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17926a79 DH |
1 | /* RxRPC packet transmission |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/net.h> | |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
17926a79 DH |
14 | #include <linux/skbuff.h> |
15 | #include <linux/circ_buf.h> | |
16 | #include <net/sock.h> | |
17 | #include <net/af_rxrpc.h> | |
18 | #include "ar-internal.h" | |
19 | ||
20 | int rxrpc_resend_timeout = 4; | |
21 | ||
22 | static int rxrpc_send_data(struct kiocb *iocb, | |
23 | struct rxrpc_sock *rx, | |
24 | struct rxrpc_call *call, | |
25 | struct msghdr *msg, size_t len); | |
26 | ||
27 | /* | |
28 | * extract control messages from the sendmsg() control buffer | |
29 | */ | |
30 | static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, struct msghdr *msg, | |
31 | unsigned long *user_call_ID, | |
32 | enum rxrpc_command *command, | |
33 | u32 *abort_code, | |
34 | bool server) | |
35 | { | |
36 | struct cmsghdr *cmsg; | |
37 | int len; | |
38 | ||
39 | *command = RXRPC_CMD_SEND_DATA; | |
40 | ||
41 | if (msg->msg_controllen == 0) | |
42 | return -EINVAL; | |
43 | ||
44 | for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { | |
45 | if (!CMSG_OK(msg, cmsg)) | |
46 | return -EINVAL; | |
47 | ||
48 | len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); | |
49 | _debug("CMSG %d, %d, %d", | |
50 | cmsg->cmsg_level, cmsg->cmsg_type, len); | |
51 | ||
52 | if (cmsg->cmsg_level != SOL_RXRPC) | |
53 | continue; | |
54 | ||
55 | switch (cmsg->cmsg_type) { | |
56 | case RXRPC_USER_CALL_ID: | |
57 | if (msg->msg_flags & MSG_CMSG_COMPAT) { | |
58 | if (len != sizeof(u32)) | |
59 | return -EINVAL; | |
60 | *user_call_ID = *(u32 *) CMSG_DATA(cmsg); | |
61 | } else { | |
62 | if (len != sizeof(unsigned long)) | |
63 | return -EINVAL; | |
64 | *user_call_ID = *(unsigned long *) | |
65 | CMSG_DATA(cmsg); | |
66 | } | |
67 | _debug("User Call ID %lx", *user_call_ID); | |
68 | break; | |
69 | ||
70 | case RXRPC_ABORT: | |
71 | if (*command != RXRPC_CMD_SEND_DATA) | |
72 | return -EINVAL; | |
73 | *command = RXRPC_CMD_SEND_ABORT; | |
74 | if (len != sizeof(*abort_code)) | |
75 | return -EINVAL; | |
76 | *abort_code = *(unsigned int *) CMSG_DATA(cmsg); | |
77 | _debug("Abort %x", *abort_code); | |
78 | if (*abort_code == 0) | |
79 | return -EINVAL; | |
80 | break; | |
81 | ||
82 | case RXRPC_ACCEPT: | |
83 | if (*command != RXRPC_CMD_SEND_DATA) | |
84 | return -EINVAL; | |
85 | *command = RXRPC_CMD_ACCEPT; | |
86 | if (len != 0) | |
87 | return -EINVAL; | |
88 | if (!server) | |
89 | return -EISCONN; | |
90 | break; | |
91 | ||
92 | default: | |
93 | return -EINVAL; | |
94 | } | |
95 | } | |
96 | ||
97 | _leave(" = 0"); | |
98 | return 0; | |
99 | } | |
100 | ||
101 | /* | |
102 | * abort a call, sending an ABORT packet to the peer | |
103 | */ | |
104 | static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code) | |
105 | { | |
106 | write_lock_bh(&call->state_lock); | |
107 | ||
108 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
109 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
110 | call->abort_code = abort_code; | |
111 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
112 | del_timer_sync(&call->resend_timer); | |
113 | del_timer_sync(&call->ack_timer); | |
114 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
115 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
