |
1157 | if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { | |
1158 | skb->data = NULL; | |
1159 | skb->len = 0; | |
1160 | } | |
f0703c80 | 1161 | } else { |
a006353a EC |
1162 | if (skb_is_nonlinear(skb)) { |
1163 | struct iucv_array *iba = (struct iucv_array *)skb->head; | |
1164 | int i; | |
1165 | ||
1166 | iba[0].address = (u32)(addr_t)skb->data; | |
1167 | iba[0].length = (u32)skb_headlen(skb); | |
1168 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1169 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
1170 | ||
1171 | iba[i + 1].address = | |
1172 | (u32)(addr_t)skb_frag_address(frag); | |
1173 | iba[i + 1].length = (u32)skb_frag_size(frag); | |
1174 | } | |
1175 | rc = pr_iucv->message_receive(path, msg, | |
1176 | IUCV_IPBUFLST, | |
1177 | (void *)iba, len, NULL); | |
1178 | } else { | |
1179 | rc = pr_iucv->message_receive(path, msg, | |
6fcd61f7 FB |
1180 | msg->flags & IUCV_IPRMDATA, |
1181 | skb->data, len, NULL); | |
a006353a | 1182 | } |
f0703c80 UB |
1183 | if (rc) { |
1184 | kfree_skb(skb); | |
1185 | return; | |
1186 | } | |
a006353a | 1187 | WARN_ON_ONCE(skb->len != len); |
f0703c80 UB |
1188 | } |
1189 | ||
f9c41a62 | 1190 | IUCV_SKB_CB(skb)->offset = 0; |
8c68b1a0 UB |
1191 | if (sk_filter(sk, skb)) { |
1192 | atomic_inc(&sk->sk_drops); /* skb rejected by filter */ | |
1193 | kfree_skb(skb); | |
1194 | return; | |
1195 | } | |
1196 | if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ | |
1197 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
f0703c80 UB |
1198 | } |
1199 | ||
bf95d20f HB |
1200 | /* iucv_process_message_q() - Process outstanding IUCV messages |
1201 | * | |
1202 | * Locking: must be called with message_q.lock held | |
1203 | */ | |
f0703c80 UB |
1204 | static void iucv_process_message_q(struct sock *sk) |
1205 | { | |
1206 | struct iucv_sock *iucv = iucv_sk(sk); | |
1207 | struct sk_buff *skb; | |
1208 | struct sock_msg_q *p, *n; | |
1209 | ||
1210 | list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { | |
a006353a | 1211 | skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); |
f0703c80 UB |
1212 | if (!skb) |
1213 | break; | |
1214 | iucv_process_message(sk, skb, p->path, &p->msg); | |
1215 | list_del(&p->list); | |
1216 | kfree(p); | |
1217 | if (!skb_queue_empty(&iucv->backlog_skb_q)) | |
1218 | break; | |
1219 | } | |
1220 | } | |
1221 | ||
1b784140 YX |
1222 | static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1223 | size_t len, int flags) | |
eac3731b JH |
1224 | { |
1225 | int noblock = flags & MSG_DONTWAIT; | |
1226 | struct sock *sk = sock->sk; | |
561e0360 | 1227 | struct iucv_sock *iucv = iucv_sk(sk); |
aa8e71f5 | 1228 | unsigned int copied, rlen; |
9fbd87d4 | 1229 | struct sk_buff *skb, *rskb, *cskb; |
eac3731b | 1230 | int err = 0; |
f9c41a62 | 1231 | u32 offset; |
eac3731b | 1232 | |
aac6399c | 1233 | if ((sk->sk_state == IUCV_DISCONN) && |
f0703c80 UB |
1234 | skb_queue_empty(&iucv->backlog_skb_q) && |
1235 | skb_queue_empty(&sk->sk_receive_queue) && | |
1236 | list_empty(&iucv->message_q.list)) | |
561e0360 JH |
1237 | return 0; |
1238 | ||
eac3731b JH |
1239 | if (flags & (MSG_OOB)) |
1240 | return -EOPNOTSUPP; | |
1241 | ||
60d3705f HB |
1242 | /* receive/dequeue next skb: |
1243 | * the function understands MSG_PEEK and, thus, does not dequeue skb */ | |
eac3731b JH |
1244 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1245 | if (!skb) { | |
1246 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1247 | return 0; | |
1248 | return err; | |
1249 | } | |
1250 | ||
f9c41a62 UB |
1251 | offset = IUCV_SKB_CB(skb)->offset; |
1252 | rlen = skb->len - offset; /* real length of skb */ | |
aa8e71f5 | 1253 | copied = min_t(unsigned int, rlen, len); |
82492a35 UB |
1254 | if (!rlen) |
1255 | sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; | |
eac3731b | 1256 | |
561e0360 | 1257 | cskb = skb; |
51f3d02b | 1258 | if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { |
802788bf HB |
1259 | if (!(flags & MSG_PEEK)) |
1260 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1261 | return -EFAULT; | |
eac3731b JH |
1262 | } |
1263 | ||
aa8e71f5 HB |
1264 | /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ |
1265 | if (sk->sk_type == SOCK_SEQPACKET) { | |
1266 | if (copied < rlen) | |
1267 | msg->msg_flags |= MSG_TRUNC; | |
1268 | /* each iucv message contains a complete record */ | |
1269 | msg->msg_flags |= MSG_EOR; | |
1270 | } | |
eac3731b | 1271 | |
44b1e6b5 HB |
1272 | /* create control message to store iucv msg target class: |
1273 | * get the trgcls from the control buffer of the skb due to | |
1274 | * fragmentation of original iucv message. */ | |
1275 | err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, | |
f9c41a62 UB |
1276 | sizeof(IUCV_SKB_CB(skb)->class), |
1277 | (void *)&IUCV_SKB_CB(skb)->class); | |
44b1e6b5 HB |
1278 | if (err) { |
1279 | if (!(flags & MSG_PEEK)) | |
1280 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1281 | return err; | |
1282 | } | |
1283 | ||
eac3731b JH |
1284 | /* Mark read part of skb as used */ |
1285 | if (!(flags & MSG_PEEK)) { | |
eac3731b | 1286 | |
aa8e71f5 HB |
1287 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ |
1288 | if (sk->sk_type == SOCK_STREAM) { | |
f9c41a62 UB |
1289 | if (copied < rlen) { |
1290 | IUCV_SKB_CB(skb)->offset = offset + copied; | |
