Commit | Line | Data |
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0b58b8a1 DH |
1 | /* AF_RXRPC sendmsg() implementation. |
2 | * | |
3 | * Copyright (C) 2007, 2016 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 Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
13 | ||
14 | #include <linux/net.h> | |
15 | #include <linux/gfp.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/export.h> | |
0b58b8a1 DH |
18 | #include <net/sock.h> |
19 | #include <net/af_rxrpc.h> | |
20 | #include "ar-internal.h" | |
21 | ||
3dc20f09 DH |
22 | enum rxrpc_command { |
23 | RXRPC_CMD_SEND_DATA, /* send data message */ | |
24 | RXRPC_CMD_SEND_ABORT, /* request abort generation */ | |
25 | RXRPC_CMD_ACCEPT, /* [server] accept incoming call */ | |
26 | RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ | |
27 | }; | |
28 | ||
0b58b8a1 | 29 | /* |
df423a4a DH |
30 | * wait for space to appear in the transmit/ACK window |
31 | * - caller holds the socket locked | |
0b58b8a1 | 32 | */ |
df423a4a DH |
33 | static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, |
34 | struct rxrpc_call *call, | |
35 | long *timeo) | |
0b58b8a1 | 36 | { |
df423a4a DH |
37 | DECLARE_WAITQUEUE(myself, current); |
38 | int ret; | |
0b58b8a1 | 39 | |
248f219c DH |
40 | _enter(",{%u,%u,%u}", |
41 | call->tx_hard_ack, call->tx_top, call->tx_winsize); | |
0b58b8a1 | 42 | |
df423a4a | 43 | add_wait_queue(&call->waitq, &myself); |
0b58b8a1 | 44 | |
df423a4a DH |
45 | for (;;) { |
46 | set_current_state(TASK_INTERRUPTIBLE); | |
47 | ret = 0; | |
57494343 DH |
48 | if (call->tx_top - call->tx_hard_ack < |
49 | min_t(unsigned int, call->tx_winsize, | |
50 | call->cong_cwnd + call->cong_extra)) | |
0b58b8a1 | 51 | break; |
248f219c DH |
52 | if (call->state >= RXRPC_CALL_COMPLETE) { |
53 | ret = -call->error; | |
54 | break; | |
55 | } | |
df423a4a DH |
56 | if (signal_pending(current)) { |
57 | ret = sock_intr_errno(*timeo); | |
0b58b8a1 | 58 | break; |
0b58b8a1 | 59 | } |
df423a4a | 60 | |
a124fe3e | 61 | trace_rxrpc_transmit(call, rxrpc_transmit_wait); |
df423a4a DH |
62 | release_sock(&rx->sk); |
63 | *timeo = schedule_timeout(*timeo); | |
64 | lock_sock(&rx->sk); | |
0b58b8a1 DH |
65 | } |
66 | ||
df423a4a DH |
67 | remove_wait_queue(&call->waitq, &myself); |
68 | set_current_state(TASK_RUNNING); | |
69 | _leave(" = %d", ret); | |
70 | return ret; | |
0b58b8a1 DH |
71 | } |
72 | ||
73 | /* | |
248f219c | 74 | * Schedule an instant Tx resend. |
0b58b8a1 | 75 | */ |
248f219c | 76 | static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix) |
0b58b8a1 | 77 | { |
248f219c DH |
78 | spin_lock_bh(&call->lock); |
79 | ||
80 | if (call->state < RXRPC_CALL_COMPLETE) { | |
81 | call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS; | |
82 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
df423a4a | 83 | rxrpc_queue_call(call); |
0b58b8a1 | 84 | } |
248f219c DH |
85 | |
86 | spin_unlock_bh(&call->lock); | |
0b58b8a1 DH |
87 | } |
88 | ||
89 | /* | |
248f219c DH |
90 | * Queue a DATA packet for transmission, set the resend timeout and send the |
91 | * packet immediately | |
0b58b8a1 | 92 | */ |
df423a4a DH |
93 | static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb, |
94 | bool last) | |