116 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
651350d1 | 117 | rxrpc_queue_call(call); |
17926a79 DH |
118 | } |
119 | ||
120 | write_unlock_bh(&call->state_lock); | |
121 | } | |
122 | ||
123 | /* | |
124 | * send a message forming part of a client call through an RxRPC socket | |
125 | * - caller holds the socket locked | |
126 | * - the socket may be either a client socket or a server socket | |
127 | */ | |
128 | int rxrpc_client_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx, | |
129 | struct rxrpc_transport *trans, struct msghdr *msg, | |
130 | size_t len) | |
131 | { | |
132 | struct rxrpc_conn_bundle *bundle; | |
133 | enum rxrpc_command cmd; | |
134 | struct rxrpc_call *call; | |
135 | unsigned long user_call_ID = 0; | |
136 | struct key *key; | |
137 | __be16 service_id; | |
138 | u32 abort_code = 0; | |
139 | int ret; | |
140 | ||
141 | _enter(""); | |
142 | ||
143 | ASSERT(trans != NULL); | |
144 | ||
145 | ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code, | |
146 | false); | |
147 | if (ret < 0) | |
148 | return ret; | |
149 | ||
150 | bundle = NULL; | |
151 | if (trans) { | |
152 | service_id = rx->service_id; | |
153 | if (msg->msg_name) { | |
154 | struct sockaddr_rxrpc *srx = | |
155 | (struct sockaddr_rxrpc *) msg->msg_name; | |
156 | service_id = htons(srx->srx_service); | |
157 | } | |
158 | key = rx->key; | |
159 | if (key && !rx->key->payload.data) | |
160 | key = NULL; | |
161 | bundle = rxrpc_get_bundle(rx, trans, key, service_id, | |
162 | GFP_KERNEL); | |
163 | if (IS_ERR(bundle)) | |
164 | return PTR_ERR(bundle); | |
165 | } | |
166 | ||
167 | call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, | |
168 | abort_code == 0, GFP_KERNEL); | |
169 | if (trans) | |
170 | rxrpc_put_bundle(trans, bundle); | |
171 | if (IS_ERR(call)) { | |
172 | _leave(" = %ld", PTR_ERR(call)); | |
173 | return PTR_ERR(call); | |
174 | } | |
175 | ||
176 | _debug("CALL %d USR %lx ST %d on CONN %p", | |
177 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
178 | ||
179 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
180 | /* it's too late for this call */ | |
181 | ret = -ESHUTDOWN; | |
182 | } else if (cmd == RXRPC_CMD_SEND_ABORT) { | |
183 | rxrpc_send_abort(call, abort_code); | |
184 | } else if (cmd != RXRPC_CMD_SEND_DATA) { | |
185 | ret = -EINVAL; | |
186 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) { | |
187 | /* request phase complete for this client call */ | |
188 | ret = -EPROTO; | |
189 | } else { | |
190 | ret = rxrpc_send_data(iocb, rx, call, msg, len); | |
191 | } | |
192 | ||
193 | rxrpc_put_call(call); | |
194 | _leave(" = %d", ret); | |
195 | return ret; | |
196 | } | |
197 | ||
651350d1 DH |
198 | /** |
199 | * rxrpc_kernel_send_data - Allow a kernel service to send data on a call | |
200 | * @call: The call to send data through | |
201 | * @msg: The data to send | |
202 | * @len: The amount of data to send | |
203 | * | |
204 | * Allow a kernel service to send data on a call. The call must be in an state | |
205 | * appropriate to sending data. No control data should be supplied in @msg, | |
206 | * nor should an address be supplied. MSG_MORE should be flagged if there's | |
207 | * more data to come, otherwise this data will end the transmission phase. | |
208 | */ | |
209 | int rxrpc_kernel_send_data(struct rxrpc_call *call, struct msghdr *msg, | |
210 | size_t len) | |
211 | { | |