2f139a5d | 1291 | skb_queue_head(&sk->sk_receive_queue, skb); |
aa8e71f5 HB |
1292 | goto done; |
1293 | } | |
eac3731b JH |
1294 | } |
1295 | ||
10d6393d | 1296 | consume_skb(skb); |
800c5eb7 UB |
1297 | if (iucv->transport == AF_IUCV_TRANS_HIPER) { |
1298 | atomic_inc(&iucv->msg_recv); | |
1299 | if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { | |
1300 | WARN_ON(1); | |
1301 | iucv_sock_close(sk); | |
1302 | return -EFAULT; | |
1303 | } | |
1304 | } | |
561e0360 JH |
1305 | |
1306 | /* Queue backlog skbs */ | |
bf95d20f | 1307 | spin_lock_bh(&iucv->message_q.lock); |
f0703c80 | 1308 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
da99f056 | 1309 | while (rskb) { |
f9c41a62 | 1310 | IUCV_SKB_CB(rskb)->offset = 0; |
8c68b1a0 UB |
1311 | if (__sock_queue_rcv_skb(sk, rskb)) { |
1312 | /* handle rcv queue full */ | |
f0703c80 | 1313 | skb_queue_head(&iucv->backlog_skb_q, |
561e0360 JH |
1314 | rskb); |
1315 | break; | |
561e0360 | 1316 | } |
8c68b1a0 | 1317 | rskb = skb_dequeue(&iucv->backlog_skb_q); |
561e0360 | 1318 | } |
f0703c80 | 1319 | if (skb_queue_empty(&iucv->backlog_skb_q)) { |
f0703c80 UB |
1320 | if (!list_empty(&iucv->message_q.list)) |
1321 | iucv_process_message_q(sk); | |
3881ac44 UB |
1322 | if (atomic_read(&iucv->msg_recv) >= |
1323 | iucv->msglimit / 2) { | |
9fbd87d4 | 1324 | err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); |
3881ac44 UB |
1325 | if (err) { |
1326 | sk->sk_state = IUCV_DISCONN; | |
1327 | sk->sk_state_change(sk); | |
1328 | } | |
1329 | } | |
f0703c80 | 1330 | } |
bf95d20f | 1331 | spin_unlock_bh(&iucv->message_q.lock); |
60d3705f | 1332 | } |
eac3731b JH |
1333 | |
1334 | done: | |
aa8e71f5 HB |
1335 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ |
1336 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
1337 | copied = rlen; | |
1338 | ||
1339 | return copied; | |
eac3731b JH |
1340 | } |
1341 | ||
ade994f4 | 1342 | static inline __poll_t iucv_accept_poll(struct sock *parent) |
eac3731b JH |
1343 | { |
1344 | struct iucv_sock *isk, *n; | |
1345 | struct sock *sk; | |
1346 | ||
da99f056 | 1347 | list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { |
eac3731b JH |
1348 | sk = (struct sock *) isk; |
1349 | ||
1350 | if (sk->sk_state == IUCV_CONNECTED) | |
a9a08845 | 1351 | return EPOLLIN | EPOLLRDNORM; |
eac3731b JH |
1352 | } |
1353 | ||
1354 | return 0; | |
1355 | } | |
1356 | ||
e9a36ca5 JW |
1357 | static __poll_t iucv_sock_poll(struct file *file, struct socket *sock, |
1358 | poll_table *wait) | |
eac3731b JH |
1359 | { |
1360 | struct sock *sk = sock->sk; | |
ade994f4 | 1361 | __poll_t mask = 0; |
eac3731b | 1362 | |
89ab066d | 1363 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 1364 | |
eac3731b JH |
1365 | if (sk->sk_state == IUCV_LISTEN) |
1366 | return iucv_accept_poll(sk); | |
1367 | ||
1368 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
a9a08845 LT |
1369 | mask |= EPOLLERR | |
1370 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); | |
eac3731b JH |
1371 | |
1372 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
a9a08845 | 1373 | mask |= EPOLLRDHUP; |
eac3731b JH |
1374 | |
1375 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
a9a08845 | 1376 | mask |= EPOLLHUP; |
eac3731b JH |
1377 | |
1378 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
da99f056 | 1379 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
a9a08845 | 1380 | mask |= EPOLLIN | EPOLLRDNORM; |
eac3731b JH |
1381 | |
1382 | if (sk->sk_state == IUCV_CLOSED) | |
a9a08845 | 1383 | mask |= EPOLLHUP; |
eac3731b | 1384 | |
aac6399c | 1385 | if (sk->sk_state == IUCV_DISCONN) |
a9a08845 | 1386 | mask |= EPOLLIN; |
561e0360 | 1387 | |
7f1b0ea4 | 1388 | if (sock_writeable(sk) && iucv_below_msglim(sk)) |
a9a08845 | 1389 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
eac3731b | 1390 | else |
9cd3e072 | 1391 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
eac3731b JH |
1392 | |
1393 | return mask; | |
1394 | } | |
1395 | ||
1396 | static int iucv_sock_shutdown(struct socket *sock, int how) | |
1397 | { | |
1398 | struct sock *sk = sock->sk; | |
1399 | struct iucv_sock *iucv = iucv_sk(sk); | |
1400 | struct iucv_message txmsg; | |
1401 | int err = 0; | |
eac3731b JH |
1402 | |
1403 | how++; | |
1404 | ||
1405 | if ((how & ~SHUTDOWN_MASK) || !how) | |
1406 | return -EINVAL; | |
1407 | ||
1408 | lock_sock(sk); | |
da99f056 | 1409 | switch (sk->sk_state) { |
82492a35 | 1410 | case IUCV_LISTEN: |
e14ad5fa HB |
1411 | case IUCV_DISCONN: |
1412 | case IUCV_CLOSING: | |
eac3731b JH |
1413 | case IUCV_CLOSED: |
1414 | err = -ENOTCONN; | |
1415 | goto fail; | |
eac3731b | 1416 | default: |
eac3731b JH |
1417 | break; |
1418 | } | |
1419 | ||
4031eeaf UB |
1420 | if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) && |
1421 | sk->sk_state == IUCV_CONNECTED) { | |
82492a35 UB |
1422 | if (iucv->transport == AF_IUCV_TRANS_IUCV) { |
1423 | txmsg.class = 0; | |
1424 | txmsg.tag = 0; | |
1425 | err = pr_iucv->message_send(iucv->path, &txmsg, | |
1426 | IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); | |
1427 | if (err) { | |
1428 | switch (err) { | |
1429 | case 1: | |
1430 | err = -ENOTCONN; | |
1431 | break; | |
1432 | case 2: | |
1433 | err = -ECONNRESET; | |
1434 | break; | |
1435 | default: | |