0b58b8a1 | 95 | { |
df423a4a | 96 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c DH |
97 | rxrpc_seq_t seq = sp->hdr.seq; |
98 | int ret, ix; | |
70790dbe | 99 | u8 annotation = RXRPC_TX_ANNO_UNACK; |
248f219c DH |
100 | |
101 | _net("queue skb %p [%d]", skb, seq); | |
0b58b8a1 | 102 | |
248f219c | 103 | ASSERTCMP(seq, ==, call->tx_top + 1); |
0b58b8a1 | 104 | |
70790dbe DH |
105 | if (last) |
106 | annotation |= RXRPC_TX_ANNO_LAST; | |
107 | ||
b24d2891 DH |
108 | /* We have to set the timestamp before queueing as the retransmit |
109 | * algorithm can see the packet as soon as we queue it. | |
110 | */ | |
111 | skb->tstamp = ktime_get_real(); | |
112 | ||
248f219c | 113 | ix = seq & RXRPC_RXTX_BUFF_MASK; |
71f3ca40 | 114 | rxrpc_get_skb(skb, rxrpc_skb_tx_got); |
70790dbe | 115 | call->rxtx_annotations[ix] = annotation; |
df423a4a | 116 | smp_wmb(); |
248f219c DH |
117 | call->rxtx_buffer[ix] = skb; |
118 | call->tx_top = seq; | |
70790dbe | 119 | if (last) |
a124fe3e | 120 | trace_rxrpc_transmit(call, rxrpc_transmit_queue_last); |
70790dbe | 121 | else |
a124fe3e | 122 | trace_rxrpc_transmit(call, rxrpc_transmit_queue); |
0b58b8a1 | 123 | |
df423a4a DH |
124 | if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { |
125 | _debug("________awaiting reply/ACK__________"); | |
126 | write_lock_bh(&call->state_lock); | |
127 | switch (call->state) { | |
128 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
129 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
130 | break; | |
131 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
132 | call->state = RXRPC_CALL_SERVER_SEND_REPLY; | |
9749fd2b DH |
133 | call->ack_at = call->expire_at; |
134 | if (call->ackr_reason == RXRPC_ACK_DELAY) | |
135 | call->ackr_reason = 0; | |
136 | __rxrpc_set_timer(call, rxrpc_timer_init_for_send_reply, | |
137 | ktime_get_real()); | |
df423a4a DH |
138 | if (!last) |
139 | break; | |
140 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
141 | call->state = RXRPC_CALL_SERVER_AWAIT_ACK; | |
142 | break; | |
143 | default: | |
144 | break; | |
145 | } | |
146 | write_unlock_bh(&call->state_lock); | |
147 | } | |
0b58b8a1 | 148 | |
248f219c DH |
149 | if (seq == 1 && rxrpc_is_client_call(call)) |
150 | rxrpc_expose_client_call(call); | |
df423a4a | 151 | |
a1767077 | 152 | ret = rxrpc_send_data_packet(call, skb, false); |
df423a4a DH |
153 | if (ret < 0) { |
154 | _debug("need instant resend %d", ret); | |
248f219c | 155 | rxrpc_instant_resend(call, ix); |
dfc3da44 | 156 | } else { |
df0adc78 | 157 | ktime_t now = ktime_get_real(), resend_at; |
dfc3da44 | 158 | |
df0adc78 | 159 | resend_at = ktime_add_ms(now, rxrpc_resend_timeout); |
dfc3da44 | 160 | |
df0adc78 | 161 | if (ktime_before(resend_at, call->resend_at)) { |
dfc3da44 | 162 | call->resend_at = resend_at; |
df0adc78 | 163 | rxrpc_set_timer(call, rxrpc_timer_set_for_send, now); |
dfc3da44 | 164 | } |
df423a4a DH |
165 | } |
166 | ||
71f3ca40 | 167 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
df423a4a | 168 | _leave(""); |
0b58b8a1 DH |
169 | } |
170 | ||
df423a4a DH |
171 | /* |
172 | * send data through a socket | |
173 | * - must be called in process context | |
0b58b8a1 | 174 | * - caller holds the socket locked |