212 | int ret; | |
213 | ||
214 | _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); | |
215 | ||
216 | ASSERTCMP(msg->msg_name, ==, NULL); | |
217 | ASSERTCMP(msg->msg_control, ==, NULL); | |
218 | ||
219 | lock_sock(&call->socket->sk); | |
220 | ||
221 | _debug("CALL %d USR %lx ST %d on CONN %p", | |
222 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
223 | ||
224 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
225 | ret = -ESHUTDOWN; /* it's too late for this call */ | |
226 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
227 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
228 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
229 | ret = -EPROTO; /* request phase complete for this client call */ | |
230 | } else { | |
231 | mm_segment_t oldfs = get_fs(); | |
232 | set_fs(KERNEL_DS); | |
233 | ret = rxrpc_send_data(NULL, call->socket, call, msg, len); | |
234 | set_fs(oldfs); | |
235 | } | |
236 | ||
237 | release_sock(&call->socket->sk); | |
238 | _leave(" = %d", ret); | |
239 | return ret; | |
240 | } | |
241 | ||
242 | EXPORT_SYMBOL(rxrpc_kernel_send_data); | |
243 | ||
244 | /* | |
245 | * rxrpc_kernel_abort_call - Allow a kernel service to abort a call | |
246 | * @call: The call to be aborted | |
247 | * @abort_code: The abort code to stick into the ABORT packet | |
248 | * | |
249 | * Allow a kernel service to abort a call, if it's still in an abortable state. | |
250 | */ | |
251 | void rxrpc_kernel_abort_call(struct rxrpc_call *call, u32 abort_code) | |
252 | { | |
253 | _enter("{%d},%d", call->debug_id, abort_code); | |
254 | ||
255 | lock_sock(&call->socket->sk); | |
256 | ||
257 | _debug("CALL %d USR %lx ST %d on CONN %p", | |
258 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
259 | ||
260 | if (call->state < RXRPC_CALL_COMPLETE) | |
261 | rxrpc_send_abort(call, abort_code); | |
262 | ||
263 | release_sock(&call->socket->sk); | |
264 | _leave(""); | |
265 | } | |
266 | ||
267 | EXPORT_SYMBOL(rxrpc_kernel_abort_call); | |
268 | ||
17926a79 DH |
269 | /* |
270 | * send a message through a server socket | |
271 | * - caller holds the socket locked | |
272 | */ | |
273 | int rxrpc_server_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx, | |
274 | struct msghdr *msg, size_t len) | |
275 | { | |
276 | enum rxrpc_command cmd; | |
277 | struct rxrpc_call *call; | |
278 | unsigned long user_call_ID = 0; | |
279 | u32 abort_code = 0; | |
280 | int ret; | |
281 | ||
282 | _enter(""); | |
283 | ||
284 | ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code, | |
285 | true); | |
286 | if (ret < 0) | |
287 | return ret; | |
288 | ||
651350d1 DH |
289 | if (cmd == RXRPC_CMD_ACCEPT) { |
290 | call = rxrpc_accept_call(rx, user_call_ID); | |
291 | if (IS_ERR(call)) | |
292 | return PTR_ERR(call); | |
293 | rxrpc_put_call(call); | |
294 | return 0; | |
295 | } | |
17926a79 DH |
296 | |
297 | call = rxrpc_find_server_call(rx, user_call_ID); | |
298 | if (!call) | |
299 | return -EBADSLT; | |
300 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
301 | ret = -ESHUTDOWN; | |
302 | goto out; | |
303 | } | |
304 | ||
305 | switch (cmd) { | |
306 | case RXRPC_CMD_SEND_DATA: | |
307 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
308 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
309 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
310 | /* Tx phase not yet begun for this call */ | |