1436 | err = -ENOTCONN; | |
1437 | break; | |
1438 | } | |
eac3731b | 1439 | } |
82492a35 UB |
1440 | } else |
1441 | iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); | |
eac3731b JH |
1442 | } |
1443 | ||
82492a35 | 1444 | sk->sk_shutdown |= how; |
eac3731b | 1445 | if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { |
1042cab8 UB |
1446 | if ((iucv->transport == AF_IUCV_TRANS_IUCV) && |
1447 | iucv->path) { | |
82492a35 UB |
1448 | err = pr_iucv->path_quiesce(iucv->path, NULL); |
1449 | if (err) | |
1450 | err = -ENOTCONN; | |
1451 | /* skb_queue_purge(&sk->sk_receive_queue); */ | |
1452 | } | |
eac3731b JH |
1453 | skb_queue_purge(&sk->sk_receive_queue); |
1454 | } | |
1455 | ||
1456 | /* Wake up anyone sleeping in poll */ | |
1457 | sk->sk_state_change(sk); | |
1458 | ||
1459 | fail: | |
1460 | release_sock(sk); | |
1461 | return err; | |
1462 | } | |
1463 | ||
1464 | static int iucv_sock_release(struct socket *sock) | |
1465 | { | |
1466 | struct sock *sk = sock->sk; | |
1467 | int err = 0; | |
1468 | ||
1469 | if (!sk) | |
1470 | return 0; | |
1471 | ||
1472 | iucv_sock_close(sk); | |
1473 | ||
eac3731b JH |
1474 | sock_orphan(sk); |
1475 | iucv_sock_kill(sk); | |
1476 | return err; | |
1477 | } | |
1478 | ||
9d5c5d8f HB |
1479 | /* getsockopt and setsockopt */ |
1480 | static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, | |
a7b75c5a | 1481 | sockptr_t optval, unsigned int optlen) |
9d5c5d8f HB |
1482 | { |
1483 | struct sock *sk = sock->sk; | |
1484 | struct iucv_sock *iucv = iucv_sk(sk); | |
1485 | int val; | |
1486 | int rc; | |
1487 | ||
1488 | if (level != SOL_IUCV) | |
1489 | return -ENOPROTOOPT; | |
1490 | ||
1491 | if (optlen < sizeof(int)) | |
1492 | return -EINVAL; | |
1493 | ||
a7b75c5a | 1494 | if (copy_from_sockptr(&val, optval, sizeof(int))) |
9d5c5d8f HB |
1495 | return -EFAULT; |
1496 | ||
1497 | rc = 0; | |
1498 | ||
1499 | lock_sock(sk); | |
1500 | switch (optname) { | |
1501 | case SO_IPRMDATA_MSG: | |
1502 | if (val) | |
1503 | iucv->flags |= IUCV_IPRMDATA; | |
1504 | else | |
1505 | iucv->flags &= ~IUCV_IPRMDATA; | |
1506 | break; | |
09488e2e HB |
1507 | case SO_MSGLIMIT: |
1508 | switch (sk->sk_state) { | |
1509 | case IUCV_OPEN: | |
1510 | case IUCV_BOUND: | |
0d1c7664 | 1511 | if (val < 1 || val > U16_MAX) |
09488e2e HB |
1512 | rc = -EINVAL; |
1513 | else | |
1514 | iucv->msglimit = val; | |
1515 | break; | |
1516 | default: | |
1517 | rc = -EINVAL; | |
1518 | break; | |
1519 | } | |
1520 | break; | |
9d5c5d8f HB |
1521 | default: |
1522 | rc = -ENOPROTOOPT; | |
1523 | break; | |
1524 | } | |
1525 | release_sock(sk); | |
1526 | ||
1527 | return rc; | |
1528 | } | |
1529 | ||
1530 | static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, | |
1531 | char __user *optval, int __user *optlen) | |
1532 | { | |
1533 | struct sock *sk = sock->sk; | |
1534 | struct iucv_sock *iucv = iucv_sk(sk); | |
51363b87 UB |
1535 | unsigned int val; |
1536 | int len; | |
9d5c5d8f HB |
1537 | |
1538 | if (level != SOL_IUCV) | |
1539 | return -ENOPROTOOPT; | |
1540 | ||
1541 | if (get_user(len, optlen)) | |
1542 | return -EFAULT; | |
1543 | ||
1544 | if (len < 0) | |
1545 | return -EINVAL; | |
1546 | ||
1547 | len = min_t(unsigned int, len, sizeof(int)); | |
1548 | ||
1549 | switch (optname) { | |
1550 | case SO_IPRMDATA_MSG: | |
1551 | val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; | |
1552 | break; | |
09488e2e HB |
1553 | case SO_MSGLIMIT: |
1554 | lock_sock(sk); | |
1555 | val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ | |
1556 | : iucv->msglimit; /* default */ | |
1557 | release_sock(sk); | |
1558 | break; | |
51363b87 UB |
1559 | case SO_MSGSIZE: |
1560 | if (sk->sk_state == IUCV_OPEN) | |
1561 | return -EBADFD; | |
1562 | val = (iucv->hs_dev) ? iucv->hs_dev->mtu - | |
1563 | sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : | |
1564 | 0x7fffffff; | |
1565 | break; | |
9d5c5d8f HB |
1566 | default: |
1567 | return -ENOPROTOOPT; | |
1568 | } | |
1569 | ||
1570 | if (put_user(len, optlen)) | |
1571 | return -EFAULT; | |
1572 | if (copy_to_user(optval, &val, len)) | |
1573 | return -EFAULT; | |
1574 | ||
1575 | return 0; | |
1576 | } | |
1577 | ||
1578 | ||
eac3731b JH |
1579 | /* Callback wrappers - called from iucv base support */ |
1580 | static int iucv_callback_connreq(struct iucv_path *path, | |
1581 | u8 ipvmid[8], u8 ipuser[16]) | |
1582 | { | |
1583 | unsigned char user_data[16]; | |
1584 | unsigned char nuser_data[16]; | |
1585 | unsigned char src_name[8]; | |
eac3731b JH |
1586 | struct sock *sk, *nsk; |
1587 | struct iucv_sock *iucv, *niucv; | |
1588 | int err; | |
1589 | ||
1590 | memcpy(src_name, ipuser, 8); | |
1591 | EBCASC(src_name, 8); | |
1592 | /* Find out if this path belongs to af_iucv. */ | |
1593 | read_lock(&iucv_sk_list.lock); | |
1594 | iucv = NULL; | |
febca281 | 1595 | sk = NULL; |
b67bfe0d | 1596 | sk_for_each(sk, &iucv_sk_list.head) |
eac3731b JH |
1597 | if (sk->sk_state == IUCV_LISTEN && |
1598 | !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { | |
1599 | /* | |
1600 | * Found a listening socket with | |
1601 | * src_name == ipuser[0-7]. | |
1602 | */ | |
1603 | iucv = iucv_sk(sk); | |
1604 | break; | |
1605 | } | |
1606 | read_unlock(&iucv_sk_list.lock); | |
1607 | if (!iucv) | |
1608 | /* No socket found, not one of our paths. */ | |