0b58b8a1 | 175 | */ |
df423a4a DH |
176 | static int rxrpc_send_data(struct rxrpc_sock *rx, |
177 | struct rxrpc_call *call, | |
178 | struct msghdr *msg, size_t len) | |
0b58b8a1 | 179 | { |
df423a4a DH |
180 | struct rxrpc_skb_priv *sp; |
181 | struct sk_buff *skb; | |
182 | struct sock *sk = &rx->sk; | |
183 | long timeo; | |
184 | bool more; | |
185 | int ret, copied; | |
0b58b8a1 | 186 | |
df423a4a | 187 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
0b58b8a1 | 188 | |
df423a4a DH |
189 | /* this should be in poll */ |
190 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
0b58b8a1 | 191 | |
df423a4a DH |
192 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
193 | return -EPIPE; | |
0b58b8a1 | 194 | |
df423a4a | 195 | more = msg->msg_flags & MSG_MORE; |
0b58b8a1 | 196 | |
df423a4a DH |
197 | skb = call->tx_pending; |
198 | call->tx_pending = NULL; | |
71f3ca40 | 199 | rxrpc_see_skb(skb, rxrpc_skb_tx_seen); |
0b58b8a1 | 200 | |
df423a4a DH |
201 | copied = 0; |
202 | do { | |
7aa51da7 DH |
203 | /* Check to see if there's a ping ACK to reply to. */ |
204 | if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE) | |
a5af7e1f | 205 | rxrpc_send_ack_packet(call, false); |
7aa51da7 | 206 | |
df423a4a DH |
207 | if (!skb) { |
208 | size_t size, chunk, max, space; | |
0b58b8a1 | 209 | |
df423a4a | 210 | _debug("alloc"); |
0b58b8a1 | 211 | |
248f219c | 212 | if (call->tx_top - call->tx_hard_ack >= |
57494343 DH |
213 | min_t(unsigned int, call->tx_winsize, |
214 | call->cong_cwnd + call->cong_extra)) { | |
df423a4a DH |
215 | ret = -EAGAIN; |
216 | if (msg->msg_flags & MSG_DONTWAIT) | |
217 | goto maybe_error; | |
218 | ret = rxrpc_wait_for_tx_window(rx, call, | |
219 | &timeo); | |
220 | if (ret < 0) | |
221 | goto maybe_error; | |
222 | } | |
0b58b8a1 | 223 | |
182f5056 | 224 | max = RXRPC_JUMBO_DATALEN; |
df423a4a DH |
225 | max -= call->conn->security_size; |
226 | max &= ~(call->conn->size_align - 1UL); | |
0b58b8a1 | 227 | |
df423a4a DH |
228 | chunk = max; |
229 | if (chunk > msg_data_left(msg) && !more) | |
230 | chunk = msg_data_left(msg); | |
0b58b8a1 | 231 | |
df423a4a DH |
232 | space = chunk + call->conn->size_align; |
233 | space &= ~(call->conn->size_align - 1UL); | |
0b58b8a1 | 234 | |
5a924b89 | 235 | size = space + call->conn->security_size; |
0b58b8a1 | 236 | |
df423a4a | 237 | _debug("SIZE: %zu/%zu/%zu", chunk, space, size); |
0b58b8a1 | 238 | |
df423a4a DH |
239 | /* create a buffer that we can retain until it's ACK'd */ |
240 | skb = sock_alloc_send_skb( | |
241 | sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); | |
242 | if (!skb) | |
243 | goto maybe_error; | |
0b58b8a1 | 244 | |
71f3ca40 | 245 | rxrpc_new_skb(skb, rxrpc_skb_tx_new); |
0b58b8a1 | 246 | |
df423a4a | 247 | _debug("ALLOC SEND %p", skb); |
0b58b8a1 | 248 | |
df423a4a | 249 | ASSERTCMP(skb->mark, ==, 0); |
0b58b8a1 | 250 | |
5a924b89 DH |
251 | _debug("HS: %u", call->conn->security_size); |
252 | skb_reserve(skb, call->conn->security_size); | |
253 | skb->len += call->conn->security_size; | |
0b58b8a1 | 254 | |
df423a4a DH |
255 | sp = rxrpc_skb(skb); |
256 | sp->remain = chunk; | |
257 | if (sp->remain > skb_tailroom(skb)) | |
258 | sp->remain = skb_tailroom(skb); | |
0b58b8a1 | 259 | |