311 | ret = -EPROTO; | |
312 | break; | |
313 | } | |
314 | ||
315 | ret = rxrpc_send_data(iocb, rx, call, msg, len); | |
316 | break; | |
317 | ||
318 | case RXRPC_CMD_SEND_ABORT: | |
319 | rxrpc_send_abort(call, abort_code); | |
320 | break; | |
321 | default: | |
322 | BUG(); | |
323 | } | |
324 | ||
325 | out: | |
326 | rxrpc_put_call(call); | |
327 | _leave(" = %d", ret); | |
328 | return ret; | |
329 | } | |
330 | ||
331 | /* | |
332 | * send a packet through the transport endpoint | |
333 | */ | |
334 | int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb) | |
335 | { | |
336 | struct kvec iov[1]; | |
337 | struct msghdr msg; | |
338 | int ret, opt; | |
339 | ||
340 | _enter(",{%d}", skb->len); | |
341 | ||
342 | iov[0].iov_base = skb->head; | |
343 | iov[0].iov_len = skb->len; | |
344 | ||
345 | msg.msg_name = &trans->peer->srx.transport.sin; | |
346 | msg.msg_namelen = sizeof(trans->peer->srx.transport.sin); | |
347 | msg.msg_control = NULL; | |
348 | msg.msg_controllen = 0; | |
349 | msg.msg_flags = 0; | |
350 | ||
351 | /* send the packet with the don't fragment bit set if we currently | |
352 | * think it's small enough */ | |
353 | if (skb->len - sizeof(struct rxrpc_header) < trans->peer->maxdata) { | |
354 | down_read(&trans->local->defrag_sem); | |
355 | /* send the packet by UDP | |
356 | * - returns -EMSGSIZE if UDP would have to fragment the packet | |
357 | * to go out of the interface | |
358 | * - in which case, we'll have processed the ICMP error | |
359 | * message and update the peer record | |
360 | */ | |
361 | ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1, | |
362 | iov[0].iov_len); | |
363 | ||
364 | up_read(&trans->local->defrag_sem); | |
365 | if (ret == -EMSGSIZE) | |
366 | goto send_fragmentable; | |
367 | ||
368 | _leave(" = %d [%u]", ret, trans->peer->maxdata); | |
369 | return ret; | |
370 | } | |
371 | ||
372 | send_fragmentable: | |
373 | /* attempt to send this message with fragmentation enabled */ | |
374 | _debug("send fragment"); | |
375 | ||
376 | down_write(&trans->local->defrag_sem); | |
377 | opt = IP_PMTUDISC_DONT; | |
378 | ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER, | |
379 | (char *) &opt, sizeof(opt)); | |
380 | if (ret == 0) { | |
381 | ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1, | |
382 | iov[0].iov_len); | |
383 | ||
384 | opt = IP_PMTUDISC_DO; | |
385 | kernel_setsockopt(trans->local->socket, SOL_IP, | |
386 | IP_MTU_DISCOVER, (char *) &opt, sizeof(opt)); | |
387 | } | |
388 | ||
389 | up_write(&trans->local->defrag_sem); | |
390 | _leave(" = %d [frag %u]", ret, trans->peer->maxdata); | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* | |
395 | * wait for space to appear in the transmit/ACK window | |
396 | * - caller holds the socket locked | |
397 | */ | |
398 | static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, | |
399 | struct rxrpc_call *call, | |
400 | long *timeo) | |
401 | { | |
402 | DECLARE_WAITQUEUE(myself, current); | |
403 | int ret; | |
404 | ||
405 | _enter(",{%d},%ld", | |
406 | CIRC_SPACE(call->acks_head, call->acks_tail, call->acks_winsz), | |
407 | *timeo); | |
408 | ||
409 | add_wait_queue(&call->tx_waitq, &myself); | |
410 | ||
411 | for (;;) { | |
412 | set_current_state(TASK_INTERRUPTIBLE); | |
413 | ret = 0; | |
414 | if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
415 | call->acks_winsz) > 0) | |
416 | break; | |