1609 | return -EINVAL; | |
1610 | ||
1611 | bh_lock_sock(sk); | |
1612 | ||
1613 | /* Check if parent socket is listening */ | |
1614 | low_nmcpy(user_data, iucv->src_name); | |
1615 | high_nmcpy(user_data, iucv->dst_name); | |
1616 | ASCEBC(user_data, sizeof(user_data)); | |
1617 | if (sk->sk_state != IUCV_LISTEN) { | |
6fcd61f7 | 1618 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1619 | iucv_path_free(path); |
eac3731b JH |
1620 | goto fail; |
1621 | } | |
1622 | ||
1623 | /* Check for backlog size */ | |
1624 | if (sk_acceptq_is_full(sk)) { | |
6fcd61f7 | 1625 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1626 | iucv_path_free(path); |
eac3731b JH |
1627 | goto fail; |
1628 | } | |
1629 | ||
1630 | /* Create the new socket */ | |
c5dab094 | 1631 | nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); |
da99f056 | 1632 | if (!nsk) { |
6fcd61f7 | 1633 | err = pr_iucv->path_sever(path, user_data); |
65dbd7c2 | 1634 | iucv_path_free(path); |
eac3731b JH |
1635 | goto fail; |
1636 | } | |
1637 | ||
1638 | niucv = iucv_sk(nsk); | |
1639 | iucv_sock_init(nsk, sk); | |
fdbf6326 JW |
1640 | niucv->transport = AF_IUCV_TRANS_IUCV; |
1641 | nsk->sk_allocation |= GFP_DMA; | |
eac3731b JH |
1642 | |
1643 | /* Set the new iucv_sock */ | |
1644 | memcpy(niucv->dst_name, ipuser + 8, 8); | |
1645 | EBCASC(niucv->dst_name, 8); | |
1646 | memcpy(niucv->dst_user_id, ipvmid, 8); | |
1647 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1648 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1649 | niucv->path = path; | |
1650 | ||
1651 | /* Call iucv_accept */ | |
1652 | high_nmcpy(nuser_data, ipuser + 8); | |
1653 | memcpy(nuser_data + 8, niucv->src_name, 8); | |
1654 | ASCEBC(nuser_data + 8, 8); | |
1655 | ||
09488e2e HB |
1656 | /* set message limit for path based on msglimit of accepting socket */ |
1657 | niucv->msglimit = iucv->msglimit; | |
1658 | path->msglim = iucv->msglimit; | |
6fcd61f7 | 1659 | err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); |
da99f056 | 1660 | if (err) { |
7d316b94 | 1661 | iucv_sever_path(nsk, 1); |
65dbd7c2 | 1662 | iucv_sock_kill(nsk); |
eac3731b JH |
1663 | goto fail; |
1664 | } | |
1665 | ||
1666 | iucv_accept_enqueue(sk, nsk); | |
1667 | ||
1668 | /* Wake up accept */ | |
1669 | nsk->sk_state = IUCV_CONNECTED; | |
676d2369 | 1670 | sk->sk_data_ready(sk); |
eac3731b JH |
1671 | err = 0; |
1672 | fail: | |
1673 | bh_unlock_sock(sk); | |
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) | |
1678 | { | |
1679 | struct sock *sk = path->private; | |
1680 | ||
1681 | sk->sk_state = IUCV_CONNECTED; | |
1682 | sk->sk_state_change(sk); | |
1683 | } | |
1684 | ||
1685 | static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) | |
1686 | { | |
1687 | struct sock *sk = path->private; | |
561e0360 | 1688 | struct iucv_sock *iucv = iucv_sk(sk); |
f0703c80 UB |
1689 | struct sk_buff *skb; |
1690 | struct sock_msg_q *save_msg; | |
1691 | int len; | |
561e0360 | 1692 | |
fe86e54e | 1693 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
6fcd61f7 | 1694 | pr_iucv->message_reject(path, msg); |
eac3731b | 1695 | return; |
fe86e54e | 1696 | } |
eac3731b | 1697 | |
3fa6b5ad | 1698 | spin_lock(&iucv->message_q.lock); |
eac3731b | 1699 | |
f0703c80 UB |
1700 | if (!list_empty(&iucv->message_q.list) || |
1701 | !skb_queue_empty(&iucv->backlog_skb_q)) | |
1702 | goto save_message; | |
1703 | ||
1704 | len = atomic_read(&sk->sk_rmem_alloc); | |
87fb4b7b | 1705 | len += SKB_TRUESIZE(iucv_msg_length(msg)); |
f0703c80 UB |
1706 | if (len > sk->sk_rcvbuf) |
1707 | goto save_message; | |
1708 | ||
a006353a | 1709 | skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); |
f0703c80 UB |
1710 | if (!skb) |
1711 | goto save_message; | |
eac3731b | 1712 | |
f0703c80 | 1713 | iucv_process_message(sk, skb, path, msg); |
3fa6b5ad | 1714 | goto out_unlock; |
eac3731b | 1715 | |
f0703c80 UB |
1716 | save_message: |
1717 | save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); | |
d4444722 | 1718 | if (!save_msg) |
a56635a5 | 1719 | goto out_unlock; |
f0703c80 UB |
1720 | save_msg->path = path; |
1721 | save_msg->msg = *msg; | |
eac3731b | 1722 | |
f0703c80 | 1723 | list_add_tail(&save_msg->list, &iucv->message_q.list); |
3fa6b5ad HB |
1724 | |
1725 | out_unlock: | |
f0703c80 | 1726 | spin_unlock(&iucv->message_q.lock); |
eac3731b JH |
1727 | } |
1728 | ||
1729 | static void iucv_callback_txdone(struct iucv_path *path, | |
1730 | struct iucv_message *msg) | |
1731 | { | |
1732 | struct sock *sk = path->private; | |
f2a77991 | 1733 | struct sk_buff *this = NULL; |
ef6af7bd | 1734 | struct sk_buff_head *list; |
9e733177 | 1735 | struct sk_buff *list_skb; |
ef6af7bd | 1736 | struct iucv_sock *iucv; |
eac3731b JH |
1737 | unsigned long flags; |
1738 | ||
ef6af7bd JW |
1739 | iucv = iucv_sk(sk); |
1740 | list = &iucv->send_skb_q; | |
1741 | ||
7d316b94 | 1742 | bh_lock_sock(sk); |
561e0360 | 1743 | |
9e733177 DM |
1744 | spin_lock_irqsave(&list->lock, flags); |
1745 | skb_queue_walk(list, list_skb) { | |
1746 | if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { | |
1747 | this = list_skb; | |
1748 | break; | |
f2a77991 | 1749 | } |
9e733177 | 1750 | } |
ef6af7bd JW |
1751 | if (this) { |
1752 | atomic_dec(&iucv->skbs_in_xmit); | |
9e733177 | 1753 | __skb_unlink(this, list); |