df423a4a DH |
260 | _net("skb: hr %d, tr %d, hl %d, rm %d", |
261 | skb_headroom(skb), | |
262 | skb_tailroom(skb), | |
263 | skb_headlen(skb), | |
264 | sp->remain); | |
0b58b8a1 | 265 | |
df423a4a DH |
266 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
267 | } | |
0b58b8a1 | 268 | |
df423a4a DH |
269 | _debug("append"); |
270 | sp = rxrpc_skb(skb); | |
0b58b8a1 | 271 | |
df423a4a DH |
272 | /* append next segment of data to the current buffer */ |
273 | if (msg_data_left(msg) > 0) { | |
274 | int copy = skb_tailroom(skb); | |
275 | ASSERTCMP(copy, >, 0); | |
276 | if (copy > msg_data_left(msg)) | |
277 | copy = msg_data_left(msg); | |
278 | if (copy > sp->remain) | |
279 | copy = sp->remain; | |
0b58b8a1 | 280 | |
df423a4a DH |
281 | _debug("add"); |
282 | ret = skb_add_data(skb, &msg->msg_iter, copy); | |
283 | _debug("added"); | |
284 | if (ret < 0) | |
285 | goto efault; | |
286 | sp->remain -= copy; | |
287 | skb->mark += copy; | |
288 | copied += copy; | |
0b58b8a1 DH |
289 | } |
290 | ||
df423a4a DH |
291 | /* check for the far side aborting the call or a network error |
292 | * occurring */ | |
293 | if (call->state == RXRPC_CALL_COMPLETE) | |
294 | goto call_terminated; | |
0b58b8a1 | 295 | |
df423a4a DH |
296 | /* add the packet to the send queue if it's now full */ |
297 | if (sp->remain <= 0 || | |
298 | (msg_data_left(msg) == 0 && !more)) { | |
299 | struct rxrpc_connection *conn = call->conn; | |
300 | uint32_t seq; | |
301 | size_t pad; | |
0b58b8a1 | 302 | |
df423a4a DH |
303 | /* pad out if we're using security */ |
304 | if (conn->security_ix) { | |
305 | pad = conn->security_size + skb->mark; | |
306 | pad = conn->size_align - pad; | |
307 | pad &= conn->size_align - 1; | |
308 | _debug("pad %zu", pad); | |
309 | if (pad) | |
310 | memset(skb_put(skb, pad), 0, pad); | |
311 | } | |
0b58b8a1 | 312 | |
248f219c | 313 | seq = call->tx_top + 1; |
0b58b8a1 | 314 | |
df423a4a | 315 | sp->hdr.seq = seq; |
df423a4a | 316 | sp->hdr._rsvd = 0; |
5a924b89 | 317 | sp->hdr.flags = conn->out_clientflag; |
0b58b8a1 | 318 | |
df423a4a DH |
319 | if (msg_data_left(msg) == 0 && !more) |
320 | sp->hdr.flags |= RXRPC_LAST_PACKET; | |
248f219c DH |
321 | else if (call->tx_top - call->tx_hard_ack < |
322 | call->tx_winsize) | |
df423a4a | 323 | sp->hdr.flags |= RXRPC_MORE_PACKETS; |
0b58b8a1 | 324 | |
df423a4a | 325 | ret = conn->security->secure_packet( |
5a924b89 | 326 | call, skb, skb->mark, skb->head); |
df423a4a DH |
327 | if (ret < 0) |
328 | goto out; | |
0b58b8a1 | 329 | |
df423a4a DH |
330 | rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more); |
331 | skb = NULL; | |
332 | } | |
333 | } while (msg_data_left(msg) > 0); | |
0b58b8a1 | 334 | |
df423a4a DH |
335 | success: |
336 | ret = copied; | |
337 | out: | |
338 | call->tx_pending = skb; | |
339 | _leave(" = %d", ret); | |
340 | return ret; | |
0b58b8a1 | 341 | |
df423a4a | 342 | call_terminated: |
71f3ca40 | 343 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
df423a4a | 344 | _leave(" = %d", -call->error); |
248f219c | 345 | return -call->error; |
0b58b8a1 | 346 | |
df423a4a DH |
347 | maybe_error: |
348 | if (copied) | |
349 | goto success; | |
350 | goto out; | |
0b58b8a1 | 351 | |
df423a4a DH |