417 | if (signal_pending(current)) { | |
418 | ret = sock_intr_errno(*timeo); | |
419 | break; | |
420 | } | |
421 | ||
422 | release_sock(&rx->sk); | |
423 | *timeo = schedule_timeout(*timeo); | |
424 | lock_sock(&rx->sk); | |
425 | } | |
426 | ||
427 | remove_wait_queue(&call->tx_waitq, &myself); | |
428 | set_current_state(TASK_RUNNING); | |
429 | _leave(" = %d", ret); | |
430 | return ret; | |
431 | } | |
432 | ||
433 | /* | |
434 | * attempt to schedule an instant Tx resend | |
435 | */ | |
436 | static inline void rxrpc_instant_resend(struct rxrpc_call *call) | |
437 | { | |
438 | read_lock_bh(&call->state_lock); | |
439 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
440 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
441 | if (call->state < RXRPC_CALL_COMPLETE && | |
442 | !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
651350d1 | 443 | rxrpc_queue_call(call); |
17926a79 DH |
444 | } |
445 | read_unlock_bh(&call->state_lock); | |
446 | } | |
447 | ||
448 | /* | |
449 | * queue a packet for transmission, set the resend timer and attempt | |
450 | * to send the packet immediately | |
451 | */ | |
452 | static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb, | |
453 | bool last) | |
454 | { | |
455 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
456 | int ret; | |
457 | ||
458 | _net("queue skb %p [%d]", skb, call->acks_head); | |
459 | ||
460 | ASSERT(call->acks_window != NULL); | |
461 | call->acks_window[call->acks_head] = (unsigned long) skb; | |
462 | smp_wmb(); | |
463 | call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1); | |
464 | ||
465 | if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { | |
466 | _debug("________awaiting reply/ACK__________"); | |
467 | write_lock_bh(&call->state_lock); | |
468 | switch (call->state) { | |
469 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
470 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
471 | break; | |
472 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
473 | call->state = RXRPC_CALL_SERVER_SEND_REPLY; | |
474 | if (!last) | |
475 | break; | |
476 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
477 | call->state = RXRPC_CALL_SERVER_AWAIT_ACK; | |
478 | break; | |
479 | default: | |
480 | break; | |
481 | } | |
482 | write_unlock_bh(&call->state_lock); | |
483 | } | |
484 | ||
485 | _proto("Tx DATA %%%u { #%u }", | |
486 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
487 | ||
488 | sp->need_resend = 0; | |
489 | sp->resend_at = jiffies + rxrpc_resend_timeout * HZ; | |
490 | if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) { | |
491 | _debug("run timer"); | |
492 | call->resend_timer.expires = sp->resend_at; | |
493 | add_timer(&call->resend_timer); | |
494 | } | |
495 | ||
496 | /* attempt to cancel the rx-ACK timer, deferring reply transmission if | |
497 | * we're ACK'ing the request phase of an incoming call */ | |
498 | ret = -EAGAIN; | |
499 | if (try_to_del_timer_sync(&call->ack_timer) >= 0) { | |
500 | /* the packet may be freed by rxrpc_process_call() before this | |
501 | * returns */ | |
502 | ret = rxrpc_send_packet(call->conn->trans, skb); | |
503 | _net("sent skb %p", skb); | |
504 | } else { | |
505 | _debug("failed to delete ACK timer"); | |
506 | } | |
507 | ||
508 | if (ret < 0) { | |
509 | _debug("need instant resend %d", ret); | |
510 | sp->need_resend = 1; | |
511 | rxrpc_instant_resend(call); | |