ef6af7bd JW |
1754 | } |
1755 | ||
9e733177 | 1756 | spin_unlock_irqrestore(&list->lock, flags); |
eac3731b | 1757 | |
9e733177 | 1758 | if (this) { |
10d6393d | 1759 | consume_skb(this); |
9e733177 DM |
1760 | /* wake up any process waiting for sending */ |
1761 | iucv_sock_wake_msglim(sk); | |
561e0360 | 1762 | } |
eac3731b | 1763 | |
da99f056 | 1764 | if (sk->sk_state == IUCV_CLOSING) { |
ef6af7bd | 1765 | if (atomic_read(&iucv->skbs_in_xmit) == 0) { |
561e0360 JH |
1766 | sk->sk_state = IUCV_CLOSED; |
1767 | sk->sk_state_change(sk); | |
1768 | } | |
1769 | } | |
7d316b94 | 1770 | bh_unlock_sock(sk); |
eac3731b | 1771 | |
eac3731b JH |
1772 | } |
1773 | ||
1774 | static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) | |
1775 | { | |
1776 | struct sock *sk = path->private; | |
1777 | ||
7d316b94 UB |
1778 | if (sk->sk_state == IUCV_CLOSED) |
1779 | return; | |
1780 | ||
1781 | bh_lock_sock(sk); | |
1782 | iucv_sever_path(sk, 1); | |
aac6399c | 1783 | sk->sk_state = IUCV_DISCONN; |
eac3731b JH |
1784 | |
1785 | sk->sk_state_change(sk); | |
7d316b94 | 1786 | bh_unlock_sock(sk); |
eac3731b JH |
1787 | } |
1788 | ||
af88b52d HB |
1789 | /* called if the other communication side shuts down its RECV direction; |
1790 | * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. | |
1791 | */ | |
1792 | static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) | |
1793 | { | |
1794 | struct sock *sk = path->private; | |
1795 | ||
1796 | bh_lock_sock(sk); | |
1797 | if (sk->sk_state != IUCV_CLOSED) { | |
1798 | sk->sk_shutdown |= SEND_SHUTDOWN; | |
1799 | sk->sk_state_change(sk); | |
1800 | } | |
1801 | bh_unlock_sock(sk); | |
1802 | } | |
1803 | ||
87c272c6 JW |
1804 | static struct iucv_handler af_iucv_handler = { |
1805 | .path_pending = iucv_callback_connreq, | |
1806 | .path_complete = iucv_callback_connack, | |
1807 | .path_severed = iucv_callback_connrej, | |
1808 | .message_pending = iucv_callback_rx, | |
1809 | .message_complete = iucv_callback_txdone, | |
1810 | .path_quiesced = iucv_callback_shutdown, | |
1811 | }; | |
1812 | ||
3881ac44 UB |
1813 | /***************** HiperSockets transport callbacks ********************/ |
1814 | static void afiucv_swap_src_dest(struct sk_buff *skb) | |
1815 | { | |
cd11d112 | 1816 | struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); |
3881ac44 UB |
1817 | char tmpID[8]; |
1818 | char tmpName[8]; | |
1819 | ||
1820 | ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
1821 | ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); | |
1822 | ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
1823 | ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
1824 | memcpy(tmpID, trans_hdr->srcUserID, 8); | |
1825 | memcpy(tmpName, trans_hdr->srcAppName, 8); | |
1826 | memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); | |
1827 | memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); | |
1828 | memcpy(trans_hdr->destUserID, tmpID, 8); | |
1829 | memcpy(trans_hdr->destAppName, tmpName, 8); | |
1830 | skb_push(skb, ETH_HLEN); | |
1831 | memset(skb->data, 0, ETH_HLEN); | |
1832 | } | |
1833 | ||
1834 | /** | |
1835 | * afiucv_hs_callback_syn - react on received SYN | |
1836 | **/ | |
1837 | static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) | |
1838 | { | |
cd11d112 | 1839 | struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); |
3881ac44 UB |
1840 | struct sock *nsk; |
1841 | struct iucv_sock *iucv, *niucv; | |
3881ac44 UB |
1842 | int err; |
1843 | ||
1844 | iucv = iucv_sk(sk); | |
3881ac44 UB |
1845 | if (!iucv) { |
1846 | /* no sock - connection refused */ | |
1847 | afiucv_swap_src_dest(skb); | |
1848 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1849 | err = dev_queue_xmit(skb); | |
1850 | goto out; | |
1851 | } | |
1852 | ||
c5dab094 | 1853 | nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0); |
3881ac44 UB |
1854 | bh_lock_sock(sk); |
1855 | if ((sk->sk_state != IUCV_LISTEN) || | |
1856 | sk_acceptq_is_full(sk) || | |
1857 | !nsk) { | |
1858 | /* error on server socket - connection refused */ | |
3881ac44 UB |
1859 | afiucv_swap_src_dest(skb); |
1860 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; | |
1861 | err = dev_queue_xmit(skb); | |
4d520f62 | 1862 | iucv_sock_kill(nsk); |
3881ac44 UB |
1863 | bh_unlock_sock(sk); |
1864 | goto out; | |
1865 | } | |
1866 | ||
1867 | niucv = iucv_sk(nsk); | |
1868 | iucv_sock_init(nsk, sk); | |
1869 | niucv->transport = AF_IUCV_TRANS_HIPER; | |
1870 | niucv->msglimit = iucv->msglimit; | |
1871 | if (!trans_hdr->window) | |
1872 | niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; | |
1873 | else | |
1874 | niucv->msglimit_peer = trans_hdr->window; | |
1875 | memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); | |
1876 | memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); | |
1877 | memcpy(niucv->src_name, iucv->src_name, 8); | |
1878 | memcpy(niucv->src_user_id, iucv->src_user_id, 8); | |
1879 | nsk->sk_bound_dev_if = sk->sk_bound_dev_if; | |
800c5eb7 UB |
1880 | niucv->hs_dev = iucv->hs_dev; |
1881 | dev_hold(niucv->hs_dev); | |
3881ac44 UB |
1882 | afiucv_swap_src_dest(skb); |
1883 | trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; | |
1884 | trans_hdr->window = niucv->msglimit; | |
1885 | /* if receiver acks the xmit connection is established */ | |