352 | efault: |
353 | ret = -EFAULT; | |
354 | goto out; | |
0b58b8a1 DH |
355 | } |
356 | ||
357 | /* | |
df423a4a | 358 | * extract control messages from the sendmsg() control buffer |
0b58b8a1 | 359 | */ |
df423a4a DH |
360 | static int rxrpc_sendmsg_cmsg(struct msghdr *msg, |
361 | unsigned long *user_call_ID, | |
362 | enum rxrpc_command *command, | |
363 | u32 *abort_code, | |
364 | bool *_exclusive) | |
0b58b8a1 | 365 | { |
df423a4a DH |
366 | struct cmsghdr *cmsg; |
367 | bool got_user_ID = false; | |
368 | int len; | |
0b58b8a1 | 369 | |
df423a4a | 370 | *command = RXRPC_CMD_SEND_DATA; |
0b58b8a1 | 371 | |
df423a4a DH |
372 | if (msg->msg_controllen == 0) |
373 | return -EINVAL; | |
0b58b8a1 | 374 | |
df423a4a DH |
375 | for_each_cmsghdr(cmsg, msg) { |
376 | if (!CMSG_OK(msg, cmsg)) | |
377 | return -EINVAL; | |
0b58b8a1 | 378 | |
df423a4a DH |
379 | len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); |
380 | _debug("CMSG %d, %d, %d", | |
381 | cmsg->cmsg_level, cmsg->cmsg_type, len); | |
0b58b8a1 | 382 | |
df423a4a DH |
383 | if (cmsg->cmsg_level != SOL_RXRPC) |
384 | continue; | |
0b58b8a1 | 385 | |
df423a4a DH |
386 | switch (cmsg->cmsg_type) { |
387 | case RXRPC_USER_CALL_ID: | |
388 | if (msg->msg_flags & MSG_CMSG_COMPAT) { | |
389 | if (len != sizeof(u32)) | |
390 | return -EINVAL; | |
391 | *user_call_ID = *(u32 *) CMSG_DATA(cmsg); | |
392 | } else { | |
393 | if (len != sizeof(unsigned long)) | |
394 | return -EINVAL; | |
395 | *user_call_ID = *(unsigned long *) | |
396 | CMSG_DATA(cmsg); | |
397 | } | |
398 | _debug("User Call ID %lx", *user_call_ID); | |
399 | got_user_ID = true; | |
400 | break; | |
0b58b8a1 | 401 | |
df423a4a DH |
402 | case RXRPC_ABORT: |
403 | if (*command != RXRPC_CMD_SEND_DATA) | |
404 | return -EINVAL; | |
405 | *command = RXRPC_CMD_SEND_ABORT; | |
406 | if (len != sizeof(*abort_code)) | |
407 | return -EINVAL; | |
408 | *abort_code = *(unsigned int *) CMSG_DATA(cmsg); | |
409 | _debug("Abort %x", *abort_code); | |
410 | if (*abort_code == 0) | |
411 | return -EINVAL; | |
412 | break; | |
0b58b8a1 | 413 | |
df423a4a DH |
414 | case RXRPC_ACCEPT: |
415 | if (*command != RXRPC_CMD_SEND_DATA) | |
416 | return -EINVAL; | |
417 | *command = RXRPC_CMD_ACCEPT; | |
418 | if (len != 0) | |
419 | return -EINVAL; | |
420 | break; | |
0b58b8a1 | 421 | |
df423a4a DH |
422 | case RXRPC_EXCLUSIVE_CALL: |
423 | *_exclusive = true; | |
424 | if (len != 0) | |
425 | return -EINVAL; | |
426 | break; | |
427 | default: | |
428 | return -EINVAL; | |
429 | } | |
430 | } | |
0b58b8a1 | 431 | |
df423a4a DH |
432 | if (!got_user_ID) |
433 | return -EINVAL; | |
434 | _leave(" = 0"); | |
435 | return 0; | |
436 | } | |
0b58b8a1 | 437 | |
df423a4a DH |
438 | /* |
439 | * Create a new client call for sendmsg(). | |
440 | */ | |
441 | static struct rxrpc_call * | |
442 | rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, | |
443 | unsigned long user_call_ID, bool exclusive) | |
444 | { | |
445 | struct rxrpc_conn_parameters cp; | |
446 | struct rxrpc_call *call; | |
447 | struct key *key; | |
0b58b8a1 | 448 | |
df423a4a | 449 | DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name); |
0b58b8a1 | 450 | |
df423a4a | 451 | _enter(""); |
0b58b8a1 | 452 | |