512 | } | |
513 | ||
514 | _leave(""); | |
515 | } | |
516 | ||
517 | /* | |
518 | * send data through a socket | |
519 | * - must be called in process context | |
520 | * - caller holds the socket locked | |
521 | */ | |
522 | static int rxrpc_send_data(struct kiocb *iocb, | |
523 | struct rxrpc_sock *rx, | |
524 | struct rxrpc_call *call, | |
525 | struct msghdr *msg, size_t len) | |
526 | { | |
527 | struct rxrpc_skb_priv *sp; | |
528 | unsigned char __user *from; | |
529 | struct sk_buff *skb; | |
530 | struct iovec *iov; | |
531 | struct sock *sk = &rx->sk; | |
532 | long timeo; | |
533 | bool more; | |
534 | int ret, ioc, segment, copied; | |
535 | ||
536 | _enter(",,,{%zu},%zu", msg->msg_iovlen, len); | |
537 | ||
538 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
539 | ||
540 | /* this should be in poll */ | |
541 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
542 | ||
543 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
544 | return -EPIPE; | |
545 | ||
546 | iov = msg->msg_iov; | |
547 | ioc = msg->msg_iovlen - 1; | |
548 | from = iov->iov_base; | |
549 | segment = iov->iov_len; | |
550 | iov++; | |
551 | more = msg->msg_flags & MSG_MORE; | |
552 | ||
553 | skb = call->tx_pending; | |
554 | call->tx_pending = NULL; | |
555 | ||
556 | copied = 0; | |
557 | do { | |
558 | int copy; | |
559 | ||
560 | if (segment > len) | |
561 | segment = len; | |
562 | ||
563 | _debug("SEGMENT %d @%p", segment, from); | |
564 | ||
565 | if (!skb) { | |
566 | size_t size, chunk, max, space; | |
567 | ||
568 | _debug("alloc"); | |
569 | ||
570 | if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
571 | call->acks_winsz) <= 0) { | |
572 | ret = -EAGAIN; | |
573 | if (msg->msg_flags & MSG_DONTWAIT) | |
574 | goto maybe_error; | |
575 | ret = rxrpc_wait_for_tx_window(rx, call, | |
576 | &timeo); | |
577 | if (ret < 0) | |
578 | goto maybe_error; | |
579 | } | |
580 | ||
581 | max = call->conn->trans->peer->maxdata; | |
582 | max -= call->conn->security_size; | |
583 | max &= ~(call->conn->size_align - 1UL); | |
584 | ||
585 | chunk = max; | |
224711df | 586 | if (chunk > len && !more) |
17926a79 DH |
587 | chunk = len; |
588 | ||
589 | space = chunk + call->conn->size_align; | |
590 | space &= ~(call->conn->size_align - 1UL); | |
591 | ||
592 | size = space + call->conn->header_size; | |
593 | ||
594 | _debug("SIZE: %zu/%zu/%zu", chunk, space, size); | |
595 | ||
596 | /* create a buffer that we can retain until it's ACK'd */ | |
597 | skb = sock_alloc_send_skb( | |
598 | sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); | |
599 | if (!skb) | |
600 | goto maybe_error; | |
601 | ||
602 | rxrpc_new_skb(skb); | |
603 | ||
604 | _debug("ALLOC SEND %p", skb); | |
605 | ||
606 | ASSERTCMP(skb->mark, ==, 0); | |
607 | ||
608 | _debug("HS: %u", call->conn->header_size); | |
609 | skb_reserve(skb, call->conn->header_size); | |
610 | skb->len += call->conn->header_size; | |
611 | ||
612 | sp = rxrpc_skb(skb); | |
613 | sp->remain = chunk; | |
614 | if (sp->remain > skb_tailroom(skb)) | |
615 | sp->remain = skb_tailroom(skb); | |
616 | ||
617 | _net("skb: hr %d, tr %d, hl %d, rm %d", | |
618 | skb_headroom(skb), | |
619 | skb_tailroom(skb), | |
620 | skb_headlen(skb), | |
621 | sp->remain); | |
622 | ||
623 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
624 | } | |
625 | ||
626 | _debug("append"); | |
627 | sp = rxrpc_skb(skb); | |