1886 | err = dev_queue_xmit(skb); | |
1887 | if (!err) { | |
1888 | iucv_accept_enqueue(sk, nsk); | |
1889 | nsk->sk_state = IUCV_CONNECTED; | |
676d2369 | 1890 | sk->sk_data_ready(sk); |
3881ac44 UB |
1891 | } else |
1892 | iucv_sock_kill(nsk); | |
1893 | bh_unlock_sock(sk); | |
1894 | ||
1895 | out: | |
1896 | return NET_RX_SUCCESS; | |
1897 | } | |
1898 | ||
1899 | /** | |
1900 | * afiucv_hs_callback_synack() - react on received SYN-ACK | |
1901 | **/ | |
1902 | static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) | |
1903 | { | |
1904 | struct iucv_sock *iucv = iucv_sk(sk); | |
3881ac44 | 1905 | |
10d6393d JW |
1906 | if (!iucv || sk->sk_state != IUCV_BOUND) { |
1907 | kfree_skb(skb); | |
1908 | return NET_RX_SUCCESS; | |
1909 | } | |
1910 | ||
3881ac44 | 1911 | bh_lock_sock(sk); |
cd11d112 | 1912 | iucv->msglimit_peer = iucv_trans_hdr(skb)->window; |
3881ac44 UB |
1913 | sk->sk_state = IUCV_CONNECTED; |
1914 | sk->sk_state_change(sk); | |
1915 | bh_unlock_sock(sk); | |
10d6393d | 1916 | consume_skb(skb); |
3881ac44 UB |
1917 | return NET_RX_SUCCESS; |
1918 | } | |
1919 | ||
1920 | /** | |
1921 | * afiucv_hs_callback_synfin() - react on received SYN_FIN | |
1922 | **/ | |
1923 | static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) | |
1924 | { | |
1925 | struct iucv_sock *iucv = iucv_sk(sk); | |
1926 | ||
10d6393d JW |
1927 | if (!iucv || sk->sk_state != IUCV_BOUND) { |
1928 | kfree_skb(skb); | |
1929 | return NET_RX_SUCCESS; | |
1930 | } | |
1931 | ||
3881ac44 UB |
1932 | bh_lock_sock(sk); |
1933 | sk->sk_state = IUCV_DISCONN; | |
1934 | sk->sk_state_change(sk); | |
1935 | bh_unlock_sock(sk); | |
10d6393d | 1936 | consume_skb(skb); |
3881ac44 UB |
1937 | return NET_RX_SUCCESS; |
1938 | } | |
1939 | ||
1940 | /** | |
1941 | * afiucv_hs_callback_fin() - react on received FIN | |
1942 | **/ | |
1943 | static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) | |
1944 | { | |
1945 | struct iucv_sock *iucv = iucv_sk(sk); | |
1946 | ||
1947 | /* other end of connection closed */ | |
10d6393d JW |
1948 | if (!iucv) { |
1949 | kfree_skb(skb); | |
1950 | return NET_RX_SUCCESS; | |
1951 | } | |
1952 | ||
800c5eb7 UB |
1953 | bh_lock_sock(sk); |
1954 | if (sk->sk_state == IUCV_CONNECTED) { | |
aac6399c | 1955 | sk->sk_state = IUCV_DISCONN; |
3881ac44 | 1956 | sk->sk_state_change(sk); |
3881ac44 | 1957 | } |
800c5eb7 | 1958 | bh_unlock_sock(sk); |
10d6393d | 1959 | consume_skb(skb); |
3881ac44 UB |
1960 | return NET_RX_SUCCESS; |
1961 | } | |
1962 | ||
1963 | /** | |
1964 | * afiucv_hs_callback_win() - react on received WIN | |
1965 | **/ | |
1966 | static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) | |
1967 | { | |
1968 | struct iucv_sock *iucv = iucv_sk(sk); | |
3881ac44 UB |
1969 | |
1970 | if (!iucv) | |
1971 | return NET_RX_SUCCESS; | |
1972 | ||
1973 | if (sk->sk_state != IUCV_CONNECTED) | |
1974 | return NET_RX_SUCCESS; | |
1975 | ||
cd11d112 | 1976 | atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); |
3881ac44 UB |
1977 | iucv_sock_wake_msglim(sk); |
1978 | return NET_RX_SUCCESS; | |
1979 | } | |
1980 | ||
1981 | /** | |
1982 | * afiucv_hs_callback_rx() - react on received data | |
1983 | **/ | |
1984 | static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) | |
1985 | { | |
1986 | struct iucv_sock *iucv = iucv_sk(sk); | |
1987 | ||
1988 | if (!iucv) { | |
1989 | kfree_skb(skb); | |
1990 | return NET_RX_SUCCESS; | |
1991 | } | |
1992 | ||
1993 | if (sk->sk_state != IUCV_CONNECTED) { | |
1994 | kfree_skb(skb); | |
1995 | return NET_RX_SUCCESS; | |
1996 | } | |
1997 | ||
82492a35 UB |
1998 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
1999 | kfree_skb(skb); | |
2000 | return NET_RX_SUCCESS; | |
2001 | } | |
2002 | ||
979f66b3 | 2003 | /* write stuff from iucv_msg to skb cb */ |
3881ac44 UB |
2004 | skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); |
2005 | skb_reset_transport_header(skb); | |
2006 | skb_reset_network_header(skb); | |
f9c41a62 | 2007 | IUCV_SKB_CB(skb)->offset = 0; |
8c68b1a0 UB |
2008 | if (sk_filter(sk, skb)) { |
2009 | atomic_inc(&sk->sk_drops); /* skb rejected by filter */ | |
2010 | kfree_skb(skb); | |
2011 | return NET_RX_SUCCESS; | |
2012 | } | |
2013 | ||
3881ac44 UB |
2014 | spin_lock(&iucv->message_q.lock); |
2015 | if (skb_queue_empty(&iucv->backlog_skb_q)) { | |
8c68b1a0 | 2016 | if (__sock_queue_rcv_skb(sk, skb)) |
3881ac44 UB |
2017 | /* handle rcv queue full */ |
2018 | skb_queue_tail(&iucv->backlog_skb_q, skb); | |
3881ac44 UB |
2019 | } else |
2020 | skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); | |
2021 | spin_unlock(&iucv->message_q.lock); | |
2022 | return NET_RX_SUCCESS; | |
2023 | } | |
2024 | ||
2025 | /** | |
2026 | * afiucv_hs_rcv() - base function for arriving data through HiperSockets | |
2027 | * transport | |
2028 | * called from netif RX softirq | |
2029 | **/ | |
2030 | static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, | |
2031 | struct packet_type *pt, struct net_device *orig_dev) | |
2032 | { | |
3881ac44 UB |
2033 | struct sock *sk; |
2034 | struct iucv_sock *iucv; | |
2035 | struct af_iucv_trans_hdr *trans_hdr; | |
22244099 | 2036 | int err = NET_RX_SUCCESS; |
3881ac44 | 2037 | char nullstring[8]; |
3881ac44 | 2038 | |
cd11d112 | 2039 | if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { |
979f66b3 EC |
2040 | kfree_skb(skb); |
2041 | return NET_RX_SUCCESS; | |
2042 | } | |
cd11d112 JW |
2043 | |
2044 | trans_hdr = iucv_trans_hdr(skb); | |
3881ac44 UB |
2045 | EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); |
2046 | EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); | |
2047 | EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); | |
2048 | EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); | |
2049 | memset(nullstring, 0, sizeof(nullstring)); | |
2050 | iucv = NULL; | |
2051 | sk = NULL; | |
2052 | read_lock(&iucv_sk_list.lock); | |
b67bfe0d | 2053 | sk_for_each(sk, &iucv_sk_list.head) { |
3881ac44 UB |
2054 | if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { |
2055 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2056 | trans_hdr->destAppName, 8)) && | |
2057 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2058 | trans_hdr->destUserID, 8)) && | |
2059 | (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && | |
2060 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2061 | nullstring, 8))) { | |
2062 | iucv = iucv_sk(sk); | |
2063 | break; | |
2064 | } | |
2065 | } else { | |
2066 | if ((!memcmp(&iucv_sk(sk)->src_name, | |
2067 | trans_hdr->destAppName, 8)) && | |
2068 | (!memcmp(&iucv_sk(sk)->src_user_id, | |
2069 | trans_hdr->destUserID, 8)) && | |
2070 | (!memcmp(&iucv_sk(sk)->dst_name, | |
2071 | trans_hdr->srcAppName, 8)) && | |
2072 | (!memcmp(&iucv_sk(sk)->dst_user_id, | |
2073 | trans_hdr->srcUserID, 8))) { | |
2074 | iucv = iucv_sk(sk); | |
2075 | break; | |
2076 | } | |
2077 | } | |
2078 | } | |
2079 | read_unlock(&iucv_sk_list.lock); | |
2080 | if (!iucv) | |
2081 | sk = NULL; | |
2082 | ||
2083 | /* no sock | |
2084 | how should we send with no sock | |
2085 | 1) send without sock no send rc checking? | |
2086 | 2) introduce default sock to handle this cases | |
2087 | ||
2088 | SYN -> send SYN|ACK in good case, send SYN|FIN in bad case | |
2089 | data -> send FIN | |
2090 | SYN|ACK, SYN|FIN, FIN -> no action? */ | |
2091 | ||
2092 | switch (trans_hdr->flags) { | |
2093 | case AF_IUCV_FLAG_SYN: | |
2094 | /* connect request */ | |
2095 | err = afiucv_hs_callback_syn(sk, skb); | |
2096 | break; | |
2097 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): | |
2098 | /* connect request confirmed */ | |
2099 | err = afiucv_hs_callback_synack(sk, skb); | |
2100 | break; | |
2101 | case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): | |
2102 | /* connect request refused */ | |
2103 | err = afiucv_hs_callback_synfin(sk, skb); | |
2104 | break; | |
2105 | case (AF_IUCV_FLAG_FIN): | |
2106 | /* close request */ | |
2107 | err = afiucv_hs_callback_fin(sk, skb); | |
2108 | break; | |
2109 | case (AF_IUCV_FLAG_WIN): | |
2110 | err = afiucv_hs_callback_win(sk, skb); | |
800c5eb7 | 2111 | if (skb->len == sizeof(struct af_iucv_trans_hdr)) { |
10d6393d | 2112 | consume_skb(skb); |
800c5eb7 UB |
2113 | break; |
2114 | } | |
df561f66 | 2115 | fallthrough; /* and receive non-zero length data */ |
82492a35 UB |
2116 | case (AF_IUCV_FLAG_SHT): |
2117 | /* shutdown request */ | |
df561f66 | 2118 | fallthrough; /* and receive zero length data */ |
3881ac44 UB |
2119 | case 0: |
2120 | /* plain data frame */ | |
f9c41a62 | 2121 | IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; |
3881ac44 UB |
2122 | err = afiucv_hs_callback_rx(sk, skb); |
2123 | break; | |
2124 | default: | |
22244099 | 2125 | kfree_skb(skb); |
3881ac44 UB |
2126 | } |
2127 | ||
2128 | return err; | |
2129 | } | |
2130 | ||
2131 | /** | |
bf05d48d | 2132 | * afiucv_hs_callback_txnotify() - handle send notifications from HiperSockets |
3881ac44 UB |
2133 | * transport |
2134 | **/ | |
80bc97aa | 2135 | static void afiucv_hs_callback_txnotify(struct sock *sk, enum iucv_tx_notify n) |
3881ac44 | 2136 | { |
80bc97aa | 2137 | struct iucv_sock *iucv = iucv_sk(sk); |
3881ac44 | 2138 | |
c464444f | 2139 | if (sock_flag(sk, SOCK_ZAPPED)) |
3881ac44 UB |
2140 | return; |
2141 | ||
80bc97aa JW |
2142 | switch (n) { |
2143 | case TX_NOTIFY_OK: | |
2144 | atomic_dec(&iucv->skbs_in_xmit); | |
2145 | iucv_sock_wake_msglim(sk); | |
2146 | break; | |
2147 | case TX_NOTIFY_PENDING: | |
2148 | atomic_inc(&iucv->pendings); | |
2149 | break; | |
2150 | case TX_NOTIFY_DELAYED_OK: | |
2151 | atomic_dec(&iucv->skbs_in_xmit); | |
2152 | if (atomic_dec_return(&iucv->pendings) <= 0) | |
2153 | iucv_sock_wake_msglim(sk); | |
2154 | break; | |
2155 | default: | |
2156 | atomic_dec(&iucv->skbs_in_xmit); | |
2157 | if (sk->sk_state == IUCV_CONNECTED) { | |
2158 | sk->sk_state = IUCV_DISCONN; | |
2159 | sk->sk_state_change(sk); | |
3881ac44 | 2160 | } |
3881ac44 | 2161 | } |
3881ac44 | 2162 | |
42bd48e0 | 2163 | if (sk->sk_state == IUCV_CLOSING) { |
ef6af7bd | 2164 | if (atomic_read(&iucv->skbs_in_xmit) == 0) { |
42bd48e0 UB |
2165 | sk->sk_state = IUCV_CLOSED; |
2166 | sk->sk_state_change(sk); | |
2167 | } | |
2168 | } | |
3881ac44 | 2169 | } |
9fbd87d4 UB |
2170 | |
2171 | /* | |
2172 | * afiucv_netdev_event: handle netdev notifier chain events | |
2173 | */ | |
2174 | static int afiucv_netdev_event(struct notifier_block *this, | |
2175 | unsigned long event, void *ptr) | |
2176 | { | |
351638e7 | 2177 | struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); |
9fbd87d4 UB |