df423a4a DH |
453 | if (!msg->msg_name) |
454 | return ERR_PTR(-EDESTADDRREQ); | |
0b58b8a1 | 455 | |
df423a4a DH |
456 | key = rx->key; |
457 | if (key && !rx->key->payload.data[0]) | |
458 | key = NULL; | |
0b58b8a1 | 459 | |
df423a4a DH |
460 | memset(&cp, 0, sizeof(cp)); |
461 | cp.local = rx->local; | |
462 | cp.key = rx->key; | |
463 | cp.security_level = rx->min_sec_level; | |
464 | cp.exclusive = rx->exclusive | exclusive; | |
465 | cp.service_id = srx->srx_service; | |
466 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL); | |
0b58b8a1 | 467 | |
df423a4a DH |
468 | _leave(" = %p\n", call); |
469 | return call; | |
470 | } | |
0b58b8a1 | 471 | |
df423a4a DH |
472 | /* |
473 | * send a message forming part of a client call through an RxRPC socket | |
474 | * - caller holds the socket locked | |
475 | * - the socket may be either a client socket or a server socket | |
476 | */ | |
477 | int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len) | |
478 | { | |
479 | enum rxrpc_command cmd; | |
480 | struct rxrpc_call *call; | |
481 | unsigned long user_call_ID = 0; | |
482 | bool exclusive = false; | |
483 | u32 abort_code = 0; | |
484 | int ret; | |
0b58b8a1 | 485 | |
df423a4a | 486 | _enter(""); |
0b58b8a1 | 487 | |
df423a4a DH |
488 | ret = rxrpc_sendmsg_cmsg(msg, &user_call_ID, &cmd, &abort_code, |
489 | &exclusive); | |
490 | if (ret < 0) | |
491 | return ret; | |
0b58b8a1 | 492 | |
df423a4a DH |
493 | if (cmd == RXRPC_CMD_ACCEPT) { |
494 | if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) | |
495 | return -EINVAL; | |
496 | call = rxrpc_accept_call(rx, user_call_ID, NULL); | |
497 | if (IS_ERR(call)) | |
498 | return PTR_ERR(call); | |
fff72429 | 499 | rxrpc_put_call(call, rxrpc_call_put); |
df423a4a DH |
500 | return 0; |
501 | } | |
0b58b8a1 | 502 | |
df423a4a DH |
503 | call = rxrpc_find_call_by_user_ID(rx, user_call_ID); |
504 | if (!call) { | |
505 | if (cmd != RXRPC_CMD_SEND_DATA) | |
506 | return -EBADSLT; | |
507 | call = rxrpc_new_client_call_for_sendmsg(rx, msg, user_call_ID, | |
508 | exclusive); | |
509 | if (IS_ERR(call)) | |
510 | return PTR_ERR(call); | |
511 | } | |
0b58b8a1 | 512 | |
df423a4a DH |
513 | _debug("CALL %d USR %lx ST %d on CONN %p", |
514 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
0b58b8a1 | 515 | |
df423a4a DH |
516 | if (call->state >= RXRPC_CALL_COMPLETE) { |
517 | /* it's too late for this call */ | |
518 | ret = -ESHUTDOWN; | |
519 | } else if (cmd == RXRPC_CMD_SEND_ABORT) { | |
df423a4a | 520 | ret = 0; |
248f219c | 521 | if (rxrpc_abort_call("CMD", call, 0, abort_code, ECONNABORTED)) |
26cb02aa | 522 | ret = rxrpc_send_abort_packet(call); |
df423a4a DH |
523 | } else if (cmd != RXRPC_CMD_SEND_DATA) { |
524 | ret = -EINVAL; | |
525 | } else if (rxrpc_is_client_call(call) && | |
526 | call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) { | |
527 | /* request phase complete for this client call */ | |
528 | ret = -EPROTO; | |
529 | } else if (rxrpc_is_service_call(call) && | |
530 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
531 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
532 | /* Reply phase not begun or not complete for service call. */ | |
533 | ret = -EPROTO; | |
534 | } else { | |