628 | ||
629 | /* append next segment of data to the current buffer */ | |
630 | copy = skb_tailroom(skb); | |
631 | ASSERTCMP(copy, >, 0); | |
632 | if (copy > segment) | |
633 | copy = segment; | |
634 | if (copy > sp->remain) | |
635 | copy = sp->remain; | |
636 | ||
637 | _debug("add"); | |
638 | ret = skb_add_data(skb, from, copy); | |
639 | _debug("added"); | |
640 | if (ret < 0) | |
641 | goto efault; | |
642 | sp->remain -= copy; | |
643 | skb->mark += copy; | |
19e6454c | 644 | copied += copy; |
17926a79 DH |
645 | |
646 | len -= copy; | |
647 | segment -= copy; | |
648 | from += copy; | |
649 | while (segment == 0 && ioc > 0) { | |
650 | from = iov->iov_base; | |
651 | segment = iov->iov_len; | |
652 | iov++; | |
653 | ioc--; | |
654 | } | |
655 | if (len == 0) { | |
656 | segment = 0; | |
657 | ioc = 0; | |
658 | } | |
659 | ||
660 | /* check for the far side aborting the call or a network error | |
661 | * occurring */ | |
662 | if (call->state > RXRPC_CALL_COMPLETE) | |
663 | goto call_aborted; | |
664 | ||
665 | /* add the packet to the send queue if it's now full */ | |
666 | if (sp->remain <= 0 || (segment == 0 && !more)) { | |
667 | struct rxrpc_connection *conn = call->conn; | |
668 | size_t pad; | |
669 | ||
670 | /* pad out if we're using security */ | |
671 | if (conn->security) { | |
672 | pad = conn->security_size + skb->mark; | |
673 | pad = conn->size_align - pad; | |
674 | pad &= conn->size_align - 1; | |
675 | _debug("pad %zu", pad); | |
676 | if (pad) | |
677 | memset(skb_put(skb, pad), 0, pad); | |
678 | } | |
679 | ||
680 | sp->hdr.epoch = conn->epoch; | |
681 | sp->hdr.cid = call->cid; | |
682 | sp->hdr.callNumber = call->call_id; | |
683 | sp->hdr.seq = | |
684 | htonl(atomic_inc_return(&call->sequence)); | |
685 | sp->hdr.serial = | |
686 | htonl(atomic_inc_return(&conn->serial)); | |
687 | sp->hdr.type = RXRPC_PACKET_TYPE_DATA; | |
688 | sp->hdr.userStatus = 0; | |
689 | sp->hdr.securityIndex = conn->security_ix; | |
690 | sp->hdr._rsvd = 0; | |
691 | sp->hdr.serviceId = conn->service_id; | |
692 | ||
693 | sp->hdr.flags = conn->out_clientflag; | |
694 | if (len == 0 && !more) | |
695 | sp->hdr.flags |= RXRPC_LAST_PACKET; | |
696 | else if (CIRC_SPACE(call->acks_head, call->acks_tail, | |
697 | call->acks_winsz) > 1) | |
698 | sp->hdr.flags |= RXRPC_MORE_PACKETS; | |
699 | ||
700 | ret = rxrpc_secure_packet( | |
701 | call, skb, skb->mark, | |
702 | skb->head + sizeof(struct rxrpc_header)); | |
703 | if (ret < 0) | |
704 | goto out; | |
705 | ||
706 | memcpy(skb->head, &sp->hdr, | |
707 | sizeof(struct rxrpc_header)); | |
708 | rxrpc_queue_packet(call, skb, segment == 0 && !more); | |
709 | skb = NULL; | |
710 | } | |
711 | ||
712 | } while (segment > 0); | |
713 | ||
19e6454c DH |
714 | success: |
715 | ret = copied; | |
17926a79 DH |
716 | out: |
717 | call->tx_pending = skb; | |
718 | _leave(" = %d", ret); | |
719 | return ret; | |
720 | ||
721 | call_aborted: | |
722 | rxrpc_free_skb(skb); | |
723 | if (call->state == RXRPC_CALL_NETWORK_ERROR) | |
724 | ret = call->conn->trans->peer->net_error; | |
725 | else | |
726 | ret = -ECONNABORTED; | |
727 | _leave(" = %d", ret); | |
728 | return ret; | |
729 | ||
730 | maybe_error: | |
731 | if (copied) | |
19e6454c | 732 | goto success; |
17926a79 DH |
733 | goto out; |
734 | ||
735 | efault: | |
736 | ret = -EFAULT; | |
737 | goto out; | |
738 | } |