2178 | struct sock *sk; |
2179 | struct iucv_sock *iucv; | |
2180 | ||
2181 | switch (event) { | |
2182 | case NETDEV_REBOOT: | |
2183 | case NETDEV_GOING_DOWN: | |
b67bfe0d | 2184 | sk_for_each(sk, &iucv_sk_list.head) { |
9fbd87d4 UB |
2185 | iucv = iucv_sk(sk); |
2186 | if ((iucv->hs_dev == event_dev) && | |
2187 | (sk->sk_state == IUCV_CONNECTED)) { | |
2188 | if (event == NETDEV_GOING_DOWN) | |
2189 | iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); | |
2190 | sk->sk_state = IUCV_DISCONN; | |
2191 | sk->sk_state_change(sk); | |
2192 | } | |
2193 | } | |
2194 | break; | |
2195 | case NETDEV_DOWN: | |
2196 | case NETDEV_UNREGISTER: | |
2197 | default: | |
2198 | break; | |
2199 | } | |
2200 | return NOTIFY_DONE; | |
2201 | } | |
2202 | ||
2203 | static struct notifier_block afiucv_netdev_notifier = { | |
2204 | .notifier_call = afiucv_netdev_event, | |
2205 | }; | |
2206 | ||
5708e868 | 2207 | static const struct proto_ops iucv_sock_ops = { |
eac3731b JH |
2208 | .family = PF_IUCV, |
2209 | .owner = THIS_MODULE, | |
2210 | .release = iucv_sock_release, | |
2211 | .bind = iucv_sock_bind, | |
2212 | .connect = iucv_sock_connect, | |
2213 | .listen = iucv_sock_listen, | |
2214 | .accept = iucv_sock_accept, | |
2215 | .getname = iucv_sock_getname, | |
2216 | .sendmsg = iucv_sock_sendmsg, | |
2217 | .recvmsg = iucv_sock_recvmsg, | |
a11e1d43 | 2218 | .poll = iucv_sock_poll, |
eac3731b JH |
2219 | .ioctl = sock_no_ioctl, |
2220 | .mmap = sock_no_mmap, | |
2221 | .socketpair = sock_no_socketpair, | |
2222 | .shutdown = iucv_sock_shutdown, | |
9d5c5d8f HB |
2223 | .setsockopt = iucv_sock_setsockopt, |
2224 | .getsockopt = iucv_sock_getsockopt, | |
eac3731b JH |
2225 | }; |
2226 | ||
e9a36ca5 JW |
2227 | static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, |
2228 | int kern) | |
2229 | { | |
2230 | struct sock *sk; | |
2231 | ||
2232 | if (protocol && protocol != PF_IUCV) | |
2233 | return -EPROTONOSUPPORT; | |
2234 | ||
2235 | sock->state = SS_UNCONNECTED; | |
2236 | ||
2237 | switch (sock->type) { | |
2238 | case SOCK_STREAM: | |
2239 | case SOCK_SEQPACKET: | |
2240 | /* currently, proto ops can handle both sk types */ | |
2241 | sock->ops = &iucv_sock_ops; | |
2242 | break; | |
2243 | default: | |
2244 | return -ESOCKTNOSUPPORT; | |
2245 | } | |
2246 | ||
2247 | sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); | |
2248 | if (!sk) | |
2249 | return -ENOMEM; | |
2250 | ||
2251 | iucv_sock_init(sk, NULL); | |
2252 | ||
2253 | return 0; | |
2254 | } | |
2255 | ||
ec1b4cf7 | 2256 | static const struct net_proto_family iucv_sock_family_ops = { |
eac3731b JH |
2257 | .family = AF_IUCV, |
2258 | .owner = THIS_MODULE, | |
2259 | .create = iucv_sock_create, | |
2260 | }; | |
2261 | ||
3881ac44 UB |
2262 | static struct packet_type iucv_packet_type = { |
2263 | .type = cpu_to_be16(ETH_P_AF_IUCV), | |
2264 | .func = afiucv_hs_rcv, | |
2265 | }; | |
2266 | ||
da99f056 | 2267 | static int __init afiucv_init(void) |
eac3731b JH |
2268 | { |
2269 | int err; | |
2270 | ||
4eb9eda6 | 2271 | if (MACHINE_IS_VM && IS_ENABLED(CONFIG_IUCV)) { |
3881ac44 UB |
2272 | cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); |
2273 | if (unlikely(err)) { | |
2274 | WARN_ON(err); | |
2275 | err = -EPROTONOSUPPORT; | |
2276 | goto out; | |
2277 | } | |
eac3731b | 2278 | |
4eb9eda6 | 2279 | pr_iucv = &iucv_if; |
3881ac44 UB |
2280 | } else { |
2281 | memset(&iucv_userid, 0, sizeof(iucv_userid)); | |
2282 | pr_iucv = NULL; | |
6fcd61f7 FB |
2283 | } |
2284 | ||
eac3731b JH |
2285 | err = proto_register(&iucv_proto, 0); |
2286 | if (err) | |
6fcd61f7 | 2287 | goto out; |
eac3731b JH |
2288 | err = sock_register(&iucv_sock_family_ops); |
2289 | if (err) | |
2290 | goto out_proto; | |
6fcd61f7 | 2291 | |
3881ac44 | 2292 | if (pr_iucv) { |
ff8424be | 2293 | err = pr_iucv->iucv_register(&af_iucv_handler, 0); |
3881ac44 UB |
2294 | if (err) |
2295 | goto out_sock; | |
06996c1d JW |
2296 | } |
2297 | ||
2298 | err = register_netdevice_notifier(&afiucv_netdev_notifier); | |
2299 | if (err) | |
2300 | goto out_notifier; | |
2301 | ||
3881ac44 | 2302 | dev_add_pack(&iucv_packet_type); |
eac3731b JH |
2303 | return 0; |
2304 | ||
06996c1d JW |
2305 | out_notifier: |
2306 | if (pr_iucv) | |
ff8424be | 2307 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); |
c23cad92 UB |
2308 | out_sock: |
2309 | sock_unregister(PF_IUCV); | |
eac3731b JH |
2310 | out_proto: |
2311 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2312 | out: |
2313 | return err; | |
2314 | } | |
2315 | ||
2316 | static void __exit afiucv_exit(void) | |
2317 | { | |
4eb9eda6 | 2318 | if (pr_iucv) |
ff8424be | 2319 | pr_iucv->iucv_unregister(&af_iucv_handler, 0); |
06996c1d JW |
2320 | |
2321 | unregister_netdevice_notifier(&afiucv_netdev_notifier); | |
3881ac44 | 2322 | dev_remove_pack(&iucv_packet_type); |
eac3731b JH |
2323 | sock_unregister(PF_IUCV); |
2324 | proto_unregister(&iucv_proto); | |
eac3731b JH |
2325 | } |
2326 | ||
2327 | module_init(afiucv_init); | |
2328 | module_exit(afiucv_exit); | |
2329 | ||
2330 | MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); | |
2331 | MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); | |
2332 | MODULE_VERSION(VERSION); | |
2333 | MODULE_LICENSE("GPL"); | |
2334 | MODULE_ALIAS_NETPROTO(PF_IUCV); |