535 | ret = rxrpc_send_data(rx, call, msg, len); | |
536 | } | |
0b58b8a1 | 537 | |
fff72429 | 538 | rxrpc_put_call(call, rxrpc_call_put); |
df423a4a DH |
539 | _leave(" = %d", ret); |
540 | return ret; | |
541 | } | |
0b58b8a1 | 542 | |
df423a4a DH |
543 | /** |
544 | * rxrpc_kernel_send_data - Allow a kernel service to send data on a call | |
545 | * @sock: The socket the call is on | |
546 | * @call: The call to send data through | |
547 | * @msg: The data to send | |
548 | * @len: The amount of data to send | |
549 | * | |
550 | * Allow a kernel service to send data on a call. The call must be in an state | |
551 | * appropriate to sending data. No control data should be supplied in @msg, | |
552 | * nor should an address be supplied. MSG_MORE should be flagged if there's | |
553 | * more data to come, otherwise this data will end the transmission phase. | |
554 | */ | |
555 | int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call, | |
556 | struct msghdr *msg, size_t len) | |
557 | { | |
558 | int ret; | |
0b58b8a1 | 559 | |
df423a4a | 560 | _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); |
0b58b8a1 | 561 | |
df423a4a DH |
562 | ASSERTCMP(msg->msg_name, ==, NULL); |
563 | ASSERTCMP(msg->msg_control, ==, NULL); | |
0b58b8a1 | 564 | |
df423a4a | 565 | lock_sock(sock->sk); |
0b58b8a1 | 566 | |
df423a4a DH |
567 | _debug("CALL %d USR %lx ST %d on CONN %p", |
568 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
0b58b8a1 | 569 | |
df423a4a DH |
570 | if (call->state >= RXRPC_CALL_COMPLETE) { |
571 | ret = -ESHUTDOWN; /* it's too late for this call */ | |
572 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
573 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
574 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
575 | ret = -EPROTO; /* request phase complete for this client call */ | |
576 | } else { | |
577 | ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len); | |
578 | } | |
579 | ||
580 | release_sock(sock->sk); | |
0b58b8a1 DH |
581 | _leave(" = %d", ret); |
582 | return ret; | |
df423a4a DH |
583 | } |
584 | EXPORT_SYMBOL(rxrpc_kernel_send_data); | |
0b58b8a1 | 585 | |
df423a4a DH |
586 | /** |
587 | * rxrpc_kernel_abort_call - Allow a kernel service to abort a call | |
588 | * @sock: The socket the call is on | |
589 | * @call: The call to be aborted | |
590 | * @abort_code: The abort code to stick into the ABORT packet | |
5a42976d DH |
591 | * @error: Local error value |
592 | * @why: 3-char string indicating why. | |
df423a4a DH |
593 | * |
594 | * Allow a kernel service to abort a call, if it's still in an abortable state. | |
595 | */ | |
596 | void rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call, | |
5a42976d | 597 | u32 abort_code, int error, const char *why) |
df423a4a | 598 | { |
5a42976d | 599 | _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why); |
0b58b8a1 | 600 | |
df423a4a | 601 | lock_sock(sock->sk); |
0b58b8a1 | 602 | |
248f219c | 603 | if (rxrpc_abort_call(why, call, 0, abort_code, error)) |
26cb02aa | 604 | rxrpc_send_abort_packet(call); |
df423a4a DH |
605 | |
606 | release_sock(sock->sk); | |
607 | _leave(""); | |
0b58b8a1 | 608 | } |
df423a4a DH |
609 | |
610 | EXPORT_SYMBOL(rxrpc_kernel_abort_call); |